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Method for producing metal composite seamless pipe with metallurgical binding

A metal composite pipe and metal composite technology, which is applied in the direction of metal extrusion control equipment, metal extrusion, manufacturing tools, etc., can solve the problems of high production cost, limited use environment, and rising manufacturing cost, and achieve the improvement of grain structure , reduce manufacturing costs, improve the effect of comprehensive performance

Inactive Publication Date: 2007-04-11
PANGANG GROUP SICHUAN CHANGCHENG SPECIAL STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the metal composite seamless pipes produced by the above two processes are: A. The production cost is high. Its manufacturing cost has risen sharply
Although this type of seamless steel pipe can achieve metallurgical bonding at the interface to eliminate the shortcomings of the above two processes, it is limited to use in the as-cast state because there is no subsequent thermal deformation, and its coarse as-cast structure makes the mechanical properties of each layer of metal insufficient. to play
This process is also difficult to directly produce thin-walled and small-diameter seamless pipes, and its use environment is greatly restricted

Method used

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  • Method for producing metal composite seamless pipe with metallurgical binding
  • Method for producing metal composite seamless pipe with metallurgical binding

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] 1. According to the use and specifications of the metal composite seamless pipe, the double-layer structure centrifugal casting composite pipe blank is selected. The outer layer 1 is carbon steel 20Cr, the inner layer 2 is stainless steel 304, and the thickness of the inner stainless steel is 1 / 4 of the total wall thickness;

[0024] 2. The metal composite tube blank is preheated in a ring furnace first, and then heated in an induction heating furnace; the final heating temperature is 1050°C;

[0025] 3. Send the heated composite tube billet into the extruder for hot extrusion; the total compression deformation is 70%;

[0026] 4. Send the hot-extruded metal composite tube into the annealing furnace for high-temperature diffusion annealing. The diffusion annealing temperature is 830°C, and the annealing holding time is 2 hours;

[0027] 5. Straighten the heat-treated metal composite seamless pipe, remove burrs, cut heads, and cut to length;

[0028] 6. Inspection and...

example 2

[0030] 1. According to the use and specifications of the metal composite seamless pipe, the double-layer structure centrifugal casting composite pipe blank is selected. The outer layer 1 is stainless steel 304, the inner layer 2 is stainless steel 316, and the thickness of the inner stainless steel 316 is 1 / 2 of the total wall thickness;

[0031] 2. The metal composite tube blank is preheated in a ring furnace first, and then heated in an induction heating furnace; the final heating temperature is 1150°C;

[0032] 3. Send the heated composite tube billet into the extruder for hot extrusion. The total compression deformation is 95%;

[0033] 4. Send the hot-extruded metal composite tube into the annealing furnace for high-temperature diffusion annealing; the diffusion annealing temperature is 1050°C, and the annealing holding time is 4 hours;

[0034] 5. Straighten the heat-treated metal composite seamless pipe, remove burrs, cut heads, and cut to length;

[0035] 6. Inspect...

example 3

[0037] 1. According to the use and specifications of the metal composite seamless pipe, the double-layer structure centrifugal casting composite pipe blank is selected. The outer layer 1 is low alloy steel 35CrMo, the inner layer 2 is high temperature alloy steel 0Cr13Mo, and the thickness of the inner layer high temperature alloy steel is 1 / 3 of the total wall thickness;

[0038] 2. The metal composite tube blank is preheated in the ring furnace first, and then heated in the induction heating furnace; the final heating temperature is 1250 °C;

[0039] 3. Send the heated composite tube billet into the extruder for hot extrusion; the total compression deformation is 80%;

[0040] 4. Send the hot-extruded metal composite tube into the annealing furnace for high-temperature diffusion annealing; the diffusion annealing temperature is 950°C, and the annealing holding time is 3 hours;

[0041] 5. Straighten the heat-treated metal composite seamless pipe, remove burrs, cut heads, an...

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Abstract

The present invention belongs to the field of seamless steel pipe producing technology, and is especially production process of seamless composite metal pipe with metallurgical binding. The production process includes the following steps: heating the composite pipe blank in an induction heating furnace, hot extruding the composite pipe blank in an extruder for different metal layers to deform synchronously and homogeneously and to form the metallurgical binding between the different layers, annealing in an annealing furnace, straightening, end cutting and lengthing, and packing. The seamless composite metal pipe with metallurgical binding has low production cost.

Description

technical field [0001] The invention belongs to the technical field of seamless steel pipes, in particular to a method for manufacturing metal composite seamless pipes with metallurgical bonding. Background technique [0002] The composite pipe is composed of two or more different materials, one material is inside and the other is outside; the pipe layers are tightly combined, and when the external force is applied, the pipes of two or more materials are deformed at the same time . Composite pipes made of different inner and outer materials have a wide range of uses. Composite pipes are used in places that require high temperature resistance, high pressure resistance, corrosion resistance, prevention of fracture caused by corrosion or rust prevention, aesthetics and wear resistance. In refineries and chemical industries, composite pipes can be used for crude oil transportation pipelines, heating furnace pipes, and nozzles for inspection; In object transportation, composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/04B21C29/00B21C31/00C21D11/00C21D9/08
Inventor 韩静涛苗长江范英俊刘建彬李生国王黎晖解国良鲍善勤刘明忠倪明贵陈睿张永军苏承龙杨玉学刘靖郭明海邢振国武贤
Owner PANGANG GROUP SICHUAN CHANGCHENG SPECIAL STEEL
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