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Method for smelting steel round billet for automobile axle shaft sleeve by using converter process

A technology of automobile semi-shaft and converter, applied in Φ150mm-Φ200mm round billet, can solve the problems of high nitrogen content and high content, achieve high purity of molten steel, reduce inclusion content, end point composition and high temperature hit rate.

Inactive Publication Date: 2010-12-29
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of relatively high content of residual elements Cu, Cr, Ni and Mo in steel made by electric arc furnace smelting process, especially the relatively high content of nitrogen in steel, and provide a method for producing automobile semi-finished products by converter process. Method for Continuous Casting Round Billets of Steel for Axle Sleeves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Production process flow: blast furnace→top-bottom combined blowing converter→LF refining furnace→VD vacuum furnace→round billet continuous casting machine→turning cooling bed→inspection→storage.

[0041] (1) Furnace molten iron: Si=0.45%, P=0.070%, S=0.028%.

[0042] (2) Converter smelting:

[0043] Steel grade 45Mn2 is smelted, and the top-bottom double-blowing converter adopts low-pressure and large-flow oxygen lance for oxygen supply, and nitrogen / argon gas is blown at the bottom. The slagging in the early and middle stages removes P, and the slagging in the middle and later stages removes S. Steel [C] = 0.12%, [P] = 0.010%; slag blocking is used for tapping the converter, and the thickness of the slag is 40mm. Add 400kg of special synthetic slag into the ladle during tapping.

[0044] (3) LF refining process

[0045] Composition control: [C]=0.44%, [Si]=0.24%, [Mn]=1.58%, [P]=0.016%, [S]=0.005%; white slag refining time 21 minutes; LF refining treatment time 35 ...

Embodiment 2

[0055] Production process flow: blast furnace→top-bottom combined blowing converter→LF refining furnace→VD vacuum furnace→round billet continuous casting machine→turning cooling bed→inspection→storage.

[0056] (1) Furnace molten iron: Si=0.50%, P=0.075%, S=0.025%.

[0057] (2) Converter smelting

[0058] Steel type 45Mn2 is smelted, and the top-bottom combined blowing converter adopts low-pressure large-flow oxygen lance for oxygen supply, and argon gas is blown at the bottom, slagging and P removal in the early and middle stages, and S removal in the middle and late stages of slagging, and then high carbon drawing operation is adopted, and the steel is tapped[ C] = 0.15%, [P] = 0.008%; slag blocking is used for tapping the converter, and the thickness of the slag is 35mm. At the same time, 450kg of special synthetic slag is added to the ladle during tapping.

[0059] (3) LF refining

[0060] Composition control: [C]=0.45%, [Si]=0.26%, [Mn]=1.60%, [P]=0.018%, [S]=0.005%; w...

Embodiment 3

[0070] Production process flow: blast furnace→top-bottom combined blowing converter→LF refining furnace→VD vacuum furnace→round billet continuous casting machine→turning cooling bed→inspection→storage.

[0071] (1) Furnace molten iron: [Si]=0.55%, [P]=0.067%, [S]=0.026%.

[0072] (2) Converter smelting

[0073] Steel grade 45Mn2 is smelted, and the top-bottom double-blowing converter adopts low-pressure and large-flow oxygen lance for oxygen supply, and nitrogen / argon gas is blown at the bottom. The slagging in the early and middle stages removes P, and the slagging in the middle and later stages removes S. Steel [C] = 0.16%, [P] = 0.011%; slag blocking is used for tapping the converter, and the thickness of the slag is 35mm. At the same time, 300kg of special synthetic slag is added to the ladle during tapping.

[0074] (3) LF refining

[0075] Composition control: [C]=0.45%, [Si]=0.26%, [Mn]=1.61%, [P]=0.017%, [S]=0.008%; white slag refining time 18 minutes; LF refining t...

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Abstract

The invention discloses a method for smelting a steel round billet for an automobile axle shaft sleeve by using a converter process, which belongs to the technical field of iron and steel smelting processes. The conventional production process of a seamless steel pipe round billet for the automobile axle shaft sleeve comprises an electric arc furnace, ladle refining and continuous casting. By studying steel using characteristics, the invention develops a process of blast furnace iron-making, converter steelmaking, LF ladle refining, VD vacuum refining and round billet continuous casting. The method comprises the following process steps of: putting blast furnace molten iron into a top-bottom combined blown converter for blowing; adopting an LF refining furnace and a VD vacuum furnace for refining after tapping; casting the molten iron into a round billet of Phi150 mm to Phi200 mm by using a round billet continuous caster; and finally, processing the round billet through a turn over cooling bed, and detecting and warehousing the round billet. The method has the advantages that: the residual elements in steel reach an average level of SigmaCu+Cr+Ni+Mo=0.051%; the gas content, in particular to the nitrogen gas content is less, the N in the steel is less than or equal to 40 ppm; a quick process rhythm and a high efficiency are realized; the purity of molten steel is improved; the harmless caused by the trace residual elements is lightened; and the performance of the steel for the automobile axle shaft sleeve is improved.

Description

technical background [0001] The invention belongs to the technical field of iron and steel smelting technology, in particular to a method for producing steel continuous casting round blanks for automobile axle shaft casings by means of a converter process. Background technique [0002] The seamless steel pipe for automobile half shaft casing is a hot-rolled seamless steel pipe of high-quality carbon structural steel and alloy structural steel for the manufacture of automobile half shaft casing and axle tube of drive axle housing. [0003] The automobile half-axle sleeve is assembled on the axle of the automobile to bear all the weight, impact force and transmission torque of the car body and vehicle, and to ensure the free rotation of the axle in the axle sleeve. The production process of this product includes multiple processes such as drawing, machining, heat treatment, and gear hobbing. [0004] The materials of the steel for the automobile half shaft casing mainly inclu...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C33/04C21C5/35C21C7/072C21C7/10B22D11/00
Inventor 李树庆王永然罗卓钟国庆王兰香
Owner TIANJIN IRON & STEEL GRP
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