Rolls-Royce Archives
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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
  
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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.
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