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Preparation method for bimetal metallurgy composite pipe of three-layer structure

A technology of three-layer structure and bimetallic pipe, which is applied in the field of preparation of stainless steel/carbon steel/stainless steel three-layer structure bimetallic metallurgical composite pipe, which achieves the effects of simple production process, smooth transition of connection components, and reduced production cost

Active Publication Date: 2015-11-04
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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  • Preparation method for bimetal metallurgy composite pipe of three-layer structure
  • Preparation method for bimetal metallurgy composite pipe of three-layer structure
  • Preparation method for bimetal metallurgy composite pipe of three-layer structure

Examples

Experimental program
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Effect test

Embodiment 1

[0026] See attached figure 1 And attached figure 2 , (1) Choose EPS beads with a diameter of 0.5mm, and use a batch steam pre-generating machine to prepare a density of 0.02-0.025g / cm at 150°C 3 The thin-walled model with a size of Φ169×5mm is repeatedly coated with water-based paint and then dried. Silica sand is used as raw material to vibrate in a sand box for molding. High-frequency induction furnace is used to smelt high-alloy steel 12Cr. The lost foam casting adopts one pour one For the pouring system, the pouring temperature is 1600°C, and the pouring is carried out under the negative pressure of 0.05MPa. The pouring speed is controlled at about 6kg / s. At the beginning, the pouring is slow. After the sprue passes, a large amount of it is poured quickly, and the mold is almost full. Slow down the pouring speed during the cavity, and after sand cleaning, the inner thin-walled high-alloy 12Cr tube blank is obtained. The diameter of the inner tube blank is 169mm and the w...

Embodiment 2

[0031] See attached figure 1 And attached figure 2 , (1) Choose EPS beads with a diameter of 0.5mm, and use a batch steam pre-generating machine to prepare a density of 0.02-0.025g / cm at 150°C 3 The thin-walled model with a size of Φ154×9mm is repeatedly coated with water-based paint and then dried. Silica sand is used as raw material to vibrate in a sand box for molding. High-frequency induction furnace is used to smelt high-alloy steel 12Cr. The lost foam casting adopts one pour one For the pouring system, the pouring temperature is 1600°C, and the pouring is carried out under the negative pressure of 0.05MPa. The pouring speed is controlled at about 6kg / s. At the beginning, the pouring is slow. After the sprue passes, a large amount of it is poured quickly, and the mold is almost full. Slow down the pouring speed during the cavity, and after sand cleaning, the inner thin-walled high-alloy 12Cr tube blank is obtained. The diameter of the inner tube blank is 154mm and the w...

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Abstract

The invention discloses a preparation method for a bimetal metallurgy composite pipe of a three-layer structure. The method includes the steps that firstly, a thin-walled high alloy anti-corrosion pipe blank on the inner layer and a thin-walled high alloy anti-corrosion pipe blank on the outer layer are prepared through pouring according to a lost foam casting method; then, an interlayer carbon steel pipe blank is prepared through pouring and EPS modeling with the high alloy pipe blanks on the inner layer and the outer layer as mold cores, and a stainless steel / carbon steel / stainless steel bimetal composite pipe blank of a three-layer structure is obtained; and the bimetal composite pipe of the three-layer structure is manufactured by conducting three-roller hot rolling expanding deformation on the obtained bimetal pipe blank of the three-layer structure. The high-accuracy metal surfaces on the inner layer and the outer layer are obtained according to the lost foam casting method, and the metal thickness of the inner layer and the outer layer can be controlled. The resistance to three-roller hot rolling expanding deformation is small. The three layers of metal are combined through high-strength metallurgy. The surfaces on the inner layer and the outer layer are high in accuracy, good in ovality and high in wall thickness accuracy.

Description

technical field [0001] The invention belongs to the technical field of bimetallic composite pipe preparation, and discloses a method for preparing a stainless steel / carbon steel / stainless steel three-layer structure bimetallic metallurgical composite pipe. 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. Stainless steel / carbon steel / stainless steel three-layer structure bimetallic metallurgical composite pipe is made of carbon steel material in the middle layer and corrosion-resistant alloy steel material in the inner and outer layers. Under the premise of ensuring the strength of the pipe, it meets the corrosion resistance of the inner and outer walls of the pipe. Require. Metallurgical bonded interface composite pip...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 马叙张根成王悦阳丁燕红
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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