Nippon Steel Corporation

Isao Suichi

Eiichiro Ishimaru

Hideaki Yamamura

Masafumi Miyazaki

Eiichi Takeuchi

Yasushi Kurisu

Naoya Hamada

Hideki Oka

Mamoru Yamada

Tadahiro Izu

Mitsuru Nakayama

Kazumi Seki

Yasuo Maruki

Takashi Arai

Takeshi Kubota

Yousuke Kurosaki

Yoshihiro Arita

Kenji Kosuge

Shigenori Tanaka

A quench solidification method, wherein a steel cast strip having a mean grain size 50 &#x3bc;m or more is prepared and then the steel cast strip is rolled to produce a non-oriented electrical steel sheet having high magnetic flux density in both L and C directions. However the magnetic flux density reduces when the cold reduction rate exceeds 70%. To avoid this problem the non-oriented electrical steel sheet is manufactured with a ratio of at least 4 of the integrated intensity of the {100} plane for a given sample of steel to the integrated intensity of {100} plane for a 'random' sample in which crystal grains have random orientations; and a cold reduction rate of the cold-rolling is between 70% and 85%. The superheating degree of the molten steel can be 70&#xb0; C. or more.

Method for manufacturing non-oriented electrical steel sheet having high magnetic flux density

A cooling drum for metal cast strip by continuous casting has dimples 40 to 200 &#x3bc;m in average depth and 0.5 to 3 mm in diameter of circle equivalent formed on a plated peripheral surface of the cooling drum, adjacent to each other at rims of the dimples; and a film, containing oxides of at least one member selected from the group consisting of Ni&#x2014;W, Ni&#x2014;Co&#x2014;W, Cr, Ni&#x2014;Fe and Ni&#x2014;Al, is formed on the peripheral surface.

Cooling drum for thin slab continuous casting, processing method and apparatus thereof, and thin slab and continuous casting method thereof

Dimples, preferably 40 to 200 &#x3bc;m in average depth and 0.5 to 3 mm in diameter of circle equivalent, are formed on the peripheral surface of a cooling drum, adjacent to each other at the rims of the dimples; and fine humps (preferably, fine humps 1 to 50 &#x3bc;m in height and 5 to 200 &#x3bc;m in diameter of circle equivalent on the surfaces of the dimples and/or fine humps 1 to 50 &#x3bc;m in height and 30 to 200 &#x3bc;m in diameter of circle equivalent at the rims of the dimples), fine holes (preferably, fine holes 5 &#x3bc;m or more in depth and 10 to 200 &#x3bc;m in diameter of circle equivalent), or fine unevenness (preferably, fine unevenness 1 to 50 &#x3bc;m in average depth and 10 to 200 &#x3bc;m in diameter of circle equivalent) are formed at the rims and/or on the indented surfaces of said dimples.

Cooling drum for continuously casting thin cast piece and fabricating method and device therefor and thin cast piece and continuous casting method therefor

Thin continuous cast plate and process for manufacturing the same

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Hikari, Japan

Isao Suichi