High-performance ocean platform steel and its production method

An offshore platform and production method technology, which is applied in the field of steel plate manufacturing, can solve the problems of low low-temperature toughness and affect the use of steel plates, etc., and achieve the effects of high low-temperature impact energy, good structure, and guaranteed hardenability

Inactive Publication Date: 2012-10-17
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current strength and low temperature toughness of steel for offshore platforms are relatively small, which affects the use of such steel plates

Method used

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  • High-performance ocean platform steel and its production method
  • High-performance ocean platform steel and its production method

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Effect test

Embodiment 1

[0036] The thickness of the steel for the offshore platform of this embodiment is greater than 90mm, and the actual composition (by weight percentage) of the steel plate is: C: 0.10%, Si: 0.28%, Mn: 1.56%, P: 0.010%, S: 0.001%, Al :0.037%, Nb: 0.037%, V: 0.075%, Ti: 0.045%, the balance is Fe and inevitable impurities, Ceq is 0.40%, Pcm is 0.20%.

[0037] The production method of the steel plate of the present invention is as follows:

[0038] (1) Smelting: Molten steel is first smelted by an electric furnace. When the ladle is tapped, 1 ton of alloy is added, including the deoxidizer Si-Mn, to avoid the increase in the degree of overoxidation of the molten steel, and when the ladle is tapped, P must be less than 0.008%, slag tapping is not allowed; sent to LF refining furnace for refining, and fed with 650 meters of Al wire, 1720kg of lime, 123kg of Si-Fe powder, white slag maintained for 55min, vacuum treatment in VD furnace, 130kg of SiCa block added before vacuum Furnace, the v...

Embodiment 2

[0048] The thickness of the steel for the offshore platform of this embodiment is ≤40mm, and the actual composition (by weight percentage) of the steel plate is: C: 0.12%, Si: 0.27%, Mn: 1.48%, P: 0.009%, S: 0.001%, Al: 0.038%, Nb: 0.027%, V: 0.038%, the balance is Fe and unavoidable impurities, Ceq is 0.38%, Pcm is 0.21%.

[0049] The production method of the steel plate of the present invention is as follows:

[0050] (1) Smelting: Molten steel is first smelted by an electric furnace. When the ladle is tapped, 1 ton of alloy is added, including the deoxidizer Si-Mn, to avoid the increase in the degree of overoxidation of the molten steel, and when the ladle is tapped, P must be less than 0.008%, slag tapping is not allowed; sent to LF refining furnace for refining, and fed with 650 meters of Al wire, 1720kg of lime, 123kg of Si-Fe powder, white slag maintained for 55min, vacuum treatment in VD furnace, 130kg of SiCa block added before vacuum Furnace, the vacuum degree is 66 Pa, ...

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Abstract

The invention provides high-performance ocean platform steel and its production method. When the thickness of a steel plate is 8-40mm, the steel plate is composed of the following chemical components, by weight, 0.11-0.13% of C, 0.20-0.50% of Si, 1.45-1.55% of Mn, 0.012% or less of P, 0.003% or less of S, 0.035-0.045% of V, 0.025-0.030% of Nb, 0.050% or less of Ti, 0.020-0.050% of Al, and the balance Fe and inevitable impurities; and when thickness of a steel plate is 40-100mm, the steel plate is composed of the following chemical components, by weight, 0.10-0.12% of C, 0.20-0.50% of Si, 1.50-1.60% of Mn, 0.012% or less of P, 0.003% or less of S, 0.070-0.075% of V, 0.030-0.040% of Nb, 0.050% or less of Ti, 0.020-0.050% of Al, and the balance Fe and inevitable impurities. The production method of the steel plate of the invention comprises the steps of electric furnace smelting, LF furnace refining, VD vacuum treatment, continuous casting (or die casting), heating, control rolling, cooling, stacking, and normalizing to prepare the steel plate. Through a reasonable component design and process optimization, the steel plate of the invention has excellent mechanical performances, welding performances and processing performances, and has strong market competitiveness.

Description

Technical field [0001] The invention belongs to the technical field of steel plate manufacturing, and specifically relates to a high-performance offshore platform steel and a production method thereof. Background technique [0002] In the development of offshore oil and gas resources in my country, the marine engineering equipment manufacturing industry is a strategic industry that provides equipment for marine development. It is estimated that by 2020, the global offshore engineering equipment market investment will exceed 120 billion yuan, of which platform and offshore engineering ships will invest about 70 billion yuan, and deepwater equipment investment will account for more than 45%. Liwan, Lishui, Panyu Jutao, Shengbaowang and other projects are CNOOC South China Sea deep-water natural gas development projects, with recoverable reserves of 4-6 trillion cubic feet of natural gas, and are the first deep-water jack-up ocean independently developed and designed by my country P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14
Inventor 韦明李红文吕建会刘丹华小和胡丽周
Owner WUYANG IRON & STEEL
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