steel pipes Outer ID: 20mm-219mm Wall thickness: 0.8mm-8mm steel pipesOuter ID: 20mm-219mmWall thickness: 0.8mm-8mmMaterial: Q195, Q215, Q235, Q345Standard: ASTM-A53A, BS1387-1985, GB/T3091-2001Application: oil pipe, gas pipe, fluid pipe, hydraulic pipe etc. steel pipes