Title:
SEAMLESS STEEL TUBE RESISTANT TO CARBON DIOXIDE CORROSION AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/242742
Kind Code:
A1
Abstract:
Disclosed in the present invention is a high-strength seamless steel tube resistant to carbon dioxide corrosion. In addition to containing Fe and inevitable impurities, the seamless steel tube further contains the following chemical elements, in percentage by mass: C: 0.05-0.18%, Si: 0.15-0.40%, Mn: 0.25-0.50%, Cr: 4.0-6.0%, Mo: 0.08-0.35%, Al: 0.020-0.055%, Ca: 0.001-0.004%; and one or more selected from Ti, Nb, V, Ce and La, wherein 0.003％ ≤ Ti+Nb+V+Ce+La ≤ 0.20％. Also disclosed in the present invention is a method for manufacturing the seamless steel tube. The method comprises the following steps: (1) manufacturing a tube blank; (2) subjecting the tube blank to heating, perforating, hot rolling and sizing to obtain a hot-rolled tube; and (3) subjecting the hot-rolled tube to a quenching and tempering heat treatment, involving: quenching same and maintaining the temperature within a temperature range of 860-940ºC for 15-120 min, and then tempering same and maintaining the temperature within a temperature range of 520-620ºC for 30-150 min.
Inventors:
LUO SUZHEN (CN)
QI YAMENG (CN)
ZHANG ZHONGHUA (CN)
QI YAMENG (CN)
ZHANG ZHONGHUA (CN)
Application Number:
PCT/CN2022/094085
Publication Date:
November 24, 2022
Filing Date:
May 20, 2022
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; C21D8/10; C22C38/04; C22C38/06; C22C38/18; C22C38/22; C22C38/24; C22C38/26; C22C38/28
Foreign References:
| CN104451394A | 2015-03-25 | |||
| CN104846279A | 2015-08-19 | |||
| CN107151758A | 2017-09-12 | |||
| CN103147006A | 2013-06-12 | |||
| CN102373386A | 2012-03-14 | |||
| CN109423573A | 2019-03-05 | |||
| JP2017020086A | 2017-01-26 | |||
| JP2015193868A | 2015-11-05 |
Attorney, Agent or Firm:
WATSON & BAND INTELLECTUAL PROPERTY AGENT LTD. (CN)
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