How to distinguish the quality of plastic coated steel pipes

Plastic-coated steel pipe is mainly in three aspects, one is the steel pipe, the second is the plastic layer, the third is the degree of adhesion, the steel pipe is the most important, because the steel pipe determines the pressure of the whole product; Secondly, the adhesion degree of the steel pipe and the plastic coating layer, if the adhesion degree is poor, the product may be demolded for a period of time.

Therefore, when you choose a plastic-coated steel pipe, try to choose a brand with technical strength, such as: Shanghai Fuzong.

The differences between plastic-coated steel pipes and steel-plastic pipes are as follows:

1. The concept is different.

Steel-plastic pipe generally refers to steel-plastic composite pipe, the product is based on seamless steel pipe and welded steel pipe, and the inner wall is coated with high adhesion, anti-corrosion, food-grade hygienic polyethylene powder coating or epoxy resin coating. The water-supplied galvanized and plastic-coated composite steel pipe made by pre-treatment, preheating, internal coating, leveling and post-treatment processes is an upgraded product of the traditional galvanized pipe, and the steel-plastic composite pipe is generally connected with threads.

Plastic-coated steel pipe, also known as plastic-coated pipe, steel-plastic composite pipe, and plastic-coated composite steel pipe, is a steel-plastic composite steel pipe with steel pipe as the matrix, through spraying, rolling, dipping, and suction processes on the inner surface of the steel pipe (bottom pipe) to weld a layer of plastic anti-corrosion layer or on the inner and outer surfaces of the plastic anti-corrosion layer.

2. The manufacturing process is different.

Plastic coating is made by spraying plastic on the inside of galvanized steel pipes. The thickness of the inner plastic is thinner, which is equivalent to a layer of plastic**. Steel-plastic pipes actually include plastic-coated steel pipes, but everyone on the market has equated steel-plastic pipes with lined plastic steel pipes, and the lined plastic steel pipes are made of galvanized steel pipes with plastic pipes inside, and the manufacturing process of high-pressure steam process is used to bond the two.

3. The performance is different.

The plastic-coated sensation has the advantages of high strength, easy connection, and water flow impact resistance of steel pipes. It also overcomes the shortcomings of steel pipe rainwater corrosion, pollution, fouling, low strength of plastic pipe, poor fire performance, etc., and the design life can reach 50 years. The steel-plastic composite pipe has the effect of oxygen resistance, which can be directly used in direct drinking water projects, and its inner and outer layers are made of plastic, which has very good corrosion resistance.

The plastic-coated steel pipe has the characteristics of anti-corrosion and anti-rust. The inner cavity of the epoxy resin coated anti-corrosion spiral steel pipe is very smooth and clean, and the friction is not large. Suitable for natural gas pipes or drinking water pipes.

In addition, the surface of the Yinling closed pipeline can be painted with bright wall paintings, which is also more beautiful and cracked. Compared with traditional brittle and rusty pipe fittings, the service life of plastic-coated steel pipes can reach 50 years or more, and the cost is very low. Compared with air conditioning copper pipes and galvanized steel pipes, it is more cost-effective.

So at the moment it's not just the water supply lines at home. In addition to this, it is also a municipal pipe of the city. For example, plastic-coated steel pipes, which are natural gas and oil pipelines, have the hardness of the previous seamless steel pipes, and are lighter, less resistant, and flow fast in the pipeline.

Plastic-coated steel pipe is a steel-plastic composite steel pipe.

Plastic-coated steel pipe, also known as plastic-coated pipe, steel-plastic composite pipe, and plastic-coated composite steel pipe, is a steel-plastic composite steel pipe that uses the steel pipe as the matrix and welds a layer of plastic anti-corrosion layer on the inner surface of the steel pipe or a plastic anti-corrosion layer on the inner and outer surfaces of the steel pipe through spraying, rolling, dipping, and suction processes.

Plastic-coated steel pipes have excellent corrosion resistance and relatively small frictional resistance. Epoxy resin plastic-coated steel pipe is suitable for water supply and drainage, seawater, warm water, oil, gas and other media, and PVC plastic-coated steel pipe is suitable for drainage, seawater, oil, gas and other media.

The coating itself of plastic-coated steel pipes also has good electrical insulation and does not produce electrical erosion. Low water absorption, high mechanical strength, small friction coefficient, can achieve the purpose of long-term use. It can also effectively prevent the destruction of plant roots and soil environmental stress.

Easy to connect and easy to maintain.

Detection method of plastic-coated steel pipe

1. Visual inspection.

Visually inspect the appearance quality of the coated steel pipe, and the test results should comply with the regulations.

2. Thickness measurement.

Two cross-sections of different lengths are taken from both ends of the coated steel pipe, and the coating thickness of any four points directly crossed on the circumference is measured with an electromagnetic thickness gauge in each cross-section, and the test results should conform to the provisions of the book.

3. Pinhole test.

The length of the pipe section specimen is about 1000mm, and the steel pipe coating is checked with an electric spark leak detector under the specified test voltage, the coating thickness is not greater than the rock culture, the test voltage is 1500 V, and the coating thickness is greater than the test voltage is 2000V. Check whether there is an electric spark state jujube draft, and the test results should comply with the regulations.

4. Adhesion test.

The adhesion test is carried out in accordance with CJ T 120-2008, and the test results should comply with the regulations.

5. Bending test.

DN 50 mm coated steel pipes are subjected to flexure tests. The length of the pipe section specimen is 1200 100mm. In the environment of 20 5 temperature, the radius of curvature is 8 times the nominal diameter of the steel pipe, and the bending angle is 30°, and the bending is carried out on the pipe bender or die.

In the flexure test, there is no filler in the tube, and the weld is located on the side of the main curved surface. After the test, the specimen is dissected from the middle of the curved arc, the inner coating is checked, and the test results should comply with the regulations.

The above content refers to Encyclopedia - plastic-coated steel pipe.

Plastic-coated steel pipe is a kind of steel pipe processed by special technology, which has the characteristics of strong corrosion resistance, wear resistance, high temperature resistance, and not easy aging. It is widely used in pipeline systems for transporting gas, water, oil, natural gas, chemicals and other media, especially in marine environment, chemical, pharmaceutical, food and other industries.

The manufacturing process of plastic-coated steel pipe is to spray a layer of epoxy resin powder first, and then bake it at high temperature to solidify it to form a hard anti-corrosion layer. It is then sprayed with a layer of polyethylene powder to form an anti-aging, abrasion-resistant outer layer. Such double-layer plastic-coated steel pipes not only have good anti-corrosion performance, but also have good wear resistance and high temperature resistance, which can meet the requirements of various working conditions.

The service life of plastic-coated steel pipes can generally reach more than 30 years of cluster chains, which is much higher than the service life of other pipeline materials. At the same time, the installation and maintenance of plastic-coated steel pipes are also very convenient, and there is no need for anti-corrosion treatment and anti-corrosion maintenance, which reduces the difficulty of work and the investment of manpower and material resources.

In short, plastic-coated steel pipe is a pipe material with excellent performance and wide application, which has the characteristics of strong corrosion resistance, wear resistance, high temperature resistance, and not easy aging, and is widely used in pipeline systems in various fields.

Plastic-coated steel pipes are steel-plastic composite pipes.

Plastic-coated steel pipe is a steel-plastic composite steel pipe that uses the steel pipe as the matrix and welds a layer of plastic anti-corrosion layer on the inner surface of the steel pipe (bottom pipe) or a plastic anti-corrosion layer on the inner and outer surfaces through the process of spraying deficit difference, rolling, dipping and suction. Plastic-coated steel pipe has good corrosion resistance and relatively small friction resistance, and it is mainly used for drainage, exhaust, oil or warm water.

The density of plastic-coated steel pipes is high, so the service life is relatively long, and it is not easy to deform no matter what season it is used. Moreover, the plastic-coated steel pipe can adapt to various environments, such as the humid environment of the pin, the high temperature environment, and the polar temperature environment, and the plastic-coated steel pipe can be used normally.

Detection method of plastic-coated steel pipe

1. Visual inspection is to check the appearance quality of the coated steel pipe with the naked eye.

2. The thickness of the ruler is to measure the coating thickness at any four points at right angles on the circumference on any two cross sections.

3. Pinhole test refers to the use of spark detector to check the steel pipe coating at the specified test voltage, and also to check whether there is an electric spark.

4. The bending test is generally carried out on the bending machine or mold, it is worth noting that there is no filler in the tube during the bending test, and the weld is located on the side of the main surface of the bending.

5. The flattening test is to place the specimen between the two plates, and gradually compress it on the pressure testing machine until the distance between the two plates is four-fifths of the outer diameter of the specimen, and the flattening is that the weld of the coated steel pipe is perpendicular to the direction of load application.

The above content refers to Encyclopedia - plastic-coated steel pipe.

Hello, I am inquiring for you here, please wait a while, I will reply to you immediately Dear, hello, I am happy to answer for you. Plastic-coated steel pipes inside and outside, plastic-coated steel pipes inside and outside are steel-plastic composite pipes composed of polyethylene (PE) resin, ethylene acrylic acid copolymer (EAA), epoxy (EP) powder, non-toxic polypropylene (PP) or non-toxic polyvinyl chloride (PVC) and other organic substances on the inner wall of the steel pipe, which not only has the advantages of high strength, easy connection and water impact resistance of the steel pipe, but also overcomes the shortcomings of the steel pipe that is easy to corrode, pollution, scaling and the strength of the plastic pipe is not high, and the fire performance is poor. Design life up to 50 years. The main disadvantage is that the installation shall not be bent, and the cutting surface shall be brushed with non-toxic room temperature curing adhesive equipped with the manufacturer when hot processing and electric welding cutting, and the damaged parts shall be repaired.

There are many classifications of steel-plastic composite pipes, which can be classified according to the structure of the pipe: steel belt reinforced steel-plastic composite pipe, seamless steel pipe reinforced steel-plastic composite pipe, perforated steel strip steel-plastic composite pipe and steel wire mesh skeleton steel-plastic composite pipe. At present, the most popular on the market is the steel belt reinforced steel-plastic composite pipe, which is often called the steel-plastic composite pressure pipe, the middle layer of this pipe is a steel belt layer welded by crimping and butt welding, and the inner and outer layers are high-density polyethylene (HDPE).

The middle layer of this pipe is steel belt, so the pressure bearing performance of the pipe is very good, unlike the aluminum belt pressure is not high, the maximum diameter of the pipe can only be 63mm, and the maximum diameter of the steel-plastic pipe can be 200mm, or even larger; Because the steel belt in the middle layer of the pipe is sealed, this steel-plastic pipe has the effect of oxygen blocking at the same time, which can be directly used in direct drinking water projects, and the inner and outer layers are made of plastic, which has very good corrosion resistance. With such excellent performance, the steel-plastic composite pipe is widely used, and can be seen in various fields such as oil and natural gas transportation, industrial and mining pipes, drinking water pipes, drainage pipes, etc.

Steel-plastic pipe is a general term, which includes plastic-coated pipes and plastic-lined pipes. Plastic-coated pipes have internal and external plastic coating, external galvanized and internal plastic coating, etc., Shanghai Minlan, specializing in this aspect.

Plastic-coated pipes are divided into internal and external coating, as well as internal and external coating. (Of course, some are epoxy-coated, and some are PE).

Plastic-coated pipe is one of the types of steel-plastic pipe, and there are many types of steel-plastic pipes, including plastic-coating, plastic-lining, internal and external plastic coating, and internal and external epoxy, and they can all be steel-plastic pipes.

Plastic-coated steel pipe is heated to more than 200 degrees, and then polyethylene powder or epoxy resin powder is sprayed, melted, and leveled. Plastic-coated steel pipe is a kind of steel-plastic pipe, which is divided into plastic-lined steel pipe and plastic-coated steel pipe.

Plastic-coated steel pipes, generally internal and external plastic-coated steel pipes, using sandblasting chemical double pretreatment, preheating, internal coating, external coating, curing, post-treatment and other processes, the internal and external water-coated composite pipes are made of water-supplied internal and external plastic-coated composite pipes, which are the upgraded version of traditional steel-plastic pipes and galvanized pipes.

There are a lot of steel-plastic pipes, there are galvanized inner coating and inner lining plastic (the material is polyethylene or EP), there are coated steel pipes, outer and inner coated steel pipes, remember that there were manufacturers who bought Zhijun and Zhugang before, the quality is not bad, and you can also choose a closer manufacturer.

Hello, I've added something new to the foundation. There are about two types of plastic-coated steel pipes, he said a kind of plastic powder (PE), and a kind of medium coated with epoxy resin powder (EP) to spray the inner wall, and the thickness of the national standard of plastic coating reaches 350 microns. There are also reinforcing ones that can reach thicker.

If there are any shortcomings, please point me out.

Faint! Shanghai Minlan specializes in this area. A brand that I have never heard of, at first glance it is a layman