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Smelting method capable of reducing inclusions of spring steel

A smelting method and spring steel technology, applied in the field of spring steel production, can solve the problems of reducing production costs, and achieve the effects of reducing production costs, reducing content, and easy polymerization and growth

Active Publication Date: 2016-12-07
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

[0006] The technical problem to be solved by the present invention is to provide a smelting method for reducing inclusions in spring steel in view of the deficiencies in the prior art above, to control the level of non-metallic inclusions in spring steel, and to solve the problem of changing the judgment due to excessive inclusions, greatly improving Reduced production costs

Method used

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  • Smelting method capable of reducing inclusions of spring steel
  • Smelting method capable of reducing inclusions of spring steel
  • Smelting method capable of reducing inclusions of spring steel

Examples

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Embodiment 1

[0024] A smelting method for reducing inclusions in spring steel, comprising the following steps: 1) smelting by high-drawing carbon technology, 2) argon blowing treatment, 3) LF furnace refining, 4) vacuum treatment, 5) LF soft blowing 6) rolling spring steel;

[0025] 1) Smelting with high-drawing carbon technology: using high-drawing carbon technology, the end point C is controlled at 0.12%, to prevent overoxidation of molten steel, and the dissolved oxygen α[O] in the steel is 287×10 -6 ;Bottom blowing and stirring at the end of smelting promotes the balance of steel and slag, and maintains continuous blowing of argon during the tapping process. The final slag basicity control target is R=3.0; the slag blocking plate is used to block slag tapping, and the tapping temperature is controlled at 1662°C. The amount of slag lowered is 39mm; alloying outside the furnace is adopted. During the tapping process, 17.6kg of high-purity ferrosilicon, 6.5kg of metal Mn, 11kg of high C-C...

Embodiment 2

[0033]A smelting method for reducing inclusions in spring steel, comprising the following steps: 1) smelting by high-drawing carbon technology, 2) argon blowing treatment, 3) LF furnace refining, 4) vacuum treatment, 5) LF soft blowing 6) rolling spring steel;

[0034] 1) Smelting with high-drawing carbon technology: using high-drawing carbon technology, the end point C is controlled at 0.10%, to prevent overoxidation of molten steel, and the dissolved oxygen α[O] in the steel is 347×10 -6 ;Bottom blowing and agitation at the end of smelting promotes the balance of steel and slag, and maintains continuous argon blowing during the tapping process. The final slag basicity control target is R=2.8; the slag blocking plate is used to block slag tapping, and the tapping temperature is controlled at 1669°C. The amount of slag lowered is 48mm; alloying outside the furnace is adopted. During the tapping process, 16.3kg of high-purity ferrosilicon, 6.6kg of metal Mn, 11.8kg of high C-Cr...

Embodiment 3

[0042] A smelting method for reducing inclusions in spring steel, comprising the following steps: 1) smelting by high-drawing carbon technology, 2) argon blowing treatment, 3) LF furnace refining, 4) vacuum treatment, 5) LF soft blowing 6) rolling spring steel;

[0043] 1) Smelting with high-drawing carbon technology: using high-drawing carbon technology, the end point C is controlled at 0.15%, to prevent overoxidation of molten steel, and the dissolved oxygen α[O] in the steel is 209×10 -6 ;Bottom blowing and stirring at the end of smelting promotes the balance of steel and slag, and maintains continuous blowing of argon during the tapping process. The final slag basicity control target is R=3.2; the slag blocking plate is used to block slag tapping, and the tapping temperature is controlled at 1652°C. The amount of slag lowered is 47mm; alloying outside the furnace is adopted. During the tapping process, 17.6kg of high-purity ferrosilicon, 7kg of metal Mn, 11.6kg of high C-C...

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Abstract

The invention discloses a smelting method capable of reducing inclusions of spring steel. The smelting method includes the following steps of (1) smelting through a high carbon withdrawing process; (2) argon blowing; (3) refining in an LF furnace; (4) vacuum treatment; (5) LF soft blowing; and (6) spring steel rolling. Especially, aluminum-free deoxidation is adopted during smelting through the high carbon withdrawing process, and a low-alkalinity slag process is adopted during refining in the LF furnace. According to the smelting method capable of reducing inclusions of spring steel, on the basis of researching thermodynamics and kinetics for separation out of inclusions, the content of oxides is lowered by controlling the deoxidation depth during smelting, the low-alkalinity slag process facilitates plasticization of inclusions, the plasticized inclusions can easily aggregate and grow up, flotation removal is facilitated during soft blowing in secondary refining, and therefore the purpose of controlling the level of nonmetal inclusions of spring steel is achieved; and the problem of judgment amending caused by exceeding of inclusions is completely solved, and the production cost is greatly lowered.

Description

technical field [0001] The invention belongs to the technical field of spring steel production, and is particularly suitable for a smelting method for reducing inclusions in spring steel. Background technique [0002] As a key material required for major equipment manufacturing and national key project construction, spring steel is widely used in aircraft, automobiles, railway vehicles and other transportation tools and construction machinery and other equipment. Springs and other spring materials with similar functions are used under high stress conditions, so they have high requirements for steel quality. Non-metallic inclusions in steel destroy the continuity of the matrix, which is the main cause of early fatigue and fracture of springs. One of the reasons, improving the fatigue performance has become one of the key research points of spring steel. [0003] Patent CN104056871B provides a spring steel wire production process for controlling inclusions. By controlling the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/16C22C38/08C22C33/06C21C7/06C21C7/10C21C7/072
CPCC21C7/0006C21C7/0087C21C7/06C21C7/072C21C7/10C22C33/06C22C38/02C22C38/04C22C38/08C22C38/16C22C38/18
Inventor 徐志东任安超张贤忠邱俊李媛吴杰桂江兵张帆夏艳花
Owner 武汉钢铁有限公司
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