Nippon Steel Corporation

Nippon Steel Chemical Co., Ltd.

Nippon Steel & Sumitomo Metal Corporation

Masao Sakashita

Shingo Kazama

Tetsuo Sakamoto

Tsutomu Kaneta

Kazuhiro Watanabe

Takero Teramoto

Yoshiyuki Harada

Bunji Shimomura

Hiromasa Shoji

Kenichiro Tadokoro

Tadashi Sakon

Tooru Akashi

Masaya Furukawa

Yoshihiro Kaneda

Kengo Shimanoe

Kazuto Shiraishi

Shuuichi Hamausu

Yasumitsu Kondou

Takerou Teramoto

Shuuichi Hamauzu

Suppression and removal of scales are efficiently carried out in a steel material hot rolling process and the time of pickling treatment as a successive step is greatly shortened. In a water cooling step of metallic material at a temperature of 100&deg; to 1,200&deg; C., scales are removed by applying a direct current or an alternating current to metallic material at 0.1 to 10 A/m of unit surface area from pinch rolls to rolls or apron guides on the outlet side of a hot rolling mill and/or by injecting cooling water at a pH value of &minus;2 to 4 onto the metallic material from cooling headers and apron guides

Method of removing scales and preventing scale formation on metal materials and apparatus therefor

A surface treated metal sheet which is coated with a layer comprising, as main components, a complex and/or salt between a rare earth metal element and an organic compound having in the molecule one or more functional groups selected from among &mdash;O&mdash;, &boxH;O, &mdash;OH, &mdash;COOH, &mdash;NH,, &boxH;NH, &boxH;N&mdash;, &mdash;SH, &mdash;SO,H and phosphoric groups, and a matrix which physically holds the above and has adhesive power for metal sheets, as well as a metal surface treatment solution used therefor.

Surface-treated metal plate and metal surface treating fluid

Surface treated metal materials with corrosion-resistant coating layers composed mainly of oxyacid compounds of rare earth elements (lanthanum, cerium, etc.) or Group IVA elements (zirconium, etc.), oxyacids or mixtures thereof. The corrosion resistant coating layers may also contain resins. Also provided are corrosion resistant coating layers containing rare earth element and Group IVA element compounds in resin matrixes. The corrosion resistant coating layers, particularly inorganic layers, may be covered with resin layers.

Surface treated metal material and surface treating agent

A separation membrane consisting of a polyamide having a unit (I) or a mixing of polyamides having units (I) and (II) and (II') or a polyester having a unit (III) or (IV) and (IV') or a mixture of polyesters having units (III) and (IV) and (IV'):

Organic polymer separation membrane having fluorene skeleton and oxygen

A separation membrane comprising a soluble aromatic polysulfone having the formula --(X--Y)--, wherein X and Y comprise the constituent unit shown below, and the inherent viscosity (.eta..sub.inh) based on the value of a solution of 0.5 g of the polysulfone dissolved in 100 ml of N-methyl-2-pyrrolidone measured at 30.degree. C. is 0.4 or more: ##STR1## wherein R.sub.1 -R.sub.4 are each either H, CH.sub.3 or C.sub.2 H.sub.5, and R.sub.5 -R.sub.6 are each either H, Cl, or NO.sub.2.

Polysulfone separation membrane

A separation membrane consisting of a polyamide having a unit (I) or a mixing of polyamides having units (I) and (II) an (II') or a polyester having a unit (III) or (IV) and (IV') or a mixture of polyesters having units (III) and (IV) and (IV'):

A separation membrane consisting of a polyamide having a unit (I) or a mixing of polyamides having units (I) and (II) and (II') or a polyester having a unit (III) or (IV) and (IV') or a mixture of polyesters having unit (III) and (IV) and (IV'):

A method of producing a polydiacetylene thin film comprises spreading on a water surface a diacetylene compound having one or more conjugated diacetylene groups, subjecting the diacetylene compound to incomplete polymerization by irradiation with ultraviolet rays to an extent incapable of causing complete polymerization, transferring the spread film to a substrate to form a monolayer or built-up film thereon, and irradiating the transferred film with ultraviolet rays or an electron beam to complete the polymerization thereof.

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Kawasaki, Japan

Masao Sakashita