CN2777320Y

CN2777320Y - Bimetallic composite tube

Info

Publication number: CN2777320Y
Application number: CN 03206410
Authority: CN
Inventors: 凌星中; 徐见平
Original assignee: Zhejiang Jiaxing Zhongda Group Co Ltd; Beijing Institute of Petrochemical Technology
Current assignee: Zhejiang Jiaxing Zhongda Group Co Ltd; Beijing Institute of Petrochemical Technology
Priority date: 2003-07-25
Filing date: 2003-07-25
Publication date: 2006-05-03
Anticipated expiration: 2013-07-25

Abstract

The utility model relates to a bimetallic composite tube which belongs to the technical field of tubes and particularly relates to industrial and civil metal tubes. The composite tube comprises a basal tube and an inner coating tube, wherein the basal tube is a carbon steel tube; the inner coating tube is a thin wall stainless steel welded tube; copper base or nickel base brazing filler metal is arranged between the basal tube and the inner coating tube; the brazing filler metal can make the basal tube and the inner coating tube form firm metallurgical bonding. The bimetallic composite tube of the utility model can be used for replacing a simple stainless steel tube to reduce material cost; the utility model can be widely used for fluid transferring engineering of petroleum, chemical industry, electric power, food, water supply, etc.

Description

Composite bimetal pipe

Technical field

The utility model relates to industry and civilian metal tube.Relate in carbon steel tube, be covered with the stainless composite bimetal pipe of one deck specifically.

Background technique

Composite bimetal pipe, especially covering one deck stainless steel in carbon steel tube is that industry and civilian various pipes prevent dielectric corrosion or the contaminated product that presses for of medium, can be used for replacing the carbon steel tube of anti-corrosion precious metal pipe such as stainless steel and seriously corroded, can reduce engineering cost greatly and increase substantially pipeline life.

Existing two types composite bimetal pipe, a kind of is the composite bimetal pipe of mechanical bond, pipe and outer tube only are the drive fits of machinery promptly, it is to be inserted in the carbon steel tube by giving the Stainless Steel Tube that makes, form through cold-drawn or cold spinning manufacturing, subject matter during this pipe uses is the difference of inner and outer pipes expansion coefficient, and the hot unstability of interior pipe that caused of the gap gas that can't thoroughly eliminate; Do not heat-treat after compound because of cold, thereby reduced stainless anti-corrosion capability.Another kind is the composite bimetal pipe of metallurgy combination, and usability is good.This pipe has two kinds of manufacture methodes at present, and a kind of is to form with compound coil weld, another kind be by with the inner and outer pipes suit after great-deformation hot-rolled forming.But the former is difficult to make the medium-small diameter pipe, the complicated cost height of latter process.

Summary of the invention

For corrosion resisting property and adhesive strength between inner and outer pipe and the reduction cost of material that improves composite bimetal pipe, the utility model provides a kind of composite bimetal pipe, comprise basal body pipe, the internal coated layer pipe, basal body pipe is a carbon steel tube, the internal coated layer pipe is the thin-wall stainless steel welded tube, and is provided with layer of copper base or nickel-based brazing layer between basal body pipe and internal coated layer pipe.

Advantage of the present utility model is: do coating with the welded tube that Stainless Steel Band is made, material is easy to get, cost is low and adapt to the variation of the specification and the kind of pipe easily; Stainless steel welded pipe thickness can be very thin, thereby increase base, the coating ratio of composite pipe, reduces the stainless steel consumption, further reduces cost; Also finished the stainless heat treatment of coating in the time of induction brazing, this has just recovered the ability of stainless steel anti intercrystalline corrosion and stress corrosion; Soldering links adhesive strength height, safe in utilization between base, coating.

Description of drawings

Fig. 1 is the viewgraph of cross-section of the utility model composite bimetal pipe.

Embodiment

Referring now to Fig. 1 and in conjunction with the composite bimetal pipe of making φ 108 * (4+0.8) mm specifications the utility model is elaborated, the composite bimetal pipe among Fig. 1 comprises basic unit's carbon steel tube 1, brazing layer 2, the longitudinal seam 4 of stainless steel welded pipe 3 and stainless steel welded pipe.The manufacturing technology steps of the utility model composite bimetal pipe is as follows:

1, selecting thickness for use is the Stainless Steel Band of 0.8mm, after the roller shear blanking, makes the stainless steel welded pipe 3 of φ 97mm on continuous tubing machine, adopts from molten tungsten electrode argon arc welding welding, obtains not have to thicken high weld seam 4;

2, stainless steel welded pipe outer wall and carbon steel tube 1 inwall clean with chemical method or mechanical means;

3, be spirally wound on the stainless steel welded pipe outer surface with copper base or nickel-based solder paper tinsel band 2, and it is inserted in the carbon steel tube, form compound base pipe;

4, on the tube pulling machine, pipe in the stainless steel in the compound base pipe is carried out bulging and handle, make the gap that keeps an about 0.2mm between inner and outer pipe;

5, bulging is good composite pipe blank is by a stepless change conveyer, send into heating soldering in the intermediate frequency furnace continuously, measure temperature with infrared radiation thermometer, control brazing temperature by regulating medium-frequency power power or steel pipe feed rate, brazing temperature is higher 30～60 ℃ than solder melting point, and soldering is to carry out under protection gas;

6, cool off the pipeline section of after the heating in medium frequency soldering, sending intermediate frequency furnace fast;

7, align, be up to the standards, promptly obtain composite bimetal pipe described in the utility model.

Claims

1. composite bimetal pipe, it comprises basal body pipe (1), and internal coated layer pipe (3) is characterized in that: basal body pipe is a carbon steel tube, internal coated layer is a 0.8mm thin-wall stainless steel welded tube, and is provided with layer of copper base or nickel-based brazing layer (2) between basal body pipe (1) and internal coated layer pipe (3).