... Steel Tube/Pipe UNS 31803/1.4539 1) Grade: TP304/TP304L/TP316L/TP321/201/202 ,SS904L,S32750,2205,Duplex ,Titanium,Titanium alloy ... , DNV, LR,GL,ABS, NK, KR, CCS. Stainless steel tube: Features:STANDARDS: AISI,ASTM,DIN,JIS,GB,GOST,ENGRADE :201 ... SEA);DAF,FCA(BY TRAIN)------------------------------------------------------------------------------------- Duplex Seamless SS Steel Tube/Pipe UNS 31803/1.4539