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).
The chemical composition and proposed heat treatment for valve steel.
| Identifier | ExFiles\Box 76\3\ scan0021 | |
| Date | 4th January 1918 | |
| B.H. 838a (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. Mr Hives. Laboratory. 4-1-18 Re Valve in Brown Bayleys Quick-Step. Valve Steel. C = .38 Ni = traces Mn = .27 Cr{Mr Cra???ster / Mr Chichester} = 6.38 P = .047 Proposed Heat Treatment. Quench from 870° in medium oil. Temper 700° Cool in air. | ||