Nippon Steel Corporation

Mitsuru Nakayama

Masafumi Miyazaki

Eiichiro Ishimaru

Eiichi Takeuchi

Hideaki Yamamura

Yasushi Kurisu

Naoya Hamada

Hideki Oka

Mamoru Yamada

Tadahiro Izu

Isao Suichi

Kazumi Seki

Yasuo Maruki

Michio Kaneko

Kiyonori Tokuno

Kazuo Yamagishi

Mitsuyuki Hasegawa

Takao Wada

The titanium material includes a titanium oxide layer formed on a surface of titanium being a base material, the titanium oxide layer having a thickness measured by a glow discharge spectrometry of 60 to 300 nm, wherein: the titanium oxide layer contains 0.5 to 7.0 at % of nitrogen, and an arithmetic mean roughness Ra of a surface thereof is 2.0 to 4.0 &#x3bc;m; and a power spectrum of a surface roughness of the titanium material has a peak of an amplitude height of 0.005 to 0.020 &#x3bc;m in a range of a wavelength of 1.1 to 2.5 &#x3bc;m and has a peak of an amplitude height of 0.0010 to 0.0030 &#x3bc;m in a range of a wavelength of 0.80 to 0.98 &#x3bc;m. An L*a*b* color space may be L*: 30 to 40, a*: 2.0 to 9.0, and b*: &#x2212;7.0 to 18.0.

Titanium material

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

Growing community of inventors

Hikari, Japan

Mitsuru Nakayama