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Steel for large-thickness hardening and tampering ocean platform and production method thereof

An offshore platform and production method technology, applied in the field of steel smelting, can solve the problems of high price and small thickness, and achieve the effects of low cost, stable steel performance and high steel plate strength

Inactive Publication Date: 2010-05-19
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current thickness of steel used for offshore platforms is relatively small, generally no more than 100mm, and there is a problem of high price

Method used

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  • Steel for large-thickness hardening and tampering ocean platform and production method thereof
  • Steel for large-thickness hardening and tampering ocean platform and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Large-thickness quenched and tempered offshore platform steel, its composition mass percentage is: C: 0.18%, Si: 0.28%, Mn: 1.13%, P: 0.010%, S: 0.003%, Ni: 1.35%, Cr: 1.21% , Cu: 0.07%, Mo: 0.47%, Nb: 0.033%, Ti: 0.023%, V: 0.055%, Al: 0.04%, B: 0.0020%, and the rest are Fe and unavoidable impurities.

[0031] A method for producing large-thickness quenched and tempered steel for offshore platforms, comprising the following steps:

[0032] (1) Smelting process: The molten steel containing the above ingredients is smelted in an electric furnace and then sent to an LF refining furnace for refining. After refining, vacuum treatment is carried out in a VD furnace with a vacuum degree of 0.5 Torr, and the vacuum is broken when the vacuum is kept for 25 minutes;

[0033] (2) Casting process: after the vacuum is broken, the temperature is kept at 1330-1340°C, and the casting is carried out;

[0034] (3) Heating process: low-speed steel burning, heating rate below 1000°C is 1...

Embodiment 2

[0039] Large-thickness quenched and tempered offshore platform steel, its composition mass percentage is: C: 0.16%, Si: 0.35%, Mn: 1.10%, P: 0.009%, S: 0.003%, Ni: 1.40%, Cr: 1.20% , Cu: 0.10%, Mo: 0.55%, Nb: 0.04%, Ti: 0.020%, V: 0.06%, Al: 0.02%, B: 0.0023%, and the rest are Fe and unavoidable impurities.

[0040] A method for producing large-thickness quenched and tempered steel for offshore platforms, comprising the following steps:

[0041] (1) Smelting process: The molten steel containing the above components is smelted in an electric furnace and then sent to an LF refining furnace for refining. After refining, vacuum treatment is carried out in a VD furnace with a vacuum degree of 0.4 Torr, and the vacuum is broken when the vacuum is maintained for 15 minutes;

[0042] (2) Casting process: after the vacuum is broken, the temperature is kept at 1330-1340°C, and the casting is carried out;

[0043] (3) Heating process: low-speed steel burning, heating rate below 1000°C i...

Embodiment 3

[0048] Large-thickness quenched and tempered offshore platform steel, its composition mass percentage is: C: 0.16%, Si: 0.15%, Mn: 1.15%, P: 0.009%, S: 0.002%, Ni: 1.30%, Cr: 1.30% , Cu: 0.05%, Mo: 0.45%, Nb: 0.030%, Ti: 0.025%, V: 0.05%, Al: 0.03%, B: 0.0014%, and the rest are Fe and unavoidable impurities.

[0049] A method for producing large-thickness quenched and tempered steel for offshore platforms, comprising the following steps:

[0050] (1) Smelting process: The molten steel containing the above ingredients is smelted in an electric furnace and then sent to the LF refining furnace for refining. After refining, it is vacuum treated in the hanging bag VD furnace, and SiCa blocks are added before the vacuum. The amount of SiCa is 0.7kg / ton of steel. The vacuum degree is 0.4 Torr, and the vacuum is broken when the vacuum is maintained for 20 minutes;

[0051] (2) Casting process: after the vacuum is broken, the temperature is kept at 1330-1340°C, and the casting is carr...

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Abstract

The invention discloses steel for a large-thickness hardening and tampering ocean platform, comprising the following components: 0.16 to 0.18 wt% of C, 0.15 to 0.35 wt% of Si, 1.10 to 1.15 wt% of Mn, no more than 0.015 wt% of P, no more than 0.005 wt% of S, 1.30 to 1.40 wt% of Ni, 1.20 to 1.30 wt% of Cr, 0.05 to 0.10 wt% of Cu, 0.45 to 0.55 wt% of Mo, 0.03 to 0.04 wt% of Nb, 0.020 to 0.025 wt% of Ti, 0.05 to 0.06 wt% of V, 0.02 to 0.04 wt% of Al, 0.0014 to 0.0023 wt% of B and balance of Fe and inevitable impurities. The production method comprises the steps of smelting, casting, heating, rolling, hardening, tempering and cutting to obtain a final product steel plate. The produced steel plate has reasonable design of the chemical components, low cost, large thickness (reaching 152mm), high strength, favorable impact toughness and favorable welding performance, and passes the factory certifications of DNV and CCS Classification Societies. The production process of the steel plate is simple and easy to operate, and the performance of each batch of steel is stable.

Description

technical field [0001] The invention belongs to the technical field of steel smelting, and in particular relates to a large-thickness quenched and tempered steel for offshore platforms and a production method thereof. Background technique [0002] The offshore platform is a super-large welded steel structure for the development of marine resources. It is used in severe marine working environments such as waves, tides, storms and cold drift ice to support platforms and drilling equipment with a total weight of more than hundreds of tons. These usage characteristics determine that the steel used for offshore platforms must have high strength, high toughness and good weldability. The current thickness of steel used for offshore platforms is relatively small, generally no more than 100mm, and there is a problem of high price. Contents of the invention [0003] The object of the present invention is to provide a large-thickness quenched and tempered steel for offshore platform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C21D8/02C21D1/18C21D11/00
Inventor 叶建军崔强刘建磊白永强王祥田苗
Owner WUYANG IRON & STEEL
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