English
中文简体In stainless steel tube manufacturing, annealing is an important process. It reduces hardness, increases ductility, and eliminates internal stresses in the material. It also provides a better appearance and surface for further processing, such as machining and polishing. Bright annealing is the most common type of annealing, but several variations can be used to achieve different results.
To ensure that the finished product has good quality, bright annealing is carried out in a controlled atmosphere. The atmosphere should be free of oxygen and isolating, creating a vacuum condition. This will avoid oxidation as much as possible and ensure that the final product has a bright finish. It is also important that the annealing atmosphere is consistent to ensure that each batch of tube has the same appearance and quality.
The brightness of a stainless steel tube is influenced by many factors, including the type of heat treatment, the cooling section, and the atmosphere. The tube must be annealed properly to ensure it has a high-quality finish and is suitable for use in any application. In addition, the heat treatment process can affect the formability of the tube, so it is necessary to consider the impact of the annealing process on the forming ability.
To obtain the desired brightness, the tube must be annealed in a furnace with a controlled atmosphere. The atmosphere should be protected against oxidation, and the surface of the steel strip must not be exposed to oxygen. To prevent this, the inlet and outlet seals of the annealing furnace must be carefully maintained. In addition, a gas with a low molecular weight should be inserted into the annealing furnace to prevent oxygen from entering.
Another factor influencing the brightness of stainless steel tubes is the temperature and length of the annealing cycle. It is important to know the exact annealing temperature and duration of time, as well as the temperature gradient and cooling rate, to achieve the best result. In addition, the annealing temperature must be consistent from batch to batch to guarantee consistent quality.
Baorui’s stainless steel unpolished welded bright annealing tubing is manufactured according to ASTM A269. The tubing is made from cold rolled stainless steel strip that has chemical elements specially controlled to enhance weldability. The weld bead is cold-worked to a fully finished condition for a virtually undetectable longitudinal weld and then bright annealed in a protective atmosphere to preserve maximum structural integrity. Our tubing is suitable for a variety of applications and industries, particularly in chloride (seawater) environments. To learn more about our tubing, contact us today.
