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Ultra-high-strength zinc-aluminum-magnesium-coated steel sheet for high-temperature forming and manufacturing method thereof

A technology for forming and coating steel sheets at high temperature, applied in coating, hot-dip coating process, metal material coating process, etc., can solve the problems of high corrosion resistance, coating composition and process limitations, low productivity, etc., and achieve anti-corrosion Excellent corrosion performance

Active Publication Date: 2019-03-26
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 Al-Si coating is resistant to high temperature, but does not have the incision protection performance; the electroplated zinc-nickel (Zn-10% Ni) coating has good high temperature resistance and incision protection performance, but its disadvantages are that it is more expensive and has low productivity; GI and GA coatings are easy to form cracks in hot forming process to induce cracking of steel substrate
The aforementioned prior art discloses Al-Si or Zn-Mn-Fe coatings, which are difficult to meet the requirements of high corrosion resistance due to coating composition and process limitations

Method used

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  • Ultra-high-strength zinc-aluminum-magnesium-coated steel sheet for high-temperature forming and manufacturing method thereof
  • Ultra-high-strength zinc-aluminum-magnesium-coated steel sheet for high-temperature forming and manufacturing method thereof
  • Ultra-high-strength zinc-aluminum-magnesium-coated steel sheet for high-temperature forming and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] An ultra-high-strength zinc-aluminum-magnesium-coated steel sheet for high-temperature forming, its composition and weight percentage are: C: 0.25%, Si: 0.25%, Mn: 2.35%, Cr: 0.4%, B: 0.0024%, Ti: 0.037% , Nb: 0.025%, Al: 0.06%, N: 0.0028%, and the rest are Fe and unavoidable impurities. The chemical composition weight percent of the plating solution is: Al: 2.4%, Mg: 1.3%, and the rest are Zn and unavoidable impurities.

[0039] The production steps of coated steel plate are as follows:

[0040] 1) Smelting and continuous casting into billets according to the chemical composition;

[0041] 2) Hot continuous rolling controls the final rolling temperature to 880°C, the total reduction rate to 90%, and the coiling temperature to 710°C;

[0042] 3) The total reduction rate of cold rolling control is 65%;

[0043] 4) Heat the steel strip in the dew point range of -30°C to 820°C, in H 2 In a reducing atmosphere with a volume percentage of 30%, cool to 495°C at a cooling ...

Embodiment 2

[0047] An ultra-high-strength zinc-aluminum-magnesium-coated steel sheet for high-temperature forming, its composition and weight percentage are: C: 0.35%, Si: 0.25%, Mn: 2.35%, Cr: 0.4%, B: 0.0041%, Ti: 0.045% , Nb: 0.034%, Al: 0.034%, N: 0.0035%, and the rest are Fe and unavoidable impurities. The chemical composition weight percent of the plating solution is: Al: 7.1%, Mg: 1.6%, and the rest are Zn and unavoidable impurities.

[0048] The production steps of coated steel plate are as follows:

[0049] 1) Smelting and continuous casting into billets according to the chemical composition;

[0050] 2) Hot continuous rolling controls the final rolling temperature to 800°C, the total reduction rate to 80%, and the coiling temperature to 700°C;

[0051] 3) The total reduction ratio of cold rolling control is 55%;

[0052] 4) Heat the steel strip in the dew point range of 10°C to 780°C, H 2 The volume percentage is 20%, cooled to 475°C at a cooling rate of 30°C / s, holding time...

Embodiment 3

[0056] An ultra-high-strength zinc-aluminum-magnesium-coated steel sheet for high-temperature forming, its composition and weight percentage are: C: 0.53%, Si: 0.35%, Mn: 2.8%, Cr: 0.4%, B: 0.0055%, Ti: 0.063% , V: 0.1%, Al: 0.051%, N: 0.0049%, the remainder is Fe and unavoidable impurities. The chemical composition weight percent of the plating solution is: Al: 15.3%, Mg: 3.7%, and the rest are Zn and unavoidable impurities.

[0057] The production steps are as follows:

[0058] 1) Smelting and continuous casting into billets according to the chemical composition;

[0059] 2) Hot continuous rolling controls the final rolling temperature to 840°C, the total reduction rate to 95%, and the coiling temperature to 730°C;

[0060] 3) The total reduction ratio of cold rolling control is 75%;

[0061] 4) Heat the steel strip in the dew point range of 30°C to 840°C, H 2 The volume percentage is 10%, cooled to 465°C at a cooling rate of 15°C / s, holding time for 90s, then immersed i...

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Abstract

The invention discloses a super-strength zinc aluminum magnesium coated steel sheet for high-temperature shaping and a manufacture method thereof. The steel sheet comprises the following chemical components in percent by weight: 0.2 to 0.8 percent of C, 0.08 to 0.6 percent of Si, 1.5 to 5.0 percent of Mn, smaller than or equal to 0.08 percent of Al, smaller than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities. The steel sheet has the advantages that a plating layer is continuous and complete after being subjected to high-temperature heating and punch forming on the premise that the tensile strength is greater than or equal to 1700 MPa and the percentage elongation is greater than or equal to 5 percent after base plate hot embossing is met, and no cracks extending to a base body exists; the Zn content in plating alloy phase is not greater than 30 percent as a whole, and the corrosion resistance property of the plating layer is excellent; and the steel sheet can meet the requirement on light weight of anticorrosion high-strength automobile sheets.

Description

technical field [0001] The invention relates to metallurgical hot-press forming technology, in particular to an ultra-high-strength zinc-aluminum-magnesium coated steel plate for high-temperature forming and a manufacturing method thereof. Background technique [0002] In recent years, the market demand for automotive thermoformed parts has shown an explosive growth trend. The application proportion of thermoformed parts in body-in-white is as high as 45%, and it is expected to more than double in the next five years. In the earlier thermoforming technology, the surface of the steel plate was not treated with coating, and the surface would be oxidized to a certain extent during the thermoforming process, resulting in surface decarburization and oxidation peeling, which reduced production efficiency. Chromium shot peening can be used. method to remove surface oxides. [0003] With the development of thermoforming technology, coating technology is more and more applied to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C23C2/06C23C2/40C22C38/32C22C38/28C22C38/26C22C38/24C22C38/38C21D8/02
CPCC21D8/0226C21D8/0236C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38C23C2/06C23C2/40
Inventor 方芳胡宽辉杜小峰葛锐冯冠文陈寅周少云康斌
Owner 武汉钢铁有限公司
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