Full-process TMCP (thermal mechanical control processing) rolled 55SiCr spring steel and production method thereof

A production method and spring steel technology, applied in the field of full-process TMCP thermomechanical rolling of 55SiCr spring steel, can solve poor quality stability, unstable level of inclusion control in finished products, incomplete surface quality, component segregation and structure segregation of spring steel wire rods Solve and other problems to achieve good plastic toughness, improve durability and safety

Active Publication Date: 2018-09-21
埃斯科特钢有限公司 +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] Although my country's spring steel can reach the international advanced level at present, the localization rate of spring steel wire rods for suspension springs is about 90%; but the quality stability is poor, and there is still a certain gap with the international advanced level. The main reasons are as follows: from steelmaking In terms of equipment level, it is basically the same at home and abroad, but domestic steel mills have not fully

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  • Full-process TMCP (thermal mechanical control processing) rolled 55SiCr spring steel and production method thereof
  • Full-process TMCP (thermal mechanical control processing) rolled 55SiCr spring steel and production method thereof
  • Full-process TMCP (thermal mechanical control processing) rolled 55SiCr spring steel and production method thereof

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[0019] Example 1

[0020] A full-process TMCP hot-machine-rolled 55SiCr spring steel includes the following chemical composition in weight percentage: see Table 1 below, and the rest is Fe and unavoidable impurities.

[0021] A production method of 55SiCr spring steel rolled by a full-process TMCP heat machine: batching according to the above chemical composition ratio → electric furnace smelting → LF+RH vacuum refining → large round billet continuous casting → heating → blooming blooming → continuous rolling → rolling Billet making → flaw detection, grinding → high-speed wire heating furnace heating → controlled rolling and controlled cooling → reducing and sizing machine → laying machine → finished wire rod → packaging and warehousing. Specifically, electric arc furnace smelting→LF furnace refining→vacuum degassing→continuous casting of Φ380mm round billet→150mm×150mm square billet rolling→surface grinding→high-speed wire rod controlled rolling and controlled cooling. The rolling...

Example Embodiment

[0022] Example 2

[0023] A full-process TMCP hot-machine-rolled 55SiCr spring steel includes the following chemical composition in weight percentage: see Table 1 below, and the rest is Fe and unavoidable impurities.

[0024] A production method of 55SiCr spring steel rolled by a full-process TMCP heat machine: batching according to the above chemical composition ratio → electric furnace smelting → LF+RH vacuum refining → large round billet continuous casting → heating → blooming blooming → continuous rolling → rolling Billet making → flaw detection, grinding → high-speed wire heating furnace heating → controlled rolling and controlled cooling → reducing and sizing machine → laying machine → finished wire rod → packaging and warehousing. Specifically, electric arc furnace smelting→LF furnace refining→vacuum degassing→continuous casting Φ380mm round billet→150mm×150mm square billet rolling→surface grinding→high-speed wire rod controlled rolling and cooling, the rolling specification...

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Abstract

The invention provides full-process TMCP (thermal mechanical control processing) rolled 55SiCr spring steel and a production method thereof. The full-process TMCP rolled 55SiCr spring steel comprises0.52-0.58% of C, 1.20-1.60% of Si, 0.50-0.80% of Mn, 0.60-0.80% of Cr, less than or equal to 0.10% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.0020% of Ti, less than or equal to0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.010% of Alt, less than or equal to 10PPm of O, less than or equal to 1.0PPm of H and the balance Fe and inevitable impurities. Compared with the prior art, the full-process TMCP rolled 55SiCr spring steel and the production method have advantages that the surface of a finished product is free of a fully decarburized layer, thetotal decarburized layer depth is smaller than 0.10mm, a metallographic structure is formed by pearlite and a small quantity of ferrite, a surface ultrafine grain layer is avoided, grades of nonmetallic inclusions A, B, C, D and Ds are lower than or equal to 1.0, plasticity and toughness are better than those of common springs, and durability and safety in use are improved.

Description

technical field [0001] The invention belongs to the technical field of spring steel and its production technology, and in particular relates to a full-process TMCP thermomechanically rolled 55SiCr spring steel and a production method thereof. Background technique [0002] Springs are the most commonly used parts in the machinery industry and in daily life. In recent years, with the rapid development of the modern automobile industry and lightweight requirements, spring steel is moving towards high stress and high reliability. The spring market has shifted from price competition to technical quality competition, and the requirements for fatigue strength and anti-ballistic performance of springs are becoming more and more High, which puts forward very strict requirements on the stability of the spring steel production process, so the quality of the spring wire must be continuously improved. [0003] Although my country's spring steel can reach the international advanced level...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/50C22C38/34C22C38/20C22C38/28C22C38/18C21D8/06
Inventor 于同仁宋强张晓瑞孙山龚梦强姜婷尹德福王伟
Owner 埃斯科特钢有限公司
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