Scientific steelmaking boosts Shougang steel ladle bottom blowing process

As of December 10, Shougang Water Steel's first steelmaking region smelted 42729 kiln furnaces this year. The qualification rate for bottom blowing of the ladle has been 100% for 12 consecutive months since December 2010. This achievement has brought about a qualitative improvement in the technological level of argon blowing at the bottom of the steel ladle, which has created favorable conditions for the production of variety steel, improvement of the physical quality of steel products, and reduction of production costs. It is also a steelmaking plant that implements scientific steelmaking research and management. The result of innovation.

At the end of the ladle, argon is blown through inert gas such as argon into the molten steel through a gas-permeable brick installed at the bottom of the ladle, so that the molten steel generates a circulation in the ladle, and the molten steel is fully stirred to make the composition and temperature of the molten steel uniform. It is beneficial to float inclusions in molten steel and improve the cleanliness of molten steel. Compared with top-blown argon, bottom-blown argon can achieve argon blowing during tapping and play an important role in improving the argon blowing effect of molten steel. Therefore, it is of great significance to master and use the bottom-blown argon technology for the production of water-steel varieties and “double-high” products, as well as for improving the market competitiveness of water-steel.

Before March 2010, the pass rate of a bottom end of a steelmaking was only about 40%, and the remaining 60% needed to be compensated for by top blowing. In order to improve the physical quality of steel, the steel mill is determined to cancel top-blown argon. In order to ensure that the bottom blowing is 100% qualified, the factory took timely measures to scientifically make steel and solve the technical and management problems of using all the bottom blows to ensure stable production. Firstly, strict acceptance standards were established to strictly control the entry of air-breathing bricks into the factory; secondly, a large amount of data analysis was conducted to identify various reasons that affected the bottom blowing of the ladle, and an online turnover ladle air-permeable brick cleaning system was formulated to complete the molten steel for each furnace. After the ladle is carefully cleaned.