BS 5S 99:1994+A1:2015 | 15 Jan 1994 | BSI Knowledge
Standard
BS 5S 99:1994+A1:2015
Specification for 2.5% nickel-chromium-molybdenum (high carbon) steel billets, bars, forgings and parts (1230-1420 MPa: limiting ruling section 150 mm)
Current
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Published:
1 Scope
This standard specifies characteristics of a nickel-chromium-molybdenum steel supplied in the following forms, and as parts, for general aerospace use:
a) forging stock, designation S99A;
b) forgings: softened, designation S99C;
c) forgings: hardened and tempered, designation S99F;
d) black bars for machining: softened, designation S99B;
e) black bars for machining: hardened and tempered, designation S99E;
f) bright bars for machining: softened, designation S99D;
g) bright bars for machining: hardened and tempered, designation S99G.