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).
Definition and specification of various types of steel for chassis work.
| Identifier | ExFiles\Box 142\4\ scan0192 | |
| Date | 12th November 1937 | |
| - 2 - (f). Carbon steels. (g). Spring steels (high carbon). (h). Spring steels (chrome Vanadium). In defining or specifying the steels we require we must therefore in each class specify the type of steel by outlining the mean composition of the type required but without limiting it on the high or low side, this being, under the method we propose to employ in future, the steel makers responsibility; but in addition we must carefully specify the physical characteristics which are demanded by the service we propose to impose upon the steel. For each tensile strength used there will be a specification number. In future, therefore, for chassis work we will maintain the present series of alloy steels with their existing mean figures for composition, but to each of these classes we will appoint a new number to distinguish them from the somewhat similar aero steels, the particular physical condition we wish to define them by for each duty will be this number with suffixes of A.{Mr Adams} B. C. and one for each tensile strength in which the steel is required. It will be necessary for Mr. Marriott to draw up a series of specifications, based on the above requirements; were it not for the fact that the aero side use the existing specifications we could retain these for chassis, but as the position will not permit of this I propose to add 100 to the existing specification number which will enable us to link up with the original number on the drawings already existing, which it would be too laborious to go over and change. By.{R.W. Bailey - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} | ||