Division 1 Material Notes for Table 1B

8/12/2019 Division 1 Material Notes for Table 1B

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Division 1 Material Notes for Table 1B: Back to Top

(a) The following abbreviations are used: ann., annealed; Applic., Applicability; Cond., Condition; cond., condenser; Desig.,Designation; exch., exchanger; extr., extruded; fin., finished;fr., from; rel., relieved; rld., rolled; Smls., Seamless; Sol.,Solution; treat., treated; and Wld., Welded.

(b) The stress values in this Table may be interpolated todetermine values for intermediate temperatures.

(c) When used for Section III Class MC design, the stress valueslisted herein shall be multiplied by a factor of 1.1 (NE-3112.4);these values shall be considered as design stress intensities orallowable stress values as required by NE-3200 or NE-3300,respectively.

(d) For Section VIII applications, stress values in restricted shear,

such as dowel bolts, rivets, or similar construction in which theshearing is so restricted that the section under considerationwould fail without reduction of areas, shall be 0.80 times thevalues in this table.

(e) For Section VIII applications, stress values in bearing shall be1.60 times the values in this Table.

G1 For steam at 250 psi (406F), the values given for 400F may beused.

G2 At temperatures over 1000F, these stress values apply onlywhen the carbon is 0.04% or higher.


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G3 In the absence of evidence that the casting is of high qualitythroughout, values not in excess of 80% of those given in theTable shall be used. This is not intended to apply to valves andfittings made to recognized standards.

G4 For Section I applications, this material may not be used forparts of firetube boilers under external pressure.

G5 Due to the relatively low yield strength of these materials,these higher stress values were established at temperatureswhere the short time tensile properties govern to permit theuse of these alloys where slightly greater deformation isacceptable. The stress values in this range exceed 66 2/3 % butdo not exceed 90% of the yield strength at temperature. Use ofthese stresses may results in dimensional changes due topermanent strain. These stress values are not recommendedfor the flanges of gasketed joints or other applications whereslight amounts of distortion can cause leakage or malfunction.Table Y-2 lists multiplying factors which, when applied to theyield strength values shown in table Y-1, will give allowablestress values that will result in lower values of permanentstrain.

G6 Maximum temperature for external pressure not to exceed350F.

G7 Use 350F curve for all temperature values below 350F.

G8 Use Fig. NFC-3 for temperatures above 300F up to andincluding 400F.

G9 Use Fig. NFC-4 up to and including 350F. Use the 600F curveof Fig. NFC-3 above 350F up to and including 400F. Maximumtemperature for external pressure not to exceed 400F.


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G10 Maximum temperature for external pressure not to exceed450F.

G11 Referenced external pressure chart is applicable up to 700F.

G12 Referenced external pressure chart is applicable up to 800F.

G13 For Section VIII applications, use of external pressure chartsfor material in the form of barstock is permitted for stiffeningrings only.

G14 A factor of 0.85 has been applied in arriving at the maximumallowable stress values in tension for this material. Dividetabulated values by 0.85 for maximum allowable longitudinal

tensile stress.

G15 To these stress values a quality factor as specified in SectionIII, ND-3115 or UG-24 of Section VIII, Division 1 shall beapplied for castings. This is not intended to apply to valves andfittings made to recognized standards.

G16 Allowable stress values shown are 90% of those for thecorresponding core material.

G17 Copper-silicon alloys are not always suitable when exposed tocertain media and high temperatures, particularly steam above212F. The user should ensure that the alloy selected issatisfactory for the service for which it is to be used.

G18 Because of the occasionally contingent danger from the failureof pressure vessels by stress corrosion cracking, the following ispertinent. These materials are suitable for engineering useunder a wide variety of ordinary corrosive conditions with no


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particular hazard in respect to stress corrosion.

G19 Few alloys are completely immune to stress corrosion crackingin all combinations of stress and corrosive environments andthe supplier of the material should be consulted. Referencemay also be made to the following sources: (1) Stress CorrosionCracking Control Measures B.F. Brown, U.S. National Bureauof Standards (1977), available from NACE, Texas; (2) TheStress Corrosion of Metals, H.L. Logan, John Wiley and Sons,New York, 1966.

G20 For plate only.

G21 The maximum operating temperature is arbitrarily set at 500Fbecause harder temper adversely affects design stress in the

creep rupture temperature range.

G22 The minimum tensile strength of reduced tension specimens inaccordance with QW-462.1 of Section IX shall not be less than110,000 psi.

G23 Alloy N06625 in the annealed condition is subject to severe lossof impact strength at room temperatures after exposure in therange of 1000F to 1400F.

G24 For stress relieved tempers (T351, T3510, T3511, T451, T4510,T4511, T651, T6510, T6511), stress values for materials in thebasic temper shall be used.

G25 The tension test specimen from plate 0.500 in. and thicker ismachined from the core and does not include the claddingalloy; therefore, the allowable stress values for thickness lessthan 0.500 in. shall be used.


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G26 The tension test specimen from plate 0.500 in. and thicker ismachined from the core and does not include the claddingalloy; therefore, the allowable stress values shown are 90% ofthose for the core material of the same thickness.

G27 Alloy N06022 in the solution annealed condition is subject tosevere loss of impact strength at room temperatures afterexposure in the range of 1000F to 1250F.

G28 For external pressure design, the maximum designtemperature is limited to 1000F.

G29 Creep-fatigue, thermal ratcheting, and environmental effectsare increasingly significant failure modes at temperatures inexcess of 1500F and shall be considered in the design.

H1 For temperatures above 1000F, these stress values may be

used only if the material is annealed at a minimumtemperature of 1900F and has a carbon content of 0.04% orhigher.

H2 For temperatures above 1000F, these stress values may beused only if the material is heat treated by heating it to aminimum temperature of 1900F and quenching in water orrapidly cooling by other means.

T1 Allowable stresses for temperatures of 250F and above arevalues obtained from time-dependent properties.

T2 Allowable stresses for temperatures of 300F and above arevalues obtained from time dependent properties.



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T11 Allowable stresses for temperatures of 900F and above are

values obtained from time dependent properties.




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W5 These S values do not include a longitudinal weld efficiencyfactor. For Section III applications, for materials weldedwithout filler metal, ultrasonic examination, radiographicexamination, or eddy current examination, in accordance withNC 2550, shall provide a longitudinal weld efficiency factor of1.0. Other long. weld efficiency factors shall be in accordancewith the following: (a) for single butt weld, with filler metal,0.80; (b) for single or double butt weld, without filler metal,0.85; (c) for double butt weld, with filler metal, 0.90; (d) forsingle or double butt weld, with radiography, 1.00.

W6 Filler metal shall not be used in the manufacture of weldedpipe or tubing.

W7 Strength of reduced-section tensile specimen required toqualify welding procedures. See QW-150, Section IX.

W8 After welding, heat treat at 1150-1200F, hold 1-1/2 hr attemperature for the first inch of cross-section thickness and 1/2hr for each additional inch, and air cool. For castings used inpumps, valves, and fittings 2 in. nominal pipe size and less,PWHT is not required for socket welds and attachment weldswhen the castings have been temper annealed at 1150 to1200F prior to welding.

W9 If welded or brazed, the allowable stress values for theannealed condition shall be used and the minimum tensile

strength of the reduced tension specimen in accordance withQW-462.1 of Section IX shall not be less than 30.0 ksi.

W10 When nonferrous materials conforming to specifications inSection II, Part B are used in welded or brazed construction,the maximum allowable working stresses shall not exceed thevalues given herein for annealed material at the metaltemperature shown.


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W11 These maximum allowable stress values are to be used inwelded or brazed constructions.

W12 These S values do not include a weld factor. For Section VIII,Division 1 applications using welds made without filler metal,the tabulated tensile stress values shall be multiplied by 0.85.For welds made with filler metal, consult UW-12 of Section

VIII, Division 1.

W13 For service at 1200F or higher, the deposited weld metal shallbe of the same nominal chemistry as the base metal.

Division 1 Material Notes for Table 1B

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