... supply,chemical,petroleum industry 1.NameStainless steel welding neck flange2.Standard:GB14976-2002, GB13296-2007, JIS, AISI, DIN, BS3.Size: ... grade300 series9.Secondary Or NotNon-secondary10.Alloy Or Not :Non-alloy11.Technique:Forged or casting12.Certification:ISO,QMS,DNV,KR ... 1000 mm). 2. Standards: ANSI, BS, DIN, UNI, JIS, GB, Non-standard etc.or as customers' drawings for special use. 3. Materials ...