... -900g/m2 3. Strong productivity GB/T 3094 erw welded hot dip galvanized carbon mild steel production hollow sections pipes and tubos ... A 53, EN 10210, EN 10219, JIS G 3466, GB/T 6728, BS 1387, BS 6323, IS : 3074, IS : 4923, DIN ... used in construction, bridge, fence, greenhouse, highway, windows of model steel door, machinery, chemical industry, supermarket goods shelf and so on ...