Galvanized Pipe/Galvanized Tube/Galvanized Steel Pipe ASTM A53 BS1387 GB/T3092 BS4568 Grade.B A53 Q235 Q195 20# Galvanized steel pipe Steel pipe OD:20-406mm WT:0.8-12MM. 1 Standard: ASTM, BS, JIS, 3. Q195,Q235,Q345 galvanized steel pipesteel pipe OD:20-406mmWT:0.8-12MM.1 Standard: GB, API, ASTM, BS, JIS,3. Q195,Q235,Q345