... 88, GB1220-92 implementation.or as your requirements USES Galvanized steel grating used in alloys, building materials, power plants, boilers ... also be used as a residence outside the window, balcony guardrail, highway, rail fence etc. Common specifications: No. Item ... ASTM A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc 5 Surface Treatment Black, self colour, hot dip ...