... GB 3.Use:water supply,chemical,petroleum industry 1.NameStainless steel welding neck flange2.Standard:GB14976-2002, GB13296-2007, JIS, AISI ... , 304Stanndard:ANSI,BS,DIN,UNI,JIS,GN,etcType:Welding neck flangeProduct name: Stainless Steel Flanges1. Size: 1/2" - 40" ( ... Applicaton: Ships, petrochemical, medical equipment, piping installation link Stainless Steel Welding Neck Flange-Pipe connecting parts