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The AISI–SAE designation 4340 refers to a:

  1. Plain carbon steel with 0.43% carbon
  2. Stainless steel
  3. Nickel–chromium–molybdenum alloy steel with 0.40% carbon
  4. Tool steel with 4% tungsten

Answer

C. Nickel–chromium–molybdenum alloy steel with 0.40% carbon

Solution

43xx: Ni–Cr–Mo steels.

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