From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Air Ministry specification for 60-70 ton Chromium-Molybdenum Steel suitable for nitrogen hardening.
| Identifier | ExFiles\Box 146\1\ scan0121 | |
| Date | 17th July 1937 | |
| AIR MINISTRY SPECIFICATION FOR 60-70 TON CHROMIUM-MOLYBDENUM STEEL (Suitable for Nitrogen Hardening) -:-:-:-:-:- w.e. 17/7/37 42 (ME) AIR MINISTRY D.T.D. 306 April 1937 Cr{Mr Cra???ster / Mr Chichester} not less than 2,5, not more than 3,5 Mo not less than 0,3, not more than 0,7 Ni not more than 0,3, C not less than 0,15, not more than 0,35 p.c. [Handwritten text on left margin]: GK5 800 V.B. [Faint mirrored text on right margin]: ECIVIB-2LHOИC WVИ B S CO | ||