HIGH STRENGTH, AIR-HARDENING STEEL WITH EXCELLENT SHAPING PROPERTIES

• US 20090173412A1
• Filed: 11/03/2005
• Published: 07/09/2009
• Est. Priority Date: 11/03/2004
• Status: Abandoned Application

• Current Assignee: Salzgitter Flachstahl GmbH (Salzgitter AG)
• Original Assignee: Salzgitter Flachstahl GmbH (Salzgitter AG)
• Inventors: Koch, Thomas, Peters, Bernd-Michael, Schöttler, Joachim, Flaxa, Volker
• Application Number:
  US11/718,573
• Publication Number:
  US 20090173412A1
• Time in Patent Office: Days
• US Class Current: 148/330
• CPC Class Codes: C22C 38/02 containing silicon
• CPC Class Codes: C22C 38/04 containing manganese
• CPC Class Codes: C22C 38/22 with molybdenum or tungsten
• CPC Class Codes: C22C 38/24 with vanadium
• CPC Class Codes: C22C 38/38 with more than 1.5% by weight of manganese

Abstract

The invention relates to a high strength, air-hardening, temper-resistant steel, which can easily be welded and galvanized and exhibits excellent shaping properties, particularly for the construction of lightweight vehicles. The inventive steel comprises the following elements (contents in mass %): C0.07 to ≦0.15, Al≦0.05, Si 0.15 to ≦0.30, Mn 1.60 to ≦2.10, P≦0.020, S≦0.010, N 0.0030 to ≦0.0150, Cr 0.50 to ≦1.0, Mo 0.30 to ≦0.60, Ti 0.010 to ≦0.050, V 0.12 to ≦0.20, B 0.0015 to ≦0.0040, remainder iron including incidental steel-accompanying elements.

Claims

1. A high strength, air-hardening, temper-resistant steel suitable for welding and galvanizing, comprising the elements (contents in mass-%):

C 0.07 to ≦

0.15 Al ≦

0.05 Si 0.15 to ≦

0.30 Mn 1.60 to ≦

2.10 P ≦

0.020 S ≦

0.010 N 0.0030 to ≦

0.0150 Cr 0.50 to ≦

1.0 Mo 0.30 to ≦

0.60 Ti 0.010 to ≦

0.050 V 0.12 to ≦

0.20 B 0.0015 to ≦

0.0040,

remainder iron including incidental steel-accompanying elements.

2. The steel of claim 1, wherein the steel has a C content of 0.08 to ≦

0.10%.

3. The steel of claim 1, wherein the steel has a Si content of 0.20 to ≦

0.30%.

4. The steel of claim 1, wherein the steel has a Mn content of 1.80 to ≦

2.0%.

5. The steel of claim 1, wherein the steel has a N content of 0.0030 to ≦

0.0125%.

6. The steel of claim 5, wherein the steel has a N content of 0.0030 to ≦

0.00805%.

7. The steel of claim 1, wherein the steel has Cr content of 0.70 to ≦

0.80%.

8. The steel of claim 1, wherein the steel has a Mo content of 0.40 to ≦

0.50%.

9. The steel of claim 1, wherein the steel has a Ti content of 0.02 to ≦

0.03%.

10. The steel of claim 1, wherein the steel has a V content of 0.13 to ≦

0.17%.

11. The steel of claim 1, wherein the steel has a B content of 0.0025 to ≦

0.0035%.