Steel material and method for its manufacture

Patent metadata

Field	Value
Publication number	US-12435381-B2
Application number	US-202118037150-A
Country	US
Kind code	B2
Filing date	Nov 18, 2021
Priority date	Nov 19, 2020
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

The method relates to a press-hardened component with a tensile strength R m >1600 MPa, in particular >1800 MPa, and especially >2000 MPa, wherein the component is manufactured from a steel material, wherein the steel material is a boron-manganese steel, which has a carbon content >0.30 mass %, wherein the steel material is hot rolled or hot rolled and cold rolled to a strip with a thickness of 0.5 to 3 mm, wherein the strip has a thin coating of zinc or a zinc-based alloy and a coating weight of <50 g/m 2 on each strip side of the steel strip.

First claim

The invention claimed is:

1. A press hardened component with a tensile strength R m >1600 MPa, wherein the component is manufactured from a steel material, wherein the steel material is a boron-manganese steel, which has a carbon content >0.30 mass %, wherein the steel material is (a) hot rolled or (b) hot rolled and cold rolled to a strip with a thickness of 0.5 to 3 mm, wherein the strip has a coating of zinc or a zinc alloy directly applied to the steel material at a coating weight of <50 g/m 2 on each side of the strip.

2. The press hardened component of claim 1 , wherein the steel material has the following alloy composition (in mass %):
carbon (C) 0.30-0.60
manganese (Mn) 0.5-3.0
aluminum (Al) 0.01-0.30
silicon (Si) 0.01-0.5
chromium (Cr) 0.01-1.0
titanium (Ti) 0.01-0.08
niobium (Nb) 0.001-0.06
nitrogen (N)<0.02
boron (B) 0.002-0.02
phosphorus (P)<0.015
sulfur(S)<0.010
molybdenum (Mo)<1
residual iron and smelting-related impurities.

3. The press hardened component of claim 1 , wherein the steel material has the following alloy composition (in mass %):
carbon (C) 0.32-0.38
manganese (Mn) 0.8-1.5
aluminum (Al) 0.025-0.20
silicon (Si) 0.01-0.5
chromium (Cr) 0.01-0.25
titanium (Ti) 0.025-0.08
niobium (Nb) 0.001-0.06
nitrogen (N)<0.006
boron (B) 0.002-0.008
phosphorus (P)<0.012
sulfur(S)<0.002
molybdenum (Mo)<1
residual iron and smelting-related impurities.

4. The press hardened component of claim 1 , wherein the steel material fulfills the following condition (in mass %)
( Al -0.02)/(15.4* N )+ Ti /(3.25* N )+ Nb /(13.3* N )>=1.

5. The press hardened component of claim 1 , wherein the coating weight is >20 g/m 2 , on each side of the steel strip.

6. The press-hardened component of claim 1 , wherein the tensile strength Rm is greater than 1800 MPa.

7. The press-hardened component of claim 1 , wherein the tensile strength Rm is greater than 2000 MPa.

8. The press-hardened component of claim 1 , wherein the coating comprises a zinc-alloy having an iron content of 8 to 18 mass percent iron.

9. The press-hardened component of claim 1 , wherein the coating weight is less than 40 g/m 2 on each side of the strip.

10. A press hardened component with a tensile strength R m >1600 MPa, comprising a steel material having an alloy composition that includes, in mass %:
carbon (C) 0.30-0.60
manganese (Mn) 0.5-3.0
aluminum (Al) 0.01-0.30
silicon (Si) 0.01-0.5
chromium (Cr) 0.01-1.0
titanium (Ti) 0.01-0.08
niobium (Nb) 0.001-0.06
nitrogen (N)<0.02
boron (B) 0.002-0.02
phosphorus (P)<0.015
sulfur(S)<0.010
molybdenum (Mo) <1
residual iron and smelting-related impurities;
wherein the steel material is (a) hot rolled or (b) hot rolled and cold rolled, to a strip with a thickness of 0.5 to 3 mm, wherein the strip has a coating of zinc or a zinc alloy directly applied to the steel material and having a coating weight of <50 g/m 2 and a thickness of less than 7 microns on each side of the steel strip.

11. The press hardened component of claim 10 , wherein the steel material fulfills the following condition (in mass %)
( Al -0.02)/(15.4* N )+ Ti /(3.25* N )+ Nb /(13.3* N )>=1.

12. The press-hardened component of claim 10 , wherein the tensile strength Rm is greater than 1800 MPa.

13. The press-hardened component of claim 10 , wherein the tensile strength Rm is greater than 2000 MPa.

14. The press-hardened component of claim 10 , wherein the coating comprises a zinc-alloy having an iron content of 8 to 18 mass percent iron.

15. The press-hardened component of claim 10 , wherein the coating weight is less than 40 g/m 2 on each side of the strip.

16. A press hardened component with a tensile strength R m >1600 MPa, comprising a steel material having an alloy composition that includes, in mass %:
carbon (C) 0.32-0.38
manganese (Mn) 0.8-1.5
aluminum (Al) 0.025-0.20
silicon (Si) 0.01-0.5
chromium (Cr) 0.01-0.25
titanium (Ti) 0.025-0.08
niobium (Nb) 0.001-0.06
nitrogen (N)<0.006
boron (B) 0.002-0.008
phosphorus (P)<0.012
sulfur(S)<0.002
molybdenum (Mo) <1
residual iron and smelting-related impurities;
wherein the steel material is (a) hot rolled or (b) hot rolled and cold rolled, to a strip with a thickness of 0.5 to 3 mm, wherein the strip has a coating of zinc or a zinc alloy including at least 75 mass % zinc directly applied to the steel material at a coating weight of <50 g/m 2 on each side of the steel strip.

17. The press hardened component of claim 16 , wherein the steel material fulfills the following condition (in mass %)
( Al -0.02)/(15.4* N )+ Ti /(3.25* N )+ Nb /(13.3* N )>=1.

18. The press-hardened component of claim 16 , wherein the tensile strength Rm is greater than 1800 MPa.

19. The press-hardened component of claim 16 , wherein the tensile strength Rm is greater than 2000 MPa.

20. The press-hardened component of claim 16 , wherein the coating comprises a zinc-alloy having an iron content of 8 to 18 mass percent iron.

21. The press-hardened component of claim 16 , wherein the coating weight is less than 40 g/m 2 on each side of the strip.

Assignees

• Voestalpine Stahl Gmbh

Inventors

• Gerstner Florian
• Sommer Andreas
• Kolnberger Siegfried
• Kurz Thomas

Classifications

• C25D3/22

  of zinc · CPC title

• C23C2/40

  Plates; Strips · CPC title

• C23C2/06

  Zinc or cadmium or alloys based thereon · CPC title

• C22C38/32

  with boron · CPC title

• C22C38/28

  with titanium or zirconium · CPC title