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Production method of steel plate for 36kg class offshore platform

An offshore platform and production method technology, applied in the direction of process efficiency improvement, etc., can solve the problems such as the thickness specification is limited to less than 40mm, the inability to meet the needs of thick-gauge steel plates, and the unfavorable low-temperature toughness of steel plates, so as to achieve the effect of improving comprehensive performance.

Active Publication Date: 2017-10-13
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The patent application number is 201210052011.5, in the patented technology of high toughness steel plate for marine engineering and its manufacturing method, using low carbon component design, using TMCP process to develop steel for offshore platforms, but the performance stability of TMCP process steel plate is poor, It is not as stable as the normalized steel plate. On the other hand, the product developed by this patent has a thinner specification, and the thickest is only 50mm.
[0004] The patent application number is 200810104297.0, which is named as the patented technology of vanadium-containing high-strength toughness medium-thick steel plate for hull and its production method. The steel plate for marine engineering is prepared by using the controlled rolling and controlled cooling process, but the content of V is too high, and the lower limit is 0.06%. , which is not conducive to the steel plate having good and stable low-temperature toughness, and the thickest steel plate developed by this patent is only 40mm
[0005] The patent application number is 201110103197.8, which is the patented technology of alloy reduced-weight ship plate steel with a yield strength of 355MPa and its preparation process. The comprehensive production cost is relatively low, but the thickness specification is also limited to within 40mm, which cannot meet the needs of thick steel plates.

Method used

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  • Production method of steel plate for 36kg class offshore platform
  • Production method of steel plate for 36kg class offshore platform
  • Production method of steel plate for 36kg class offshore platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Put the slab to be rolled after smelting and continuous casting into the heating furnace, the heating time is 260 minutes, and the soaking time is 60 minutes. The mass percentage of the chemical composition of the slab is: C 0.10%, Si 0.45%, Mn 1.60%, P 0.009%, S0.002%, Als 0.024%, Nb 0.040%, V 0.020%, Ti 0.017%, Ni 0.20%, Ce 5ppm, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 70 mm, the detailed rolling and heat treatment process is shown in Table 1, and its mechanical properties are shown in Table 2.

Embodiment 2

[0060] Put the slab to be rolled after smelting and continuous casting into the heating furnace, the heating time is 250 minutes, and the soaking time is 30 minutes. The mass percentage of the chemical composition of the slab is: C 0.13%, Si 0.34%, Mn 1.40%, P 0.012%, S0.003%, Als 0.027%, Nb 0.025%, V 0.030%, Ti 0.020%, Ni 0.31%, Ce 12ppm, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 80 mm, the detailed rolling and heat treatment process is shown in Table 1, and its mechanical properties are shown in Table 2.

[0061] Such as figure 1 As shown, it is the metallographic diagram at 1 / 4 of the finished steel plate thickness in embodiment 2 of the present invention; as figure 2 Shown is the metallographic diagram at 1 / 2 of the thickness of the finished steel plate in Example 2 of the present invention.

[0062] It can be seen from the figure that the structure of the steel plate is ferrite plus pearlite, the grains are uniform and...

Embodiment 3

[0064] Put the slab to be rolled after smelting and continuous casting into the heating furnace, the heating time is 330 minutes, and the soaking time is 47 minutes. The mass percentage of the chemical composition of the slab is: C 0.16%, Si 0.25%, Mn 1.20%, P 0.015%, S0.003%, Als 0.027%, Nb 0.025%, V 0.040%, Ti 0.010%, Ni 0.40%, Ce 18ppm, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 90 mm, the detailed rolling and heat treatment process is shown in Table 1, and its mechanical properties are shown in Table 2.

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Abstract

The invention discloses a production method of a steel plate for a 36Kg level ocean platform. The production method comprises the steps of smelting, continuous casting, plate blank reheating, scale removal, rough rolling, finish rolling, ACC (Accelerated Cooling System) cooling, hot straightening, shearing and heat treatment. Through rare earth microalloying treatment on the steel plate, the degree of purity of molten steel is controlled strictly, and with the adoption of a normalizing and tempering heat treatment technology, the comprehensive performance in the through-thickness direction of the 36Kg level thick steel plate for ocean engineering is improved greatly.

Description

technical field [0001] The invention relates to the technical field of medium and heavy plates, in particular to a production method of a 36Kg steel plate for offshore platforms. Background technique [0002] As my country continues to promote the marine strategy and the development of offshore oil and gas resources continues to increase, the demand for steel for fully mechanized marine mining equipment is also increasing. At present, the high-performance offshore platform steels used in large quantities are mainly 36Kg grade steel plates, which are mostly delivered in the normalized state, and the specifications are relatively thick. Steel for offshore platforms needs to have high strength, good low temperature toughness, good fatigue resistance, good lamellar tear resistance, good welding performance, etc. Especially for thick-gauge marine steel, the requirements for the structure and performance uniformity in the thickness direction of the steel plate are also getting hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/12C22C38/14C22C38/08C22C38/06
CPCC21D8/0226C21D8/0247C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14Y02P10/20
Inventor 刘泽田陆斌李浩王宏盛华国龙白永强
Owner INNER MONGOLIA BAOTOU STEEL UNION