Definition And Classification Of Galvanized Steel Pipe

Galvanized steel construction pipe is a welded steel pipe with a hot-dip or electro-galvanized surface. Galvanizing can increase the corrosion resistance of the steel pipe and prolong its service life.

The galvanized pipe is widely used, not only as the pipeline for water delivery, gas, oil and other general low-pressure fluid, but also as the oil well pipe and oil pipe of the petroleum industry, especially the offshore oil field, the oil heater, condensate cooler, coal distillate wash oil exchanger pipe of the chemical cooking equipment, as well as the trestle pipe pile, the support frame pipe of the mine tunnel, etc.

Classification of galvanized steel pipes:

Galvanized steel pipe is divided into cold galvanized steel pipe and hot galvanized steel pipe. Cold galvanized steel pipe has been banned, the latter is also advocated by the state can be used temporarily.Hot dip galvanized steel pipe is widely used in fire protection, electric power, and highway.

Hot-dip galvanized pipe:

Hot-dip galvanized pipe is to make molten metal react with iron matrix to produce an alloy layer, so that the matrix and coating are combined.

Hot-dip galvanizing is to pickle the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned by ammonium chloride or zinc chloride aqueous solution or the mixture of ammonium chloride and zinc chloride aqueous solution tank, and then it is sent into the hot-dip galvanizing tank.

Hot-dip galvanizing has the advantages of uniform coating, strong adhesion, and long service life. The complex physical and chemical reactions between the hot-dip galvanized steel pipe matrix and the molten bath form a zinc-iron alloy layer with a close corrosion-resistant structure. The alloy layer is integrated with a pure zinc layer and steel pipe matrix, so it has strong corrosion resistance.

Cold galvanized pipe:

The cold galvanizing pipe is galvanizing, the amount of galvanizing is very little, only 10-50g / m2, its corrosion resistance is much different from that of hot galvanizing pipe. Regular galvanized pipe manufacturers, in order to ensure the quality, most do not use galvanizing (cold plating). Only those small-scale and old equipment small enterprises use galvanizing, of course, their prices are relatively cheap.

The Ministry of construction has officially eliminated the technologically backward cold galvanized pipes, which are not allowed to be used as water and gas pipes. The galvanized layer of cold galvanized steel pipe is an electroplated layer, and the zinc layer is separated from the steel pipe substrate. The zinc layer is thin and easy to fall off. So its corrosion resistance is poor. In newly built houses, it is forbidden to use cold galvanized steel pipes as water supply pipes.

Do you know about the galvanized fire pipe?

Our company is one of the most professional galvanized steel water pipe supplier in our country. At present, the galvanized fire pipe and the galvanized steel construction pipe is our hot sale products. In our local place , these products are very popular in our customer and they add the order to our company.

Also known as galvanized fire pipes, are divided into hot galvanizing and electronic galvanizing. Hot galvanizing has a thick galvanized layer and has the advantages of uniform coating, strong adhesion and long service life. Electronic galvanizing is low in cost, the surface is not very smooth, and its corrosion resistance is much worse than that of galvanized pipes. Galvanized steel pipes are mainly classified into cold-coated pipes and hot-coated pipes. The former has been banned, while the latter has been recommended by the state for temporary use. Hot-galvanized pipes are made by reacting molten metal with an iron matrix to produce an alloy layer, thus combining the matrix and the coating. Hot galvanizing is to pickling the steel pipe first. In order to remove iron oxide on the surface of the steel pipe, after pickling, the steel pipe is washed in an aqueous solution of ammonium chloride or zinc chloride or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent into a hot dip plating tank. Hot galvanizing has the advantages of uniform coating, strong adhesion and long service life. Most of the processes in the north adopt direct coil zinc filling process with galvanized strip. Cold galvanizing of cold galvanized pipes is electronic galvanizing. The amount of galvanizing is very small, only 10-50g/m2. Its corrosion resistance differs greatly from that of hot galvanized pipes. In order to ensure the quality, most of the normal galvanized pipe manufacturers do not use electronic galvanizing (cold plating). Only those small enterprises with small scale and outdated equipment adopt electronic galvanizing, and of course their prices are relatively low. Cold galvanized pipes are not allowed to be used as water and gas pipes in the future.

Square Galvanized Steel Pipe

Most square tubes are made up of galvanized steel tubes, which are unpacked, flattened, crimped and welded to form round tubes, which are then rolled into square tubes and then cut to the required length. Generally, 50 square tubes per package are mostly of large specifications in the spot, ranging from 10*10*0.8-1.5~~500*500*10-25. The square tubes are divided into structural square tubes, decorative square tubes, building square tubes, mechanical square tubes, etc. according to their uses. Square tube is a kind of appellation for square tube, that is, steel tube with equal side and length. It is made by rolling strip steel through technological treatment.

Replacing and drawing square tubes: strip steel is usually unpacked, flattened, crimped and welded to form round tubes, which are then rolled into square tubes and then cut to the required length.

The use of carbon steel seamless pipe, do you know？

Our company is one of the most professional carbon steel seamless pipe manufacturer in our country. At present, the carbon steel seamless pipe and the API carbon steel seamless pipe is our hot sale products. In our local place , these products are very popular for customer and they add the order to our company.

API Carbon Steel Seamless Pipe can be used for steam, water, oil, gas and other pipelines with lower pressure. It can be used to make various superheated steam pipes of low and medium pressure boiler tubes, boiling water pipes and superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes for locomotive boilers, and the general service temperature is below 350 degrees. It Suitable for high pressure and above pressure water tube boiler heating surface tube. Can be used for oil and natural gas transmission pipeline. It is suitable for manufacturing class I and class II pressure-resistant piping systems for ships, low and medium pressure boiler tubes, superheater tubes and pressure-resistant tubes for ships. Can be used for manufacturing automobile half axle sleeves and drive axle housings. Which is used for manufacturing a common rolling bearing sleeve. It is used to manufacture ejector rod of pipe puller. Can be used for manufacturing various tubes for mandrels. Can be used for coal mine supports, hydraulic parts, mechanical structures, etc. It is suitable for all kinds of seawater transportation pipelines, structural parts and power station pipes.

Seamless Steel Pipe

Carbon steel seamless pipes are widely used. Seamless steel pipes for general use are rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with large output, and are mainly used as pipes or structural parts for conveying fluids. Supply is divided into three types according to different purposes: A. supply according to chemical composition and machinery performance; B. according to the mechanical performance supply; C. according to the water pressure test supply. Steel pipes supplied according to categories A and B, if used to withstand liquid pressure, shall also be subjected to hydraulic pressure test. Special purpose seamless pipes. There are many kinds of seamless pipes for boilers, chemical power, geological seamless steel pipes and petroleum seamless pipes. Seamless steel pipes have a hollow cross section and are widely used as Conduit for transporting fluids, such as pipelines for transporting oil, natural gas, Coal Gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter in weight when its bending and torsion strength is the same, and it is an economic section steel. It is widely used to manufacture Structure parts and machinery parts, such as petroleum drill pipes, auto transmission shafts (consisting of shaft pipes, telescopic sleeves and universal joints), bicycle frames and steel scaffolds used in construction. circular parts made of steel pipes can improve the availability of materials, simplify the manufacturing process, save materials and working hours. steel pipes have been widely used for manufacturing.

Where to Use Carbon Steel Seamless Pipe

Our company is one of the most professional carbon steel seamless pipe manufacturer in our country. Because our products are of good quality and excellent price, they have won unanimous praise from people inside and outside the industry. What is more, we have a lot of carbon steel seamless pipe and carbon steel seamless gas pipe for sale. 

Carbon steel seamless pipes are widely used. Seamless steel pipes for general use are rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with large output, and are mainly used as pipes or structural parts for conveying fluids. 

Supply is divided into three types according to different purposes: A supply according to chemical composition and machinery performance; B according to the mechanical performance supply; C according to the water pressure test supply. 

Steel pipes supplied according to categories A and B, if used to withstand liquid pressure, shall also be subjected to hydraulic pressure test. Special purpose seamless pipes. There are many kinds of seamless pipes for boilers, chemical power, geological seamless steel pipes and petroleum seamless pipes. Seamless steel pipes have a hollow cross section and are widely used as Conduit for transporting fluids, such as pipelines for transporting oil, natural gas, Coal Gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter in weight when its bending and torsion strength is the same, and it is an economic section steel. It is widely used to manufacture Structure parts and machinery parts, such as petroleum drill pipes, auto transmission shafts (consisting of shaft pipes, telescopic sleeves and universal joints), bicycle frames and steel scaffolds used in construction. circular parts made of steel pipes can improve the availability of materials, simplify the manufacturing process, save materials and working hours. steel pipes have been widely used for manufacturing.

In the world, carbon steel seamless gas pipes are mainly used to transport oil and gas . There are roughly three types of pipes: submerged arc welding pipes include straight submerged arc welding pipes and spiral submerged arc welding pipes. High frequency straight seam welded pipe and seamless steel pipe. The same is true in China, where LSAW, SSAW, ERW and SMLS are the main types of steel pipes. Of course, the main character of carbon steel seamless gas pipe is no welding seams and are formed by cold drawing or rolling round steel after piercing. No matter what aspect it is, it is higher than ordinary steel pipes, and seamless steel pipes will be treated seamlessly, so the ability to resist pressure will be very strong. Seamless steel pipes do not show many rust marks after being used for a period of time like common steel pipes, and seamless steel pipes do not cause various damages to human bodies when being used.