US 11,913,099 B2
Press hardened steel with extremely high strength and method for production
Erik James Pavlina, Lebanon, OH (US)
Assigned to Cleveland-Cliffs Steel Properties Inc., West Chester, OH (US)
Filed by AK Steel Properties, Inc., West Chester, OH (US)
Filed on Feb. 23, 2018, as Appl. No. 15/903,288.
Claims priority of provisional application 62/465,523, filed on Mar. 1, 2017.
Prior Publication US 2018/0251875 A1, Sep. 6, 2018
Int. Cl. C22C 38/38 (2006.01); C22C 38/32 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C23C 2/28 (2006.01); B32B 15/01 (2006.01); C21D 1/673 (2006.01); C23C 2/06 (2006.01); C23C 2/12 (2006.01); C22C 38/12 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C23C 2/02 (2006.01); C21D 9/46 (2006.01)
CPC C22C 38/38 (2013.01) [B32B 15/012 (2013.01); B32B 15/013 (2013.01); C21D 1/673 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/12 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/32 (2013.01); C23C 2/02 (2013.01); C23C 2/024 (2022.08); C23C 2/0224 (2022.08); C23C 2/06 (2013.01); C23C 2/12 (2013.01); C23C 2/28 (2013.01); C21D 9/46 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A press hardenable steel comprising, by weight percent, 0.22-0.25% carbon, 2.0 to 3.0% manganese, 0.2-0.3% silicon, 0.2 to 6.0% chromium, no more than 0.004% aluminum, and at least one of 0.1 to 0.6% molybdenum, 0.01 to 0.1% niobium, or 0.01 to 0.15% vanadium, the balance comprising iron and incidental impurities, wherein the ultimate tensile strength of such steel is greater than 1800 MPa, and a total elongation of such steel is at least 6%.