Bimetal metallurgical composite pipe and manufacturing method thereof

A composite pipe and bimetallic technology, which is applied in the field of bimetallic metallurgical composite pipe and its preparation, can solve the problems of bimetallic composite pipe interface strength, oil pipe end treatment, etc., and achieve the effect of compact structure, straight joint interface and uniform thickness

Active Publication Date: 2019-08-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a bimetallic metallurgical composite pipe and its preparation me

Method used

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  • Bimetal metallurgical composite pipe and manufacturing method thereof
  • Bimetal metallurgical composite pipe and manufacturing method thereof
  • Bimetal metallurgical composite pipe and manufacturing method thereof

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[0044] See figure 2 with image 3 , The method for preparing a bimetal metallurgical composite pipe of the present invention includes the following steps: according to the billet wall thickness requirements of the bimetal metallurgy composite pipe, the water-cooled metal model of the inner and outer metal pipes is processed, and the outer wall metal pipe is first cast, and the outer metal pipe After the layer tube is solidified, the inner metal tube is cast at a certain temperature. The water-cooled metal model structure of the bimetal metallurgical composite tube and the tube blank structure are shown in figure 1 , Its characteristic is that both ends of the tube blank are covered by inner metal. The solidified bimetal metallurgical composite tube blank is hot-rolled and formed, the tube blank is heated again to 900℃~1200℃, two rough rolling and one finishing rolling are carried out. The rolling temperature is controlled by the heating temperature of the ring furnace. Sizing i...

Example Embodiment

[0058] Examples:

[0059] A method for preparing a Φ139.7mm×9.17mm nickel-based alloy 625 / P110 bimetallic metallurgical composite pipe according to an embodiment of the present invention, the specific steps are as follows:

[0060] S1, processing water-cooled die-casting metal model: the model includes a hollow cylindrical metal mold with an inner diameter equal to the outer diameter of the bimetal tube blank, and two metal core rods with different diameters.

[0061] S2. Smelting: According to the chemical composition requirements of P110 carbon steel and nickel-based alloy 825, the two metals are respectively smelted by electric arc furnace smelting and out-of-furnace refining.

[0062] S3, water-cooled die casting casting sequence: first put a large diameter metal core rod into a hollow cylindrical mold concentrically, and cast a certain amount of liquid nickel-based alloy 825 in a vacuum environment to ensure that the bottom end of the outer carbon steel pipe is corrosion-resistant...

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Abstract

The invention discloses a bimetal metallurgical composite pipe and a manufacturing method thereof. The manufacturing method comprises the following steps of manufacturing a pipe blank of the bimetal metallurgical composite pipe by adopting a vacuum water-cooling die casting technology, specifically inner metal and outer metal are metallurgically combined in a high-temperature diffusion mode, and the two ends of the pipe blank are covered by the inner metal; carrying out hot rolling forming on the obtained pipe blank of the bimetallic metallurgical composite pipe so as to enable the pipe diameter and the wall thickness of the bimetallic metallurgical composite pipe to meet the preset standard and make the inner metal meet the preset thickness requirement; and carrying out quenching and tempering treatment on the whole hot-rolled bimetallic metallurgical composite pipe to make the outer metal meet the preset strength requirement, and completing the manufacturing of the bimetallic metallurgical composite pipe. According to the method, the high strength of an oil pipe column is ensured, and meanwhile, the integrity of corrosion resistance of the inner wall is achieved.

Description

technical field [0001] The invention belongs to the technical field of composite oil pipes for oil and gas development, in particular to a bimetallic metallurgical composite pipe and a preparation method thereof. Background technique [0002] Due to the harsh and corrosive service environment of oil and gas fields, uniform corrosion and pitting perforation failures on the inner wall of oil pipes frequently occur, and some oil pipes even have corrosion and perforation within a few months. According to the H in the environment 2 S partial pressure, CO 2 Partial pressure, Cl - Mass concentration, temperature, pressure and liquid flow, according to the order of increasing corrosion resistance, the available corrosion-resistant alloy materials include low-carbon alloy steel, martensitic stainless steel, duplex stainless steel, iron-corrosion-resistant alloy and Corrosion-resistant alloys. For the high-temperature and high-pressure natural gas fields in Northeast Sichuan, Tari...

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Application Information

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IPC IPC(8): B23P15/00B21C37/06B22D19/16C21D9/08C21D8/10C22F1/10
CPCB23P15/00B21C37/06B22D19/16C21D9/08C21D8/10C22F1/10
Inventor 路彩虹韩礼红杨尚谕王建军冯春徐欣王航蒋龙朱丽娟
Owner BC P INC CHINA NAT PETROLEUM CORP
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