High-performance ocean platform steel and its production method

An offshore platform, high-performance technology, applied in the field of steel plate manufacturing, can solve the problems of low low temperature toughness, affecting the use of steel plates, etc., to achieve the effect of high low temperature impact energy, good structure, and ensure hardenability

Inactive Publication Date: 2015-01-07
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The thickness of the steel for offshore platforms in this embodiment is greater than 90 mm, 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 unavoidable impurities, Ceq is 0.40%, and Pcm is 0.20%.

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

[0038](1) Smelting: The molten steel is first smelted in an electric furnace. When tapping the ladle, add 1 ton of the alloy, including the deoxidizer Si-Mn, to avoid the increase in the degree of overoxidation of the molten steel, and when tapping the ladle, P must be less than 0.008%, it is not allowed to see slag to produce steel; send it to LF refining furnace for refining, and feed 650 meters of Al wire, 1720kg of lime, 123kg of Si-Fe powder, keep white slag for 55min, vacuum treatment in VD furnace, add SiCa block 130kg / Furnace, the vacu...

Embodiment 2

[0048] The thickness of the steel for the offshore platform in 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%, and Pcm is 0.21%.

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

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

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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 manufacture, and in particular relates to a high-performance steel for offshore platforms 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 investment in the global marine engineering equipment market will exceed 120 billion yuan, of which the investment in platforms and marine engineering vessels will be about 70 billion yuan, and the investment in deep-water equipment will account for more than 45%. Liwan, Lishui, Panyu Jutao, Shengbaowang and other projects are CNOOC deepwater natural gas development projects in the South China Sea, with recoverable reserves of 4 to 6 trillion cubic feet of natural gas. It is the first deepwater jack-up marine independ...

Claims

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Application Information

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Patent Type & Authority Patents(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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