ASME SA209 T1 boiler superheater tube material rusts, there may be the following reasons:
1. Chloride ions exist in the use environment
Chloride ions exist widely, such as salt, sweat, seawater, sea breeze, soil and so on. In the presence of chloride ions, stainless steel corrodes rapidly, even more than ordinary low carbon steel.
Therefore, there are requirements for the use environment of stainless steel, and it needs to be wiped frequently to remove dust and keep it clean and dry.
2. No solution treatment
The alloying elements are not dissolved into the matrix, resulting in low alloy content in the matrix structure and poor corrosion resistance.
3. This material without titanium and niobium has a natural tendency to intergranular corrosion
The addition of titanium and niobium, together with stabilization treatment, can reduce intergranular corrosion.