... : A53-A369, Q195-Q345 3.Outer Diameter: 20 - 219 mm Black annealed cold rolled steel pipeStandard: BS 1387, BS 1139, BS ... , Q195... Grade: 20#, 16Mn, A53(A,B), St37, St52, St42, S...Place of Origin: Tianjin China (Mainland) Secondary Or Not: Non ... , welcome foreign and domestic customers establishing business relations with us. Black annealed cold rolled steel pipe