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).
Micro-examination and chemical analysis comparing Firth-Derihon and Aubert et Duval steel test bars.
| Identifier | ExFiles\Box 154a\1\ scan0147 | |
| Date | 21th March 1929 guessed | |
| Lab. Ref. Sheet. Micro-examination. Comparison of structures, etc., of Firth-Derihon test bars and the Aubert and Duval bars now being examined. Firth-Derihon. Aubert et Duval. T.B. No. 5. T.B. No. 6. Total depth of case as seen under microscope. 0.022" 0.018" 0.020" See A604 {Depth of white band on surface side of trans. sect. including closely packed white lines immediately beneath. 0.003" 0.0011" 0.0015" See A605 {Presence of thin grey band in white layer. Yes. No. No. Depth at which white lines can be discerned. 0.020" 0.008" 0.008" Analyses. Steel "K3" (T.B. No. 1.) Steel "K5" (T.B. No. 10.) Carbon ................ 0.37 % Carbon ................ 0.34 % Manganese ............. 0.65 % Manganese ............. 0.63 % Nickel ................ 0.18 % Nickel ................ 0.27 % Aluminium ............. 1.18 % Aluminium ............. 1.08 % Molybdenum ............ 0.20 % Molybdenum ............ 0.28 % Chromium .............. 1.56 % Chromium .............. 1.38 % Silicon ............... 0.14 % Silicon ............... 0.13 % Sulphur ............... 0.018 % Sulphur ............... 0.018 % Phosphorus ............ 0.018 % Phosphorus ............ 0.022 % Copper ................ Nil. Copper ................ Nil. Vanadium .............. Nil. Vanadium .............. Nil. | ||