Steel grating is a steel product made by arranging flat steel bars with a certain spacing and crossbars welded to create a grid with square or rectangular openings in the center. It is primarily used for applications such as drain covers, steel structural platform panels, and step treads for steel stairs. Crossbars are usually made of twisted square steel. Steel grating is typically made from carbon steel and is externally hot-dip galvanized to prevent oxidation. Stainless steel can also be used.
In China, the standard for steel grating is YB/T4001.1-2007. Additionally, the United States, the United Kingdom, Australia, and New Zealand each have their own standards. Steel materials conform to GB700-88 and GB1220-92.
(1) Surface Treatment: Hot-dip galvanizing, cold galvanizing, or painting.
(2) Bearing Bar Spacing: The center-to-center distance between two adjacent bearing bars is commonly 30mm or 40mm.
(3) Crossbar Spacing: The center-to-center distance between two adjacent crossbars is typically 50mm or 100mm, although custom sizes are available.
(4) Bearing Bars: Commonly used types include 20X3, 25X3, 30X3, 32X3, 32X5, 40X4, 50X5, etc.
Steel grating exhibits characteristics such as an attractive appearance, excellent drainage, strong corrosion resistance, low maintenance, anti-theft, cost savings, and high strength. It is available in various specifications.
Two primary methods can be used for fixing steel grating—welding and clamping. Welding offers the advantage of maximum stability, preventing loosening. Welds are typically located at every corner and each bearing bar of the steel grating, with weld lengths not less than 20mm and heights not less than 3mm. Clamping, on the other hand, is less destructive to the hot-dip galvanized layer and allows for easier disassembly. Each panel typically requires at least four sets of clamps, with the number of clamps increasing with panel length. The safest method is to forgo clamps and directly weld the bolt heads onto the beams, ensuring that the steel grating remains securely in place without the risk of detachment.
Series 1 (30mm Spacing): This is the most commonly used type of steel grating, with applications spanning various industrial sectors. The center-to-center distance of bearing bars in this series is 30mm, in compliance with U.S. standards. It is widely used in power plants, refining facilities, wastewater treatment plants, granaries, chemical factories, highways, airports, docks, platforms, walkways, drainage covers, stair treads, and more. Tooth-shaped steel grating can be used in wet and slippery areas, especially suitable for offshore oil platforms.
Series 2 (40mm Spacing): This series is the most economical and lightweight, conforming to British standards for fixed platforms, walkways, and staircases. It is ideal for applications with smaller spans and can withstand loads, even in situations like equipment walkways.
Series 3 (60mm Spacing): This series was developed specifically for the mining industry to address the problem of mineral splatter on the grating surface. It features a nominal opening size of 50x60mm, allowing most splatters to pass through, thus ensuring a clean and safe surface. This product is commonly used in crushing system surfaces, conveyor walkways, ball mills, processing plants, and transfer stations.
