公开(公告)号：US20140034194A1

公开(公告)日：2014-02-06

申请号：US13982594

申请日：2012-01-26

申请人： Hideki Imataka ,  Masato Yuya ,  Yuya Gyotoku ,  Atsushi Kobayashi ,  Susumu Maeda

发明人： Hideki Imataka ,  Masato Yuya ,  Yuya Gyotoku ,  Atsushi Kobayashi ,  Susumu Maeda

IPC分类号： C22C38/50 ,  C22C38/46 ,  C22C38/44 ,  C22C38/28 ,  C22C38/00 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C23C8/26 ,  C22C38/24

CPC分类号： C22C38/50 ,  C21D1/06 ,  C21D9/32 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/44 ,  C22C38/46 ,  C23C8/26

摘要： A steel for nitriding having a chemical composition consisting of, by mass percent, C: 0.07-0.14%, Si: 0.10-0.30%, Mn: 0.4-1.0%, S: 0.005-0.030%, Cr: 1.0-1.5%, Mo: ≦0.05% (including 0%), Al: 0.010% or more to less than 0.10%, V: 0.10-0.25%, optionally at least one element selected from Cu: ≦0.30% and Ni: ≦0.25% [0.61Mn+1.11Cr+0.35Mo+0.47≦2.30], and the balance of Fe and impurities. P, N, Ti and O among the impurities are P: ≦0.030%, N: ≦0.008%, Ti: ≦0.005%, and O: ≦0.0030%. The steel is easily subjected to cutting before nitriding and suitable for use as an automobile ring gear. The nitrided component having a surface hardness of 650-900 HV, core hardness being ≧150 HV, and effective case depth of ≧0.15 mm has excellent bending fatigue strength and surface fatigue strength although the content of Mo is as low as ≦0.05% and has a small amount of expansion caused by nitriding.

摘要翻译： 按质量％计含有C：0.07-0.14％，Si：0.10-0.30％，Mn：0.4-1.0％，S：0.005-0.030％，Cr：1.0-1.5％的化学组成的氮化氮钢， Mo：≤0.05％（包括0％），Al：0.010％以上至小于0.10％，V：0.10-0.25％，任选至少一种选自Cu：0.30％和Ni：0.25％的元素[0.61 Mn +1.11Cr+0.35Mo+0.47@2.30]，余量为Fe和杂质。 杂质中的P，N，Ti和O分别为P：@ 0.030％，N：0.008％，Ti：0.005％，O：0.0030％。 钢在氮化之前易于切割，适用于汽车齿圈。 表面硬度为650-900HV，芯硬度> 150HV，有效壳深度≥0.15mm的氮化组分具有优异的弯曲疲劳强度和表面疲劳强度，尽管Mo的含量低至≤0.05 ％，渗氮少量膨胀。