Wuxi Duorunde Steel Tube Co., Ltd (I'll answer); ? The hot working process of high pressure boiler seamless precision tubes mainly includes the following steps:
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1.Preparation of raw materials: choose high-quality steel that meets the requirements as raw materials, and clean, straighten and other treatments for subsequent processing. ?
2. Smelting and continuous casting: the raw materials are smelted and continuously cast to form steel. The smelting process requires control of parameters such as chemical composition and temperature to ensure the quality of the steel.
3. Hot Rolling Process: The molten steel is heated and then rolled in multiple passes to gradually reduce the outer diameter and thickness of the billet until the desired diameter and wall thickness are achieved. Hot rolling process needs to pay attention to the temperature, speed and pressure and other parameters of the control, in order to ensure the rolling quality and precision.
4. Cold working and sizing: high pressure boiler seamless precision tubes need to be cold worked and sized to further improve their accuracy and dimensional stability. Cold working includes cold drawing, cold rolling, extrusion and other processes, which can reduce the outer diameter of the tube, increase the wall thickness, and improve precision. Sizing treatment is carried out by a special sizing machine, which can ensure the dimensional accuracy and straightness of the steel pipe.
5. Heat treatment: High pressure boiler seamless precision tubes are heat treated to adjust their mechanical properties and hardness and other parameters. Heat treatment generally includes quenching, tempering, annealing and other processes, which can change the internal structure of the material, improve its mechanical properties and corrosion resistance and so on.
6. Non-destructive testing: non-destructive testing of high-pressure boiler seamless precision tubes to ensure that their internal and external quality meets the requirements. Nondestructive testing generally uses ultrasonic testing, ray testing, magnetic particle testing and other methods to detect defects and cracks in the internal and external steel tube.
7. Polishing treatment: high-pressure boiler seamless precision tubes are polished to further improve their surface quality and gloss. Polishing is generally divided into mechanical polishing and chemical polishing in two ways. Mechanical polishing is through the use of polishing machines, grinding wheels, cloth wheels and other tools, with the help of mechanical force on the surface of the steel tube polishing treatment; chemical polishing is through the use of chemical reagents on the surface of the steel tube chemical corrosion treatment, in order to achieve the polishing effect.
8. Quality inspection and packaging: quality inspection and packaging of high-pressure boiler seamless precision tubes are carried out to ensure product quality and safe transportation. Quality inspection includes testing of appearance quality, dimensional accuracy, mechanical properties, etc. Packaging should be properly handled in accordance with the requirements to avoid damage during transportation. It should be noted that the thermal processing of high-pressure boiler seamless precision tubes requires high requirements, and it is necessary to strictly control the parameters and process conditions to ensure the quality and stability of the products. At the same time, according to the actual demand and product characteristics, the process steps can be adjusted and optimized.