standard:AISI, ASTM, GB, DIN grade:2205 317 317L 316 316L 310 310S ... , 304L, TP304, TP304L, 316L, TP316L, 321, F321, etc.StandardISO 9001/ ASTM A269/ A270/ A312/ A213, GB/T 14976/ GB/T 13296 ... ~26.00 3.production process4.predeliverytest5.package 6.contact us ASTM A312 316L Seamless stainless steel pipe