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Sea water corrosion resistant steel for ocean drilling/production platform and preparation method thereof

A technology of corrosion performance and manufacturing method, which is applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of damaging the impact toughness and welding performance of steel, and achieve good surface quality, excellent seawater corrosion resistance, and good welding performance effect

Inactive Publication Date: 2007-02-07
武钢集团有限公司
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Problems solved by technology

[0006] Another Japanese patent (application number: 163544) introduces a kind of structural steel with excellent seawater corrosion resistance and its manufacturing method. 0.5% Sb, although these elements are beneficial to improve seawater resistance, they will seriously damage the impact toughness and welding performance of steel, which should be avoided as much as possible for offshore platform steel

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  • Sea water corrosion resistant steel for ocean drilling/production platform and preparation method thereof
  • Sea water corrosion resistant steel for ocean drilling/production platform and preparation method thereof
  • Sea water corrosion resistant steel for ocean drilling/production platform and preparation method thereof

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Embodiment Construction

[0023] The specific chemical composition of the steel of the present invention is by weight percentage: C≤0.09, Mn: 0.90~1.60, Si≤0.50, P≤0.020, Cr≤0.10, Cu≤0.40, Als: 0.010~0.060, Nb: 0.005~0.060, Ti: 0.005~0.030, S≤0.010, Ni: 0.10~0.40, Mo: 0.10~0.40, the rest is Fe and unavoidable impurities; at the same time meet: carbon equivalent Ceq≤0.40%, welding cold crack sensitivity coefficient Pcm≤0.18 %. The reason for this is explained below.

[0024] C content: In order to reduce the amount of pearlite and band structure, improve the seawater resistance and welding performance, the less the C content, the better. However, because it is the cheapest solid solution strengthening element, the upper limit is 0.09%.

[0025]Mn content: Mn is an economical main strengthening element, solid solution in ferrite causes obvious solid solution strengthening effect, too low ferrite strengthening is insufficient, too high (such as greater than 1.8-2.0%) has a negative effect on steel plasti...

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Abstract

the invention discloses a marine exploiting platform steel of erosion property of sea water resistance, which comprises the following parts: 0.03-0.09% C, 0.90-1.60% Mn, 0.10-0.50% Si, 0.006-0.020% P, 0.004-0.100% Cr, 0.02-0.40% Cu, 0.010-0.060% Als, 0.005-0.060% Nb, 0.005-0.030% Ti, Fe and impurity. the manufacturing method comprises the following steps: desulfurizing; blowing; disposing through vacuum; casting continually; rolling.

Description

technical field [0001] The invention relates to the field of low-alloy steel manufacturing, in particular to a steel for offshore drilling platforms with excellent seawater corrosion resistance and a manufacturing method thereof. Background technique [0002] At present, low-alloy high-strength hull steels such as E32 and E36 are generally used to manufacture offshore platforms at home and abroad, but the seawater resistance is inferior to corrosion resistance. With the gradual development of offshore oil exploitation from offshore to deep sea, the structure scale of offshore drilling and production platforms is getting larger and larger, the technology is becoming more and more complex, and the manufacturing cost is getting higher and higher. Therefore, people hope that their service life will be increased from the previous 15 years. For more than 50 years, the seawater corrosion resistance of offshore platform steel structure materials has become more and more important. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C38/38C22C38/50C22C38/58B23K35/22C22C33/04B21B37/00C21D8/00
Inventor 范植金李书瑞黄静陈颜堂汪福成卜勇
Owner 武钢集团有限公司
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