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).
Notes on heat treatment and case hardening methods for various types of steel.
| Identifier | ExFiles\Box 114\1\ scan0070 | |
| Date | 2nd January 1936 guessed | |
| NOTES ON HEAT TREATMENT The following methods of Case Hardening are used at the Gleason Works on S.A.E. 2315, 2512, 3312X and 4615 steels. A - Single Heat Treatment 1 - Carburize at 1700° F.{Mr Friese} 2 - Cool in Box. 3 - Reheat to 1450° F.{Mr Friese} 4 - Quench in oil. B - Double Heat Treatment 1 - Carburize at 1700° F.{Mr Friese} 2 - Quench from box in oil. 3 - Reheat to 1450° F.{Mr Friese} 4 - Quench in oil. C - Box Quench 1 - Carburize at 1700° F.{Mr Friese} ) Does not apply on 2 - Quench from box in oil.) SAE 3312X Steel Pinions are hardened by either the Double Heat Treatment or the Box Quench, and gears by the Single Heat Treatment or the Box Quench Method. In the majority of automotive manufacturing plants the Box Quench Method is almost universally used for both pinions and gears. If a drawing heat is considered necessary, the draw temperature should not be high enough to cause tooth surfaces to be affected when tested by a Nicholson "XF" file or its equivalent. In addition to a greater core refinement, the Double Heat Method of hardening pinions, gives a slightly greater surface hardness than the Single Heat Method with about equal distortion qualities. The Box Quench Method produces a file hard surface and a core that has high fatigue resisting qualities, with the least distortion of any of the three methods. The pinions should be packed in a vertical position in the carburizing pots and means provided for removing them singly as they are quenched, to prevent the cooling which would occur if pots were dumped. In hardening pinions by the Box Quench Method, care should be taken to see that the hot pinions do not touch each other during the quenching, as this would cause an ununiform rate of cooling. A special tank should be arranged which will insure that the same conditions of quenching will be applied to all pinions. -1- | ||