Method for hot-dip coating flat steel products containing 2-35% by weight mn and flat steel products

A technology of hot-dip plating and finished products, applied in the direction of hot-dip plating process, coating, metal material coating process, etc., can solve the problems of coating shedding, cracks, inability to meet economic and ecological needs, etc., and achieve good wettability The effect of wet, long-lasting connections

Active Publication Date: 2015-10-21
THYSSENKRUPP STEEL EURO AG
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Problems solved by technology

However, during the deformation of the corresponding coated flat steel product into a component, at high deformation rates, for example, the coating can fall off or cracks can form.
[0014] Furthermore, the methods known from the prior art also have a negative effect on the mechanical properties of the flat steel product, especially under the conditions of use at higher process temperatures
Moreover, operation suitable for economical and ecological requirements cannot be achieved in the required process

Method used

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  • Method for hot-dip coating flat steel products containing 2-35% by weight mn and flat steel products
  • Method for hot-dip coating flat steel products containing 2-35% by weight mn and flat steel products
  • Method for hot-dip coating flat steel products containing 2-35% by weight mn and flat steel products

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Experimental program
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Effect test

Embodiment Construction

[0050] High manganese steel having the composition shown in Table 1 was produced into cold strip in a known manner.

[0051] C mn P Si V Al Cr Ti Nb 0.634 22.2 0.02 0.18 0.2 0.01 0.08 0.001 0.001

[0052] residual iron and unavoidable impurities,

[0053] Expressed in % by weight.

[0054] Table 1

[0055] Then, the first sample of the cold-rolled strip was annealed in a single-stage annealing process.

[0056] For this purpose, a steel strip sample was heated at a heating rate of 10 K / s to an annealing temperature of 800° C., and the sample was then kept at this condition for 30 seconds. Here, the annealing is carried out in an annealing atmosphere with up to 5% by volume of H 2 and up to 95% by volume of N 2 composition, and a dew point of +25°C. Next, the annealed steel strip was cooled to a bath temperature of 480° C. at a cooling rate of 20 K / s, and then overaged for 20 seconds under this condition. H...

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Abstract

A method by which a flat steel product containing 2-35 wt. % of Mn can be provided with a coating of Zn which adheres well by annealing at an annealing temperature Ta of 600-1100° C. for an annealing time of 10-240 s under an annealing atmosphere which has a reducing effect on the FeO present on the flat steel product and an oxidising effect on the Mn contained in the steel substrate thereby forming a layer of Mn mixed oxide which covers the flat steel product at least in sections and then cooling the flat steel product to a temperature for bath entry and conveying it through a bath of molten Zn saturated within iron at a temperature of 420-520° C., within a dip time of 0.1-10 s.

Description

technical field [0001] The invention relates to a method for hot-dip coating a flat steel product containing 2-35% by weight of Mn by using zinc or a zinc alloy, and a flat steel product with a zinc coating or a zinc alloy coating. Background technique [0002] In modern automotive manufacturing, high-strength and very high-strength steels are in high demand. Typical alloying elements are manganese, chromium, silicon, aluminum and similar elements which form stable non-reducible oxides on the surface during conventional recrystallization annealing. These oxides hinder reactive wetting with the zinc melt. [0003] Because high manganese steel has high strength up to 1400MPa on the one hand, and extremely high elongation on the other hand (up to 70% average elongation and up to 90% elongation at break), high manganese steel based on good performance combination It is mainly used especially in the motor vehicle manufacturing industry, especially in the automobile manufacturin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/02C23C2/06
CPCC23C2/02C23C2/06C23C2/0222C23C2/0224C23C2/026
Inventor 曼弗雷德·莫伊雷尔马丁·诺登威廉·沃内基马克·布卢梅瑙马蒂亚斯·达勒姆珍妮弗·舒尔茨克劳斯·约瑟夫·彼得斯
Owner THYSSENKRUPP STEEL EURO AG
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