Method for producing a re-shaped component from a manganese-containing flat steel product and such a component

Patent metadata

Field	Value
Publication number	US-11519050-B2
Application number	US-201716333934-A
Country	US
Kind code	B2
Filing date	Aug 16, 2017
Priority date	Sep 16, 2016
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

The invention relates to a method for producing a component from a medium manganese flat steel product having 4 to less than 10 wt. % Mn, 0.0005 to 0.9 wt. % C, 0.02 to 10 wt. % Al, the remainder iron, including unavoidable steel-accompanying elements, and having a TRIP effect at room temperature. In order to produce a component, which is distinguished by very high strengths and an increased residual strain and re-shaping capacity, the flat steel product, according to the invention, is re-shaped by at least one re-shaping step to form a component and, before and/or during and/or after the at least one re-shaping step, the flat steel product is cooled down to a temperature of the flat steel product of less than room temperature to −196° C. The invention further relates to a component produced by this method and to a use for said components.

First claim

What is claimed is:

1. A method for producing a component starting from a medium manganese flat steel product comprising 4 to less than 10 wt. % Mn, 0.0005 to 0.9 wt. % C, 0.02 to 10 wt. % Al, with the remainder being iron including unavoidable steel-associated elements and with a TRIP effect at room temperature, wherein the flat steel product is produced with a microstructure which has an austenite content of 10 to 80%, 20 to 90% martensite, ferrite and bainite, wherein at least 30% of the martensite is present as annealed martensite, said method comprising, the following steps to form the component: pre-heating the flat steel product without deformation to a temperature of 60° C. to 450° C.;
deforming the pre-heated flat steel product by at least one deforming step at a temperature of the flat steel product of 60° C. to 450° C.; and
cooling the deformed flat steel product prior to at least one final deforming step at a temperature of 0° C. to −196° C.

2. The method of claim 1 , comprising an additional step of further deforming the cooled steel flat product by one or a plurality of final deforming steps at a temperature of 0° C. to −196° C.

3. The method of claim 1 , further comprising pre-heating and/or cooling one side of the flat steel product.

4. The method of claim 1 , further comprising pre-heating and/or cooling both sides of the flat steel product.

5. The method of claim 1 , further comprising intermediately heating or intermediately cooling the flat steel product during deformation between deformation steps to temperatures, which are selected for the respective deforming steps, between −196° C. to below Ac3.

6. The method of claim 1 , wherein the flat steel product is deformed by roil deforming.

7. The method of claim 1 , further comprising:
forming the flat steel product into a tube; and
longitudinal seam welding or spiral seam welding the tube; and
forming the tube by internally high-pressure.

8. The method of claim 7 , further comprising annealing the formed tube.

9. The method of claim 1 , further comprising adding to the flat steel product by alloying, in wt. %:
Si: 0 to 6,
Cr: 0 to 6,
Nb: 0 to 1,
V: 0 to 1.5,
Ti: 0 to 1.5,
Mo: 0 to 3,
Sn: 0 to 0.5,
Cu: 0 to 3,
W: 0 to 5,
Co: 0 to 8,
Zr: 0 to 0.5,
Ta: 0 to 0.5,
Te: 0 to 0.5,
B: 0 to 0.15,
P: less than 0,1,
S: less than 0.1,
N: less than 0.1.

10. The method of claim 1 , further comprising coating metallically, inorganically or organically the flat steel product or the component.

Assignees

• Salzgitter Flachstahl Gmbh

Inventors

• Palzer Peter
• Evertz Thomas
• Otto Manuel
• Köhler Kai

Classifications

• C21D8/10

  during manufacturing of tubular bodies · CPC title

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• C22C38/20

  with copper · CPC title

• C22C38/001

  containing N · CPC title

• F16L9/02

  of metal (F16L9/16 - F16L9/22 take precedence) · CPC title