Spring steel wire production process used for controlling inclusion substances

A production process, spring steel technology, applied in the field of metallurgy, to achieve the effect of meeting the fatigue life requirements

Active Publication Date: 2014-09-24
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. "Inclusion Control of Spring Steel for Automobiles Produced by Converter Molding" introduces the process practice of producing automotive spring steel by converter injection molding, mainly designing a suitable special pickling and refining synthetic slag system, and does not involve specific processes
6. "MAEDE HIROFUMI.PRODUCTION OF SPRING STEEL WIRE ROD" (application number: JP05012148) discloses a production method of spring steel wire and rod with excellent fatigue properties, mainly for the analysis of oxide-type inclusions, No specific production process involved

Method used

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  • Spring steel wire production process used for controlling inclusion substances
  • Spring steel wire production process used for controlling inclusion substances
  • Spring steel wire production process used for controlling inclusion substances

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of spring steel wire rod production process for controlling inclusion, comprises the steps:

[0031] 1) Adopt the aluminum-free deoxidation process of Si / Mn smelting spring steel 55SiCr, avoid using aluminum in the smelting process, and reduce the Al and Al brought into by slag, lining, alloy, etc. 2 o 3 , to control the W in molten steel [Al] -6 、a [Ca] -9 ;

[0032] 2) Converter top-bottom combined blowing: use special ferrosilicon, control Als<0.0020% in the steel; add light-burned magnesium balls at 0.8kg per ton of steel; control carbon at 0.08wt% at tapping; control the basicity of the final slag at R= 2.5;

[0033] 3) Argon blowing treatment at Ar station: Bottom blowing argon treatment is adopted in the whole process, argon pressure control: 0.4MPa, argon flow rate: 7.0Nm 3 / min, to avoid secondary oxidation and gas absorption;

[0034] 4) Refining by argon blowing in LF ladle: the refining time is 45 minutes, and argon is blown throughout the refin...

Embodiment 2

[0047] A kind of spring steel wire rod production process for controlling inclusion, comprises the steps:

[0048] 1) Adopt the aluminum-free deoxidation process of Si / Mn smelting spring steel 55SiCr, avoid using aluminum in the smelting process, and reduce the Al and Al brought into by slag, lining, alloy, etc. 2 o 3 , to control the W in molten steel [Al] -6 、a [Ca] -9 ;

[0049] 2) Converter top-bottom combined blowing: use special ferrosilicon, control Als<0.0020% in the steel; lightly burnt magnesium balls are added at 1.1kg per ton of steel; tap carbon is controlled at 0.14%; final slag basicity is controlled at R=4.4 ;

[0050] 3) Argon blowing treatment at Ar station: argon pressure control: 0.5MPa, argon flow rate: 8.0Nm 3 / min, to avoid secondary oxidation and gas absorption;

[0051] 4) Refining by argon blowing in LF ladle: the refining time is 45 minutes, and argon is blown throughout the refining process. The argon blowing process follows three different st...

Embodiment 3

[0055] A kind of spring steel wire rod production process for controlling inclusion, comprises the steps:

[0056] 1) Adopt the aluminum-free deoxidation process of Si / Mn smelting spring steel 55SiCr, avoid using aluminum in the smelting process, and reduce the Al and Al brought into by slag, lining, alloy, etc. 2 o 3 , to control the W in molten steel [Al] -6 、a [Ca] -9 ;

[0057] 2) Converter top-bottom combined blowing: use special ferrosilicon, control Als<0.0020% in steel; add light-burned magnesium balls by 1.2kg per ton of steel; control target of tapping carbon 0.08%; control target of final slag basicity R=3.0 ;

[0058] 3) Argon blowing treatment at Ar station: argon pressure control: 0.6MPa, argon flow rate: 9.0Nm 3 / min, to avoid secondary oxidation and gas absorption;

[0059] 4) Refining by argon blowing in LF ladle: the refining time is 30 minutes, and argon is blown throughout the refining process. The argon blowing process follows three different stages ...

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Abstract

The invention relates to a spring steel wire production process used for controlling inclusion substances, and the process is mainly as follows: by use of a Si / Mn deoxidization smelting process, Al and Ca content in steel is controlled as far as possible, and MgO content in the inclusion substances is increased to obtain low melting point CaO.SiO2.Al2O3 series inclusions; in the smelting process, by the deoxidization control and secondary refining process, the target control range of the inclusion substances can be SiO2:40-70%, Al2O3:10-25% and CaO:20-50%; the content ratio of CaO to SiO2 is 0.2-1.0, and the size of most of the inclusion substances can be controlled at less than 5 mum. By plastic control of the inclusion substances, the drawing performance of spring steel can be improved, and the fatigue limit of the spring can be increased.

Description

technical field [0001] The invention relates to a spring steel wire production process for controlling inclusions, belonging to the technical field of metallurgy. Background technique [0002] The light weight and energy saving of vehicles put forward requirements on the weight of vehicle springs; the high speed and heavy load of railway passenger and freight cars greatly increase the working load of springs, which put forward higher requirements for the design stress of springs. Under high stress conditions, the microscopic inclusions become the source of fatigue cracks, which reduces the fatigue limit of the material and eventually leads to the fracture of the spring. The influence of inclusions in steel has become one of the most important reasons for spring failure. [0003] To improve the fatigue performance of springs, non-metallic inclusions in steel must be controlled. The brittle and non-deformable non-metallic inclusions in the steel are important reasons for the...

Claims

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Application Information

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IPC IPC(8): B21C37/04C22C38/42C21C7/06
Inventor 仇东丽罗德信吴超吴杰帅习元夏艳花鲁修宇黄静
Owner 武汉钢铁有限公司
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