| 摘要 |
A bearing component made from a steel alloy comprising: from 0.5 to 0.7 wt.% carbon, from 1.4 to 1.8 wt.% silicon, from 1.7 to 2.1 wt.% manganese, from 0.05 to 0.4 wt.% molybdenum, from 1.1 to 1.5 wt.% chromium, from 50 to 200 ppm nitrogen, from 0 to 0.2 wt.% vanadium, from 0 to 0.25 wt.% nickel, from 0 to 0.3 wt.% copper, from 0 to 0.2 wt.% cobalt, from 0 to 0.05 wt.% aluminium, from 0 to 0.1 wt.% niobium, from 0 to 0.2 wt.% tantalum, from 0 to 0.025 wt.% phosphorous, from 0 to 0.015 wt.% sulphur, from 0 to 0.075 wt.% tin, from 0 to 0.075 wt.% antimony, from 0 to 0.04 wt.% arsenic, from 0 to 0.002 wt.% lead, up to 15 ppm oxygen, up to 50 ppm calcium, up to 20 ppm boron, up to 30 ppm titanium, and the balance iron, together with any unavoidable impurities, the steel alloy having a martensitic microstructure and optionally including one or more of retained austenite, carbides, nitrides and/or carbonitrides. |
