The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is___________________?
Correct answer: D. Patenting
- A. Full annealing
- B. Bright annealing
- C. None of these
- D. Patenting
Explanation
Patenting is the controlled heat treatment used for high-carbon steel wire, commonly above about 0.25% carbon, to obtain a fine pearlitic structure suitable for drawing. Annealing mainly softens the steel rather than preparing it for this wire-drawing condition.
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