冒口参数对17CrNiMo6钢锭质量及利用率的影响

Influence of Riser Parameters on Ingot Quality and Utilization Rate of 17CrNiMo6

钢锭利用率是冶金企业的重要经济技术指标之一。针对某钢厂6.8吨17Cr Ni Mo6钢锭利用率偏低问题,采用上小下大敞口锭模、悬挂绝热板、添加保护渣及调整冒口参数等工艺,以提高钢锭利用率。利用Pro CAST软件对不同冒容比参数下的热传递、冒口钢液收缩、冒口凝固过程、缩孔深度及冒口缺陷的变化规律进行了数值模拟,探讨不同绝热板厚度和冒口浇高对钢锭质量的影响。研究结果表明,在原浇注温度和浇注速度条件下,把绝热板厚度从50 mm增加到80 mm,冒口浇高从350 mm降低到320 mm时,冒口缩孔尖细的底部深度由216.61 mm缩短到61.76 mm,冒容比由12%降至9.56%,且不会影响锭身质量。

The utilization rate of ingot is one of the most important economic and technical indexes of metallurgical enterprises. Aiming at the a steelworks low rate of utilization of 6.8 t steel ingot by 17CrNiMo6, the process measures were adopted such as using narrow-end-up ingot mould, hanging heat insulation board, adding slag and adjusting riser parameters in order to improve the utilization rate of steel ingot. The parameters of heat transfer, steel melt shrinkage, riser steel melt solidification process, shrinkage defect depth and riser defects were simulated by using ProCAST software, the effect of different insulation plate thickness and riser height on the quality of ingot was researched. The results show that under the conditions of the original of pouring temperature and pouring rate, with the thickness of insulation board increasing from 50 mm to 80 mm, pouring height decreasing from 350 mm to 320 mm, the bottom depth of the riser shrinkage decreased from 216.61 mm to 61.76rnm, the riser proportion decreased from 12% to 9.56% and the quality of ingot was not be affected.