Product Name: STM A213 seamless stainless steel U-tube for heat exchanger and boiler Process method: Cold drawn/ Cold rolled Material: 304/ L/ H, 316/ L/ H/ TI, 321/ H, 347/ H, 317L, 309S/ H, 310S/ H, SAF2205( S31803) , SAF2507( S32750) , 904L... Surface finish: annealed& pickled Standards: ASTM( ASME) SA/ 213 Size: O.D.: 6.35mm--141.3mm W.T.: 0.5mm--10mm Packing: wooden case contact: soldierxu( at) gmail( dot) com