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A production method of high cleanliness sulfur-containing aluminum-containing steel

A technology with high cleanliness and production methods, applied in the field of alloy steel, can solve the problems that it is difficult to ensure the secondary oxidation of molten steel with low oxygen content, the quality control level of molten steel smelting is low, and the requirements for product use cannot be met, so as to avoid contamination of molten steel Inhomogeneity and composition, reduce labor intensity, reduce the effect of production process cost

Active Publication Date: 2021-12-03
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cleanliness of this kind of sulfur-containing and aluminum-containing steel also has very high requirements, but most of the sulfur-containing and aluminum-containing steel products produced in China are still in the research of only satisfying the composition requirements and good castability of continuous casting , the quality control level of molten steel smelting is low, especially the cleanliness control of steel, which cannot meet the requirements of product use
[0003] For example, a method for controlling sulfur content in steel published by patent CN201510358287 and a method for smelting sulfur-containing steel published by patent CN201510158044, only about the production method of sulfur retention in molten steel of the electric furnace / converter-LF-(VD) process route, by adding silica Low-alkalinity slag is used to maintain the sulfur content of molten steel, and LF refining feeds sulfur lines and calcium lines, and LF leaves the station and removes slag. It is difficult to ensure low oxygen content in molten steel and avoid secondary oxidation of molten steel, and it is very easy to cause The generation of CaS in the steel blocks the nozzle during continuous casting, so that large-sized, large-particle oxide inclusions and slender sulfides appear in the final steel, making it difficult to ensure the cleanliness of molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 20CrMnTi, in steel w ([Al]) =0.020%~0.040%, w ([S])=0.020%~0.037%, w ([Si]) =0.20%~0.30%,. It specifically includes the following steps:

[0030] 1) Use high-sulfur molten iron, slag steel and sulfur-containing scrap steel as raw materials, and use top-bottom blowing converter for blowing, and the molten steel ends. w ([S])=0.035%~0.045%, when the converter taps 0t~10t, add 2.0kg / t~3.0kg / t ordinary ferrosilicon alloy for preliminary deoxidation. When the tapping progress is 60%~80%, 1.3kg / t~1.7kg / t aluminum block is added for deep deoxidation. At the end of tapping, 6.0kg / t~7.0kg / t lime and 2.5kg / t~3.0kg / t premelting refining slag are added. Refined to the station w ([Al]) =0.015%~0.020%.

[0031] 2) The LF refining process does not add lime, refining slag and other slag materials. Aluminum particles and high-purity silicon carbide are used for slag surface diffusion deoxidation and aluminum particle precipitation deoxidation. The amount of high-purity silicon ca...

Embodiment 2

[0037] F45MnVS, in steel w ([Al]) =0.010%~0.040%, w ([S])=0.035%~0.075%, w ([Si]) =0.30%~0.60%,. It specifically includes the following steps:

[0038] 1) Use high-sulfur molten iron, slag steel and sulfur-containing scrap steel as raw materials, and use top-bottom blowing converter for blowing, and the molten steel ends. w ([S])=0.035%~0.050%, when the converter taps 0t~10t, add 3.5kg / t~5.0kg / t common ferrosilicon alloy for preliminary deoxidation. When the tapping progress is 60%~80%, 0.9kg / t~1.5kg / t aluminum block is added for deep deoxidation. At the end of tapping, 6.0kg / t~7.0kg / t lime and 2.8kg / t~3.5kg / t premelting refining slag are added. Refined to the station w ([Al]) =0.010%~0.020%.

[0039] 2) The LF refining process does not add lime, refining slag and other slag materials. Aluminum particles and high-purity silicon carbide are used for slag surface diffusion deoxidation and aluminum particle precipitation deoxidation. The amount of high-purity silicon carbi...

Embodiment 3

[0045] 42CrMo-S, in steel w ([Al]) =0.020%~0.045%, w ([S])=0.015%~0.030%, w ([Si]) =0.17%~0.37%,. It specifically includes the following steps:

[0046] 1) Use high-sulfur molten iron, slag steel and sulfur-containing scrap steel as raw materials, and use top-bottom blowing converter for blowing, and the molten steel ends. w ([S])=0.030%~0.045%, when the converter taps 0t~10t, add 2.5kg / t~3.5kg / t common ferrosilicon alloy for preliminary deoxidation. When the tapping progress is 60%~80%, 1.1kg / t~1.6kg / t aluminum block is added for deep deoxidation. At the end of tapping, 6.0kg / t~7.0kg / t lime and 3.0kg / t~4.0kg / t premelting refining slag are added. Refined to the station w ([Al]) =0.020%~0.030%.

[0047] 2) The LF refining process does not add lime, refining slag and other slag materials. Aluminum particles and high-purity silicon carbide are used for slag surface diffusion deoxidation and aluminum particle precipitation deoxidation. The amount of high-purity silicon carb...

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Abstract

The invention discloses a production method of sulfur-containing and aluminum-containing steel with high cleanliness. The steps are: blowing in a converter by top-bottom blowing and re-blowing; performing compound deoxidation, alloying and slagging of molten steel in the tapping process; heating up in the LF refining process , slag surface diffusion deoxidation and molten steel precipitation deoxidation, do not deliberately desulfurize, control the argon flow rate of bottom blowing and stirring of the ladle throughout the refining process, perform calcium treatment and soft blowing on the molten steel before refining out of the station; transfer the molten steel to the RH station, according to the residual sulfur content of the molten steel Feed the sulfur wire to increase the target value of the sulfur value of the molten steel, then vacuum treatment, and then perform micro-calcium treatment and denaturation after the hollow; By increasing the original sulfur content of molten steel, desulphurization without additional slag in the refining process, only diffusion and precipitation deoxidation of molten steel, weak bottom blowing stirring and calcium treatment to promote the removal of inclusions, and sulfur feeding line before molten steel RH enters the station to ensure the circulation of molten steel RH Afterwards, there is no longer any composition adjustment, to prevent secondary pollution of molten steel, and to achieve high cleanliness control of molten steel.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, relates to the production of sulfur-containing aluminum-containing steel, and in particular relates to a production method of high-cleanliness sulfur-containing aluminum-containing steel. Background technique [0002] With the rapid development of my country's vehicle machinery industry, MnS inclusions in steel act as a source of stress concentration, cutting off the continuity of the matrix and making the cutting easy to break, as well as having a lubricating effect to reduce tool wear, thereby improving the cutting performance of steel. , More and more construction machinery steels choose to add a certain amount of sulfur to the steel. The cleanliness of this type of sulfur-containing aluminum-containing steel also has high requirements, but most of the domestic sulfur-containing aluminum-containing steel products still remain in the research on the process method that only meets the require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C7/06C21C7/072C21C7/10
CPCC21C5/35C21C7/0056C21C7/06C21C7/072C21C7/10Y02P10/20
Inventor 印传磊郑力宁翟万里张洪才石可伟林鹏左辉肖波田春阳许正周
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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