Stainless Steel Flange

Stainless steel flange simplified as SS flange, it refers to the flanges that made of stainless steel. Common material standards and Grades are ASTM A182 Grade F304/L and F316/L, with pressure ratings from Class 150, 300, 600 etc and to 2500. It used in more industries than carbon steel as stainless steel has better resistant performances on corrosion environment and always provides with a good appearance.

ASTM A182 - Popular Standard for Stainless Steel Pipe Flange

For stainless steel pipe flange, common use material is ASTM A182 F304/L and F316/L.

ASTM A182: It refers to forged and rolled alloy and stainless steel pipe flanges, fittings, valves and parts for high temperature service. And it includes several grades of austenitic and ferritic-austenitic stainless steels.

Dimensions: 1/2'' to 2'', 3'', 4'', 6'' and up to 48''.
Wall thickness schedule: SCH 10S, SCH 40S, SCH STD, SCH 80S
Pressure ratings: 150#, 300#, 600#, 900#, 1500#, 2500#
Material Grade: F304, F316, F321 and more

304 Stainless Steel Flange Features

304 is a relatively versatile stainless steel that is widely used to make equipment and parts that require good overall performance (corrosion resistance and formability). In China, 304 steel is called 0Cr19Ni9 or 0Cr18Ni9 stainless steel, as 304 contains 19% Cr and 9% Nickel.

Application:

As 304 stainless steel is a widely used chromium-nickel stainless steel with good corrosion resistance, heat resistance, low temperature strength and mechanical properties. It has corrosion resistant in the atmosphere, if it is an industrial atmosphere or heavily polluted areas, it needs to be cleaned in time to avoid corrosion. Suitable for processing, storage and transportation of food. Has good processing properties and weldability. Used in plate heat exchangers, bellows, household goods, building materials, chemicals, food industry, etc.

316 SS Pipe Flange Features

Compared to 304 stainless steel, 316 stainless steel material have additionally of Nickel and Molybdenum, which in China called 18Cr-12Ni-2.5Mo steel. So normally it has extra Mo 2.0 to 3.0 percent than 304 steel. And this Mo is an element to offer better resistance for high temperature.

Therefore, It is particularly good in corrosion resistance, atmospheric corrosion resistance and high temperature strength. It can be used under severe conditions which it has excellent work hardening property (non-magnetic).

Sulfuric acid is one of the largest tonnage industrial chemical manufactured. At room temperature Type 304 is only resistant to 3% acid while Type 316 is resistant to 3% acid up to 50 °C and 20% acid at room temperature. So Type 304 is rarely used in contact with sulfuric acid. Type 904L and Alloy 20 are resistant to sulfuric acid at even higher concentrations above room temperature.

Application:

316L stainless steel flange has good anti-corrosion effect, better than 304 in seawater and other various media. So it is also regarded as ''marine grade'' stainless steel, but it is not resistant to warm sea water.

316 SS flange used for equipment resistant to sulfuric acid, phosphoric acid, formic acid and acetic acid. Applications include marine, pumping, chemical production, food industry, irrigation, and other stainless steel pipeline systems.