Title:
HIGH-STRENGTH OIL CASING RESISTANT TO CO2 AND MICROBIAL CORROSION AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/046371
Kind Code:
A1
Abstract:
Provided in the present invention are a high-strength oil casing resistant to CO2 and microbial corrosion and a manufacturing method therefor. In addition to Fe and inevitable impurities, the oil casing further comprises the following chemical elements in percentages by mass: C: 0.06-0.20%, Cr: 1.5-7.0%, Cu: 0.3-3.5%, P≤0.015, and S≤0.007. In the present invention, an oil casing having CO2-SRB-TGB corrosion resistance, a yield strength of ≥758 MPa, preferably ≥800 MPa, and a full-size impact energy at 0ºC of ≥80 J, preferably ≥95 J can be obtained by controlling the addition amounts of Cr and Cu and the contents of the impurity elements of P and S, optimizing the proportions of the chemical elements, using a TMCP production and manufacturing process in combination, and controlling the rolling temperature, the temperature before cooling, and the cooling speed.
Inventors:
QI YAMENG (CN)
ZHOU XIONG (CN)
ZHANG CHUNXIA (CN)
ZHANG ZHONGHUA (CN)
GAO ZHAN (CN)
ZHOU XIONG (CN)
ZHANG CHUNXIA (CN)
ZHANG ZHONGHUA (CN)
GAO ZHAN (CN)
Application Number:
PCT/CN2023/115864
Publication Date:
March 07, 2024
Filing Date:
August 30, 2023
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/54
Foreign References:
| CN113802070A | 2021-12-17 | |||
| CN101082112A | 2007-12-05 | |||
| CN103233180A | 2013-08-07 | |||
| JP2018031027A | 2018-03-01 | |||
| US20180291475A1 | 2018-10-11 |
Attorney, Agent or Firm:
WATSON & BAND INTELLECTUAL PROPERTY AGENT LTD. (CN)
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