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Ultralow sulfur steel quick smelting method

A smelting method, ultra-low sulfur steel technology, applied in the field of metallurgy, can solve the problems of strict sulfur content requirements, smelting desulfurization process can not fully meet the needs of large-scale production, to meet production needs, ensure the pace of smelting production, and converter steel tapping The effect of deoxygenation stabilization

Active Publication Date: 2014-07-02
NANJING IRON & STEEL CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the development of science and technology, the society has higher and higher requirements for steel materials, especially the development of anti-HIC and H2S corrosion-resistant steel. The sulfur content in the steel is required to be within 0.0010%. The desulfurization process can no longer fully meet the needs of large-scale production

Method used

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  • Ultralow sulfur steel quick smelting method
  • Ultralow sulfur steel quick smelting method
  • Ultralow sulfur steel quick smelting method

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Embodiment 1

[0035] In this embodiment, the X80 pipeline steel grade is selected, and a 150-ton converter and a 150-ton ladle furnace are used for smelting according to the above-mentioned method. The chemical composition of its X80 pipeline steel is shown in Table 1.

[0036] Table 1X80 main chemical composition (%)

[0037]

[0038] The whole smelting process is controlled as follows:

[0039] (1) Converter blowing. The composition and temperature control at the end of blowing are shown in Table 2.

[0040] Table 2 Converter end point composition (%)

[0041]

[0042] (2) Deoxidation and slagging alloying after converter furnace. The order of adding auxiliary materials in the tapping process: start tapping→lime, refining slag→aluminum block, silicomanganese, manganese metal. See Table 3 for the addition amount and composition control after furnace.

[0043]Table 3 Composition after furnace

[0044]

[0045] (3) Refining deoxidation, slagging desulfurization, and removal of...

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Abstract

The invention discloses an ultralow sulfur steel quick smelting method. The difficult points of slagging, deoxidizing and desulfurating in the smelting process of the ultralow sulfur steel ([S] is not more than 0.0010%) are successfully solved. The method comprises the following steps: pretreating molten steel to desulfurate and remove slag, deeply deoxidizing tapping aluminum block through a converter, modifying composite refined top slag, deoxidizing aluminum wire through a LF refining furnace, slagging through lime and feeding aluminum wire to trimming aluminum molten steel, combining the whole reasonable argon bottom blowing control in the smelting process of the LF furnace, fully playing the metallurgical thermodynamics and thermodynamics and kinetics of desulfuration, organically combining the diffusion deoxidization and sediment deoxidization, sufficiently evacuating deoxidization and desulfuration potential of the slag so that the sulfur content in the molten steel within 40min can be reduced to within 0.0010% through the LF refining furnace and the full oxygen content of casting blank is controlled within 0.0010%. The sulfur content control of the molten steel is stable, the casting blank is good in quality, the steel plate flaw detection yield can achieve above 99%, the ultralow sulfur steel production requirement is completely satisfied, and the smelting production rhythm and the continuous casting pouring furnace are guaranteed.

Description

technical field [0001] The invention belongs to a steelmaking process in the field of metallurgy, and relates to a process for controlling the sulfur content of smelting ultra-low sulfur steel. Background technique [0002] Sulfur will have adverse effects on the performance of steel. High sulfur content in steel will deteriorate the hot working performance of steel, that is, cause the "hot brittleness" of steel. With the development of science and technology, the society has higher and higher requirements for steel materials, especially the development of anti-HIC and H2S corrosion-resistant steel. The sulfur content in the steel is required to be within 0.0010%. The desulfurization process can no longer fully meet the needs of large-scale production. Therefore, the development of a rapid smelting process for ultra-low sulfur steel has become a development bottleneck for various steel companies to develop high value-added varieties of steel and profit growth points. In or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/06C21C7/064
Inventor 曹余良姚永宽蔡可森周贺贺周桂成吴俊平吴国平朱安静王永瑞
Owner NANJING IRON & STEEL CO LTD
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