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A converter smelting method for increasing residual manganese in molten steel with high manganese and high silicon

A converter smelting and molten iron technology, which is used in the improvement of process efficiency and the manufacture of converters, etc., to reduce costs, improve product market competitiveness, and improve distribution concentration.

Active Publication Date: 2020-04-10
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≤0.60wt%, 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 high manganese high There is no relevant research report on the converter smelting method of ferrosilicon molten steel 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: pour out all the final slag in the converter after tapping the steel in the upper furnace and splashing the slag, according to 5.0kg / t 钢 The amount, add conventional active lime to the converter; according to 95kg / t 钢 The ratio of steel scrap is loaded into a 50-ton LD converter with the following mass ratios of steel scrap: C 0.12wt%, Si 0.12wt%, Mn 0.40wt%, P 0.020wt%, S 0.020wt%, 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 950kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of high-manganese and high-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1270 ° C, molten iron composition C4.40wt%, Mn1...

Embodiment 2

[0039] A. Smelting and loading process: pour out all the final slag in the converter after tapping the steel in the upper furnace and splashing the slag, according to 5.5kg / t 钢 The amount, add conventional active lime to the converter; according to 105kg / 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 0.16wt%, Si 0.20wt%, Mn 0.55wt%, P 0.029wt%, S 0.025wt%, the rest is Fe and unavoidable impurity; according to 45kg / t 钢 The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratio of pig iron: C3.4wt%, Si 0.40wt%, Mn 0.43wt%, P 0.067wt%, S 0.022wt%, the rest is Fe and unavoidable impurities) into the LD converter; then press 935kg / t钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of high-manganese and high-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1285 ° C, molten iron composition C4....

Embodiment 3

[0045] A. Smelting and loading process: pour out all the final slag in the converter after tapping the steel in the upper furnace and splashing the slag, according to 6.0kg / t 钢 The amount, add conventional active lime to the converter; according to 115kg / 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 0.20wt%, Si 0.30wt%, Mn 0.70wt%, P 0.038wt%, S 0.030wt%, the rest is Fe and unavoidable impurity; according to 40kg / t 钢 The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratio of pig iron: C3.6wt%, 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 920kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of high-manganese and high-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1300 ° C, molten iron composition C4....

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PUM

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Abstract

The invention discloses a converter smelting method for improving end-point molten steel residual manganese in high-manganese and high-silica molten iron (4.40 to 4.80 weight percent of C, 1.10 to 1.30 weight percent of Mn, 0.75 to 1.00 weight percent of Si, 0.085 to 0.105 weight percent of P and 0.015 to 0.035 weight percent of S). According to the method, by adopting technologies such as low alkalinity slag making technology, constant pressure gun change operation at gun position during smelting process, converter inverting gun pressing operation at minimum gun position, steel tapping whole-process wash heat process and carrying out integrated innovation, kinetic and thermodynamic conditions of smelting reaction are optimized, the distribution concentration of the slag (MnO) in the smelting process is improved and better smelting dephosphorizing effect is obtained under the conditions of less slag and a low basicity slag system; moreover, molten steel rephosphorization at the late smelting period and in the steel tapping process is reduced to the maximum extent, so that the residual Mn content (0.48 to 0.65 weight percent) of end-point molten steel is significantly increased, theadding amount of a manganese alloy during the deoxygenation alloying process is significantly reduced, the consumption of steelmaking alloys and the alloying cost are reduced, the improvement of smelting technical and economic indicators is promoted and further the market competitiveness of a product 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 molten steel with high manganese and high silicon. 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 the temperature at the end of the converter. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/32C21C7/064
CPCC21C5/32C21C7/064Y02P10/20
Inventor 陈伟王炳海邹荣吴光耀欧阳晨曦曹重李金柱陈大双文玉兵付仕孟柏承波唐海明白小强
Owner WUKUN STEEL
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