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Steel material excellent in bending fatigue characteristic after carburizing, process for producing the same, and carburized part
Steel material excellent in bending fatigue characteristic after carburizing, process for producing the same, and carburized part
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机译：渗碳后的弯曲疲劳特性优异的钢材及其制造方法和渗碳零件
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摘要
PROBLEM TO BE SOLVED: To provide a steel material capable of obtaining a carburization component having excellent flexural fatigue properties after a carburization treatment, without generating coarse Al-based nitride even in a component system with comparatively high Al content, and also to provide an effective method for producing such a steel material and a carburization component that presents the above properties.SOLUTION: A steel material includes, C of 0.15-0.25%, Si of 0.05-0.30%, Mn of 0.5-1.0%, Cr of 1.0-1.5%, Al of 0.15-0.25%, N of 0.0030-0.025%, and a balance including iron and inevitable impurities. The inevitable impurities are limited to include P of 0.015% or less (not including 0%), S of 0.02% or less (not including 0%) and O of 0.0025% or less. The maximum equivalent circle diameter of Al-based nitride present in the steel is 0.5 μm or less.
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