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A steel plate for offshore platforms with excellent performance in the thickness direction of 60mm and its production method

An offshore platform, technology in the thickness direction, applied in the manufacture of converters, etc., can solve the problems of long time, complicated process, high cost, etc., and achieve the effect of refining grains, reducing segregation, and excellent performance

Inactive Publication Date: 2017-06-23
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the patent application whose application number is 201310154636.7 discloses a 355MPa grade easy-to-weld steel plate for offshore platforms and its production process. Expensive, high cost, no cost advantage
[0006] In the existing converter smelting process, the double slag method is used for dephosphorization, the process is complicated, the time is long, and the content of components is not easy to control during the operation

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The steel plate for offshore platforms with excellent performance in the thickness direction of 60 mm includes the following chemical components in mass percentage: C 0.13%, Si 0.25%, Mn 1.41%, P 0.015%, S 0.004%, Nb 0.058%, Ti 0.017%, Als0 .035%, the balance is Fe and unavoidable impurities.

[0025] The production method of the steel plate for the offshore platform comprises the following steps:

[0026] (1) KR pretreatment: After KR pretreatment, the mass percentage of S in the molten iron entering the converter is 0.006%;

[0027] (2) Converter smelting: In the process of converter smelting, the single slag method is used to dephosphorize, and then the slag is blocked to tap the steel;

[0028] (3) LF refining: Bottom-blown argon stirring during the LF refining process, white slag operation, LF refining time is 12 minutes, and FeTi is added out of the station;

[0029] (4) RH refining: During the RH refining process, keep the vacuum below 2mbar for 15 minutes;

...

Embodiment 2

[0042] The steel plate for offshore platforms with excellent performance in the thickness direction of 60mm includes the following chemical components in mass percentage: C 0.11%, Si 0.32%, Mn 1.47%, P 0.012%, S 0.003%, Nb 0.052%, Ti 0.015%, Als0 .037%, the balance is Fe and unavoidable impurities.

[0043] The production method of the steel plate for the offshore platform comprises the following steps:

[0044] (1) KR pretreatment: After KR pretreatment, the mass percentage of S in the molten iron entering the converter is 0.004%;

[0045] (2) Converter smelting: In the process of converter smelting, the single slag method is used to dephosphorize, and then the slag is blocked to tap the steel;

[0046] (3) LF refining: Bottom-blown argon stirring during the LF refining process, white slag operation, LF refining time 13 minutes, adding FeTi out of the station;

[0047] (4) RH refining: During the RH refining process, keep the vacuum below 2mbar for 12 minutes;

[0048] (5)...

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Abstract

The invention belongs to the technical field of structural steels for ship and ocean engineering, and particularly relates to a 60mm steel plate with excellent performance in a thickness direction for an ocean platform and a production method thereof. The 60mm steel plate with excellent performance in the thickness direction for the ocean platform comprises the following chemical components by mass percent: 0.09-0.14% of C, 0.20-0.50% of Si, 1.10-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.030-0.060% of Nb, 0.010-0.020% of Ti, 0.015-0.050% of Als, the balance of Fe, and inevitable impurities. The steel plate has excellent performances in the thickness direction, steelmaking production adopts a single slag process, and the production method is simple and feasible.

Description

technical field [0001] The invention belongs to the technical field of structural steel for ships and ocean engineering, and in particular relates to a steel plate for an ocean platform with excellent performance in the thickness direction of 60 mm and a production method thereof. Background technique [0002] With the continuous development of the global economy, the demand for energy at home and abroad continues to grow, especially the demand for oil and natural gas, which has increased dramatically. While the supply of land resources is decreasing day by day, countries all over the world pay great attention to the development and utilization of marine energy, and the construction of ocean platforms has been paid more and more attention. Performance requirements are getting higher and higher. [0003] 60mm thick steel plates for offshore platforms are mostly used in key parts such as jackets of jack-up offshore platforms. They are used in underwater service for a long tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/04C21C1/02C21C5/28C21C7/072C21D8/02
Inventor 李旺生孙风晓徐洪庆王焕洋李敏王勇朱延山
Owner JIGANG GRP
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