... ; (1)Standard:ASTM A53 BS 1387 GB/T3091 (2)Material:20#,Q195,Q235,Q345,St 52,St 37(3)OD: 5mm ... Pipelines, Waste waterlines , Water supply mainsDeep tube wells casing pipes, Gas/Natural gas pipe lines, Oil pipe lines, LPG & other non-toxic ... gas pipelinesIndustrial Purposes, Sewerage system, Industrial water lines/plant piping, Vehicular ...