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 sheet detailing the material composition and treatment for a Bentley V.C.M. crankshaft.
| Identifier | ExFiles\Box 114\3\ scan0163 | |
| Date | 19th November 1937 guessed | |
| PARTICULARS OF BENTLEY V.C.M. CRANKSHAFT. Carbon .25 to 35%. Silicon (not more than) .35%. Manganese " " " 1.0% Sulphur. " " " .05%. Phosphorus " " " .05%. Nickel. " " " 1.00%. Chromium. .5% to 1.5%. Malybdenum .9% to 1.5%. Nitriding 475°C plus or minus 5° for 60 hrs. Depth of case .010 Hardness of case not less than 600 Vickers diamond hardness. Hardness of core Brinell 248-293. | ||