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Heat-treating methods and systems

  • US 6,594,446 B2
  • Filed: 12/04/2000
  • Issued: 07/15/2003
  • Est. Priority Date: 12/04/2000
  • Status: Expired due to Term
First Claim
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1. A method of heat-treating a workpiece, the method comprising:

  • a) increasing a temperature of the workpiece over a first time period to an intermediate temperature, wherein increasing comprises pre-heating said workpiece at a rate of at least 250°

    C. per second; and

    b) heating a surface of the workpiece to a desired temperature greater than said intermediate temperature, said heating commencing within less time following said first time period than said first time period.

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