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Creep and Stress-Rupture Strength

HAYNES® 25 alloy is a solid-solution-strengthened material which possesses excellent high-temperature strength. It is particularly effective for very long-term applications at temperatures of 1200 to 1800°F (650 to 980°C). It is stronger than nickel-base solid-solution-strengthened alloys, and is the strongest of the cobalt-base materials which still have good fabrication characteristics.

Solution-Annealed Sheet*

Temperature Creep Approximate Initial Stress to Produce Specified Creep in
10 h 100 h 1,000 h
°F °C % ksi MPa ksi MPa ksi MPa
1200 649 0.5 62.0 427 47.5 328 33.5** 231**
1 71.0 490 54.0 372 39.0** 269**
R 82.0 565 69.0 476 57.0 393
1300 704 0.5 43.0 296 30.0** 207** 21.0** 145**
1 49.5 341 35.0 241 23.2** 160**
R 64.0 441 50.0 345 38.0 262
1400 760 0.5 28.0 193 19.5 134 14.8** 102**
1 32.0 221 21.5 148 16.2** 112**
R 47.0** 324** 36.0 248 26.0 179
1500 816 0.5 18.5 128 14.0 97 10.2** 70**
1 20.2 139 15.5 107 12.3** 85**
R 34.0** 234** 24.7 170 18.1 125
1600 871 0.5 13.7 94 9.9 68 6.9** 48**
1 15.2 105 12.0 83 8.9** 61**
R 24.0** 165** 17.5 121 12.0 83
1700 927 0.5 9.7 67 6.8 47 4.5** 31**
1 12.0 83 8.8 61 5.6 39
R 17.3** 119** 11.8 81 7.2 50
1800 982 0.5 6.8 47 4.5 31 2.6 18
1 8.8 61 5.6 39 3.0 21
R 11.8** 81** 7.2 50 4.0 28
2000 1093 0.5 2.8 19 1.3 9.0 - -
1 3.3 23 1.4 9.7 - -
R 4.5 31 2.0 14 - -

*Based on limited data
**Significant extrapolation

Solution-Annealed Bar

Temperature Approximate Initial Stress to Produce Rupture in
10 h 100 h 1,000 h
°F °C ksi MPa ksi MPa ksi MPa
1350 732 42.5 293 36.5 252 30.3 209
1400 760 39.2 270 31.5 217 24.1 166
1500 816 30.0 207 22.0 152 17.0 117
1600 871 23.0 159 16.5 114 12.0 83
1700 927 17.0 117 12.0 83 8.4 58
1800 982 11.5 79 7.5 52 5.0 34

Comparative Rupture Strength, Sheet

25 Creep graph

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