... .Material:GB/ASTM/JIS/DIN Black annealed cold rolled steel pipeStandard: BS 1387, BS 1139, BS EN10025, BS EN 3... Grade: 10 ... #-45#, 16Mn, A53-A369, ST35-ST52, Q195... Grade: 20#, 16Mn, A53(A,B), St37, St52, St42, S...Place of Origin: Tianjin China ... , welcome foreign and domestic customers establishing business relations with us. ASTM A106 GR.B Cold rolled steel pipe