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 Nickel Chrome Molybdenum steel for forgings and crankshafts.
Identifier | ExFiles\Box 116\1\ scan0144 | |
Date | 20th March 1934 | |
16 CODE NUMBER M.4035. NICKEL CHROME. MOLYBDENUM. STEEL FOR FORGINGS. CHEMICAL ANALYSIS. CARBON .32-.36% MANGANESE 1.00-1.3% SILICON .1-.2% SULPHUR } .04% MAX PHOSPHOROUS } NICKEL .85-1.15% CHROMIUM .3% MAX. MOLYBDENUM .20-.30% HEAT TREATMENT. NORMALIZE AT 850°-880°C. HEAT TO 810°-830°C QUENCH IN OIL. MAX TEMPERING HEAT 670° TEMPER TO REQUIRED HARDNESS. PHYSICAL PROPERTIES FOR CRANKSHAFTS. YIELD TONS PER SQ. INCH. 35-50 MAXIMUM STRESS 50-60 TONS. ELONGATION 18% REDUCTION 50% IZOD IMPACT. 40/70 FT. LBS. BRINELL. 225-270. NOTE:- PREFIX "M" DENOTES CONDITION OF STEEL AFTER HEAT TREATMENT. 15 | ||