Nippon Steel Nisshin Co., Ltd.

Ns Wheeling-nisshin, Inc.

Nisshin Steel Co., Ltd.

Koutarou Ishii

Shinya Furukawa

Yasunori Hattori

Shinichi Koga

Patrick Edward Pendleton

Takao Tsujimura

Tetsuhiko Okano

Kazuhiro Yamada

Provided is a hot-dip aluminized steel sheet with fine-sized spangles produced in a different way from conventional methods, and a method of producing a hot-dip aluminized steel sheet with fine-sized spangles in a different way from conventional methods. The hot-dip aluminized steel sheet includes: a substrate steel sheet; and an aluminum-based coating which is formed by a hot-dip method on the surface of the substrate steel sheet and in which the average B concentration is not less than 0.005 mass % and the sum of the average Ti concentration and the average V concentration is not more than 0.03 mass %.

Hot-dip aluminized steel strip and method of producing the same

A hot-dip coating equipment includes a cooling rate determining device that includes: a coefficient obtaining section configured to obtain coefficients &#x3b1;, &#x3b2;, &#x3b3;, and &#x3b4; associated with the hot-dip coating bath, in the following equation that expresses a degree of discoloration YI of the surface of a hot-dip coated steel sheet; and a rate determining section configured to determine an average cooling rate A so as to allow the YI of the following Expression (1) to be not more than a predetermined reference value, YI =(&#x3b1;&#xd7;[SE]+&#x3b2;)&#xd7;{(T&#x2212;ST)/A}+&#x3b3;&#xd7;[SE]+&#x3b4; . . . (1), where: [SE] is a concentration (mass %) of a specific element contained in the hot-dip coating bath; T is a temperature (&#xb0; C.) of the hot-dip coating bath; and ST is a solidification temperature (&#xb0; C.) at which the hot-dip coating bath is solidified.

Hot-dip coating equipment including cooling rate determining device, and information processing program

Provided is (i) a hot-dip Al-based alloy-coated steel sheet which includes a coated layer having a surface on which fine spangles are stably and sufficiently formed and which has a beautiful surface appearance due to the fine spangles thus formed on the surface of the coated layer, and (ii) a method of producing such a hot-dip Al-based alloy-coated steel sheet. The hot-dip Al-based alloy-coated steel sheet includes: a substrate steel sheet; and a hot-dip aluminum-based alloy coated layer which is formed on a surface of the substrate steel sheet and which contains boron at an average concentration of not less than 0.005 mass % and contains potassium at an average concentration of not less than 0.0004 mass %.

Hot-dip Al-plated steel sheet and method for producing same

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Tokyo, Japan

Koutarou Ishii