Efficient smelting technology for producing low-phosphorous clean steel through converter

Abstract

The invention discloses an efficient smelting technology for producing low-phosphorous clean steel through a converter. According to the technology, furnace slag of last furnace is subjected to slag splashing treatment, final slag is totally or partially left in the furnace, raw materials are added for smelting, during the one-time gun going and blow beginning stage, the gun position and flow of an oxygen gun are controlled, after the gun goes down and is ignited, an iron oxide ball adding and mine returning begin, then lime and light calcined dolomite are added, after all is added, the gun position is gradually hoisted up, and slag is poured; and the gun position and flow of the oxygen gun are controlled secondly, after fire is on, the lime begins to be added, the slag is adjusted in time, the position and the oxygen supply amount of the oxygen gun are controlled, finally, furnace pouring is carried out, the gun is lifted, and finally, the furnace slag is totally left in the converterfor slag and phosphorous curing, and used for smelting in next furnace. According to the technology, the slag added when the converted smelts the low-phosphorous clean steel is adjusted in time, thegun position and the oxygen supply amount of the oxygen gun are controlled, the final point steel tapping condition can meet the high-cleanness low-phosphorous steel converter final point control condition with C larger or equal to 0.12% and P smaller than or equal to 0.006%.

Description

technical field [0001] The invention belongs to the field of metal material production, in particular to a high-efficiency smelting process for producing low-phosphorus clean steel by a converter. Background technique [0002] In recent years, with the increasing demand of users for low-phosphorus high-quality steel products, more and more steel types require lower content of impurity elements. How to smelt low-phosphorus clean steel at the lowest cost is the field of steelmaking. The focus of the research. At present, the major iron and steel enterprises in Japan and some domestic enterprises widely adopt the converter "duplex method" (LD-NRP method of JFE, SRP method of Sumitomo Metal, H furnace of Kobe Steel, BRP method of Baosteel) operation process, but the The process has high requirements on equipment; there is also an operation mode of continuous dephosphorization and decarburization blowing of molten iron on the same converter, similar to the traditional double sla...

AI Technical Summary

Problems solved by technology

[0003] However, the early slag removal rate of the current low-phosphorus steel smelting process of the converter is generally low or unstable; The control fluctuation of the machine is large; it is difficult to ensure the carbon content of the end point C (C≥0.12%) while obtaining a lower P content (≤0.006%) at the end point; Less consideration; pay attention to dephosphorization in the smelting process, but do not pay much attention to the phosphorus fixation technology at the end point; the oxygen consumption and cycle of smelting with less slag are generally high; the erosion of the furnace bottom and furnace lining or The instability problem caused by accumulation is more prominent