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 comparison of cylinder liner steel with 0.6% carbon at varying hardness levels, detailing mechanical properties and friction tests.
| Identifier | ExFiles\Box 154a\1\ scan0242 | |
| Date | 16th December 1931 | |
| 81474. To Rg.{Mr Rowledge} c. to Hs.{Lord Ernest Hives - Chair} HL6/AG.16.12.31. Laboratory. RE. COMPARISON OF CYLINDER LINER STEEL 0.6% CARBON OF VARYING HARDNESS. The average mechanical properties of the three types are given below. Brinell. M.S. Y.P. Elongation. (1) 269 55 37 18% (11) 356 80 63 14% (111) 460 110 94 8% (IV) 460 113 100 8% (taken from previous records) No. 1V is C.V.S. steel, of rather hard spring temper, such as is often used. It may be noted that similar 0.6 Carbon steel to our liner material is commonly used for the production of Springs in the range 380 to 480 brinell. Friction test. Six hour runs at 180 to 200°C against Y alloy with P4 oil were made with the steel at the three hardness figures given, with the following results :- Average amps recorded (indicating relative friction or a tendency to pick up) (1) 1.2 (+ .5) (- .2) Wear considerable - surfaces bad. (11) 1.0 (+ .3) (- .1) " about 1/4 of that of (1) Surfaces only slightly worried. (111) 0.73(+ .1) (- .5) Wear negligible. Surfaces very good. Pressure 150 lbs. per square inch, Speed approximately 500 ft. per min. Further mechanical tests, etc., are being carried out. H1. lte. | ||