1, Galvanized steel pipes(ERW) 2, Dimension: 21.3-323mm 3, material grade: Q195-235 4,Zinc: 60-400g/m2 1) Material: Q195, Q215, Q235,Q235B2) Standards: BS1387-1985, GB/T3091-20013) Zinc coating: 60-400 g/m2 (pre-galvanized steel pipe , galvanized layer 60-80g/m2;hot dipped galvanized ,galvanized layer:250-400g/m2)4) Use: Used for low pressure liquids delivery, such as water, gas, and oil5) ...