Bright annealing is an annealing process performed in a vacuum or a controlled atmosphere containing inert gases (such as hydrogen). This controlled atmosphere reduces the surface oxidation to a minimum which results in a brighter surface and a much thinner oxide layer. Pickling is not needed after bright annealing since the oxidation is minimal. Since there is no pickling, the surface is much smoother which results in better resistance to pitting corrosion.

The bright treatment maintains the smoothness of the rolled surface, and the bright surface can be obtained without post-processing. After bright annealing, the surface of the steel tube retains the original metallic luster, and a bright surface close to the mirror surface has been obtained. Under general requirements, the surface can be used directly without processing.

For bright annealing to be effective, We do the tube surfaces clean and free of foreign matter before annealing. And we keep the furnace annealing atmosphere is relatively free of oxygen (if a bright result is desired). This is accomplished by removing nearly all gas (creating a vacuum) or by displacement of oxygen and nitrogen with dry hydrogen or argon.

Vacuum bright annealing produces extremely clean tube. This tube meets the requirements for ultra high purity gas supply lines such as internal smoothness, cleanliness, improved corrosion resistance and reduced gas and particle emission from the metal.

The products are used in precision instruments, medical equipment, semiconductor industry high purity pipeline, automobile pipeline, laboratory gas pipeline, aerospace and hydrogen industry chain (low pressure, medium pressure, high pressure) Ultra high pressure (UHP) stainless steel pipe and other fields.

We also have over 100,000 meters of tube inventory, which can meet customers with urgent delivery times.