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).
Letter to Ransome & Marles Bearing Co. Ltd. discussing carburising temperatures for parts.
| Identifier | ExFiles\Box 153\2\ scan0173 | |
| Date | 9th November 1936 | |
| - 2 - 9th. November 1936. Messrs. Ransome & Marles Bearing Co. Ltd., Newark on Trent. (b). If you will, therefore kindly let us have some of these parts as you suggest we will have them tested and report. One other point raised by our Mr. Hardy, to carburise at 875 instead of 880°C., we are quite satisfied with. You will, of course, have to give the pieces a some- what longer length of time in the muffle, but we appreciate that the lower temperature gives you even a greater safeguard against the formation of cementite on the surface than 880°C which we suggested. In our experience, dealing in this case with bearing surfaces as well as gear teeth, we have used 880°C without the production of cementite, but we are quite prepared to accept your figure of 875°C. Yours faithfully, FOR ROLLS-ROYCE LIMITED. TECHNICAL PRODUCTION ENGINEER. | ||