Unlock instant, AI-driven research and patent intelligence for your innovation.

Deoxidation Process for Obtaining Fine Grain 20cr Steel

A fine-grain and process technology, applied in the field of deoxidation process to obtain fine-grain 20Cr steel, can solve the problems of steel performance deterioration, increase the consumption of aluminum and recarburizer, and increase smelting costs, etc., to achieve increased grain size, The effect of improving the purity of steel and good economic benefits

Active Publication Date: 2015-08-19
武汉钢铁有限公司
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The smelting process of converter and electric furnace is an oxidation reaction, mainly carbon-oxygen reaction. By blowing oxygen into the molten pool, the purpose of removing high-quality elements, reducing carbon content and raising the temperature of molten steel is easily caused. Advanced problems, causing pressure on subsequent deoxidation and alloying
In order to solve this problem, the traditional process often uses a large amount of aluminum deoxidation and adding recarburizers, but this will not only increase the consumption of aluminum and recarburizers, but also excessive aluminum deoxidation products with high melting points will easily lead to poor continuous casting and steel problems such as reduced quality and purity, increased smelting costs and deteriorated steel properties

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Deoxidation Process for Obtaining Fine Grain 20cr Steel
  • Deoxidation Process for Obtaining Fine Grain 20cr Steel
  • Deoxidation Process for Obtaining Fine Grain 20cr Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A. Carry out conventional hot metal desulfurization and converter or electric furnace smelting according to the composition requirements of 20Cr steel. Converter tapping control endpoint C is 0.08%, and the tapping amount reaches 22% of the total tapping amount, adding aluminum block at 0.6kg / ton steel for pre-deoxidation;

[0023] B. Send the molten steel in step A to the argon station, blow argon for 2 minutes and then feed it into the aluminum wire at a rate of 1.3m / ton, and continue blowing argon and stirring for 3 minutes;

[0024] Aluminum wire specifications: diameter 10mm, weight 205g / m, containing 99.75% Al, 0.05% Mg, the rest is Fe and other unavoidable impurities.

[0025] C. Send the molten steel in step B to the LF furnace for conventional refining. After melting the slag, add an appropriate amount of Al pellets and SiC powder to deoxidize the slag surface, and control the Als in the molten steel to 0.02%.

[0026] D. The molten steel in step C is sent to ...

Embodiment 2

[0028] A. Carry out conventional hot metal desulfurization and converter or electric furnace smelting according to the composition requirements of 20Cr steel. Converter tapping control endpoint C is 0.10%, and the tapping amount reaches 26% of the total tapping amount, adding aluminum block at 0.8kg / ton steel for pre-deoxidation;

[0029] B. Send the molten steel in step A to the argon station, blow argon for 5 minutes and then feed it into the aluminum wire at a rate of 1.25m / ton, and continue blowing argon and stirring for 6 minutes;

[0030] Aluminum wire specifications: diameter 10mm, weight 205g / m, containing 99.75% Al, 0.05% Mg, the rest is Fe and other unavoidable impurities.

[0031] C. Send the molten steel in step B to the LF furnace for conventional refining. After melting the slag, add an appropriate amount of Al pellets and SiC powder to deoxidize the slag surface, and control the Als in the molten steel to 0.03%.

[0032] D. The molten steel in step C is sent to...

Embodiment 3

[0034] A. Carry out conventional hot metal desulfurization and converter or electric furnace smelting according to the composition requirements of 20Cr steel. Converter tapping control endpoint C is 0.12%, and the tapping amount reaches 25% of the total tapping amount, adding aluminum block at 0.7kg / ton steel for pre-deoxidation;

[0035] B. Send the molten steel in step A to the argon station, blow argon for 3 minutes and then feed it into the aluminum wire at a rate of 1.25m / ton, and continue blowing argon and stirring for 5 minutes;

[0036] Aluminum wire specifications: diameter 10mm, weight 205g / m, containing 99.75% Al, 0.05% Mg, the rest is Fe and other unavoidable impurities.

[0037] C. Send the molten steel in step B to the LF furnace for conventional refining. After melting the slag, add an appropriate amount of Al pellets and SiC powder to deoxidize the slag surface, and control the Als in the molten steel to 0.04%.

[0038] D. The molten steel in step C is sent to...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a deoxidation technology for obtaining fine grain 20Cr steel. The technology comprises the following steps: (1) desulphurizing and smelting molten iron; (2) conveying the preliminary deoxidized molten steel in the step (1) to an argon station to refine; (3) LF refining; (4) continuously casting a square billet. Over-high oxygen and aluminum contents of molten steel are avoided by controlling the carbon content of the terminal point of a converter and synergetically adopting proper aluminum to deoxidize, proper AIN particles are generated from 20Cr steel, and the growth tendency of the grains in the heating process is hindered by the AIN particles with high melting points, so as to improve the purity and the grain size of the steel. The deoxidation technology does not need extra investment, can be carried out on the existing equipment, and is low in investment and operation costs, consumption of oxygen and aluminum in the smelting process can be effectively reduced, and the deoxidation technology has good economic benefits. Thus, the substantial fine grain 20Cr steel can be produced at low cost and large scale.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a deoxidation process for obtaining fine-grained 20Cr steel. Background technique [0002] 20Cr steel is the most typical basic variety of chromium-based alloy structural steel. It has a huge market demand and is widely used in the manufacturing industries such as automobiles and mining machinery. Or carburized parts with complex shapes and small loads, such as gears, gear shafts, cams, piston pins, worms, etc.; used for parts that require heat treatment with small deformation and high wear resistance, and can be subjected to high-frequency surface quenching after carburizing ; It can also be used as quenched and tempered parts with high working speed and medium impact load, which plays an important role in my country's national economy and national defense construction. [0003] With the development of social economy, users have higher and higher requirements on the performan...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06
Inventor 张帆范植金吴杰徐志周新龙丁礼权罗国华王瑞敏胡俊
Owner 武汉钢铁有限公司