低温加热工艺对热轧普碳钢生产影响度的分析

Analysis on effect of low temperature heating on production of hot rolled common carbon steel

武钢针对某热轧生产线普碳钢轧线成材率仅为96.5%,远低于国内同等热轧生产线98.3%控制水平的状况,现场根据氧化烧损规律,对亚共析钢SPHC采用低温加热工艺,通过降低二加、均热段温度40℃,使成材率提高1.03%,成品屈服强度、抗拉强度、屈强比、伸长率满足交货要求。采用低温加热工艺后,精轧机组轧制力明显增大,但在轧机轧制力承受范围内。将低温加热工艺推广应用于普碳钢的生产上,在节能降耗、减少金属烧损、提高带钢成材率方面取得了明显的经济效益。

The finished product rate of the common carbon steel wire in a hot rolling line of WISCO is only 96.5% ,which is far below the control level of the similar hot rolling line at home, 98. 3%. By adopting the low temperature reheating technology for the hy- po-eutectoid steel according to the law of oxidation burning loss, lowering temperature by 2 plus and maintaining the temperature of the soaking zone at 40℃ , the finished product rate is improved by 1.03% and the yield strength, tensile strength and yield/ strength ratio of the finished products all meet the product delivery specifications. Although the rolling force delivered from the finish rolling mill has obviously increased since adoption of the low temperature reheating technology, it is still within the bearable limit of the rolling mill. Since application of the low temperature reheating technology in production of the common carbon steel prominent economical efficiencies have been achieved in the energy saving and consumption reduction, reduction of metal burning loss and improvement in the yield of the finished steel strip.