... JB, GB, 3,Cert:TUV,ISO9001:2000,NK,BV DIN 2533 flangesize 1/2" to 24" ASME B16.524 ... ASME B16.5, ASME B16.47, ASME B16.36,DIN 86341-2000, DIN2505material Carbon steel(ASTM A105, Q235,A350LF2 ... F11,F22,F5,F9,F91,F1ECT)qualification ISO9001:2008 Quality Mangement System Certificate,ISO 14001 Environment Mangement System ... , etcSpecial design available as the requirement of customer DIN 2533 flange