The manufacturing process of stainless steel composite pipe lined with stainless steel

High compressive and tensile strength: the inner layer is 304 stainless steel, and the outer layer is galvanized steel pipe or carbon steel pipe. After spiral extrusion and composite, the bonding, compressive and tensile strength is much higher than the national standard The inner pipe is made of stainless steel 304 material, which has anti-rust and oxidation resistance, acid and alkali resistance and other chemical properties, and the outer pipe is made of galvanizing, epoxy coal asphalt, epoxy resin, three oil and two cloth and other anti-corrosion treatments Heat and cold resistance The cold and cold cold box of hot and cold liquid nitrogen is made of stainless steel, so the stainless steel composite pipe lined with superior heat and cold resistance, and regardless of cold water pipe, one pipe is used for two purposes, both hot and cold. Easy to install, simple connection, lined stainless steel composite pipe, the installation is the same as ordinary galvanized steel pipe, welded, flange connection, groove connection or threaded connection, large diameter, small resistance, lined stainless steel composite pipe, the inner layer of stainless steel composite pipe is very thin, so the actual diameter is the same as...

In the production of stainless steel clad pipes, it is necessary for the clad steel pipe manufacturer to select different corrosion-resistant alloy layers as lining pipes according to the requirements of the process flow of salt chemical enterprises. In terms of the current domestic technology level, most of the corrosion-resistant alloys (such as pure titanium, nickel-based alloys, and ordinary stainless steel) can be used as inner liners. But for duplex stainless steels (e.g

LC2242), the composite difficulty ratio is very large. The reason is that the yield strength of duplex steel is relatively large, the elongation at break is small, if the process control is not accurate enough, it is very easy to crack in the composite process, it is understood that there are few manufacturers in the world can produce composite steel pipes lined with duplex stainless steel. Due to the existence of austenite and ferrite two metallographic structures in duplex stainless steel, its performance in resisting chloride ion corrosion and stress corrosion cracking is much higher than that of 316L, and ** is comparable to 316L.

In salt production or salt chemical enterprises, the use of duplex stainless steel composite steel pipes has great performance advantages.

In recent years, steel composite steel pipe has received more and more recognition from users, and the application range is becoming more and more extensive, but there are still many people who contact this pipe for the first time, and have doubts about the reliability and safety of its connection.

First of all, the first connection method of lining stainless steel composite steel pipe is threaded connection.

Hungry with galvanized pipes.

The connection method of the material is the same, and this method is generally used for those below DN80 caliber.

The second is a trench connection.

It is also the same as galvanized pipes, and generally DN80 caliber upwards are connected in this way.

The third is welding, which is generally in the medium and high pressure pipelines or buried pipelines, or other places with high technical and technical requirements, which is also the safest and most reliable connection method at present. However, this method is more expensive than the first two.

Customers who use stainless steel clad steel pipes lined with stainless steel must choose the connection method suitable for their working conditions, so as to meet the use conditions and not increase unnecessary costs.

Stainless steel, originated during the First World War, British scientist Brearley invented an alloy steel that is not easy to be worn out. Since then, he has also been known as the father of stainless steel. This stainless steel is not afraid of acid, alkali and salt corrosion.

Then as a stainless steel composite pipe made of stainless steel and carbon structural steel, the weight is relatively light, and compared with stainless steel, the bending and torsional strength are the same. So what is the use of stainless steel clad pipe, today Xiaotu has collected relevant information about the use of stainless steel clad pipe, I hope to help you.

Stainless steel composite pipe is a new material composed of stainless steel and carbon structural steel using non-destructive pressure synchronous compounding, which has both corrosion resistance and wear resistance of stainless steel and excellent and beautiful appearance, as well as good bending strength and impact resistance of carbon steel. In line with the national principle of energy conservation and popularization. Stainless steel composite pipe in 2002 national standard GB T18704-2002 officially promulgated, from the material quality selection, inspection and other aspects have a set of strict and standardized management, due to the appearance of beautiful, low cost and other advantages, has been widely used in bridge guardrails, decoration, vehicle accessories, conveyor rollers, textile machinery accessories and other fields.

The difference between stainless steel pipe and stainless steel composite pipe

Stainless steel composite pipe: the material is iron pipe, wrapped with a stainless steel layer outside, which is relatively strong, and the anti-rust period can be guaranteed to be no different from that of pure stainless steel under the condition that the nozzle is well closed.

Stainless steel pipe: the whole pipe is lighter than stainless steel, the load-bearing capacity is not as good as the composite pipe, but it is not easy to rust, and the stainless steel material is divided into several kinds of 200, 201, 300, 301, 304, etc., the market is generally 301 material, 304 has the best effect, followed by 301.

PPR standard implementation date of stainless steel clad pipe: 2002-10-1

Promulgating Departments:General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China.

Brief introduction: This standard stipulates the classification, code, size, shape, quality and allowable deviation of stainless steel composite pipes.

Poor, technical requirements, test methods, inspection rules, signs, labels, packaging and storage. This standard applies to the city.

Government facilities, vehicle and ship manufacturing, road and bridge guardrails, architectural decoration, steel structure grid, medical equipment, furniture, general machines.

Stainless steel composite pipes such as mechanical structural parts.

In this era of advanced science and technology, the production of stainless steel clad pipe surpasses that of stainless steel pipe, because its cost performance is higher than that of stainless steel pipe, so stainless steel clad pipe has become a widely used material in modern times. It also has a wider range of uses than stainless steel pipes. I hope that when you read this material, you can accurately separate stainless steel pipes and stainless steel composite pipes, and choose materials suitable for the current situation.

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Answer: One Advantages:

The stainless steel composite pipe lined with thin-walled stainless steel pipe is a composite thin-walled stainless steel pipe on the inner wall of the steel pipe, which overcomes the defects of easy corrosion of galvanized steel pipe and easy water leakage and aging of plastic pipe connected by hot melt, and is an ideal product for the upgrading of steel pipe for gas transmission, water transmission and oil transportation.

No scaling, no nodulation, corrosion resistance: a very thin chromium oxide film is formed on the inner wall of the pipeline during use, which prevents the metal from continuing to oxidize, so stainless steel has strong corrosion resistance, which can not only withstand the corrosion of water and air, but also the corrosion of weak acid and alkali.

It is resistant to high temperatures, and can convey hot water, boiling water, and steam.

The inner wall is smooth and the fluid flow resistance is small: the lined stainless steel pipe in the lined stainless steel composite steel pipe is welded by cold-rolled stainless steel strip, and the surface of the cold-rolled stainless steel strip is smooth and smooth, so the inner wall of the stainless steel pipe is smooth, the fluid resistance in the pipe is small, there is no scaling, and the fluid is pollution-free.

Can be welded: between the lined stainless steel composite steel pipe can be welded, before welding should use mechanical methods and organic solvents to remove the weld surface and welding groove on both sides of at least 20mm range of oil, rust, metal shavings, oxide film and other dirt.

Can be threaded: the pipe threaded connection surface is a thread with a tooth cross, the tolerance generated during machining will disappear during the thread tightening process, and the huge tightening force ensures that there is no leakage after tightening between the pipe body and the pipe fittings.

The contact surface of the pipe threaded connection is a contact between steel and stainless steel, and the expansion coefficient is very close during thermal expansion and cold contraction.

Good hygienic performance: Because the stainless steel pipe is not corroded by the fluid during use, and the stainless steel pipe body has no impurities into the fluid, the stainless steel composite steel pipe lined with stainless steel can replace the pure stainless steel pipe to transport drinking water.

**Low,

Answer: Lined with stainless steel clad steel pipe before composite:

What are the basic requirements for stainless steel pipes, the basic state of metallurgy, and the surface treatment status?

Lined with stainless steel composite steel pipe composite:

What are the basic metallurgical changes and surface changes of stainless steel pipes?

Lined with stainless steel clad steel pipe after composite.

How to deal with stainless steel pipes from the perspective of basic theory of metallurgy and heat treatment technology?

1. Main control parameters: The main control parameters of the stainless steel composite steel pipe lined with stainless steel are nominal diameter, flattening performance, strength performance, health performance, etc.

2. Definition: Carbon steel pipe is used as the base pipe, and the stainless steel liner pipe is compounded with the base pipe by the diameter reduction method, cold expansion method, deflagration method or brazing composite process.

3. Classification: The connection methods of pipelines are divided into: welded connection, threaded connection, flange connection, and groove connection.

4. Key points of selection: 1) The pipe can be applied to water supply systems such as cold water, hot water and fire water supply. 2) Select the connection mode according to the project situation.

There are welded, flanged, threaded and grooved connections. 3) You can refer to the design points of carbon steel pipe and thin-walled stainless steel pipe.

5. Key points of construction and installation (omitted).

6. Executive standards: 1) Product standard "Code for Design of Building Water Supply and Drainage" GB 50015-2003 "Lined Stainless Steel Composite Steel Pipe" CJ T 192-2004 "Safety Evaluation Standard for Drinking Water Transmission and Distribution Equipment and Protective Materials" GB T Engineering Standard "Code for Construction Quality Acceptance of Building Water Supply and Drainage and Heating Engineering" GB50242-2002.

Jiangsu Jianghe Machinery's bimetallic composite wear-resistant pipe.

First of all, the same thing is that both are "bimetallic" composites, which are in principle the composite of the outer base pipe and the inner lining pipe, which retains the inherent advantages of the two different materials and complements each other. To meet the requirements of different parts of the same casting with very different properties, as well as the use of bimetallic composite in order to save precious alloys and reduce costs.

Schematic diagram of the structure of stainless steel bimetallic composite pipe.

The above picture is a schematic diagram of the structure of stainless steel bimetallic composite pipe, the outer layer is the base pipe, the inner layer is the stainless steel liner, the outer layer is pressurized, and the inner layer is anti-corrosion. The process mainly includes mechanical rolling method, ** composite method, drawing composite method, and hydraulic composite method, and the principle is tight fitting through compression elastic contraction. It is mainly used in water affairs, water supply pipes, oil and gas transmission pipelines, power desalination water, desulfurization pipelines, etc.

The finished semi-finished product, the inner lining, is made of high-chromium alloy.

The high-chromium bimetallic composite pipe has an outer layer of Q235 steel pipe and an inner lining layer of high-chromium alloy. The main processes include centrifugal molding process method and lost foam casting method. The principle is to cast or inlay two metals with different compositions and properties together, and the middle layer is metallurgically combined.

It is mainly used in thermal power plants, coal washing plants, mine transmission pipelines, etc.

The working principle of high-chromium alloy bimetallic composite pipe: the outer base pipe is responsible for the role of pressure bearing and rigid support of the pipe, and the inner pipe is responsible for heat resistance and wear resistance. There is another reason for the use of the outer base pipe, due to the high chromium content of the inner lining, the wear resistance will be high and it will have hard brittleness, lose toughness and weldability, and the outer base pipe is generally made of steel pipe made of Q235 to meet the toughness and weldability.

Different working condition systems, suitable for different bimetallic composite pipes, Jiangsu Jianghe Machinery Manufacturing Co., Ltd. produces bimetallic lining is a high-chromium alloy, mainly used in the transmission pipeline of power mines, and the wear resistance is more than 5 times that of stainless steel.

As a veteran enterprise for 40 years, Jiangsu Jianghe Machinery Manufacturing Co., Ltd., as always, adheres to high-quality products and services to provide perfect ash conveying and powder delivery systems for power plants, coal mines, steel mills and other fields.