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HAYNES® Alloys

Thermal Stability

HAYNES® 230® alloy exhibits excellent retained ductility after long-term thermal exposure at intermediate temperatures. It does not exhibit sigma phase, mu phase, or other deleterious phase formation even after 16,000 hours of exposure at temperatures from 1200 to 1600°F (649 to 871°C). Principal phases precipitated from solid solution are all carbides.

This contrasts markedly with many other solid-solution-strengthened superalloys such as HAYNES 188 alloy, HAYNES 625 alloy, and HASTELLOY® X alloy. These alloys all precipitate deleterious phases, which impair both tensile ductility and impact strength.

230 - Thermal Stability

Room-Temperature Properties after Thermal Exposure (Plate)

Exposure
Temperature
- 0.2% Offset
Yield Strength
Ultimate
Tensile Strength
Elongation Impact Strength
°F °C h ksi MPa ksi MPa % ft.- lbs J
1200 649 0 59 405 123 850 51 54 73
1000 64 440 130 895 43 34 46
4000 59 405 130 895 41 29 39
8000 61 420 130 895 38 30 41
16000 65 450 133 915 37 28 38
1400 760 0 59 405 123 850 51 54 73
1000 59 405 128 885 33 18 24
4000 55 380 129 890 38 22 30
8000 57 395 131 905 35 21 28
16000 61 420 132 910 33 19 26
1600 871 0 59 405 123 850 51 54 73
1000 54 370 126 870 37 18 24
4000 51 350 127 875 43 26 35
8000 51 350 127 875 36 21 28
16000 57 395 129 890 34 19 26

Comparative Room-Temperature Impact Strength

Alloy Solution-Annealed
Charpy V-Notch Impact
Charpy V-Notch Impact
1200°F (649°C) 1400°F (760°C) 1800°F (871°C)
- ft.-lb. J ft.-lb. J ft.-lb. J ft.-lb. J
230® 54 73 30 41 21 28 21 28
625 81 110 5 7 5 7 15 20
X 54 73 15 20 8 11 15 20
188 143 194 23 31 3 4 9 12
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