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A kind of preparation method of bimetallic composite finned tube

A finned tube and bimetallic technology, which is applied in the field of composite pipe preparation, can solve the problems of adverse plasticity of bimetallic composite pipes, easy formation of brittle intermetallic compounds, and long bimetallic retention time, achieving large reduction and low cost Low, the effect of improving tissue density

Inactive Publication Date: 2016-08-17
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The cold working method is characterized by a simple process, but the existing problems are: the amount of deformation in a single pass is small, the interface of the composite pipe is basically mechanically bonded, there is no diffusion of atoms between the two metals, and the bonding strength is low
The characteristic of the thermal processing method is that the general bimetallic pipe is compounded at a higher temperature, and the two metals produce atomic diffusion on the interface, so the bonding strength is very high, but the disadvantage of the thermal processing composite method is that the process is too complicated and the investment in equipment is large. , high energy consumption, the most important thing is that the bimetal keeps for a long time at high temperature, and brittle intermetallic compounds are easily formed at the interface, which has an adverse effect on the plasticity of the bimetal composite pipe

Method used

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  • A kind of preparation method of bimetallic composite finned tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of pure titanium-clad red copper bimetallic composite finned tubes.

[0025] (1) Pretreatment: The specification of pure titanium tube is 70mm in diameter and 5mm in wall thickness; Die steel); use 4% NaOH solution to degrease pure titanium tubes and copper tubes, and use 20% HNO for pure titanium tubes 3 Pickling with +7% HF solution, and pickling the copper tube with 12% HCl solution; then use a wire brush to polish the inner surface of the pure titanium tube and the outer surface of the copper tube to form a fresh metal matrix.

[0026] (2) Sleeve assembly: put the polished copper tube into the pure titanium tube, and insert the mandrel of the planetary rolling mill into the copper tube.

[0027] (3) Rolling composite: use a three-roll planetary rolling mill to roll the inner and outer tubes into a composite smooth tube. During rolling, the pure titanium-clad copper bimetal composite tube is heated by online induction. The heating temperature is 400-450 ...

Embodiment 2

[0031] Preparation of pure titanium clad 20 steel bimetallic composite finned tube.

[0032] (1) Pre-treatment: pure titanium tube is 60mm in diameter, 5mm in wall thickness, 49.5mm in diameter, 5mm in wall thickness in No. 20 steel pipe, 0.5mm in casing gap, 3m in length, and Φ39mm in diameter For die steel), use 4% NaOH solution to degrease pure titanium pipe and No. 20 steel pipe, and use 20% HNO for pure titanium pipe 3 +7% HF solution for pickling, 20 steel pipes with 10% H 2 SO 4 The solution is pickled, and then the inner surface of the pure titanium tube and the outer surface of the 20-gauge steel pipe are ground to a fresh metal matrix with a wire brush.

[0033] (2) Casing assembly: put the polished No. 20 steel pipe into the pure titanium pipe, and insert the mandrel of the planetary rolling mill into the No. 20 steel pipe.

[0034] (3) Rolling composite: use a three-roll planetary rolling mill to roll the inner and outer tubes into a composite smooth tube, and c...

Embodiment 3

[0037] Preparation of pure titanium clad pure aluminum bimetallic composite finned tubes.

[0038] (1) Pre-treatment: The specification of pure titanium tube is 65mm in diameter, 6mm in wall thickness, the specification of pure aluminum tube is 52.5mm in diameter, 6mm in diameter, the casing gap is 0.5mm, the length is 5m, and the mandrel diameter is Φ40mm (the material is mold Steel), use 4% NaOH solution to degrease pure titanium tubes and pure aluminum tubes, use 20% HNO for pure titanium tubes 3 +7% HF solution for pickling, pure aluminum tube for pickling with 5% HCl solution, and then use a wire brush to polish the inner surface of the pure titanium tube and the outer surface of the pure aluminum tube to form a fresh metal matrix.

[0039] (2) Sleeve assembly: put the polished pure aluminum tube into the pure titanium tube, and insert the mandrel of the planetary rolling mill into the pure aluminum tube.

[0040] (3) Rolling composite: use a three-roll planetary rolling...

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Abstract

The invention discloses a manufacturing method of a bi-metal composite finned tube, and belongs to the technical field of composite tube manufacturing. The manufacturing method of the bi-metal composite finned tube comprises the steps that firstly, preprocessing is conducted on an inner tube and an outer tube to obtain a metal base body with a bright surface; secondly, the inner tube and the outer tube are combined to form sleeving tubes; thirdly, one-time rolling composite forming is conducted on the inner and outer sleeving tubes through a three-roller planetary mill, and online induction heating is conducted on the sleeving tubes in the rolling process so as to obtain a bi-metal composite smooth tube; finally, fins are manufactured on the composite smooth tube through rolling or welding so as to obtain the bi-metal composite finned tube. When the manufacturing method of the bi-metal composite finned tube is utilized, the bi-metal composite finned tube with a corrosion-resistant outer layer can be manufactured, and combination strength of composite metal is high; used production equipment is simple, flexibility is high, and the cost is low; the manufacturing method can be used for manufacturing titanium cladding copper composite finned tubes, titanium cladding steel composite finned tubes and titanium cladding aluminum composite finned tubes.

Description

technical field [0001] The invention belongs to the technical field of composite pipe preparation, and in particular relates to a method for preparing bimetallic composite finned pipes that can be used for titanium-clad copper, titanium-clad steel and titanium-clad aluminum. Background technique [0002] Finned tubes are widely used in heat exchanger tubes in petroleum, chemical, electric power, refrigeration industries and other fields. Due to the complex environment, finned tubes often work under high temperature and strong corrosion conditions, so the corrosion resistance of finned tubes has become an urgent problem. The problem. Currently commonly used solutions: one is to use corrosion-resistant alloys, but the cost is higher; the other is to use non-corrosion-resistant alloys with larger wall thickness (generally greater than 5mm), but they need to be replaced in time, and still require a large follow-up cost. [0003] The inner and outer tubes of the bimetal composit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D53/06
CPCB21D53/06
Inventor 梁贺闫晓东李德富陈松杨银
Owner GRIMAT ENG INST CO LTD
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