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Creep and Stress-Rupture Strength

HAYNES 188 alloy is a solid-solution- strengthened material which combines excellent high-temperature strength with good fabricability at room temperature. It is particularly effective for very long-term applications at temperatures of 1200°F (650°C) or more. It is stronger than nickel-base solid-solution-strengthened alloys, and far stronger than simple nickel chromium or iron-nickel-chromium heat-resistant alloys. This can allow for significant section thickness reduction when it is substituted for these materials.

Comparision of Sheet Materials: Stress to Produce 1% Creep in 1000 Hours

188 - COMPARISON OF SHEET MATERIALS: STRESS TO PRODUCE 1% CREEP IN 1000 HOURS

188 Plate, Solution-Annealed

Temperature Creep Approximate Initial Stress to Produce Specified Creep in
10 h 100 h 1,000 h 10,000 h
°F °C % ksi MPa ksi MPa ksi MPa ksi MPa
1200 649 0.5 -- -- -- -- -- -- -- --
1 -- -- -- -- 35* 241* -- --
R -- -- 78 538 59 407 45* 310*
1300 704 0.5 41 283 28 193 18* 124* -- --
1 44 303 31.5 217 22 152 -- --
R 73* 503* 54 372 40 276 28 193
1400 760 0.5 26 179 17 117 11.5 79 -- --
1 29 200 20.5 141 14.5* 100* -- --
R 51 352 37 255 26 179 18.5* 128*
1500 816 0.5 16 110 11.0 76 7.7* 53* -- --
1 19 131 13.5 93 9.3 64 -- --
R 36 248 25 172 17.5 121 12.0 83
1600 871 0.5 11.5 79 7.5 52 5.5* 38* -- --
1 13.0 90 9.0 62 6.4* 44* -- --
R 25 172 17.0 117 11.6 80 7.8 54
1700 927 0.5 8.0 55 5.2 36 3.6* 25* -- --
1 9.2 63 6.0 41 4.3* 30* -- --
R 16.5 114 11.1 77 7.3 50 4.5* 31*
1800 982 0.5 5.6 39 3.6 25 2.3 16 1.35 9.3
1 6.3 43 4.2 29 2.5 17 1.42 9.8
R 11.5 79 7.0 48 4.0 28 2.2* 15*
1900 1038 0.5 3.7 26 2.3* 16* -- -- -- --
1 4.2 29 2.5* 17* -- -- -- --
R 7.2* 50* 4.4 30 2.2* 15* -- --
2000 1093 0.5 2.3 16 1.35 9.3 -- -- -- --
1 2.6 18 1.42 9.8 -- -- -- --
R 4.7 32 2.3 16 1.10* 7.6* -- --

*Significant extrapolation

188 Sheet, Solution-Annealed

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
1400 760 0.5 22.5 155 16.4 113 11.7 81
1 25.5 176 18.5 128 13.3 92
R 43.0* 296* 32.0 221 23.0 159
1500 816 0.5 15.5 107 11.1 77 7.8 54
1 17.6 121 12.6 87 8.8 61
R 31.0 214 21.7 150 15.0 103
1600 871 0.5 10.7 74 7.5 52 5.0 34
1 12.2 84 8.4 58 5.7 39
R 21.0 145 14.4 99 9.4 65
1700 927 0.5 7.3 50 4.9 34 3.1 21
1 8.2 57 5.6 39 3.6 25
R 14.3 99 9.1 63 5.5* 38*
1800 982 0.5 4.9 34 3.1 21 1.8 12
1 5.6 39 3.6 25 2.1 14
R 9.1 63 5.4 37 3.0 21
1900 1038 0.5 3.1 21 1.9 13 1.2 8.3
1 3.6 25 2.2 15 1.4 9.7
R 5.5 38 3.2 22 2.0 14
2000 1093 0.5 2.0* 14* 1.2 8.3 0.70 4.8
1 2.3* 16* 1.4 9.7 0.90 6.2
R 3.3* 23* 2.0 14 1.2 8.3

*Significant extrapolation

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