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Production technology of spring steel 60Si2Mn hot-rolled wire rod for automotive suspension

A production process and technology for hot-rolled wire rod, which is applied in the field of production process of spring steel 60Si2Mn hot-rolled wire rod for automobile suspension, can solve the problems of high heating temperature, long heating time, increase production cost, etc., and achieve uniform chemical elements. , Optimize the rolling speed and ensure the effect of the time in the furnace

Active Publication Date: 2018-12-18
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method solves the problem of surface decarburization, the overall heating time is longer and the heating temperature is higher, which increases the production cost

Method used

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  • Production technology of spring steel 60Si2Mn hot-rolled wire rod for automotive suspension
  • Production technology of spring steel 60Si2Mn hot-rolled wire rod for automotive suspension
  • Production technology of spring steel 60Si2Mn hot-rolled wire rod for automotive suspension

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Experimental program
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Effect test

Embodiment 1

[0026]The production process of spring steel 60Si2Mn hot-rolled wire rod for automobile suspension in this embodiment includes molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, billet opening, billet grinding, and wire rod rolling processes. The specific process The steps are described below:

[0027] (1) Hot metal pretreatment process: after hot metal pretreatment, S: 350ppm;

[0028] (2) Converter smelting process: the ratio of scrap steel in the converter is controlled at 15%; when tapping the steel, the infrared slide plate + slag-stopping cone is used to strictly control the slag, and 12.0kg / t steel SiMn and 17.0kg / t steel SiMn are added during the tapping process Ferrosilicon precipitation deoxidation and alloying, adding synthetic refining slag 3.0kg / t steel along the steel flow when 1 / 2 of the steel is tapped;

[0029] (3) LF refining process: use aluminum-free deoxidation, add 1.1kg / t steel SiC diffusion deoxidation, ...

Embodiment 2

[0039] The production process of spring steel 60Si2Mn hot-rolled wire rod for automobile suspension in this embodiment includes molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, billet opening, billet grinding, and wire rod rolling processes. The specific process The steps are described below:

[0040] (1) Hot metal pretreatment process: after hot metal pretreatment, S: 320ppm;

[0041] (2) Converter smelting process: the ratio of scrap steel in the converter is controlled at 19%; when tapping the steel, the infrared slide plate + slag-stopping cone are used to strictly control the slag, and 13.0kg / t steel SiMn and 18.0kg / t steel SiMn are added during the tapping process Ferrosilicon precipitation deoxidation and alloying, adding synthetic refining slag 3.0kg / t steel along the steel flow when 1 / 2 of the steel is tapped;

[0042] (3) LF refining process: use aluminum-free deoxidation, add 1.1kg / t steel SiC diffusion deoxidation...

Embodiment 3

[0051] The production process of spring steel 60Si2Mn hot-rolled wire rod for automobile suspension in this embodiment includes molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, billet opening, billet grinding, and wire rod rolling processes. The specific process The steps are described below:

[0052] (1) Hot metal pretreatment process: after hot metal pretreatment, S: 350ppm;

[0053] (2) Converter smelting process: The scrap ratio of the converter is 13%; when tapping the steel, the infrared slide plate + slag-stopping cone double block is used to strictly control the slag, and 10.0kg / t steel SiMn and 15.0kg / t steel silicon are added during the tapping process Iron precipitation deoxidation and alloying, adding synthetic refining slag 3.5kg / t steel along the steel flow when 1 / 2 of the steel is tapped;

[0054] (3) LF refining process: use aluminum-free deoxidation, add 1.1kg / t steel SiC diffusion deoxidation, add 5.2kg / t st...

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Abstract

The invention discloses a production technology of a spring steel 60Si2Mn hot-rolled wire rod for an automotive suspension. The production technology comprises the steps of a hot metal pretreatment working procedure, a converter smelting working procedure, an LF refining working procedure, an RH vacuum treatment working procedure, a continuous casting working procedure, a cogging working procedure, an ingot blank polishing working procedure and a wire rod rolling working procedure. According to the production technology, the generation of AL2O3 inclusion is controlled from the source by meansof hot metal pretreatment desulfurization, silicon iron deoxygenation, silicon carbide diffusion deoxygenation and wollastonite and active lime slag formation; by the adoption of special carburant andspecial silicon iron, the content of nitrogen and the content of titanium in steel are controlled, argon protection in the whole process and the sufficient standing time are adopted, the situation that the inclusion fully and upwards floats is guaranteed, and D and Ds inclusion in the molten steel is controlled; by means of large ladle slag detection and special covering slag, the phenomenon thatthe molten steel is subjected to secondary pollution can be completely eradicated, and a good effect of thermal-insulating adsorption of the inclusion can be achieved; by means of the stir and soft press operation of a large rectangular blank crystallizer, the internal quality of an ingot blank is ensured; and in the rolling process, due to the optimization of the rolling speed and the control over the rolling temperature, the structure and the performance of a finished product are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of production of special hot-rolled wire rods, and in particular relates to a production process of spring steel 60Si2Mn hot-rolled wire rods for automobile suspension. Background technique [0002] 60Si2Mn is the most widely used spring steel grade with the largest output in China. It is mainly used in the transportation industry for shock absorbing springs of automobiles and tractors. The spring is subjected to alternating stress for a long time, so fatigue fracture is the main form of failure. Because springs have very high requirements on fatigue life and reliability, the physical quality requirements of spring steel wire rods are very strict. Decarburization on the surface of spring steel will seriously damage the fatigue performance of the spring, and the fatigue strength will decrease with the decrease of the carbon content on the surface. If the full decarburization of ferrite occurs on the surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/34C22C38/42C22C38/06C21D8/06C21C7/00C21C7/06C21C7/10
CPCC21C7/0006C21C7/0025C21C7/0068C21C7/06C21C7/10C21D8/065C22C38/002C22C38/02C22C38/04C22C38/06C22C38/34C22C38/42Y02P10/20
Inventor 许斌郝志超徐斌肖国华赵江孙俊喜申文军李国涛
Owner HANDAN IRON & STEEL GROUP
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