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HAYNES® Alloys

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 - ksi MPa ksi MPa % ft.-lb. J
As-Annealed* - 66.2 455 127.7 880 46 81 110
1200 650 1000 122.3 845 165.0 1140 28 11 15
4000 117.9 815 163.6 1130 24 8 11
8000 117.8 810 164.2 1130 18 5 7
16000 118.5 815 165.4 1140 12 4 5
1400 760 1000 95.5 660 142.9 985 17 5 7
4000 104.1 720 145.5 1005 12 4 5
8000 97.4 670 142.6 985 13 5 7
16000 96.1 665 140.4 970 12 4 5
1600 870 1000 68.3 470 130.0 895 30 12 16
4000 66.4 460 130.0 895 29 11 15
8000 63.7 440 127.0 875 26 15 20
16000 63.4 435 128.4 885 32 14 19

*1875°F (1025°C), rapid cooled

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