Maximum-thickness S355G10+N steel plate for ocean platform and production method of steel plate

A S355G10, offshore platform technology, applied in the field of structural steel plates for offshore engineering, to achieve the effects of high low-temperature impact energy, excellent mechanical properties, and no dirt

Active Publication Date: 2015-06-24
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main grades of steel for international offshore platforms are 355, 420, and 460 MPa. The

Method used

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  • Maximum-thickness S355G10+N steel plate for ocean platform and production method of steel plate
  • Maximum-thickness S355G10+N steel plate for ocean platform and production method of steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: The S355G10+N steel plate for the large-thickness offshore platform adopts the following composition ratio and production method.

[0033] The thickness of the S355G10+N steel plate is 150mm, and the composition content (wt) is: C 0.12%, Si 0.15%, Mn 1.63%, P 0.006%, S 0.001%, V 0.044%, Nb 0.028%, Al 0.047%, Ceq 0.40 %, Pcm 0.19%, the rest is Fe and unavoidable impurities.

[0034] The production method of this steel plate is as follows: (1) Casting process: the temperature is 1548°C after the vacuum is broken, and then the 33.4T flat ingot mold is used for casting, and the superheat is controlled at 40°C.

[0035] (2) Heating process: The heating process is as follows: according to the steel heating system of group II, the maximum heating temperature is 1239°C, the heating rate of steel ingots below 1000°C is 117°C / h, and the heating rate of ≥1000°C is not limited.

[0036] After the steel ingot is rolled into a billet, the billet needs to be heated and ...

Embodiment 2

[0041] Embodiment 2: This S355G10+N steel plate adopts the following composition ratio and production method.

[0042] The thickness of the S355G10+N steel plate is 130mm, and the composition content is (wt): C 0.08%, Si 0.48%, Mn 1.40%, P 0.014%, S 0.004%, V 0.060%, Nb 0.022%, Al 0.020%, Ceq 0.40 %, Pcm 0.19%, the rest is Fe and unavoidable impurities.

[0043] The production method of this steel plate is as follows: (1) Casting process: the temperature is 1546°C after the vacuum is broken, and then the 31.4T flat ingot mold is used for casting, and the superheat is controlled at 30°C.

[0044] (2) Heating process: According to the steel heating system of group II, the maximum heating temperature is 1231°C to ensure that the ingot is evenly burned through; the heating rate of the steel ingot below 1000°C is 109°C / h, and the heating rate above 1000°C is not limited.

[0045] After the steel ingot is rolled into a billet, the billet needs to be heated and rolled again in the f...

Embodiment 3

[0050] Embodiment 3: This S355G10+N steel plate adopts the following composition ratio and production method.

[0051] The thickness of the S355G10+N steel plate is 110mm, and the composition content (wt) is: C 0.10%, Si 0.35%, Mn 1.55%, P 0.010%, S 0.003%, V 0.045%, Nb 0.030%, Al 0.033%, Ceq 0.40 %, Pcm 0.19%, the rest is Fe and unavoidable impurities.

[0052] The production method of this steel plate is as follows: (1) Casting process: the temperature is kept at 1540°C after vacuum failure, and then cast with a 28T flat ingot mold, and the superheat is controlled at 20°C.

[0053] (2) Heating process: according to the steel heating system of group II, the maximum heating temperature is 1238°C, the heating rate of steel ingots below 1000°C is 112°C / h, and the heating rate of ≥1000°C is not limited.

[0054] After the steel ingot is rolled into a billet, the billet needs to be heated and rolled again in the furnace; the heating coefficient of the billet is 20min / cm, the maxi...

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Abstract

The invention discloses a maximum-thickness S355G10+N steel plate for an ocean platform and a production method of the maximum-thickness S355G10+N steel plate. The production method of the maximum-thickness S355G10+N steel plate comprises smelting, casting, heating, rolling, cooling and heat treatment processes. The maximum-thickness S355G10+N steel plate comprises the following chemical ingredients in percentage by weight: 0.08-0.12% of C, 0.15-0.50% of Si, 1.40-1.65% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.040-0.060% of V, 0.020-0.030% of Nb, 0.020-0.050% of Al, less than or equal to 0.43% of Cea, less than or equal to 0.22% of Pcm and the balance of Fe and inevitable impurities. The maximum-thickness S355G10+N steel plate has the advantages that low-carbon and high-microalloying design thought is adopted in composition design, the problem of segregation of carbon and manganese is solved, and the requirements such as high strength, high impact toughness and wide cold bending performance are met; hardenability of the maximum-thickness S355G10+N steel plate is guaranteed under the low-carbon and low-equivalent carbon content conditions, and the maximum-thickness S355G10+N steel plate has good structure and overall performance and welding performance; and the maximum-thickness S355G10+N steel plate has good mechanical properties, welding performance and processability and can meet requirements of construction technological conditions of an ocean engineering equipment manufacturing plant.

Description

technical field [0001] The invention relates to a structural steel plate for ocean engineering, in particular to a S355G10+N steel plate for large-thickness ocean 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%. At present, the main grades of steel for international offshore platforms are 355, 420, and 460 MPa. There is no special steel standard for offshore platforms in my country, and foreign standards are adopted. The steel used for platforms below EH36 is basic...

Claims

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Application Information

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IPC IPC(8): C22C38/12C21D8/02
Inventor 刘丹余景明宋庆吉谷盟森谢良法韦明叶建军
Owner WUYANG IRON & STEEL
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