If the stainless steel heat exchange tube cracks during production and use, do you know how to solve it?
First of all, we must first understand the reasons that may cause the cracking of stainless steel heat exchange tubes:
(1) Contact oxides
If the stainless steel heat exchange tube comes into contact with various chlorides or chloride-containing solutions, nitric acid, nitrate, hydroxide, hydrofluoric acid, hydrogen sulfide aqueous solution, polythionic acid, sulfuric acid and sulfurous acid, etc., it will cause stress Corrosion cracking phenomenon.
(2) Residual stress
The residual stress of the stainless steel heat exchange tube produced during welding, thermal processing, and heat treatment, as well as the assembly stress during installation, the pressure difference between the inside and outside of the tube and the temperature difference during operation will lead to mechanical stress and thermal stress, resulting in tensile stress. . The greater the residual stress, the stainless steel heat exchange tube is prone to stress corrosion cracking.
The following is the treatment for the cracking of stainless steel heat exchange tubes:
1) Stress concentration and gap generation should be avoided, and the welding process should be improved.
2) Strictly control the water quality conditions. When the Cl- concentration and oxygen content increase and cannot be lowered within a few hours, the equipment should be stopped immediately.
Therefore, when the stainless steel heat exchange tube cracks, it must be dealt with in time to avoid affecting the later use.