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通过严格控制冶炼、轧制过程,采取快速加热工艺及对Φ650 mm×1/Φ550 mm×1/Φ550 mm×4半连轧生产线的孔型系统重新进行设计、优化,莱钢成功开发了采用260 mm×300 mm大断面连铸坯生产φ70～φ75 mm规格GCr15轴承钢棒材。实践表明,该工艺合理可行、轧制过程稳定,且产品的各项性能指标均符合国家标准要求。
By strictly controlling the process of smelting and rolling, adopting the rapid heating process and redesigning and optimizing the pass system of Φ650 mm × 1 / Φ550 mm × 1 / Φ550 mm × 4 semi-continuous rolling production line, mm × 300 mm large cross section billet production φ70 ~ φ75 mm specifications GCr15 bearing steel bar. Practice shows that the process is reasonable and feasible, the rolling process is stable, and the product performance indicators are in line with national standards.