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

Patent metadata

Field	Value
Publication number	US-11214846-B2
Application number	US-201716333954-A
Country	US
Kind code	B2
Filing date	Sep 12, 2017
Priority date	Sep 16, 2016
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

The invention relates to a method for producing a component from a medium-manganese flat steel product with 4 to 12 wt % Mn, preferably more than 5 to less than 10 wt % Mn, and with TRIP/TWIP effect. In order to improve the degrees of deformation of the shaped component while at the same time reducing the forming forces, the invention proposes shaping the flat steel product into a component in a first shaping step at a temperature of the flat steel product of 60° C. to below Ac3, preferably from 60° C. to 450° C. The invention also relates to a component produced according to said method and to a use for said components.

First claim

The invention claimed is:

1. A method for producing a component, said method comprising pre-heating a medium manganese flat steel product, prior to a first deforming step, to a temperature of 60° C. to 450° C., deforming the medium manganese flat steel product having 4 to 12 wt. % Mn and 0.005 to 1.5 wt. % Mo, and having a TRIP/TWIP effect by a first deforming step at a temperature of the medium manganese flat steel product of 60° C. to 450° C., wherein prior to the first deforming step the temperature of 60° C. to 450° C. is already achieved and is not first produced by the deforming itself.

2. The method of claim 1 , wherein the medium manganese flat steel product is deformed by further deforming steps at a temperature of the flat steel product of −100° C. to below Ac3.

3. The method of claim 1 , wherein the medium manganese flat steel product is deformed by further deforming steps at a temperature of the flat steel product of room temperature to below Ac3.

4. The method of claim 1 , wherein the medium manganese flat steel product is deformed by further deforming steps at a temperature of the flat steel product of −100° C. to 60° C.

5. The method of claim 1 , wherein the medium manganese flat steel product is deformed by further individual deforming steps at different temperatures which are each locally defined.

6. The method of claim 1 , further comprising pre-heating the medium manganese flat steel product on one side.

7. The method of claim 1 , further comprising pre-heating the medium manganese flat steel product on both sides.

8. The method of claim 1 , wherein the medium manganese flat steel product is deformed by further deforming steps, and further comprising intermediately heating or intermediately cooling the flat steel product during deformation between the deforming steps to temperatures between −100° C. to below Ac3.

9. The method of claim 1 , wherein the medium manganese flat steel product is deformed by roll deforming.

10. The method of claim 1 , further comprising:
rolling a hot or cold strip rolled to form the medium manganese flat steel product;
forming the flat steel product into a tube;
longitudinal seam welding or spiral seam welding the tube; and
forming the tube by internally high-pressure.

11. The method of claim 10 , further comprising annealing the formed tube.

12. The method of claim 1 , wherein the medium manganese flat steel product comprises, in wt. %:
C: 0.0005 to 0.9,
Mn: greater than 5 to less than 10,
with the remainder being iron including unavoidable steel-associated elements.

13. The method of claim 12 , further comprising adding to the medium manganese flat steel product by alloying, in wt. %:
Al: 0 to 10,
Si: 0 to 6,
Cr: 0 to 6,
Nb: 0 to 1,
V: 0 to 1.5,
Ti: 0 to 1.5,
Mo: 0.01 to 0.6,
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.

14. The method of claim 1 , wherein the medium manganese 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.

15. The method of claim 1 , further comprising coating metallically, inorganically or organically the medium manganese 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

• C21D8/00 Primary

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• C21D8/0268

  between cold rolling steps · CPC title

• C21D2211/005

  Ferrite · CPC title

• F16L9/165

  of metal · CPC title