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Alloy cladding layer of hot stamping steel and preparing method of alloy cladding layer

A technology of alloy coating and hot stamping, applied in hot-dip plating process, metal material coating process, coating, etc. The effect of high temperature

Inactive Publication Date: 2017-01-04
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is mainly used in the technical field of hot-dip plating on the surface of steel plates and steel structural parts, and has not been applied in the technical field of hot stamping.

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  • Alloy cladding layer of hot stamping steel and preparing method of alloy cladding layer
  • Alloy cladding layer of hot stamping steel and preparing method of alloy cladding layer
  • Alloy cladding layer of hot stamping steel and preparing method of alloy cladding layer

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preparation example Construction

[0025] The preparation method of the alloy coating of hot stamping steel of the present invention is as follows:

[0026] First, configure the plating solution, its composition includes 40-65wt% Zn, 2-8wt% Si, 25-57wt Al, and unavoidable impurities; in the unavoidable impurities, there will be 1-3wt% Fe, other Introduced by the dissolution of strip steel and equipment immersed in the bath.

[0027] The main purpose of adding aluminum in the above-mentioned zinc solution is to improve the oxidation resistance of the coating at high temperature. The existence of aluminum element has three main effects: first, it is to improve the high temperature oxidation resistance of the coating; The reaction forms an alloy layer, which reduces the corrosion of the austenite grain boundary by zinc elements at high temperatures, and avoids the generation of large cracks in the substrate during the stamping process; the third is to improve the corrosion resistance of the coating after stamping....

Embodiment 1

[0034] Selection of steel plates: Select steel grades containing (by weight percentage): 0.18% carbon, 0.24% silicon, 0.9% manganese, 0.015% phosphorus, 0.005% sulfur, 0.038% aluminum, 0.032% titanium, 0.003% boron, 0.195% chromium, 0.027% nitrogen, 0.0002% calcium, and others are iron and unavoidable impurities. After the steel is smelted in a vacuum furnace, it is hot-rolled and cold-rolled. The thickness of the steel plate after cold-rolling is 1.4mm.

[0035] Steel plate treatment: select the steel plate with a size of 220×120×1.4mm, degrease it, clean it and dry it to ensure that there is no residual oil on the surface of the steel plate.

[0036] The deployment of plating solution: the composition of the plating solution is selected as (in mass percentage): Zn content is 55%, Si content is 5%, Al content is 38%, and the balance is Fe and other unavoidable impurities. After the components of the plating solution are prepared, put them into the crucible to heat and melt th...

Embodiment 2

[0043] Selection of steel plates: Select steel grades containing (in weight percentage): 0.21% carbon, 0.54% silicon, 1.9% manganese, 0.014% phosphorus, 0.004% sulfur, 0.048% aluminum, 0.038% titanium, 0.0025% boron, 0.205% chromium, 0.028% nitrogen, 0.0003% calcium, and others are iron and unavoidable impurities. After the steel is smelted in a vacuum furnace, it is hot-rolled and cold-rolled. The thickness of the steel plate after cold-rolling is 1.4mm.

[0044] The composition of the plating solution is selected as follows (by mass percentage): Zn content is 40%, Si content is 2%, Al content is 56%, and the balance is other unavoidable impurities. After the cold-rolled steel strip is annealed under the protection of a hydrogen atmosphere, it is cooled to 640°C and held for 10s to make the plate temperature uniform, and then immediately dipped in the prepared plating solution. The temperature of the plating solution is 580°C, and the dipping time is 3.5s. Then cool to room t...

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Abstract

The invention discloses an alloy cladding layer of hot stamping steel and a preparing method of the alloy cladding layer. The hot stamping steel is plated with a layer of alloy cladding layer mainly containing Zn, Si and Al; and as the cladding layer contains Al and Si, the high temperature resistance of the cladding layer is improved, Fe-Al-Si alloy diffusion layer textures will be formed on a steel plate base material, grain boundary diffusion of Zn to steel austenite in the heating process can be effectively prevented, and generation of stamping cracks of a base body is restrained. In addition, due to existence of Zn, the cladding layer has the good corrosion resistance, and particularly has the good scratch corrosion resistance. In this way, the hot stamping steel has the high temperature resistance in the heating process and has the good notch resisting protection performance after stamping.

Description

technical field [0001] The invention relates to hot stamping steel coating technology, in particular to an alloy coating of hot stamping steel and a preparation method thereof. Background technique [0002] In recent years, with the increasing demand for ultra-high-strength steel plates in the automotive industry, the consumption of ultra-high-strength steel plates has grown rapidly. However, problems such as high processing and forming load and large springback during cold processing of high-strength plates are becoming more and more prominent. In order to solve this problem, thermoforming technology has been widely used. At higher temperatures, steel plates have excellent formability and the tensile strength of stamping parts prepared by thermoforming can reach more than 1500MPa. [0003] Oxide skin and decarburization will occur during the heating process of traditional hot stamping parts. The oxide scale adheres to the mold during the stamping process, which will not on...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/12C23C2/40
Inventor 李俊杨洪林刘昕刘益民王健
Owner BAOSHAN IRON & STEEL CO LTD
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