Claims
- 1. A hot rolled steel strip having the following weight composition:carbon: 0.12-0.25% manganese: 1-2%, aluminum: 0.03-2.5%, silicon: 0.03-less than 0.5%, chromium: 0.04-2% phosphorus: 0.02-0.09%, sulfur: optionally up to 0.01%, titanium: up to 0.15%, niobium: up to 0.15%, vanadium: up to 0.15%, the balance iron and residual impurities, wherein the microstructure of said steel strip comprises three phases, 40-70% ferrite, greater than 5% residual austenite, and bainite.
- 2. The steel strip according to claim 1, wherein said steel strip has a thickness of between 1.4 mm and 6 mm.
- 3. The steel strip according to claim 1, wherein phosphorus: 0.048-0.09%.
- 4. The steel strip according to claim 1, wherein silicon: 0.03-0.25%.
- 5. The steel strip according to claim 1, wherein aluminum: 1.33-2.5%.
- 6. A hot rolled steel strip having the following weight composition:carbon: 0.12-0.25% manganese: 1-2%, aluminum: 1.33-2.5%, silicon: 0.03-2%, chromium: 0.04-2% phosphorus: 0.02-0.09%, sulfur: optionally up to 0.01%, titanium: up to 0.15%, niobium: up to 0.15%, vanadium: up to 0.15%, the balance iron and residual impurities, wherein the microstructure of said steel strip comprises three phases, 40-70% ferrite, greater than 5% residual austenite, and bainite.
- 7. The steel strip according to claim 6, wherein said steel strip has a weight composition of less than 0.5% of silicon.
- 8. The steel strip according to claim 6, wherein said steel strip has a thickness of between 1.4 mm and 6 mm.
- 9. The steel strip according to claim 6, wherein phosphorus: 0.048-0.09%.
- 10. The steel strip according to claim 6, wherein silicon: 0.03-0.25%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
99 14187 |
Nov 1999 |
FR |
|
Parent Case Info
This application is a divisional of Ser. No. 09/709,482 filed on Nov. 13, 2000, now U.S. Pat. No. 6,475, 308 issued Nov. 5, 2002.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4502897 |
Morita et al. |
Mar 1985 |
A |
5041167 |
Miwa |
Aug 1991 |
A |
6280538 |
Soshiroda et al. |
Aug 2001 |
B1 |
6328826 |
Iung et al. |
Dec 2001 |
B1 |
Foreign Referenced Citations (7)
Number |
Date |
Country |
0 298 500 |
Dec 1988 |
EP |
0 548 950 |
Jun 1993 |
EP |
0 586 704 |
Mar 1994 |
EP |
0 748 877 |
Dec 1996 |
EP |
58-167751 |
Oct 1983 |
JP |
3-10049 |
Jan 1991 |
JP |
10-195591 |
Jul 1998 |
JP |