Method for producing components from lightweight steel

Patent metadata

Field	Value
Publication number	US-10214790-B2
Application number	US-201314889391-A
Country	US
Kind code	B2
Filing date	May 6, 2013
Priority date	May 6, 2013
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A method is disclosed for producing components from an austenitic lightweight steel which is metastable in its initial state, by forming of a sheet, a circuit board or a pipe in one or more steps, exhibiting a temperature-dependent TRIP and/or TWIP effect during forming. To obtain a component with, in particular, high toughness, the forming is carried out at a temperature above room temperature, at 40 to 160° C., which avoids the TRIP/TWIP effect, and to achieve in particular high component strength, the forming is carried out at a temperature below room temperature, at −65 to 0° C., which enhances the TRIP/TWIP effect.

First claim

The invention claimed is:

1. A method for producing a steel component from an austenitic lightweight steel which is metastable in its initial state and exhibits a temperature-dependent TRIP and/or TWIP effect during forming, comprising:
providing a sheet, plate or tube made of the metastable austenitic light lightweight steel;
forming the sheet, plate or tube in one or more steps in at least one of two ways, a first way in which the sheet, plate or tube is formed at a forming temperature above room temperature at 40 to 160° C. so as to avoid the TRIP-/TWIP effect, resulting in a high tenacity of the steel component, and a second way in which the forming is performed at a forming temperature below room temperature at −65-0° C., so as to enhance the TRIP-/TWIP effect resulting in a high strength of the steel component.

2. The method of claim 1 , wherein the forming is a rolling.

3. The method of claim 1 , wherein the forming is a deep drawing.

4. The method of claim 1 , wherein the forming is an internal high pressure forming (IHU).

5. The method of claim 1 , wherein the forming is performed in multiple steps, the method further comprising varying the forming temperature and/or a degree of forming and/or a forming speed between individual ones of the multiple steps.

6. The method of claim 5 , wherein in a first one of the multiple steps or in a further one of the multiple steps subsequent to the first step, the forming is performed above room temperature, and wherein in a final one of the multiple steps the forming is performed at a temperature below room temperature.

7. Components made from an austenitic, metastable lightweight steel which is metastable in its initial state and exhibits a temperature-dependent TRIP and/or TWIP effect during forming, said components being produced by
forming a sheet, plate or tube made of the metastable austenitic lightweight steel in one or more steps in at least one of two ways, a first way in which the sheet, plate or tube is formed at a forming temperature above room temperature at 40 to 160° C. so as to avoid the TRIP-/TWIP effect, resulting in a high tenacity of the steel component, and a second way in which the forming is performed at a forming temperature below room temperature at −65-0° C., so as to enhance the TRIP-/TWIP effect resulting in a high strength of the steel component, wherein the components have a metallic coating.

8. The components of claim 7 , wherein the sheet plate or tube used in the forming has a metallic coating.

Assignees

• Salzgitter Flachstahl Gmbh

Inventors

• Evertz Thomas
• Otto Manuel
• Springub Bianca
• Georgeou Zacharias

Classifications

• C22C38/04

  containing manganese · CPC title

• C22C38/06

  containing aluminium · CPC title

• C22C38/02

  containing silicon · CPC title

• C21D7/10

  of the whole cross-section, e.g. of concrete reinforcing bars · CPC title

• C21D9/0068

  for particular articles not mentioned below · CPC title