Posco

Yong Soo Kim

Hun Ju Lee

Su-Yong Shin

Jae Hoon Kim

Su Yong Sin

Jong Il Park

Jin Su Bae

Oh Dae Kim

Yun Hyeon Kim

Myoung Koo Kang

A non-oriented electric steel sheet includes 2.5 wt % to 3.1 wt % of Si, 0.1 wt % to 1.3 wt % of Al, 0.2 wt % to 1.5 wt % of Mn, 0.008 wt % or less of C (excluding 0 wt %), 0.005 wt % or less of S (excluding 0 wt %), 0.005 wt % or less of N (excluding 0 wt %), 0.005 wt % or less of Ti (excluding 0 wt %), 0.001 wt % to 0.07 wt % of Mo, 0.001 wt % to 0.07 wt % of P, 0.001 wt % to 0.07 wt % of Sn, and 0.001 wt % to 0.07 wt % of Sb, in which a remainder includes Fe and inevitable impurities, an average crystal grain diameter is 70 &#x3bc;m to 150 &#x3bc;m, the non-oriented electric steel sheet satisfies Equations (1) and (2),0.32&#x2264;([Al]+[Mn])/[Si]&#x2264;0.5&#x2003;&#x2003;[Equation 1]0.025&#x2264;[Mo]+[P]+[Sn]+[Sb]&#x2264;0.15&#x2003;&#x2003;[Equation 2] (here, a bracket denotes the contents (wt %) of each element).

Non-oriented electrical steel sheet and manufacturing method therefor

A non-oriented electrical steel sheet according to an embodiment of the present invention, comprises: Si: 2.0 to 3.5%, Al: 0.05 to 2.0%, Mn: 0.05 to 2.0%, In: 0.0002 to 0.003% by wt % and Fe and inevitable impurities as the remainder.

A non-oriented electrical steel sheet according to an embodiment of the present invention may include, by weight, by weight, 2.0 to 3.5% of Si, 0.3 to 2.5% of Al, 0.3 to 2.5% of Mn, individually or in a total amount of 0.0005 to 0.03% of at least one of Ga and Ge, and the remainder including Fe and impurities, and may satisfy the following Formula 1.0.2&#x2264;([Si]+[Al]+0.5&#xd7;[Mn])/(([Ga]+[Ge])&#xd7;1000)&#x2264;5.27&#x2003;&#x2003;[Formula 1]([Si], [Al], [Mn], [Ga] and [Ge] represent the content (% by weight) of Si, Al, Mn, Ga and Ge, respectively).

There are provided a device and method for detecting joint parts of a steel strip in an endless hot rolling process. The device for detecting joint parts of a steel strip in an endless hot rolling process includes an image signal collection block receiving image signals, each having information on gray level pixels of a steel strip, from a charge coupled device (CCD) camera; an edge line detection block receiving the image signals from the image signal collection block to detect an edge line of the steel strip; a profile calculation block receiving information on the detection of the edge line from the edge line detection block to calculate the sum of gray levels up to an edge line of the steel strip in a traverse direction of the steel strip when the edge line is detected by the edge line detection block; a joint part judgement block receiving information on the sum of the gray levels, which shows a current profile value, from the profile calculation block to judge the edge line as a joint part when a ratio of a mean value of the current profile and a mean value of the previous profile is less than a predetermined value; and an output block receiving information on the judgement of the edge line as the joint part from the joint part judgement block to output a joint part-detecting signal when the edge line is judged to be a joint part.

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Pohang-si, South Korea

Yong Soo Kim