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Thermal Stability

HAYNES® 625 alloy is similar to the solid-solution-strengthened superalloys, such as HAYNES® 188 alloy or HASTELLOY® X alloy, which will precipitate deleterious phases upon long- term exposure at intermediate temperatures.  In this case, the phase in question is NiCb delta- phase which serves to impair both tensile ductility and impact strength.  For applications where thermal stability is important, 230® alloy is recommended.

625ThermalS

Room Temperature Properties After Thermal Exposure, Plate

Exposure h 0.2% Offset
Yield Strength 		Ultimate Tensile
Strength 		Elongation Impact
°F °C h ksi MPa ksi MPa % ft.-lb. J
As-annealed* - 66.2 456 127.7 880 46 81 110
1200 649 1000 122.3 843 165.0 1138 28 11 15
4000 117.9 813 163.6 1128 24 8 11
8000 117.8 812 164.2 1132 18 5 7
16000 118.5 817 165.4 1140 12 4 5
1400 760 1000 95.5 658 142.9 985 17 5 7
4000 104.1 718 145.5 1003 12 4 5
8000 97.4 672 142.6 983 13 5 7
16000 96.1 663 140.4 968 12 4 5
1600 871 1000 68.3 471 130.0 896 30 12 16
4000 66.4 458 130.0 896 29 11 15
8000 63.7 439 127.0 876 26 15 20
16000 63.4 437 128.4 885 32 14 19

*1875°F (1024°C), rapid cooled

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