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 for 5% Nickel Case Hardening Steel (High Nickel Content).
| Identifier | ExFiles\Box 126\3\ scan0061 | |
| Date | 12th November 1931 | |
| 64lls ROLLS - ROYCE LTD. SPECIFICATION NO.207C. MATERIAL. 5% Nickel Case Hardening Steel (High Nickel Content). ANALYSIS. Carbon 0.10% to 0.15% Manganese 0.30% to 0.40% Silicon Not more than 0.30% Sulphur " " " 0.04% Phosphorus " " " 0.04% Nickel 5.0% to 5.5% Chromium Not more than 0.30% GENERAL CONDITIONS (1) Analysis of all casts must be submitted to and accepted by us before steel is rolled. (2) Casts which fall just outside our limits may be submitted to us and we may apply for a sample, but we do not undertake to accept such casts. (3) All billet for stamping must have the cast number stamped on. In the case of finished rolled bars this is not necessary, but we must be advised of the cast number from which they are made. (4) All finished bars above 5/8" dia. and less than 3" dia. shall be reeled. Bars to be delivered as reeled. PREPARATION OF TEST PIECES. (1) Test Piece should be turned down to 0.750" dia. (2) Carburise at 900°C. for four hours and cool in air. (3) Reduce on test length to 0.575" dia. (4) Heat to 820/830°C. Soak for 15 minutes and quench in thin oil. (5) Heat to 730/750°C. and quench in thin oil. (6) Grind on test length to 0.564" dia. MECHANICAL TESTS. Brinell 302 - 341 Core Tensile Ult.Stress Not less than 68 tons pr.sq.in. Elongation on 2" " " " 13% Red. in Area- " " " 35% Izod Not less than 30 ft. lbs. Case Hardness Rockwell C57 - C62 = 750/820 Vickers Depth of Case after grinding .025 to .035" | ||