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Yasuharu Sakuma

Nippon Steel

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Featured researches published by Yasuharu Sakuma.

PROCEEDINGS OF IBEC 2003 (INTERNATIONAL BODY ENGINEERING CONFERENCE), HELD OCTOBER 2003, CHIBA, JAPAN | 2003

ADVISABLE GRADES OF HIGH-STRENGTH STEEL SHEETS AND WELDING CONDITIONS FOR SPOT-WELD STRENGTH IN AUTOMOTIVE BODY APPLICATION

Yasuharu Sakuma; Shunji Hiwatashi; Hatsuhiko Oikawa

Experimental study on static strength of spot-welds for high-strength steel sheets is summarized, focusing on thicker and coated sheets. Tensile shear strength (TSS) increases with sheet strength and thickness. Cross tensile strength (CTS) also increases, but the variation with sheet strength is small. Welding with expulsion deteriorates CTS, especially for thicker or coated sheets with higher strength or carbon content. Blow-holes and shrinkage cavities are found frequently at thicker sheet welds, and their existence near nugget edge reduces CTS. Above-mentioned knowledge leads developments of galvannealed sheets with carbon content less than 0.1% for tensile strength up to 180MPa. (A) For the covering abstract see ITRD E121867.

Archive | 1997

High-strength steel plate having high dynamic deformation resistance and method of manufacturing the same

Osamu Kawano; Yuzo Takahashi; Junichi Wakita; Hidesato Mabuchi; Manabu Takahashi; Akihiro Uenishi; Riki Okamoto; Yukihisa Kuriyama; Yasuharu Sakuma

Archive | 2010

HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT HYDROGEN EMBRITTLEMENT RESISTANCE AND MAXIMUM TENSILE STRENGTH OF 900 MPa OR MORE, AND PROCESS FOR PRODUCTION THEREOF

Masafumi Azuma; Noriyuki Suzuki; Naoki Maruyama; Akinobu Murasato; Yasuharu Sakuma; Hiroyuki Kawata; Chisato Wakabayashi

Archive | 2004

High-yield-ratio high-strength thin steel sheet and high-yield-ratio high-strength hot-dip galvanized thin steel sheet excelling in weldability and ductility as well as high-yield-ratio high-strength alloyed hot-dip galvanized thin steel sheet and process for producing the same

Naoki Yoshinaga; Shunji Hiwatashi; Yasuharu Sakuma; Atsushi Itami

Archive | 1995

High-strength steel sheet suitable for deep drawing and process for producing the same

Kazuo Koyama; Matsuo Usuda; Manabu Takahashi; Yasuharu Sakuma; Shunji Hiwatashi; Kaoru Kawasaki

Archive | 2009

High-strength galvanized steel sheet, high-strength alloyed hot-dip galvanized sheet, and high-strength cold-rolled steel sheet which excel in moldability and weldability, and manufacturing method for the same

Masafumi Azuma; Naoki Yoshinaga; Naoki Maruyama; Noriyuki Suzuki; Yasuharu Sakuma

Archive | 1998

High-strength steel sheet highly resistant to dynamic deformation and excellent in workability and process for the production thereof

Osamu Kawano; Junichi Wakita; Yuzo Takahashi; Hidesato Mabuchi; Manabu Takahashi; Akihiro Uenishi; Yukihisa Kuriyama; Riki Okamoto; Yasuharu Sakuma

Archive | 2010

HIGH STRENGTH STEEL PLATE WITH ULTIMATE TENSILE STRENGTH OF 900 MPa OR MORE EXCELLENT IN HYDROGEN EMBRITTLEMENT RESISTANCE AND METHOD OF PRODUCTION OF SAME

Masafumi Azuma; Noriyuki Suzuki; Naoki Maruyama; Akinobu Murasato; Yasuharu Sakuma; Hiroyuki Kawata; Chisato Wakabayashi

Archive | 2009

HIGH-STRENGTH COLD-ROLLED STEEL SHEET, HIGH-STRENGTH GALVANIZED STEEL SHEET, AND HIGH-STRENGTH ALLOYED HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT FORMABILITY AND WELDABILITY, AND METHODS FOR MANUFACTURING THE SAME

Masafumi Azuma; Naoki Yoshinaga; Naoki Maruyama; Noriyuki Suzuki; Yasuharu Sakuma

Archive | 2003

Factors to Determine Static Strengths of Spot-weld for High Strength Steel Sheets and Developments of High-strength Steel Sheets with Strong and Stable Welding Characteristics

Yasuharu Sakuma; Hatsuhiko Oikawa

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Collaboration

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Naoki Yoshinaga

Nippon Steel

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Atsushi Itami

Kyoto University

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Masafumi Azuma

Nippon Steel

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Manabu Takahashi

Nippon Steel

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Akihiro Uenishi

Nippon Steel

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Hidesato Mabuchi

Nippon Steel

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Junichi Wakita

Nippon Steel

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Naoki Maruyama

Nippon Steel

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Osamu Kawano

Nippon Steel

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Shunji Hiwatashi

Nippon Steel

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