S460G2+QT steel plate for fixed offshore platform and production method of steel plate

An offshore platform and production method technology, which is applied in the field of steelmaking production, can solve the problems of large amount of alloy addition, low-temperature toughness of steel plates that cannot meet the standard requirements, and high production costs, and achieve high toughness, excellent weldability, and excellent performance. Effect

Active Publication Date: 2015-04-22
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the S460G2+QT steel plate is produced according to the previous method, the carbon equivalent Ceq and the crack sensitivity coefficient Pcm value will exceed the standard requirements; and due to the large amount of alloy added, the production cost is high; moreover, the previous rolling and subsequent heat treatment methods will cause steel plate low temperature Toughness and other properties will not meet the standard requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: The S460G2+QT steel plate for the fixed offshore platform is produced by the following process.

[0018] (1) Smelting: use electric arc furnace for smelting, and then send it to LF refining furnace for refining and adjust the composition. The total refining time is 55 minutes, and then transfer to vacuum degassing furnace for vacuum treatment, and the vacuum holding time is 15 minutes.

[0019] (2) Continuous casting: The molten steel after smelting is continuously cast, the liquidus temperature Tll=1519.6°C, the superheat is controlled at 20°C±5°C, and a 330mm thick continuous casting slab is obtained; its chemical composition (by weight percentage) is: C 0.09%, Si 0.29%, Mn 1.50%, P 0.015%, S 0.002%, Cr 0.20%, Mo 0.01%, Ni 0.35%, Al 0.044%, Cu 0.01%, N 0.0042%, Nb 0.040%, Ti 0.002 %, V 0.050%, the rest is Fe and unavoidable residual elements and impurities.

[0020] (3) Heating: The continuous casting slab is heated in a continuous heating furnace, the ...

Embodiment 2

[0027] Embodiment 2: The S460G2+QT steel plate used for the fixed offshore platform is produced by the following process.

[0028] (1) Smelting: use electric arc furnace for smelting, and then send it to LF refining furnace for refining and adjust the composition. The total refining time is 55 minutes, and then transfer to vacuum degassing furnace for vacuum treatment, and the vacuum holding time is 15 minutes.

[0029] (2) Continuous casting: The molten steel after smelting is continuously cast, the liquidus temperature Tll=1519.6°C, the superheat is controlled at 20°C±5°C, and a 330mm thick continuous casting slab is obtained; its chemical composition (by weight percentage) is: C 0.10%, Si 0.29%, Mn 1.40%, P 0.014%, S 0.002%, Cr 0.15%, Mo 0.01%, Ni 0.35%, Al 0.025%, Cu 0.01%, N 0.0035%, Nb 0.040%, Ti 0.002 %, V 0.050%, the rest is Fe and unavoidable residual elements and impurities.

[0030] (3) Heating: The continuous casting slab is heated in a continuous heating furnace,...

Embodiment 3

[0037]Embodiment 3: The S460G2+QT steel plate for the fixed offshore platform is produced by the following process.

[0038] (1) Smelting: use electric arc furnace for smelting, and then send it to LF refining furnace for refining and adjust the composition. The total refining time is 55 minutes, and then transfer to vacuum degassing furnace for vacuum treatment, and the vacuum holding time is 15 minutes.

[0039] (2) Continuous casting: The molten steel after smelting is continuously cast, the liquidus temperature Tll=1520.8°C, the superheat is controlled at 20°C±5°C, and a 330mm thick continuous casting slab is obtained; its chemical composition (by weight percentage) is: C 0.08%, Si 0.31%, Mn 1.40%, P 0.013%, S 0.002%, Cr 0.15%, Mo 0.01%, Ni 0.30%, Al 0.035%, Cu 0.02%, N 0.0061%, Nb 0.040%, Ti 0.001 %, V 0.050%, the rest is Fe and unavoidable residual elements and impurities.

[0040] (3) Heating: The continuous casting slab is heated in a continuous heating furnace, the m...

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Abstract

The invention discloses an S460G2+QT steel plate for a fixed offshore platform and a production method of the steel plate. The production method comprises the following process steps: smelting, continuous casting, heating, rolling, cooling, quenching and tempering, wherein the continuous casting billet obtained in the continuous casting process comprises the following chemical components in percentage by mass: 0.08-0.10 percent of C, 0.20-0.50 percent of Si, 1.40-1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.15-0.20 percent of Cr, less than or equal to 0.25 percent of Mo, 0.30-0.35 percent of Ni, 0.020-0.045 percent of Al, less than or equal to 0.10 percent of Cu, less than or equal to 0.008 percent of N, 0.035-0.040 percent of Nb, less than or equal to 0.025 percent of Ti, 0.040-0.050 percent of V and the balance of Fe and inevitable residual elements and impurities. According to the method, low-cost chemical components and a quenching and tempering process with low energy and time consumption are adopted, so that the S460G2+QT steel plate with the advantages of high strength, high toughness, fatigue resistance, lamination crack resistance and excellent weldability is produced.

Description

technical field [0001] The invention belongs to the technical field of steelmaking production, in particular to a S460G2+QT steel plate for fixing an offshore platform and a production method thereof. Background technique [0002] With the strengthening of my country's national strength, large-scale offshore oil production platforms have developed rapidly. During the "Twelfth Five-Year Plan" period, offshore deepwater oilfield exploitation has become the key development direction of my country's offshore oilfields. Offshore platforms are special places for operations on the ocean. The service life of offshore platforms is 50% longer than that of ships. The steel plates used must have high strength, high toughness, fatigue resistance, lamellar tear resistance, good weldability and seawater resistance. corrosion etc. S460G2+QT is the highest grade steel specified in EN10225-2009 "Technical Supply Conditions of Weldable Structural Steel for Fixed Offshore Structures". Compare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/48C22C33/04
Inventor 罗应明刘利香林明新王九清庞辉勇吴涛尚建雄车金锋肖春江赵喜伟张东方
Owner WUYANG IRON & STEEL
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