钢筋切断钳是建筑和电工行业大量使用的工具,钳头如图1所示。要求刃口的硬度(?)HRC55～60,其余部分为HRC33～40。过去我们用GCr15钢作为钳头材料,锻坯经球化退火后粗加工,整体调质(840℃油淬,620℃回火HRC33～40),刃口经中频感应加热淬火(聚乙烯醇水溶液),180～200℃(?)回火,可达到技术要求,最后工序是磨削开刃。感应加热淬火后刃口的奥氏体晶粒度为(?).5级,剪切钢料的寿命大于1500 Steel cut off pliers is a tool widely used in construction and electrical industry, the clamp head shown in Figure 1. Requires the hardness of the edge (?) HRC55 ~ 60, the rest of the HRC33 ~ 40. In the past, we used GCr15 steel as the clamp head material, and the forged billets were coarsely tempered by the ball-and-anneal process. The whole steel was tempered (840 ° C oil quenched and 620 ° C tempered HRC33-40). The cutting edge was quenched by IF induction heating ), 180 ~ 200 ℃ (?) Tempering, to meet the technical requirements, the last step is grinding blade. Austenitic grain size of induction hardened cutting edge (?). 5, the life of shear steel greater than 1500