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Steel Material, Process of Fabricating Steel Material, and Apparatus of Fabricating Steel Material

  • US 20110017368A1
  • Filed: 09/30/2010
  • Published: 01/27/2011
  • Est. Priority Date: 03/31/2008
  • Status: Abandoned Application
First Claim
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1. A process of fabricating a steel material by performing a heat treatment to a steel material having high strength, in order to reduce hardness at one part of the steel material to less than hardness at other parts of the steel material,wherein the heat treatment comprises a heating step for rapidly heating a portion from a surface of the steel material to a certain depth by induction heating or direct energization heating, and a cooling step for rapidly cooling the steel material subjected to the heating step after a predetermined time from the heating step, anda heating temperature in the heating step is Ac1 transforming point or more.

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