公开(公告)号：US20060137766A1

公开(公告)日：2006-06-29

申请号：US11319871

申请日：2005-12-27

申请人： Shuji Kozawa ,  Tatsuro Ochi ,  Hideo Kanisawa ,  Tomoko Serikawa ,  Koki Mizuno

发明人： Shuji Kozawa ,  Tatsuro Ochi ,  Hideo Kanisawa ,  Tomoko Serikawa ,  Koki Mizuno

IPC分类号： C22C38/22 ,  C22C38/24 ,  C23C8/22 ,  C23C8/32

CPC分类号： C23C8/22 ,  C23C8/32

摘要： The present invention provides case-hardening steel superior in tooth surface fatigue strength and a gear using the same used for parts of automobiles, construction machines, industrial machines, etc., that is case-hardening steel superior in tooth surface fatigue strength containing, by wt %, C: 0.1 to 0.3%, Si: 1.0 to 2.0%, Mn: 0.3 to 2.0%, S: 0.005 to 0.05%, Cr: 1.0 to 2.6%, Mo: 0.8 to 4.0%, V: 0.1 to 0.3%, Al: 0.001 to 0.2%, and N: 0.003 to 0.03%, limiting P to 0.03% or less, and having as a balance iron and unavoidable impurities, and satisfies the following expression, 31Si (%)+15Mn (%)+23Cr (%)+26Mo (%)+100V (%) is 100 or more, and a gear comprised of case-hardening steel and having an X-ray diffraction half width at a depth of 50 mm from the surface of the gear of 6.4 degrees or more.

摘要翻译： 本发明提供了表面疲劳强度优异的表面硬化钢和使用其用于汽车，工程机械，工业机械等部件的齿轮，其是表面硬化钢，其表面疲劳强度优异，包括由 重量％，C：0.1〜0.3％，Si：1.0〜2.0％，Mn：0.3〜2.0％，S：0.005〜0.05％，Cr：1.0〜2.6％，Mo：0.8〜4.0％，V：0.1〜 ％，Al：0.001〜0.2％，N：0.003〜0.03％，将P限制在0.03％以下，余量为铁和不可避免的杂质，满足下式：31Si（％）+ 15Mn（％） + 23Cr（％）+ 26Mo（％）+ 100V（％）为100以上，由外壳硬化钢构成的齿轮与齿轮表面的距离为50mm的X射线衍射半值宽度 为6.4度以上。

公开(公告)号：US20060130935A1

公开(公告)日：2006-06-22

申请号：US11296566

申请日：2005-12-08

申请人： Atsushi Hattori ,  Takashi Kano ,  Tomoko Serikawa ,  Koki Mizuno

发明人： Atsushi Hattori ,  Takashi Kano ,  Tomoko Serikawa ,  Koki Mizuno

IPC分类号： C23C8/22

CPC分类号： C23C8/80 ,  C23C8/22

摘要： This invention aims to provide a carburized component realizing a larger strength for power transmission components such as gears, and a method of manufacturing the same. The carburized component of this invention, aimed at realizing the object, consists essentially of, in % by mass and both ends inclusive, C: 0.1-0.30%, Si: 0.80-1.50%, Mn: 0.30-1.20%, Cr: 2.0-5.5%, and the balance of Fe and inevitable impurities; has a mean C concentration over the range from the surface of the steel to a depth of 0.2 mm after vacuum carburization of 1.2% or more and 3.0% or less, and has a ratio of a carbide area over the range from the surface to a depth of 50 μm of 15% or more and 60% or less, has the carbide precipitated in a finely dispersed manner so that the carbide having a grain size of 10 μm or less accounts for 90% or more of the entire portion, and has a depth of a grain boundary oxide layer below the surface of 1 μm or less.

摘要翻译： 本发明的目的在于提供一种对齿轮等动力传递部件实现较大强度的渗碳部件及其制造方法。 旨在实现该目的的本发明的渗碳组分基本上由质量％和两端包括C：0.1-0.30％，Si：0.80-1.50％，Mn：0.30-1.20％，Cr：2.0 -5.5％，余量为Fe和不可避免的杂质; 在真空渗碳后，从钢表面到深度0.2mm的范围内的平均C浓度为1.2％以上且3.0％以下，并且具有从表面到a的范围内的碳化物面积的比例 深度50μm，15％以上且60％以下的碳化物，以微细分散的方式析出碳化物，使得粒径为10μm以下的碳化物占全部的90％以上，具有 在1μm以下的表面下方的晶界氧化物层的深度。