| 摘要 |
The present invention provides a high-strength wear-resistant steel plate with Brinell hardness of ‰¥HB420, comprising the following chemical compositions ( by weight %) C: 0.205-0.25%, Si: 0.20-1.00%, Mn: 1.0-1.5%, P‰¤0.015%, S‰¤0.010%, Al: 0.02-0.04%, Ti: 0.01-0.03%, N‰¤0.006%, Ca‰¤0.005% , and more than one of Cr‰¤0.70%, Ni‰¤0.50%, Mo‰¤ 0.30%, other compositions being Ferrum and unavoidable impurities. The manufacturing method of the wear-resistant steel plate comprises heating the continuous casting slab or billet at temperature of 1150-1250°C, then rolling it in austenite recrystallization zone and non-recrystallization zone, with the total reduction ratio being no less than 70% and the rolling finishing temperature being no less than 860°C; water-cooling rapidly the rolled steel plate at speed of Vminˆ¼50°C/s to the temperature range Ms-145ˆ¼Ms-185°C, then air-cooling it to ambient temperature. The finished steel plate with a thickness of 6-25mm has a structure of martensite and residual austenite (5-10%), a hardness of‰¥HB420, a yield strength of ‰¥ 1000MPa, an elongation of‰¥ 18%, A kv at -40°C of ‰¥27J and good cool bending property, especially, has remarkable TRIP effect in use, improving substantially its wear resistance, thereby meeting the high demand for wear-resistant steel plates in related industries. |
