Galvanized strip pipe is a kind of steel pipe made from cold-rolled galvanized strip steel, which is formed by cold bending and then welded by high frequency. It is characterized by strong protective effect and strong corrosion resistance. Let's introduce the production process of galvanized steel pipe.

1. Feeding process

The first process is the feeding process, the galvanized strip is fixed on the material rack; Convenient to put the strip steel into the storage box for the unit to use, our company spent a lot of money to build MES system, above the production information, production information, warehousing information. Realize paperless office, information sinks to every process, so that employees have first-hand information in real time. Raw materials enter the storage box to ensure continuous operation of the unit.

2. The second process of forming welding zinc supplement process is forming welding zinc supplement process. The strip steel is transformed into steel pipe by forming roll. Next up is the welding and scab removal process. We adopt the more advanced ERW welding process in China, the main principle is to use the skin effect and proximity effect of high-frequency welding, so that the surface metal of the weldment to be welded can be heated quickly to achieve welding. Its advantage is that the heat affected zone of the weld is small, the heating speed is fast, and the welding speed and quality are improved. This process plays a key role in the corrosion resistance of the weld of the steel pipe. We use 2 zinc wires with a diameter of 1.5mm and a zinc content of 99.99% to replenish the weld with zinc to ensure the corrosion resistance of the weld to the maximum extent. With this process, we can ensure that the weld is completely invisible on the outside of the steel pipe, and the corrosion resistance of the weld after our treatment is completely consistent with the other parts of the steel pipe.

3. Set the straight process

The third process is the sizing and straightening process, the adjustment of the welded billet shaping roller can ensure the outer diameter accuracy of the steel pipe, or the round pipe is changed into a square tube, and the straightening roller can ensure the straightness of the steel pipe.

4. Flying saw sawing process

The fourth process is the sawing process, when the length meets the parameter requirements, the flying saw will automatically cut, we use the latest generation of high-speed flying saw, cutting speed can reach 150 meters -180 meters/minute; To ensure that the pipe end interface is more flat to the maximum extent, more convenient for later end customers to use.

5. The fifth process of weld inspection process is the weld inspection process. Our product quality control is quite strict. The staff will single out the unqualified products, and we will downgrade the unqualified products.

6. Inkjet marking process

The sixth process is the inkjet printing process, our company uses France's more advanced inkjet machine, which is characterized by clear inkjet, not easy to fade. Our product brand name, slogan and product implementation standards are printed on each steel pipe to ensure that each steel pipe can be reflected.

7. Passivation process

The seventh process is passivation process, in the passivation process we have our own invention patent - galvanized pipe passivation liquid automatic spraying system, to ensure that the passivation liquid 360° uniform adhesion, high passivation efficiency, beautiful outside. Can meet the salt spray test for at least 18 hours, no corrosion. Exclusive process, anticorrosive and durable.

8. The eighth process of automatic blanking packaging process is the automatic blanking system of steel pipe, which is the highest application of our automation and intelligent program. The robot arm is turned over to the conveyor chain, and the protected conveyor chain transmits the steel pipe to the material of the stepper machine for step loading. The automatic sensor is used to identify the position of the steel pipe, the system collects signals, controls the reciprocating transport of the steel pipe by the stepper, and aligns the steel pipe by the roller table. The automatic coding machine automatically identifies the number of steel pipes according to the input instructions, and uses the electromagnetic device to pick up, translate, place and reset the steel pipes in one go to realize the automatic place. The whole process does not require manual operation, and workers only need to monitor the system to work correctly.

9. Automatic weighing and labeling process after packaging, the steel pipe is stepped to the weighing machine by the conveyor chain, and automatically lifted and weighed, automatically labeled, automatically pasted, and automatically discharged from the warehouse in one go. Greatly reduce the labor intensity of employees, but also to ensure that the weight of each steel pipe is accurate, and each steel pipe information (product specifications, production date, raw material manufacturers, production teams, each piece of weight) are given an independent two-dimensional code, easy to trace.

Galvanized pipe (SC) is a common steel pipe material, which is treated by hot-dip galvanizing technology in the manufacturing process. So, what does galvanized pipe SC mean?

1. Basic concept of galvanized pipe

Galvanized pipe refers to the pipe immersed in molten zinc liquid, after a series of chemical reactions and physical changes, so that the surface of the pipe formed a layer of zinc-iron alloy coating of the pipe. This galvanized treatment can effectively prevent the corrosion of the surface of the steel pipe and extend the service life of the steel pipe.

2. Meaning of galvanized pipe SC

The "SC" in galvanized pipe SC stands for "Standard Class". In the production and sales process of galvanized pipes, in order to facilitate the distinction between different standards and specifications, some code names or abbreviations are often used to indicate.

3. Standard grade of galvanized pipe SC

The standard grade of galvanized pipe is differentiated according to its manufacturing process and material and other factors. Generally, galvanized pipe SC is divided into SC1, SC2 and SC3 grades, which correspond to different surface treatment quality and corrosion resistance.

SC1: The surface treatment quality is higher, the galvanized layer is thicker, and the corrosion resistance is better. Suitable for demanding engineering projects, such as chemical, oil, natural gas and other fields.

SC2: Moderate surface treatment quality, moderate galvanized layer, good corrosion resistance. Suitable for general engineering projects, such as buildings, Bridges, roads and other fields.

SC3: The surface treatment quality is low, the galvanized layer is thin, and the corrosion resistance is general. It is suitable for some projects with low requirements for galvanized layer, such as agriculture, furniture and other fields.

4. Application field of galvanized pipe SC

Galvanized pipes are widely used in various fields, including construction, industry, agriculture and so on. It has the following main features:

- Good corrosion resistance: the galvanized layer can effectively prevent the surface of the steel pipe from oxidation and corrosion, and improve the service life of the steel pipe.

- Good welding performance: the galvanized pipe can maintain good welding performance during the welding process, and it is not easy to have weld cracking and other problems.

- Wide applicability: Galvanized pipe can be applied to different engineering projects and environmental conditions, with strong adaptability.

- Low cost, easy processing: Galvanized pipe manufacturing cost is relatively low, processing and installation is convenient, suitable for large-scale production and use.

In the construction field, galvanized pipes are often used in the construction of water supply pipes, drainage pipes, HVAC pipes and other systems. In the industrial field, galvanized pipes are often used for conveying gas, liquid and other media pipeline systems. In the field of agriculture, galvanized pipes are often used to build greenhouses and build livestock facilities.

Hot-plated pipe and ordinary galvanized pipe, although the two seem similar, but there are significant differences. These differences are mainly reflected in their production processes, performance characteristics and application fields.

First of all, from the point of view of the production process, the hot-plated tube is produced by the hot-dip galvanizing process. In this process, the steel pipe first goes through a pre-treatment process such as pickling and cleaning, and then is immersed in the molten zinc liquid, and is removed after a period of time to form a zinc-iron alloy layer. The ordinary galvanized pipe is produced by electroplating process, that is, zinc ions are deposited on the surface of the steel pipe through the action of current to form a zinc layer. These two different production processes make the performance of hot-plated pipe and ordinary galvanized pipe different.

In terms of performance characteristics, because of the hot dip galvanizing process, the zinc-iron alloy layer on the surface of the hot plated tube is closely combined with the steel tube matrix, which has good corrosion resistance and can effectively prevent the corrosion of the steel tube during use. The zinc layer of ordinary galvanized pipe is relatively thin, the binding force with the steel pipe matrix is weak, and the zinc layer is easy to fall off during use, which affects its anti-corrosion performance.

In addition, in the field of application, because of its excellent anti-corrosion performance and long service life, hot plated tubes are widely used in various fields such as construction, transportation, petroleum, chemical industry, especially those with high anti-corrosion performance requirements. The ordinary galvanized pipe is mainly used for some occasions with low anti-corrosion performance requirements, such as some temporary buildings or facilities.

In general, hot plated pipe and ordinary galvanized pipe are a kind of galvanized steel pipe, but due to the different production process and performance characteristics, they are also different in the application field. When choosing the use, we need to choose the appropriate type of steel pipe according to the specific use environment and needs.

The difference between carbon steel pipe and seamless steel pipe:

1. Seamless steel pipe is a steel pipe without weld made by perforating hot rolling method.

Sometimes it is necessary to further cold work the pipe after hot working in order to get the corresponding shape and size.

The carbon steel pipe is generally made of round, square, flat and other shapes after multiple rolling.

2. Seamless steel pipe is the most used pipe in petrochemical production equipment today.

Carbon steel pipes are more widely used.

At the same time, carbon steel pipe is the main requirement of its chemical composition is the content of carbon, seamless steel pipe is a large type, referring to seamless steel pipe, a wide range.

Stainless steel double seal pipe is a special design of the pipe, its main feature is that both the inner and outer layers are made of high-quality stainless steel material, and the double seal treatment is carried out at the interface. This design can effectively prevent the leakage of liquid or gas inside the pipeline, thus ensuring its safety and stability during use.

The inner and outer layers of the stainless steel double-sealed pipe are made of high-quality stainless steel material, which has corrosion resistance, high temperature resistance, wear resistance and other characteristics, so it can ensure that the pipe can maintain good performance in a variety of harsh environments. At the same time, the smooth surface of stainless steel also makes cleaning and maintenance work very simple.

At the interface, the stainless steel double sealing pipe adopts double sealing technology. This technique usually involves the use of special sealants or rubber gaskets to ensure the tightness of the interface. The double seal not only prevents liquid or gas leakage from the interface, but also provides additional protection when the pipe is impacted by external forces.

In general, stainless steel double-sealed pipe is a pipeline product with reasonable structure and excellent performance, which is widely used in chemical, petroleum, food, pharmaceutical and other fields.

Does 304 stainless steel pipe have a specific product classification? 

Stainless steel pipe is a kind of material widely used in various industrial fields, which has the characteristics of corrosion resistance, high temperature resistance and high strength. In the stainless steel pipe market, according to different uses and specifications, it can be divided into a variety of different types.

First of all, according to the wall thickness to divide, stainless steel pipe can be divided into thin wall pipe and thick wall pipe. Thin-walled tubes are usually used in occasions where smaller pressure or fluid flow is required, such as building decoration, mechanical parts, and so on. The thick wall pipe is suitable for engineering fields under greater pressure or with greater fluid flow, such as petroleum, chemical industry, shipbuilding and so on.

Secondly, according to the different production process, stainless steel pipes can be divided into seamless pipes and welded pipes. Seamless pipe is processed by cold drawing or hot rolling process, with high precision and surface quality. Welded pipe is made by rolling steel plate or strip into a tube, which is suitable for mass production and low cost requirements.

In addition, there are some special types of stainless steel pipes, such as ultra-low carbon 304 stainless steel pipes, nickel-based alloy steel pipes and so on. These special types of stainless steel tubes have higher strength, corrosion resistance and wear resistance, and are suitable for some areas with special requirements, such as the nuclear industry, aerospace and so on.

In summary, 304 stainless steel pipes can be classified according to factors such as wall thickness, production process and special needs to meet the needs of different industries and applications.

There may be many factors for the cause of porosity in stainless steel pipes. The following are some of the main reasons that may cause pores in stainless steel pipes:

Material issues: The use of low-quality stainless steel materials or materials that do not meet specifications can lead to the formation of pores. These materials may have defects, such as inclusions, bubbles or other unevenly distributed substances, which may lead to the formation of pores during processing.

Improper welding process: In the welding process, if the welding parameters are set incorrectly or improperly operated, such as too much current, too high voltage, too fast welding speed, etc., it may lead to overheating of the weld, resulting in porosity. In addition, the quality of the welding wire or protective gas may also have an impact on the formation of pores.

Improper heat treatment: In the heat treatment process, if the temperature is not properly controlled or the holding time is insufficient, it may lead to the internal organization of the stainless steel pipe is unstable and the porosity is generated. In addition, excessive cooling may also lead to the formation of pores.

Mechanical damage: During transportation, handling or installation, stainless steel pipes may be squeezed or hit by external forces, resulting in cracks or pores on the surface or inside. These mechanical injuries are usually related to the strength and toughness of the material.

Corrosion and contamination: Stainless steel pipes may come into contact with corrosive media or contaminants during use, which may erode the oxide layer on the surface of stainless steel, leading to the formation of pores. In addition, the cleanliness of the stainless steel surface will also have an impact on the generation of pores.

In summary, the reasons for the porosity of stainless steel pipes may be many, including material problems, welding process problems, heat treatment problems, mechanical damage, corrosion and pollution and other factors. To effectively avoid these problems, strict control and management are needed from the aspects of material selection, welding process, heat treatment, packaging and transportation.

No. 35 steel is widely used in the manufacture of various forgings and hot presses, cold drawn and top forged steel, seamless steel pipes, parts in mechanical manufacturing, such as crankshafts, shafts, pins, levers, connecting rods, beams, sleeves, wheels, washers, screws, nuts, motorcycle frames, etc.

Grades and standards

Chinese brand: 35# Standard: GB/T 699-2015

American grade: ASTM1035 Standard: ASTM A29A29M-04

Japanese brand: S35C Standard: JIS G3507
-2005

The main use of galvanizing is to prevent metal surface corrosion and oxidation.

Mainly used in the following fields:

Construction: Galvanized steel is widely used in the construction industry, such as building frames, roofs and walls. This is because galvanized steel has corrosion resistance and durability, which can extend the service life of the building.

Automotive industry: Galvanized steel is widely used in the automotive manufacturing industry, such as the manufacture of body and chassis. This is because galvanized steel can prevent the corrosion and oxidation of metal parts of the car, thereby extending the service life of the car.

Electrical industry: Cable tubes and cable jackets are usually made of galvanized steel pipes. This is because galvanized steel pipe has corrosion resistance and durability, and can be used in different environments for a long time.

Agriculture and aquaculture: Galvanized steel wire mesh and galvanized steel pipe are widely used in the agriculture and aquaculture industry, such as for fences, poultry houses and livestock houses. This is because galvanized steel wire mesh and galvanized steel pipe can prevent rust and corrosion, thereby extending the service life.

Machinery industry: Galvanized steel plates and galvanized steel pipes are widely used in the machinery manufacturing industry, such as the manufacture of mechanical parts and pipes. This is because galvanized steel plates and galvanized steel pipes have good anti-corrosion properties, which can extend the service life of mechanical equipment.

0.4 thick 36 wide galvanized steel pipe what use point ability to take on the head how? 1, the former life level, almost the use of forged home code, if the sink, kitchen table, will be used in addition to such kitchen equipment, in addition to such door. 2, located in the counterfeit feeling, ready to ceiling, wall, rolling shutter door, warm tube shell, water baffle, can be used for us also for a very long time to take good care of the new wall. 3, the use of children's clothes in the home can be used, especially refrigerators, washing machines, vacuum cleaners in household appliances, the outbreak of kindness plus such care and use. Advice through the immediate point of simple and ceremonious recommendation, buy for us 0.4 thick 36 wide galvanized steel pipe should be from what kind of take on the head a point to discuss understanding, rescue life is located in the choice of quality 0.4 thick 36 wide galvanized steel pipe what to do, good point for the use of application function use ability. When it comes to the use of 0.4 thick and 36 wide galvanized steel pipe, you may identify the Shengmin. Also protect every assembly point corrosion resistance. The good point corrosion resistance takes good care of the assembly point for the use of the application function to use the birthday, always the point for the use of the application function to use the birthday and if the point is set up, it has got quite a lot of card players. Buy for us 0.4 thick 36 wide galvanized steel pipe should be from what kind of strap on the head a point to discuss understanding, rescue life in the choice of quality 0.4 thick 36 wide galvanized steel pipe for what, good use point for the use of application function.

The popularization and application of high-precision cold-drawn precision steel pipe is to save steel, improve processing efficiency and save energy. The so-called high-precision cold-drawn seamless steel pipe refers to the strict inner and outer diameter dimensional accuracy (tolerance range), and the internal and external surface finish, roundness and straightness are good, which can greatly save machining hours, improve the utilization rate of materials, and help to improve product quality.

High precision cold-drawn steel pipe is a new type of steel pipe, its main characteristic is high precision. Usually there are two production processes of two-high rolling mill and three-high rolling mill. The precision of cold-rolled seamless steel pipe produced by three-high rolling mill is higher, which can be controlled within a few wires, but the price is relatively higher.