This British Standard specifies requirements for inspection and testing, chemical composition, condition, heat treat-ment and mechanical properties of precipitation hardening chromium-nickel-copper-molybdenum steei castings having a strength of 1250 MPa. (Cr 14.0, Ni 4.5, Cu 2.5, Mo 1.5). Requirements are also given for the rectification of defects and the detection of flaws.Manufacture of castings to this specification may be restricted to foundries specially approved in accordance with 1.1 of British Standard HC 100.NOTE. The titles of the publication referred to in this standard are given on the inside back cover.