... such as 201 301 304,304L,316,316L,321 and so on.3. Standard:GB,JIS,BS,DIN. ... UNI,ANSI/ASTM ASME,,API, NF ,GOST and Non Standard4. Size:1/2"-40"5. Type: ... Lap joint flanges,Welding neck flanges,Socket welding flanges and Treaded flanges,Square flanges etc.6. Pressure ratings : ... . QC staff :10-15.15. Inspection :in-house and the third party16. Used for : petroleum,chemical,power,gas,water ...