High-strength bridge steel prepared by an ultra-fast cooling process and its production method

A technology of steel for bridges and production methods, applied in the field of metal materials, can solve problems affecting production efficiency, low strength, and less research, and achieve good comprehensive mechanical properties, saving production costs, and saving production processes.

Active Publication Date: 2020-11-20
JINGYE STEEL CO LTD
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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. In the field of high-strength bridge steel, the ultra-fast cooling process is used to improve the comprehensive properties of high strength, high elongation, and impact resistance. less

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The high-strength bridge steel prepared by the ultra-fast cooling process is characterized in that the composition is C 0.065%, Si 0.05%, Mn 1.5%, P≤0.01%, S≤0.004%, Nb 0.065%, Ti0.02%, V 0.03%, Al≤0.050%, Cr0.45%, Mo 0.35%, Ni 0.12%, Cu 0.05%, rare earth 0.0001%, N 0.001%, the balance is Fe and unavoidable impurity elements; the production process is:

[0044] (1) Hot metal pretreatment desulfurization;

[0045] (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 ;

[0046] (3) LF+RH refining process or RH or VD vacuum degassing;

[0047] (4) Continuous casting process: blowing protective gas throughout the process to avoid oxidation and nitrogen increase;

[0048] (5) Heating and rolling; the billet is loaded into the heating furnace, the heating temperature is 1180-1220 ° C, the ...

Embodiment 2

[0052] The high-strength bridge steel prepared by the ultra-fast cooling process is characterized in that the composition is C 0.066%, Si 0.06%, Mn 1.52%, P≤0.01%, S≤0.004%, Nb 0.067%, Ti 0.023%, V 0.033%, Al≤0.050%, Cr0.46%, Mo 0.36%, Ni 0.14%, Cu 0.06%, rare earth 0.0005%, N 0.003%, the balance is Fe and unavoidable impurity elements; the production process is:

[0053] (1) Hot metal pretreatment desulfurization;

[0054] (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 ;

[0055] (3) LF+RH refining process or RH or VD vacuum degassing;

[0056] (4) Continuous casting process: blowing protective gas throughout the process to avoid oxidation and nitrogen increase;

[0057](5) Heating and rolling; the billet is loaded into the heating furnace, the heating temperature is 1180-1220 ° C, t...

Embodiment 3

[0061] The high-strength bridge steel prepared by the ultra-fast cooling process is characterized in that the composition is C 0.068%, Si 0.08%, Mn 1.55%, P≤0.01%, S≤0.004%, Nb 0.07%, Ti0.025%, V 0.035%, Al≤0.050%, Cr0.48%, Mo 0.38%, Ni 0.15%, Cu 0.09%, rare earth 0.001%, N 0.005%, the balance is Fe and unavoidable impurity elements; the production process is:

[0062] (1) Hot metal pretreatment desulfurization;

[0063] (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 ;

[0064] (3) LF+RH refining process or RH or VD vacuum degassing;

[0065] (4) Continuous casting process: blowing protective gas throughout the process to avoid oxidation and nitrogen increase;

[0066] (5) Heating and rolling; the billet is loaded into the heating furnace, the heating temperature is 1180-1220 ° C, the...

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Abstract

A high-strength bridge steel prepared by an ultra-fast cooling process is characterized by comprising the components by mass: 0.065-0.068% of C, 0.05-0.08% of Si, 1.5-1.55% of Mn, not more than 0.01%of P, not more than 0.004% of S, 0.13-0.2% of Nb+Ti+V, not more than 0.050% of Al, at least two of Cr, Mo, Ni, Cu and rare earth, and the balance Fe and unavoidable impurity elements.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a high-strength bridge steel prepared by an ultra-fast cooling process and a production method thereof. 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 manufacturing method, but its strength is low and cannot meet the high-strength requirements of different occ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/48C22C38/50C22C38/46C22C38/06C22C38/44C22C38/42C21D8/00
CPCC21D8/005C21D2211/005C22C38/001C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 张觉灵杨海西曹喜军樊利智
Owner JINGYE STEEL CO LTD
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