Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Nippon Steel Engineering Co., Ltd.

Hiromitsu Date

Takumi Nishimoto

Eri Hoshiba

Takashi Fujii

Kenichiro Tadokoro

Akira Taniyama

Masaki Ando

Kenichi Uemura

Takamitsu Takagi

Nobuyuki Hayashi

Yuta Ozaki

Shintaro Obara

Toru Kanatani

Mikito Ueda

An ultrasonic treatment apparatus according to the present invention includes: a treatment tank capable of containing a treatment object and a treatment liquid for immersing the treatment object; and an ultrasonic application mechanism that applies ultrasonic waves to the treatment liquid, wherein the treatment tank has a long axis where cross-sectional shapes are substantially identical to each other, and a wall surface to a scheduled liquid level height line of the treatment liquid is formed by a concave surface, and the ultrasonic application mechanism is installed at a position where an angle &#x3b8; formed by a normal line of an oscillation surface of ultrasonic waves and the scheduled liquid level line of the treatment liquid is 5&#xb0; to 80&#xb0;.

Ultrasonic treatment apparatus

A Si/Mn ratio of steel material components of a base material is not less than 0.27 nor more than 0.90 in mass ratio, an internal oxide layer having a thickness of not less than 1 &#x3bc;m nor more than 30 &#x3bc;m is provided right below an oxide scale of a steel sheet surface layer portion, and regarding the internal oxide layer, an internal oxide in a crystal grain of the internal oxide layer is an oxide containing Si and having a thickness of not less than 10 nm nor more than 200 nm in a crystal grain in a range of greater than 0% and 30% or less of a thickness of the internal oxide layer from an interface between the internal oxide layer and base iron toward a direction of the surface layer oxide scale, one or more branches of the internal oxide exist in a cross section of 1 &#x3bc;m&#xd7;1 &#x3bc;m square, and in any crystal grain boundary having a length of 1 &#x3bc;m, one or more of the internal oxides in the crystal grain are connected to an internal oxide of the crystal grain boundary to form a net-like structure.

Hot-rolled steel sheet and manufacturing method thereof, and manufacturing method of cold-rolled steel sheet

An ultrasonic cleaning equipment () according to the present invention includes a treatment tank () that stores a cleaning liquid that cleans an object to be cleaned and in which the object to be cleaned is immersed; an ultrasonic application mechanism () that applies ultrasonic waves to the cleaning liquid retained in an interior of the treatment tank; and a curved surface member () that is located in a range defined by an angle of inclination from a perpendicular direction in an end portion of a vibrating surface of the ultrasonic application mechanism to an outside with respect to the vibrating surface and that is held on a wall surface and/or a bottom surface of the treatment tank.

Ultrasonic cleaning equipment and ultrasonic cleaning method

A plated steel sheet for cans with excellent secondary adhesion of an organic film and high corrosion resistance is provided, that is, a plated steel sheet for cans, which is a plated steel sheet having a alloy tin layer and a metallic tin layer in sequence from the steel sheet side, wherein a chemical conversion layer comprising tin oxide in an amount of 0.3 to 5.0 mC/cmin terms of electricity necessary for reduction and tin phosphate in an amount of 0.5 to 5.0 mg/min terms of P is provided on the metallic tin layer and zirconium(IV) oxide in an amount of 0.2 to 5 mg/min terms of Zr is provided on the chemical conversion layer. A production method thereof is also provided.

Plated steel sheet for cans and production method thereof

Plated steel sheet comprised of steel sheet having a tin alloy layer on it, which is characterized by (i) having free tin distributed on the tin alloy layer in a 5 to 97% area rate and further (ii) having a chemically treated layer having phosphate in an amount of 1.0 to 5.0 mg/min terms of P and tin oxide in an amount of 0.3 to 4.0 mC/cmin terms of electricity necessary for reduction, formed on the tin alloy layer and free tin.

Plated steel sheet for cans

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Tokyo, Japan

Hiromitsu Date