Hot-Dipped Galvanized Heavy Duty Steel Grating for Trench, Drainage Cover, Manhole Cover, Stair Tread, Floor Drain

• Material: Carbon Steel, Q235, ASTM A36, BS4360 43A, or SS304
• Surface Treatment: Hot Dipped Galvanizing, Mill Finishing, Paint
• Load Bearing Bar Section Size: Depth*Thickness: 25*5 mm, 30*5mm...150 mm*12mm
• Load Bearing Bar Pitch: 12.5, 20, 22, 23.85...60mm
• Square Twisted Cross Bar: 6*6, 8*8
• Round Cross Bar Is Available: Dia. 6mm, 8mm, 10mm
• Cross Bar Pitch: 30, 38...50, 76, 100, 101.6
• Transport Package: Seaworthy, Steel Frame, Steel Belt or Customized
• Specification: GB, ASTM, BS, ANSI
• Trademark: Longta
• Origin: China
• HS Code: 7308900000
• Production Capacity: Over 70000 Tons Each Year

Product Description

Product Description

Heavy duty welded gratings are made of carbon steel or stainless steel. The former products are available bare, painted with hot galvanizing. The latter products are available mild finish, electro- polished.

Welded Steel Bar Grating is the most popular of all grating types due to its strength, cost-efficient production and ease of installation. It is the ideal materials for application such as airfields, highways, industrial plants, truck and bus terminals, parking lots and railroad yards. Common uses are flooring, driveways, subway an d tunnel ventilation grilles, curb inlet grates, ramps, docks, etc.

When order steel grating, you should give the welded steel grating types. Heavy duty welded steel W series, heavy duty welded WH series, heavy duty riveted steel R series, heavy duty standard welded grating and so on.

Detailed Photos

 

Product Parameters

NAAMM 531-17

 

• Heavy duty welded grating ranges in size from 1-1/4" × 1/4" bearing bars through 6" × 1/2" (7" bearing bars available by inquiry).
• Standard bearing bar spacings are 15/16", 13/16", 1-3/8", 1-7/8" and 2-3/8" center-to-center. See pages 25 and 27 for standard cross bar design.
• Rectangular cross bars are also available.
• Standard cross bar spacings are 4" or 2" center-to-center.

 

Certifications

 

Packaging & Shipping

Fabricated Steel Bar Gratings:

Bundled with steel belt






Stock Panel Steel Grating:




Container Loading:


 

Installation Instructions

 

Bearing Bars - Load carrying main elements made from steel, aluminum, or stainless steel, extending in the direction of the grating span.

Bearing Bar Centers - The distance center-to-center of the bearing bars.

Carriers - Flats or angles which are welded to the grating panel and nosing of a stair tread and are bolted to a stair stringer to support the tread.

Clear Opening - The distance between faces of bearing bars in rectangular gratings, or between a bent connecting bar and a bearing bar in a riveted grating.

Cross Bars - The connecting bars which extend across the bearing bars, usually perpendicular to them. They may be bent into a corrugated or sinuous pattern and, where they intersect the bearing bars, are welded, forged or mechanically locked to them.

Cross Bar Centers - The distance center-to-center of the cross bars.

Curved Cut - A cutout following a curved pattern.

Cutout - An area of grating removed to clear an obstruction or to permit pipes, ducts, columns, etc. to pass through the grating.

Electro-Forged - A process of combining hydraulic pressure and heat fusion to forge bearing bars and cross bars into a panel grid.

Finish - The coating, commonly paint or galvanizing, which is applied to the grating.
Flush-Top Grating - A type of pressure-locked grating in which the cross bars and bearing bars are in the same plane relative to the top surface of the grating.

The steel grating must be installed with both ends being placed on supporting base like wide flange beam, stringer.






 

Company Profile

Ningbo Jiulong Machinery Manufacturing Co.,Ltd(NJMM)  is one of the leading manufacturers specialized in Producing press-welded steel grating in China. Located in the famous port city-Ningbo, it has convenient traffic and superior location with only 30-minute drive to Ningbo Leshe International Airport and only 25-minute drive to Ningbo Port.

Founded in 1992, covering an area of 2500 square meters and with workshop area of 18000 square meters, NJMM has advanced equipment, full-fledged technology as well as rich manufacturing and management experience in press-welded steel bar grating field nearly 20 years. NJMM is among the few leading manufacturers who have the entire production process from bearing bar to galvanized steel grating. Nowadays, NJMM, in the area of steel grating and related products, owns the largest scale, has the most product varieties, possess the most powerful capability and achieves the largest export volume in China. The annual production capacity of steel grating, stair tread, trench cover, stanchion and scaffold is over 70000 tons, of which more than 4000 tons are for export.
NJM markets its products mainly to the USA, Chile, Peru, UK, Spain, Holland, Australia, New Zealand, Japan, Malaysia, Singapore, Thailand, etc. In domestic, its marketing and service scope has covered all provinces nationwide and widely applied to many renowned projects in China.

NJMM has got the ISO 9001-2000 Quality Management System Certificate in 2001 and owned integral quality control and inspection facilities as well as rich experience to provide high-quality products for customers.

Through more than 20 years' development, NJMM has become the most influential steel grating producer in China. Owning to superior location and as the leading role played in steel grating in China, NJMM sincerely promises to all customers both at home and abroad, "we will try out best to satisfy our customers with the best quality, the most competitive price and the fastest delivery time"

Our Advantages

 

Over the past decades, we remain our position in the highly competitive industry with strengths in:

a.) Product range: metal bar grating (mild steel, SS304,SS316), steel work, railing, stanchion, clip-fastening, etc.

b.) Full industry chain: complete production line covers slitting of steel coil, forge-welding, automatic cutting, manual welding & robot welding, and hot-dip galvanizing. 

c.) Huge annual output: over 70,000 metric tons in 2019, about one half for exporting and another half for domestic market. 

d.) Total quality management: we have been ISO9001-2000 accredited since 2001. We implement total quality management covering each step of production processing to ensure products are exactly made to standards. We've established wide cooperation with many famous international giants like BP p.l.c, BASF, Sinopec and so on.




Contact: Mr. Andrew Young

 
 

Please write to me now if you have any questions or pending inquiry!