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降低热轧棒材的硬度有利于下游用户的加工。试验利用热模拟试验机研究终轧温度、轧后穿水以及冷床冷速对小规格20Cr Mn Ti H钢棒材的组织比例和硬度的影响。在轧后不穿水的情况下,终轧温度越低或者冷速越慢,轧材的铁素体体积分数越高,贝氏体体积分数越低,轧材的硬度也越低。轧后穿水能明显提高轧材的铁素体比例,降低贝氏体比例,从而大幅降低轧材的硬度。穿水轧材硬度小于217HBW,满足退火或高温回火材的硬度要求。
Reducing the hardness of the hot rolled bar is advantageous for the downstream user’s processing. Test The influence of finish rolling temperature, water penetration after rolling and cold bed cooling rate on the microstructure and hardness of small size 20Cr Mn Ti H steel bars was studied by using a thermal simulation tester. In the case of no water after rolling, the lower the finishing temperature or the slower the cooling rate, the higher the volume fraction of ferrite in the rolled material and the lower the volume fraction of the bainite, the lower the hardness of the rolled material. After rolling water can significantly improve the rolling of the ferrite ratio, reducing the proportion of bainite, thereby significantly reducing the hardness of the rolling material. Wear water hardness of less than 217HBW, to meet the annealing or high temperature tempering hardness requirements.