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).
The selection and heat treatment of different steels used for aero-engine and car components.
| Identifier | ExFiles\Box 153\1\ scan0300 | |
| Date | 12th May 1939 | |
| - 2 - of things without any disability whatsoever. Again this material is used for quite a number of aero engine parts, and in no instance have I known of parts being scrapped because of the difficulty in controlling the treatment of the steel. In this respect it does not differ from ordinary 5% case hardening nickle, which represents one of the steels of which we use most, in fact it is only second to the 3 1/2% heat treated nickel steel used for all normal parts of our car. With regard to the point that the steering should not depend on the correct treatment of a piece of steel, this criticism carries no weight, as every ball connection is made in case hardening nickel steel, and if a mistake were made in the sense that the wrong steel was used, the balls in question would fail, in fact they would break off under impact like cast iron. We, of course, take the utmost care to ensure that the parts are right by breaking samples after heat treatment, exactly as we are doing in the case of the follower roller. BY.{R.W. Bailey - Chief Engineer} | ||