Nippon Steel Sumitomo Metal Corporation

Sumitomo Metal Industries, Inc.

Takateru Inage

Yasuyoshi Hidaka

Yasuto Higashida

Kouji Nakaike

Yoshihiko Hayashi

Kazuhiro Shimoda

Naoya Hirase

Tatsuya Okui

Yosuke Tatebayashi

Masaharu Nakamori

Jyun Nagakita

Fumihito Yoshikawa

Takayuki Aisaka

Fumio Okayama

A piercing plug includes a plug main body, and a sprayed coating which is formed on a surface of the plug main body and includes iron and iron oxide. A chemical composition of the sprayed coating includes, in addition to the iron and the iron oxide, by mass %, C: 0.015% to 0.6%, Si: 0.05% to 0.5%, Mn: 0.1% to 1.0%, and Cu: 0 to 0.3%.

Piercing plug and manufacturing method of piercing plug

A piercing and rolling plug has a film composed of oxides such as FeOand FeO and Fe (metal) as being formed on the surface of the base metal by electric arc spraying using an iron wire whose main component is Fe and, owing to this film, a plug excellent in heat-shielding and seizure-preventing effects can be realized and the lifetime of the plug can be prolonged. Further, in regenerating this plug, a film can be re-formed via the steps of shot blasting of the as-used plug in piercing and rolling and electric arc spraying in that order; thus, it is possible to regenerate the plug at low cost and in a short period of time.

Piercing and rolling plug, method of regenerating such piercing and rolling plug, and equipment line for regenerating such piercing and rolling plug

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Tokyo, Japan

Takateru Inage