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).
Comparing the chemical compositions and heat conductivity of four different valve steels.
| Identifier | ExFiles\Box 154a\1\ scan0072 | |
| Date | 8th June 1928 | |
| X1474. R. {Sir Henry Royce} By. {R.W. Bailey - Chief Engineer} H12/EA8.6.28. Laboratory. Valve Steel. Further to our memo. H11/EA4.6.28. We give below the compositions of the four valve steels reported on in the above memo. :- Steel. Firth's H.R. Crown. K.E. Austenitic. Silchrome. Quickstep. Carbon 0.38% 0.38% 0.46% 0.40% Manganese 0.77% 0.75% 0.52% 0.47% Nickel 9.14% 12.95% Chromium 13.4 % 12.90% 8.35% 7.30% Tungsten 3.72% 2.40% Silicon 0.52% 1.48% 3.48% 0.89% The relative heat conductivity figures (taking copper as unity, mild steel is then about 0.12) are :- 0.038 0.035 0.070 0.079 Cu.918 With a lower silicon content, the Silchrome steel would probably give a higher conductivity figure. H1. | ||