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).
The heat treatment procedures for Peregrine cylinder liners.
| Identifier | ExFiles\Box 55\1\ Scan031 | |
| Date | 13th April 1933 | |
| Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X4684 O.RHO. BY/EM4/J.13.4.33. Peregrine Cylinder Liners. Further to our memo BY/EM2/J.10.4.33., and your notes written on same, the information you require is as follows:- (1) Any cylinder liners of Messrs. Sheepbridge Stokes manufacture which are not finished can be heat treated as follows:- (a) Heat to 860/880°C. and quench in oil. (b) If tempering is necessary, liners may be tempered at 250-300°C. for half-an-hour and cooled in air. The brinell hardness after this treatment should be 415 to 444. (2) Any cylinder liners of our own manufacture can be heat treated by heating to 880 to 900°C. and quenching in oil also followed by tempering at 300°C. for half-an-hour. This will also give a similar result namely, a brinell range of 415 to 444. It will be appreciated of course, that only grinding is possible after this heat treatment which should therefore be carried out after final machining but special grinding allowances will probably be necessary to correct any distortion which will arise during the heat treatment. In accordance with your request we are also ordering twelve cylinder lines from The British Piston Ring Co. in the same quality of iron as used by the A.E.C. and will notify you as soon as they arrive. BY EM. | ||