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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火工艺的研究比较少。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:将加热段加热温度调整到1 190～1 260℃,平均温度达到1 230℃;加热段保温时间2.5h,可使带状级别控制到2级以下,使碳化物液析控制在0.5级以下,提升了产品的内在质量。
Bearing steel before rolling high-temperature diffusion annealing of the ingot to eliminate carbide fluid analysis, to improve the carbide strip is an extremely crucial process, the previous study of die-cast bearing steel more, and the continuous casting of high-temperature diffusion annealing Process less research. In this paper, according to the high temperature diffusion process of continuous casting billet - the relation between heating temperature and time, the liquidusation of carbide and the ribbon of carbide, the suitable heating system was determined by combining the heating ability of workshop heating furnace: The heating temperature is adjusted to 1 190 ~ 1 260 ℃, the average temperature reaches 1 230 ℃; heating period 2.5h, the ribbon level can be controlled below 2, so that the control of liquid carbide in the liquid below 0.5, to enhance The inherent quality of the product.