AISI 347 SS, just like the materials AISI 304L SS / AISI 316(L)SS, AISI 316 UG, SS AISI 321SS are part of the austenitic stainless steels group. AISI 347 is often used specific industrial processes, especially concerning elevated temperature, corrosion resistance, and susceptibility to intergranular corrosion. Compared to AISI 316(L), AISI 347 is selected offers higher resistance to Intergranular Corrosion (due to Nb stabilization) and have better stability at high temperatures.
Below a picture of the sample diaphragm. The diaphragm is also suitable in combination with all available coatings. Also, the diaphragm materials is integrated in Badotherm Basecal tool, since the it has different flexibility characteristics than the other materials.
AISI 347 is specifically designed to withstand prolonged exposure to elevated temperatures (above 500°C) without suffering from sensitization (chromium carbide precipitation at grain boundaries), which leads to intergranular corrosion. This makes it ideal for application such as heat exchangers, superheaters or furnaces
AISI 347 offers superior resistance to thermal fatigue and oxidation scaling in cycling conditions, such as Steam lines in power plants, Catalytic converters or Chemical process lines where fluids alternate in temperature
❌ When Not to Choose AISI 347
- For marine environments or applications involving chloride exposure, AISI 316 (with its Mo content) provides superior pitting and crevice corrosion resistance.
- For general-purpose corrosion resistance at moderate temperatures, AISI 316 is often more cost-effective and sufficient.
For the extensive list of diaphragm foils we have available please check out the datasheet of the BRF or BF-FSO constructions or look at our high end material section at the website.
