Title:
HIGH-STRENGTH PETROLEUM PIPE CASING AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/231981
Kind Code:
A1
Abstract:
Disclosed is a high-strength petroleum pipe casing, which contains Fe and inevitable impurity elements, and further contains the following chemical elements in percentage by mass: 0.06-0.15% of C, 0.3-0.5% of Si, 1.5-2.2% of Mn, 0.002-0.006% of rare earth (La, Ce), less than or equal to 0.05% of Ti, 0.01-0.03% of Al, and greater than 0 but less than or equal to 0.008% of N. Correspondingly, also disclosed is a manufacturing method for the high-strength petroleum pipe casing. The manufacturing method comprises the steps: (1) smelting and casting; (2) perforation; (3) rolling; (4) sizing; (5) online quenching: controlling the temperature of the pipe casing body before cooling to be not lower than 780°C; water cooling the outer surface of the pipe casing, the cooling speed being 40-100°C/s, and controlling the final cooling temperature to be not higher than 100°C; (6) tempering, wherein the tempering temperature is controlled to be 500-620°C, and the heat preservation time is 40-70 min; and (7) hot straightening.
Inventors:
DONG XIAOMING (CN)
GAO ZHAN (CN)
PENG LIYANG (CN)
XU FUCHANG (CN)
GAO ZHAN (CN)
PENG LIYANG (CN)
XU FUCHANG (CN)
Application Number:
PCT/CN2023/096906
Publication Date:
December 07, 2023
Filing Date:
May 29, 2023
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/00; C21D8/02; C22C38/06; C22C38/14
Foreign References:
| CN104651723A | 2015-05-27 | |||
| CN110462080A | 2019-11-15 | |||
| EP3543366A1 | 2019-09-25 | |||
| CN102203301A | 2011-09-28 | |||
| CN103602904A | 2014-02-26 | |||
| CN103290338A | 2013-09-11 |
Other References:
TAO, XUEZHI ET AL.: "Heat Treatment Process for Steel Pipe with Water Quenching", W1F (STEEL PIPE, vol. 35, no. 2, 30 April 2006 (2006-04-30), XP009509114
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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