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Extremely thick low-alloy high-strength steel plate for normalized ocean engineering equipment, and production method thereof

A technology for marine engineering and high-strength steel plates, which is applied in the field of metallurgy, can solve the problems that plague the production of extra-thick low-alloy high-strength steel plates, the mechanical properties of 1/2 of the plate thickness cannot meet the requirements of the mechanical properties of the plate thickness, etc., and achieve good anisotropy The effect of uniformity, shortening the production cycle, and uniform composition of steel ingots

Inactive Publication Date: 2018-12-07
WUYANG IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem that the mechanical properties of the 1 / 2 part of the plate thickness cannot meet the requirements of the mechanical properties of the 1 / 4 part of the plate thickness has long plagued the production of extra-thick low-alloy high-strength steel plates for normalized marine engineering equipment and has become an urgent problem to be solved

Method used

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  • Extremely thick low-alloy high-strength steel plate for normalized ocean engineering equipment, and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] In this example, the steel type EH36 of the extra-thick low-alloy high-strength steel plate used for normalizing marine engineering equipment, the thickness of the steel plate is 220mm, and its chemical composition and mass percentage are: C: 0.16%, Si: 0.28%, Mn: 1.50 %, P: 0.011%, S: 0.001%, Ni: 0.16%, Nb: 0.029%, TAl: 0.049%, V: 0.048%, Ceq: 0.44%, and the balance is Fe and unavoidable impurities.

[0020] The production method of the extra-thick low-alloy high-strength steel plate for normalized marine engineering equipment in this embodiment includes smelting, die casting, steel ingot cleaning, stacking and slow cooling, heating, rolling, and heat treatment. The specific process steps are as follows:

[0021] (1) Smelting process: The molten steel is smelted in an electric furnace first, and then sent to the LF refining furnace for refining and adjusting the composition. When the temperature of the molten steel reaches 1560°C, it is transferred to a vacuum degassing...

Embodiment 2

[0030] In this example, the steel type EH36 of the extra-thick low-alloy high-strength steel plate used for normalizing marine engineering equipment, the thickness of the steel plate is 210mm, and its chemical composition and mass percentage are: C: 0.15%, Si: 0.30%, Mn: 1.49 %, P: 0.010%, S: 0.003%, Ni: 0.18%, Nb: 0.030%, TAl: 0.040%, V: 0.045%, Ceq: 0.45%, and the balance is Fe and unavoidable impurities.

[0031] The production method of the extra-thick low-alloy high-strength steel plate for normalized marine engineering equipment in this embodiment includes smelting, die casting, steel ingot cleaning, stacking and slow cooling, heating, rolling, and heat treatment. The specific process steps are as follows:

[0032] (1) Smelting process: The molten steel is smelted in an electric furnace first, and then sent to the LF refining furnace for refining and adjusting the composition. When the temperature of the molten steel reaches 1545°C, it is transferred to a vacuum degassing...

Embodiment 3

[0041] In this example, the steel grade EH36 of the extra-thick low-alloy high-strength steel plate used for normalizing marine engineering equipment, the thickness of the steel plate is 200mm, and its chemical composition and mass percentage are: C: 0.15%, Si: 0.35%, Mn: 1.45 %, P: 0.015%, S: 0.005%, Ni: 0.20%, Nb: 0.025%, TAl: 0.050%, V: 0.040%, Ceq: 0.46%, and the balance is Fe and unavoidable impurities.

[0042] The production method of the extra-thick low-alloy high-strength steel plate for normalized marine engineering equipment in this embodiment includes smelting, die casting, steel ingot cleaning, stacking and slow cooling, heating, rolling, and heat treatment. The specific process steps are as follows:

[0043] (1) Smelting process: the molten steel is smelted in an electric furnace first, and then sent to the LF refining furnace for refining and adjusting the composition. When the temperature of the molten steel reaches 1550°C, it is transferred to a vacuum degassin...

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Abstract

The invention discloses an extremely thick low-alloy high-strength steel plate for normalized ocean engineering equipment, and a production method thereof. The steel plate is prepared from the chemical components in percentage by mass: 0.15 to 0.17 percent of C, 0.25 to 0.35 percent of Si, 1.45 to 1.55 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent ofS, 0.15 to 0.20 percent of Ni, 0.025 to 0.035 percent of Nb, 0.020 to 0.050 percent of TAl, 0.040 to 0.050 percent of V, 0.42 to 0.46 percent of Ceq, and the balance Fe and inevitable impurities. Theproduction method comprises the processes of smelting, die casting, clearing a steel ingot, stacking for slow cooling, heating, rolling, and carrying out heat treatment. The steel plate provided by the invention meets the requirement of the low-alloy extremely thick steel plate for a large-scale ocean platform base, and the production method is simple in process, easy to operate, high in yield, and suitable for the production in all qualified thick plate plants.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an extra-thick low-alloy high-strength steel plate for normalizing ocean engineering equipment and a production method thereof. Background technique [0002] In recent years, with the development of energy resources and the development of the marine field, the structure of marine development equipment has also become larger, and its requirements for steel plates have become more and more stringent, especially for the strength, toughness, welding performance and thickness of extra-thick plates. Directional performance requirements are higher. [0003] The problem that the mechanical properties of the 1 / 2 part of the plate thickness cannot meet the requirements of the mechanical properties of the 1 / 4 part of the plate thickness has plagued the production of extra-thick low-alloy high-strength steel plates for normalized marine engineering equipment for a long time, a...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C22C38/06C21C7/064C21C7/10C21D1/28C21D8/02
CPCC22C38/02C21C7/064C21C7/10C21D1/28C21D8/0226C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 李杰张伟军吕建会张朋庞辉勇龙杰郭恒斌任鑫磊张亚丽张西忠贺霄
Owner WUYANG IRON & STEEL