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摘要:为了进一步提高生产效率、降低生产成本,同时减少大尺寸夹杂物超标,提出了采用“BOF-RH-CC”路线生产车轮钢工艺。通过系统地实验室试验与工业试验,研究了“BOF-RH-CC”工艺路线下的硫含量、温度以及夹杂物控制等关键技术问题。结果表明:在KR工序通过采用新型脱硫剂,可以将84%炉次的铁水硫的质量分数控制在10×10-6以下;在转炉工序回硫主要影响因素为KR脱硫渣,当扒渣率为95%时,KR渣带硫量占入炉总硫量比例达到了26.7%,而当扒渣率在99%时,KR渣对转炉回硫仅占6.8%,应当保证KR处理后顶渣去除率控制在99%以上;在精炼RH工序当RH吹氧升温量不大于100m3,不仅满足温度要求,同时也达到了洁净度的要求;在低氧条件下将夹杂物控制为高熔点且不易变形的CaS-Al2O3类夹杂,降低了钢种大尺寸夹杂的数量。通过上述研究,在“BOF—RH—CC”工艺路线下,可将成品钢中硫的质量分数和TO的质量分数分别控制在20×10-6和12×10-6以下,同时钢中大尺寸夹杂物数量降低了50%,满足钢种对硫含量、温度及夹杂物的要求,实现了该工艺的稳定控制。 相似文献
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《钢铁研究学报(英文版)》2016,(7):647-654
The effects of some key factors on nitrogen absorption during the smelting process of X70 pipeline steel were studied,and the source of nitrogen pick-up was analyzed to find the bottleneck for nitrogen control.A series of measures were put forward to decrease the nitrogen pick-up.The results indicated that an exponential relationship existed between the nitrogen absorption index and the free oxygen in molten steel.Nitrogen absorption index could decrease below 0.3when free oxygen in molten steel was above 100×10~(-6) after tapping.For low sulfur killed steel,the nitrogen absorption ratio and sulfur content satisfied a linear relationship with a slope of-0.007.Low free-oxygen and sulfur were beneficial to the deep desulfurization during vacuum treatment.The contradiction of high desulfurization ratio and low nitrogen pick-up during LF process could be resolved by skimming oxidizing slag after tapping and making new high basicity top slag.After optimization,the average content of nitrogen in final product decreased from 46×10(-6)to 35×10(-6). 相似文献
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通过技术选型和对铁水复合脱硫的系统研究,选择了合适的操作和设备参数,并在调试中对操作参数进行不断的优化,使铁水复合脱硫技术在济钢一炼钢顺利实施,铁水硫的质量分数由0.035%下降到0.005%,而且脱硫剂消耗低于其他同类钢厂。 相似文献
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天铁为满足市场要求,通过对铁水预处理工艺控制硫的含量、优化转炉终点控制、LF带氧加热、RH真空脱碳工艺控制碳、氮含量的等工艺研究和探讨,研制开发出GE01-TS钢种。该产品能够满足冷轧薄板轧制工艺要求。 相似文献