As-rolled type K55 electric resistance welded oil well pipe and hot-rolled steel sheet

Assignee

• Nippon Steel

Inventors

• Tetsuo Ishitsuka (7 patents)
• Takashi TSUSUE (2 patents)
• Shuji Iwamoto (3 patents)
• Shunichi Kobayashi (8 patents)
• Toshiyuki Ogata (45 patents)
• Osamu Yoshida (183 patents)
• Hideto Kawano (2 patents)

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