Study on Heat Treatment Technology of the Working Layer Materials of Rolling Mill Liner

The effects of heat treatment on the properties of working layer material of wear resistant compound liner in hot continuous steel pipe rolling mill are researched. The results show that the hardness of the material increases as the quenching temperature rising, and then turn decreasing at 900℃. At the temperature below 920℃, the effect of quenching temperature on the impact toughness is negligible and when the quenching temperature is over 920℃, the impact toughness decreases gently. The impact and fracture toughness increase as tempering temperature rising but at 450℃, the hardness begins to decrease obviously. The wear resistance reaches the highest at 350℃ obtained. The optimum heat treatment technology of working layer material is quenching at 900~920℃ and tempering at 350~370℃.