Welded Bar Grating is made of flat steel and bars by welding with certain distances. The bearing bars are automatically resistance welded at the contact point with the cross bars and, under a combination of high heat and pressure, are fused together to form a permanent joint. The cross bars provide a high degree of rigidity, yet retain a smooth flat surface for free and easy walking.
It goes through cutting, opening, edging and other processes. The products enjoy the features of high strength, light structure, high bearing, convenience for loading and other properties. The hot dipped zinc coating gives the product excellent anti-corrosion resistance.
The type of grating is indicated by a letter as follows
W welded
P press locked
BEARING BAR SPACING
Bearing bar spacing is designated by mm
For welded or press-locked grating, it’s the distance center to center of bars
CROSS BAR SPACING
For welded or press-locked grating, it’s the distance center to center of cross bars
Press-locked grating
Compound steel grating
STANDARD OF GRATING
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Standard for steel grid
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Steel material
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Hot-dip-galvanization
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China
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YB/T4001-1998
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GB700-88
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GB/T13912-92
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USA
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ANSI/NAAMM(MBG531-88)
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ASTM（A36)
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ASTM(A123)
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UK
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BS4592-1987
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BS4360(43A)
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BS729
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Australia
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AS1657-1985
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AS3679
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AS1650
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SIZE OF BEARINGBARS
The size of bearing bars is expressed in mm of depth and thickness as follows
20*3 32*3
20*5 32*5
25*3 40*3
25*5 40*5
30*3 50*3
30*5 50*5
MATERIAL
Carbon steel , Stainless
FINISH: mill finish, paint, galvanized as specified
APPLICATION
Steel grating is widely used in the platform, corridor, bridge, well covers, stairs, fencing for petroleum, universally used in most general industrial plants as well as commercial buildings, it has wide applications as walkways, platforms, safety barriers, drainage covers and ventilation grateschemical, power plant, waste treatment plant, civil engineering projects and environmental projects.
is the most popular of all grating types due to it's strength, cost efficient production and ease of installation.
CONSTRUCTION DRAWING AND SPECIFICATIONS
The buyer shall be expected to furnish to the supplier a set of construction drawings and specifications of current insure showing the layout of supports and floor openings correctly dimensions, together with the size and types of grating and treads desired. Should cutouts for vertical bracing or moment connections be required for shop fabrications, the structural steel detail drawings shall be furnished prior to the preparation of the grating drawings
If construction drawings and specifications are not available, the buyer shall provide complete information regarding all items listed in “to be provided".
