Patent ID: 6071358
Filing Date: 2000-06-06
Classification: C21D,C22C,F16C,Y10S

Abstract:
A rolling contact device comprising:rolling elements of the rolling contact device; anda mated member of the rolling contact device which contacts said rolling elements and is rotated, rolled, slid or moved relative to said rolling elements,in which said mated member is made of carbon steel containing 0.6%-0.9% by weight of C, 0.1%-0.7% by weight of Si, 0.5%-1.1% by weight of Mn, 0.1%-0.6% by weight of Cr and with the remainder, apart from inevitable impurities being Fe, said mated member being subjected to a hardening heat treatment; andsaid rolling elements of said rolling contact device being made of an alloy steel containing Cr, and said rolling elements being subjected to a hardening heat treatment,wherein at least one of said mated member and rolling elements have an ideal critical diameter DI value calculated by satisfying a following equation in the range of 1.5-4.0 inches (38 to 101 mm), whereDI=(0.311.times.C %.sup.0.498).times.([0.7.times.Si %]+1).times.([3.33.times.Mn %]+1).times.([2.16.times.Cr %]+1).