轧钢助卷辊和深弯辊堆焊技术研究

采用YJ356-S和YJ358-S焊丝分别堆焊修复轧钢助卷辊和深弯辊,并详细研究了堆焊工艺.助卷辊堆焊层组织为回火马氏体 少量的贝氏体和索氏体,并在马氏体基体上含有高硬度碳化物;深弯辊堆焊层组织为回火马氏体 弥散分布碳化物.回火处理后,助卷辊工作层硬度(HRC)达到59.9,深弯辊工作层硬度达到63.1.磨损试验结果显示,YJ356-S堆焊金属的相对耐磨系数为0.105,YJ358-S堆焊金属的相对耐磨系数为0.121,都具有良好的耐磨性.另外,堆焊时加入电磁搅拌,有利于提高硬度并降低堆焊层的硬度落差,改善堆焊材料的耐磨性.

Study on Surfacing Technologies of Wrapper Rolls and Deep Camber Rolls Used for Rolling Mill

Adopting YJ356-S and YJ358-S welding wires developed by Welding Research Institute of MCC, the wrapper rolls and deep camber rolls used for rolling mill are repaired,and the surfacing technologies are par- ticularly researched.The surfacing microstructures of wrapper rolls are tempering martensite+bainite+sorbite +carbides,and that of deep camber rolls are tempering martensite+dispersion carbides.After tempering treatment,the hardness of the surfacing layer of wrapper rolls reaches 59.9HRC and that of deep camber rolls reaches 63.1HRC.The result of wearing test shows that the relative wear-resisting coefficients of YJ356-S and YJ358-S surfacing metals are 0.105 and 0.121 respectively,both have excellent wear resistances.In addi- tion,the electromagnetic stirring added in surfacing molten pool is help to increase the hardness and reduce the hardness difference of surfacing layer,it also improves the wear resistance of surfacing materials.