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1500MPa-grade hot-formed steel with double-sided non-equal-thickness aluminum-silicon coating and resistance spot welding method for 1500MPa-grade hot-formed steel

A thermoformed steel and resistance spot welding technology, which is applied in resistance welding equipment, coatings, welding equipment, etc., can solve the problems of insufficient service life of the new aluminum-silicon coated thermoformed steel resistance spot welding electrodes, and solve the problem of weldability , Improve cold bending performance, increase the effect of difficulty

Inactive Publication Date: 2021-04-23
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a 1500MPa double-sided non-equal-thick aluminum-silicon coating hot-formed steel product and its resistance spot welding method, which can solve the insufficient service life of the new aluminum-silicon-coated thermoformed steel resistance spot welding electrode to effectively improve the cold-bending properties of aluminum-silicon-coated hot-formed steel and the life of electrodes during resistance spot welding

Method used

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  • 1500MPa-grade hot-formed steel with double-sided non-equal-thickness aluminum-silicon coating and resistance spot welding method for 1500MPa-grade hot-formed steel
  • 1500MPa-grade hot-formed steel with double-sided non-equal-thickness aluminum-silicon coating and resistance spot welding method for 1500MPa-grade hot-formed steel

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Embodiment 1

[0032] 1) Preparation of hot-formed steel products with double-sided non-equal thickness aluminum-silicon coating:

[0033] Through the control of the smelting process, the main chemical components of the hot-formed steel substrate are: C: 0.10-0.25, Si: 0.10-0.50, Mn: 0.80-1.50, P: ≤0.03, S: ≤ 0.03, Al: ≤0.10, Cr: 0.10-0.50, Mo: ≤0.03, B: 0.004-0.01, N: ≤0.01, and the balance is Fe and unavoidable impurities. Through the control of continuous casting, hot rolling, acid rolling and other processes in the production process of the automobile sheet, a base material with a thickness of 1.2 mm and the properties of the components meeting the requirements is obtained.

[0034] In the hot-dip coating process, through the control of the process, the products with the characteristics of "coating 1" and "coating 2" are respectively obtained on the surface of the substrate, and double-sided non-equal thickness aluminum-silicon coated steel sheets are obtained. The aluminum-silicon coati...

Embodiment 2

[0045] 1) Preparation of hot-formed steel products with double-sided non-equal thickness aluminum-silicon coating:

[0046] Through the control of the smelting process, the main chemical components of the hot-formed steel substrate are: C: 0.10-0.25, Si: 0.10-0.50, Mn: 0.80-1.50, P: ≤0.03, S: ≤ 0.03, Al: ≤0.10, Cr: 0.10-0.50, Mo: ≤0.03, B: 0.004-0.01, N: ≤0.01. The balance is Fe and unavoidable impurities. Through the control of continuous casting, hot rolling, acid rolling and other processes in the production process of the automobile sheet, a base material with a thickness of 1.5 mm and the properties of the components meeting the requirements is obtained.

[0047] In the hot-dip coating process, through the control of the process, products with the characteristics of "coating 1" and "coating 2" are respectively obtained on the surface of the substrate, and double-sided non-equal thickness aluminum-silicon coated steel sheets are obtained. The aluminum-silicon coating is h...

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Abstract

The invention discloses a 1500MPa-grade hot-formed steel product with a double-sided non-equal-thickness aluminum-silicon coating and a resistance spot welding method for the 1500MPa-grade hot-formed steel product. By controlling the double-sided non-equal-thickness of the aluminum-silicon coating in a hot dipping process in the production process of raw materials, the hot-formed steel product having a double-sided non-equal-thickness coating is realized, wherein the thickness of one side of a steel plate is 3-19 microns ( a coating on the side is defined as a "coating 1"), and the thickness of the other side is 20-33 microns (the coating on this side is defined as a "coating 2"). In the hot stamped part production process, a lap joint is reasonably arranged: a workpiece coating 2 serves as the contact surface with a welding electrode, and a workpiece coating 1 serves as the contact surface between parts. For the product disclosed by the invention, while the cold bending performance of traditional hot-formed steel with an aluminum-silicon coating is improved, the problem that a resistance spot welding electrode of a novel hot-formed steel with the aluminum-silicon coating is short in service life can be solved, the cold bending performance of the hot-formed steel with an aluminum-silicon coating is effectively improved, and the service life of an electrode during resistance spot welding is effectively prolonged.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a hot-formed steel product with 1500MPa double-sided non-equal thickness aluminum-silicon coating and a resistance spot welding method thereof. Background technique [0002] Resistance spot welding has been widely used in the automotive industry due to its advantages of high production efficiency and easy automation. It is also one of the most important welding methods for thermoformed parts. [0003] CN101583486B patent provides a hot stamping coated steel sheet product and its preparation method. The patented product is an aluminum-silicon coated hot-formed steel product with a conventional thickness. The pre-coating thickness of the hot-stamped coated steel sheet used is 20-33 μm, and the pre-coating thickness of 25 μm is generally used in the industry. After hot stamping, the component is covered with a 30-40 μm coating, which has a 4-layer structure (see CN1015...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/32C23C2/12C23C2/40C23C2/28B23K11/11B23K11/36
CPCB23K11/11B23K11/36C22C38/001C22C38/02C22C38/04C22C38/06C22C38/22C22C38/32C23C2/12C23C2/28C23C2/40
Inventor 刘东亚王伟峰刘永刚詹华崔磊张军计遥遥晋家春
Owner MAANSHAN IRON & STEEL CO LTD
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