BS 3S 144:1995+A2:2015

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: forging stock and billets and bars for subsequent working: softened designation S144A; forgings: solution treated and primary hardened designation S144C; forgings: solution treated, primary hardened and precipitated, designation S144G; black bars for machining: solution treated and primary hardened, designation S144B; black bars for machining: solution treated, primary hardened and precipitated, designation S144F; bright bars for machining: solution treated, primary hardened and subsequently machined or ground, designation S144D; bright bars for machining: solution treated, primary hardened and precipitated, designation S144H; drawn bars for machining: solution treated, primary hardened and subsequently cold drawn or cold treated and re-primary hardened, designation S144E.