Surface layer hardened metal material and surface layer hardening method
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United States of America Patent
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Oct 3, 2017
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Dec 25, 2013
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Dec 26, 2012
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Providing improved wear resistance to a metal material by hardening a surface layer and a surface layer hardening method. A base material is nitrided so that a metal material (40) has a surface layer hardened. The surface layer of the base material is formed with no nitrogen compound layer (40C), and the base material includes a region from a surface thereof to a depth of 78 μm, the region having a Vickers hardness higher than the base material by not less than 5%.
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