High strength spring steel and production method thereof

A production method and technology of spring steel, applied in the field of metallurgy, can solve problems such as complete fracture and insufficient strength

Active Publication Date: 2019-03-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coil springs are manufactured to have a lower thickness or fewer turns to respond to the requirements of light vehicles, however such coil springs result in insufficient strength after cutting, and coil springs with a small thickness have a tendency to quickly enter completely after undergoing partial fracture risk of breaking

Method used

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  • High strength spring steel and production method thereof
  • High strength spring steel and production method thereof
  • High strength spring steel and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] This embodiment provides a high-strength spring steel. The weight percentage of each chemical component of the high-strength spring steel is shown in Table 1, wherein the weight percentage of V is controlled to 0.16%.

[0054] In addition, this embodiment also provides the above-mentioned production method of high-strength spring steel. The high-strength spring steel is smelted in a 25kg vacuum induction furnace. The specific steps are as follows:

[0055] S1. Ingredients: According to the weight percentage of each chemical composition of the spring steel of Example 1 in Table 1, prepare raw materials required for smelting, including pure iron, metallic chromium, ferrovanadium, electrolytic manganese, industrial silicon, and graphite blocks.

[0056] S2. Smelting: Put the crucible containing pure iron and 80% graphite block in a 25kg vacuum induction furnace. The order of external silo charging is: industrial silicon, metallic chromium, graphite block, vanadium iron and electro...

Embodiment 2

[0061] This embodiment provides a high-strength spring steel. The weight percentage of each chemical component of the high-strength spring steel is shown in Table 1, wherein the weight percentage of V is controlled to 0.21%.

[0062] In addition, this embodiment also provides the above-mentioned production method of high-strength spring steel. The high-strength spring steel is smelted in a 25kg vacuum induction furnace. The specific steps are as follows:

[0063] S1. Ingredients: According to the weight percentages of the chemical components of the spring steel of Example 2 in Table 1, prepare raw materials required for smelting, including pure iron, metallic chromium, ferrovanadium, electrolytic manganese, industrial silicon, and graphite blocks.

[0064] S2. Smelting: Put the crucible containing pure iron and 80% graphite block in a 25kg vacuum induction furnace. The order of external silo charging is: industrial silicon, metallic chromium, graphite block, vanadium iron and electrol...

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Abstract

The invention discloses high strength spring steel and a production method thereof. The production method comprises the following steps: S1, preparing pure iron, metal chromium, ferrovanadium, manganese, industrial silicon and graphite according to components of a designed steel type: 0.51-0.65% of C, 1.20-1.60% of Si, 0.50-0.80% of Mn, 0-0.012% of P, 0-0.010% of S, 0.50-0.80% of Cr, 0-0.25% of Cuand 0.15-0.25% of V and the balance iron and inevitable impurities; S2, putting pure iron and part of graphite in a furnace to be vacuumized and heated and smelted, adding industrial silicon and metal chromium after the pure iron and graphite are fully melted, adjusting the melting temperature after the pure iron and graphite are fully melted, adding residual graphite to refine, vacuumizing the furnace at the same time, adding ferrovanadium and manganese after refining, and uniformly stirring the melted which is melted fully to obtain molten steel; S3, adjusting the temperature of the moltensteel and pouring the molten steel to a cast ingot; and S4, quenching the cast ingot, cooling the cast ingot to room temperature by oil, carrying out tempering treatment, air-cooling the cast ingot toroom temperature to obtain the high strength spring steel. The strength of the spring steel is improved greatly, and the toughness of the spring steel is considered.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a high-strength spring steel and a preparation method thereof. Background technique [0002] As the elastic element in the automobile suspension, the automobile suspension spring is mainly used as an elastic connection between the axle and the frame or the body, bearing and transmitting the vertical load, alleviating and restraining the impact caused by the uneven road, and its quality is good It plays a vital role in the stability and safety of the vehicle. Among them, cars and passenger cars have higher requirements on the performance of suspension springs, and need to meet the requirements of reducing noise, improving comfort and stability. [0003] The quenching temperature of high-strength spring steel is generally between 850°C and 900°C, and the tempering temperature is between 350°C and 500°C. The tempered structure is tempered troostite. After the tempering, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/20C22C38/24C22C38/34C22C33/06C21D1/18
CPCC21D1/18C22C33/06C22C38/002C22C38/02C22C38/04C22C38/20C22C38/24C22C38/34
Inventor 龚伟姜周华庞昇李涵李阳
Owner NORTHEASTERN UNIV
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