HEAT TREATED HEAVY WEIGHT DRILL PIPE |
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| 申请号 | US14685847 | 申请日 | 2015-04-14 | 公开(公告)号 | US20160305194A1 | 公开(公告)日 | 2016-10-20 |
| 申请人 | Smith International, Inc.; | 发明人 | Wenhui Jiang; Fengxiao Liu; Alan W. Lockstedt; Doyle Wayne Brinegar; | ||||
| 摘要 | A heavy weight drill pipe may include a tube body formed of AISI 1340 alloy steel, and first and second tool joints at respective ends of the tube body, and which are formed of an AISI 41XX series alloy steel. The first and second tool joints may be welded to the tube body at a weld line within a weld region. A Charpy impact toughness at the weld line or surrounding weld region may be least 12 ft-lbs. (16.5 N-m). Yield and tensile strengths at the weld line or weld region may be at least 65 ksi (448.0 MPa) and at least 106 ksi (731.0 MPa), respectively. Material properties at the weld line or weld region may be achieved by heat treating after welding. Heat treating may include austenitizing, quenching, and tempering the weld line and/or the surrounding weld region. | ||||||
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