BS 5S 99:1994+A1:2015

This 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) is classified in these ICS categories:

• 49.025.10 Steels

This standard specifies characteristics of a nickel-chromium-molybdenum steel supplied in the following forms, and as parts, for general aerospace use:

1. forging stock, designation S99A;

2. forgings: softened, designation S99C;

3. forgings: hardened and tempered, designation S99F;

4. black bars for machining: softened, designation S99B;

5. black bars for machining: hardened and tempered, designation S99E;

6. bright bars for machining: softened, designation S99D;

7. bright bars for machining: hardened and tempered, designation S99G.