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Phosphorus steel smelting method for a top-bottom combined blowing converter

A technology of top-bottom double blowing and smelting method, applied in the direction of manufacturing converters, etc., can solve the problems of low oxygen utilization rate, high cost of adding flux and alloy, long blowing time, etc., and achieves improved oxygen utilization rate, convenient control, The effect of shortening the smelting time

Active Publication Date: 2016-02-03
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Phosphorus-containing steel refers to steel with a phosphorus content in the range of 0.06% to 0.09%. According to the normal smelting process, the cost of adding flux and alloy during smelting is high, the oxygen utilization rate is low, and the blowing time is long.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The SPA-H steel grade is produced by the 260t converter with combined top and bottom blowing, and the smelting number is AD1872. The product composition is as follows according to the mass fraction requirements: C: 0.06-0.08% Si: 0.25-0.35% Mn: 0.40-0.50% P: 0.07-0.09% S: ≤0.008% By increasing the pressure of oxygen blowing, stirring at a low lance position, increasing the flow rate of bottom blowing gas and smelting with a very small amount of slag, the purpose of shortening the blowing time of the double blowing converter and quickly decarbonizing and maintaining phosphorus is realized.

[0026] The specific steps are as follows: the phosphorus content of molten iron is 0.098%, the phosphorus-containing steel is smelted using a double-blown converter, the oxygen supply pressure is 1.03Mpa, and the oxygen supply intensity is 3.6m 3 / (t.min); 3 minutes after the start of blowing, add active lime according to 7.5kg / t of steel, add light-burned dolomite according to 7.0kg / ...

Embodiment 2

[0030] The 09CuPCrNi-A steel grade is produced by a 260t converter with combined top and bottom blowing. The melting number is 14BD2351. The product composition is as follows according to the mass fraction requirements: C: 0.06-0.08% Si: 0.25-0.35% Mn: 0.40-0.50% P: 0.06-0.08 %S: ≤0.006% By increasing the oxygen blowing pressure, stirring at a low lance position, increasing the flow rate of bottom blowing gas and smelting with very little slag, the purpose of shortening the blowing time of the double blowing converter and quickly decarbonizing and maintaining phosphorus is realized.

[0031] The specific steps are as follows: the phosphorus content of molten iron is 0.08%, the phosphorus-containing steel is smelted using a double-blown converter, the oxygen supply pressure is 1.03Mpa, and the oxygen supply intensity is 3.6m 3 / (t.min); 3 minutes after the start of blowing, add active lime according to 7.1kg / t of steel, add light-burned dolomite according to 7.0kg / ton of steel, ...

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Abstract

The invention relates to a phosphorus steel smelting method for a top-bottom combined blowing converter. The method comprises the following steps that (1) the phosphorus content of molten iron is 0.08-0.12%, the oxygen supply pressure is 1-1.05 MPa, and the oxygen supply intensity is 3.5-3.8 m<3> / (t.min); (2) when converting is conducted for 1-3 min, and active lime and light burned dolomite are added; 1 min is delayed, and iron-containing material carbon balls are added; (3) an oxygen gun adopts a high-low-low gun position, and an automatic N / Ar switching mode is adopted for bottom blowing; (4) the nitrogen bottom-blowing mode is adopted for medium combined-blowing at the early stage and the medium stage, and the argon bottom blowing mode is adopted at the later stage of converting and 1-2 min before carbon catching; the converting final temperature is controlled within 1660-1680 DEG C, and the content of end point carbon is controlled within 0.04-0.06%; the content of end point phosphorus is controlled within 0.05-0.075%; and (5) the content of finished phosphorus is controlled within 0.06-0.09%. Compared with the prior art, the phosphorus steel smelting method has the beneficial effects that the converting time is shortened by improving the phosphorus steel smelting process for the top-bottom combined blowing converter, and the blowing converter can conduct decarbonization and phosphorus preservation rapidly; the oxygen utilization rate is increased, the smelting time is shortened, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking technology, in particular to a method for smelting phosphorus-containing steel in a top-bottom combined blowing converter. Background technique [0002] Phosphorus-containing steel refers to steel with a finished phosphorus content in the range of 0.06% to 0.09%. According to the normal smelting process, the cost of adding flux and alloy during smelting is high, the oxygen utilization rate is low, and the blowing time is long. Contents of the invention [0003] The invention overcomes the deficiencies of the prior art and provides a method for smelting phosphorus-containing steel in a top-bottom combined blowing converter. By adjusting the process parameters, the amount of flux added is reduced, the cost of flux and alloy input is reduced, the smelting cycle is shortened, and the utilization rate of oxygen is improved. the goal of. [0004] In order to achieve the above object, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35
Inventor 王小善张志文梅雪辉赵志刚王鹏飞刘振中李冰郭猛毛志勇高洪涛朱国强
Owner ANGANG STEEL CO LTD
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