The composite steel grate is made up of a steel plate with a certain span capacity and a tread plate on the sealing surface. It can be made with any type of steel grate and different thickness tread steel plates. His advantages are as follows: 1. High strength, light structure 2. Strong anticorrosion and durable 3. Beautiful appearance, bright surface 4. Do not accumulate dirt, not rain snow, not water, self clean, easy maintenance 5. Ventilation, lighting, heat dissipation, skidproof, and good explosion-proof. 6. Easy to install and disassemble. Steel grating size: 1m*6m standard type (special size and american standard size are also customizable) Material: low carbon steel (q235)=a36 Surface treatment: hot dip galvanizing, paint or no coating Surface shape: plain, serrated and i type Steel grating standard: chna yb/t40 01 - 2007 America ansi/naamm ( mbg531- 88) Britain bs4592-1987 Australia as1657 -1992 Steel standard: china gb700- 88 / astm (a36) / bs4306 (43a) Hot dip galvanizing standard: china gb/t13912-92 / astm (a123) / bs729 Technological process (1) material (2) pressure welding (3) cutting (4) welding of ends bar (5) hot dipped galvani-zation (6) final shipment -