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).
Metallurgical analysis report detailing hardness, fracture appearance, and chemical composition of various steel shafts.
| Identifier | ExFiles\Box 63\4\ scan0130 | |
| Date | 25th September 1930 guessed | |
| -2- TABLE II. Matl. mark & Crank No. | Brinell near fracture. | Rockwell hardness of case. | Depth of case. | Appearance of fracture. Core. | Case. S/NCR/3 | 317 | - | - | Partly crystalline. | - S/NCR/4 | 313 | - | - | Partly crystalline. | - S/AL/1 | 269 | † - | { 0.022" inside } | Partly crystalline. | Crystalline. S/AL/3 | 269 | † - | { 0.022" outside } | Good. | Crystalline. VNCA | - | - | - | V.{VIENNA} Good. | - S/ZN/1 | - | C61/2 | { 0.042" (on journal) | V.{VIENNA} Good. | V.{VIENNA} Good. S/ZN/2 | - | C61/2 | { 0.033" (on pin) | V.{VIENNA} Good. | V.{VIENNA} Good. | | | { 0.030" (on pin) S/ZNCR/1 * | - | No case. | No case. | Crystalline. | - S/ZNCR/3 * | - | No case. | No case. | Crystalline. | - * This shaft incorrectly marked. The analysis, which is given below, does not correspond with Spec. 236 - Carbon - 0.35% Manganese - 0.51% Chromium - 1.09% Nickel - 3.67% † Rockwell tests on nitrided cases are impracticable. The shafts were found to have an extremely hard case when tested with a file. The inner or core side of the case can be filed away until approx. 0.010" remains. MICRO-EXAMINATION. Nickel Chrome Steel Shafts. Spec. 2082 (S/NCR). The macro structure was sufficiently coarse to be visible in relief when polishing. The slag content was normal. See "General Notes." Contd. | ||