R

Ram Sharma • 193.88K Points
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Q. Pick out the wrong statement.

  • (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen
  • (B) Nitrogen in presence of steam decar-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures
  • (C) Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness
  • (D) None of these
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