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 from Ford Motor Company detailing the chemical composition analysis of various American gear steels.
| Identifier | ExFiles\Box 136\4\ scan0090 | |
| Date | 3rd May 1934 | |
| COPY. 1183 FORD MOTOR COMPANY LTD., DAGENHAM, ESSEX. Dept. A-5 W.A. Robotham, Esq., Messrs. Rolls-Royce Ltd., Derby. 3 May 1934. Dear Mr. Robotham, In reply to your letter of the 24th ultimo on the subject of American Gear Steels; the steel mentioned S.A.E. 3440, so far as we are concerned, is not listed as a standard S.A.E. steel but will obviously come between the group 3435 and 3450. The steels in the group have the following analyses:- 3435 3450. Carbon .30/.40% .45/.55% Manganese .30/.60% .30/.60% Phosphorus .04% .04% Sulphur .045 .045% Nickel 2.75/3.25% 2.75/3.25% Chromium .60/.95% .60/.95% Both these are nickel chrome steels intended for heat treated, machined and forged parts subject to severe service conditions. The composition for steel 3440 would be as follows:- Carbon .35/.45% Manganese .30/.60% Phosphorus .04% Sulphur .045% Nickel 2.75/3.25% Chromium .60/.95% We do not use this type of steel for Ford gear parts, and are therefore unable to quote names of English suppliers. You should, however, have no difficulty in obtaining this analysis. Our Company use a Chrome steel for most gears to the following analysis:- | ||