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Method for producing an easily deformable flat steel product, flat steel product, and method for producing a component from such a flat steel product

A formability, flat steel technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as the impact of mechanical material properties, and achieve the effect of preventing material cracks

Active Publication Date: 2012-08-29
THYSSENKRUPP STEEL EURO AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Decarburization is generally understood to negatively affect mechanical material properties required for practical applications

Method used

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  • Method for producing an easily deformable flat steel product, flat steel product, and method for producing a component from such a flat steel product
  • Method for producing an easily deformable flat steel product, flat steel product, and method for producing a component from such a flat steel product
  • Method for producing an easily deformable flat steel product, flat steel product, and method for producing a component from such a flat steel product

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Experimental program
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Embodiment Construction

[0062] In order to examine the effect achieved by the method according to the invention, hard-rolled cold-rolled strip test pieces were used, each of the multiphase steel "MP" and of the steel "WU" usually used for hot forming. The compositions of steels MP and WU are given in Table 1.

[0063]

[0064] The rest of the iron and unavoidable impurities.

[0065] Table 1

[0066] Two test pieces each made of the steels MP and WU were annealed according to the invention in a through-flow furnace for edge layer decarburization. The annealing parameters used here are given in Table 2, column "Invention" below.

[0067] For comparison, two other test pieces made of steels MP and WU were conventionally annealed in a continuous furnace, by conventional annealing, which refers to the pretreatment usually performed for hot-dip galvanizing.

[0068] In order to optimize the mechanical properties of the test pieces, an overaging treatment was additionally carried out. This overaging...

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Abstract

The invention relates to a method by means of which an easily deformable flat steel product having a carbon content of 0.1-0.4 wt % can be produced in a cost-effective manner. To this end, according to the invention, an annealing treatment is carried out under an annealing atmosphere comprising 0.1-25 vol % of H2, H2O, with the remainder being N2 and technically unavoidable impurities, and having a dew point of between -20 DEG C and +60 DEG C, wherein the ratio of H2O / H2 of the annealing atmosphere is no greater than 0.957.; The flat steel product is thereby heated to a holding temperature of 600-1100 DEG C in the course of the annealing treatment, at which it is held for a holding time of 10-360 s, so that the flat steel product obtained after the annealing treatment comprises a 10-200 [mu]m thick ductile edge layer (R) adjacent to the free surface thereof, having a ductility that is greater than the interior core layer (K) of the flat steel product covered by the edge layer. The invention further relates to a correspondingly produced flat steel product particularly suitable for hot or cold forming, and to a method for producing components made of such a flat steel product.

Description

technical field [0001] The invention relates to a method for producing flat steel products with good formability and a carbon content of 0.1-0.4% by weight, wherein the flat steel products are annealed in a continuous-through furnace. [0002] The invention also relates to a correspondingly produced flat steel product and a method for producing a component made of such a flat steel product. Background technique [0003] The flat steel products mentioned here are mainly used in particular for the manufacture of body and chassis components of motor vehicles. Therefore, there are high requirements for the formability of flat steel products. Formability refers to cold forming and hot forming capabilities. [0004] A particular difficulty lies in the hot forming of galvanized flat steel products into high-strength or super-strength steel components. For such steel components, protective layers based on zinc or zinc alloys generally ensure adequate cathodic corrosion protection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/76C21D3/04C21D8/02C22C38/02C22C38/04C22C38/32C21D7/02C21D7/13
CPCC21D1/76C21D8/0257C21D9/46C22C38/02C22C38/04C22C38/06C22C38/28C22C38/38B21D31/00C21D1/26
Inventor 威廉·沃内基曼弗雷德·莫伊雷尔延斯·孔德拉蒂乌克马克·布卢梅瑙马丁·诺登蒂埃莫·武特克
Owner THYSSENKRUPP STEEL EURO AG
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