公开(公告)号：EP1847631A1

公开(公告)日：2007-10-24

申请号：EP07008008.0

申请日：2007-04-19

申请人： Daido Steel Co.,Ltd.

发明人： Hattori, Atsushi ,  Kano,Takashi c/oDaido Steel Co.,Ltd. Daido Corporate Research&Development Center

IPC分类号： C23C8/22 ,  C22C38/18

CPC分类号： C23C8/22 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C23C8/80

摘要： The carburized component of the present inventions is characterized by
having a base metal containing:
C: 0.10% to 0.40%;
Si: 0.05% to 0.8%;
Mn: 0.35% to 1.2%;
Cr: 2.0% to 6.0%; and
remnant including Fe and inevitable impurities,
having a carburized layer formed on a surface layer portion of said base metal, having a grain boundary oxidized layer depth of 1µm or less on a surface thereof and an average C concentration SC of 1. 5% to 4. 0% at 25µm deep from the surface, and
adjusted so as to satisfy:
1.76SC-1.06
said carburized layer also has a carbide area ratio of 15% to 60% at 25µm deep from the surface, an fine carbide area ratio, having a dimension of 0.5µm to 10µm, constitutes 80% or more of the total, and further 70% by volume or more of said fine carbide is M 3 C type.

摘要翻译： 本发明的渗碳组分的特征在于含有：C：0.10〜0.40％的贱金属; Si：0.05〜0.8％ Mn：0.35〜1.2％ Cr：2.0〜6.0％ 并且包含Fe和不可避免的杂质的残留物，具有形成在所述贱金属的表层部分上的渗碳层，其表面上的晶界氧化层深度为1μm以下，平均C浓度SC为1.5％〜 在表面25μm深处为0.4％，调整为满足：1.76SC-1.06