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 English Steel Corporation specifying the material composition for 30 gun barrels.
| Identifier | ExFiles\Box 176\3\ img102 | |
| Date | 26th June 1940 | |
| Gun 2a COPY SENT TO Rm.{William Robotham - Chief Engineer} BY.5/GH.26.6.40. 26th June 1940. H.{Arthur M. Hanbury - Head Complaints} H.{Arthur M. Hanbury - Head Complaints} Burton Esq., Messrs. English Steel Corporation Ltd., Vickers Works, SHEFFIELD. Dear Mr. Burton, re GUN BARRELS. Confirming our discussion on Monday last, and subsequent telephone conversations, it is suggested that you put in hand immediately, 30 barrels to the attached prints, and to the following material specification. 1. MATERIAL. The material will be your Vibrac steel of the following approximate composition:- Carbon 0.28 to 0.32% Silicon Max. 0.30% Manganese 0.6 to 0.7% Sulphur ) Max. 0.04% Phosphor ) Nickel 2.6 to 2.7% Chromium 0.6 to 0.7% Molybdenum 0.6 to 0.65% The steel will be produced by open hearth melting. 2. PHYSICAL TESTS. The tests will be required in the transverse direction, and to give the following physical properties:- | ||