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High-strength water riser main-pipe with excellent anti-fatigue performance and manufacturing method thereof

A manufacturing method and riser technology, applied in the manufacture of tools, drill pipes, casings, etc., to achieve the effects of high toughness, good corrosion resistance, and narrow strength range

Active Publication Date: 2014-02-05
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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The domestic patent has not yet seen the manufacturing process related to the riser main pipe

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  • High-strength water riser main-pipe with excellent anti-fatigue performance and manufacturing method thereof
  • High-strength water riser main-pipe with excellent anti-fatigue performance and manufacturing method thereof
  • High-strength water riser main-pipe with excellent anti-fatigue performance and manufacturing method thereof

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Embodiment Construction

[0045] The present invention is described in further detail below in conjunction with accompanying drawing:

[0046] see figure 1 , figure 2 , image 3 and Figure 4 , the embodiment of the present invention is as follows:

[0047] 1. The controlled-rolled steel plate of TMCP X80 with a thickness of 25.4mm is adopted, and its chemical composition (mass percentage) is: C0.06%, Si0.21%, Mn1.78%, P0.012%, S0.002%, Ni0 .13%, Cr0.13%, Cu0.12%, Mo0.10%, Nb0.04%, V0.004%, Ti0.015%, Al0.03%, B0.0003%, N0.0046%, Al / N=6.52, Ni+Cu+Mo+Cr=0.48%, Nb+V+Ti=0.059%, carbon equivalent Ceq is 0.42, cold crack coefficient Pcm is 0.18.

[0048] 2. Welding arc-inducing arc plate: Weld one arc-inducing arc plate at four right angles to the rolling direction of the steel plate, and lead the end of the weld seam and the arc crater during arc ignition to the outside of the weldment during welding , to improve the magnetic field distribution at the end and reduce the degree of magnetic deflection...

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Abstract

The invention discloses a high-strength water riser main-pipe with excellent anti-fatigue performance and a manufacturing method thereof. the water riser main-pipe comprises the following chemical components: by weight, 0.04-0.08% of C, 0.15-0.35% of Si, 1.55-1.85% of Mn, P being less than or equal to 0.015%, S being less than or equal to 0.003%, Ni being less than or equal to 0.30%, Cr being less than or equal to 0.30%, Cu being less than or equal to 0.25%, Mo being less than or equal to 0.25%, 0.02-0.060% of Nb, V being less than or equal to 0.06%, 0.008-0.06% of Ti, 0.010-0.040% of Al and N being less than or equal to 0.008%, Al / N being greater than or equal to 3, Ni+Cu+Mo+Cr being less than or equal to 0.70%, and Nb+V+Ti being less than or equal to 0.12%. Carbon equivalent Ceq is less than or equal to 0.45, and cold crack coefficient Pcm is less than or equal to 0.23. A microstructure is a composite fine-grain structure of acicular ferrite+bainite. The invention provides an X80 high-strength water riser main-pipe with fatigue resistance and high dimensional accuracy. The water riser main-pipe is characterized by having excellent comprehensive performance such as plasticity, low-temperature toughness, fracture resistance, corrosion resistance and the like.

Description

Technical field: [0001] The invention belongs to the field of petroleum pipes, and relates to a high-strength riser main pipe with excellent fatigue resistance and a manufacturing method thereof, in particular to a high-strength, corrosion-resistant and high-dimensional precision marine pipe with good fatigue resistance and low-temperature toughness. X80 steel grade for drilling and exploration, pipe diameter Φ533.4mm, wall thickness 25.4mm marine riser longitudinal submerged arc welded pipe forming technology and multi-wire submerged arc welding technology. Background technique: [0002] The drilling riser system is an important equipment for drilling on the offshore drilling platform. The single offshore drilling riser is the main body of the riser system. It is a liquid delivery pipeline from the offshore drilling platform to the submarine blowout preventer device. Various control pipelines, as well as guiding drill pipes and drilling tools from the drill floor to the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58E21B17/00B23P15/00B23K9/18
Inventor 毕宗岳牛爱军牛辉张锦刚张万鹏刘海璋黄晓辉赵红波张君刘斌陈长青杨军包志刚
Owner BC P INC CHINA NAT PETROLEUM CORP
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