Sheet metal component, produced by hot working flat steel product, and method for production thereof

A metal plate, thermoforming technology, applied in the direction of metal material coating process, furnace type, heat treatment furnace, etc.

Active Publication Date: 2020-03-31
THYSSENKRUPP STEEL EURO AG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem here is that, due to the high austenitization temperature, it is not possible to cathodically protect the plate by a metal anti-corrosion coating

Method used

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  • Sheet metal component, produced by hot working flat steel product, and method for production thereof
  • Sheet metal component, produced by hot working flat steel product, and method for production thereof
  • Sheet metal component, produced by hot working flat steel product, and method for production thereof

Examples

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Embodiment Construction

[0071] The present invention will be described in more detail below based on examples.

[0072] Three melts S1-S3 corresponding to the requirements of the present invention and one comparative melt V were melted, the composition of which is given in Table 1 in % by weight. Table 1 also lists the Ac1 and Ac3 temperatures in °C for steels S1-S3 and V according to SEP 1680:1990-12.

[0073] Comparative melt V was excluded from the specification of the invention due to its too low Mn content and the presence of B.

[0074] Sheet metal cut-outs are made of S1-S3 and V steel.

[0075] In Examples 1, 4, 11 and 8, samples of sheet metal cut from hot-rolled strip hot-rolled to thickness "d" (condition "WW" ), followed by annealing under the hood (state "HG") or in a continuous furnace (state "DO"). In Examples 2 and 5, sheet metal samples were cut from strips made from hot rolled strip, which were further cold rolled to thickness "d" (condition "KW"). Some cold-rolled strips were p...

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PUM

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Abstract

The invention relates to a sheet metal component and a method for producing sheet metal components of this type, which enables an energy saving in comparison with conventionally produced sheet metal components due to lower shaping temperatures, allows for an increased residual stress at high strengths, and whereby a highest possible potential is maintained for cathodic corrosion protection. The sheet metal component according to the invention consists of (in wt.%) C: up to 0.5 %, Si: 0.05 - 1 %, Mn: 4 - 12 %, Cr: 0.1 - 4 %, AI: up to 3.5 %, N: up to 0.05 %, P: up to 0.05 %, S: up to 0.01 %, Cu, Ni: in total up to 2 %, Ti, Nb, V: in total up to 0.5 %, rare-earth elements: up to 0.1 %, and the rest being Fe and unavoidable impurities, wherein the C content %C and the Cr content %Cr fulfils the following condition: (10 * %C) + %Cr < 5.5 %. According to the invention, in order to produce a sheet metal component, the flat steel product is heated through to a heating temperature of at least200 degrees centigrade and at most 800 degrees centigrade, and subsequently shaped to form the component by hot working the flat steel product heated to the heating temperature, wherein the structureof the hot-worked sheet metal component consists of 5 - 50 vol.% austenite and the rest being martensite, tempered martensite or ferrite, wherein the ferrite-portion can also be 0, and wherein the average grain diameter of the grains of the structure is less than 5 pm.

Description

technical field [0001] The invention relates to a sheet metal component produced by hot forming a flat steel product. [0002] Furthermore, the invention relates to a method for producing the component according to the invention. [0003] If information is given here about the alloy content of the individual elements in the steel according to the invention, it is always relative to weight (expressed in % by weight) unless otherwise stated. [0004] In contrast, data on the structural composition of steel, flat steel products or components formed therefrom are always volume-dependent (expressed in vol. %). If mentioned, here, the proportion of austenite is measured by X-ray diffraction (XRD) with iron-filtered Co-Kα rays. The X-ray diffraction measurement method is described in the following sources: DIN EN 13925 - X-ray diffraction of polycrystalline and amorphous materials, Parts 1 and 2 of the 2003_7 edition, Part 3 of the 2005 edition. If mentioned, other structural comp...

Claims

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Application Information

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IPC IPC(8): B21D22/02C23C2/06C23C2/12C21D9/46C22C38/00C22C38/02C22C38/06C22C38/20C22C38/24C22C38/26C22C38/28C22C38/38C22C38/58C21D7/13C21D6/00C21D8/04C23C2/02
CPCB21D22/022C21D6/005C23C2/02C23C2/06C23C2/12C21D9/46C22C38/001C22C38/005C22C38/02C22C38/06C22C38/20C22C38/24C22C38/26C22C38/28C22C38/38C22C38/58C21D2211/001C21D2211/005C21D2211/008C23C2/28C21D8/0205C21D8/0226C21D1/185C23C2/0224C22C38/42
Inventor 布里吉特·哈默哈拉尔德·霍夫曼托马斯·黑勒塞巴斯蒂安·施蒂勒格奥尔格·帕尔马扬科·巴尼克约纳斯·施瓦贝
Owner THYSSENKRUPP STEEL EURO AG
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