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HAYNES® Alloys

Thermal Stability

When exposed for prolonged periods at intermediate temperatures, HAYNES 25 alloy exhibits a loss of
room temperature ductility in much the same fashion as some other solid-solution-strengthened superalloys,such as HASTELLOY® X alloy or alloy 625. This behavior occurs as a consequence of the
precipitation of deleterious phases. In the case of a 25 alloy, the phase in question is CO2W laves
phase. HAYNES 188 alloy is significantly better in this regard than 25 alloy; however, for applications
where thermal stability is important, 230® alloy is an even better selection.

Room-Temperature Properties of Sheet After Thermal Exposure*

Exposure
Temperature
- 0.2% Offset
Yield Strength
Ultimate
Tensile Strength
Elongation
°F °C h ksi MPa ksi MPa %
None 0 66.8 460 135.0 930 48.7
1200 650 500 70.3 485 123.6 850 39.2
1000 92.3 635 140.0 965 24.8
2500 95.1 655 130.7 900 12.0
1400 760 100 68.9 475 115.3 795 18.1
1600 870 100 72.1 495 113.6 785 9.1
500 77.3 535 126.1 870 3.5
1000 81.7 565 142.0 980 5.0

*Composite of multiple sheet lot tests

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