High-strain hardening index hot-dip galvanized high-strength steel and production method thereof

A hardening index and hot-dip galvanizing technology, which is applied in the field of hot-dip galvanized high-strength steel and hot-dip galvanized steel sheet, can solve the problems of poor drawing performance and galvanizing performance, achieve good elongation and drawing performance, and alleviate cracks Effect of formation and expansion, high strength and ductility

Inactive Publication Date: 2010-12-01
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

[0005] The purpose of the present invention is to overcome the current disadvantages of poor drawing performance and galvanizing performance, and to provide a method of changing the chemical composition and production process to make the zinc layer of galvanized steel sheet have good adhesion and the strain hardening index, that is, the n value is not low. Hot-dip galvanized steel sheet with a yield strength of 400-450MPa, a tensile strength of not less than 600MPa, and an elongation of not less than 28% at 0.23 and its production method

Method used

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  • High-strain hardening index hot-dip galvanized high-strength steel and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] For hot-dip galvanized high-strength steel with high strain hardening index, the composition and weight percentage of the substrate are: C: 0.11, Al: 1.22, Mn: 1.55, Si: 0.07, Cr: 1.0, P: 0.013, S: 0.008, Yu The amount is Fe and unavoidable impurities.

[0040]A method for producing hot-dip galvanized high-strength steel with a high strain hardening index, the steps of which are:

[0041] 1) The smelting is carried out under the condition of a vacuum degree of 80Pa, the smelting temperature is controlled at 1590-1595°C, and the blank is continuously cast;

[0042] 2) Heating the continuous casting slab to 1200-1210°C and keeping it at this temperature for 160 minutes;

[0043] 3) Rough rolling is carried out, and the rough rolling temperature is controlled to be 1080-1096°C;

[0044] 4) Carry out finish rolling, control its finish rolling temperature to be 860~875 ℃, plate thickness is controlled at 3 millimeters;

[0045] 5) Carry out coiling, control its coiling te...

Embodiment 2

[0054] For hot-dip galvanized high-strength steel with high strain hardening index, the composition and weight percentage of the substrate are: C: 0.15, Al: 1.10, Mn: 1.75, Si: 0.21, Cr: 1.26, P: 0.015, S: 0.009, Yu The amount is Fe and unavoidable impurities.

[0055] A method for producing hot-dip galvanized high-strength steel with a high strain hardening index, the steps of which are:

[0056] 1) The smelting is carried out under the condition of vacuum degree of 67Pa, the smelting temperature is controlled at 1600-1610°C, and the blank is continuously cast;

[0057] 2) Heating the continuous casting slab to 1220-1235°C and keeping it at this temperature for 170 minutes;

[0058] 3) Rough rolling is carried out, and the rough rolling temperature is controlled to be 1090-1105°C;

[0059] 4) Carry out finish rolling, control its finish rolling temperature to be 880~890 ℃, plate thickness is controlled at 3.2 millimeters;

[0060] 5) Carry out coiling, control its coiling ...

Embodiment 3

[0069] For hot-dip galvanized high-strength steel with high strain hardening index, the composition and weight percentage of the substrate are: C: 0.15, Al: 1.00, Mn: 1.76, Si: 0.15, Cr: 1.50, P: 0.012, S: 0.010, Nb : 0.10, the balance is Fe and unavoidable impurities.

[0070] A method for producing hot-dip galvanized high-strength steel with a high strain hardening index, the steps of which are:

[0071] 1) The smelting is carried out under the condition of vacuum degree of 105Pa, the smelting temperature is controlled at 1620-1630°C, and the blank is continuously cast;

[0072] 2) Heating the continuous casting slab to 1260-1270°C and keeping it at this temperature for 178 minutes;

[0073] 3) Carry out rough rolling, and control the rough rolling temperature to be 1110-1120°C;

[0074] 4) Carry out finish rolling, control its finish rolling temperature to be 890~900 ℃, plate thickness is controlled at 3.5 millimeters;

[0075] 5) Carry out coiling, control its coiling t...

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Abstract

The invention relates to a hot-dip galvanized high-strength steel and a production method thereof. A base plate of the steel comprises the following components in percentage by weight: 0.11-0.20% of C, 0.51-1.22% of Al, 1.50-2.00% of Mn, 0.07-0.30% of Si, 1.0-2.0% of Cr, no more than 0.015% of P, no more than 0.015% of S, the balance Fe and unavoidable impurities. The production method comprises the following processing steps: smelting and continuously casting into billets; heating the continuous casting billets and maintaining the temperature; roughly rolling; finishing rolling; coiling and carrying out cold rolling; and carrying out hot-dip galvanizing: heating the steel plate after the cold rolling, maintaining the temperature, quickly cooling to 480-510 DEG C, galvanizing and carrying out dip plating for 5-9 seconds, and then cooling to room temperature. The invention solves the problem of galvanizing difficulty of the traditional high-Si content high-strength steel, has the advantages of favorable platability, high drawing performance and good welding performance, corrosion resistance and shaping performance, and has favorable market application prospects and prominent social benefit and economic benefit.

Description

technical field [0001] The invention relates to a galvanized steel, which specifically belongs to hot-dip galvanized high-strength steel. Specifically, it is a kind of strain hardening index, that is, the n value exceeds 0.230, the yield strength is 400-450MPa, and the tensile strength is not less than 600MPa. Hot-dip galvanized steel sheet with an elongation of not less than 28% and its production method. Background technique [0002] High-strength, high-plasticity hot-dip galvanized steel sheets can be used to manufacture automobile structural parts, improve automobile safety, and also increase corrosion resistance, which can reduce the thickness of steel sheets by more than 20%, reduce the total weight of automobiles, and reduce both material consumption and fuel consumption. Consumption and exhaust emissions, vigorously developing high-strength steel is an important method for automobile lightweight. [0003] In recent years, the formability of high-strength steel plate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/38C21D8/02
CPCC21D6/002C23C2/02C23C2/28C22C38/02C21D6/005C22C38/06C22C38/38C23C2/29C23C2/0224
Inventor 王立辉陈宇
Owner 武汉钢铁有限公司
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