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 chemical analysis and physical properties of Silico-Manganese steel for Axle Springs.
| Identifier | ExFiles\Box 42\3\ Scan191 | |
| Date | 1st March 1926 | |
| BT.{Capt. J. S. Burt - Engineer} from ROY.{Sir Henry Royce} c. to Hs.{Lord Ernest Hives - Chair} X3854 ROY{Sir Henry Royce}6/MG1.3.26 Axle Springs Woodheads are now using, and have done so for the last two years of so, Silico Manganese for their Axle Springs in place of their previous standard Silico Chrome, and of this Silico Manganese they have used some 3000 to 4000 tons, and found it extremely reliable in every direction. I asked them for details, which they give as follows:- "The analysis of the Silico-Manganese quality which we use as a "standard" - and which is all made in Sheffield of Acid Open-Hearth "quality - is as follows:- Carbon. --------------- 0.50 to 0.55% Carbon varied according to Thickness " --------------- 0.55 to 0.60% Silicon --------------- 1.80 to 2.00% Manganese ------------- 0.80 to 1.00% Sulphur --------------- 0.04% maximum. Phosphorus ------------ 0.04 maximum. Physical tests we have taken at your Brinell requirement "of 375 - 3.15 mm. 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% ROY.{Sir Henry Royce} | ||