About steel pipe manufacturing process

hot dip galvanized steel pipe manufacturing process Hot dip galvanizing (English name: Galvanizing, also known as hot-dip galvanizing or hot-dip galvanizing, is an effective method of metal corrosion prevention, mainly used on metal structural facilities in various industries.It is to immerse the rust removed steel components into a molten zinc solution at around 500 ℃, so that a zinc layer adheres to the surface of the steel components, thereby achieving the purpose of corrosion prevention. Hot dip coatingFeng process flow: finished product pickling: water washing, adding cooking solution, drying, hanging mirror: cooling, chemical cleaning and polishing: hot coating completion, hot mixing is developed from the ancient hot plating method, which has a history of more than 170 years. In the past thirty years, with the rapid development of cold-rolled steel strips, the thermal cracking industry has been able to achieve large-scale productionModel development.Hot dip galvanizing production processLoading, acid washing, water washing, solvent drying, hot-dip galvanizing, internal and external blowing, rolling, marking, passivation, inspection, packagingHot-dip galvanizing stepsThe hot-dip galvanizing of steel pipes adopts the mechanical principle of dialing in, pressing down, spiraling, pulling out and lifting in a fully immersed semi-automatic galvanizing method with a toothed disc to complete the hot-dip galvanizing process.1. Process parameter control: the temperature of the zinc liquid should be controlled between 440-460℃; the zinc dipping time should be controlled between 30-60 seconds; add aluminum (the aluminum content of the zinc liquid surface is 0.01-0.02%)2. The zinc ingot used should be the national standard Zn0-3 zinc ingot.3. Regularly maintain and control the reliability of the pull-in, press-down spiral, pull-out and lifting device, strengthen the lubrication of the cylinder, adjust the height and angle of the galvanized pipe distributor, and adjust the equipment to the best state.4. The placement of the proximity switch should be accurate; the thermocouple wire and the meter should be used with the same model, otherwise, the temperature error will be large, and the protective sleeve of the thermocouple should be checked and replaced frequently.The operator at the operating table should adjust the speed manually according to the operation of the equipment in front of the furnace and the hand gesture command to prevent the pipe from getting stuck.6. The tools used by the furnace workers should be preheated before use to prevent zinc splashing and injuring people; check frequently whether there are steel pipes falling into the pot, and clear them out if necessary; adjust the equipment in time to avoid pipe jams to ensure the safety of the equipment.The zinc ingot should be placed vertically against the wall of the zinc pot and slowly drawn down to avoid impact damage to the zinc pot and splashing a large amount of zinc to injure people; iron substances are strictly prohibited in the zinc liquid. 7. When adding zinc to the zinc pot, the zinc ingot should be preheated first. When adding zinc, it is not allowed to add zinc in bundles. No more than five pieces of zinc should be added each time to prevent the generation of a large amount of zinc slag. 8. When melting zinc, it should be heated slowly, and it should not be burned quickly, otherwise it will damage the life of the galvanizing pot, and a large amount of zinc vapor will evaporate. If this harmful gas is inhaled excessively by the human body, it will cause a disease called "foundry fever". During the zinc melting process, once the zinc has reached a high temperature, you must not move the zinc block by hand to avoid burns. You should use appropriate tools to move it.9. Clean the zinc ash on the surface of the zinc liquid regularly. When scraping the ash, you should gently scrape it on the surface of the zinc liquid with a scraper. Do not stir it too hard to avoid the zinc ash flying. The scraper should not collide with the steel pipe that is being zinced or discharged to avoid rolling and causing personal accidents or equipment accidents. 10. The zinc blocks, broken zinc, zinc brought out during galvanizing, and zinc flowing out of the steel pipe on the ground in front of the furnace should be recovered and returned to the pot at any time to reduce the heat loss of the zinc pot.11. When adding aluminum ingots to the surface of the zinc liquid, be sure to move it back and forth several times to ensure that the aluminum content on the surface of the zinc liquid is uniform.12. In order to facilitate slag removal and zinc extraction, 20 tons of lead should be placed inside the zinc pot.13. When scooping slag, the slag scoop machine must be preheated. The zinc slag should be stored in large and small pieces. The slag temperature should be controlled above 455℃. Special tools must be used when using the swing slag grabber. Keep your feet 1 meter away from the zinc pot and stand in a T shape. 14. The hot-dip galvanizing process has strict requirements, so in the hot-dip galvanizing production process, you must do enough work. That is to say, the more roots or tonnage per unit time, the lower the cost, and vice versa.

Electric Resistance Welded Pipe (ERW) is a steel pipe manufactured by high-frequency resistance welding technology. This production method is known for its high efficiency, high quality and flexibility, and is widely used in oil and gas transportation, building structures, machinery manufacturing and other fields. The following are the main production process steps of electric resistance welded pipe:1. Raw material preparationSelection of strip steel or steel plate: Select the appropriate strip steel or steel plate as the raw material according to the required final product specifications.Pretreatment: Clean, straighten and flatten the strip steel to ensure that the surface is clean and free of impurities to ensure the quality of subsequent processes.2. FormingCurling: The strip steel is gradually bent into a circular cross-section through a series of rollers. The design of each roller is precisely calculated to ensure that the strip steel can be smoothly formed into the required diameter and wall thickness.Pre-bending: During the forming process, the edges of the strip steel are usually pre-bent to make them easier to butt and weld.3. WeldingHigh-frequency resistance welding: This is the core step in the production of ERW pipes. The resistance heat generated by high-frequency current is used to melt the edges of the strip steel, so that the edges on both sides are fused under pressure to form a weld. The process does not require additional filler materials, ensuring the consistency of the weld joint with the parent material.High-frequency power supply: Provides sufficient power to generate high-frequency current.Induction coil: Surrounds the area to be welded and heats the edge of the strip to the melting point by electromagnetic induction.Squeeze roller: Apply appropriate pressure to make the molten edges tightly bonded to form a solid weld.4. Sizing and coolingSizing machine adjusts the size: After welding, the steel pipe passes through the sizing machine to further adjust its outer diameter and inner diameter to ensure that the dimensional accuracy meets the standard requirements.Natural cooling or forced cooling: The steel pipe can be cooled naturally or accelerated by air cooling, water cooling, etc., depending on the speed of the production line and the final use of the product.5. Inspection and testingAppearance inspection: Visually inspect the surface of the steel pipe for obvious defects such as cracks, pores, etc.Dimension measurement: Use tools such as calipers and micrometers to measure key dimensions such as diameter and wall thickness of the steel pipe.Non-destructive testing: Use ultrasonic testing (UT), magnetic particle testing (MT), penetrant testing (PT) and other methods to detect potential defects inside and on the surface.Water pressure test: Carry out water pressure test on finished steel pipes to verify their sealing and pressure resistance.6. Finishing and Packaging End processing: Cut, chamfer or perform other necessary processing on both ends of the steel pipe according to customer needs. Painting and marking: To prevent corrosion during transportation and storage, the surface of the steel pipe may need to be painted or galvanized, and product information labels may be stamped. Packaging and delivery: Qualified products are packaged according to customer requirements and prepared for delivery. Key technologies and equipment High-frequency welding equipment: including high-frequency power supply, induction coil and extrusion roller, is the key to achieving efficient and high-quality welding. Automation control system: Modern ERW production lines are equipped with advanced automation control systems that can monitor and adjust various process parameters in real time to ensure the stability and consistency of production. Quality inspection system: From raw materials to finished products, a strict quality inspection system is equipped throughout the process to ensure that each steel pipe meets high standards. Advantages High efficiency: Compared with seamless steel pipes, ERW pipes are produced faster and at lower costs. High quality: By precisely controlling welding parameters, high-strength and stable performance welds can be obtained. Flexibility: The production line can be quickly adjusted according to market demand to produce steel pipes of different specifications and lengths. Environmentally friendly: Since no additional welding materials are required, waste generation is reduced, which is in line with the concept of green manufacturing. Application areas ERW pipes are widely used in many industries due to their excellent mechanical properties and economy: Oil and gas transportation: long-distance oil and gas pipelines, submarine laying, etc. Building structures: infrastructure construction such as high-rise buildings, bridges, tunnels, etc. Machinery manufacturing: automotive parts, engineering machinery, etc. Water conservancy projects: irrigation channels, drainage networks, etc. Chemical equipment: piping systems exposed to corrosive chemicals. Summary The production process of electric resistance welded pipe (ERW) combines advanced forming and welding technologies, which can improve production efficiency while ensuring product quality. With the advancement of technology, the application range of ERW pipes continues to expand, becoming the preferred material in many engineering projects. If you have more specific questions about ERW pipes or need further help, please feel free to let me know. I hope the above information can provide you with valuable reference.

Understanding of OEM, ODM and OBM is an essential step for every e-Commerce sellers and for those people who want to start their importing or exporting business. - OEM (Original Equipment Manufacturer): An OEM factory has minimal input into any part of a brand’s production process, focusing only manufacturing processes. The factory simply follows the instructions given by the brand or the consulting company ordering a production. - ODM (Original Design Manufacturer): The ODM factory has the capability of designing the products. The importer will select the already-existed product design, use their brand name to sell the products by labeling the products or use specific package to makes the products could be recognized as their brand products. - JDM (Joint Design Manufacturers): JDM (Joint Design Manufacturers) can be considered as a variation or even as an extension to ODM. The company outsources a product from a manufacturing entity, works in close cooperation across all aspects of design and manufacturing. The teams from both sides work together as one on tackling obstacles, design revisions and testing implementation. - OBM (Original Brand Manufacturer): The OBM factory takes care of the entire production procedures, from design, engineer, manufacture, supply chain to marketing. OBM fully owns the brand and products. Most importers buy products from ODM factories as it will be simple, quick and easy way to put the branded products into the market. If you have strong Research & Design team, and want to sell your own products, like Apple, you can work with OEM factories.