Posco

Chan-Hee Han

Kyu-Seok Han

Byung-Deug Hong

Jae-Soo Lim

Min Soo Han

Min Serk Kwon

Hyun-Chul Park

Oh-Yeoul Kwon

Won-Gul Lee

Soon-Bok Park

Provided is an electrical steel sheet comprising: a groove formed in a surface of a steel sheet, wherein the groove includes a bottom surface, a first side surface extending from the bottom surface, and a second side surface extending from the bottom surface in opposite to the first side surface, wherein the groove has a depth from the surface to the bottom surface, a width in a rolling direction of the steel sheet, and a length in a width direction of the steel sheet, and wherein the groove is formed through laser-irradiation and removal of melt produced by the laser-irradiation; an opening defined by the bottom surface, the first side surface and the second side surface; and a first solidification portion formed on the first side surface of the groove. The first solidification portion is formed by a solidification of part of the melt produced from the laser-irradiation.

Electrical steel sheet and method for manufacturing the same

An oriented electrical steel sheet and a method of manufacturing the same are provided, and in a method of manufacturing an oriented electrical steel sheet including processes of producing a hot rolled plate by hot rolling a steel slab, performing or omitting hot rolled plate annealing, performing cold rolling, performing decarburization and nitride annealing, and performing final high temperature annealing, the decarburization and nitride annealing process is performed in a dew point range of 35-55&#xb0; C., and in the final annealing process, a glassless additive including MgO is applied.

Grain-oriented electrical steel sheet, and method for manufacturing the same

Provided is a grain-oriented electric steel sheet having superior magnetic property and to a grain-oriented electric steel sheet including 2.0 to 4.5 weight % of Si, 0.001 to 0.10 weight % of C, 0.010 weight % or lower of Al, 0.08 weight % or lower of Mn, 0.005 weight % or lower of N, 0.002 to 0.050 weight % of S, the remainder being Fe and other unavoidable impurities. The steel sheet having been subjected to secondary recrystallization using at least any one of grain boundary-segregated elementary S and an FeS precipitate as a grain growth inhibitor.

Grain-oriented electric steel sheet having superior magnetic property

Provided is a grain-oriented electric steel sheet and a method for manufacturing same, the steel sheet having superior magnetic properties. The method comprises heating a slab comprising 2.0 to 4.5 weight % of Si, 0.001 to 0.10 weight % of C, 0.010 weight % or lower of Al, 0.08 weight % or lower of Mn, 0.005 weight % or lower of N, 0.002 to 0.050 weight % of S, the remainder being Fe and other unavoidable impurities, performing hot-rolling of the heated slab, performing cold-rolling one time or two or more times including an intermediate annealing, performing decarbonization and re-crystallizing annealing, and performing secondary re-crystallizing annealing.

Growing community of inventors

Pohang-si, South Korea

Chan-Hee Han