Use of hardened steel having superior tooth surfaces duration of strength, these using a gear wheel, and method for producing the same

摘要

The present invention is case-hardened steel having superior tooth surfaces duration of strength and a these -use gear, which for parts of motor vehicles, construction equipment, industrial machines, etc, is used, ready, i.e, a case hardening steel with outstanding tooth surfaces duration of strength, the in percent by weight: 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%, wherein p on 0,03% or less is limited, and the remainder being iron and unavoidable impurities, and the following equation, 31si (%) + 15mn (%) + 23cr (%) + 26mo (%) + 100v (%) is 100 or more, and a gear wheel composed of a case-hardened steel with an x-ray diffraction - 3 db beam width in the case of a depth of 50 μm of the gear wheel surface of 6,4° or more.