	US 11,942,247 B2
	Grain oriented electrical steel with improved forsterite coating characteristics
Jerry William Schoen, Cincinnati, OH (US); Kimani Tirawa Partin, Franklin, OH (US); and Christopher Mark Wilkins, Centennial, CO (US)
Assigned to Cleveland-Cliffs Steel Properties Inc., Cleveland, OH (US)
Filed by AK Steel Properties, Inc., West Chester, OH (US)
Filed on Dec. 21, 2017, as Appl. No. 15/850,033.
Application 15/850,033 is a division of application No. 14/468,963, filed on Aug. 26, 2014, granted, now 9,881,720.
Claims priority of provisional application 61/870,332, filed on Aug. 27, 2013.
Prior Publication US 2018/0137958 A1, May 17, 2018
Int. Cl. H01F 1/147 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/34 (2006.01); C21D 1/76 (2006.01)

CPC H01F 1/14783 (2013.01) [C21D 8/1255 (2013.01); C21D 8/1283 (2013.01); C21D 8/1288 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/008 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/34 (2013.01); H01F 1/14791 (2013.01); C21D 1/76 (2013.01); C21D 8/1222 (2013.01)]

2 Claims

1. A grain oriented electrical steel sheet comprising chromium in a concentration of greater than about 1.2 wt. %, wherein during decarburization annealing the grain oriented electrical steel sheet has been rapidly heated at a rate in excess of 500° C/second to a temperature of about 700° C.; and wherein the grain oriented electrical steel sheet further comprises a forsterite coating formed on at least one surface of the grain oriented electrical steel sheet, wherein the forsterite coating has a free surface and wherein the forsterite coating is comprised of oxygen in a concentration greater than or equal to about 7.0 wt. % at one or more points in a region defined by a depth of about 2-3 μm below the free surface of the forsterite coating.