Posco Co., Ltd

Posco

Byung-Keun Bae

Jae-Kwan Kim

Jong-Tae Park

Yong-Soo Kim

Su-Yong Sin

Jae-Young Choi

Chel-Min Park

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

The present invention relates to technology for manufacturing electrical steel sheets having excellent magnetic properties through the control of a hot-rolled texture using the phase transformation of steel. More particularly, it relates to a non-oriented electrical steel sheet that has reduced iron loss and increased magnetic flux density by controlling alloy component elements and optimizing hot-rolling conditions, even though hot-rolled sheet annealing is not carried out, as well as a manufacturing method thereof. More specifically, the invention provides a non-oriented electrical steel sheet which has excellent magnetic properties while hot-rolled sheet annealing can be omitted, the steel sheet being comprised of 0.005 wt % or less of C, 1.0-3.0 w % of Si, 0.1-2.0 wt % of Mn, 0.1 wt % or less of P, 0.1-1.5 wt % of Al, and a remainder of Fe and other inevitable impurities, in which the relationship between the elements Mn and Al satisfies an equation of &#x2212;0.2&#x3c;m(=Mn&#x2212;Al)&#x3c;1.0, and a slab for the steel sheet, when reheated, has a two-phase region of austenite+ferrite at a temperature ranging from ArI to 1250&#xb0; C.

Non-oriented electrical steel sheets with excellent magnetic properties and method for manufacturing the same

The invention relates to a non-oriented electrical steel sheet, widely used as an iron core in electric devices, and to a method of manufacturing the same. The non-oriented electrical sheet includes 0.004 wt. % or less C; 1.0-3.5 wt. % Si; 0.02 wt. % or less P; 0.001 wt. % or less S; 0.2&#x2dc;2.5 wt. % Al; 0.003 wt. % or less N; 0.004 wt. % or less Ti; Mn, in which the amount thereof is represented by the following formula (1): 0.10+100&#xd7;S(wt. %)&#x2266;Mn(wt. %)&#x2266;0.21+200&#xd7;S(wt. %)&#x2014;(1); a balance of iron; and inevitable impurities. Final magnetic properties are greatly improved because fine precipitates are formed by S, the amount of Mn can be suitably determined in order to inhibit the formation of the fine precipitates, the formation of fine precipitate CuS is inhibited because precipitates CuS, MnS are formed by adding Sn, Ni and Cu, and a texture, which determines a temperature of annealing a hot rolled steel plate and magnetic properties, is controlled, thereby manufacturing an inexpensive and optimum non-oriented electrical steel sheet.

Non-oriented electrical steel sheets with improved magnetic property and method for manufacturing the same

Growing community of inventors

Kyungsangbuk-do, South Korea

Byung-Keun Bae