Use and heat treatment of Molybdenum Steel for valve springs.
| Identifier | WestWitteringFiles\R\October1927-December1927\ Scan082 | |
| Date | 10th November 1927 | |
| ORIGINAL Cy. FROM R. {Sir Henry Royce} C. to - R.I. " RG. {Mr Rowledge} " HS. {Lord Ernest Hives - Chair} R1/M10.11.27. MOLYBDENUM STEEL. X2993 (X458) RG. {Mr Rowledge} has brought me Armstrong-Whitworth's pamphlet on the above. Would it make better valve springs or con. rods? Regarding valve springs, I again repeat my impressions that - (1) Supposing a normalising temperature is needed, and this is confirmed by HL. and experience, (this is outside my experience.) (2) That the hardening temperature must only be just high enough to get complete hardening. This gives the finest grained fracture, and if this is carried ever so little too high it cannot be cured by tempering, and will always be weak and liable to break, but can by re-hardening at a lower temperature. (3) The tempering should be tried at increasing heat until the springs lose their set, then a temperature some-what lower should be selected - i.e. are we not leaving our springs too hard, much harder than Brunton's tempered wire? R. {Sir Henry Royce} | ||
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).