... DIN, ASTM 3.Grade :20#.45# 16Mn Q235 1. seamless steel pipe/tube2.Standard: BS, JIS, GB, DIN, ASTM 3.Grade :20 ... 2.5-60mm5.Type :Hot rolled ,cold drawn or precision cold rolled steel tubes are avalible here6.Application use for oil well ... , boilers, precision machines, petro-chemical, ship, structure pipe, automobile,shock absorber, ...