热轧工艺参数对汽车梁用钢表面氧化铁皮结构的影响

Investigation on the Effects of Hot Rolling Process Parameters on the Oxide Structure of Steel Strips for Automobile Frame

以热轧铌微合金化汽车梁用钢为研究对象,分别进行了氧化动力学和热模拟实验,研究了热轧工艺参数对热轧板表面氧化铁皮结构的影响。实验表明,汽车大梁钢在700℃时氧化增重随时间呈直线变化,而高于800℃时按抛物线规律变化。在热模拟实验中,模拟了从精轧到卷取段的氧化铁皮的生成情况。随着开轧温度的升高,Fe_3O_4层的比例逐渐增大;随着终轧温度的升高,Fe_3O_4+FeO共存层的厚度逐渐减小;Fe_3O_4+FeO共存层的比例随着卷取温度的降低而增大。

Oxidation kinetics and thermal simulation experiments were conducted to investigate the effects of process parameters on the structure of oxide scale for hot rolled Nb micro-alloyed steel strips for automobile frame. It has been suggested that oxide gain increased linearly with time at 700℃ while increased parabolically with time above 800℃. The evolution of oxide scale from finish rolling to coiling was simulated. Results have shown that the proportion of Fe3O4 in oxide scale gradually increases with the increasing of start roiling temperature. The thickness of Fe3o4 ＋FeO layer gradually decreased with increasing of finish roiling temperature. And the proportion of Fe3O4＋FeO layer increased with the decreasing of coiling temperature.