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本文通过四年多冷轧带钢生产实践,对GCr15轴承钢小型冷轧辊(辊径在中φ100～300毫米之间)的双液淬火方法,进行了认真的研究,找到了双液淬火的最佳冷却系数。结果表明,GCr15钢冷轧辊经高温奥氏体化,水、油连续冷却后,再经低温回火,可以得到足够深的淬硬层(φ100至300辊径,淬硬层深度平均可达10～25毫米,至少占辊身半径的20至6.7％)和淬硬性(硬度高达HR_c64以上),且可避免淬火碎裂。对冷轧40Mn、65Mn和T10A等高碳工具钢冷带,也能满足工艺要求,这种方法的特点是:设备简单、操作方便、淬火工序少、周期短、质量可靠、成本低,对提高GCr15钢冷轧辊的接触疲劳性能和使用寿命具有显著的效果。
In this paper, four years of cold-rolled strip production practice, the GCr15 bearing steel small cold roll (diameter in the φ100 ~ 300 mm) between the two-liquid quenching method, a careful study to find the most important Good cooling coefficient. The results show that the GCr15 cold-rolled steel is austenitized at high temperature, continuously cooled with water and oil, and then tempered at low temperature to obtain a sufficiently deep hardened layer (φ100 to 300 roller diameters with an average hardened layer depth of 10 ~ 25 mm, at least 20 to 6.7% of the barrel radius) and hardenability (hardness up to HR_c64 or above), and quench cracking can be avoided. The cold-rolled 40Mn, 65Mn and T10A high-carbon tool steel cold band, but also to meet the process requirements, this method is characterized by: simple equipment, easy operation, quenching process, short cycle, reliable, low cost, to improve GCr15 steel cold roll contact fatigue performance and service life has a significant effect.