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).
Comparison of physical properties and Upton Lewis test results for various types of steel.
| Identifier | ExFiles\Box 154a\1\ scan0113 | |
| Date | 16th November 1928 | |
| BY5/G.16.11.28. COMPARISONS OF PHYSICAL TESTS OF NICKEL CHROME STEEL 3½% NICKEL STEEL AND FIRTHS NITROGEN HARDENING STEEL. TYPE OF STEEL | Brinell | Ultimate Tensile | Yield | Elong % | R.A.% | Stanton Nickel Chrome Steel Spec. 2081. | 285, 293 | 62.7, 63.2 | 53.8, 54.0 | 20.3, 20.0 | 57.7, 57.3 | 5530, 5700 3½% Nickel Steel Spec. 2062. | 285, 302 | 62.5, 64.0 | 57.6, 58.0 | 19.7, 19.5 | 53.2, 52.0 | 5250, 5800 Firths Nitrogen Hardening Steel. Not hardened. | 285 | 60.8 | 51.8 | 22.5 | 58.9 | Firths Nitrogen Hardening Steel. Hardened but with case removed. | 285, 293 | 62.5, 63.1 | 54.0, 53.2 | 19.0, 20.0 | 60.0, 60.0 | Firths Nitrogen Hardening Steel. Hardened (with case intact). | | 61.8, 61.2, 63.5 | 52.0, 48.6, 52.0 | 7.5, 8.0, 10.0 | 19.8, 15.0, 19.5 | 6181, 6471, 6183, 6274 NOTE. The test figures shewn above for Nickel Chrome Steel are the average of a large number of 20 HP. and 40/50 HP. crankshafts. Similarly the 3½% Nickel Steel test results are the average obtained from Connecting Rods. UPTON LEWIS TESTS. FIRTHS NITROGEN HARDENING STEEL. CYCLES | HEIGHT IN CMS. 140 | 3.0 165 | 2.8 145 | 2.95 123 | 2.90 AVERAGE 144 | 2.9 CHROME VANADIUM STEEL. CYCLES | HEIGHT IN CMS. 242 | 4.05 220 | 4.15 AVERAGE 231 | 4.1 SILICO MANGANESE STEEL. CYCLES | HEIGHT IN CMS. 260 | 3.7 245 | 3.75 200 | 3.7 AVERAGE 235 | 3.71 | ||