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Method for producing steel plate through super-fast cooling technology

An ultra-fast cooling and process technology, which is applied in steel plates for subsea tunnels, high-strength bridge steel plates produced by ultra-fast cooling processes, and steel plates produced by ultra-fast cooling processes. It can solve the problems of high strength, high elongation, and impact resistance. , Difficult to adapt to high strength, high elongation, impact resistance, unable to meet the needs of high strength, etc., to achieve good comprehensive mechanical properties, save production technology, and save production costs

Active Publication Date: 2019-04-16
河北敬业中厚板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN101135029 A records atmospheric corrosion-resistant steel with a yield strength of 700MPa and its manufacturing method, but its strength is low and cannot meet the high-strength requirements of different occasions
CN103114253 A records a production method of ultra-thin ultra-high-strength steel plates with a finished product thickness of 3-10mm. Although yield strength Rp0.2 can be obtained up to 950-1300MPa, tensile strength Rm: 1000-1500MPa, fracture Elongation A: 12-20%, -40°C impact absorption energy KV2: 80-270J, but the hot-rolled substrate has undergone two quenching + tempering heat treatment processes, which obviously affects production efficiency
CN103302255 A has recorded a kind of thin-strip continuous casting 700MPa level high-strength atmospheric corrosion-resistant steel manufacturing method, the yield strength of its steel strip is at least 700MPa, tensile strength is at least 780MPa, and elongation is at least 18%, is also difficult to adapt to high strength, New requirements for comprehensive properties such as high elongation and impact resistance
[0004] In addition, the current research on the ultra-fast cooling process is mainly concentrated in the fields of automobile steel plates and X70 and X80 pipeline steels. For the above-mentioned high-strength bridge steel plates and steel plates for submarine tunnels, the ultra-fast cooling process is used to improve high strength and high elongation. , impact resistance and other comprehensive performance research is less

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for producing steel plates by an ultra-fast cooling process, characterized in that: the components are C0.066%, Si 0.06%, Mn 1.52%, P≤0.01%, S≤0.004%, Nb 0.067%, Ti 0.023% by mass percentage %, V0.033%, Al≤0.050%, Cr 0.46%, Mo 0.36%, Ni 0.14%, Cu 0.06%, W 0.015%, rare earth 0.0005%, N 0.003%, the balance is Fe and unavoidable impurity elements ;

[0047] The process route includes: molten iron pretreatment → molten steel smelting → refining outside the furnace → continuous casting → heating and rolling → ultra-fast cooling process and coiling; the core steps are as follows:

[0048] (1) Hot metal pretreatment desulfurization;

[0049] (2) Converter smelting: Double slag operation, converter bottom blowing, carbon content target ≤0.055%, phosphorus content ≤0.015%, tapping temperature 1600-1650°C; double slag blocking tapping with slag blocking plug and slag blocking rod ;

[0050] (3) LF+RH refining process or RH or VD vacuum degassing;

[0051] (4) Continu...

Embodiment 2

[0056] A method for producing steel plates by an ultra-fast cooling process, characterized in that: the components are C0.068%, Si 0.08%, Mn 1.52%, P≤0.01%, S≤0.004%, Nb 0.067%, Ti 0.023% by mass percentage %, V0.032%, Al≤0.050%, Cr0.47%, Mo 0.37%, Ni 0.13%, Cu 0.06%, W 0.011%, rare earth 0.0007%, N 0.005%, the balance is Fe and unavoidable impurities element;

[0057] The process route includes: molten iron pretreatment → molten steel smelting → refining outside the furnace → continuous casting → heating and rolling → ultra-fast cooling process and coiling; the core steps are as follows:

[0058] (1) Hot metal pretreatment desulfurization;

[0059] (2) Converter smelting: Double slag operation, converter bottom blowing, carbon content target ≤0.055%, phosphorus content ≤0.015%, tapping temperature 1600-1650°C; double slag blocking tapping with slag blocking plug and slag blocking rod ;

[0060] (3) LF+RH refining process or RH or VD vacuum degassing;

[0061] (4) Continuo...

Embodiment 3

[0066] A method for producing steel plates by an ultra-fast cooling process, characterized in that: the components are C0.069%, Si 0.1%, Mn 1.55%, P≤0.01%, S≤0.004%, Nb 0.07%, Ti 0.025% by mass percentage %, V0.035%, Al≤0.050%, Cr0.48%, Mo 0.38%, Ni 0.15%, Cu 0.09%, W 0.01%, rare earth 0.001%, N 0.005%, the balance is Fe and unavoidable impurities element;

[0067] The process route includes: molten iron pretreatment → molten steel smelting → refining outside the furnace → continuous casting → heating and rolling → ultra-fast cooling process and coiling; the core steps are as follows:

[0068] (1) Hot metal pretreatment desulfurization;

[0069] (2) Converter smelting: Double slag operation, converter bottom blowing, carbon content target ≤0.055%, phosphorus content ≤0.015%, tapping temperature 1600-1650°C; double slag blocking tapping with slag blocking plug and slag blocking rod ;

[0070] (3) LF+RH refining process or RH or VD vacuum degassing;

[0071] (4) Continuous c...

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Abstract

The invention discloses a method for producing a steel plate through the super-fast cooling technology. The method is characterized in that components comprise, by mass percent, 0.066%-0.069% of C, 0.05%-0.1% of Si, 1.5%-1.55% of Mn, smaller than or equal to 0.01% of P, smaller than or equal to 0.004% of S, 0.13%-0.2% of (Nb+Ti+V), smaller than or equal to 0.050% of Al, at least three of Cr, Mo, Ni, Cu, W and rare earth, and the balance Fe and inevitable impurity elements. According to the super-fast cooling technology, the finish rolling temperature of 845-850 DEG C is reduced to 360-365 DEGC through cooling at the cooling speed of 80-90 DEG C / s, and reeling is conducted at the temperature of 350-355 DEG C.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a method for producing steel plates by an ultra-fast cooling process, in particular to a method for producing high-strength steel plates for bridges and submarine tunnels by an ultra-fast cooling process. Background technique [0002] Atmospheric corrosion-resistant low-alloy structural steel is widely used in the field of outdoor steel structure manufacturing such as buildings, bridges, containers, and vehicles. It is based on low-carbon manganese steel, adding a small amount of low-alloy corrosion-resistant elements such as Cr, Cu, Ni, etc., to promote the change of the rust layer structure of the steel, which is beneficial to slow down the atmospheric corrosion rate and significantly improve the atmospheric corrosion resistance of the steel. [0003] CN101135029 A records atmospheric corrosion-resistant steel with a yield strength of 700MPa and its manufact...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42C22C38/06C22C38/02C22C33/04C21D8/02C21D11/00
CPCC21D8/0205C21D8/0226C21D11/005C21D2211/005C21D2211/008C22C33/04C22C38/001C22C38/002C22C38/005C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 杨海西张少凯樊利智曹晓运
Owner 河北敬业中厚板有限公司
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