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Production method of 1500MPa-grade ultrahigh-strength Zn-Cr composite coating hot-formed steel

A technology of ultra-high strength and production method, which is applied in the field of rolling to achieve the effect of preventing surface oxidation and good corrosion resistance

Pending Publication Date: 2021-10-19
武汉钢铁有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, there are few reports on production methods involving Zn-Cr composite coating 1500MPa grade hot-formed steel

Method used

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  • Production method of 1500MPa-grade ultrahigh-strength Zn-Cr composite coating hot-formed steel
  • Production method of 1500MPa-grade ultrahigh-strength Zn-Cr composite coating hot-formed steel

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Embodiment

[0023] Substrate

[0024] The steel plate is designed with MnB composition: C: 0.21~0.25, Si: 0.26~0.30, Mn: 1.0~1.3, P: ≤0.010, S: ≤0.005, Als: 0.015~0.060, Cr: 0.25~0.30, Ti: 0.026~ 0.030, B: 0.003~0.004, Nb: 0.026~0.030, V: 0.026~0.030, N: ≤0.005

[0025] A method for manufacturing ultra-high-strength hot-formed steel with a Zn-Cr composite coating of 0.8 to 2.0 mm in thickness by direct rolling of medium and thin slabs, mainly including electric furnace or converter smelting, refining, continuous casting of medium and thin slabs, and soaking of slabs , rolling, laminar cooling, coiling, electrochrome plating and electrogalvanizing, heating austenitization, die stamping forming quenching.

[0026] The superheat of molten steel in tundish is 15~30℃;

[0027] The slab thickness of the medium-thin slab continuous casting is 52-55mm, and the casting speed is 3.7-7.0m / s;

[0028] Descaling treatment is carried out before the slab of the medium-thin slab continuous casting is ...

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Abstract

The invention discloses a production method of 1500MPa-grade ultrahigh-strength Zn-Cr composite coating hot-formed steel. The production method comprises the following steps: directly rolling ultrahigh-strength hot-formed steel by adopting a medium-thin slab, electroplating a Cr + Zn surface composite coating, electroplating a thin coating Cr before galvanizing, and utilizing the high melting point, corrosion resistance and wear resistance of Cr, the surface oxidation in the hot stamping process can be reduced, the corrosion resistance of the product is improved, and microcrack diffusion can be effectively avoided. The invention provides Zn-Cr composite coating hot-formed steel capable of avoiding micro-cracks in order to solve the problem of micro-cracks existing in zinc-based coating hot-formed steel. A Zn-Cr alloy layer is formed in the hot stamping period by utilizing the characteristic of high melting point of chromium, so that the LME phenomenon of the zinc coating in the hot stamping process is avoided.

Description

technical field [0001] The invention relates to the technical field of rolling and electroplating processes, in particular to a production method of 1500MPa ultra-high-strength Zn-Cr composite coating hot-formed steel. Background technique [0002] With the development of the automobile industry and the improvement of national laws and regulations on the automobile industry, automobile design and manufacturing are gradually developing in the direction of energy saving, environmental protection and safety. The lightweight design of the body has become the mainstream of automobile design at present and for a long time in the future. It can greatly reduce the weight of the body without reducing the safety of the collision of the body. Hot-formed steel can not only meet the ultra-high-strength thinning requirements of automobile body design, but also smoothly complete complex deformation without springback, and the dimensional accuracy of parts is high. One of the key steps in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28C22C38/32C25D3/04C25D3/22
CPCC22C38/32C22C38/28C22C38/26C22C38/24C22C38/06C22C38/04C22C38/02C22C33/04C25D3/04C25D3/22
Inventor 冯冠文葛锐蔡捷胡宽辉黄道兵陈寅刘永前
Owner 武汉钢铁有限公司
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