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Preparation method for carbon extraction and manganese consercation in medium-manganese high-phosphorus molten steel in converter steel making

A converter smelting and molten iron technology, which is applied in the manufacture of converters and the improvement of process efficiency, etc., can solve the problems of no relevant research reports on the carbon extraction and manganese preservation process, achieve good slagging and dephosphorization effects, and promote rapid slagging and slagging , the effect of reducing the amount added

Active Publication Date: 2019-01-08
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic steel mills basically adopt low-Mn and low-P molten iron with the following chemical composition (Mn≤0.50wt%, Si0.30-0.55wt%, P≤0.090wt%). There are certain research reports on the smelting process, but there is no relevant research report on the process of using medium manganese and high phosphorus molten iron to smelt carbon and preserve manganese

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The preparation method of the converter smelting medium manganese and high-phosphorus hot metal to extract carbon and preserve manganese includes the following process steps:

[0017] A. Smelting and charging process: After the slag splashing of the upper furnace steel is completed, 1 / 2 of the final slag is retained in the converter, and the pressure is 2.0-3.0kg / t steel Add conventional active lime to the converter; press 115-135kg / t steel The proportion of scrap steel is added to the 50-ton LD converter; the rate is 30kg / t steel The pig iron is charged into the proportion of the pig iron, and the pig iron is added to the 50-ton LD converter; after that, the pressure is 910-930kg / t steel The molten iron is charged into the 50 ton LD converter with high manganese and high phosphorus molten iron at the following temperature and mass ratio: molten iron temperature ≥ 1280 ℃, molten iron composition C4.0-5.0wt%, Mn0.70-0.90wt%, Si 0.25-0.45wt%, P 0.120-0.220wt%, S≤0.040wt%, ...

Embodiment 1

[0030] A preparation method for extracting carbon and preserving manganese from molten manganese and high-phosphorus molten iron in converter smelting includes the following process steps:

[0031] A. Smelting and charging process: After the slag splashing of the upper furnace steel is completed, 1 / 2 of the final slag is retained in the converter, and the rate is 2.0kg / t steel Add conventional active lime to the converter; press 115kg / t steel In the 50-ton LD converter, add the following mass ratios of scrap steel: C 0.22wt%, Si 0.40wt%, Mn 1.20wt%, P 0.025wt%, S 0.018wt%, the rest is Fe and unavoidable Impurity; press 30kg / t steel In the 50-ton LD converter, add the following mass ratios of pig iron: C3.2wt%, Si 0.30wt%, Mn 0.30wt%, P 0.070wt%, S 0.020wt%, the rest is Fe and unavoidable Impurity) into the LD converter; then press 930kg / t steel The molten iron is charged to the 50 ton LD converter with the following temperature and mass ratio of the medium manganese and high p...

Embodiment 2

[0037] A preparation method for extracting carbon and preserving manganese from molten manganese and high-phosphorus molten iron in converter smelting includes the following process steps:

[0038] A. Smelting and charging process: After the slag splashing of the upper furnace steel is finished, 1 / 2 of the final slag is retained in the converter at 2.5kg / t steel Add conventional active lime to the converter; press 125kg / t steel In the 50-ton LD converter, add the following mass ratios of scrap steel: C 0.24wt%, Si 0.49wt%, Mn 1.35wt%, P 0.032wt%, S 0.025wt%, the rest is Fe and unavoidable Impurity; press 30kg / t steel In the 50-ton LD converter, add the following mass ratios of pig iron: C 3.3wt%, Si 0.40wt%, Mn 0.40 wt%, P 0.080wt%, S 0.028wt%, the rest is Fe and unavoidable Impurity) into the LD converter; then press 920kg / t steel In the 50-ton LD converter, add the following temperature and mass ratio of the medium manganese and high phosphorus molten iron: molten iron tempe...

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PUM

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Abstract

The invention discloses a preparation method for carbon extraction and manganese consercation in medium-manganese high-phosphorus molten steel (Mn is 0.70-0.90wt%, Si is 0.25-0.45wt%, P is 0.120-0.220wt% and S is less than or equal to 0.040wt%) in converter steel making. By adopting the preparation method, processes such as slag retention operation, continuous casting slag application, little slagsmelting, constant pressure gun conversion operation in the smelting process, lowest gun position pressing operation in primary pouring of a converter, and slag wash of whole-process steel discharge,are integrated and created, rapid slag formation in the smelting process is promoted, smelting reaction kinetic and thermodynamic conditions are improved, excellent slagging and phosphorus removal effects are achieved, molten steel and slag splashing in the smelting process is avoided, a MnO allocation concentration is effectively increased, reduction of the MnO at the medium stage of smelting ispromoted, secondary oxidation of Mn in molten steel at the later smelting stage is reduced, furthermore, the content of residual Mn in the molten steel at a final point is remarkably increased (0.25-0.40wt%), the addition amount of a manganese alloy in a deoxidation alloying process is reduced, the steel making alloy consumption and alloying cost can be remarkably reduced, and the market competitiveness of products can be improved.

Description

Technical field [0001] The invention belongs to the technical field of steel metallurgy and steelmaking technology, and specifically relates to a preparation method for extracting carbon and preserving manganese from a converter smelting medium manganese and high-phosphorus hot metal. Background technique [0002] Manganese (Mn) is a beneficial element in steel. During the converter smelting process, as the converting process continues, most of the Mn in the molten iron is oxidized, and the residual Mn content in the molten steel at the end of smelting is low, resulting in deoxidation and alloying of Mn The cost of the series alloy is higher. The Mn content of the molten steel at the end of the converter smelting mainly comes from Mn in the molten iron. During the blowing process, oxidation and reduction of manganese occur between the metal bath, slag and oxygen, and the residual Mn content in the molten steel at the end of the converter is affected. The influence of factors suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/32C21C7/064C22C38/04
CPCC21C5/32C21C7/064C22C38/04Y02P10/20
Inventor 陈伟张卫强王炳海吴光耀杨春雷欧阳晨曦文玉兵曹重付士富陈大双王定树
Owner WUKUN STEEL
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