SPHC low-carbon type steel production technology

Abstract

The invention discloses an SPHC low-carbon type steel production technology. A following control method is adopted and comprises the steps that converter end point content low-level control is guaranteed on the premise that it is guaranteed that the converter end point temperature meets the requirements; the CAS refining effect is improved, slag inclusion adsorption is conducted, and meanwhile theRH station inlet oxygen content is decreased to ensure the pouring property of molten steel; a CAS argon blowing model is optimized, argon gas stirring pressure models in the different stages are made, therefore, full floating of inclusions is effectively promoted, and meanwhile the process temperature drop is reduced; RH low oxygen level control is achieved, the RH station inlet oxygen content is decreased, the RH residual oxygen content is precisely controlled, the aluminum consumption is reduced, and the production yield is indirectly decreased; and the continuous casting machine protective pouring argon gas flow is optimized, and the condition that the pouring property is influenced due to water port inclusion concentration is avoided. According to the SPHC low-carbon type steel production technology, the purposes that on the basis that a water port is not displaced in the pouring process, the continuous pouring number is increased, and meanwhile the production cost of the processes is reduced are achieved.

Description

Technical field [0001] The invention belongs to the field of steelmaking, and in particular relates to a production process of SPHC low-carbon steel grades. Background technique [0002] At present, the production process of iron and steel enterprises generally adopts molten iron pretreatment-converter-LF refining-slab continuous caster process for smelting. Although this kind of production process is relatively mature, it is prone to silicon recovery, phosphorus recovery and electrode carbon increase phenomenon, and at the same time refining Power consumption and slagging costs are high, and the cost of smelting per ton of steel is high. As a conventional hot-rolled product, SPHC low-carbon steel has a large market demand. Therefore, reducing the process cost is a problem that Zhuduo companies strive to solve. Among them, the short-flow smelting process has a significant effect on reducing costs and increasing efficiency. However, during the production process, the incoming oxy...

AI Technical Summary

Problems solved by technology

Therefore, reducing process costs is a problem that Zhuduo enterprises are focusing on solving. Among them, the short-process smelting process has a significant effect on reducing costs and increasing efficiency. However, in the production process, the oxygen content of SPHC steel grades entering the station is controlled as high as 600-800ppm, resulting in After the RH treatment, the oxygen level is higher, which indirectly leads to the addition of too much aluminum content, which has a great impact on the quality of molten steel and the castability of continuous casting. During the pouring process, the nozzle flocculation is serious. Replacing the nozzle caused serious flocculation. Simple replacement of the nozzle can no longer solve the pouring problem, resulting in single-flow production or even unplanned shutdown