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HAYNES® Alloys

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)

Sheet - 2250°F (1232°C) Solution Anneal

Test Temperature Creep Approximate Initial Stress to Produce Specified Creep in:
°F °C % 10 h 100 h 1000 h 10,000 h*
ksi MPa ksi MPa ksi MPa ksi MPa
1200 649 0.5 48.0 330 32.0 220 22.0 150 - -
1.0 51.0 350 36.0 250 25.0 170 - -
Rupture 67.0 460 48.0 330 36.0 250 27.0 185
1300 704 0.5 31.0 215 21.3 145 14.5 100 - -
1.0 34.0 235 24.0 165 16.5 115 - -
Rupture 47.0 325 34.0 235 25.0 170 18.5 130
1400 760 0.5 17.2 120 13.7 95 10.8 75 - -
1.0 20.0 140 14.8 100 11.7 81 - -
Rupture 32.0 220 24.5 170 18.2 125 13.2 91
1500 816 0.5 13.1 90 10.3 71 7.8 54 - -
1.0 14.1 97 11.2 77 8.6 59 - -
Rupture 23.3 160 17.5 120 12.5 86 8.4 58
1600 871 0.5 10.0 69 7.6 52 5.5 38 - -
1.0 11.0 76 8.4 58 5.8 40 - -
Rupture 17.0 115 12.1 83 8.2 57 5.6 39
1700 927 0.5 7.5 52 5.4 37 3.4 23 - -
1.0 8.3 57 5.7 39 3.6 25 - -
Rupture 12.0 83 8.0 55 4.9 34 3.2 22
1800 982 0.5 5.4 37 3.4 23 1.7 12 - -
1.0 5.7 39 3.6 25 1.9 13 - -
Rupture 8.0 55 4.9 34 2.6 18 1.1 7.6
1900 1038 0.5 - - - - - - - -
1.0 - - - - - - - -
Rupture 7.5 52 3.5 24 1.6 11 - -

*Significant Extrapolation of Data

Plate and Bar - 2250°F (1232°C) Solution Anneal

Test Temperature Creep Approximate Initial Stress to Produce Specified Creep in:
°F °C % 10 h 100 h 1000 h 10,000 h*
ksi MPa ksi MPa ksi MPa ksi MPa
1200 649 0.5 59.0 405 34.0 235 23.0 160 - -
1.0 60.0 415 39.0 270 26.4 180 17.5 120
Rupture - - 56.0 385 42.5 295 29.0 200
1300 704 0.5 30.0 205 20.5 140 15.0 105 - -
1.0 35.0 240 23.5 160 18.0 125 12.3 85
Rupture 52.0 360 39.0 270 29.0 200 21.0 145
1400 760 0.5 19.0 130 14.0 97 11.0 76 - -
1.0 21.5 150 15.9 110 11.5 79 8.0 55
Rupture 37.0 255 27.0 185 20.0 140 14.2 98
1500 816 0.5 13.4 92 10.6 73 8.2 57 - -
1.0 15.0 105 12.0 83 9.2 63 6.5 45
Rupture 26.0 180 19.0 130 14.0 97 9.8 68
1600 871 0.5 10.3 71 8.0 55 5.6 39 - -
1.0 11.7 81 9.0 62 6.0 41 4.4 30
Rupture 18.8 130 13.7 75 9.5 66 6.2 43
1700 927 0.5 7.8 54 5.5 38 3.4 23 - -
1.0 8.8 61 6.3 43 4.0 28 2.6 18
Rupture 13.4 92 9.4 65 6.0 41 3.5 24
1800 982 0.5 5.5 38 3.4 23 1.6 11 - -
1.0 6.3 43 3.8 26 2.0 14 1.1 7.6
Rupture 9.4 65 6.0 41 3.0 21 1.6 11
1900 1038* 0.5 - - - - - - - -
1.0 4.4 30 2.0 14 0.9 6.2 - -
Rupture 7.0 48 3.5 24 1.8 12 - -
2000 1093* 0.5 - - - - - - - -
1.0 2.3 16 0.8 5.5 - - - -
Rupture 4.2 29 2.1 14 1.0 6.9 - -
2100 1149* 0.5 - - - - - - - -
1.0 1.1 7.6 0.4 2.8 - - - -
Rupture 2.3 16 1.2 8.3 0.6 4.1 - -

*Based upon limited data

Vacuum Investment Casting (As Cast)

Test Temperature Approximate Initial Stress to Produce Specified Creep in:
°F °C 10 h 100 h 1000 h 10,000 h*
ksi MPa ksi MPa ksi MPa ksi MPa
1400 760 32.0 220 23.8 165 18.3 125 13.9 96
1500 816 23.0 160 17.4 120 13.0 90 9.8 68
1600 871 17.0 115 12.5 86 9.3 64 6.7 46
1700 927 12.5 86 9.0 62 6.4 44 4.5 31
1800 982 9.0 62 6.4 44 4.4 30 2.9 20
1900 1038 6.5 45 4.5 31 2.9 20 1.7 12
2000 1093 4.7 32 3.0 21 1.8 12 - -
2100 1149 3.2 22 1.9 13 0.9 6.2 - -

*Significant Extrapolation of Data

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