How to choose the materials of stainless steel flanges?

Flange is a disc-shaped connecting part that is connected between pipe ends and closed at the same time. It is the most common in pipeline engineering, such as the connection of ventilation pipes.

Flange materials include carbon steel, low alloy steel and stainless steel. Among them, stainless steel is the most commonly used. So what are the materials of stainless steel flanges? How to choose?

Stainless steel flanges are available in 316 stainless steel (CF8M), 347 stainless steel (CF8C), 304 stainless steel (CF8), 304L stainless steel (CF3), and 316L stainless steel (CF3M).

Stainless Steel Forged Flanges

316 stainless steel (CF8M)

Corrosive or ultra-low temperature or high temperature non-corrosive applications;

Temperature range: -268 ℃ to +649 ℃, the temperature above +425 ℃ must specify a carbon content of 0.04% and above.

347 stainless steel (CF8C)

Mainly used in high temperature and corrosive applications;

Temperature range: -268 ℃ to +649 ℃, the temperature above +540 ℃ must specify a carbon content of 0.04% and above.

ANSI B16.5 ASTM A182 F304 blind flanges

304 stainless steel (CF8)

Corrosive or ultra-low temperature or high temperature non-corrosive applications;

Temperature range: -268 ℃ to +649 ℃, the temperature above +425 ℃ must specify a carbon content of 0.04% and above.

304L stainless steel (CF3)

Corrosive or non-corrosive applications; the temperature range up to + 425 ℃.

316L stainless steel (CF3M)

Corrosive or non-corrosive applications, temperature range up to + 454 ℃.

Note: The above five kinds of stainless steel materials refer to ASTM A351, CF8M, CF8C, CF8, CF3, CF3M castings, which are often used as valve materials.