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Smelting method of low-cost high-purity 60Si2Mn spring steel

A smelting method and spring steel technology, applied in the field of alloy steel smelting, can solve the problems of high production cost, low molten steel cleanliness, and many process routes, and achieve the effects of reducing production and manufacturing costs, ensuring molten steel purity, and simple production process

Pending Publication Date: 2020-08-04
JIANGSU LIHUAI IRON AND STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spring steel produced has a high total oxygen content (>9ppm), calcium-aluminum-silicon series or non-deformable calcium-aluminum inclusions in the steel, the average size of the inclusions is too large, and the cleanliness of molten steel is low, which affects the local spring. Fatigue performance in the area; these production control methods have many process routes, various deoxidation slagging systems, and the use of expensive special alloys, resulting in unstable production control, large fluctuations in final product quality, and high production costs

Method used

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  • Smelting method of low-cost high-purity 60Si2Mn spring steel
  • Smelting method of low-cost high-purity 60Si2Mn spring steel
  • Smelting method of low-cost high-purity 60Si2Mn spring steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) use w ([S])= 0.030% molten iron and ordinary steel scrap as raw materials, using top-bottom double-blown converter smelting, tapping volume 25t~35t, adding 0.5kg / t aluminum cake with a purity of 99.9% for molten steel precipitation deoxidation; adding aluminum cake for deoxidation After the end, use ordinary recarburizer, ordinary ferrosilicon alloy, silicon manganese, high carbon ferromanganese, ferrochrome alloy for preliminary alloying of molten steel; after alloying, before the end of tapping the molten steel, add 6.5kg / t.

[0037] Refining primary slag w (CaO) / w (SiO 2 )=5.5, w (Al 2 o 3 )= 25.3%; refined to the station w ([Al])=0.019%.

[0038]2) In the refining process of molten steel, the argon flow rate of bottom blowing and stirring is 400 NL / min to 600 NL / min when the temperature is raised in the early stage, the flow rate of argon gas is 200 NL / min to 300 NL / min when the temperature is raised in the middle stage of refining, and the flow of argo...

Embodiment 2

[0044] 1) use w ([S])= 0.020% molten iron and ordinary steel scrap as raw materials, using top-bottom double-blown converter smelting, tapping amount 25t~30t, adding 0.8kg / t aluminum cake with a purity of 99.9% for molten steel precipitation deoxidation; adding aluminum cake for deoxidation After the end, use ordinary carburizer, ordinary ferrosilicon alloy, silicon manganese, high carbon ferromanganese, and ferrochrome alloy for preliminary alloying of molten steel; after alloying, before the end of tapping the molten steel, add 5.5kg / t of lime and refining slag .

[0045] Refining primary slag w (CaO) / w (SiO 2 )=4.9, w (Al 2 o 3 )= 24.6%; refined to the station w ([Al])=0.029%.

[0046] 2) In the refining process of molten steel, the argon flow rate of bottom blowing and stirring is 300 NL / min to 450 NL / min when the temperature is raised in the early stage, and the flow rate of argon gas is 150 NL / min to 250 NL / min when the temperature is raised in the middle stage ...

Embodiment 3

[0052] 1) use w ([S])= 0.025% molten iron and ordinary steel scrap as raw materials, using top-bottom double-blown converter smelting, the steel output is 35t~40t, adding 1.0kg / t aluminum cake with a purity of 99.9% for precipitation deoxidation of molten steel; adding aluminum cake for deoxidation After the end, use ordinary recarburizers, ordinary ferrosilicon alloys, silicon manganese, high carbon ferromanganese, and ferrochrome alloys for preliminary alloying of molten steel; after alloying, before the end of tapping the molten steel, add 5.0kg / t of lime and refining slag .

[0053] Refining primary slag w (CaO) / w (SiO 2 )=4.2、 w (Al 2 o 3 )= 26.5%; refined to the station w ([Al])=0.035%.

[0054] 2) In the refining process of molten steel, the argon flow rate of bottom blowing and stirring is 450 NL / min to 500 NL / min when the temperature is raised in the early stage, and the flow rate of argon gas is 200 NL / min to 300 NL / min when the temperature is raised in the ...

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Abstract

The invention discloses a smelting method of low-cost high-purity 60Si2Mn spring steel. The method comprises the following process production steps of converter blowing adopting, LF ladle refining, RHvacuum treatment and casting by a curved spray continuous casting machine. In a converter tapping process, molten steel is subjected to aluminum strong deoxidation, recarburization, alloying and slagging, in a refining process, heating and composition fine-adjusting are conducted, staged bottom blowing stirring control, slag surface deoxidation and molten steel precipitation deoxidation are conducted, and the aluminum content is 0.030%-0.0.45% in a control process; the molten steel is subjected to vacuum treatment, and the molten steel is kept for 20-30min under the state of vacuum less thanor equal to 100pa; and the molten steel is left to stand soft blowing, and the curved spray continuous casting machine conducts protective casting. According to the method, through aluminum strong deoxidation of the molten steel at an initial stage, diffusion and precipitation deoxidation in a refining process, high aluminum content of the molten steel, high alkalinity refining slagging, and molten RH high vacuum circulation treatment, the high-purity 60Si2Mn spring steel can be obtained, and the production steps are few, a single precipitation deoxidation way is used, and the production costis low.

Description

technical field [0001] The invention belongs to the technical field of alloy steel smelting, relates to the smelting of spring steel in alloy steel, in particular to a method for smelting low-cost and high-purity 60Si2Mn spring steel. Background technique [0002] With the development of high-stress springs, spring steel will be used at a higher hardness level, and the impact of non-metallic inclusions on the fatigue properties of spring steel will be more prominent. And the higher the strength of the spring steel, the more sensitive the impact of non-metallic inclusions on the fatigue performance, so in the spring steel smelting process, the number and size of inclusions need to be strictly controlled. [0003] Many studies on the control process of spring steel inclusions have been carried out at home and abroad: [0004] The Chinese patent with the publication number CN 107747060 A provides a production method of high-strength and high-fatigue life spring steel. The meth...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/10C21C5/28C21C7/00C22C38/04C22C38/06C22C38/34C22C38/42C22C38/46C22C38/50
CPCC21C5/28C21C7/0006C21C7/0025C21C7/06C21C7/10C22C38/002C22C38/04C22C38/06C22C38/34C22C38/42C22C38/46C22C38/50Y02P10/20
Inventor 印传磊郑力宁翟万里肖波许正周吉光林鹏石可伟张洪才
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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