Branding practice of new generation steel manufacturing process products
Shougang Jingtang Company follows the theory of metallurgical process engineering and has constructed a new generation recyclable steel manufacturing process with dynamic and orderly,continuous and compact,and effi-cient and stable production by analyzing and integrating the metallurgical functions of each unit production process in the production process.It adopts advanced"blast furnace-converter"and"continuous casting-hot rolling"interface technologies,as well as generic technologies such as hot metal pretreatment,matching between converter and con-tinuous casting machine,optimizing and matching of steel refining,and high-efficiency continuous casting,to build a clean steel platform with high efficiency,low-cost,and stable production of high-quality steel.Through the continu-ous improvement of the scheduling model for the blast furnace-converter interface,the number of iron ladle turnover times has gradually increased from 3.8 times per day to more than 5.8 times per day,the temperature drop of hot metal has gradually decreased from 108.3 ℃ to 85.7 ℃,and hot metal charging accuracy(-0.5-0.5 t)has re-mained stable at over 98.5％.The continuous casting-hot rolling interface is based on the integrated platform of pro-duction and marketing,through the optimization of the rolling plan,the reduction of the blocking rate of the slab,and the online quenching technology of the slab,the hot charging rate of the hot rolling production line reaches 64.84％,and the hot charging rate of the medium-thick plate production line reaches 62.9％.In terms of specialized production,through reasonable optimization of process layout and differentiated equipment,specialized production lines with their own characteristics have been formed.The production line,represented by automotive sheet and tin-plate,uses high efficiency production and low oxygen control technology throughout the entire process,to control the treatment time of KR,the treatment time of converter and the vacuum treatment time of RH within 32.2,35,20 min,respectively.The casting speed of peritectic steel is increased to 1.7 m/min,the casting speed of tinplate is up to 2.0 m/min,basically achieving the matching between converter and continuous casting machine.The oxygen mass fraction of molten steel in the tundish is reduced from 0.002 8％to 0.001 5％.The thin slab casting and direct rolling line represented by MCCR achieves efficient and stable production of ultra-low sulfur steel with w([S])≤0.0012％,and low carbon and low silicon steel grades with w([Si])≤0.03％,w([S])≤0.001 5％,w([C])≤0.01％,and w(T[O])≤0.001％through ultra-clean steel technology.The surface quality of the pickled strip steel reaches the level of cold-rolled FB surface quality.For the medium-thickness plate production line represented by 9Ni steel,the slag system with ultra-high phosphorus distribution ratio and high-efficiency deep desulfurization,ni-trogen,oxygen,hydrogen and inclusion control technology have been developed.The sum mass fraction of the five impurity elements(P+S+N+H+O)is as low as 0.004 01％.By using the slab heavy reduction technology,the center porosity of 300 mm and 400 mm thick slabs is not greater than 0.5 grade.Shougang Jingtang Company fully leverages the advantages of the new generation process,led by strategic products such as automotive sheet and tin-plate,and has achieved first-time launches of a number of product technologies,realizing the brand concept of"mak-ing the best steel".
new generation of steel manufacturing processhigh qualityhigh efficiencyclean steel platformbranding
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