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).
Specification chart for Silico Manganese steel from Jonas Woodhead & Sons Ltd.
| Identifier | ExFiles\Box 54\3\ Scan193 | |
| Date | 2nd March 1927 | |
| To accompany ROY{Sir Henry Royce}4/MG.2.3.27 Chart "A" Jonas Woodhead & Sons Ltd. Steel. Silico Manganese Carbon ------------ 0.50 to 0.55% Carbon varied " ------------ 0.55 to 0.60% according to Thickness Silicon ----------- 1.80 to 2.00% Manganese --------- 0.80 to 1.00% Sulphur ----------- 0.04% maximum Phosphorus -------- 0.04 maximum (RR) Physical tests taken at our Brinell requirement of 375 - 3.15mm. dia. give the following average results:- Tenacity per square inch ...... 90 tons Elongation in a length of 2 inches 12% Contraction of area ............ 33% Yield Point - per sq. inch ..... 80 tons. YP: MS (Tenacity) .............. 89% (2.3.27) ENCLOSURE N. 632 "JUSTSO" | ||