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13-8Mo is a vacuum-melted, precipitation hardening stainless known for its superior strength and toughness. Double vacuum melting lends this alloy to critical aircraft, nuclear and rocket engine parts. The controlled chemistry of the AMS 5934 version yields higher fracture toughness and charpy impact values.

Chemical Composition

Element min max
Carbon 0.05
Manganese 0.1
Silicon 0.1
Phosphorus 0.01
Sulfur 0.008
Chromium 12.25 13.25
Nickel 7.5 8.5
Molybdenum 2 2.5
Aluminum 0.9 1.35
Nitrogen 0.01

Precipitation Hardening Conditions

H950 950 °F ± 10 (510 °C ± 6)
H1000 1000 °F ± 10 (538 °C ± 6)
H1025 1025 °F ± 10 (552 °C ± 6)
H1050 1050 °F ± 10 (566 °C ± 6)
H1100 1100 °F ± 10 (593 °C ± 6)
H1150 1150 °F ± 10 (621 °C ± 6)