【作者】 龚坚； 王国年； 张涛； 吕勇博； 刘岩；

【Author】 Gong Jian Wang Guonian Zhang Tao Lv Yongbo Liu Yan(Shougang Corporation Co., Ltd.)

【机构】 首钢股份有限公司；

【摘要】 本文对首钢二炼钢板坯铸机提高拉速的工艺进行了研究,为适应1.2～1.3m/min拉速条件下稳定正常的生产,对结晶器冷却水量,浸入式水口参数,二冷比水量,振动参数,保护渣性能指标进行了调整。研究了拉速变化对结晶器热流密度的影响、提高拉速后对结晶器铜板温度的影响、矫直区铸坯表面温度变化、保护渣耗量的变化并对3个保护渣耗量经验公式进行了评价。通过采取以上措施,与0.8m/min拉速情况对比:铸坯表面纵裂发生率维持在同一水平,含Nb的微合金钢种一检合格率显著上升,铸坯内部质量维持在同一水平。板坯双流铸机改为单流铸机后,由于拉速的提高,板坯月产量达到了9万t的水平,达到了双流铸机的产量水平。更多还原

【Abstract】 This paper have researched on high-speed casting practice of conventional slab caster in shougang No.2 steelmaking plant. To meet the requirement of producing sucessfully in casting speed 1.2-1.3m/min, we have adjusted the mould cooling water density、the parameter of submerged enttry nozzle、secondary cooling water density、the parameter of viberation、the index of mould powder phsical and chemical properties. The relationship between casting speed and local heat flux mould、the copper plate temperature analysis in different casting speed、the differenc of slab corner temperature in bending segment at different casting speed、the consumption of mould powder difference were anaylzed. We also make the assecement of three regressed equation of mould powder consumption. With above development of process practice, the product quality and production effencience was achieved to high level. Comparing with casting speed of 0.8m/min, the surface crack ration of product and the inner quality of slab remain the same level, the product qualification rate of steel grade with Nb increased dramatically. With the casting speed rising, the product yielding receached ninty thousand tons per month under one strand which is the same product yielding under two strands.更多还原