Stainless Steel Tube 1) Grade : 321, 304, 304L, 316, 316L, 317, 317L,310s ... : GB/ASTM/ASME/DIN/JIS 3) TPI:SGS,BV. Stainless Steel Tube Features:1) pipe diameter : 6mm-630mm pipe thickness : 0. ... third part inspection.12.capacity:500 ton per monthtype stainless steel tube size6mm-630mm pipe thickness : 0.8mm-25mmgrade321, 304, 304L, ... assure of our best attention all the time. 304 Stainless Steel Tube