BS 3S 144:1995 Specification for chromium-nickel-copper-molybdenum corrosion resisting steel (precipitation hardening) billets, bars, forgings and parts (1130-1330 MPa)
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This British Standard specifies characteristics of a chromium-nickel-copper-molybdenum corrosion resisting steel supplied in the following forms and as parts, for general aerospace use:
a) forging stock and billets and bars for subsequent working: softened designation S144A;
b) forgings: solution treated and primary hardened designation S144C;
c) forgings: solution treated, primary hardened and precipitated, designation S144G;
d) black bars for machining: solution treated and primary hardened, designation S144B;
e) black bars for machining: solution treated, primary hardened and precipitated, designation S144F;
f) bright bars for machining: solution treated, primary hardened and subsequently machined or ground, designation S144D;
g) bright bars for machining: solution treated, primary hardened and precipitated, designation S144H;
h) drawn bars for machining: solution treated, primary hardened and subsequently cold drawn or cold treated and re-primary hardened, designation S144E.
