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A spiral formed x80 steel grade riser main pipe and its manufacturing method

A spiral forming and manufacturing method technology, applied in the direction of manufacturing tools, welding equipment, arc welding equipment, etc., to achieve the effect of improving low temperature toughness and weld strength, good corrosion resistance and weldability, and reducing low temperature embrittlement transition temperature

Active Publication Date: 2019-01-04
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, although my country has done some work in the research of offshore drilling riser management theory and accumulated some experience in riser maintenance, it has not yet entered the stage of substantive product formation and achieved domestic engineering application.

Method used

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  • A spiral formed x80 steel grade riser main pipe and its manufacturing method
  • A spiral formed x80 steel grade riser main pipe and its manufacturing method
  • A spiral formed x80 steel grade riser main pipe and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment

[0026] Example: A manufacturing method for the main pipe of an X80 steel grade Ф533×25.4 mm spirally formed marine riser.

[0027] 1) Raw materials: X80 steel grade 1140×25.4mm steel coils are used, and the chemical composition analysis of the coils is as follows:

[0028] Table 1 Analysis of chemical composition of main pipe of X80 Ф533×25.4mm spiral-formed marine riser (wt%)

[0029]

[0030] Table 2 Chemical composition analysis of high Ni welding wire for marine riser (wt%)

[0031]

[0032] 2) Edge milling: After edge milling, the angle of the up-groove is 60°, the angle of the down-groove is 60°, and the height of the blunt edge is 11mm.

[0033] 3) Forming: According to the actual yield strength level of the coil, the external control forming method is adopted to precisely measure and control the position and angle of each forming roller, and adjust the angle of the turntable to 45°50', the angle of the inner roll to 45°5', and the angle of the outer roll It is 45...

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Abstract

The invention discloses a spirally-formed X80 steel grade main riser. The main riser comprises the chemical components of, by mass, 0.04-0.08% or less of C, 0.15-0.35% of Si, 1.55-1.85% of Mn, 0.012% or less of P, 0.004% or less of S, 0.15-0.30% of Ni, 0.15-0,30% of Cr, 0.10-0.30% of Cu, 0.15-0.30% of Mo, 0.03-0.06% of Nb, 0.06% or less of V, 0.06% or less of Ti, 0.04% or less of Al and the balance Fe and inevitable impurities, wherein the carbon equivalent Ceq is equal to or less than 0.45%, and CEpcm is equal to or less than 0.22%. The main riser adopts a hot rolling coiled plate as a raw material, and a composite fine-crystal structure combining a needle-shaped ferrite and a bainite is adopted as the main structure. The spirally-formed X80 steel grade main riser is high in strength and dimensional precision and has excellent comprehensive properties such as the anti-fatigue property, the anti-fracture property and the anti-corrosion property.

Description

Technical field: [0001] The invention relates to the technical field of oil pipes, in particular to a spirally formed X80 steel grade riser main pipe and a manufacturing method thereof. Background technique: [0002] With the increasing demand of human beings for energy, the ocean has become a new field of global resource development. The offshore drilling riser supervisor is an important equipment unit of the ocean drilling riser system. It is an important component connecting the subsea wellhead and the drilling ship. Technology The index requirements are relatively high, especially for the geometric dimension accuracy of the welded pipe, and the development is difficult. It is a kind of oil drilling and production equipment with high risk, high difficulty, high technology and high added value. [0003] In recent years, the marine drilling riser's ability to adapt to seawater depths has exceeded 3,000 meters. At present, only the United States, Norway, Japan, France and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C22C38/02B21C37/06B23P15/00B23K9/18B23K9/235
CPCB21C37/06B23K9/18B23K9/235B23P15/00C22C38/02C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 黄晓辉毕宗岳牛辉牛爱军刘海璋李超苑清英陈长青赵红波刘斌包志刚杨军刘刚伟田磊席敏敏
Owner BC P INC CHINA NAT PETROLEUM CORP
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