Steel name: 4340
  Diagram No.: 6
  Type of diagram: TTT
  Mat. No. (Wr. Nr.) designation: 1.6565
  AISI designation: 4340
  SAE designation: J1397
  DIN designation: 40NiCrMo6
  Chemical composition in weight %: 0.37 - 0.43% C, Cr 0.7 - 0.9% Cr, 0.7% Mn,
  0.23% Si, 0.2 - 0.3% Mo, 1.83% Ni, Max. 0.035% P, Max. 0.04% S.
  Note: AISI 4340 is a heat treatable, Low alloyed steel containing nickel, chromium
  and molybdenum.
  Source: ASM, Heat Treating Cleaning and Finishing, 8th Edition, Vol.2, 1964, p.38.

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