Method for low-temperature smelting of high-carbon and low-phosphorus steel in converter

Abstract

The invention discloses a method for smelting high-carbon and low-phosphorus steel by utilizing a converter at a low temperature. The method for smelting the high-carbon and low-phosphorus steel by utilizing the converter at the low temperature comprises the following steps: (1) carrying out blowing prophase control; (2) carrying out blowing metaphase control; and (3) carrying out blowing anaphase control. The method for smelting the high-carbon and low-phosphorus steel by utilizing the converter at the low temperature has the advantages that low temperature tapping is adopted, the problem that end points [C] and [P] can not meet tapping conditions at the same time can be effectively solved, furnace life of the converter can be improved, and refractory material consumption is directly reduced; a single slag process is adopted for slag-making, a process route is simple, safety and operability are strong, and easy control is realized; high tapping at the end point [C] is realized, oxygen content during tapping is reduced, and alloy consumption is reduced while quality of molten steel is improved; and pure oxygen supply time of the converter can be shortened by about 2 minutes, so that production efficiency of the converter is improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a method for smelting high-carbon and low-phosphorus steel in a converter at low temperature. Background technique [0002] When the converter smelts high-carbon steel varieties, the smelting end point control targets are high [C], low [P] and higher temperature. Generally, the end point temperature should be controlled at least above 1630 °C. However, it is difficult to achieve high [C], low [P], and higher temperatures at the smelting end point simultaneously. To achieve 100% high [C], low [P], and higher temperatures at the smelting end point, almost no iron and steel enterprise can do it. . High [C] tapping at the smelting end point requires reducing the oxygen supply of the converter. In actual smelting operations, lowering the oxygen supply intensity and increasing the position of the blowing gun are often used to achieve high [C] tapping, but reducing th...

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve high [C], low [P], and higher temperatures at the smelting end point simultaneously. To achieve 100% high [C], low [P], and higher temperatures at the smelting end point, almost no iron and steel enterprise can do it.

High [C] tapping at the end point of smelting requires reducing the oxygen supply of the converter. In actual smelting operations, lowering the oxygen supply intensity and increasing the position of the blowing gun are often used to achieve high [C] tapping, but reducing the oxygen supply intensity will directly cause the end point temperature Low, increasing the position of the blowing gun will cause the agitation of the molten pool to weaken and affect the P removal efficiency of the converter

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