1. Production method of boiler tubes
The production of boiler tubes mainly goes through the following steps: material selection, forming, welding, heat treatment, testing and surface treatment.
1. Material selection
The material selection of boiler tubes is the first step in production and a very critical step. High-quality raw materials can ensure the quality and performance of boiler tubes. Usually, boiler tubes are made of seamless steel pipes or welded steel pipes, mostly made of carbon steel, alloy steel, etc. When selecting materials, factors such as the working pressure, temperature, and medium of the boiler need to be considered to ensure that the selected materials can meet the use requirements.
2. Forming
Forming is the second step in the production of boiler tubes. The main forming methods are hot rolling, cold drawing, extrusion, etc. Among them, hot rolling is the most commonly used forming method. It heats the steel pipe to a certain temperature and then uses a rolling mill to roll it to make the steel pipe reach the desired shape and size.
3. Welding
For welded steel pipes, welding is an important link in the production process. The quality of welding directly affects the use effect and safety of boiler tubes. Common welding methods include manual arc welding, submerged arc welding, TIG welding, etc. During the welding process, it is necessary to select appropriate welding materials and welding processes to ensure the quality of the weld.
4. Heat treatment
Heat treatment is an important link in the production process of boiler tubes. Through heat treatment, the residual stress inside the steel pipe can be eliminated and the mechanical properties and corrosion resistance of the steel pipe can be improved. Common heat treatment methods include normalizing, annealing, quenching, etc.
5. Testing
Testing is a key link to ensure the quality of boiler tubes. During the production process, the steel pipe needs to be strictly tested, including appearance inspection, size inspection, mechanical property inspection, metallographic structure inspection, etc. Only steel pipes that pass the inspection can be shipped.
6. Surface treatment
Surface treatment is the last step in the production of boiler tubes. Through surface treatment, impurities such as oil and rust on the surface of the steel pipe can be removed to improve the corrosion resistance and service life of the steel pipe. Common surface treatment methods include sandblasting, pickling, passivation, etc.