	US 12,240,057 B2
	Method of laser cutting steel
Murali Manohar, Valparaiso, IN (US)
Assigned to ArcelorMittal, Luxembourg (LU)
Appl. No. 17/299,553
Filed by ArcelorMittal, Luxembourg (LU)
PCT Filed Nov. 21, 2019, PCT No. PCT/IB2019/060016 § 371(c)(1), (2) Date Jun. 3, 2021, PCT Pub. No. WO2020/121088, PCT Pub. Date Jun. 18, 2020.
Claims priority of application No. PCT/IB2018/059988 (WO), filed on Dec. 13, 2018.
Prior Publication US 2022/0016732 A1, Jan. 20, 2022
Int. Cl. B23K 26/38 (2014.01); B23K 26/40 (2014.01); B23K 103/04 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01)

CPC B23K 26/38 (2013.01) [B23K 26/40 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); B23K 2103/04 (2018.08)]

6 Claims

1. A method for laser cutting a steel alloy sheet/plate, the method comprising the steps of:

providing a steel cutting laser;

providing a laser cuttable steel alloy sheet/plate, the steel alloy sheet/plate having a composition consists, in wt. %, of: C: 0.10-0.25; Mn: 0.8-1.2; P: 0.04 max; S: 0.05 max; Si: 0.15 max; Cr: 0.55-0.75, and a remainder being iron and impurities, the steel alloy being free from intentional additions of Cu and Ni and containing less than 0.05% of total cumulated amounts of Cu and Ni;

directing a laser beam from the steel cutting laser to the laser cuttable steel alloy sheet/plate; and

cutting said laser cuttable steel alloy sheet/plate with the laser beam.