Posco

Posco Co., Ltd

Yong-Soo Kim

Su-Yong Shin

Jae-Hoon Kim

Su-Yong Sin

Jae-Song Kim

Jin-Keun Oh

Il-Ryoung Sohn

Yeol-Rae Cho

Jung-Woo Kim

June Soo Park

Hun Ju Lee

Jae Kyoum Kim

Junesoo Park

Seung Il Kim

Jae-Kwan Kim

Jaewan Hong

Won-Seog Bong

Byung-Keun Bae

Wonjin Kim

Yun-Hyeon Kim

Jong-Il Park

Jin-Su Bae

Oh-Dae Kim

Myoung-Koo Kang

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.

Non-directional 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 0.004 wt % or less (excluding 0 wt %), Si at 2.5 to 4.0 wt %, P at 0.1 wt % or less (excluding 0 wt %), Al at 0.3 to 2.0 wt %, N at 0.003 wt % or less (excluding 0 wt %), S at 0.003 wt % or less (excluding 0 wt %), Mn at 0.15 to 2.5 wt %, Cr at 0.5 wt % (excluding 0 wt %), and the balance including Fe and other impurities unavoidably added thereto; satisfies the following Equation 1; and has an average grain size of 20 μm or less.[Mn]≥1450×[S]−0.8  [Equation 1]

Non-grain oriented electrical steel and method for manufacturing same

The present invention relates to a non-grain-oriented electrical steel sheet which is excellent in high-frequency iron loss, and a manufacturing method thereof. A non-grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 2.5 to 3.8 wt % of Si, 0.5 to 2.5 wt % of Al, 0.2 to 4.5 wt % of Mn, 0.0005 to 0.02 wt % of As, 0.0005 to 0.01 wt % of Bi, the balance Fe, and inevitable impurities, and satisfies the following [Equation 1].0.3≤[surface fine crystal grain diameter]×[fine grain formation thickness]×([As]/[Bi])≤5.0  [Equation 1] In Equation 1, [surface fine crystal grain diameter] means an average particle diameter (μm) of fine crystal grains in an electrode surface layer of an electrical steel sheet, [fine grain formation thickness] means a thickness (mm) of an electrode surface layer in which fine crystal grains are formed, and [As] and [Bi] mean a composition (wt %) of As and a composition (wt %) of Bi, respectively.

Non-oriented electrical steel sheet and manufacturing method therefor

A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes at least one of 2.0 to 3.5% of Si, 0.3 to 3.5% of Al, 0.2 to 4.5% of Mn, 0.0030 to 0.2% of Sn, 0.0030 to 0.15% of Sb, 0.0040 to 0.18% of P, 0.0005 to 0.02% of Zn, and 0.0005 to 0.01% of Y for wt %, a remainder of Fe, and inevitable impurities, and satisfying Formula 1:0.05&#x2264;([Sn]+[Sb])/[P]&#x2264;25&#x2003;&#x2003;[Formula 1](here, [Sn], [Sb], and [P] represent contents (wt %) of Sn, Sb, and P.)

Non-oriented electrical steel sheet and method for preparing same

A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes, by weight %, Si: 2.5 to 6.0%, Al: 0.2 to 3.5%, Mn: 0.2 to 4.5%, Cr: 0.01 to 0.2%, P: 0.005 to 0.08%, Mg: 0.0005 to 0.05%, and a remainder including Fe and inevitable impurities, while satisfying Equation 1 below, and formed with an inner oxidation layer of a 0.2 to 5 &#x3bc;m thickness inside a base steel sheet.&#x2212;2.5&#x2264;[P]/[Cr]&#x2212;[Mg]&#xd7;100&#x2264;6.5&#x2003;&#x2003;[Equation 1](In Equation 1, [P], [Cr], and [Mg] respectively represent a content (by wt %) of P, Cr, and Mg).

A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 2.0 to 4.0% of Si, 0.05 to 1.5% of Al, 0.05 to 2.5% of Mn, equal to or less than 0.005% of C (excluding 0%), equal to or less than 0.005% of N (excluding 0%), 0.001 to 0.1% of Sn, 0.001 to 0.1% of Sb, 0.001 to 0.1% of P, 0.001 to 0.01% of As, 0.0005 to 0.01% of Se, 0.0005 to 0.01% of Pb, 0.0005 to 0.01% of Bi, a remainder of Fe, and inevitable impurities, as wt %, wherein a Taylor factor (M) of each crystal grain included in a steel sheet is expressed in Formula 1, and an average Taylor factor value of the steel sheet is equal to or less than 2.75: (here, &#x3c3; is a macro stress, and &#x3c4;is a critical resolved shear stress).

Non-oriented electrical steel sheet and method for producing same

An Al&#x2014;Fe alloy coated steel sheet includes a base steel sheet and an alloy coating layer, wherein the base steel sheet includes, by wt %, C: 0.1%&#x2dc;0.5%, Si: 0.01%&#x2dc;2%, Mn: 0.01%&#x2dc;10%, P: 0.001%&#x2dc;0.05%, S: 0.0001%&#x2dc;0.02%, Al: 0.001%&#x2dc;1.0%, N: 0.001%&#x2dc;0.02%, and the balance of Fe and other impurities, wherein the alloy coating layer includes: an Al&#x2014;Fe alloy layer I formed on the base steel sheet and having a Vickers hardness of 200&#x2dc;800 Hv; an Al&#x2014;Fe alloy layer III formed on the Al&#x2014;Fe alloy layer I and having a Vickers hardness of 700&#x2dc;1200 Hv; and an Al&#x2014;Fe alloy layer II formed in the Al&#x2014;Fe alloy layer III continuously or discontinuously in a length direction of the steel sheet, and having a Vickers hardness of 400&#x2dc;900 Hv, wherein an average oxygen content at a depth of 0.1 &#x3bc;m from a surface of the oxide layer is 20% or less by weight.

Aluminum-iron alloy-coated steel sheet for hot press forming, having excellent hydrogen delayed fracture resistance, peeling resistance, and weldability and hot-formed member using same

Disclosed are a non-oriented electrical steel sheet and a method of manufacturing the same. The non-oriented electrical steel sheet of the present invention includes 0.005 wt % or less of C, 1.0-4.0 wt % of Si, 0.1-0.8 wt % of Al, 0.01-0.1 wt % of Mn, 0.02-0.3 wt % of P, 0.005 wt % or less of N, 0.001-0.005 wt % of S, 0.005 wt % or less of Ti, 0.01-0.2 wt % of at least one of Sn and Sb, and the remainder including Fe and other impurities unavoidably added thereto, wherein Mn, Al, P, and S may respectively fulfill the empirical formula 0.8&#x2264;{[Mn]/(100*[S])+[Al]}[P]&#x2264;40, wherein [Mn], [Al], [P], and [S] respectively refer to weight percentages of Mn, Al, P, and S.

Non-oriented electrical steel sheet and method of manufacturing the same

Provided is a low iron loss high strength non-oriented electromagnetic steel sheet and a method for manufacturing the same. The method comprises hot-rolling a slab comprising 0.005 weight % or less of C, 4.0 weight % or less of Si, 0.1 weight % or less of P, 0.03 weight % or less of S, 0.1 to 2.0 weight % of Mn, 0.3 to 2.0 weight % of Al, 0.003 weight % or less of N, 0.005 weight % or less of Ti, the remainder being Fe and unavoidable impurities, cold-rolling the slab, and finally annealing the slab such that the fractional area of the non-recrystallization tissue at the cross sectional surface of the steel sheet is 50% or lower (not including 0%).

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Pohang-si, South Korea

Yong-Soo Kim