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    • 92. 发明申请
    • Nitrocarburized microalloyed steel member
    • 氮碳共渗微合金钢构件
    • US20070144619A1
    • 2007-06-28
    • US11437872
    • 2006-05-22
    • Tetsuya AsaiYoshihiro TakitaniMasaki AmanoMakoto HoboKazuyoshi KimuraKatsunori Takada
    • Tetsuya AsaiYoshihiro TakitaniMasaki AmanoMakoto HoboKazuyoshi KimuraKatsunori Takada
    • C23C8/32
    • C22C38/60C22C38/001C22C38/002C22C38/02C22C38/04C22C38/42C22C38/50C23C8/32F16C3/08F16C2204/64
    • A nitrocarburized microalloyed steel member consists of a microalloyed steel that includes a nitrocarburized layer on a surface, a cross-sectional structure of which steel except for the nitrocarburized layer includes a ferrite and pearlite structure. The microalloyed steel mainly consists of Fe and has a composition: C having a content of 0.30 mass % or more and 0.50 mass % or less; Si having a content of 0.05 mass % or more and 0.30 mass % or less; Mn having a content of 0.50 mass % or more and 1.00 mass % or less; S having a content of 0.03 mass % or more and 0.20 mass % or less; Cu having a content of 0.05 mass % or more and 0.60 mass % or less; Ni having a content of 0.02 mass % or more and 1.00 mass % or less; and Cr having a content of 0.05 mass % or more and 0.30 mass % or less. If the contents of the Cu, the Ni, and the Cr are represented by WCu, WNi, and WCr mass %, respectively, and composition parameters F1 and F2 are 185WCr+50WCu and 8+4WNi+1.5WCu−44WCr, respectively, then the composition parameters F1 and F2 satisfy F1>20 and F2>0.
    • 氮碳共渗微合金钢构件由包括表面上的氮碳共渗层的微合金化钢构成,除了氮碳共渗层之外的钢的截面结构包括铁素体和珠光体组织。 微合金化钢主要由Fe组成,组成为:含有0.30质量%以上至0.50质量%以下的C; Si含量为0.05质量%以上且0.30质量%以下的Si; Mn为0.50质量%以上且1.00质量%以下的Mn; S的含量为0.03质量%以上且0.20质量%以下; Cu含量为0.05质量%以上且0.60质量%以下的Cu; 含量为0.02质量%以上且1.00质量%以下的Ni; Cr为0.05质量%以上且0.30质量%以下的Cr。 如果Cu,Ni和Cr的含量分别由WCu,WNi和WCr质量%表示,组成参数F 1和F 2分别为185WCr + 50WCu和8 + 4WNi + 1.5WCu-44WCr ,则组成参数F 1和F 2满足F 1> 20且F 2> 0。