| (19) |
 |
|
(11) |
EP 2 886 675 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
05.08.2015 Bulletin 2015/32 |
| (43) |
Date of publication A2: |
|
24.06.2015 Bulletin 2015/26 |
| (22) |
Date of filing: 19.12.2014 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
NO PL PT RO RS SE SI SK SM TR |
|
Designated Extension States: |
|
BA ME |
| (30) |
Priority: |
20.12.2013 US 201361919081 P
|
| (71) |
Applicant: CRS Holdings, Inc. |
|
Wilmington DE 19801 (US) |
|
| (72) |
Inventor: |
|
- Novotny, Paul M.
Mohnton, Pennsylvania 19540 (US)
|
| (74) |
Representative: Gill, Stephen Charles et al |
|
Mewburn Ellis LLP
City Tower
40 Basinghall Street
London EC2V 5DE
City Tower
40 Basinghall Street
London EC2V 5DE (GB) |
|
| |
|
| (54) |
High strength steel alloy and strip and sheet product made therefrom |
(57) An alloy is disclosed that provides a unique combination of very high strength, toughness,
and ductility. The alloy can be characterized by the following weight percent composition.
| C |
0.3-0.6 |
| Mn |
3.0-4.5 |
| Si |
1.0-2.0 |
| Cr |
0.6-2.5 |
| Ni |
0.6-2.5 |
| Mo+½W |
Up to 0.5 |
| Cu |
0.3-1.0 |
| Co |
0.01 max. |
| V+5/9Nb |
0.1-0.5 |
| Ti |
0.025 max. |
| Al |
0.025 max. |
| Ca |
0.005 max. |
| N |
0.02 max. |
The balance is iron and the usual impurities, wherein the impurities include not more
than about 0.03% phosphorus and not more than about 0.003% sulfur. The alloy is further
defined by containing Si, Cu, V, and optionally Nb such that 2 ≤ (%Si + %Cu)/(%V+(5/9)
x %Nb)≤ 34.