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CASE 2504CASES OF ASME BOILER AND
PRESSURE VESSEL CODE
Approval Date: .
Case 2504
Use of SA-240, 16Cr-4Ni-6Mn, Type 201LN (UNS S20153)Plate, Sheet, and Strip for Pressure Vessels
Section VIII, Divisions 1 and 2, and Section XII
Inquiry: Under what conditions may SA-240 UNS S20153 plate, sheet, and strip be used in the
manufacture of Section VIII, Divisions 1 and 2 and Section XII welded pressure vessels?
Reply: It is the opinion of the Committee that SA-240 UNS S20153 may be used for the manufacture
of Section VIII, Divisions 1 and 2, and Section XII welded pressure vessels provided the following
additional requirements are met.
(a) The heat treatment requirements are given in SA-480.(b) The minimum design temperature shall be -320F (-196C). The maximum design temperature
shall be +800F (+427C) for Section VIII Divisions 1 and 2, and +650F (+343C) for Section XIIservice.
(c) The maximum allowable stress and design stress intensity values shall be as shown in Tables 1,2, 3, and 4.
(d) For Section VIII, Division 2, all cold formed heads shall be reheat-treated in accordance with (a)above and all other cold formed materials subjected to an extreme fiber elongation of more than4% as determined by AF-605(a) shall be reheat-treated in accordance with (a) above.
(e) For Section XII construction the rules of Article TF-4 shall be met.(f) For external pressure use Fig. CS-2, Section II, Part D.(g) This Case number shall be shown on the Manufacturer's Data Report.
TABLE 1MAXIMUM ALLOWABLE STRESS VALUES,SECTION VIII DIVISION 1 AND SECTION XII
For MetalTemperature
Not Exceeding,F
Allowable Stress Values, ksi
100 27.1 27.1
200 23.7 24.2 [Note (1)]
300 21.2 21.9 [Note (1)]
400 20.1 20.7 [Note (1)]
500 19.7 20.0 [Note (1)]
600 19.2 19.6 [Note (1)]650 18.6 19.6 [Note (1)]
700 18.0 19.4 [Note (1)]
750 17.4 19.2 [Note (1)]
800 16.7 18.8 [Note (1)]
Note 1. See Note G5 of Table 1A in Section II, Part D.
General Note: The revised criterion of 3.5 on tensile strength was used in establishing Section VIII-1 andXII values.
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TABLE 2DESIGN STRESS INTENSITY AND YIELD
STRENGTH VALUES, SECTION VIII DIVISION 2
For MetalTemperature
Not Exceeding,F
Yield StrengthValues, Sy, ksi
Design StressIntensity values
Sm, ksi
100 45.0 30.0200 36.3 27.6 (Note 2)
300 32.9 24.7 (Note 2)
400 31.1 23.4 (Note 2)
500 30.0 23.0 (Note 2)
600 28.7 22.9 (Note 2)
650 27.9 22.8 (Note 2)
700 27.0 22.6 (Note 2)
750 26.0 22.3 (Note 2)
800 25.1 22.0 (Note 2)
Note 2. See Note G7 of Table 2A in Section II, Part D..
TABLE 3MAXIMUM METRIC ALLOWABLE STRESS VALUES,
SECTION VIII DIVISION 1 AND SECTION XII
For MetalTemperature
Not Exceeding,C
Allowable Stress Values, Mpa
40 187 187
65 177 179 (Note 3)
100 161 164 (Note 3)
125 152 157 (Note 3)
150 146 151 (Note 3)
175 142 147 (Note 3)200 139 143 (Note 3)
225 137 141 (Note 3)
250 136 139 (Note 3)
275 136 136 (Note 3)
300 134 136 (Note 3)
325 131 135 (Note 3)
350 127 135 (Note 3)
375 124 134 (Note 3)
400 120 132 (Note 3)
425 115 130 (Note 3)
450(Note 4)
112 128 (Note 3)
Note 3. See Note G5 of Metric Table 1A in Section II, Part D
Note 4. The Maximum use temperature for this grade is 427C,and the value at 450C is provided for interpolationpurposes only.
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TABLE 4METRIC DESIGN STRESS INTENSITY VALUES AND
YIELD STRENGTH VALUES, SECTION VIII DIVISION 2
For MetalTemperature
Not Exceeding,
C
Yield StrengthValues, Sy, MPa
Design StrengthIntensity Values,
Sm, MPa
40 310 207
65 269 206 (Note 5)
100 248 187 (Note 5)
125 235 177 (Note 5)
150 226 170 (Note 5)
175 220 165 (Note 5)
200 215 162 (Note 5)
225 211 160 (Note 5)
250 208 159 (Note 5)
275 205 158 (Note 5)
300 201 158 (Note 5)
325 196 158 (Note 5)
350 191 157 (Note 5)
375 185 156 (Note 5)
400 179 154 (Note 5)
425 173 152 (Note 5)
450(Note 6)
168 149 (Note 5)
Note 5. See Note G7 of Metric Table 2A in Section II, Part D.
Note 6. The Maximum use temperature for this grade is 427C,and the value at 450C is provided for interpolationpurposes only.