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).
Comparison of the chemical composition and properties of various cylinder irons.
| Identifier | ExFiles\Box 132\4\ scan0074 | |
| Date | 27th May 1937 guessed | |
| 5. addition of chromium which is apparently very sharp in action even in small quantities; it is a carbide forming element & is therefore exactly opposite to nickel & silicon, both of which tend to increase graphite. Phosphorus appears to be approved by most people, it increases fluidity & therefore helps in intricate castings. Below is a comparison of various cylinder irons. | | R.R. present production | midland Cyl. Co. x | Buick figures quoted from R.H's report | AEC (Liners) | |---|---|---|---|---| | Total Carbon | 3.5% | 3.43% | 3.4% | 3.0 - 3.5% | | Combined Carbon | 0.70% | 0.55% | — | 0.45 - 0.85% | | Titanium | 0.05% | 0.06% | — | | | manganese | 0.91% | 0.85% | 0.67% | 0.60 - 1.20% | | silicon | 1.70% | 2.18% | 2.3% | 1.80 - 2.3% | | sulphur | 0.10% | 0.10% | 0.16% | under 0.12% | | phosphorus | 0.29% | 0.11% | 0.17% | 0.50 - 0.8% | | Nickel | 1.00% | 0.08% | 0.25% | 0.10 - 0.65% | | Chromium | Traces | 0.27% | 0.30% | 0.10 - 0.30% | | Brinell | 244 - 271 | 205 - 214 | 170 | as cast 225 - 275 Heat Treated 400 - 500 | The R.R. & midland Cyl. Co irons do not vary much except that they have a higher silicon than we have, which probably accounts for the reduction in combined carbon. The addition of chromium would | ||