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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
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  • 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 carbon steels according to Section II, Part D, Table 1A, metric.

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

carbon steel
Spec. No. SA-105 SA-106 SA-516 SA-516 SA/EN 10028-2 SA/EN 10216-2
Type/Grade - B 60 70 P265GH P235GH
Nominal Composition carbon steel carbon steel carbon steel carbon steel carbon steel carbon steel
Product Form forgings smls. pipe plate plate plate smls. tube
Alloy Desig./UNS No. K03504 K03006 K02100 K02700 - -
Size/Thickness [mm] - - - - ≤ 60 t ≤ 16
16 < t ≤ 40
40 < t ≤ 60
P-No. 1 1 1 1 1 1
Group No. 2 1 1 2 1 1
Min. Tensile
Strength
[MPa]
485 415 415 485 410 360
Min. Yield
Strength
[MPa]
250 240 220 260 245 215
I-Applic. and Max. Temp. Limit
[°C]
538 538 454 454 NP 538
III-Applic. and Max. Temp. Limit [°C] 371 371 371 371 NP NP
VIII-1-Applic. and Max. Temp. Limit [°C] 538 538 538 538 371 538
XII-Applic. and Max. Temp. Limit [°C] 343 343 343 343 NP NP
External Pressure
Chart No.
CS-2 CS-2 CS-2 CS-2 CS-2 CS-2
Notes G10, S1, T2 G10, S1, T1 G10, S1, T2 G10, S1, T2 T1 G10, S1, T2, W14
-30 to 40°C [MPa] 138 118 118 138 117 103
≤ 65°C [MPa] 138 118 118 138 117 103
≤ 100°C [MPa] 138 118 118 138 117 103
≤ 125°C [MPa] 138 118 118 138 117 103
≤ 150°C [MPa] 138 118 118 138 117 103
≤ 200°C [MPa] 138 118 118 138 117 103
≤ 250°C [MPa] 136 118 118 138 117 103
≤ 300°C [MPa] 129 118 115 136 117 103
≤ 325°C [MPa] 125 118 112 132 117 103
≤ 350°C [MPa] 122 117 108 128 117 103
≤ 375°C [MPa] 117 105 104 123 106 102
≤ 400°C [MPa] 101 88.9 88.9 101 - 89.1
≤ 425°C [MPa] 83.9 75.3 75.3 83.8 - 75.4
≤ 450°C [MPa] 67.0 62.7 62.7 67.1 - 62.6
≤ 475°C [MPa] 51.1 45.5 45.5 51.0 - 45.5
≤ 500°C [MPa] 33.6 31.6 31.6 33.6 - 31.6
≤ 525°C [MPa] 21.3 21.9 21.9 21.3 - 21.9
≤ 550°C [MPa] 12.9 12.7 12.7 12.9 - 12.7
≤ 575°C [MPa] - - - - - -
≤ 600°C [MPa] - - - - - -
≤ 625°C [MPa] - - - - - -
≤ 650°C [MPa] - - - - - -
≤ 675°C [MPa] - - - - - -
≤ 700°C [MPa] - - - - - -
≤ 725°C [MPa] - - - - - -
≤ 750°C [MPa] - - - - - -
≤ 775°C [MPa] - - - - - -
≤ 800°C [MPa] - - - - - -
≤ 825°C [MPa] - - - - - -

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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