Converter smelting process for 82B steel

Abstract

The invention discloses a converter smelting process for 82B steel and belongs to the technical field of steel smelting. The converter smelting process comprises the steps of mixing of converter molten iron, converter bottom argon blowing, process charging and end point charging. According to the technical scheme, single-slag operation is adopted for smelting the 82B high-carbon steel, so that at the converter smelting end point, the C content of molten steel is high, the P content of the molten steel is controlled, and the problems that with rising converter temperature, phosphorus in initial stage slag returns to the molten steel again, and consequently previous efforts are wasted are solved. Meanwhile, the initial stage slag contains a large amount of metal iron, is not poured during single-slag operation and is used until the end, waste of the metal iron is reduced greatly, consumption of slag making materials is also reduced, thus the smelting cost is reduced, and the smelting quality is improved.

Description

technical field [0001] The invention belongs to the technical field of steel smelting, and relates to a low-cost steel smelting process, in particular to a converter smelting process for 82B steel. Background technique [0002] Shuigang produces 82B wire rods for prestressed steel strands. It is made of molten steel smelted in a steel mill and cast into a billet, heated and rolled into a φ10-13mm wire rod in a steel rolling plant, then drawn into a φ5.05-5.10mm steel wire in a steel strand factory, and finally twisted. Made into strands. This steel strand is called prestressed steel strand, and it is widely used in large-scale projects such as dams, bridges, overpasses, and high-rise buildings. [0003] After Shuigang successfully developed and produced 82B wire rod, through careful operation and control in the smelting process and rolling process, 82B wire rod with clean steel quality and excellent performance was produced, but due to high production cost and high price, ...

AI Technical Summary

Problems solved by technology

In the double slag operation process, about 3 tons of initial slag should be poured out, and the total iron (TFe) content in the slag is 18% to 25%, with an average of 20%. The total iron consumption of each furnace of steel is about 600kg. With the initial slag poured out, it is wasted in vain, which increases the consumption of steel materials and increases the cost

[0005] In addition, the chromium element in molten iron is not fully utilized, the amount of silicon-calcium wire fed after LF refining is too large, the service life of the tundish is short, refractory materials are wasted, too many slabs are lost in continuous casting, and slabs are wasted, which also lead to high production costs. important reason

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