DEVELOPMENT AND APPLICATION OF THE HIGH-STRENGTH WEAR-RESISTANCE STEEL USED FOR THE LIGHTWEIGHT HEAVY-DUTY DUMP MINING TRUCK

摘要

Shougang Group has developed advanced high-strength wear-resistance steel of NM450 by using Nb-Mo-Cr-Ti-B micro-alloyed design and two-stage rolling and quenching and tempering process. In spite of high strength, the toughness and weldability of the steel was improved by reducing the carbon equivalent. For the high-strength wear-resistant steel, the yield strength is higher than 1100MPa, the tensile strength is higher than 1350MPa, the elongation is greater than 15%, the low temperature(-40°C) impact energy value is not less than 60J,and the Brinell hardness value of surface is more than 430HB. The abrasion resistance of NM450 is five times of that of the Q235.The high-strength wear-resistance steel is successfully applied in Shougang SGE150~R heavy dump body to replace the plain carbon steel Q235, resulting in the reduction of body weight, the improvement of the life of the mine car and the reduction of the transportation costs.