carbon seamless steel tube 1)specification: ASTM A312,A213,A269, A789 2)OD(6-273MM) WT0.5-16MM carbon seamless steel tube1)specification: ASTM A312,A213 ... ,A269, A789 2)OD(6-273MM) WT0.5-16MM carbon seamless steel tube1)specification: ASTM A312,A213,A269, A7892) OD: 6 ... authentication, PED, DNV and Lloyd's certification successfully 304,304Lseamless carbon steel tube