... 321 Seamless stainless steel pipe & tube2) Standard ASTM A 312,213,269, GB/T 14975-02, GB/T 14976-02 etc.3 ... ) Material201, 202, 301, TP304, TP304L, TP316, TP316L, 321, 310S, SUS304, SUS304L, SUS316, SUS316L, SUS321 ... , SUS310S etc.4) Outside diameter1/8''-24'' 6mm-630mm5 ...