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Converter smelting method for improving end molten steel remainder Mn with medium-high-Mn, high-P and low-Si molten iron

A converter smelting, high-phosphorus technology, applied in the field of medium-high-manganese, high-phosphorus, low-silicon molten iron to increase residual manganese in molten steel at the end point, and in the field of converter smelting, to reduce the amount of addition, improve the dephosphorization effect of smelting slag, and reduce the effect of returning phosphorus to molten steel

Active Publication Date: 2018-12-28
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most domestic steel mills basically use low-Mn and low-P molten iron with the following chemical composition (Mn≤0.55wt%, Si 0.25-0.45wt%, P≤0.085wt%). There are certain research reports on the converter smelting process of the residual Mn content of molten steel at the end point, but the use of medium-high manganese and high phosphorus with the following chemical composition (Mn0.90-1.15wt%, Si 0.05-0.15wt%, P 0.100-0.130wt%) There is no relevant research report on the converter smelting method of low-silicon molten iron to increase residual manganese in molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A. Smelting and loading process: after the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, according to 4.0kg / t 钢 The amount, add conventional active lime to the converter; according to 55kg / t 钢 The ratio of steel scrap is loaded into a 50-ton LD converter with the following mass ratios of steel scrap: C 0.20wt%, Si 0.35wt%, Mn 1.20wt%, P 0.035wt%, S 0.028wt%, the rest is Fe and unavoidable impurity; according to 50kg / t 钢 The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratios of pig iron: C 3.3wt%, Si 0.30 wt%, Mn 0.32wt%, P 0.058wt%, S 0.018wt%, the rest is Fe and unavoidable impurity) into the LD converter; then press 980kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of medium-high manganese, high-phosphorus and low-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1300 ° C, molten iron compos...

Embodiment 2

[0039] A. Smelting and loading process: after the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, according to 4.5kg / t 钢 The amount, add conventional active lime to the converter; according to 82kg / t 钢 The proportion of steel scrap loaded into the 50-ton LD converter is added with the following mass ratio of steel scrap: C 0.23wt%, Si 0.42wt%, Mn 1.30wt%, P 0.040wt%, S 0.033wt%, the rest is Fe and unavoidable impurity; according to 50kg / t 钢The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratio of pig iron: C 3.5wt%, Si 0.40 wt%, Mn 0.43wt%, P 0.067wt%, S 0.022wt%, the rest is Fe and unavoidable impurity) into the LD converter; then press 965kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of medium-high manganese, high-phosphorus and low-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1320 ° C, molten i...

Embodiment 3

[0045] A. Smelting and loading process: after the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, at a rate of 5.0kg / t 钢 The amount, add conventional active lime to the converter; according to 70kg / t 钢 The proportion of scrap steel is loaded into the 50-ton LD converter with the following mass ratio of scrap steel: C 0.26wt%, Si 0.50wt%, Mn 1.40wt%, P 0.046wt%, S 0.039wt%, the rest is Fe and unavoidable impurity; according to 50kg / t 钢 The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratio of pig iron: C 3.6wt%, Si 0.50wt%, Mn 0.55wt%, P 0.075wt%, S 0.027wt%, the rest is Fe and unavoidable impurity) into the LD converter; then press 950kg / t 钢 The molten iron is loaded into the ratio, and the following temperature and mass ratio of medium-high manganese, high-phosphorus and low-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1330 ° C, molten iron c...

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Abstract

The invention discloses a converter smelting method for improving end molten steel remainder Mn with medium-high-Mn, high-P and low-Si molten iron (C4.20-4.60wt, Mn 0.90wt%-1.15wt%, Si 0.05-0.15wt%, P0.100-0.130wt% and S smaller than or equal to 0.040wt%). Integrated innovation is conducted on processes such as slag retention operation, continuous casting residual slag application, low-alkalinityslagging process, constant-pressure low lance position operation in the smelting process and tapping slag washing in the whole process, smelting reaction dynamics and thermodynamic conditions are optimized, the distribution concentration of MnO in slag in the smelting process is increased, better smelting slagging and dephosphorization effects are obtained under the conditions of little slag andlow-alkalinity slag systems, rephosphorization of molten steel in the later period of smelting and the tapping process is reduced to the greatest extent, the content (0.43wt%-0.55wt%) of end point molten steel residual Mn is significantly increased, the addition amount of Mn alloys in the deoxidation alloying process is reduced, the steelmaking alloy consumption and alloying cost are significantlyreduced, the economic indexes of the smelting technology is improved, and the market competitiveness of products is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and steelmaking technology, and in particular relates to a converter smelting method for increasing residual manganese in end-point molten steel with medium-high-manganese, high-phosphorus, and low-silicon molten iron. Background technique [0002] Manganese (Mn) element is a beneficial element in steel. Most of Mn in molten iron is oxidized during converter blowing, and a small amount of Mn (residual Mn) remains in molten steel at the end of smelting. The Mn content of molten steel at the end of converter smelting mainly comes from Mn in molten iron. During the blowing process, manganese oxidation and reduction reactions occur between the molten metal pool, slag and oxygen, and the residual Mn content in molten steel at the end of converter is affected by The influence of factors such as the amount of slag, the oxidation of molten steel and slag at the end of the converter, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/32C21C5/36C22C33/06C22C38/02C22C38/04
CPCC21C5/32C21C5/36C22C33/06C22C38/002C22C38/02C22C38/04Y02P10/20
Inventor 陈伟王炳海张卫强邹荣吴光耀欧阳晨曦李金柱漆鑫曹重陈大双赵卫东付仕孟汪世富
Owner WUKUN STEEL
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