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Method for preparing composite pipe by expanding secondary pouring dual-metal pipe billets

A technology of bimetallic composite pipe and bimetallic pipe, which is applied in the direction of metal rolling, metal processing equipment, manufacturing tools, etc., to achieve the effects of smooth transition of connection components, simple production process, and reduced production cost

Inactive Publication Date: 2015-05-06
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Metallurgical composite pipe profiles produced by traditional methods, the interface has not achieved complete metallurgical bonding, and there are still some gaps, these gaps are often the starting point of crack propagation and corrosion cracking

Method used

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  • Method for preparing composite pipe by expanding secondary pouring dual-metal pipe billets
  • Method for preparing composite pipe by expanding secondary pouring dual-metal pipe billets
  • Method for preparing composite pipe by expanding secondary pouring dual-metal pipe billets

Examples

Experimental program
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Effect test

Embodiment 1

[0024] See attached figure 1 And attached figure 2 , (1) Select EPS beads with a diameter of 0.5mm, and use an intermittent steam pre-generator to prepare a thin-walled model with a density of 0.02-0.025g / cm3 at 150°C. The model size is Φ170×5mm, and the water-based paint is repeatedly coated After drying, silica sand is selected as the raw material to vibrate in the sand box 4, and high-frequency induction furnace is used to smelt high-alloy steel 12Cr. 1600°C, pouring under a negative pressure of 0.05MPa, the pouring speed is controlled at about 6kg / s, at the beginning of slow pouring, after the sprue 3 passes through, a large amount of fast pouring is performed immediately, and then slow down when the cavity 7 is about to be filled Pouring speed, after sand cleaning, a thin-walled high-alloy 12Cr tube blank is obtained, the tube blank diameter is 170mm, and the wall thickness is 5mm;

[0025] (2) Take the thin-walled high-alloy 12Cr tube billet as the core 8, adopt the m...

Embodiment 2

[0028] See attached figure 1 And attached figure 2 , (1) Select EPS beads with a diameter of 0.5mm, and use a batch steam pre-generator to prepare a thin-walled model with a density of 0.02-0.025g / cm3 at 150°C. The model size is Φ154×9mm, and the water-based paint is repeatedly coated After drying, silica sand is used as raw material to vibrate in sand, 4, and high-frequency induction furnace is used to smelt high-alloy steel 12Cr. The billet lost foam casting adopts a one-cast-one-shot pouring system, and the pouring temperature is 1600°C, pouring under a negative pressure of 0.05MPa, the pouring speed is controlled at about 6kg / s, at the beginning of slow pouring, after the sprue 3 passes through, a large amount of fast pouring is performed immediately, and then slow down when the cavity 7 is about to be filled Pouring speed, after sand cleaning, a thin-walled high-alloy 12Cr tube blank is obtained, the tube blank diameter is 154mm, and the wall thickness is 9mm;

[0029]...

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Abstract

The invention discloses a method for preparing a composite pipe by expanding a secondary pouring dual-metal pipe billet. The secondary pouring dual-metal pipe billet is manufactured by the following steps: by adopting an evaporative pattern casting process, pouring to obtain an inner-layer thin-walled high-alloy corrosion-resistant pipe billet, and by adopting a sand casting method, pouring to obtain an outer-layer carbon steel pipe billet, thereby obtaining the dual-metal pipe billet. The expanding process is characterized by comprising the following steps: by adopting the dual-metal pipe billet prepared by secondary pouring, performing three-roller hot-rolling expanding deformation, thereby obtaining the dual-metal composite pipe. According to fusion of the inner and outer layers of metals in the casting process and plastic deformation in the hot-rolling expanding process, the dual-metal composite pipe with good metallurgical bonding property can be obtained. According to the dual-metal composite pipe disclosed by the invention, the high-precision inner-layer metal surface is obtained by virtue of the evaporative pattern casting process, and the inner-layer metal thickness is controllable; and moreover, due to the three-roller hot-rolling expanding process, high-strength metallurgical bonding among the inner and outer layers of metals is realized, the inner-layer surface precision is high, the ellipticity is high, and the wall thickness precision is high.

Description

technical field [0001] The invention discloses a production method for preparing a bimetallic pipe blank by secondary casting, and then expanding the diameter of a bimetallic composite pipe through three-roll hot rolling, belonging to the technical field of bimetallic composite pipe preparation. Background technique [0002] As a new type of pipe, bimetallic composite pipe has been widely used in the development of foreign offshore oil and gas fields due to its good corrosion resistance and relatively cheap price. However, it is rarely used in the development of domestic offshore oil and gas fields. Bimetallic composite pipes for oil and gas fields are made of outer carbon steel and inner corrosion-resistant alloy steel. Under the premise of ensuring the strength of the pipe, it meets the corrosion resistance requirements of the inner wall of the pipe. Metallurgical bonded interface composite pipe has become the first choice for large-scale pipes in oil and gas fields due to...

Claims

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Application Information

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IPC IPC(8): B21C37/06B22D19/16B22C9/04B21B19/08
CPCB21C37/06B21B19/08B22C9/04B22D19/16
Inventor 马叙张根成李彦默
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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