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).
Composition and heat treatment of various Firth's austenitic steels.
| Identifier | ExFiles\Box 52\2\ Scan249 | |
| Date | 10th October 1930 | |
| X4429. BY {R.W. Bailey - Chief Engineer} /EM3/J.10.10.30. Austenitic Steel. With reference to your note Rg {Mr Rowledge} /TSN3/DM. {D. Munro} 7.10.30, we wish to point out that the following material has been placed on order with Messrs Thomas Firth & Sons Limited, as conforming to your requirements:- 1/- Firth's H.R.Crown Max.Steel. 2/- Firth's Staybrite D.D.Q. Quality. 3/- Firth's Staybrite Ordinary Quality. With regard to the H.R.Crown Steel, the composition of this material is approximately 18% Nickel (handwritten correction: Chromium) 8% Chromium (handwritten correction: Nickel) and 1% Tungsten with 1.5% Silicon. The forging and heat treatment of this steel are the same as the ordinary H.R.Crown of which we have had experience. The Staybrite D.D.Q quality Steel contains approximately 12% Nickel and 12% Chromium and forges quite readily. The heat treatment of this steel consists of heating the material after forging to 1150°C and cooling rapidly either in air or by quenching. The Staybrite Steel ordinary quality is similar in composition to the H.R.Crown and contains about 18% of Nickel (handwritten correction: Chromium) and 8% Chromium (handwritten correction: Nickel). This also can be forged easily and the heat treatment after forging also consists of raising the material to 1150°C and quickly cooling. We are returning to you the drawing of the disc required for the friction tester. BY {R.W. Bailey - Chief Engineer} /EM [Signature] | ||