Method for producing a component having improved elongation at break properties

Patent metadata

Field	Value
Publication number	US-2017191142-A1
Application number	US-201715461783-A
Country	US
Kind code	A1
Filing date	Mar 17, 2017
Priority date	Dec 12, 2008
Publication date	Jul 6, 2017
Grant date	—

Abstract

The invention relates to a process for producing a component having improved elongation at break properties, in which a component is firstly produced, preferably in a hot forming or press curing process, and the component is heat treated after hot forming and/or press curing, where the heat treatment temperature T and the heat treatment time t essentially satisfy the numerical relationship T≧900· t −0.087 , where the heat treatment temperature T is in ° C. and the heat treatment time t is in seconds. The invention also relates to a component, in particular an automobile body component or the chassis of a motor vehicle, which has been produced by such a process. The invention further relates to the use of such a component as part of an automobile body or a chassis of a motor vehicle.

First claim

1 . Method for manufacturing a component for a body part or a chassis of a motor vehicle with improved elongation at break properties, in which a component is first produced by one of a hot forming and press curing process, and in which the component is tempered after the one of hot forming and press curing processes characterised in that a tempering temperature T and a tempering time t substantially satisfy the numerical relationship T≧900· t −0.087 , wherein the tempering temperature T is expressed in ° C. and the tempering time t in seconds and wherein the tempering temperature is at least 500° C. and lower than AC 1 temperature.

2 . Method according to claim 1 ,
characterised in that the tempering time at a tempering temperature of approximately 500° C. is at least 20 minutes, at a tempering temperature of approximately 550° C. at least 5 minutes, and at a tempering temperature of approximately 600° C. at least 3 minutes.

3 . Method according to claim 1 ,
characterised in that the tempering temperature is at least 500° C. and the tempering time is selected to be high enough that the elongation at break value A80 of the component is increased by approximately 15%.

4 . Method according to claim 1 ,
characterised in that the component substantially consists of a manganese-boron steel.

5 . Method according to claim 1 ,
characterised in that the component is coated or uncoated.

6 . Method according to claim 1 ,
characterised in that prior to tempering, the component is coated with an inorganic, an organic and/or an inorganic-organic coating.

7 . Method according to claim 1 ,
characterised in that the component is coated with a corrosion protection coating.

8 . Method according to claim 1 ,
characterised in that prior to tempering, the component is coated electrolytically and/or by hot-dip processing.

9 . Method according to claim 1 ,
characterized in that the tempering temperature T is lower than 700° C.

10 . Method according to claim 1 ,
characterized in that the tempering temperature is at least 500° C. and the tempering time is selected to be high enough that the elongation at break value A80 of the component is increased by approximately 20%.

11 . Method according to claim 1 ,
characterized in that the tempering temperature is at least 500° C. and the tempering time is selected to be high enough that the elongation at break value A80 of the component is increased by approximately 25%.

12 . Method according to claim 1 ,
characterized in that the tempering temperature is at least 550° C. and the tempering time is selected to be high enough that the elongation at break value A80 of the component is increased by approximately 15%.

13 . Method according to claim 1 ,
characterized in that the tempering temperature is at least 550° C. and the tempering time is selected to be high enough that the elongation at break value A80 of the component is increased by approximately 20%.

14 . Method according to claim 1 ,
characterized in that the tempering temperature is at least 550° C. and the tempering time is selected to be high enough that the elongation at break value A80 of the component is increased by approximately 25%.

15 . Method according to claim 1 ,
characterized in that the tempering temperature is at least 600° C. and the tempering time is selected to be high enough that the elongation at break value A80 of the component is increased by approximately 15%.

16 . Method according to claim 1 ,
characterized in that the tempering temperature is at least 600° C. and the tempering time is selected to be high enough that the elongation at break value A80 of the component is increased by approximately 20%.

17 . Method according to claim 1 ,
characterized in that the tempering temperature is at least 600° C. and the tempering time is selected to be high enough that the elongation at break value A80 of the component is increased by approximately 25%.

18 . Method according to claim 1 ,
characterized in that the component substantially consists of a manganese-boron tempering steel.

19 . Method according to claim 1 ,
characterized in that the component substantially consists of 22MnB5 tempering steel.

Assignees

• Lenze Franz-Josef
• Sikora Sascha
• Banik Janko
• Thyssenkrupp Steel Europe Ag

Inventors

• Lenze Franz-Josef
• Sikora Sascha
• Banik Janko

Classifications

• C21D8/00

  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

• C21D8/005

  Chemistry & Metallurgy · mapped topic

• C23C22/78

  Pretreatment of the material to be coated · CPC title

• C21D1/673

  for die quenching · CPC title

• C21D9/52 Primary

  for wires; for strips {; for rods of unlimited length} · CPC title