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Creep and Stress-Rupture Strengths

HAYNES® 718 Sheet, Age-Hardened*

Temperature Creep Approximate Initial Stress to Produce Specified Creep in
10h 100h 1,000h
°F °C % ksi MPa ksi MPa ksi MPa
1000 538 0.5 157 1083 146 1007 132 910
1 160 1103 150 1034 138 952
R -- -- 165 1138 144 993
1100 593 0.5 140 965 126 869 108 745
1 143 986 130 896 112 772
R 150 1034 134 924 115 793
1200 649 0.5 121 834 101 696 75 517
1 124 855 103 710 78 538
R 130 896 105 724 87 600
1300 704 0.5 95 655 64 441 35 241
1 98 676 67 462 41 283
R 106 731 76 524 46 317
1400 760 0.5 54 372 24 165 3.8 26
1 60 414 28 193 5.1 35
R 70 483 37 255 17 117

*Samples were age hardened by treating at 1325°F (718°C)/8h/FC to 1150°F (621°C)/8h/AC

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

At temperatures below 1200°F (649°C), HAYNES® 718 alloy has creep strength that is superior to most other age-hardenable, wrought nickel-base superalloys.  However, starting at temperatures around 1200°F (649°C) and higher, gamma-prime strengthened alloys such as HAYNES® 282® alloy, HAYNES® Waspaloy alloy, and HAYNES® 263 alloy provide higher strength.

718 Alloy Comparison of Stress to Produce 1% Creep in 1000 Hours in Sheet

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