STEEL FOR NITROCARBURIZING AND NITROCARBURIZED COMPONENT, AND METHODS OF PRODUCING SAME
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United States of America
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Dec 1, 2020
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Dec 1, 2020
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Abstract
A component comprising a core part and a surface layer is provided. The core part contains C: 0.01%≤ and <0.20%, Si: ≤1.0%, Mn: 1.5%≤ and ≤3.0%, P: 0.02% or less, S: ≤0.06%, Cr: 0.30%≤ and ≤3.0%, Mo: 0.005% ≤ and ≤0.40%, V: 0.02% ≤ and ≤0.5%, Nb: 0.003% ≤ and ≤0.20%, Al: 0.010%≤ and ≤2.0%, Ti: 0.005%< and <0.025%, N: <0.0200%, Sb: 0.0005% ≤ and ≤0.02%, and the balance consisting of Fe and incidental impurities; and a steel microstructure that contains bainite phase in an area ratio of more than 50%. The surface layer has high nitrogen and carbon contents relative to the chemical composition of the core part.
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