... A105 3.Standard:ANSI B16.5 4.Certification:API carbon steel forged long welding neck flangesize 1/2" to 24 ... , 2500Lbs,Etc /PN6,PN10,PN16,PN20,PN25,PN40/ Class A, B, C, D, EstandardASME B16.5, ASME B16. ... F347,F310F44F51,A276 S31803, A182, F43,Etc)Alloy steel(ASTM A694 F42,F46,F52,F56,F60,F65,F70, ... from AQSIQ , passed the Authentication of API and became a member of first – grade supply network of State ...