... 3.Dup Duplex Seamless SS Steel Tube/Pipe UNS 31803/1.4539 1) Grade: TP304/TP304L/TP316L/TP321/ ... 201/202 ,SS904L,S32750,2205,Duplex ,Titanium,Titanium alloy and ... others . 2) Standards: ASTM A312/A269/A213/SAE 789/ SAE 7903) O.D.: 6-630(NPS: 1 ... LR,GL,ABS, NK, KR, CCS. Stainless steel tube: Features:STANDARDS: AISI,ASTM,DIN,JIS,GB,GOST,ENGRADE ...