Name: American standard seamless carbon steel tubeBrand and grade: A53Standard: ASTMSpecification: OD20 x 1.5mm - OD121 x 15mmThis spec also confirms to DIN EN 10297Seamless steel tubes in liquid transportation are mainly applied to petroleum andgas long-distance transportation, as well as industrial and civilian liquid transportationsystem. Structure usage is also adaptive. producing area:China payment:L/C or T/T