T12钢高压锅炉管150 mm x 150 mm连铸坯除鳞的工艺实践

分析了在邯钢现有装备下,含Cr、Ni、Mo等合金元素T12钢氧化铁皮不易除净的原因。通过对加热工艺参数优化试验、除鳞水箱喷嘴优化改造,选出了最优工艺方法以解决高压锅炉管铸坯除磷不净问题。经试验,150 mm×150 mm方坯加热时间控制在90～100 min,炉内残氧控制在2%以内,采取将相互干扰除鳞水环喷嘴封堵,喷射角度由原38°～40°减小至33°～35°等工艺,连铸坯除鳞后表面无氧化铁皮残留,成品无表面缺陷。

Process Practice on Descaling of 150 mm x 150 mm Cast Billet for T12 Steel High Pressure Boiler Tube

The reason of the oxide scale of T12 steel containing Cr, Ni, Mo and other alloy elements in not being easy to be removed under the existing equipment of Hangang has been analyzed. Through the experiments of heating process parameter optimization, descaling water tank nozzle optimization, the optimal process method is selected to solve the problem of unclean descaling of high-pressure boiler tube casting billet. After the test, the heating time of 150 mm x 150 mm square billet is controlled within 90 ~ 100 min, and the furnace residual oxygen is controlled within 2% , blocking the water ring nozzle of mutual interference descaling and decreasing nozzle jet angle from original 38° -40° to 33° ~35°, there is no scale residue on the surface of continuous casting billet after descaling, and there is no surface defect in the finished product.