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- 2018-05-07GB/T 8162 35CrMo steel pipe
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Heat reatment introduction normalizing: heat the steel to above the AC3 or ACCM 30-50 C, holding for some time, put out from the furnace , and cool in air or by water, spray,wind. The Intent of this Technology is to make the grain in steel refine and carbide distribute uniformly. hardenning / quenching heats up the steel to critical temperature Ac3 (hypo-eutectoid steel) or Ac1 (hyper-eutectoid steel) above some temperature, keeps warm for some period of time. causes it completely or the partial austenite 1,than cool the steel quickly at the speed which is faster than the speed of critical cooling.