... series, 300 series, 400serieS 3. Standard: ASTM, AISI, DIN, JIS, EN, GB 1. Size: (6mm-630mm)*(1mm-45mm)2. Material: 200 ... series, 300 series, 400series3. Standard: ASTM, AISI, DIN, JIS, EN, GB 4. Surface: white acid, annealed, black, bright, or as ... pressure test, crystal rot test, heat treatment, NDT 300 series TP 304 cold rolled Seamless Steel Pipe