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A kind of hot-dip galvanized high-strength steel with a tensile strength of 1000mpa and its reduction production method

A technology of tensile strength and hot-dip galvanizing, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of difficult cold rolling, heavy rolling load, long production process, etc., to achieve The effect of shortening the production process, improving production efficiency, reducing energy consumption and CO2 emissions

Active Publication Date: 2021-05-28
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method has difficulties in cold rolling when producing 1000MPa grade galvanized ultra-high-strength steel, large rolling load, long production process, large energy consumption and CO 2 The outstanding problem of emissions needs to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This example provides a hot-dip galvanized high-strength steel with a tensile strength of 1000 MPa, which is produced specifically according to the following steps: smelting, continuous casting → heating or soaking → 3 passes of rough rolling → 5 passes of finish rolling → cooling → coiling → pickling → continuous stripping → galvanizing → finishing → finished product.

[0044] Using converter, LF refining, RH vacuum smelting, the steel composition is controlled as 0.16%C, 0.30%Si, 1.8%Mn, 0.35%V, 0.020%Als, 0.15%Mo, 0.002%P, 0.002%S, 0.003%N, 0.04% Ti, the cast slab is continuously cast, the thickness of the cast slab is 80mm, the cast slab is heated to 1220°C, and then rough rolled three times to obtain a 15mm intermediate billet, the rough rolling finish rolling temperature is 1050°C, the rough rolling The reduction ratio is 81.3%, followed by 5 passes of finish rolling, the finish rolling temperature is 900°C, the product thickness is 2.0mm, the finish rolling reduc...

Embodiment 2

[0047] This embodiment provides a hot-dip galvanized high-strength steel with a tensile strength of 1000 MPa, which is produced according to the following steps: smelting, continuous casting → 3 passes of rough rolling → heating or soaking → 5 passes of finish rolling → cooling → coiling → pickling → continuous stripping → galvanizing → finishing → finished product.

[0048] Using converter, LF refining, RH vacuum smelting, the steel composition is controlled as 0.15%C, 0.30%Si, 1.8%Mn, 0.30%V, 0.03%Als, 0.006%P, 0.001%S, 0.004%N, 0.03%Ti, 0.003% B, the cast slab is continuously cast, the thickness of the cast slab is 120mm, the cast slab is rough rolled three times to obtain an intermediate slab of 18mm, the rough rolling reduction rate is 90%, and the rough rolling finish rolling temperature is 1040°C. Then heat up to 1080°C, and then carry out 5 passes of finish rolling, the finish rolling temperature is 900°C, the product thickness is 1.6mm, the rough rolling reduction rat...

Embodiment 3

[0051] This example provides a hot-dip galvanized high-strength steel with a tensile strength of 1000 MPa, which is produced specifically according to the following steps: smelting, continuous casting → heating or soaking → 7 passes of finishing rolling → cooling → coiling → pickling → continuous annealing →galvanizing→finishing→finished product.

[0052] Using converter, LF refining, RH vacuum smelting, the steel composition is controlled to be 0.06%C, 0.50%Si, 2.2%Mn, 0.39%V, 0.010Nb%, 0.02%Als, 0.002%P, 0.002%S, 0.30%Cr, 0.002% N, 0.003% B, the cast slab is continuously cast, the thickness of the cast slab is 56mm, the cast slab is heated, the furnace temperature is 1220°C, and then 7 passes of finish rolling are carried out, and the finish rolling temperature is 860°C to obtain 1.2 mm finished product, finishing rolling reduction rate 97.8%, rapid cooling after finishing rolling, average cooling rate above 650°C 45°C / s, coiling temperature 400°C, pickling the hot-rolled st...

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Abstract

The invention relates to a hot-dip galvanized high-strength steel with a tensile strength of 1000 MPa and a reduction production method thereof. The hot-dip galvanized high-strength steel comprises the following components: C: 0.06-0.18%, Mn: 1.60-2.50%, Als: 0.005~0.050%, Si: 0.10~0.50%, V: 0.20~0.40%, P: ≤0.015%, S: ≤0.010%, N: ≤0.008%, the product microstructure mainly consists of 85~95% ferrite, 0-10% bainite, 0-10% martensite, and the volume percentage of precipitates ≤ 10nm in the steel is 0.2-1%. Its production methods are: steelmaking, refining, continuous casting and hot rolling, pickling, annealing and galvanizing, skin skinning, which saves the cold rolling process of the traditional production process, the production process is significantly shortened, and the energy consumption and CO 2 Emissions can be greatly reduced and production efficiency significantly improved.

Description

technical field [0001] The invention relates to the technical field of hot-dip galvanized ultra-high-strength steel manufacturing, and relates to a hot-dip galvanized high-strength steel with a tensile strength of 1000 MPa and a reduction production method thereof. Background technique [0002] In recent years, in order to reduce energy consumption during the use of automobiles and reduce CO 2 Emissions, steel for automobiles, etc. are developing in the direction of thin thickness and high strength, and ultra-high-strength steel of 1000MPa level and above is one of the main development directions. Compared with ordinary cold-rolled high-strength steel, galvanized high-strength steel not only has high strength, but also has good corrosion resistance, so galvanized ultra-high-strength steel above 1000MPa is widely used. [0003] In the prior art, the microstructure of 1000MPa galvanized ultra-high-strength steel is mainly 15-60% ferrite and 30-80% martensite, bainite and reta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C23C2/06C21D8/02C23C2/40
CPCC21D8/0205C21D8/0226C21D8/0273C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/12C23C2/06C23C2/40
Inventor 谭文潘利波王俊霖胡宽辉孙伟华杨奕祝洪川
Owner 武汉钢铁有限公司
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