| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.10 ( December1984 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| The Manufacture of Drill Pipe and Its Properties Yutaka Hirano, Shigeki Takahara, Kunihiko Kobayashi, Shohei Kanari, Takao Kawade, Toshihisa Taue |
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Synopsis : Manufacturing and properties of drill pipes of API 5A E, 5AX X95, 5AX G105, and 5AX S135 are reported. In manufacturing the drill pipes, considerations were paid especially on hardenability, toughness and fatigue properties of the materials and upsetting condition for achieving the smooth profile in the upset portion. Drill pipes thus produced showed good toughness, uniform strength through the entire pipe length, sufficient collapse strength and fatigue strength. Chita Works started commercial production of drill pipes in August 1982. |
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