Title:
PIPELINE STEEL HAVING EXCELLENT ACID RESISTANCE PROPERTY, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/103514
Kind Code:
A1
Abstract:
The present invention provides acid-resistant pipeline steel and a manufacturing method therefor. The manufacturing method comprises: performing a pre-desulfurization treatment on molten iron by means of a mechanical stirring method, so that the mass percentage of S in the molten iron is less than or equal to 0.0020%; adding, according to design of compositions, corresponding metals to the molten iron for converter smelting, and controlling the mass percentage of S in molten steel to be less than or equal to 0.0020% and the mass percentage of P to be less than or equal to 0.018%; in a tapping process, adding silicon-manganese, aluminum ingot, micro-carbon ferrochromium, ferro-molybdenum alloy, and lime, so that the mass percentage of Mn in the molten steel is less than or equal to 0.90%, the mass percentage of C is less than or equal to 0.06%, and the sum of the mass percentages of Cr and Mo is greater than or equal to 0.40%; performing ladle refining and RH vacuum treatments, so that the mass percentage of Nb in the molten steel to be greater than or equal to 0.060%, the mass percentage of Ti is greater than or equal to 0.010%, and the sum of the mass percentages of Nb and Ti is greater than or equal to 0.085%; feeding a Ca wire to the molten steel for soft stirring, a superheating degree of casting being no lower than 30°C; and forming a steel plate. The manufacturing method is economical in compositions and facilitates smelting and production.
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Inventors:
NIE WENJIN (CN)
LIN TAOZHU (CN)
BAO DEZHI (CN)
DING XUYAN (CN)
LI RAN (CN)
ZHANG JIMING (CN)
LIN TAOZHU (CN)
BAO DEZHI (CN)
DING XUYAN (CN)
LI RAN (CN)
ZHANG JIMING (CN)
Application Number:
PCT/CN2022/119356
Publication Date:
June 15, 2023
Filing Date:
September 16, 2022
Export Citation:
Assignee:
JIANGSU SHAGANG GROUP CO LTD (CN)
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD (CN)
INSTITUTE OF RES OF IRON AND STEEL JIANGSU PROVINCE/SHA STEEL CO LTD CN (CN)
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD (CN)
INSTITUTE OF RES OF IRON AND STEEL JIANGSU PROVINCE/SHA STEEL CO LTD CN (CN)
International Classes:
C22C38/02; C21D8/02; C22C33/06; C22C38/04; C22C38/06; C22C38/20; C22C38/22; C22C38/26; C22C38/28; C22C38/42; C22C38/44; C22C38/48; C22C38/50
Foreign References:
| CN114318140A | 2022-04-12 | |||
| CN109023069A | 2018-12-18 | |||
| CN107974622A | 2018-05-01 | |||
| CN111842489A | 2020-10-30 | |||
| CN108728731A | 2018-11-02 | |||
| JP2001064749A | 2001-03-13 |
Attorney, Agent or Firm:
NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD (CN)
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