A method for controlling the smelting of low-carbon and low-silicon steel

Abstract

The invention relates to a low-carbon low-silicon steel smelting control method. The purposes of decreasing molten slag alkalinity and reducing active lime consumption and converter smelting cost are achieved through slag washing and modification in the steel tapping process of a converter and optimization of alloy adding sequence and time. The method includes the steps that (1) the active lime usage amount is reduced according to the liquid iron phosphorus content; (2) a compound modification material is added immediately after liquid steel flows into a liquid steel tank; whole-tank argon blowing is performed for 1 minute when steel output of the liquid steel tank reaches 1 / 2; deoxidation alloying is performed when the steel output of the liquid steel tank reaches 3 / 5; (3) the quantity of slags in the liquid steel tank at the later stage is controlled at the later stage of steel output; and (4) the liquid steel tank is conveyed to an argon blowing station for temperature measurement, argon blowing wire-feeding and sampling. Compared with the prior art, the low-carbon low-silicon steel smelting control method has the beneficial effects that (1) the dephosphorization in the tank is kept within 0.005% so that the requirement of finished steel for phosphorus can be met; (2) the molten slag alkalinity is reduced by 0.3 during smelting of the type of steel through the converter, and the active lime usage amount is reduced; (3) the operation is simple and convenient, process control is easy to achieve, and the cost and the quality are stable.

Description

technical field [0001] The invention relates to the technical field of converter low-cost smelting control, in particular to a low-carbon and low-silicon steel smelting control method. Background technique [0002] Because of its good tensile strength and ductility, low-carbon low-silicon steel still maintains good cold-rolled reprocessing performance after hot-rolling, so it is very popular among users and has become the new darling of the steel market. Low-carbon low-silicon steel typical steel composition is: containing C0.04 ~ 0.06%; containing Si≤0.03%; containing Mn0.12 ~ 0.14%; containing P≤0.020%; containing S≤0.020%; There are many smelting methods, but most of them are expensive. [0003] Low-carbon and low-silicon steel products require low carbon content. When LF refining process is adopted, the LF furnace treatment process tends to increase carbon, while the carbon control at the end of the converter is low, the oxygen value is high, and the oxygen activity of ...

AI Technical Summary

Problems solved by technology

Low-carbon low-silicon steel typical steel composition is: containing C0.04 ~ 0.06%; containing Si≤0.03%; containing Mn0.12 ~ 0.14%; containing P≤0.020%; containing S≤0.020%; A variety of smelting methods, but most of them are expensive