| 摘要 |
A bearing steel alloy comprising (by weight): 0.6-0.9 % carbon, 0.03-0.2 % silicon, 0.1-1.5 % manganese, 1.4-2.0 % chromium, 0.7-1.0 % molybdenum, 0.03-0.15 % vanadium, 0-0.25 % nickel, 0-0.3 % copper, 0-0.2 % cobalt, 0-0.1 % aluminium, 0-0.1 % niobium, 0-0.2 %, tantalum, 0-0.025 % phosphorous, 0-0.015 % sulphur, 0-0.075 % tin, 0-0.075 % antimony, 0-0.04 % arsenic, 0-0.002 % lead, up to 350 ppm nitrogen, up to 20 ppm oxygen, up to 50 ppm calcium, up to 30 ppm boron and up to 50 ppm titanium, with the balance being iron and any other unavoidable impurities. The steel has a bainitic or martensitic microstructure, optionally further including carbides, nitrides or carbonitrides. |
