Standards Applied to Steel Grating Specification
Released time:7/18/2012 Click:
Steel grating consists of a series of bearing bears and cross bars welded together to form a lattice, or mesh. It comes in various specifications, with regard to the material used in its construction, the spacing, or pitch, of its bars and other characteristics. It is typically used to cover drains or pipe outlets or to support floors and elevated walkways.
There are various standards that apply to the specification of steel grating in North America. In the following paragraphs I will show the most common ones to you.
The most common material type is steel. It is typically constructed from mild carbon steel or stainless steel. Mild carbon steel provides added strength for grating in commercial and industrial applications, while stainless steel grating -- typically type 304 or 306 -- provides corrosion resistance.
The steel in the bearings bars should conform to ASTM International, which was formerly American Society for Testing and Materials, standard A1011 Hot Rolled Carbon Steel Sheet and Strip. It should be cut, fitted and welded in accordance with National Association of Architectural Metal Manufacturers (NAAMM) tolerances and welding standards.
* Surface Treatment
Surface treatment can also be called finishing. The steel grating is typical finished by painting or galvanizing (coating with zinc).
Some steel grating is shipped untreated so it can be finished by the recipient, or may be finished by a process known as hot dip galvanizing by the manufacturer.
* Bearing Bars
The bearing bars -- the bars that bear the weight or load -- are typically made from rolled, sheet or slit steel or steel extruded so its cross-section resembles a letter I (I-bar). The surface of the steel may be serrated to provide a safe surface to walk on.
Typically, the load bearing bars should be rectangular and of sufficient depth and thickness to support the expected load. According to one Canadian specification, steel gratings should be capable of supporting a load of nearly 16 tons over a surface area of 85 square inches.
Pitch is the distance between centers of the bearing bars, which varies according to the application. A pitch of 1 3/16 inch is common in industrial applications, but pitches ranging from 15/16 inch to 1/2 inch may also be used at the discretion of the architect or engineer.
The terms above are mentioned most frequently when it comes to the specifications of steel grating. Hope this article may help you.
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