Investigations on the Cast Boron Steel Guide Roller and Its Application in Steel Wire-Rod Mill

摘要

A new type of abrasion-resistant cast boron steel was developed based on the service conditions of the guide roller in the high-speed steel wire-rod mill. The lath martensite was its matrix and the broken Fe_2B and dispersive distributed TiB_2 were its wear resistant skeleton. The tensile strength, hardness, and impact toughness of cast boron steel quenched at 1000 deg C excel 750MPa, 54HRC, 14 J/cm~2, respectively. The guide roller made of this steel has high strength and wear resistance and excellent thermal fatigue resistance and it is reliable to use in the high-speed steel wire-rod mill. Its service life is 1.133 times longer than that of cast high chromium nickel alloy steel and corresponding to that of the sintered-carbide.