Modified low temperature case hardening processes

  • US 6,547,888 B1
  • Filed: 01/28/2000
  • Issued: 04/15/2003
  • Est. Priority Date: 01/28/2000
  • Status: Expired due to Term
First Claim
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1. A process for case hardening a workpiece by gas carburization in which the workpiece is contacted with a carburizing gas at an elevated carburization temperature to cause carbon to diffuse into the workpiece surfaces thereby forming a hardened case of predetermined thickness without formation of carbide precipitates, wherein the instantaneous rate of carburization is reduced during carburization so as to foster rapid carburization during an earlier stage of carburization while avoiding formation of carbide precipitates at a later stage of carburization.

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