hot-dip galvanized steel grating material: Q235,Q255,Q305,Q405,etc. manufactures bearing bar pitch:30-90mm ISO9001/2000 1.stainless steel floor grating Materials:Q235, Q255,Q305,Q355,Q405, etc.2.Steel grating Limited manufactures three different types of steel grating, each with different specifications and suitability.Series 1: 30mm centres Suitable for heavy loading Available in mild steel ( ...