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1. Preparation of raw materials: select high-quality steel as raw materials, clean and straighten them, and carry out subsequent processing.
2. Smelting and continuous casting: raw materials are smelted and continuously cast to form molten steel. In the process of smelting, parameters such as chemical composition and temperature should be controlled to ensure the quality of molten steel.
3. Hot rolling treatment: after the molten steel is heated, the outer diameter and wall thickness of the tube blank are gradually reduced after rolling for many times until the required pipe diameter and wall thickness are reached. In the process of hot rolling, attention should be paid to the control of temperature, speed and pressure to ensure the rolling quality and accuracy.
4. Cold working and sizing: Seamless precision tubes of high-pressure boilers need cold working and sizing 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 steel pipe, increase the wall thickness and improve the accuracy. The 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: heat treatment is carried out on seamless precision tubes of high-pressure boilers to adjust their mechanical properties and hardness. Heat treatment generally includes quenching, tempering and annealing, which can change the internal structure of materials and improve their mechanical properties and corrosion resistance.
6. Non-destructive testing: carry out non-destructive testing on seamless precision tubes of high-pressure boilers to ensure that their internal and external quality meets the requirements. Non-destructive testing generally uses ultrasonic testing, ray testing, magnetic particle testing and other methods to detect internal and external defects and cracks of steel pipes.
7. Polishing: Polishing seamless precision tubes of high-pressure boilers to further improve their surface quality and gloss. Polishing is generally divided into mechanical polishing and chemical polishing. Mechanical polishing is to polish the surface of steel pipe by means of mechanical force, using polishing machine, grinding wheel, cloth wheel and other tools; Chemical polishing is to use chemical reagents to chemically etch the surface of steel pipe to achieve polishing effect.
8. Quality inspection and packaging: quality inspection and packaging are carried out for seamless precision tubes of high-pressure boilers to ensure product quality and transportation safety. Quality inspection includes the inspection of appearance quality, dimensional accuracy and mechanical properties, and the packaging should be properly handled as required to avoid damage during transportation. It should be noted that the hot working process of seamless precision tubes of high-pressure boilers requires high requirements, and various parameters and process conditions need to be strictly controlled to ensure the quality and stability of products. At the same time, the process steps can be adjusted and optimized according to the actual demand and product characteristics.