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A production method of low inclusion clean steel

A production method and technology for cleaning steel, applied in the field of metal materials, can solve the problems of low level of steel equipment, poor quality awareness, low technical level, etc., and achieve the effects of saving process costs, improving production efficiency, and reducing the generation of inclusions

Active Publication Date: 2020-11-03
JINGYE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in general, as far as clean steel production is concerned, my country's steel has problems such as low equipment level, poor product structure, weak quality awareness, and low technical level.

Method used

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  • A production method of low inclusion clean steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The production method of low-inclusion clean steel is characterized in that the steel composition is C 0.012%, Si 0.15%, Mn 0.85%, P 0.001%, S 0.001%, Nb 0.045%, Ti 0.01%, Al 0.002% , Cr1.85%, Mo 0.65%, Ni 2.55%, Cu 0.15%, W 0.005%, Zr 0.0001%, Ta 0.0001%, rare earth La+Y 0.0001%, La:Y mass ratio is 2:1, B 0.0001% , N 0.0025%, the balance is Fe and unavoidable impurity elements.

[0050] The process route includes: ratio preparation → hot metal pretreatment desulfurization → converter smelting → LF refining → RH refining → continuous casting → rolling → coiling; the specific steps are as follows:

[0051] (1) Desulfurization by KR molten iron pretreatment: slag removal to ensure that the thickness of the slag layer on the liquid surface is ≤15mm, the oxygen blowing time is 14-18min, the oxygen supply intensity is 10000-13000m3 / h, the S content of the molten iron before treatment is ≤0.03%, and the injection particle size Granular magnesium with a particle size of 1.2-1...

Embodiment 2

[0059] The production method of low-inclusion clean steel is characterized in that: the steel composition is C0.013%, Si 0.16%, Mn0.86%, P 0.003%, S 0.002%, Nb 0.05%, Ti 0.011%, Al 0.003%, Cr 1.9%, Mo 0.7%, Ni 2.6%, Cu 0.17%, W 0.006%, Zr 0.0002%, Ta 0.002%, rare earth La+Y 0.0002%, La:Y mass ratio is 2:1, B 0.0003%, N 0.004 %, the balance is Fe and unavoidable impurity elements.

[0060] The process route includes: ratio preparation → hot metal pretreatment desulfurization → converter smelting → LF refining → RH refining → continuous casting → rolling → coiling; the specific steps are as follows:

[0061] (1) Desulfurization by KR molten iron pretreatment: slag removal to ensure that the thickness of the slag layer on the liquid surface is ≤15mm, the oxygen blowing time is 14-18min, the oxygen supply intensity is 10000-13000m3 / h, the S content of the molten iron before treatment is ≤0.03%, and the injection particle size Granular magnesium with a particle size of 1.2-1.5 cm ...

Embodiment 3

[0069]The production method of low inclusion clean steel is characterized in that: C0.015%, Si 0.18%, Mn 0.88%, P0.005%, S 0.005%, Nb 0.055%, Ti 0.012%, Al 0.004%, Cr 1.95%, Mo 0.75%, Ni2.65%, Cu 0.19%, W 0.008%, Zr 0.0004%, Ta 0.005%, rare earth La+Y0.0005%, La:Y mass ratio is 2:1, B 0.0005%, N 0.005% , the balance being Fe and unavoidable impurity elements.

[0070] The process route includes: ratio preparation → hot metal pretreatment desulfurization → converter smelting → LF refining → RH refining → continuous casting → rolling → coiling; the specific steps are as follows:

[0071] (1) Desulfurization by KR molten iron pretreatment: slag removal to ensure that the thickness of the slag layer on the liquid surface is ≤15mm, the oxygen blowing time is 14-18min, the oxygen supply intensity is 10000-13000m3 / h, the S content of the molten iron before treatment is ≤0.03%, and the injection particle size Granular magnesium with a particle size of 1.2-1.5 cm and lime powder with ...

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Abstract

A production method of low inclusion clean steel is disclosed; a steel material is prepared according to a prescribed ratio, the steel material satisfies the following conditions: the atomic ratio ofNb:Ti:Mo in a Nb, Ti and Mo carbonitride precipitate in the steel material is 4:1:0.2, the particle size of the precipitate is 40-60nm, the final microstructure comprises bainite with the area ratio of 97% or more, ferrite and pearlite with the area ratio of 3% or below, the average grain size is 2-5mu m; the yield strength is 730-810MPa, the tensile strength is 850-930MPa, the impact toughness is110-130J at-40 DEG C, and the elongation rate is 17-20%.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a production method of low-impurity clean steel. Background technique [0002] Clean steel production is one of the important directions of steelmaking technology development in the 1990s, and clean steel has very strict requirements on the content of impurity elements in steel, and the mass fraction of sulfur and phosphorus is generally required to be no more than 0.01%. There are also quite strict control requirements for the content of hydrogen, oxygen and low melting point metals. In order to meet the requirements, the current research on clean steel smelting process mainly includes two aspects: reducing the content of impurity elements in steel as much as possible through new technology; strictly controlling the quantity and form of non-metallic inclusions in steel through new technology. The former is the primary task of clean steel research at present....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/48C22C38/50C22C38/06C22C38/44C22C38/42C21C7/064C21C5/28C21C5/36C21C7/10C21D8/02
CPCC21C5/28C21C5/36C21C7/0645C21C7/10C21D8/0226C21D2211/002C21D2211/005C22C38/001C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50Y02P10/20
Inventor 张素英张觉灵杨海西曹喜军
Owner JINGYE STEEL CO LTD
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