Posco

Posco Co., Ltd

Posco Holdings Inc.

Dae-Hyun Song

June Soo Park

Sang-Woo Lee

Junesoo Park

Jaewan Hong

Il-Nam Yang

A method for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises the steps of: hot-rolling a slab to prepare a hot-rolled sheet, the slab containing, in wt %, 2.0 to 6.0% of Si, 0.04 to 0.12% of Mn, 0.001 to 0.022% of N, 0.027 to 0.060% of C, 0.01 to 0.08% of Nb, 0.01% or less of Ti, and the balance of Fe and other inevitable impurities; cold-rolling the hot-rolled sheet to prepare a cold-rolled sheet; and subjecting the primarily recrystallization-annealed cold-rolled sheet to secondary recrystallization annealing.

Grain-oriented electrical steel sheet and method for manufacturing same

A non-oriented electrical steel sheet according to one embodiment of the present invention comprises: 1.5 to 4.0 wt % of Si; 0.1 to 1.5 wt % of Mn, 0.7 to 1.5 wt % of Al; 0.0001-0.003 wt % of Bi; and 0.0001 to 0.003 wt % of Ga, with the balance comprising Fe and inevitable impurities, and satisfies the following Formula 1.[Al]+[Mn]≥0.87  [Formula 1](here, [Al] and [Mn] represent the contents (wt %) of Al and Mn, respectively.)

Non-directional electrical steel sheet and method for producing same

A grain-oriented electrical steel sheet according to an embodiment of the present invention may comprise: by weight %, 2.0-4.0% of Si, 0.04-0.2% of Mn, 0.010% or less (exclusive of 0%) of N, 0.01-0.05% of Sb, 0.005% or less (exclusive of 0%) of C, 0.03-0.08% of Sn, 0.01-0.2% of Cr, and the balance of Fe and inevitable impurities; and precipitates which have an average particle size of 5-50 nm and contain at least one of AlN, (Al, Si)N, (Al, Si, Mn)N, Mns, and CuS.

Grain-oriented electrical steel sheet and method for producing same

A grain-oriented electrical steel sheet according to an embodiment of the present invention includes: an electrical steel sheet substrate including, by wt %, 2.0 to 6.0% of Si, equal to or less than 0.005% of C (excluding 0%), 0.01 to 0.05% of Sb, 0.03 to 0.08% of Sn, 0.01 to 0.2% of Cr, and 0.0003 to 0.097% of Co, and including a remainder of Fe and inevitable impurities; and a metal oxide layer disposed on a surface of the electrical steel sheet substrate, wherein the metal oxide layer includes 0.0005 to 0.25 wt % of Co.

A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt %, C at 0.005% or less (excluding 0%), Si at 0.5 to 2.4%, Mn at 0.4 to 1.0%, S at 0.005% or less (excluding 0%), Al at 0.01% or less (excluding 0%), N at 0.005% or less (excluding 0%), Ti at 0.005% or less (excluding 0%), Cu at 0.001 to 0.02%, and the balance of Fe and inevitable impurities, and satisfies Formula 1 below, wherein a volume fraction of grains in which an angle formed by a {111} surface and a rolling surface of the steel sheet is 15° or less is 27% or more.[Mn]/([Si]+150×[Al])≤0.35  [Formula 1] (In Formula 1, [Mn], [Si], and [Al] are contents (wt %) of Mn, Si, and Al, respectively.)

Non-oriented electrical steel sheet and method for producing same

The present invention relates to a grain-oriented electrical steel sheet including 2.0 to 6.0 wt % of Si, 0.01 wt % or less (excluding 0 wt %) of C, 0.01 wt % or less (excluding 0 wt %) of N, and 0.005 to 0.1 wt % of Co, and including a balance of Fe and other inevitable impurities.

Grain-oriented electrical steel sheet and manufacturing method therefor

The present invention relates to a non-oriented electrical steel sheet including 1.5 to 4.0 wt % of Si, 0.1 to 1.5 wt % of Al, 0.1 to 1.5 wt % of Mn, 0.005 wt % or less (excluding 0%) of C, 0.005 wt % or less (excluding 0%) of N, 0.005 wt % or less (excluding 0%) of Ti, 0.001 to 0.005 wt % of S, 0.1 wt % or less (excluding 0%) of P, 0.02 to 0.2 wt % of at least one of Sn and Sb, and a balance of Fe and other inevitable impurities; and satisfying the following Formulas 1, 2, and 3.0.9&#x2264;[Al]+[Mn]&#x2264;2.1&#x2003;&#x2003;[Formula 1]0.2&#x2264;([Si]+[Al]+[Mn]/2)*([P]+[Sn]+[Sb])&#x2264;0.4&#x2003;&#x2003;[Formula 2](ss)/(s*t)&#x2264;0.5&#x2003;&#x2003;[Formula 3] (In Formula 1 and Formula 2, [Al], [Mn], [Si], [P], [Sn], and [Sb] represent the content (weight %) of Al, Mn, Si, P, Sn, and Sb, respectively, and in Formula 3, t represents the thickness (mm) of the non-oriented electrical steel sheet, Gsrepresents the average grain size (&#x3bc;m) from 0 to t/4 or 3t/4 to t based on the thickness direction of the non-oriented steel sheet, Gsrepresents the average grain size (&#x3bc;m) from more than t/4 to less than 3t/4 based on the thickness direction of the non-oriented steel sheet.)

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Pohang-si, South Korea

Dae-Hyun Song