1)stainless/carbon steel 2)DN10-500&3/4-25"or bigger 3)ISO9001:2000 4)GB,HG,JB,BS,JIS. Stainless steel welding neck flange Feature: Stainless steel welding neck flangeSpecification: DN10-500&3/4"-25"or biggerStandard: GB,HG,JB,BS,JIS,DIN,ANSI,ISO,JPI,ASME...Application: dairy products,beer,food,cosmetics and chemical industryMaterial:stainless /carbon steel Stainless steel welding neck flange