| 摘要 |
Steel composition comprises: carbon (0.19-0.60%); silicon (0.70-1.10%); manganese (1.10-1.50); chromium (1-1.50); nickel (trace amount to 0.30%); molybdenum (0.10-0.30%); sulfur (0.001-0.020%); phosphorus (trace amount to 0.025%); aluminum (0.010-0.045%); nitrogen (0.01-0.03%); niobium (0.010-0.045%); and titanium (trace amount to 0.005%); optionally bismuth (trace amount to 0.10%), lead (trace amount to 0.12%), tellurium (trace amount to 0.15%), selenium (trace amount to 0.02%), and/or calcium (trace amount to 0.0050%), and iron and impurities (balance quantity). An independent claim is included for a mechanical steel part, preferably steel roll comprising the steel composition, and undergoing cementing and carbonitration treatment. |
