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A kind of steel for automobile shock-absorbing piston rod and production method thereof

A shock-absorbing piston and production method technology, applied in the field of iron and steel smelting, can solve the problems of unfavorable product surface quality and use effect, and do not involve steel composition requirements, so as to reduce the risk of flocculation, realize grain refinement, and ensure surface quality effect

Active Publication Date: 2018-10-23
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Patent No. 201410173691.5 discloses "a boron-containing piston rod steel and its production method"; patent No. 201410335277 .X discloses "a free-cutting low-alloy piston rod steel and its production method ", but the steel types involved in the two patents contain a certain amount of B components to improve machinability, but high B content will cause the formation of "B phase" in the steel structure, which is detrimental to the surface quality and use effect of subsequent products
[0010] The patent document with the patent number 201410173691.5 discloses "a production process of piston rod wire rod for automobiles", but the patent only includes the rolling process and does not involve the steel composition requirements, which is different from the innovation point of this patent

Method used

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  • A kind of steel for automobile shock-absorbing piston rod and production method thereof
  • A kind of steel for automobile shock-absorbing piston rod and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The chemical composition and mass percentage of steel for shock absorbing piston rods for automobiles are as follows: C: 0.36%, Si: 0.22%, Mn: 0.69%, P: 0.020%, S: 0.029%, Al: 0.038%, and the balance For Fe and unavoidable impurities.

[0036] The production method of steel for damping piston rods for automobiles includes: converter smelting-LF furnace refining-RH furnace refining-continuous casting-billet opening-heating furnace treatment-rolling-cooling process, the specific steps are as follows:

[0037] (1) Converter smelting process: The blast furnace molten iron is mixed into the converter for smelting, the end point components and their mass percentages are: C: 0.08%, S: 0.025%, P: 0.018%.

[0038] (2) Refining process of LF furnace: Converter smelting molten steel enters LF furnace and heats up to 1588°C, deoxidizes white slag, the color of top slag is off-white; at the same time fine-tunes C and Mn alloys, SiO in slag 2 : 4.2%, the slag Mannesmann index MI is ...

Embodiment 2

[0047] The chemical composition and mass percentage of steel for shock absorbing piston rods for automobiles are as follows: C: 0.34%, Si: 0.22%, Mn: 0.69%, P: 0.021%, S: 0.028%, Al: 0.033%, and the balance For Fe and unavoidable impurities.

[0048] The production method of steel for damping piston rods for automobiles includes: converter smelting-LF furnace refining-RH furnace refining-continuous casting-billet opening-heating furnace treatment-rolling-cooling process, the specific steps are as follows:

[0049] (1) Converter smelting process: The blast furnace molten iron is mixed into the converter for smelting, the end point components and their mass percentages are: C: 0.09%, S: 0.22%, P: 0.019%.

[0050] (2) Refining process of LF furnace: Converter smelting molten steel enters LF furnace and heats up to 1585°C, deoxidizes white slag, and the color of top slag is white; fine-tuning C and Mn alloys at the same time, SiO in slag 2 : 4.5%, the slag Mannesmann index MI is ...

Embodiment 3

[0059] The chemical composition and mass percentage of steel for shock absorbing piston rods for automobiles are as follows: C: 0.35%, Si: 0.23%, Mn: 0.70%, P: 0.18%, S: 0.028%, Al: 0.029%, and the balance For Fe and unavoidable impurities.

[0060] The production method of steel for damping piston rods for automobiles includes: converter smelting-LF furnace refining-RH furnace refining-continuous casting-billet opening-heating furnace treatment-rolling-cooling process, the specific steps are as follows:

[0061] (1) Converter smelting process: The blast furnace molten iron is mixed into the converter for smelting. The end point components and their mass percentages are: C: 0.07%, S: 0.021%, P: 0.017%.

[0062] (2) Refining process of LF furnace: Converter smelting molten steel enters LF furnace and heats up to 1586°C for deoxidation of white slag, the color of top slag is off-white; at the same time fine-tuning C and Mn alloys, SiO in slag 2 : 4.6%, the slag Mannesmann index...

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Abstract

The invention discloses steel for a damping piston rod for an automobile and a production method of the steel. The steel for the piston rod comprises, by mass percent, 0.34%-0.36% of C, 0.19%-0.24% of Si, 0.67%-0.73% of Mn, not larger than 0.030% of P, 0.025%-0.030% of S, 0.020%-0.040% of Al and the balance Fe and inevitable impurities. The production method comprises the procedures of converter smelting, LF furnace refining, RH furnace refining, continuous casting, cogging, heating furnace treatment, rolling and cooling. According to the produced steel for the damping piston rod, the tensile strength is larger than or equal to 530 MPa, the percentage elongation after fracture is larger than or equal to 20%, the grain size is larger than or equal to the sixth stage, total oxygen in the steel is smaller than or equal to 0.002%, a decarburized layer is smaller than or equal to 1.0%D, and the requirement of the steel for the damper piston rod for the automobile can be effectively met.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to steel for a damping piston rod used in automobiles and a production method thereof. Background technique [0002] The shock absorber for automobiles is actually a vibration damper, and the piston rod is mainly used to support the connecting part of the shock absorber piston. It is a moving part with frequent movements and high technical requirements. As the core component, the processing quality of the piston rod is good. Damage directly affects the life and reliability of the entire shock absorber product. Shock absorber piston rod has high processing requirements, its surface roughness requirement is Ra: 0.4~0.8um, and it has strict requirements on coaxiality and wear resistance. machinability. [0003] Therefore, the shock absorber piston rod for automobiles also has strict requirements on the raw material steel. First, the steel material is requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C33/04C21C7/06C21C7/10C21D8/06
CPCC21C7/06C21C7/10C21D8/065C22C33/04C22C38/02C22C38/04C22C38/06
Inventor 戴永刚刘宏伟田新中张治广姬旦旦李世琳宋云霞李宝秀李永超王玲霞刘会杰焦克强翟进坡王成杰
Owner XINGTAI IRON & STEEL
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