Use of a sulphate, and method for producing a steel component by forming in a forming machine

Patent metadata

Field	Value
Publication number	US-10072229-B2
Application number	US-201515509524-A
Country	US
Kind code	B2
Filing date	Aug 19, 2015
Priority date	Sep 11, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

Coating materials with minimized lubricant demand enable optimized tribological conditions in forming flat steel products and are also unobjectionable in relation to their effects on the environment. With such coating materials, steel components can be produced by forming flat steel products in forming machines. For example, a tribologically-active layer may be produced on at least one surface of a flat steel product or a forming machine used to form the flat steel product, wherein the at least one surface comes into contact with the opposing component during forming. The tribologically-active layer may be formed by coating the at least one surface with a coating material from a group consisting of aluminum sulfate, ammonium sulfate, iron sulfate, and magnesium sulfate. The flat steel product may be inserted into the forming machine to be formed into the steel component.

First claim

What is claimed is:

1. A flat steel product configured to be formed by a forming machine, the flat steel product comprising a coating material, the coating material consisting of:
water as a solvent; and
a sulfate selected from a group consisting of aluminum sulfate, ammonium sulfate, iron sulfate, and magnesium sulfate;
wherein the coating material improves a tribological characteristic of the flat steel product relative to a tribological characteristic of a flat steel product without the coating material.

2. The flat steel product of claim 1 wherein the group consists of aluminum(III) sulfate, ammonium sulfate, iron(III) sulfate, iron(II) sulfate, and magnesium sulfate.

3. The flat steel product of claim 1 wherein the coating material forms a water-soluble layer.

4. A forming machine for forming a flat steel product, the forming machine comprising a coating material, the coating material consisting of:
water, as a solvent; and
a sulfate selected from a group consisting of aluminum sulfate, ammonium sulfate, iron sulfate, and magnesium sulfate
wherein the coating material improves a tribological characteristic of the forming machine relative to a tribological characteristic of a forming machine without the coating material.

5. The forming machine of claim 4 wherein the group consists of aluminum(III) sulfate, ammonium sulfate, iron(III) sulfate, iron(II) sulfate, and magnesium sulfate.

6. The forming machine of claim 4 wherein the coating material forms a water-soluble layer.

7. A method of producing a steel component by forming a flat steel product in a forming machine, the method comprising:
providing the flat steel product;
producing a tribologically-active layer on at least one surface of the flat steel product or of the forming machine by coating the at least one surface with a coating material consisting of water, as a solvent; and a sulfate selected from a group consisting of aluminum sulfate, ammonium sulfate, iron sulfate, and magnesium sulfate;
inserting the flat steel product into the forming tool; and
forming the flat steel product to create the steel component, wherein during forming
the at least one surface of the flat steel product comes into contact with the forming machine, or
the at least one surface of the forming machine comes into contact with the flat steel product.

8. The method of claim 7 wherein the group consists of aluminum(III) sulfate, ammonium sulfate, iron(II) sulfate, iron(III) sulfate, and magnesium sulfate.

9. The method of claim 7 wherein the forming of the flat steel product is performed as cold forming of the flat steel product.

10. The method of claim 7 wherein the tribologically-active layer is produced on the flat steel product.

11. The method of claim 10 wherein the tribologically-active layer produced on the flat steel product is applied with a coatweight of 5-50 mg/m 2 .

12. The method of claim 10 wherein a coefficient of friction of the at least one surface of the flat steel product after the tribologically-active layer is produced is not more than 0.15.

13. The method of claim 7 wherein the first component is distilled water as the solvent.

14. The method of claim 7 wherein an amount of the tribologically-active constituent in the aqueous solution is 0.2-1 mol/l based on a SO 4 2− ion concentration.

15. The method of claim 7 wherein the flat steel product includes a anticorrosion control coat, wherein the tribologically-active layer is produced on the anticorrosion control coat.

Assignees

• Thyssenkrupp Steel Europe Ag
• Thyssenkrupp Ag

Inventors

• Lostak Thomas
• Timma Christian

Classifications

• C10N2040/243

  Cold working · CPC title

• C10N2040/24

  without essential removal of material {, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding}; Punching metal · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2050/08

  Solids · CPC title

• C10N2030/12

  Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives · CPC title