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US 5,344,502 AGranted
Surface hardened 300 series stainless steel
AssigneeThe Babcock & Wilcox Company
InventorsWilliam C. Mack, James M. Tanzosh, Mark J. Topolski
Life of this patent
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Abstract
The surface hardening diffusion process for an austenitic material such as 300-series stainless steel uses a pack carburization process at a temperature range from about 1500.degree. F. to about 2500.degree. F. for a period of time ranging from about one (1) to about eight (8) hours. Chromium carbides are formed on the surface of the austenitic material for increasing its wear resistance.
Claims6
A pack carburizing method for surface hardening an austenitic workpiece, comprising the steps of:
- positioning the austenitic workpiece in a reaction vessel;
- adding a carburizing pack to the reaction vessel;
- subjecting the reaction vessel, carburizing pack and the austenitic workpiece to a temperature ranging from about 1500.degree. F. to about 2500.degree. F. for a time period ranging from about one (1) hour to about eight (8) hours;
- and
- forming chromium carbides on a surface of the austenitic workpiece to increase its wear resistance.
2 more elements
Dependencies are inferred from the claim text.