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Creep and Stress-rupture Strength

HAYNES® 230® 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, and is capable of outlasting stainless steels and nickel alloys by as much as 100 to 1 depending upon the temperature. Alternatively, the higher strength of 230® alloy allows for the use of design section thicknesses as much as 75 percent thinner than lesser alloys with no loss in load-bearing capability.

Stress-Rupture Lives for Various Alloys at Fixed Test Conditions (Bar and Plate)*

Alloy Hours to Rupture
1400°F (760°C) 1600°F (871°C) 1800°F (982°C)
- 15.0 ksi (103 MPa) 4.1 ksi (31 Mpa) 2.0 ksi (14 Mpa)
230® 8,200 65,000 5,000
625 19,000 14,000 2,400
X 900 5,000 2,100
800H 130 1,200 920
INCONEL® 601 50 1,200 1,000
253 MA® 140 900 720
600 15 280 580
316 SS 100 240 130
RA330® 30 230 130
304 SS 10 100 72

*Based upon Larson-Miller extrapolation

Comparison of Stress to Produce 1% Creep in 1000 Hours (Sheet)

230 - Comparison of Stress to Produce 1% Creep in 1000 Hours (Sheet)

230® Sheet, Solution Annealed

Temperature Creep Approximate Initial Stress to Produce Specified Creep in
10 Hours 100 Hours 1,000 Hours 10,000 Hours
°F °C % ksi MPa ksi MPa ksi MPa ksi MPa
1200 649 0.5 - - 31 214 - - - --
1 - - 35 241 24* 165* - --
R - - 51 352 36 248 28 193
1300† 704 0.5 29 200 21 145 14.5 100 - --
1 33 228 23 159 17 114 - --
R 47 324 34 234 26 179 20 134
1400 760 0.5 19.2 132 13.7 94 9.6 66 7.3 50
1 21 145 15.5 107 11.5 79 8.6 59
R 32 221 24.5 169 18.2 125 13.2* 91*
1500 816 0.5 14.2 98 10.3 71 7.5 52 5.4* 37*
1 15 103 11.2 77 8.6 59 6.5* 45*
R 23* 161* 17.5 121 12.5 86 8.4* 58*
1600 871 0.5 11.3 78 8.1 56 5.7 39 4.0 28
1 11.7 81 9.0 62 6.2 43 4.3 30
R 17.0 117 12.5 86 8.2 57 5.6* 39*
1700 927 0.5 7.7 53 5.5 38 3.8 26 2.4* 17*
1 8.8* 61* 6.2 43 4.2 29 2.7* 19*
R 12.0* 83* 8.0 55 5.1 35 3.2 22
1800 982 0.5 7.0 48 3.6 25 1.8 12 0.85 5.9
1 8.0 55 4.1 28 2.0 14 1.0 6.9
R 10.0 69 5.4 37 2.6 18 1.2* 8.3*
1900 1038 0.5 - - 1.7 12 0.8 5.5 - --
1 - - 2.0 14 0.9 6.2 - --
R - - 3.0* 21* 1.5 10 - --
2000 1093 0.5 - - - - - - - --
1 - - 0.9 6.2 - - - --
R - - - - - - - --

*Significant extrapolation
† Values obtained using Larson-Miller interpolation

230® Plate, Solution Annealed

Temperature Creep Approximate Initial Stress to Produce Specified Creep in
10 Hours 100 Hours 1,000 Hours 10,000 Hours
°F °C % ksi MPa ksi MPa ksi MPa ksi MPa
1200 649 0.5 - - 35 241 23 159 - -
1 - - 39 269 26.5 183 17.5 121
R 75 517 56 386 41 283 29 200
1300 704 0.5 35 241 21.5 148 14.5 100 - -
1 39 269 24.5 169 18 124 12.3* 85*
R 59 407 42 290 30 207 21 145
1400 760 0.5 19 131 13.5 93 10.0 69 - -
1 23 159 15.9 110 11.5 79 9.0* 62*
R 37 255 27 186 20 138 14.2 98
1500 816 0.5 14.0 97 10.4 72 8.2 57 6.1 42
1 16.5 114 12.5 86 9.5 66 6.9 48
R 26 179 20 138 14.0 97 9.8 68
1600 871 0.5 10.3 71 7.6 52 5.6 39 4.0 28
1 11.7 81 9.0 62 6.2 43 4.3 30
R 20 138 13.7 94 9.5 66 6.2 43
1700 927 0.5 7.8 54 5.7 39 3.9 27 2.5 17
1 8.8 61 6.8 47 4.5 31 2.7 19
R 15.0 103 10.0 69 6.0 41 3.6 25
1800 982 0.5 5.8 40 3.5 24 1.8 12 0.90 6.2
1 6.3 43 4.0 28 2.1 14 1.1 7.6
R 9.4 65 6.0 41 3.2 22 1.7 12
1900 1038 0.5 4.0 28 2.0 14 0.90 6.2 - -
1 4.4 30 2.2 15 1.0 6.9 0.50* 3.4*
R 7.0 48 3.7 26 1.8 12 1.0 6.9
2000 1093 0.5 1.9 13 0.80 5.5 0.35 2.4 - -
1 2.3 16 1.0 6.9 0.47 3.2 0.20* 1.4*
R 4.2 29 2.1 14 1.0 6.9 0.55 3.8
2100 1149 0.5 0.80 5.5 0.03* 2.1* - - - -
1 1.0 6.9 0.43 3.0 - - - -
R 2.3 16 1.2 8.3 0.60 4.1 - -

*Significant extrapolation

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