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.

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

Example Embodiment

[0035] Example 1

[0036] 1) Use w ([S])= 0.030% molten iron and ordinary steel scrap as raw materials, using top-bottom combined blowing converter smelting, tapping volume 25t ~ 35t, adding 0.5kg / t of 99.9% purity aluminum cake for molten steel precipitation deoxidation; adding aluminum cake for deoxidation After the end, use ordinary recarburizers, ordinary ferrosilicon alloy, silicomanganese, high-carbon ferromanganese, and ferrochrome for preliminary alloying of molten steel; after alloying, before the end of molten steel tapping, add lime and refined slag each at 6.5kg / t.

[0037] Early refining 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 process of molten steel refining, the bottom blowing and stirring argon flow rate is 400 NL / min~600NL / min during the early heating stage, the bottom blowing and stirring argon gas flow rate is 200 NL / min~300NL / min when the temperature rises in the middle of refining, and the b...

Example Embodiment

[0043] Example 2

[0044] 1) Use w ([S])= 0.020% molten iron and ordinary steel scrap as raw materials, using top-bottom combined blowing converter smelting, tapping volume 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 completion, use common recarburizers, common ferrosilicon alloy, silicomanganese, high-carbon ferromanganese, and ferrochrome for preliminary alloying of molten steel; after alloying, before molten steel tapping, add 5.5kg / t of lime and refined slag each .

[0045] Early refining 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 process of molten steel refining, the bottom blowing and stirring argon flow rate is 300 NL / min~450NL / min in the early heating stage, the bottom blowing and stirring argon gas flow rate is 150 NL / min~250NL / min when the temperature rises in the middle of refining, and the bottom b...

Example Embodiment

[0051] Example 3

[0052] 1) Use w ([S])= 0.025% molten iron and ordinary steel scrap as raw materials, using top-bottom combined blowing converter smelting, tapping volume 35t-40t, adding 1.0kg / t aluminum cake with a purity of 99.9% for molten steel precipitation deoxidation; adding aluminum cake for deoxidation After the completion, use common recarburizers, common ferrosilicon alloy, silicomanganese, high-carbon ferromanganese, and ferrochrome for preliminary alloying of molten steel; after alloying, before molten steel tapping, add lime and refined slag each 5.0kg / t .

[0053] Early refining 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 process of molten steel refining, the bottom blowing and stirring argon flow rate is 450 NL / min~500NL / min during the early heating stage, the bottom blowing and stirring argon gas flow rate is 200 NL / min~300NL / min when the temperature rises in the middle of refining, and the bottom ...

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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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