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1. Perforation process: Perforation is the first process for manufacturing cold-drawn steel pipes. For high-precision, high-strength and high-temperature resistant steel pipe materials such as cold-drawn precision seamless steel pipe, Wuxi large-diameter cold-drawn pipe, 15CrMo thick-wall cold-drawn steel pipe and precision cold-drawn alloy pipe, the piercing process is particularly critical. In the process of piercing, advanced piercing equipment and technology, such as multi-roll piercer and plug piercer, are adopted to realize accurate size control and good surface quality. ?
2. Cold drawing process: Cold drawing is the core process for manufacturing cold-drawn steel pipes. For steel pipes with high precision, high strength and high temperature resistance, the cold drawing process is more stringent. In the process of cold drawing, multi-pass cold drawing is used to reduce the diameter. By selecting the appropriate cold drawing die and adjusting the parameters such as cold drawing speed, accurate size control and shape accuracy are achieved. For materials such as precision cold-drawn alloy pipes, special molds and lubricants are needed to reduce friction and protect the surface quality of steel pipes.
3. Reducing process: Reducing is one of the important processes for manufacturing cold-drawn steel pipes. After many times of reducing, the diameter of the tube blank gradually decreases, reaching the required dimensional accuracy and shape. In the process of reducing diameter, advanced reducing equipment and technology, such as hydraulic reducing mill and mechanical reducing mill, are adopted to realize accurate size control and shape accuracy. For the manufacture of large-diameter steel pipes such as Wuxi large-diameter cold-drawn pipe, it is necessary to take measures such as expanding diameter technology to increase the diameter of pipe blank and improve the strength and stability of steel pipe.
4. Heat treatment process: Heat treatment is one of the key processes for manufacturing cold-drawn steel pipes. Through high temperature heating and cooling, the microstructure and mechanical properties of steel pipes change. Heat treatment technology is particularly important for steel pipe materials with high precision, high strength and high temperature resistance. In the heat treatment process, advanced heat treatment equipment and technology such as vacuum heat treatment furnace and oil quenching are adopted to achieve excellent mechanical properties and stable dimensional accuracy. For the manufacture of high-alloy steel pipes such as 15CrMo thick-walled cold-drawn steel pipes, it is necessary to adjust the microstructure by high-temperature tempering and other measures to improve the corrosion resistance.
5. Surface treatment technology: Surface treatment technology is also particularly important for steel pipe materials with high precision and high surface quality, such as precision cold-drawn alloy pipes. In the manufacturing process, advanced surface treatment equipment and technology, such as polishing, zinc plating and plastic spraying, are adopted to achieve excellent surface quality and stable corrosion resistance.
6. Quality inspection process: Quality inspection is one of the necessary processes for manufacturing cold-drawn steel pipes. Through a series of quality inspection means and methods, such as eddy current flaw detection, ultrasonic flaw detection, metallographic analysis and so on. , can detect whether the internal quality and surface quality of steel pipes meet the requirements. For high-precision, high-strength and high-temperature resistant steel pipe materials, the quality inspection process is more stringent. In a word, in the manufacturing process of cold-drawn precision seamless steel pipe, Wuxi large-diameter cold-drawn pipe, 15CrMo thick-wall cold-drawn steel pipe and precision cold-drawn alloy pipe, some special technological methods, such as piercing, cold-drawn technology, reducing diameter, heat treatment, surface treatment and quality inspection, are adopted to achieve accurate size control, excellent surface quality and stable mechanical properties. The selection and use of these special processes depend on specific materials, mechanical performance requirements and production conditions.