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).
Steel specifications for gun barrels, referencing U.S. Arsenal practices and cancelling further inquiries.
| Identifier | ExFiles\Box 170\4\ img039 | |
| Date | 30th August 1940 | |
| ROLLS-ROYCE INC. TELEPHONES TRINITY 2-1135 & 2-1136 ROOM 2-261 GENERAL MOTORS BUILDING DETROIT, MICHIGAN OY 6/D/Aug.30.40 Serial No. 209 13 August 30, 1940 File Rolls-Royce, Ltd. Derby, England Gun Barrels Rm.{William Robotham - Chief Engineer} Attached copy of note from Lessells contains following information: U.S. Arsenal uses for barrels a chrome molybdenum vanadium steel which is not any S.A.E. standard, but is rather like S.A.E. 6130 with added molybdenum. Arsenal will accept open-hearth steel provided the macroetch shows good results. Transverse tensile tests are specified. S.A.E. 4140 used for rifle barrels. 4140 will machine better at a given Brinell than the straight carbon steel suggested in your last paragraph. I believe you will not want us to go further in getting material prices for gun steel in view of Hs.{Lord Ernest Hives - Chair}' cable of August 21 - "....Cancel inquiries on gun parts." OY Copies to: BN{W.O. Bentley / Mr Barrington} LR{Mr Ellor} Ringholz | ||