1 Scope
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:
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a) forging stock and billets and bars for subsequent working: softened designation S144A;
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b) forgings: solution treated and primary hardened designation S144C;
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c) forgings: solution treated, primary hardened and precipitated, designation S144G;
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d) black bars for machining: solution treated and primary hardened, designation S144B;
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e) black bars for machining: solution treated, primary hardened and precipitated, designation S144F;
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f) bright bars for machining: solution treated, primary hardened and subsequently machined or ground, designation S144D;
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g) bright bars for machining: solution treated, primary hardened and precipitated, designation S144H;
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h) drawn bars for machining: solution treated, primary hardened and subsequently cold drawn or cold treated and re-primary hardened, designation S144E.