GCr15钢加热工艺与液析、带状的关系

轴承钢在轧制之前对钢锭进行高温扩散退火对消除碳化物液析、改善碳化物带状是极其关键的一道工序，以前对模铸轴承钢研究较多，而对连铸坯的高温扩散退工艺的研究比较少。此文针对连铸坯的高温扩散工艺-加热温度和时间与碳化物液析、碳化物带状的关系进行了研究，结合车间加热炉的加热能力，确定了比较合适的加热工艺制度：将加热温度调整到1200～1280℃，加热时间接近5小时，可使带状级别控制到2级以下，使碳化物液析得到消除，提升了产品的内在质量，有重要的经济价值，并对我国连铸轴承钢连铸坯的高温扩散工艺有一定的参考价值。

Relationship of Liquefaction and Ribbon With GCr15 Steel Heating Process

Bearing steel should be annealed at high temperature before rolling to eliminate carbide liquefaction and ribbon.The diffusion annealing of bearing steel ingot had been studied very much but that of continuous cast bloom not.In the article the relationship between carbon liquefaction and ribbon and heating diffusion process temperature has been studied for continuous cast bloom.Combining with the heating furnace capacity,the appropriate system of heating processes was determined:the heating temperature should adjust to 1 190～1 260 ℃ in the heating section,the average temperature reaches 1 230 ℃;heating section holding time 2.5 hours.The carbide ribbon can be controlled to below level 2,and the carbide liquefaction below level 0.5.