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ASME Code - Allowable Stresses
  • Stress Values- Section II, Table 1A
  • Stress Values- Section II, Table 1B
  • Stress Values- Section II, Table 3
  • Carbon Steel - Example
  • High Alloy Steel - Example
Shells and Heads
  • Cylinder under internal pressure
  • Elliptical head under internal pressure
  • Torispherical head under internal pressure
  • Klöpperboden (DIN28011) under internal pressure
  • Korbbogenboden (DIN28013) under int. pressure
  • Hemispherical head under internal pressure
  • Flat head (circular) under internal pressure
  • Flat head (noncircular) under internal pressure
Flanges
  • Equivalent flange pressure due to ext. loads
  • Loose-type flange under internal pressure
  • ASME B16.5 Flanges
Determination of foming strains
  • Forming strain of a cylinder
  • Forming strain of a head
  • Forming strain of tube or pipe bends


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Some examples for allowable stress values "S" of typical stainless steels according to Section II, Part D, Table 1A, metric.

 
 

NB: Please use Section II Part D for all permitted ASME materials.

high alloy steel
Spec. No. SA-182 SA-182 SA-312 SA-312 SA-240 SA-240
Type/Grade F321 F316L TP316L TP316L 316Ti 304
Nominal Composition 18Cr-10Ni-Ti 16Cr-12Ni-2Mo 16Cr-12Ni-2Mo 16Cr-12Ni-2Mo 16Cr-12Ni-2Mo-Ti 18Cr-8Ni
Product Form forgings Forgings wld. pipe smls. & wld. pipe plate plate
Alloy Desig./UNS No. S32100 S31603 S31603 S31603 S31635 S30400
Size/Thickness [mm] ≤ 125 ≤ 125 - - - -
P-No. 8 8 8 8 8 8
Group No. 1 1 1 1 1 1
Min. Tensile
Strength
[MPa]
515 485 485 485 515 515
Min. Yield
Strength
[MPa]
205 170 170 170 205 205
I-Applic. and Max. Temp. Limit
[°C]
816 454 454 454 NP 816
III-Applic. and Max. Temp. Limit [°C] NP NP NP 427 NP 427
VIII-1-Applic. and Max. Temp. Limit [°C] 816 454 454 454 816 816
XII-Applic. and Max. Temp. Limit [°C] 343 343 343 343 343 343
External Pressure
Chart No.
HA-2 HA-4 HA-4 HA-4 HA-2 HA-1
Notes G12, T7 G21 G5, G21, G24 G5, G21, W12 W14 G5, G12, T8 G5, G12, H1, T7
-30 to 40°C [MPa] 138 115 97.9 115 138 138
≤ 65°C [MPa] 130 106 97.9 115 138 138
≤ 100°C [MPa] 123 96.3 97.9 115 138 137
≤ 125°C [MPa] 118 91.3 97.9 115 138 134
≤ 150°C [MPa] 114 87.4 97.9 115 138 130
≤ 200°C [MPa] 106 81.2 93.0 109 134 126
≤ 250°C [MPa] 99.7 76.0 87.2 103 125 122
≤ 300°C [MPa] 94.5 72.5 82.9 98.0 117 116
≤ 325°C [MPa] 92.3 71.2 81.6 95.7 116 114
≤ 350°C [MPa] 90.7 70.0 80.2 94.1 114 111
≤ 375°C [MPa] 89.4 68.8 78.4 92.8 112 109
≤ 400°C [MPa] 87.5 67.5 77.2 90.9 111 107
≤ 425°C [MPa] 68.9 66.3 75.9 89.0 110 105
≤ 450°C [MPa] 85.7 65.0 74.7 87.8 109 103
≤ 475°C [MPa] 85.0 63.8 73.4 86.6 108 101
≤ 500°C [MPa] 83.9 - - - 107 99.3
≤ 525°C [MPa] 83.0 - - - 106 98.0
≤ 550°C [MPa] 77.6 - - - 105 93.3
≤ 575°C [MPa] 59.2 - - - 99.8 79.6
≤ 600°C [MPa] 44.8 - - - 80.3 65.4
≤ 625°C [MPa] 32.9 - - - 65.5 51.4
≤ 650°C [MPa] 24.5 - - - 50.4 41.7
≤ 675°C [MPa] 18.3 - - - 38.6 32.9
≤ 700°C [MPa] 12.6 - - - 29.6 26.5
≤ 725°C [MPa] 8.41 - - - 23.0 21.3
≤ 750°C [MPa] 6.18 - - - 17.7 17.2
≤ 775°C [MPa] 4.37 - - - 13.4 13.9
≤ 800°C [MPa] 2.77 - - - 10.4 11.1
≤ 825°C [MPa] 1.62 - - - 8.05 8.73

Notes

(b)

for interpolation consider General Notes (b):
The stress values in this Table may be interpolated to determine values for intermediate temperatures. The values at intermediate temperatures shall be rounded to the same number of decimal places as the value at the higher temperatur between which values are being interpolated.The rounding rule is:
when the next digit beyond the last place to be retained is less than 5, retain unchanged the digit in the last place retained; when the digit next beyond the last place to be retained is 5 or greater, increase by 1 the digit in the last place retained.

G5

Due to the relatively low yield strength of these materials, these higher stress values were established at temperatures where the short – time tensile properties govern to permit the use of these alloys where slightly greater deformation is acceptable. The stress values in this range exceed 66 2/3 % but do not exceed 90% of the yield strength at temperature. Use of these stresses may result in dimensional changes due to permanent strain. These stress values are not recommended for the flanges of gasketed joints or other applications where slight amounts of distortion can cause leakage or malfunction. For Section III applications, Table Y – 2 lists multiplying factors that, when applied to the yield strength values shown in Table Y – 1, will give allowable stress values that will result in lower levels of permanent strain.

G10

Upon prolonged exposure to temperatures above 425°C, the carbide phase of carbon steel may be converted to graphite. See Nonmandatory Appendix A, A – 201 and A – 202.

G12

At temperatures above 550°C, these stress values apply only when the carbon is 0.04% or higher on heat analysis.

G21

For Section I, use is limited to PEB – 5.3. See PG – 5.5 for cautionary note.

G24

A factor of 0.85 has been applied in arriving at the maximum allowable stress values in tension for this material. Divide tabulated values by 0.85 for maximum allowable longitudinal tensile stress.

H1

For temperatures above 550°C, these stress values may be used only if the material is heat treated by heating to the minimum temperature specified in the material specification, but not lower than 1040°C, and quenching in water or rapidly cooling by other means.

S1

For Section I applications, stress values at temperatures of 450°C and above are permissible but, except for tubular products 75 mm O.D. or less enclosed within the boiler setting, use of these materials at these temperatures is not current practice.

T1

Allowable stresses for temperatures of 370°C and above are values obtained from time – dependent properties.

T2

Allowable stresses for temperatures of 400°C and above are values obtained from time – dependent properties.

T7

Allowable stresses for temperatures of 565°C and above are values obtained from time – dependent properties.

T8

Allowable stresses for temperatures of 595°C and above are values obtained from time – dependent properties.

T9

Allowable stresses for temperatures of 620°C and above are values obtained from time – dependent properties.

W12

These S values do not include a longitudinal weld efficiency factor. For Section III applications, for materials welded without filler metal, ultrasonic examination, radiographic examination, or eddy current examination, in accordance with NC – 2550, shall provide a longitudinal weld efficiency factor of 1.00. Materials welded with filler metal meeting the requirements of NC – 2560 shall receive a longitudinal weld efficiency factor of 1.00. Other longitudinal weld efficiency factors shall be in accordance with 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) for single or double butt weld, with radiography, 1.00

W14

These S values do not include a weld factor. For Section VIII, Division 1, and Section XII 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 for Section VIII, Division 1, or TW – 130.4 for Section XII, as applicable.

General Information

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The stress values of the exemplary materials shown here are intended to be used for information and guidance only. They do not replace the use of the tables in ASME Code Section II, Part D and due consideration of all applicable notes. CIS GmbH expressly disclaims liability for errors and omissions in the contents of this site.

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