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).
Material specifications and treatment details for a Bentley V.C.M. Crankshaft.
| Identifier | ExFiles\Box 114\3\ scan0171 | |
| Date | 3rd December 1936 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%. Molybdenum .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. | ||