Posco

Posco Co., Ltd

Posco Holdings Inc.

June Soo Park

Dae-Hyun Song

Jaewan Hong

Dae Hyun Song

Yong-Soo Kim

Su-Yong Shin

Seung Il Kim

Se Il Lee

Jae Hoon Kim

Il-Nam Yang

Il Nam Yang

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 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.

Grain-oriented electrical steel sheet and method for producing same

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

A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt %, Si at 0.2 to 4.3%, Mn at 0.05 to 2.5%, Al at 0.1 to 2.1%, Bi at 0.0001 to 0.003%, Ga at 0.0001 to 0.003%, and the balance of Fe and inevitable impurities.

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.)

Non-oriented electrical steel sheet and manufacturing method therefor

According to an exemplary embodiment of the present invention, a manufacturing method of a grain-oriented electrical steel sheet, includes: preparing a slab; heating the slab; forming a hot-rolled sheet by hot-rolling the slab; performing hot-rolled sheet annealing on the hot-rolled sheet; forming a cold-rolled sheet by cold-rolling the hot-rolled sheet that has been completely subjected to the hot-rolled sheet annealing; performing first recrystallization annealing on the cold-rolled sheet; and performing second recrystallization annealing on the cold-rolled sheet that has been completely subjected to the first recrystallization annealing, wherein the hot-rolled sheet undergoes a first heating step, a second heating step, and a soaking step, and a temperature rise rate tof the first heating step and a temperature rise rate tof the second heating step satisfy Formula 1.5&#xd7;&#x2003;&#x2003;[Formula 1]

A non-grain oriented electrical steel sheet according to an exemplary embodiment of the present invention includes Si: 1.0 to 4.0%, Mn: 0.1 to 1.0%, Al: 0.1 to 1.5%, Zn: 0.001 to 0.01% B: 0.0005 to 0.005%, and a balance including Fe and inevitable impurities.

The non-oriented electrical steel sheet according to one embodiment of the present invention includes: by weight, 2.0% to 4.0% of Si; 0.001% to 2.0% of Al; 0.0005% to 0.009% of S; 0.02% to 1.0% of Mn, 0.0005% to 0.004% of N; 0.004% or less of C (excluding 0%); 0.005% to 0.07% of Cu; 0.0001% to 0.007% of O; individually or in a total amount of 0.05% to 0.2% of Sn or P; and the remainder comprising Fe and impurities; wherein the non-oriented electrical steel sheet is composed of a surface portion to 2 &#x3bc;m from the surface of the steel sheet in the thickness direction and a base portion exceeding 2 &#x3bc;m from the surface of the steel sheet in the thickness direction, and wherein the number of surfides having a diameter of 10 nm to 100 nm is larger than the number of the nitrides having a diameter of 10 nm to 100 nm, in the same area of base portion.

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Pohang-si, South Korea

June Soo Park