Low temperature case hardening processes
First Claim
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1. A method for case hardening a chromium bearing alloy article, the method comprising:
- activating a surface of the article by applying a layer of iron over the surface of the article; and
carburizing the activated surface at a temperature below a temperature which would produce carbides.
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Abstract
A method for case hardening a chromium bearing nickel or ferrous based alloy, for example stainless steel, article, the method including the steps of activating the surface of the article; and carburizing the activated surface at a temperature below that temperature which would promote the formation of carbides. In one embodiment the surface is activated by disposing a layer of iron over the surface of the article.
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Citations
19 Claims
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1. A method for case hardening a chromium bearing alloy article, the method comprising:
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activating a surface of the article by applying a layer of iron over the surface of the article; and carburizing the activated surface at a temperature below a temperature which would produce carbides. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for case hardening a surface of an article made from a chromium alloy comprising:
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electroplating a layer of iron on the surface, and carburizing the electroplated surface under conditions of time and temperature such that substantially no carbides are formed. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for case hardening a surface of an article made from a chromium alloy comprising:
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providing a layer of iron on the surface, and carburizing the provided surface under conditions of time and temperature such that substantially no carbides are formed. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification