... 300 series, 400serieS 3. Standard: ASTM, AISI, DIN, JIS, EN, GB 1. Size: (6mm-630mm)*(1mm-45mm ... series, 300 series, 400series3. Standard: ASTM, AISI, DIN, JIS, EN, GB 4. Surface: white acid, annealed, black, ... bright, or as customers requirement NameStainless Steel tubeStandardASTM A554, A249, A269 and A270, A312 A304Material ... , NDT 300 series TP 304 cold rolled Seamless Steel Pipe