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Pipe flanges are manufactured in all the different materials like stainless steel, cast iron, aluminum, brass, bronze, plastic etc. But the most used material is forged carbon steel that include machined surfaces.

In addition, flanges, like fittings and pipes, for specific purposes sometimes internally equipped with layers of materials of a completely different quality as the flanges themselves, which are “lined flanges”.

The material of a flange, is basically set during the choice of the pipe, in most cases, a flange is of the same material as the pipe.

All flanges, discussed on this website fall under the ASME and ASTM standards, unless otherwise indicated. ASME B16.5 describes dimensions, dimensional tolerances etc. and ASTM the different material qualities.

A105 = This specification is the standard for forged carbon steel piping components for ambient- and higher-temperature service in pressure systems.

304 = This specification is a common standard for stainless steel due to its malleability, high corrosive resistance weld-ability.

316 = This specification is a molybdenum steel that provide excellent tensile, creep and stress-rupture strengths at elevated temperatures.

Alloy 20 = This specification is a “Super” stainless steels that was designed for maximum resistance to acid corrosion, cracking and pitting attack.

Alloy 200 = This specification is an unalloyed wrought nickel with excellent corrosion resistance, mechanical, magnetic and magnetostrictive properties.

Alloy 400 = This specification is used for its excellent combination of corrosion resistance, strength, ductility and weld-ability.

Alloy 600 = This specification is a nickel-chromium-iron alloy used for applications which require resistance to corrosion and heat.

Duplex 2205 = This specification is a ferritic-austenitic stainless steel with very good pitting and uniform corrosion resistance, as well as high mechanical strength.

https://www.trupply.com/pages/flange-types

https://www.aaronequipment.com/usedequipment/kettles/stainless-steel-kettles/48860010

Used- Trinity Kettle, 250 Gallon, SA Style, 316 Stainless Steel, Vertical. Approximate 53″ diameter x 37″ deep, flat top, hemispherical bottom. 304 Stainless jacket rated 40 psi jacket at -20 to 267 degrees F. Double Motion agitator with side scrapers and inner bar type agitator driven by a 2 hp, 3/60/230/460 volt, 1720 rpm gear motor with 30.16 to 1 ratio. Openings top: 2″ 6″ agitator. 2″ Center bottom outlet. Mounted on 3 stainless steel legs. Serial# D-8838, National Board# 6645. built 1996.