US 12,110,570 B2
Cold rolled, coated and post batch annealed steel sheet
Hyun Jo Jun, Clinton, NJ (US)
Assigned to ArcelorMittal, Luxembourg (LU)
Filed by ArcelorMittal, Luxembourg (LU)
Filed on Apr. 18, 2023, as Appl. No. 18/135,962.
Application 18/135,962 is a division of application No. 17/083,451, filed on Oct. 29, 2020, granted, now 11,661,637.
Application 17/083,451 is a continuation of application No. 15/552,485, abandoned, previously published as PCT/US2016/019428, filed on Feb. 24, 2016.
Claims priority of provisional application 62/120,426, filed on Feb. 25, 2015.
Prior Publication US 2023/0257846 A1, Aug. 17, 2023
Int. Cl. C21D 9/46 (2006.01); B32B 15/01 (2006.01); C21D 1/20 (2006.01); C21D 1/25 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/26 (2006.01); C22C 38/38 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01)
CPC C21D 9/46 (2013.01) [B32B 15/013 (2013.01); C21D 1/20 (2013.01); C21D 1/25 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0247 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/26 (2013.01); C22C 38/38 (2013.01); C23C 2/02 (2013.01); C23C 2/022 (2022.08); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C23C 2/29 (2022.08); C23C 2/40 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A cold rolled, coated, annealed and post tempered steel sheet comprising:
a steel sheet including in wt. %:
C 0.1-0.3%;
Mn 1-3%;
Si 0.5-3.5%;
Al 0.05-1.5%;
Mo+Cr being between 0-1.0%; and
a zinc or zinc alloy coating on the cold rolled steel sheet;
the cold rolled, coated, annealed and post tempered steel sheet having a hole expansion from 15 to 33.7%,
a yield strength from 700 to 969 MPa; and
a tensile strength from 1100 to 1240 Mpa;
the cold rolled, coated, annealed and post tempered steel sheet formed from a steel sheet that is cold rolled and zinc coated to define a coated cold rolled steel sheet having a hole expansion that is <15%, and a yield strength that is at least 30% less than the yield strength of the cold rolled, coated and post tempered steel sheet, the coated cold rolled steel sheet annealed to define a cold rolled, coated and annealed steel sheet, the cold rolled, coated and annealed steel sheet then post tempered at a temperature between 150-650°, thereby forming the cold rolled, coated, annealed and post tempered steel sheet.