Welcome to Shandong Zhishang Steel Co., Ltd.
Welcome to Shandong Zhishang Steel Co., Ltd.
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Hot-dip galvanized pipe is a special steel pipe, its surface is covered with a layer of galvanized layer, which is mainly to improve the corrosion resistance of the steel pipe. This steel pipe is mainly divided into two types: hot dip galvanized and electric galvanized. Among them, the coating of hot galvanizing is thicker, and the cost of electric galvanizing is lower, but the surface may not be as smooth as hot galvanizing.
The production process of hot-dip galvanized pipe involves the reaction of molten metal with iron matrix to form an alloy layer. In this way, the substrate and the coating can be tightly bonded together. Specifically, the process of hot dip galvanizing begins with pickling the steel pipe to remove the iron oxide on the surface of the steel pipe. After pickling, the steel pipe is washed in an aqueous solution containing ammonium chloride or zinc chloride before being fed into a hot dip bath. The advantages of hot dip galvanizing lie in its uniform coating, strong adhesion and long service life. In this process, the steel tube matrix and the molten bath will undergo complex physical and chemical reactions to form a corrosion-resistant zinc-iron alloy layer. This alloy layer is closely combined with the pure zinc layer and the steel tube matrix, and therefore has strong corrosion resistance.
In practical applications, the iron pipes commonly used in gas, greenhouses and heating systems are also galvanized. However, when the galvanized pipe is used as a water pipe, a large amount of rust and scale may be produced in the pipe. This will not only contaminate the sanitary ware, but also may breed bacteria because the tube walls are not smooth. In addition, rust may also lead to high levels of heavy metals in water, posing a serious threat to human health. Therefore, from the 1960s and 1970s, developed countries in the world began to develop new pipes and gradually banned the use of galvanized pipes. China's Ministry of Construction and other relevant departments also issued a clear document in 2000, prohibiting the use of galvanized pipes. Now, the cold water pipe in the new community has rarely used galvanized pipe, but the hot water pipe in some communities still uses galvanized pipe.
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 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.
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