Title:
HIGH-STRENGTH ANTI-COLLAPSE OIL CASING AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/227921
Kind Code:
A1
Abstract:
A high-strength anti-collapse oil casing and a manufacturing method therefor. The high-strength anti-collapse oil casing comprises the following chemical elements in percentage by mass: 0.08%-0.18% of C; 0.1%-0.4% of Si; 0.1%-0.28% of Mn; 0.2%-0.8% of Cr; 0.2%-0.6% of Mo; 0.02%-0.08% of Nb; 0.01%-0.15% of V; 0.02%-0.05% of Ti; 0.0015%-0.005% of B; and 0.01%-0.05% of Al. The manufacturing method for the high-strength anti-collapse oil casing comprises the steps of: (1) smelting and continuous casting; (2) perforating, rolling and sizing; (3) controlled cooling: the initial cooling temperature being Ar3+50℃ and the final cooling temperature being ≤80℃; during the cooling, only the outer surface of the casing being cooled, and the inner wall of the casing being not cooled; and the speed of the controlled cooling being 30-70℃/s; (4) tempering; and (5) thermal straightening.
Inventors:
DONG XIAOMING (CN)
ZHANG ZHONGHUA (CN)
YANG WEIGUO (CN)
LIU JIAMING (CN)
ZHANG ZHONGHUA (CN)
YANG WEIGUO (CN)
LIU JIAMING (CN)
Application Number:
PCT/CN2021/091903
Publication Date:
November 18, 2021
Filing Date:
May 06, 2021
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
B21B19/04; C22C38/02; B21B19/10; B21B37/74; B21D3/00; B21D37/16; C21D1/18; C21D8/10; C22C38/04; C22C38/06; C22C38/22; C22C38/24; C22C38/26; C22C38/28; C22C38/32
Foreign References:
| CN1727510A | 2006-02-01 | |||
| CN109642293A | 2019-04-16 | |||
| CN1934279A | 2007-03-21 | |||
| CN1873041A | 2006-12-06 | |||
| CN103774063A | 2014-05-07 | |||
| JPH11131189A | 1999-05-18 | |||
| JPH0459941A | 1992-02-26 |
Attorney, Agent or Firm:
WATSON & BAND INTELLECTUAL PROPERTY AGENT LTD. (CN)
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