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Extremely-thick low alloy steel plate for E-level high purity ocean platform and production method thereof

A technology of offshore platform and production method, which is applied in the field of metallurgy, can solve the problems of thickness level not meeting the user's requirements, unevenness, and small margin, etc., and achieve good comprehensive mechanical properties and welding performance, high purity, and main The effect of little change in composition

Inactive Publication Date: 2015-10-21
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Wugang has developed a 300mm EH36 steel plate, but its thickness level has not met the user's requirements, and the developed 420mm F36 steel plate, although its -40℃ low temperature impact toughness meets the user's requirements, it basically does not reach 100J, but The amount of wealth is not large and uneven

Method used

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  • Extremely-thick low alloy steel plate for E-level high purity ocean platform and production method thereof

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Effect test

Embodiment 1

[0036] The steel grade EH36 of present embodiment, steel plate thickness is 350mm, and the step of production method is as follows:

[0037] (1) Smelting: It will contain the following weight percentages C: 0.16%, Si: 0.30%, Mn: 1.39%, P: 0.014%, S: 0.001%, Al: 0.018%, Nb: 0.026%, V: 0.052%, Ti: The molten steel with 0.001% composition is smelted in electric furnace first, and then sent to LF refining furnace for refining. When the temperature of molten steel reaches 1620℃, it is transferred to VD furnace for vacuum degassing treatment. Before VD, 100kg / furnace of CaSi block is added to change the shape of inclusions; The vacuum degree of the VD furnace is 57Pa, and the vacuum holding time is 20 minutes to ensure the effective removal of inclusions and gases and the purity of molten steel;

[0038] (2) Continuous casting: low-carbon mold slag is used, the billets are off-line and stacked for 24 hours, cleaned with temperature, transferred to an electroslag remelting furnace to...

Embodiment 2

[0050] The steel grade EH36 of present embodiment, steel plate thickness is 330mm, and the step of production method is as follows:

[0051] (1) Smelting: will contain the following weight percentages C: 0.18%, Si: 0.35%, Mn: 1.60%, P: 0.014%, S: 0.001%, Al: 0.010%, Nb: 0.020%, V: 0.065%, Ti: The molten steel with 0.001% composition is smelted in electric furnace first, and then sent to LF refining furnace for refining. When the temperature of molten steel reaches 1640℃, it is transferred to VD furnace for vacuum degassing treatment. Before VD, add CaSi block 120kg / furnace to change the shape of inclusions; The vacuum degree of the VD furnace is 61Pa, and the vacuum holding time is 30 minutes to ensure the effective removal of inclusions and gases and the purity of molten steel;

[0052] (2) Continuous casting: low-carbon mold slag is used, the billets are off-line and stacked for 26 hours, cleaned with temperature, transferred to an electroslag remelting furnace to make bille...

Embodiment 3

[0062] The steel grade EH36 of present embodiment, steel plate thickness is 300mm, and the step of production method is as follows:

[0063] (1) Smelting: will contain the following weight percentages C: 0.10%, Si: 0.15%, Mn: 0.90%, P: 0.015%, S: 0.002%, Al: 0.020%, Nb: 0.030%, V: 0.035%, Ti: The molten steel with 0.002% composition is smelted in an electric furnace first, and sent to an LF refining furnace for refining. When the temperature of the molten steel reaches 1630°C, it is transferred to a VD furnace for vacuum degassing treatment. Before VD, 110kg / furnace of CaSi block is added to change the shape of inclusions; The vacuum degree of the VD furnace is 66.6Pa, and the vacuum holding time is 22 minutes to ensure the effective removal of inclusions and gases and the purity of molten steel;

[0064] (2) Continuous casting: low-carbon mold slag is used, the billets are off-line and stacked for 25 hours, cleaned with temperature, transferred to an electroslag remelting fur...

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Abstract

The invention discloses an extremely-thick low alloy steel plate for an E-level high purity ocean platform and further relates to a production method of the steel plate. The steel plate comprises, by weight, 0.10%-0.18% of C, 0.15%-0.35% of Si, 0.90%-1.60% of Mn, 0-0.02% of P, 0-0.005% of S, 0.020%-0.030% of Nb, 0.010%-0.080% of Al, 0.035%-0.065% of V, 0-0.025% of Ti, and the balance Fe and inevitable impurities. The production method of the steel plate includes the following steps of electric furnace smelting, LF / VD refining, continuous casting, electroslag remelting, steel ingot heating, rolling, water cooling after rolling, heat stacking, heat treatment and finished product obtaining. The maximum thickness of the steel plate obtained through the method can reach 350 mm, and the characteristics of being good in welding property, excellent in low temperature impact toughness and good in thickness directional property are achieved. Meanwhile, steel is clean, performance evenness is good, high flaw detection and performance requirements can be met, and a wide application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an extra-thick low-alloy steel plate for an E-grade high-purity ocean platform and a production method thereof. Background technique [0002] Extra-thick low-alloy steel plates for E-grade high-purity offshore platforms have higher requirements on the quality and performance of metal materials, especially the mechanical properties, welding properties and Z-direction properties of steel materials, which have exceeded all ship grades. However, ordinary smelting and casting methods cannot meet the needs, especially in terms of internal quality. After adopting electroslag remelting, the structure is dense, the steel is clean, and the performance is uniform, which can meet the high flaw detection and performance requirements. [0003] Wugang has developed a 300mm EH36 steel plate, but its thickness level has not met the user's requirements, and the developed 420mm F36 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 张亚丽李建立韦明叶建军郭恒斌桑德广张朋陈起
Owner WUYANG IRON & STEEL
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