ASTM A105 Flange is a specification for flanges. Specifications can include flanges of various grades made of stainless steel. The flange is made of forged Carbon Steel ASTM and is intended for high temperature use. Shasan Piping Solution is a leading manufacturer and supplier of ASTM A105 flange types. https://www.shasanpiping.com/carbon-steel-a105-flanges-manufacturers-exporters-suppliers-stockists.html