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

Electric arc furnace smelting method of sulfur-containing free-cutting stainless steel

A smelting method and electric arc furnace technology, which is applied in the field of electric arc furnace smelting of sulfur-containing free-cutting stainless steel, can solve the problems of high production cost, low production efficiency, and difficulty in controlling S content, and achieve low production cost, high production efficiency, and low composition and stable performance

Inactive Publication Date: 2020-01-10
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an electric arc furnace smelting method for sulfur-containing free-cutting stainless steel in order to overcome the problems in the prior art that the S content is difficult to control, the production efficiency is low, and the production cost is high

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] (1) Furnace charge preparation: The charge is composed of duplex stainless steel return material, chrome-nickel stainless steel return material, Benxi steel return material, high-carbon chromium alloy, and Fe-Mo alloy. The charge weight is about 40 tons, and the content of Cr in the charge is controlled. is 15.5% by weight;

[0075] (2) Rough refining in electric arc furnace: carry out oxygen blowing decarburization with the furnace charge prepared in step (1), and control the temperature of molten steel to be 1580 ℃ and the content of carbon at the end point to be 0.4% by weight; then, relative to the temperature of molten steel Weight, add 0.75% by weight of lime, 0.3% by weight of Fe-Si alloy, 0.2% by weight of Si powder and 0.3% by weight of carbon powder are added after the slag is melted to carry out pre-reduction; then add 1.3% by weight relative to the weight of molten steel Lime by weight, refining slag of 0.5% by weight and fluorite of 0.2% by weight, the Al b...

Embodiment 2

[0079] (1) Furnace charge preparation: The charge is composed of duplex stainless steel return material, chrome-nickel stainless steel return material, Benxi steel return material, high-carbon chromium alloy, and Fe-Mo alloy. The charge weight is about 40 tons, and the content of Cr in the charge is controlled. is 16% by weight;

[0080] (2) Rough refining in electric arc furnace: carry out oxygen blowing decarburization with the charge prepared in step (1), and control the temperature of molten steel to be 1600 ℃ and the content of carbon at the end point to be 0.42% by weight; then, relative to the temperature of molten steel Weight, add 0.8% by weight of lime, and add 0.4% by weight of Fe-Si alloy, 0.3% by weight of Si powder and 0.35% by weight of carbon powder after the slag is melted for pre-reduction; then add 1.5% by weight relative to the weight of molten steel Lime by weight, refining slag of 0.3% by weight and fluorite of 0.4% by weight, 0.15% by weight of Al block,...

Embodiment 3

[0084] (1) Furnace charge preparation: The charge is composed of duplex stainless steel return material, chrome-nickel stainless steel return material, Benxi steel return material, high-carbon chromium alloy, and Fe-Mo alloy. The charge weight is about 40 tons, and the content of Cr in the charge is controlled. is 16.3% by weight;

[0085] (2) Rough refining in electric arc furnace: carry out oxygen blowing decarburization with the burden prepared in step (1), and control the temperature of molten steel to be 1640 ℃ and the content of carbon at the end point to be 0.5% by weight; then, relative to the temperature of molten steel Weight, add 1.2% by weight of lime, after the slag is melted, add 0.5% by weight of Fe-Si alloy, 0.4% by weight of Si powder and 0.4% by weight of carbon powder for pre-reduction; then add 1.8% by weight relative to the weight of molten steel Lime by weight, refining slag of 0.6% by weight and fluorite of 0.5% by weight, the Al block of 0.45% by weight...

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 relates to the field of ferrous metallurgy, in particular to an electric arc furnace smelting method of sulfur-containing free-cutting stainless steel. The electric arc furnace smeltingmethod comprises the following steps of (1) furnace burden preparation; (2) electric arc furnace crude smelting, specifically, conducting oxygen blowing decarbonization, prereduction, reduction, composition adjustment and sulfur-containing substance adding on furnace burden prepared in the step (1) in sequence; (3) VOD furnace refining, specifically, conducting oxygen blowing, vacuum carbon deoxygenation, reduction and composition adjustment on molten steel obtained through electric arc furnace crude smelting in sequence; and (4) casting. The electric arc furnace smelting method provided by the invention is low in production cost and high in production efficiency. The output can reach up to 40 tons. Moreover, the problem that the S content of sulfur-containing free-cutting stainless steelis hard to control in the prior art is solved. The material composition and performance of produced stainless steel are quite stable.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to an electric arc furnace smelting method for sulfur-containing free-cutting stainless steel. Background technique [0002] The steel types represented by DIN1.4104 (X14CrMoS17) and Y1Cr17Mo are chalcogenide free-cutting stainless steels. The structure at room temperature is martensite structure, which has good cutting performance and good thermoplasticity. The materials are widely used in machinery, chemical industry, aviation, etc. and aerospace industry. The chemical elements of this type of stainless steel are mainly characterized by low C, high Cr, and a small amount of Ni, Mo and S elements. However, while adding S improves the machining performance, it is more difficult to control the stability of S during the smelting process, which increases the risk of the formation of Type A inclusions in the steel and reduces the processing plasticity and corrosion resistance o...

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 Applications(China)
IPC IPC(8): C21C5/52C22C38/44C22C38/60C21C7/068C21C7/10
CPCC21C5/005C21C7/0685C21C7/10C22C38/44C22C38/60Y02P10/20
Inventor 张来明魏涛薛彦华李红杰
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL