Effects of heat treatment on properties of multi-element low alloy wear-resistant steel

The paper has studied the mechanical properties and heat treatment effects on multi-element low alloy wear-resistant steel (MLAWS) used as a material for the liner of rolling mill torii. The results show that when quenched at 900-920℃ and tempered at 350-370℃, the MLAWS has achieved hardness above 60 HRC, tensile strength greater than 1 600 MPa, impact toughness higher than 18J/cm2 and fracture toughness greater than 37 MPa·m1/2. When the quenching temperature is lower than 900℃, the hardness of the MLAWS increases with the temperature. When the quenching temperature is higher than 900℃, the hardness decreases with the increase of temperature. At a quenching temperature below 920℃, the effect of quenching temperature on the impact toughness is not obvious. In quenching at above 920℃, impact toughness decreases as the temperature increases. When the tempering temperature is exceeding 450℃, the hardness begins to decrease significantly. Tempering at 350℃ has produced the best wear resistance on the MLAWS.

Study and Application of Heat Treat ment of Multi-Element Wear-Resistant Low-Alloy Steel

The effects of heat treatment on the properties of multi element wear-resistant low-alloy steel （MLAWS） which is used to make the liner of rolling mill torus were researched. The results show that when quenching temperature is lower than 900℃, the hardness increases with the increase of temperature, and when quenching temperature is higher than 900℃, the hardness decreases with the increase of temperature. As quenching temperature is lower than 920℃, the effect of quenching temperature on the impact toughness is not obvious. When quenching temperature is higher than 920℃ , impact toughness decreases with the increase of temperature. When tempering temperature is higher than 450 ℃ , the hardness begins to decrease obviously. After tempering at 350℃, the best wear resistance was obtained. According to the service condition of rolling mill torus liner, the MLAWS is quenched from 900-920 ℃ and tempered at 350-370℃.

热处理对轧机牌坊衬板材料性质的影响

研究了热处理工艺对多元素低合金钢力学性能的影响。结果表明，此钢经900－920℃淬火．并在350－370℃回火后，其硬度可达60HRC以上，抗拉强度达1600MPa以上，冲击韧性达18J／cm^2以上，断裂韧性达37MPa·m^1/2以上：当淬火温度低于900℃时，合金钢的硬度会随温度的上升而提高；当淬火温度高于900℃时．合金钢的硬度就会随温度的上升而降低。在一定范围内，若淬火温度低于920℃。淬火温度对冲击韧度的影响并不明显。若淬火温度高于920℃．冲击韧度就会随温度的升高而降低。若回火温度在450℃以上，合金硬度就开始有明显下降。350℃是回火的最佳温度。此温度下制成的合金钢耐磨性最好。

多元低合金耐磨钢热处理工艺研究

研究了热处理工艺对制造轧机牌坊村板的多元低合金耐磨钢力学性能的影响。结果发现淬火温度低于900℃时，多元低合金耐磨钢硬度随淬火温度升高而升高，高于900℃时，硬度反而下降。淬火温度低于920℃时，温度对冲击韧性影响不明显，淬火温度高于920℃时，冲击韧性略有下降。回火温度高于450℃时，硬度明显降低。随着回火温度升高，冲击韧性和断裂韧性提高。回火温度高于400℃时，延伸率和断面收缩率大幅度提高。350℃回火后耐磨性最好。根据轧机牌坊村板的使用工况，建议多元低舍金耐磨钢采用以下热处理工艺：900～920℃雾冷淬火和350～370℃回火。