Is 432(Part-1) Specification for Mild Steel and Medium Tesil

5/25/2018 Is 432(Part-1) Specification for Mild Steel and Medium Tesil

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IS : 432(Partl)-1982

Indian StandardSPECIFICATION FOR

MILD STEEL AND MEDIUM TENSILE STEELBARS AND HARD-DRAWN STEEL WIRE FOR

CONCRETE REINFORCEMENTPART I MILD STEEL AND MEDIUM TENSILE STEEL BARS

Thi r d Revi si on )Fifth Reprint DECEMBER 1992

UDC 669.141.24-422+669.14-018*295-422 : 666 982~24

0 Copyri ght 1982BUREAU OF J NDJ AN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Gr 3 June 1982

( Reaffirmed 1995 )


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IS : 43 2 Part I ) - 1982I ndian St andard

SPECIFICATION FORMILD STEEL AND MEDIUM TENSILE STEELBARS AND HARD-DRAWN STEEL WIRE FOR

CONCRETE REINFORCEMENTPART 1 MILD STEEL AND MEDIUM TENSILE STEEL BARS

( Thi rd Rev i si onJoint Sectional Committee for Concrete Reinforcement, BSMDC 8

ChuirmanSBRI G. S. RAO

embers

RepresentingCentral Public Works Department, New Delhi

S~~PERINTENDI N~ NGI NEER ( CD0 ) ( AIttr~tc toShri G. S. Rao )DxJ . L. AsmaxSHRI A. N. MITRA ( Alternate ) The Tata Iron Steel Co Ltd, J amshedpurSHHI S. BANERJ EESEIKIS. N. CHANIU Steel Re-rolling Mills Association of India, CalcuttaMetallurgical and Engineering Consultants ( India )Ltd, RanchiSHR.I R. D. CHOUDI ~ARY ( Altcrnafe )CHIEF ENGINEE R ( D R ) Irrigation Department,Chandigarh Government of Punjab,DIRECTOR ( CD ) ( Alternafe )DEPUTY D~REOTOR, STAND~RDJ Research,( B S )-I Designs Standards Organization,LucknowASSISTANT D I R E c T o R,STANDARDS ( B S )-II ( ANcrnate )SHRI M. R. DOCTORSHRI S. G. J OSHI ( Alternate ) Special Steels Ltd, BombaySHRI V. GULATISHRI P. K. G~PTE Heatly Gtesham ( India ) Ltd, New DelhiNational Metallurgical Laboratory ( CSJ R ),SHRI N. C. J nw J amshedpurStup Consultants Ltd, BombaySHRI M. C. TANDON ( AIternate )SHRI M. P. J ASGJ A Research Development Centre for I ron SteelSHRI A. J AYAQOPAL ( Steel Authority of India Ltd ), RanchiEngineer-in-Chiefs Branch, Army Headquarters,New DelhiMutaJR. CHANDRASEKHAXAN ( Alternatc ) Continued on page 2 1

@ Cbpyr:ghr 1992BUREAU OF INDIAN STANDARDS

Tbu publication is protected under the Indiun Gpyrtght Act XIV of 1957 ) iM1reproduction in whole or in part by any means except with written permission of thepubliler tall be deemed to be an infringement of copyright under the said Act4


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IS : 432 Part I ) - 1982( Conhud frompage 1

Members RaprtscnlingSHR1 S. Y. ? AN Killick Nixon Ltd. BombaySHRI P. S. VENKAT ( Afttrnute )SERI K. K. KHANNA National Buildings Organization, New DelhiSERI K. S. .%tIN-rvASAN ( AhlMlt )SBEI M. N. KHANNA Bhilai Steel Plant, BbilaiSERI C. Daaom=~~ ( AltcrMrr )SERI S. N. MANOHARSHRI N. NAOARAJ ( Al;& ) Tata Consulting Engineers, BombaySHRI R. K. MATHUR Public Works Department, LucknowSBRJ Y. K. MEHTA The Concrete Association of India, BombaySHRI E. T. ANTIA ( Altcrmtc )DR P. K. MORANTY Tor Steel Research Foundation in Indii, CalcuttaDR INO. P. K. BANERJEE ( Al-t )SERI -4. D. NARA~ Roads Wing, Ministry of Shipping and TransportDuV.P. NARAYANABWAYY Struc;oy:kFengineering Research Centre ( CSIR ),

SERI Z. GEOROE Altmu:t )SERI S. N. PAL M. N. Dastur & Co (P) Ltd, CalcuttaSHRI SALIL ROY ( Aknnuft )SHRI B. K. PANTHAKY Hindustan Construction Co Ltd, BombaySHRI P. V. KAIK ( AlternateDR G. P. SAX.4 Gammon India Ltd, BombaySHRI A. C. ROY ( Ahrnalc )SFIRI T. SBN IRC Steels Ltd, CalcuttPSERI SEIRE IH H. SHAH Tensile Steel Ltd, Bombay

SRRI M. S. PATHAX ( AltcrrurltSHRI C. N. SRINIVASAN C. R. Narayana Rao, MadrasSARI C. N. RA~HA~ENDRAN ( AhnabSERX S. SUBRAMANIAN Cement Research Institute of India, New DelhiSHRI AWL KUMAR ( AhmaltSERX G. RAMAN, Director Gwteral,BIS ( &-o@ Mti )Director ( Civ Engg )Mary

SHRI M. N. NEELAKAXDHA~As&ant Director ( Civ Engg ) BIS

2


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IS : 432 ( Part I ) - 1982Indian Standard

SPECIFICATION FORMILD STEEL AND MEDIUM TENSILE STEELBARS AND HARD-DRAWN STEEL WIRE FOR

CONCRETE REINFORCEMENTPART I MILD STEEL AND MEDIUM TENSILE STEEL BARS

( Third Revision0. FOREWORD

0.1 This Indian Standard ( Part I ) ( Third Revision ) was adopted by theIndian Standards Institution on 31 March 1582, after the draft finalizedby the Joint Sectional Committee for Concrete Reinforreu\ent had beenapproved by the Civil Engineering Division Council and the Structuraland Metals Division Council.0.2 This standard was first published in 1953 and subsequently revisedin 1960 and 1966. The present revision hay been taken up with a viewto modifying the earlier provisions in the light of the experience gainedduring the use of this standard by both manufacturers and users.0.3 This standard adopts SI units in specifying the various physicalrequirements. Further, some of the provisions have been revised ba?edon the latest Indian Standards, such as IS : 22G-ltr75*, IS : 961-1975t,IS : 1599-1974:, IS : 1608-1972$, IS : 1732-197111, IS : 1762 ( Part I )-19741 and IS : 1977-1975**.0.4 The concrete reinforcement having an ultimate tensile strength ofnot less than 540 N/mm2 has been categorized as medium tensile steel instead of high tensile steel ( see IS : 961-1975t ) in this standard. Inconcrete reinforcement, the term high tensile steel is, as a general_._-.__

*Specification for structural steel ( standard quality ) (fiflh rwision ).+Specilication for structural steel ( high tensile ) ( secondeckion .*Method for bend test for steel products other than sheet, strip, wire and tube ( jirstrcviGn ) .Method foi tensile testing of steel products ( jirirst&ion ).IlDimensions for round and square steel bars for structural and gcncral cnginecrirgpurposes (J&t revision ).ICode for designation of steel : Part I Based on letter symbols (jirrf r i on ).**Specification for structural steel ( ordinary quality ) ( second coi sm 11.3


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IS : 432 Part I ) - 1982practice, used IO mean steel having tensile strengths in a &ill higherrange, say 1 000-2 200 N/mm which is generally used in prestrqsedconcrete.0.5 Grade II mild steel bars are not recommended for use in structureslocated in earthquake zones subjected to severe damage and forstructures subjected to dynamic loading ( other than wind loading ),such as railway and highway bridges ( see IS : 1893-1975* andIS : 1977-1973t ).0.6 \Velding of reinforcement bars covered in this specification shall bedone in accordance with t le requirements of IS : 2751-1966:.0.7 In the formulation of this standard, due weightage has been given tointernational coordination among the standards and practices preva%ngin different countries in addition to re ating it to the Practices in the fieldin this country.0.8 For the purpose of deciding whether a particular requirement ofthis standard, is complied with, the final value, observed or calculated,expressing the result of a test or analysis, shall be rounded off in accord-ance with IS : 2-19604. The number of significant places retained in therounded off value should be the same as that of the specified value in thisstandard.

1. SCOPE1.1 This standard ( Part I ) covers the requirements of mild steel andmedium tensile steel plain bars in round and square sections for use asreinforcement in concrete.2. TEBMINOLOGY2.0 For the purpose of this standard, the following definitions shallapply.2.1 Bar - A hot-rolled bar of steel of circular or square cross-section.2.2 Bundle - Two or more coils or a number of lengths properlybound together.2.3 Coil - One continuous bar as rolled in the form of a coil.

Criteria for earthquake resistant design of structures (r&d rtiiun ).tSpecifi:ation for structural steel ( ordinary quality ) ( sccmd retiion ).Code of practice for welding of mild steel bars used for reinforced concreteconstruction.&Rules for rounding off numerical valua ( m&d).

4


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IS : 432 ( Part I ) - 19822.4 Elongation - Increase in length of a tensile test piece under .stress.The elongation at fracture is conventionally expressed as a percentage ofthe original gauge len-,th of a standard test piece.2.5 Nominal Size - The nominal size of a bar shall be the dimensionof the diameter of round bars and side of square bars.2.6 Parcel - Any quantity of bars whether in coils or bundles, presentedfor examination and test at any one time.2.7 Ultimate Tensile Stress - The maximum load reached in atensile test clivi: ed by the original cro;s-sectional area of the gauge lengthportion of ihe test piece.2.8 Yield Stress - Stress ( that is, load per unit cross-sectional area )at which elongation first occurs in the test piece without increasing theload during tcn;ile test. In the case of steels with no such definite yieldpoint, the yield stress is the stress under the prescribed testing conditionsat \v lich the ohserv-ed increase in the gauge length is l/200 of the gaugelength when the rate at which the load applied is not more than 5N/mmjs when approaching the yield stress.3. TYPES AND GRADES3.1 Reinforcement supplied in accordance with this standard shall beclassified into the following types:

a) Mild stee bars, andb) Medium tcnrile steel bars.

3.1.1 Mild steel bars shall be supplied in the following two grades:a) Mild steel bars, Grade I; andb) Milcl steel bars, Grade II.

4. MANUFACTURE AND CHEMICAL COMPOSITION4.1 Steel for mild steel reinforcement bars, Grade I shall be manufacturedand have the chemical compositicn in accordance with the requirementsof Steel Designation Fe 410-S of JS : 226-1975*.4.2 Steel for mild steel reinforcement bars, Grade II shall be manu-factured and have the chemical composition in accordance with therequirements of Steel Designation Fe 410-O of IS : 1977-1975t.

*Specification for structural stc:rl ( standard quality ) ( jjlh recision .tSpecification for ztructural steel ( ordinary quality ) second recision ).5


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IS:432(PartI)-19824.3 Medium tensile steel bars shall be manufactured and have thechemical composition in accordance with the requirements of SteelDesignation Fe 540 \\--HT of IS : C61-1975*5. FREEDOM FROM DEFECTS5.1 All finished bars shall be well and cleanly rolled to the dimensicnsand weights specified. They shall be free from cracks, surface fla\\s,laminations and rough, jagged and imperfect edges and all other harmfuldefects,6. NOMINAL SIZES AND MASS6.1 Sizes - Mild steel and medium tensile steel bars shall be supplied inthe following nominal sizes:

Diameter of round bars or side 5, 6,8, 10, 12, 16, 20,22,25, 28,of square bars 32,36,40,45 and 50 mm6.2 Mass - The mass of bars shall be in accordance with IS : 1732-1971?.7. TOLERANCES7.1 The rolling and cutting tolerances shall be in accordance with IS :1852-1973$.8. PHYSICAL REQmMENTS8.1 The ultimate tensile stress, yield stress and percentage elongationwhen determined in accordance with 9.2 shall be as given in Table 1.8.2 The bars shall also withstand the bend test specified in 9.3.9. TESTS9.1 Selection and Preparation of Test Samples - Unless other-wise specified in this standard, the requirements of IS : 226-15753 shallapply.9.1.1 All test pieces of bars shail be selected by the purchaser or hisauthorized representative, either:

a) from the cutting of bars; or*Specification for structural steel ( high tewile ) ( zecondwrkion ).tDimensions for round and square steel bars for structural and general engineeringpurpose3 ( i;.rr fcciJion ) .$Specii%atio~n for rolling and cutting tolerances for hot-rolled steel products ( secomi

fmiJim ).pecification for structural steel ( standard quality ) (jj?h rmi.rion ).6


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IS : 432 Part I ) - 1982

TABLE I MECHANICAL PROPERTIES OF BARS

SL No. TYPE AND NOYR AL SIZEOF BAR

I. Mild Steel mdr IFor bars up to and including20 mmFor bars over 20 mm, up toand including 50 mm

2. Mild Steel Grade IIFor pmuz to and includingFor bars over 20 mm, up toand including 50 mm

3. M&urn 7caril.s S~cclFor l~~~;p to and includingFor bars over 16 mm, up toand including 32 mmFor bars over 32 mm, up toand Including 50 mm

( ClaUJI 8.1 )ULT~ATETENSILESTREBB,

Min

410410

370370

540540510

YIELD STRESS

Min

ELONaATION*PERCENT,

Min

250 23240 23

225215

350340330

2323

202020

*Elongation on a gauge length 5.65 c/ Sowhere So is the cross-sectional area of thetut piece.

b if he so desires, from any bar or the coil, after it has been cut tothe required or specified length and the test piece taken from anypart of it.9.1.1.1 In neither case, the test piece shall be detached from the baror the coil, except in the presence of the purchaser or his authorizedrepresentative.9.1.1.2 Before test pieces are selected, the manufacturer or suppliershall furnish the purchaser or his authorized representative with copies

of the mill records giving the number of bars in each cast with sizes aswell as the identification marks whereby the bars from their cast or eachcoil can be identified.7


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IS : 432 Part I ) - 19829.2 Tensile Test - The ultimate rensiie stres+, yield stress and elonga-tion of bars shall be determined in accordance with the requirements ofIS : l.608-19i2* read in conjunction lvith I5 : 226-1975t. The testpieces shall be cut from the finished material and straightened wherenecessary. They shall not be annealed or otherwise subjected 10 heattreatment. Any slight straightening lvhich may be required shal be donecold.

9.2.1 In case of bars, the size of which is not uniform rhrou$out thelength of test piece, limits shall be applied according to the actual maxi-mum thickness of the piece selected for testing.9.2.2 Should a tensile test piece break ontside the middle half of itsgauge length and the percentage elongation obtained is less than thatspecified, the test may be discarded at the manufacturers option, and

another test made from the same bar.9.3 Bend Test - The bend test .shall be performed in accordance withthe requirements of IS : 1599-1974: read in conjunction with 1s : 226-1975t.9.4 Retest - Should any one of the test pieces first selected fail to passany of the tests specified in this standard, t\vo further samples shall beselected for testing in respect of each failure. Should the test pieces fromboth these additional samples pass, the material represented by the testsamples shall be deemed to comply with the requireinents of that parti-cular test. Should the test piece from either of these additional samplesfail, the material represented by the test samples shall be considered asnot having complied with this standard.9.5 Sampling - Sampling for tensile and bend tests shall be in accdrd-ante with IS : 226-1975t.10. DELIVERY, INSPECTION AND TESTING FACILITIES10.1 Unless otherwise specified, general requirements relating to thesupply of material, inspection and testing shall conform to IS :, 1387-19675.10.2 Ko material shall be despatched from the manufacturers orsuppliers premises prior to its being certified by the purchaser or hirauthorized representative as having fulfil ed the tests and requirementslaid down in this standard except where the bundle or coil containingthe bars is marked with the IS1 Certification Mark.

*Method for tensile testing of steel products (fist rnisM ).Wpecification for structural steel ( standard quality ) ( j i fh revi sion .fblethod for bend test for steel products other than sheet, strip, wire and tube(first Wztiion .weneral requhements for therupply of metallurgical materials (/irsl rclfnr ).8


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IS : 432 ( Part I ) - 198210.3 The purchaser or his authorized representative shall be at libertyto inspect ,and verify the steel makers certificate of cast analysis at thepremises of the manufacturer or supplier; when the purchaser requiresan actual analysis of finished material, this shall be made at a placeagreed to between the purchaser and the manufacturer or supplier.10.4 Manufacturers Certificate -In the case of bars which havenot been inspected at the manufacturers works, the manufacturer orsupplier, as the case may be, shall supply the purchaser or his authorizedrepresentative with the certificate stating the process of manufactureand also the test sheet signed by the manufacturer giving the result ofeach mechanical test applicable to the material purchased, and thechemical composition, if required. Each test sheet shall indicate thenumber or identification mark of the cast to which it applies, corres-ponding to the number or identification mark to be found on thematerial.11. IDENTIFICATION AND MARKING11.1 The manufacturer or supplier shall have ingots, billets and bars orbundles of bars marked in such a way that all finished bars can be tracedto the cast from which they were made. Every facility shall be given tothe purchaser or his authorized representative for tracing the bars to thecast from which they were made.11.2 The medium tensile steel bars shall be suitably marked to identifythem from mild steel bars. Mild steel b ars Grade I and II shall havedistinctive identification tags.11.3 Each bundle or coil containing the bars may also be suitablymarked with the Standard Mark, in which case the concerned test arti-ficate shall also bear the Standard Mark.

NOTE -The use of the Standard Mark is governed by the provisions of theureau of Indian Standards Act, 1956 and the Rules and Regulations made there-under. The Standard Mark oa products covered by an Indian Standard conveysthe assurance that they have been produced to comply with the requirements of thatstandard under a well defined system of inspection, testing and quality controlwhich is devised and supervised by BIS and operated by the producer.. Standardmarked products are also continuously checked by BIS for conformity to thatstandard as a further safeguard. Details of conditions under which a license forthe use OF the Standard Mark may be granted to manufacturers or producers maybe obtained from the Bureau of Indian Standards.

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Is 432(Part-1) Specification for Mild Steel and Medium Tesil

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