STEEL FOR HIGH-STRENGTH COMPONENTS MADE OF BANDS, SHEETS OR TUBES HAVING EXCELLENT FORMABILITY AND PARTICULAR SUITABILITY FOR HIGH-TEMPERATURE COATING PROCESSES

• US 20110024006A1
• Filed: 11/05/2008
• Published: 02/03/2011
• Est. Priority Date: 12/03/2007
• Status: Abandoned Application

• Current Assignee: Salzgitter Flachstahl GmbH (Salzgitter AG)
• Original Assignee: Salzgitter Flachstahl GmbH (Salzgitter AG)
• Inventors: Schötter, Joachim, Flaxa, Volker
• Application Number:
  US12/745,798
• Publication Number:
  US 20110024006A1
• Time in Patent Office: Days
• US Class Current: 148/648
• CPC Class Codes: C22C 38/22 with molybdenum or tungsten
• CPC Class Codes: C22C 38/24 with vanadium
• CPC Class Codes: C22C 38/32 with boron
• CPC Class Codes: C22C 38/38 with more than 1.5% by weight of manganese

Abstract

A steel for high-strength components including bands, sheets or pipes having excellent formability and particular suitability for high-temperature coating processes above Ac₃ (about 900° C.) is disclosed. The steel includes the following elements (contents in % by mass): C 0.07 to ≦0.15, Al≦0.05, Si≦0.80, Mn 1.60 to ≦2.10, P≦0.020, S≦0.010, Cr 0.50 to ≦1.0, Mo 0.10 to ≦0.30, Ti_min 48/14×[N], V 0.03 to ≦0.12, B 0.0015 to ≦0.0050, with the balance iron including usual steel-accompanying elements.

Claims

1-13. -13. (canceled)

14. A steel for high-strength components of bands, sheets or pipes, comprising by mass percent:

15. The steel of claim 14, having a C-content of 0.08 to ≦

0.10%.

16. The steel of claim 14, having a Si-content of ≦

0.30%.

17. The steel of claim 14, having a Mn-content of 1.80 to ≦

2.0%.

18. The steel of claim 14, having a Cr-content of 0.70 to ≦

0.80%.

19. The steel of claim 14, having a Mo-content of 0.15 to ≦

0.25%.

20. The steel of claim 14, having a Ti-content of 0.02 to ≦

0.03%.

21. The steel of claim 14, having a V-content of 0.05 to ≦

0.10%.

22. The steel of claim 14, having a B-content of 0.0025 to ≦

0.0035%.

23. The steel of claim 14 for application in a high-temperature coating process above Ac₃ (about 900°

C.).

24. A component formed from a readily formable band, sheet or tube made of a steel comprising, in mass percent:

25. The component of claim 24, wherein the heat treatment includes enameling with one or more firings.

26. The component of claim 24, wherein the heat treatment includes a metallic coating.

27. The component of claim 26, wherein the coating is a zinc-plating.

28. A method of making a component, comprising the steps of:

forming a structure selected from the group consisting of band, sheet, and tube into a shape;

heat-treating the structure at a temperature above Ac₃ (about 900°

C.); and

allowing the structure to cool down to produce a component with a minimum yield strength of 450 MPa.