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HAYNES® Alloys

ASME Vessel Code

HAYNES® 556® alloy is approved for ASME Vessel Code Section I construction to 1200°F (650°C) under Code Case No. 2010 and Section VIII Division 1 construction to 1650°F (900°C). Allowable stresses are reprinted here by permission of the ASME.

ASME Vessel Section II, Part D, Table 1B
Customary Metric
Metal Temperatures Not Exceeding Maximum Allowable Stress Values Metal Temperatures Not Exceeding Maximum Allowable Stress Values
Standard Note (1) Standard Note (1)
°F ksi ksi °C MPa MPa
100 28.6 28.6 40 197 197
200 25.6 28.6 65 187 197
300 23.1 28.0 100 174 197
400 21.3 27.1 125 166 195
500 20.1 26.4 150 159 193
600 19.3 26.0 175 153 190
650 18.9 25.6 200 148 187
700 18.7 25.2 225 143 185
750 18.4 24.9 250 140 183
800 18.2 24.6 275 137 181
850 18.0 24.3 300 135 180
900 17.8 24.1 325 132 178
950 17.6 23.8 350 130 176
1000 17.5 23.6 375 129 173
1050 17.3 23.3 400 127 172
1100 17.1 21.2 425 126 170
1150 16.9 17.0 450 124 168
1200 13.6 13.6 475 123 167
1250 10.9 10.9 500 122 165
1300 8.8 8.8 525 121 163
1350 7.0 7.0 550 120 162
1400 5.6 5.6 575 119 158
1450 4.5 4.5 600 118 140
1500 3.6 3.6 625 115 115
1550 2.7 2.7 650 93.0 93.0
1600 2.1 2.1 675 76.1 76.1
1650 1.6 1.6 700 62.9 62.9
- - - 725 51.3 51.3
- - - 750 41.8 41.8
- - - 775 34.3 34.3
- - - 800 28.3 28.3
- - - 825 22.6 22.6
- - - 850 17.4 17.4
- - - 875 14.0 14.0
- - - 900 10.9 10.9

NOTE(1)
Due to the relatively low yield strength of this material, 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. These higher stress values exceed 67%, but do not exceed 90% of the yield strength at temperature. Use of these stress values may result in dimensional changes due to permanent strain. These stress values are not recommended for flanges of gasketed joints or other applications where slight amounts of distortion can cause leakage or malfunction.

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