EN 10210 HOT FORMED HOLLOW SECTION

In steel pipe production, thermoforming is a metal forming process that is completed above the recrystallization temperature. Specifically, thermoforming technology involves heating the joints of pipe fittings and then heat shrinking them with a mold. After repeated heat shrink treatment, the joints of the pipe fittings are gradually formed. Finally, the inner core is extruded and fused to form the design shape. This process can achieve local heating and plastic deformation of metal materials, so as to improve the molding performance of the material and reduce the molding difficulty.

In the production process of steel pipes, thermoforming usually includes the following steps:

1. Heating the tube billet: heating the tube billet or steel ingot to a certain temperature to make it reach a thermoplastic state, which is convenient for subsequent molding processing.
2. Perforation: The heated solid tube blank is perforated through the perforator to form a hollow tube.
3. Rolling: the perforated tube is extended on the rolling mill so that its diameter and wall thickness are close to the finished size.
4. Sizing reduction: further sizing of the tube through the sizing machine, so that it reaches the exact size of the finished product.
5. Cooling: The steel pipe after forming needs to be cooled to fix its shape and size.
6. Finishing: Surface treatment and size correction of the cooled steel pipe to meet the quality requirements of the final product.

Because the thermoformed steel pipe is formed at high temperature, it has good plasticity and ductility, and can produce high-strength and high-precision steel pipe products. This process is especially suitable for the production of large diameter, thick wall or special shape steel pipe.

Thermoformed steel pipe has been widely used in many fields because of its high strength, light weight and corrosion resistance.

1. Automotive field: Thermoformed steel pipes are widely used in automotive manufacturing, mainly for the production of body structure parts, instrument panels, interior parts, etc. Through thermoforming technology, auto parts with high strength, high stiffness and light weight can be manufactured to improve the safety performance and fuel economy of automobiles.
2. Construction industry: Under the background of pursuing green building, energy saving and emission reduction, thermoformed steel pipes are widely used in the construction of large public facilities such as Bridges, high-rise buildings and stadiums because of their high strength, light weight and corrosion resistance.
3. Machinery and equipment industry: Thermoformed steel pipes also play an important role in the manufacture of machinery and equipment, especially in heavy equipment that needs to withstand huge forces and pressures, such as excavators, loaders, cranes, etc., which have extremely high requirements for the strength and toughness of materials.
4. Petrochemical field: Thermoformed steel pipes are used as manufacturing materials for pipelines and containers, and these equipment need to have good corrosion resistance and pressure resistance, and thermoformed steel pipes are such an ideal choice.
5. Home appliance industry: With the improvement of consumer requirements for the quality and appearance of home appliance products, home appliance manufacturers have become more selective in their choice of materials. Thermoformed steel pipe has become an ideal material for manufacturing high-end home appliances due to its excellent formability, surface quality and mechanical properties.

• Higher strength and toughness: The thermoformed steel pipe is plastic deformed at high temperature, the grain of the material is refined, and the mechanical properties are improved. The thermoformed steel pipe has a higher tensile strength, which can be increased by 2-3 times, making the structure safer.
• Weight reduction: Due to the extremely high material strength of thermoformed steel pipes, many ordinary steel plate parts can be replaced with less materials, effectively reducing the weight of the vehicle and saving energy consumption.
• Good formability: Thermoformed steel pipe is not easy to wrinkle and break during the forming process, basically no rebound, good dimensional stability.
• Reduce material use and cost: Thermoformed steel pipes can form complex parts at one time without welding, reducing the use of materials and manufacturing costs.
• Improve the yield: there is no problem of cracking and wrinkling in the hot forming process, which improves the yield, especially in the processing of high-strength steel, the yield can be increased by more than 10%.
• Reduce equipment investment and energy consumption: Thermoforming can reduce the tonnage of the press, reduce equipment investment and energy consumption.
• Corrosion resistance: The surface of the thermoformed steel pipe is smoother, which helps to reduce the resistance of the fluid inside the pipe, improve the transmission efficiency of the pipe, and also improve the corrosion resistance.
• Long service life: Because the thermoformed steel pipe has better corrosion resistance, its service life is relatively long, reducing the frequency of maintenance and replacement.
• Environmental protection and energy saving: The production process of thermoformed steel pipes can better meet the requirements of environmental protection and energy saving, and the recycling rate of steel pipes is higher, reducing resource waste and environmental pollution.