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分析了不同强度级别螺栓用冷镦钢盘条不同初始组织形态对退火组织演变的影响。工业轧制试验结果表明:低温轧制SCM435钢得到的多边形铁素体、珠光体、贝氏体及少许马氏体组织不利于获得均匀分布的球状珠光体;Gleeble热模拟组织转变研究结果表明:低温形变后ML35钢晶粒明显偏细,且碳化物部分球化,有利于获得球状珠光体。
The effect of different initial microstructure on the microstructure evolution of annealed steel bars with cold-heading steel bars for different strength grades was analyzed. The results of industrial rolling test show that the polygonal ferrite, pearlite, bainite and some martensite obtained by low temperature rolling SCM435 steel are not conducive to obtain uniform spherical pearlite; Gleeble thermal simulation of the organizational transformation results show that: ML35 steel grains are obviously thinner after low temperature deformation, and the carbide part is spheroidized, which is good for obtaining spherical pearlite.