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).
Specification for die castings in aluminium alloy, detailing chemical composition and mechanical tests.
| Identifier | ExFiles\Box 76\3\ scan0052 | |
| Date | 26th April 1917 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. ROLLS-ROYCE SPECIFICATION FOR DIE CASTINGS (ALUMINIUM ALLOY) CHEMICAL COMPOSITION Copper 1% to 6% Zinc 1% to 8% Tin. Max 1.5% Silicon " 0.5% Iron " 0.6% Manganese " 0.1% Magnesium " 0.1% The composition should be such that (half Zinc) + Copper + 3 Iron should not exceed the value 8.0 Brinell as cast in 1" round mould at 350°C (about) should be 60 to 80 and it should give the mechanical tests below M.S. Y.P. Elongation R.A. Tensile 10.0 7.5 3.0 3.2 Stanton At least 1000 blows (.312" drop) H C Hall | ||