I work in the porduction of this alloy extensively and there is now American
Spec for this grade that I know of. It is prodomanatly a European steel
grade and the main national standard specs being the Brititsh BS 3S 132, BS
970 type 879M39 (EN40) and E-40CDV12 from the French AIR 9160C military spec
or the yet fully published prEN 3971/3972. There are also many manufacture
specific specs for Rolls-Royce, Snecma Group, Aerospaciale, etc.
Basic Properties are:
Based on heat treatment:
Harden 950 DegC 1-2hrs Oil Quench
Temper 600/650DegC for >1hr Air Cool
0.2% PS UTS %Elong %RoA Impact
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