Bimetallic composite steel pipe and production method thereof

A technology of composite steel pipe and production method, which is applied in the direction of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve the problems of difficult welding of bimetal mechanical composite pipes, uneven performance of composite pipes, and low welding qualification rate, etc. To achieve the effect of bonding strength guarantee, simple manufacturing process and good quality

Inactive Publication Date: 2015-01-07
HANDAN XINXING SPECIAL TUBING CO LTD
View PDF7 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention involves surfacing welding to form a corrosion-resistant alloy surfacing layer, but the technical problem it solves is that the welding of bimetallic mechanical composite pipes is difficult, the welding pass rate is low, and the speed is slow, and the two ends and the middle of the composite pipe uneven performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bimetallic composite steel pipe and production method thereof
  • Bimetallic composite steel pipe and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A bimetal composite steel pipe, the outer layer is austenitic stainless steel pipe 1, the material of austenitic stainless steel pipe 1 is 304 austenitic stainless steel; the inner layer is carbon steel pipe 3, and the material of carbon steel layer 3 is 20G Carbon steel, the outer surface of the carbon steel pipe 3 is surfacing with a nickel-based alloy bonding layer 2 for interference fit.

[0031] The production method for manufacturing the bimetal clad steel pipe comprises the following steps:

[0032] 1) Select the outer tube and inner bar: the outer tube is made of 304 austenitic stainless steel, and the inner bar is made of 20G carbon steel. Let the outer diameter of the outer tube be a and the inner diameter be b, and the outer diameter of the inner bar stock be c.

[0033] 2) Surfacing and turning nickel-based alloy layer: the outer surface of the inner bar is surfacing with a nickel-based alloy bonding layer with a thickness greater than 2mm, and turning the ...

Embodiment 2

[0039] A bimetal composite steel pipe, the outer layer is austenitic stainless steel pipe 1, the material of austenitic stainless steel pipe 1 is TP310 austenitic stainless steel; the inner layer is carbon steel pipe 3, and the material of carbon steel pipe 3 is T11 carbon The outer surface of plain steel and carbon steel pipe 3 is surfacing with a nickel-based alloy bonding layer 2 for interference fit.

[0040] The production method for manufacturing the bimetal clad steel pipe comprises the following steps:

[0041] 1) Select the outer tube and the inner tube: the material of the outer tube is TP310 austenitic stainless steel, and the material of the inner tube is T11 carbon steel.

[0042] 2) Surfacing and turning nickel-based alloy layer: Surfacing a nickel-based alloy layer with a thickness greater than 2mm on the outer surface of the inner tube, and turning the nickel-based alloy layer, the thickness of the nickel-based alloy layer after turning 1mm.

[0043]3) Interf...

Embodiment 3

[0047] A bimetal composite steel pipe, the outer layer is carbon steel pipe 3, the material of carbon steel pipe 3 is T11 carbon steel; the inner layer is austenitic stainless steel pipe 1, and the material of austenitic stainless steel pipe 1 is TP310 austenitic Body stainless steel, the inner surface of the carbon steel pipe 3 is surfacing with a nickel-based alloy bonding layer 2 for interference fit.

[0048] The production method for manufacturing the bimetal clad steel pipe comprises the following steps:

[0049] 1) Select the outer tube and inner bar: the outer tube is made of T11 carbon steel, and the inner bar is made of TP310 austenitic stainless steel.

[0050] 2) Surfacing and turning nickel-based alloy layer: Surfacing a nickel-based alloy bonding layer with a thickness greater than 3mm on the inner surface of the outer tube, and turning the nickel-based alloy bonding layer, the nickel-based alloy bonding layer after turning The thickness is 3mm.

[0051] 3) Int...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a bimetallic composite steel pipe and a production method thereof and relates to the technical field of metal rigid pipes and manufacturing methods thereof. The bimetallic composite steel pipe comprises an austenitic stainless steel pipe and a carbon steel pipe, the connection surface between the austenitic stainless steel pipe and the carbon steel pipe is provided with a nickel-based alloy joint layer formed by surfacing and turning, and interference fit is used. The production method includes the steps of selecting an outer pipe and an inner pipe or an inner bar, machining the nickel-based alloy joint layer through surfacing and turning, performing interference fit on a mechanical bushing, performing reaming and high-temperature diffusion heat treatment, and performing extrusion forming to produce the bimetallic composite steel pipe. According to the bimetallic composite steel pipe and the production method thereof, the nickel-based alloy layer is formed between the inner metal and the outer metal of the bimetallic composite steel pipe through surfacing so as to prevent carbon elements of the carbon steel from diffusing into the austenitic stainless steel to further effectively prevent the corrosion resistance of the austenitic stainless steel from being damaged, and accordingly, the joint strength is guaranteed, the pass rate is high, the compositions are stable, the quality is good, the manufacturing process is simple, and the cost of production is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of metal rigid pipe and its manufacturing method. Background technique [0002] Bimetallic boiler tubes are mainly used in lye recovery boilers. The outer layer needs to use austenitic stainless steel with better anti-corrosion performance such as 304 and Tp310, and the inner layer needs to use carbon steel with better thermal conductivity such as 20, 20G and T11; currently The production process of bimetallic boiler tubes includes: centrifugal casting bimetallic tube billet + extrusion molding, simple mechanical inserting + extrusion molding. Due to the large difference in the melting point of the inner and outer metals in the centrifugal casting bimetallic tube blank, the composition is difficult to control, and the qualified rate of the tube blank is low. However, the bare tube extruded by simple mechanical inserting bimetallic tube blank has insufficient bonding strength and low yield. Therefore, the s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/02B21C37/06
CPCB21C37/06F16L9/02
Inventor 王磊孙建伟武贤叶丙义李中华
Owner HANDAN XINXING SPECIAL TUBING CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap