Mitsubishi Heavy Industries Limited

Kyung-Zoon Min

Junsou Fukumori

Tsutomu Kawamizu

Jae-Young Lee

Akira Kaya

Kazuya Tsurusaki

Keiji Mizuta

Mikio Yamamoto

Kwang-Hee Han

Etsurou Hirai

Kozo Wada

Yuuji Asahara

Jung-Do Park

Yeo-Joo Choi

Soo-Chul Shin

Kwang-Hum Han

Sang-Wook Ha

Seung-Sam Lee

Young-Gil Seo

An alloying system for a galvanized steel sheet, the alloying system using an induction heating coil, wherein an impedance matching apparatus is provided between the induction heating coil and a high frequency power source. The impedance matching apparatus comprises a matching transformer having a plurality of intermediate contact points for arbitrarily selecting a turn ratio, and a switching device for alternative changeover of the intermediate contact point, whereby even when the load impedance of the steel sheet varies, maximum power source output is obtained, such that an appropriate heating temperature necessary for forming an alloy layer of the steel sheet can be supplied.

Impedance matching apparatus for induction heating type galvanized steel sheet alloying system and method

A plurality of finishing mills for finish rolling a rolled material are located in a row to configure a finishing mill group. First to third surface coolers for cooling surfaces of the rolled material are located on an entry side of each of first, second and third finishing mills of the finishing mill group, and the amount of cooling water jetted at the rolled material by each surface cooler under a command of a controller is set at 4,000 liters/min.multidot.m.sup.2, whereby the thickness of scale is restricted to 5 .mu.m or less.

Method and system for suppressing surface oxide film during hot finish

A plurality of finishing mills for finish rolling a rolled material are arranged in a row to construct a finishing mill group, 1st to 3rd surface coolers for cooling the surfaces of the rolled material are provided on the entrance side of the 1st to 3rd finishing mills of the fishing mill group, and the range of cooling of the rolled material by the surface coolers are set to be a range of 0.3 to 1.5 m toward the upstream side from a position separated by 1.5 m or less from the center of the work rolls of each of the finishing mills toward the entrance side of each of the finishing mills.

Method and system for suppressing formation of scale defects during hot

A plurality of finishing mills for finish rolling a rolled material are arranged in a row to form a finishing mill group. A scale breaker is provided at an entry side of the finishing mill group, a glass coating material application device for jetting molten glass to upper and lower surfaces of the rolled material to form a molten glass film is located at a delivery side of the scale breaker, and a molten glass film removing device for removing the molten glass film formed on the upper and lower surfaces of the rolled material is located at the delivery side of the finishing mill group.

Method and system for suppressing formation of scale in hot finishing

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Tokyo, Japan

Kyung-Zoon Min