GMW3399 2006 04 (Multiphase Ultra High Strength Sheet Steel)

WORLDWIDE ENGINEERING STANDARDS

Material Specification Metals

GMW3399

Multi Phase and Ultra High Strength Sheet Steel

Copyright 2006 General Motors Corporation All Rights Reserved

April 2006 Originating Department: North American Engineering Standards Page 1 of 14

1 Scope This specification covers the requirements for continuous cast, hot rolled or cold rolled sheet steel with specified tensile strengths from 390 MPa through 1500 MPa. Typical applications include body panels, body structure members, chassis components and bumpers. 1.1 Material Description. The specification applies to uncoated and coated, dual phase (ferrite + martensite) (DP), dual phase with high hole expansion (ferrite + bainite) (FB), transformation induced plasticity (ferrite + bainite + retained austenite) (TRIP, or TR), multi-phase (ferrite + martensite + bainite + precipitation hardening) (MP) or martensitic (MS) materials. The CR550 grade has been removed from GMW3032 and is now covered by this specification as GMW3399M-ST-S CR690T/550Y DP. These steels also have a specified minimum yield strength, but the applications in which these steels are used are not typically yield strength dependent, therefore this is not the major classification criterion. These products shall be supplied as coils or sheet. Hot rolled flat products are usually supplied in thicknesses greater than 1.80 mm. Cold rolled flat products with the appropriate surface type and surface finish are suitable for the application of

surface coatings (metallic hot dipping, electrolytic plating, hot spray painting, organic coatings and/or other coatings). This specification does not apply to steel for case hardening and cold reduced, work hardened strips. Additional requirements or agreements have to be specified by local business units. [e.g., North America (NA), Europe (E), Latin America (LA), and Asia Pacific (AP)]. 1.2 Material Identification. The GMW base metal specification number defines the material designation, steel product type, grade, and finish type. The steel product type is CR for cold rolled products, or HR for hot rolled products. For example, the grade description 590T/340Y designates the minimum tensile strength/minimum yield strength in megapascals (MPa). A designation of steel type (i.e. DP, TR, FB, MP or MS) shall be added. The steel grades will correspond to the chemical and mechanical requirements as shown in Tables 1 through 8. The finish type, an alpha character, will designate the finish as E (exposed), Z (semi-exposed) or U (unexposed). The above descriptive items are used together to form the coding system. Examples of the coding system for engineering part drawings and manufacturing engineering documents are shown in paragraph 8.

1.2.1 Material Identification. Duel Phase (DP) GM WORLDWIDE NORTH AMERICA EUROPE LATIN AMERICA ASIA PACIFIC

1.2.2 Material Identification. Transformation Induced Plasticity Steels (TR) GM WORLDWIDE NORTH AMERICA EUROPE LATIN AMERICA ASIA PACIFIC

1.2.3 Material Identification. Martensitic Steels (MS) GM WORLDWIDE NORTH AMERICA EUROPE LATIN AMERICA ASIA PACIFIC

GM6123M

Copyright GM Worldwide Provided by IHS under license with GMW Licensee=Visteon Corp/5962532002

Not for Resale, 07/13/2007 01:09:15 MDTNo reproduction or networking permitted without license from IHS

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GMW3399 GM WORLDWIDE ENGINEERING STANDARDS


Page 2 of 14 April 2006

1.2.4 Material Identification. Multi-phase Steels (MP) GM WORLDWIDE NORTH AMERICA EUROPE LATIN AMERICA ASIA PACIFIC

1.3 Symbols. Not applicable. 1.4 Typical Applications. Typical applications are sheet metal parts consisting of coated and uncoated high strength sheet steel with specified minimum tensile strengths from 450 MPa through 1500 MPa.

2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. AS 1391 JFS A 1001 ASTM A751 JIS B 0610 ASTM E45 JIS B 0651 ASTM E112 JIS Z 2201 ISO 6892 QS9000 ISO 10275 ISO TC 164 ISO 11014-1 2.2 GM Standards/Specifications. 9984001 GMW8 B 040 1270 GMW11 B 040 1271 GMW3011 EMS.9310015 GMW3059 EMS.ME.1508 GMW3224 GM6123M GMW3335 GM6180M HN 1623 GM9769P HN 1643 GME 8689 HN 1673 GME 00007 OPEL 105 2.3 Additional References. Iron and Steel Society Steel Products Manual-Sheet Steel EN10 049 European Procedure for testing surface roughness of sheet metal Agreement to EN 10048 between VDA and Walzstahl-Vereinigung (Committee of German Steel Mills). Material Identification. Martensitic Steels (MS), North America GM6123M.

3 Requirements The following section defines specific requirements for material on delivery, processing, performance and other stages during life cycle. Deviations required for individual GM business units are listed in Appendix A. Grades under development are shown in Appendix B. 3.1 Requirements on Delivery. 3.1.1 Chemical Requirements. 3.1.1.1 Base Metal. Base metal composition based on product (ladle, coil or sheet/blanks) analysis determined per ASTM A751 shall conform to the general requirements of Table 1 and the grade specific requirements in Table 2 (if applicable) and/or shall be agreed upon between supplier and purchaser. Additional demands and restrictions may be imposed by local Materials Engineering organizations depending on the application. 3.1.1.2 Surface Treatment. Products must be coated with a designated lubricant approved by the local business unit. See Appendix A. 3.1.2 Mechanical Requirements. The steel products shall meet the mechanical properties as specified in Tables 3-10. The 0.2% Offset Yield Strength, Tensile Strength and Percent Total Elongation shall be determined in the longitudinal direction per GMW3335. Tests shall be performed using samples per ISO 6892 Type I (50mm gage length ASTM type sample), ISO 6892 Type II (80mm gage length DIN type sample) or JIS Z 2201 (#5). Strain hardening exponent n and K value shall be determined per ISO 10275. The specific strain level shall be reported with all test results. Strain hardening exponent n and K value shall be determined at 10 to 20% strain, or at 10% to end of uniform elongation when uniform elongation is less than 20%. If the maximum uniform elongation is less than 10%, the strain hardening exponent must be measured from 5% to the end of uniform elongation. N-value requirements are not applicable for steels with uniform elongation less than 5%. Dual Phase grades require an additional determination of n-value at 4 to 6 % strain. The specific strain range shall be reported with all test results. 3.1.2.1 Mechanical Property Requirements of Dual Phase (DP), Ferrite Bainite (FB) Transformation Induced Plasticity (TR), Multiphase (MP) and



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GM WORLDWIDE ENGINEERING STANDARDS GMW3399


April 2006 Page 3 of 14

Martensitic (MS) Grades. Mechanical property requirements of Dual Phase, Ferrite Bainite, TRIP, Multiphase and Martensitic hot rolled, cold reduced, uncoated and coated sheet steel grades are based on the minimum as-received tensile strength. Some multi phase steels (DP, TR, MP) have the additional requirement of a bake-hardening index (BHI). Where required, the material shall attain an increase in lower yield strength as specified in the appropriate table after 2% tensile strain and baking at 170oC for 20 minutes. Figure A1 in the Appendix defines Bake Hardening and Work Hardening Indexes. 3.1.2.2 Bend Test Requirements for Martensitic (MS) Grades. Martensitic grades must meet the requirements of the bend test as shown in Table 8 and Table 9. Testing shall be performed per GMW3335. 3.1.2.3 Mechanical Property Requirements of Ferrite Bainite (FB) Grades. Ferrite Bainite (FB) grades must meet the requirements of the hole expansion test as shown in Table 4. Testing shall be performed per ISO TC 164. 3.1.3 Physical Requirements. 3.1.3.1 Material Thickness and Tolerance. The detailed engineering part drawing or electronic math file will specify the material thickness and tolerance. 3.1.3.2 Surface Requirements. 3.1.3.2.1 Surface Texture. Specific requirements for the texture for each region are detailed in the Appendix A - Deviation Sheet. 3.1.3.2.2 Surface Quality. The steel shall be free from surface defects as negotiated between purchaser and supplier. For unexposed (U) surfaces, defects such as slight indentations, small marks, minor scratches, and slight coloring, which do not affect corrosion resistance, formability or the application of surface coatings are allowed. Exposed (E) surfaces shall be free of defects that might affect the uniform appearance of high quality paint coating. Semi-exposed (Z) surfaces are spangle free and temper rolled to impart a higher degree of smoothness than is normal for unexposed hot dip galvanized products. Certain applications require that both surfaces of the steel be of exposed (E) or semi-exposed (Z) surface quality. The other surfaces shall conform at least to surface quality U. Regulations in detail will be issued by the local business unit. 3.1.3.2.3 Phosphateability/Paint Appearance. For painted applications, the surface shall be capable of achieving a high quality zinc phosphate conversion coating using materials and processing

information specified in GMW3011. For GM North America applications, steel supplied to this specification must be qualified to meet phosphateability and paint appearance requirements per 9984001 and qualified according to GM9769P. For GME applications, phosphateability and paint appearance are required to meet GME 00007 for organic coated parts. 3.1.3.2.4 Adhesive Bondability. For bonded applications, the surface of the flat products furnished to this specification shall be capable of adhering to surfaces bonded with GM qualified and approved adhesives. 3.1.3.3 Microstructure. 3.1.3.3.1 Grain Size. Grain size shall be tested to ASTM E112 and shall be consistent throughout the thickness of the sheet. 3.1.3.3.2 Inclusions. Two (2) optional methods for analysis are available. There should be an agreement with the local business unit which of the two following methods has to be performed: Method A: ASTM E45 Method D, Plate III, by analysis @ 100X inclusion content shall not exceed a rating of 2.0 for thin and 2.0 for heavy. Method B: Opel 105 (DIN 50602) technique M: by analysis, inclusions shall not exceed size index 3; in case of diameters smaller than 20 mm, they shall not exceed size index 2. 3.1.3.4 Marking. If required, marking shall be carried out on the unexposed surface of full finish coils for outer panels and on the outer side of the coils for inner panels. The marking must be agreed upon between the supplier and purchaser. The purchaser must release the marking ink. 3.1.3.5 Other Requirements. Requirements such as tolerances on product shape and dimensions, inspections units, number of tests, sampling, test conditions, retests, inspection documents, packing, and handling of disputes shall be agreed upon between supplier and the local business unit. 3.2 Processing Requirements. 3.2.1 Additional Requirements. 3.2.1.1 Welding. The steel substrates supplied to this standard shall be suitable for welding by the accepted local welding methods. When the steel is used in welded applications, welding procedures shall be suitable for the steel chemistry and intended service. Note that standard weld test methods are intended for yield strength levels up to 420 MPa. Modifications to these methods may be required for higher strength levels. Due to unique properties of multi phase and ultra high strength steels,



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selection of the weld process parameters should be determined in consultation with the steel supplier. 3.2.1.2 Weld Seams in Coils. If weld seams in cold rolled material are allowed by Global Manufacturing Engineering Department, the following restrictions have to be considered: For cold reduced coils, pickling weld seams from the manufacturing process of hot rolled coils is permissible without restriction. Punch holes may be used for cold reduced coils to detect weld seams, but must be avoided in stamped parts. For cold reduced coils with exposed (E) or semi-exposed (Z) surfaces, weld seams are permissible but must be indicated by perforation. For cold reduced coils with unexposed (U) surfaces, weld seams are not permissible unless special exceptions are made by the local organization. For hot rolled coils, weld seams are not permissible. 3.2.1.3 Stretcher Strains. All exposed (E) and semi exposed (Z) products shall be free from stretcher strains for six (6) months after shipment of the coil from the producing mill. All unexposed (U) products shall be free of stretcher strains as agreed upon between purchaser and supplier. 3.3 Performance Requirements. Not applicable. 3.4 Requirements on Other Stages during Life Cycle. 3.4.1 Chemical Requirements. Provisions must be made to prevent the addition of such elements (see paragraph 5.3) from scrap or other materials used in the manufacturing process which would impair the recycleability of the finished components. 3.4.2 Mechanical Requirements. All materials supplied to this specification must be free of hydrogen embrittlement sensitivity. These materials may require baking treatments after electroplating to eliminate hydrogen embrittlement.

4 Manufacturing Process Not applicable.

5 Rules and Regulations 5.1 Legal Regulations. For use of this material the valid laws and other regulations and recommendations in the country of usage have to be followed. 5.2 Language. In the event of any conflict between the English and domestic language regarding this document, the English language will take precedence.

5.3 Restricted & Reportable Chemicals. All materials supplied to this specification must comply with the requirements of GMW3059. 5.4 Inspection & Rejection. All shipments of materials or parts under contract or purchase order manufactured to this specification shall be equivalent in every respect to the initial samples approved by engineering. There shall be no major changes in formulation or manufacturing process permitted without prior notification and approval by engineering. Lack of notification by the supplier constitutes grounds for rejection of any shipment. While samples may be taken from incoming shipments and checked for conformance to this specification, the supplier shall accept the responsibility for incoming shipments meeting this specification without dependence upon purchasers inspection. 5.4.1 Quality Requirements. The supplier shall develop quality process control procedures compliant with QS9000 demonstrating that the product will conform to all specification requirements. The data required to be submitted for this specification for each shipment will be determined by the regional manufacturing location. 5.5 Initial Source Approval. No shipments shall be made by any supplier until preliminary technical approval (inclusive material tests at supplier and/or GM) has been obtained. 5.6 Safety Data Sheets. Completed copies of the Materials Safety Data Sheets meeting GM information requirements, consistent with ISO 11014-1 standard shall be submitted with any new material submissions or where a composition change has occurred.

6 Approved Sources Engineering qualifications of an approved source is required for this specification. Only sources listed in the GM Materials File (i.e., MATSPC) under this specification number have been qualified by engineering as meeting the requirements of this specification. For other GM locations, the responsible engineering group should be contacted to obtain the approved source in that individual country.

7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable.



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8 Coding System The coding system for GMW sheet steel specifications on engineering part drawings and manufacturing engineering documents shall use a nomenclature consisting of the material designation, steel product type, minimum tensile/minimum yield strength, and surface quality or coating designation. The material designation is defined by the applicable GMW base metal material specification that follows the GMW specification number system. The minimum tensile strength and minimum yield strength is specified in megapascals (MPa) by a numerical designation. The Surface Quality is designated as either E for exposed, Z for semi-exposed, or U for unexposed applications. For coated applications, refer to GMW-8-M-STS for hot dip zinc coatings and GMW-11-M-STS for electrogalvanized coatings. The GMW sheet steel specification shall be called out on engineering drawings and manufacturing engineering documents as follows: 8.1 Example of coding for uncoated multi phase and ultra high strength steel: 8.1.1 Example of engineering part drawing and manufacturing coding for uncoated high strength steel: GMW3399M-ST-S CR900T/700YMS UNCOATED U

Where:

GMW = Validation Area (GM Worldwide)

3399 = Sequential Number

GMW3399 = Material Type (Base material specification)

M = Material Type: Metals

ST = Category: Steel

S = SubCategory: Sheet

900T = Minimum Tensile Strength (MPa)

700Y = Minimum Yield Strength (MPa)

MS = Steel Type (DP,FB,TR,MP,MS)

UNCOATED = Uncoated Substrate Designation

U = Surface Quality (paragraph 3.1.3.2.2

8.2 Example of coding for hot dip zinc coated multi-phase and ultra high strength steel: 8.2.1 Example of engineering part drawing and manufacturing coding for hot dip zinc coated high strength steel:

GMW3399M-ST-S CR590T/380Y TR HD60G60G U

Where:



GMW3399 = Material Type (Base material specification)






TR = Steel Type (DP, FB, TR MP, MS)

HD60G60G = Coating Designation (see GMW8 for details)

U = Surface Quality (paragraph 3.1.3.2.2)

8.3 Example of coding for electrogalvanized coated multi phase and ultra high strength steel: 8.3.1 Example of engineering part drawing and manufacturing coding for electrogalvanized coated high strength steel:



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GMW3399M-ST-S CR490T/290Y DP EG60G60G U

Where:



GMW3399 = Material Type (Base material specification






DP = Steel Type (DP,FB,TR,MP,MS)

EG60G60G = Coating Designation (see GMW11M for details)

U = Surface Quality (paragraph 3.1.3.2.2

9 Release and Revisions 9.1 Release. This standard originated in January 2000. It was approved by GM-North America and the involved GMAO partners in February, 2003. It was first published in February 2003. 9.2 Revisions.

Rev Approval Date

Description (Organization)

A APR 2006 This first revision is a reformation from its original release. It states requirements for new steel grades as well as modifications to existing steel grade requirements to accommodate global supply and product development.



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Table 1: General Chemical Compositions1,2

GMW3399M-ST-S C Mn Al Si P S Cu B

Grade Type Max % Max % Min % Max % Max % Max % Max % Max %

DP3 0.23 3.3 0.010 2.0 0.090 0.015 0.205 0.006

TR 0.30 2.5 0.010 2.2 0.090 0.015 0.20 N/A

MS4 0.30 3.0 0.010 2.2 0.020 0.025 0.20 N/A

MP 0.25 2.2 0.010 2.0 0.050 0.015 0.20 N/A

FB 0.18 2.0 0.010 0.5 0.040 0.010 --- ---

NOTE 1: Chemical composition based on mass % product (ladle, coil or sheet/blank) analysis. NOTE 2: In addition to requirements shown in the table, %Ni+%Cr+%Mo < 1.5 NOTE 3: All DP grades with C%




Table 3: Dual Phase Hot Rolled Grades Mechanical Property Requirements 1

GMW3399-M-ST-S

Yield Strength2,3

@ 0.2% Offset (MPa)

Tensile Strength

(MPa)

Total Elong.

in 50 mm

Total Elong.

in 80 mm (ISO II)

n value @ 10-20%3, 4, 5

n-value @ 4-6% 3

BH2 MPa

Designation Common Name6

Min. Max. Min. ISO I JIS % Min. Min. Min. Min.

HR580T/330Y DP HR DP600 330 450 580 21 22 19 0.14 0.18 30

HR780T/450Y DP HR DP800 450 610 780 15 16 14 0.11 0.16 30

NOTE 1: Additional demands can be specified by local units. NOTE 2: The yield stress values shall apply for the 0.2 proof stress, Rp 0.2 , if the yield stress cannot be easily recognized, otherwise the

values shall be the lower yield stress, ReL. NOTE 3: Minimum yield strength and/or minimum n-values can be waived upon agreement between user and supplier. NOTE 4: If maximum uniform elongation is less than 20%, then n-value shall be measured from 10% to maximum uniform elongation. NOTE 5: If maximum uniform elongation is less than 10%, then n-value shall be measured from 5% to maximum uniform elongation. NOTE 6: Common names are provided for informational purposes, and are NOT to be used on drawings or electronic math data files.

Table 4: Ferrite + Bainite Hot Rolled Grades (Dual Phase With High Hole Expansion)

Mechanical Property Requirements 1

GMW3399-M-ST-S Yield Strength2,3 @ 0.2% Offset (MPa)

Tensile Strength

(MPa)

Total Elong.

in 50 mm

Total Elong.

in 80 mm (ISO II)

n value @ 10-20%3, 4, 5

Minimum Hole

Expansion (%)


Min. Max. Min. ISO I JIS % Min. Min. Min.

HR450T/300Y FB HR FB450 300 380 450 26 28 24 __7 __7

HR580T/440Y FB HR FB600 440 620 580 15 17 14 0.08 75

HR780T/600Y FB HR FB800 600 800 780 13 15 12 0.07 55

Note 1: Additional demands can be specified by local units. Note 2: The yield stress values shall apply for the 0.2 proof stress, Rp 0.2, if the yield stress cannot be easily recognized, otherwise the values shall be the lower yield stress, ReL. Note 3: Minimum yield strength and/or minimum n-value can be waived upon agreement between user and supplier. Note 4: If maximum uniform elongation is less than 20%, then n-value shall be measured from 10% to maximum uniform elongation. Note 5: If maximum uniform elongation is less than 10%, then n-value shall be measured from 5% to maximum uniform elongation. Note 6: Common names are provided for informational purposes, and are NOT to be used on drawings or electronic math data files. Note 7: Requirement based on processing capability yet to be determined.



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Table 5: Dual Phase Cold Rolled Grades Mechanical Property Requirements 1

GMW3399-M-ST-S Yield Strength2,3 @ 0.2% Offset (MPa)

Tensile Strength

(MPa)

Total Elong.4

in 50 mm % Min.

Total Elong.4

in 80 mm (ISO II)

n value @ 10-20%3,5,6

n-value @ 4-6% 2,3

BH2 MPa



CR450T/250Y DP

CR DP450 250 320 450 __8 30 27 0.16 __8 30

CR490T/290Y DP

CR DP500 290 390 490 25 27 24 0.15 0.19 30

CR590T/340 Y DP

CR DP600 340 440 590 21 22 21 0.14 0.18 30

CR780T/ 420Y DP

CR DP800 420 550 780 14 17 15 0.11 0.15 30

CR980T/ 550Y DP

CR DP1000 550 730 980 8 10 10 N/A 0.08 30

Note: 1 Local units can specify additional demands. Note 2: The yield stress values shall apply for the 0.2 proof stress, Rp 0.2 , if the yield stress cannot be easily recognized, otherwise the

values shall be the lower yield stress, ReL. Note 3: Minimum yield strength and/or minimum n-values can be waived upon agreement between user and supplier Note 4: When the specified nominal thickness is less than 0.7 mm and greater than 0.5 mm the minimum value for elongation shall be

reduced by 2 units. For thickness less than or equal to 0.5 mm the minimum value shall be reduced by 4 units. Note 5: If maximum uniform elongation is less than 20%, then n-value shall be measured from 10% to maximum uniform elongation. Note 6: If maximum uniform elongation is less than 10%, then n-value shall be measured from 5% to maximum uniform elongation. Note 7: Common names are provided for informational purposes, and are NOT to be used on drawings or electronic math data files. Note 8: Requirement based on processing capability yet to be determined.

Table 6: High & Low Yield Dual Phase Cold Rolled Grades

Mechanical Property Requirements 1 GMW3399-M-

ST-S Yield Strength2,3

@ 0.2% Offset (MPa)

Tensile Strength

(MPa)

Total Elong.4

in 50 mm % Min.

Total Elong.4

in 80 mm (ISO II)

n value @ 10-20%3,5,6

n-value @ 4-6% 2,3

BH2 MPa



CR590T/280Y DP

DP600 Low Yield

280 380 590 21 23 22 0.14 0.19 30

CR590T/420Y DP

DP600 High Yield

420 500 590 20 19 16 0.08 __8 30

CR690T/550Y DP

DP700 High Yield

550 660 690 13 15 12 0.06 0.08 30

CR780T/500Y DP

CR DP800 High Yield

500 650 780 15 17 10 0.06 0.10 30

CR980T/650Y DP

CR DP1000 High Yield

650 900 980 8 10 8 N/A N/A 30

Note 1: Local units can specify additional demands. Note 2: The yield stress values shall apply for the 0.2 proof stress, Rp 0.2 , if the yield stress cannot be easily recognized, otherwise the

values shall be the lower yield stress, ReL. Note 3: Minimum yield strength and/or minimum n-values can be waived upon agreement between user and supplier Note 4: When the specified nominal thickness is less than 0.7 mm and greater than 0.5 mm the minimum value for elongation shall be

reduced by 2 units. For thickness less than or equal to 0.5 mm the minimum value shall be reduced by 4 units. Note 5: If maximum uniform elongation is less than 20%, then n-value shall be measured from 10% to maximum uniform elongation. Note 6: If maximum uniform elongation is less than 10%, then n-value shall be measured from 5% to maximum uniform elongation. Note 7: Common names are provided for informational purposes, and are NOT to be used on drawings or electronic math data files. Note 8: Requirement based on processing capability yet to be determined.



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Table 7: Transformation Induced Plasticity (Trip) Cold Roll Grades Mechanical Property Requirements 1

GMW3399-M-ST-S

Yield Strength2,3

@ 0.2% Offset (MPa)

Tensile Strength

(MPa)

Total Elong. 4

in 50 mm % Min.

Total Elong. 4

In 80 mm (ISO II)

n value @ 10-20%4,5

BH2 MPa



CR590T/380Y TR

CR TRIP600 380 480 590 27 29 26 0.20 30

CR690T/410Y TR

CR TRIP700 410 530 690 __7 27 24 0.19 30

CR780T/440Y TR

CR TRIP800 440 600 780 21 23 20 0.15 30


values shall be the lower yield stress, ReL. Note 3: Minimum yield strength and/or minimum n-values can be waived upon agreement between user and supplier. Note 4: When the specified nominal thickness is less than 0.7 mm and greater than 0.5 mm the minimum value for elongation shall be

reduced by 2 units. For thickness less than or equal to 0.5 mm the minimum value shall be reduced by 4 units. Note 5: If maximum uniform elongation is less than 20%, then n-value shall be measured from 10% to maximum uniform elongation. Note 6: Common names are provided for informational purposes, and are NOT to be used on drawings or electronic math data files. Note 7: Requirement based on processing capability yet to be determined.

Table 8: Martensitic Cold Rolled Grades

Mechanical Property Requirements 1

GMW-3399-M-STS Yield Strength2,3,4 @ 0.2% Offset

(MPa)

Tensile Strength2

(MPa)

Total Elong.

in 50 mm2 % Min

Total Elong.

in 80 mm 2 (ISO II)

Minimum Bend Radius


Min. Max. Min. ISO I JIS % Min. Long. Trans.

CR900T/700Y MS CR MS 900 700 1000 900 3 6 6 4T 4T

CR1100T/860Y MS CR MS 1100 860 1100 1100 3 __6 5 4T 4T

CR1300T/1030Y MS CR MS 1300 1030 1300 1300 2 __6 3 4T 4T

CR1500T/1200Y MS CR MS 1500 1200 1500 1500 2 __6 2 4T 4T

Note 1: Local units can specify additional demands. Note 2: Parameters valid in the longitudinal test direction. Note 3: The yield stress values shall apply for the 0.2 proof stress, Rp 0.2 , if the yield stress cannot be easily recognized, otherwise the values shall be the lower yield stress, ReL. Note 4: Minimum yield strength can be waived upon agreement between user and supplier. Note 5: Common names are provided for informational purposes, and are NOT to be used on drawings or electronic math data files. Note 6: Requirement based on processing capability yet to be determined.



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Table 9: Martensitic Hot Rolled Grades Mechanical Property Requirements 1

GMW-3399-M-STS Yield Strength2,3,4 @ 0.2% Offset

(MPa)

Tensile Strength2

(MPa)

Total Elong.

in 50 mm2 % Min

Total Elong. in 80 mm 2 (ISO II)

Minimum Bend Radius


Min. Max. Min. ISO I JIS % Min. Long. Trans.

HR1200T/1030Y MS HR MS 1200

1030 1150 1200 __6 __6 5 4T 4T

HR1400T/1050Y MS HR MS 1400

1050 1250 1400 __6 __6 4 4T 4T

Note 1: Local units can specify additional demands. Note 2: Parameters valid in the longitudinal test direction. Note 3: The yield stress values shall apply for the 0.2 proof stress, Rp 0.2 , if the yield stress cannot be easily recognized, otherwise the values shall be the lower yield stress, ReL. Note 4: Minimum yield strength can be waived upon agreement between user and supplier. Note 5: Common names are provided for informational purposes, and are NOT to be used on drawings or electronic math data files. Note 6: Requirement based on processing capability yet to be determined.

Table 10: Hot Roll Multiphase Grades Mechanical Property Requirements 1

GMW3399-M-ST-S

Yield Strength2,3 @ 0.2% Offset (MPa)

Tensile Strength

(MPa)

Total Elong.

in 50 mm % Min.

Total Elong.

In 80 mm (ISO II)

n value @ 10-20%3,4,5

BH2 MPa



HR780T/650Y MP

HR MP 800 650 800 780 __7 __7 10 __7 30

HR950T/720Y MP

HR MP 1000 720 920 950 __7 __7 9 __7 30


values shall be the lower yield stress, ReL. Note 3: Minimum yield strength and/or minimum n-value can be waived upon agreement between user and supplier Note 4: If maximum uniform elongation is less than 20%, then n-value shall be measured from 10% to maximum uniform elongation. Note 5: If maximum uniform elongation is less than 10%, then n-value shall be measured from 5% to maximum uniform elongation. Note 6: Common names are provided for informational purposes, and are NOT to be used on drawings or electronic math data files. Note 7: Requirement based on processing capability yet to be determined.



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Appendix A - Deviation Sheet. Deviations on requirements for local business units. A3.1 Requirements on Delivery.

A3.1.1 Chemical Requirements.

GMNA and GM-Europe: Only coil or sheet/blank analysis is permitted. A3.1.1.1 Base Metal.

GMAO-Latin America: Refer to EMS.ME.1508. GMAO-Asia Pacific: Steel products shall have chemical composition that is agreed between purchaser and supplier that is capable of achieving the desired mechanical properties specified in GMW3399. A3.1.1.2 Surface Treatment.

GMNA: Products coated with a designated lubricant (i.e., mill oil or prelube) shall comply with GM North America specification 9984001. GM Europe: Products coated with a designated lubricant (e.g. mill oil or prelube) shall comply with specifications B0401270/B0401271 (oil) respective with GME 8689. GM Latin America Products coated with a designated lubricant (e.g. mill oil or prelube) shall comply with specification EMS.9310015 and EMS.ME.1508. GMAO-Asia Pacific: Mill oils, shipping oils, press oils, etc., applied to the material by the steel mill and the parts manufacturer must be removable in the purchasers phosphate precleaner system. The material must be capable of achieving an even phosphate coating in the purchasers phosphate system. The phosphate coating weight and crystal morphology must be as expected for that type of sheet metal material. For Isuzu, refer to sub-clause 6 of JFS A 1001. A3.1.2 Mechanical Requirements.

GMNA: 4-6% n-value testing not required. All specified values must be met in the longitudinal (L) direction. GMAO-Europe and GMAO-Latin America: The Yield Strength (0.2% Offset) requirement for DP500 shall be 370 MPa max., and for DP600 shall be 410 MPa max. Designation of carry over parts to be used on global platform vehicles must be changed into the new GMW Material Description System. GMAO-Asia Pacific: Australian and Japanese Steel Suppliers for Holden shall perform tensile testing to Australian Standard AS 1391, and to Japanese

Industrial Standard JIS Z 2201 (No. 5 test piece), respectively. GM-Europe: All specified values must be met in the longitudinal (L) direction. A3.1.3.2 Surface Requirements. A3.1.3.2.1 Surface Texture.

GMNA: Refer to GM6180M. GM-Europe: Refer to EN10 049 GMAO-Latin America: Refer to EMS.ME.1508. GMAO-Asia Pacific: To satisfy Holden exterior topcoat systems HN 1623, HN 1643 and HN 1673 requirements, the surface texture of materials used for highly visible exterior surface of the vehicle must not decrease the distinction of image (DOI) or gloss of the applied paint. For Isuzu applications, Refer to sub-clause 6 of JFS A 1001. Surface texture for all cold rolled exposed surfaces shall be tested to JIS B 0651 and conform to JIS B 0610. Surface finish may be supplied as bright (B), normal (C), or rough (D). In general, cold rolled products shall be supplied with normal(C) finish. A3.1.3.2.2 Surface Quality.

GM Europe The semi-exposed (Z) surface is not to be specified. Exposed (E) and unexposed (U) cold rolled and coated products are to be temper rolled. GMAO-Latin America: Refer to EMS.ME.1508. GMAO-Asia Pacific: All products shall be free from stretcher strains for six (6) months unless otherwise agreed upon between purchaser and supplier. Surface finish and quality should be negotiated between the steel mills and parts manufacturer to be appropriate to the final use of the part. In all cases the supplied steel and the parts made from that steel shall be clean and free of scale, stains, corrosion, debris or any other defects which would be objectionable on the finished part. A3.1.3.3.1 Inclusions GMAO-Asia Pacific (Isuzu) - Inclusions refer to sub-clause 14.2 of JFS A 1001. A3.1.3.3.2 Grain Size. GMAO-Asia Pacific (Isuzu) - Grain size is not designated for any material. A3.2 Processing Requirements. GMAO-Latin America: Cold Bending for Part Design Purpose. Ultra high strength steels are frequently fabricated for cold bending. Many interrelated factors affect the ability of given piece of steel to form over any given radius in shop practice. These factors include thickness, strength



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level, degree of restraint in bending, relationship to rolling direction, chemical composition and microstructure.

GMNA Further information can be found in the GMNA sheet steel qualification standard (GM9769P) or from GPSC (Global Purchasing and Supply Chain). A5.4 Inspection and Rejection.

BH2

W H = W ork hardening

Stress

170oC/20 m inutes

W H

Strain2%Pre-Strain

Figure A1: Definition of Bake Hardening and Work Hardening Indexes Figure A1 illustrates the definition of the Bake Hardening index (BH2) on schematic diagrams of stress-strain curves. The bake-hardening index for bake hardenable steels shall be determined on specimens that 2% prestrained and baked at 170o C for 20 minutes.

A6. Approved Sources. GMAO-North America: Purchased parts not in the GM Resale program shall meet specification requirements, however, they are not required to be approved suppliers in the GM Corporate Materials File (Matspc).



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Appendix B: Developmental Grades. The following grades are currently being developed by steel mills as directed in various regions to meet specific end-product and/or manufacturing requirements. Further development of these grades and subsequent specification revisions are necessary prior to removal of these grades from Appendix B and placement into the main document. The following table does not imply all grades referenced in the main document are globally available.

Table B1: Developmental Grades

GMW3399-M-STS Yield Strength2,3

@ 0.2% Offset (MPa)

Tensile Strength

(MPa)

Total Elong.4

in 50 mm % Min.

Total Elong.4

in 80 mm (ISO II)

n value @ 10-20%3,5

n-value (4-6%)2,3

BH2 MPa



CR780T/500Y MS CR MS 800 500 700 780 10

CR980T/700Y MS CR MS 1000 700 960 980 6

CR1180T/820Y MS CR MS 1200 820 1130 1180 2 4 3

HR490T/xxxY DP HR DP500 __7 __7 490

HR980T/xxxY FB HR FB1000 __7 __7 980

HR590T/400Y TR HR TRIP600 400 __7 590

HR690T/xxxY TR HR TRIP700 __7 __7 690

HR780T/450Y TR HR TRIP800 450 __7 780

Note 1: Local units can specify additional demands. Note 2: The yield stress values shall apply for the 0.2 proof stress, Rp 0.2 , if the yield stress cannot be easily recognized, otherwise the values shall be the lower yield stress, ReL. Note 3: Minimum yield strength and/or minimum n-values can be waived upon agreement between user and supplier Note 4: When the specified nominal thickness is less than 0.7 mm and greater than 0.5 mm the minimum value for elongation shall be reduced by 2 units. For thickness less than or equal to 0.5 mm the minimum value shall be reduced by 4 units. Note 5: If maximum uniform elongation is less than 20%, then n-value shall be measured from 10% to maximum uniform elongation. Note 6: Common names are provided for informational purposes, and are NOT to be used on drawings or electronic math data files. Note 7: Requirement based on processing capability yet to be determined.



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1 Scope1.1 Material Description. The specification applies to uncoated and coated, dual phase (ferrite + martensite) (DP), dual phase with high hole expansion (ferrite + bainite) (FB), transformation induced plasticity (ferrite + bainite + retained austenite) (TRIP, or TR), multi-phase (ferrite + martensite + bainite + precipitation hardening) (MP) or martensitic (MS) materials. The CR550 grade has been removed from GMW3032 and is now covered by this specification as GMW3399M-ST-S CR690T/550YDP. These steels also have a specified minimum yield strength, but the applications in which these steels are used are not typically yield strength dependent, therefore this is not the major classification criterion. These products shall be supplied as coils or sheet. Hot rolled flat products are usually supplied in thicknesses greater than 1.80 mm. Cold rolled flat products with the appropriate surface type and surface finish are suitable for the application of surface coatings (metallic hot dipping, electrolytic plating, hot spray painting, organic coatings and/or other coatings). This specification does not apply to steel for case hardening and cold reduced, work hardened strips. Additional requirements or agreements have to be specified by local business units. [e.g., North America (NA), Europe (E), Latin America (LA), and Asia Pacific (AP)].1.2 Material Identification. The GMW base metal specification number defines the material designation, steel product type, grade, and finish type. The steel product type is CR for cold rolled products, or HR for hot rolled products. For example, the grade description 590T/340Y designates the minimum tensile strength/minimum yield strength in megapascals (MPa). A designation of steel type (i.e. DP, TR, FB, MP or MS) shall be added. The steel grades will correspond to the chemical and mechanical requirements as shown in Tables 1 through 8. The finish type, an alpha character, will designate the finish as E (exposed), Z (semi-exposed) or U (unexposed). The above descriptive items are used together to form the coding system. Examples of the coding system for engineering part drawings and manufacturing engineering documents are shown in paragraph 8.1.3 Symbols. Not applicable. 1.4 Typical Applications. Typical applications are sheet metal parts consisting of coated and uncoated high strength sheet steel with specified minimum tensile strengths from 450 MPa through 1500 MPa.2 References2.1 External Standards/Specifications.2.2 GM Standards/Specifications.2.3 Additional References. 3 Requirements3.1 Requirements on Delivery.3.1.1 Chemical Requirements.3.1.1.1 Base Metal. Base metal composition based on product (ladle, coil or sheet/blanks) analysis determined per ASTM A751 shall conform to the general requirements of Table 1 and the grade specific requirements in Table 2 (if applicable) and/or shall be agreed upon between supplier and purchaser. Additional demands and restrictions may be imposed by local Materials Engineering organizations depending on the application.3.1.1.2 Surface Treatment. Products must be coated with a designated lubricant approved by the local business unit. See Appendix A.3.1.2 Mechanical Requirements. The steel products shall meet the mechanical properties as specified in Tables 3-10. The 0.2% Offset Yield Strength, Tensile Strength and Percent Total Elongation shall be determined in the longitudinal direction per GMW3335. Tests shall be performed using samples per ISO 6892 Type I (50mm gage length ASTM type sample), ISO 6892 Type II (80mm gage length DIN type sample) or JIS Z 2201 (#5). Strain hardening exponent n and K value shall be determined per ISO 10275. The specific strain level shall be reported with all test results.3.1.2.1 Mechanical Property Requirements of Dual Phase (DP), Ferrite Bainite (FB) Transformation Induced Plasticity (TR), Multiphase (MP) and Martensitic (MS) Grades. Mechanical property requirements of Dual Phase, Ferrite Bainite, TRIP, Multiphase and Martensitic hot rolled, cold reduced, uncoated and coated sheet steel grades are based on the minimum as-received tensile strength.3.1.2.2 Bend Test Requirements for Martensitic (MS) Grades. Martensitic grades must meet the requirements of the bend test as shown in Table8 and Table 9. Testing shall be performed per GMW3335.3.1.2.3 Mechanical Property Requirements of Ferrite Bainite (FB) Grades. Ferrite Bainite (FB) grades must meet the requirements of the hole expansion test as shown in Table 4. Testing shall be performed per ISOTC 164.3.1.3 Physical Requirements.3.1.3.1 Material Thickness and Tolerance. The detailed engineering part drawing or electronic math file will specify the material thickness and tolerance.3.1.3.2 Surface Requirements.3.1.3.2.1 Surface Texture. Specific requirements for the texture for each region are detailed in the Appendix A - Deviation Sheet.3.1.3.2.2 Surface Quality. The steel shall be free from surface defects as negotiated between purchaser and supplier. For unexposed (U) surfaces, defects such as slight indentations, small marks, minor scratches, and slight coloring, which do not affect corrosion resistance, formability or the application of surface coatings are allowed. Exposed (E) surfaces shall be free of defects that might affect the uniform appearance of high quality paint coating. Semi-exposed (Z) surfaces are spangle free and temper rolled to impart a higher degree of smoothness than is normal for unexposed hot dip galvanized products. Certain applications require that both surfaces of the steel be of exposed (E) or semi-exposed (Z) surface quality. The other surfaces shall conform at least to surface quality U. Regulations in detail will be issued by the local business unit.3.1.3.2.3 Phosphateability/Paint Appearance. For painted applications, the surface shall be capable of achieving a high quality zinc phosphate conversion coating using materials and processing information specified in GMW3011. For GM North America applications, steel supplied to this specification must be qualified to meet phosphateability and paint appearance requirements per 9984001 and qualified according to GM9769P. For GME applications, phosphateability and paint appearance are required to meet GME 00007 for organic coated parts.3.1.3.2.4 Adhesive Bondability. For bonded applications, the surface of the flat products furnished to this specification shall be capable of adhering to surfaces bonded with GM qualified and approved adhesives.3.1.3.3 Microstructure.3.1.3.3.1 Grain Size. Grain size shall be tested to ASTM E112 and shall be consistent throughout the thickness of the sheet.3.1.3.3.2 Inclusions. Two (2) optional methods for analysis are available. There should be an agreement with the local business unit which of the two following methods has to be performed:3.1.3.4 Marking. If required, marking shall be carried out on the unexposed surface of full finish coils for outer panels and on the outer side of the coils for inner panels. The marking must be agreed upon between the supplier and purchaser. The purchaser must release the marking ink.3.1.3.5 Other Requirements. Requirements such as tolerances on product shape and dimensions, inspections units, number of tests, sampling, test conditions, retests, inspection documents, packing, and handling of disputes shall be agreed upon between supplier and the local business unit.3.2 Processing Requirements.3.2.1 Additional Requirements.3.2.1.1 Welding. The steel substrates supplied to this standard shall be suitable for welding by the accepted local welding methods. When the steel is used in welded applications, welding procedures shall be suitable for the steel chemistry and intended service.3.2.1.2 Weld Seams in Coils. If weld seams in cold rolled material are allowed by Global Manufacturing Engineering Department, the following restrictions have to be considered:3.2.1.3 Stretcher Strains. All exposed (E) and semi exposed (Z) products shall be free from stretcher strains for six (6) months after shipment of the coil from the producing mill. All unexposed (U) products shall be free of stretcher strains as agreed upon between purchaser and supplier.3.3 Performance Requirements. Not applicable.3.4 Requirements on Other Stages during Life Cycle.3.4.1 Chemical Requirements. Provisions must be made to prevent the addition of such elements (see paragraph 5.3) from scrap or other materials used in the manufacturing process which would impair the recycleability of the finished components.3.4.2 Mechanical Requirements. All materials supplied to this specification must be free of hydrogen embrittlement sensitivity. These materials may require baking treatments after electroplating to eliminate hydrogen embrittlement.4 Manufacturing Process5 Rules and Regulations5.1 Legal Regulations. For use of this material the valid laws and other regulations and recommendations in the country of usage have to be followed.5.2 Language. In the event of any conflict between the English and domestic language regarding this document, the English language will take precedence. 5.3 Restricted & Reportable Chemicals. All materials supplied to this specification must comply with the requirements of GMW3059.5.4 Inspection & Rejection. All shipments of materials or parts under contract or purchase order manufactured to this specification shall be equivalent in every respect to the initial samples approved by engineering. There shall be no major changes in formulation or manufacturing process permitted without prior notification and approval by engineering. Lack of notification by the supplier constitutes grounds for rejection of any shipment. While samples may be taken from incoming shipments and checked for conformance to this specification, the supplier shall accept the responsibility for incoming shipments meeting this specification without dependence upon purchasers inspection. 5.4.1 Quality Requirements. The supplier shall develop quality process control procedures compliant with QS9000 demonstrating that the product will conform to all specification requirements. The data required to be submitted for this specification for each shipment will be determined by the regional manufacturing location.5.5 Initial Source Approval. No shipments shall be made by any supplier until preliminary technical approval (inclusive material tests at supplier and/or GM) has been obtained. 5.6 Safety Data Sheets. Completed copies of the Materials Safety Data Sheets meeting GM information requirements, consistent with ISO11014-1 standard shall be submitted with any new material submissions or where a composition change has occurred.6 Approved Sources7 Notes7.1 Glossary. Not applicable.7.2 Acronyms, Abbreviations, and Symbols. Not applicable.8 Coding System8.1 Example of coding for uncoated multi phase and ultra high strength steel:8.1.1 Example of engineering part drawing and manufacturing coding for uncoated high strength steel: 8.2 Example of coding for hot dip zinc coated multi-phase and ultra high strength steel:8.2.1 Example of engineering part drawing and manufacturing coding for hot dip zinc coated high strength steel:8.3 Example of coding for electrogalvanized coated multi phase and ultra high strength steel:8.3.1 Example of engineering part drawing and manufacturing coding for electrogalvanized coated high strength steel:9 Release and Revisions 9.1 Release. This standard originated in January 2000. It was approved by GM-North America and the involved GMAO partners in February, 2003. It was first published in February 2003.9.2 Revisions. MPaTotalTotal Appendix A - Deviation Sheet.A3.1 Requirements on Delivery.A3.1.1 Chemical Requirements.A3.1.1.1 Base Metal.A3.1.1.2 Surface Treatment.A3.1.2 Mechanical Requirements.A3.1.3.2 Surface Requirements.A3.1.3.2.1 Surface Texture.A3.1.3.2.2 Surface Quality.A3.1.3.3.1 InclusionsA3.1.3.3.2 Grain Size.A3.2 Processing Requirements.A5.4 Inspection and Rejection.A6. Approved Sources. Appendix B: Developmental Grades.

GMW3399 2006 04 (Multiphase Ultra High Strength Sheet Steel)

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