材料期刊网

薄板坯连铸连轧流程钢水凝固速率高，铸坯在炉温度低、时间短，道次压下量大，有助于抑制化学成分偏析、细化非金属夹杂物、降低表面脱碳、减小珠光体片层间距，一定程度上缓解了传统流程生产高碳板带钢存在的问题，适于生产高质量的高碳钢板带。采用金相显微镜、扫描电镜等方法分析了薄板坯连铸连轧流程生产的中高碳钢的微观组织，结果表明：碳的最大偏析度为1.16，较传统流程的2.0有明显改善；单面脱碳层深度小于板带厚度的1.0%，为传统流程脱碳层深度的30%~60%；珠光体片层间距显著减小，有利于提高材料的综合性能。基于薄板坯连铸连轧流程已开发出中高碳优质碳素钢、碳素工具钢、弹簧钢、合金结构钢及合金工具钢，最高碳的质量分数达到1.0%，产品已广泛应用于汽车制造、工程机械、特种设备、高端锯片以及专用器具等领域。

Thin slab casting and direct rolling process (hereinafter referred to as “TSCR”), characterized by high liquid steel solidification rate, low heating temperature and short stay time in the roller-hearth furnace and high pass reduction, was helpful to inhibit the segregation of chemical composition, refine the non-metallic inclusions, lower surface decarburization, reduce the inter-laminar distance of pearlite, and alleviate to some extent the problems that traditional production process had in producing high-medium carbon steel strips. Consequently, TSCR was a suitable process for producing high-quality high-carbon strips. The microstructure of high carbon steel produced by TSCR process was investigated by optical microscope, scanning electron microscopy and other methods. The results show that: maximum carbon segregation rate is 1.16, much lower than 2.0 of traditional process, its single face decarburization depth is less than 1.0% of strip’s thickness, only 30%-60% of that of traditional process, its pearlite inter-laminar distance is much smaller than that of traditional process, which are favorable for increasing the overall performance of the materials. High-medium carbon steels, such as high quality carbon steel, high carbon tool steel, spring steel, alloy structure steel and alloy tool steel, with carbon content up to 1.0%, can be produced by TSCR process and can also be widely used in industries such as automotive manufacturing, engineering machinery, special equipment, high-end blade and special tools.