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Press-weld gratings
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Press-welded gratings

Press-welded gratings

Press-weld gratings

Steel bar grating is the workhorse of the industrial flooring market and has served industry for decades. Strong and durable with an exceptional strength-to-weight ratio, steel bar grating can be easily fabricated to nearly any constructions. The high percentage of open area makes steel bar grating practically maintenance-free, and all products are fully recyclable.


VALLEGE Gratings can supply a wide range of steel bar grating products that can be used for a variety of applications. Steel bar grating is an ideal choice for projects ranging from trench covers and stair treads to decking and steel flooring. Used as metal grates, steel bar grating covers open areas in flooring that require light, liquid, air, heat, and sound to pass between flooring levels.


As a large specialty steel bar grating supplier in China, VALLEGE Gratings has the steel bar grating to fulfill your floor grating or surface needs. Steel bar grating is available in materials such as various types of steel grating. VALLEGE Gratings carries a full steel bar grating product line to meet the needs of the customers.

Sign of steel bar grating

Sign of steel bar grating


Bearing bar pitches may be 20, 22, 30, 32.5, 34.3, 40, 60mm, of which 30mm and 40mm are recommended. 


Cross bar pitch may be 38, 50, 60 to 100mm, of which 50mm and  100mm are recommended. 


Sign of the shape of bearing bars:

F: Plain style (may be omitted in the symbol of steel grating);

S: Serrated style;

II-shape style 


Sign of surface treatment. G-Hot Dip Galvanized (may be omitted in the symbol of steel grating); P - Painted; U – untreated


Type of grating:

W: Press-welded

L: press-locked


Common Steel Bar Grating Applications

  • Industrial platform
  • Bridge Flooring
  • Trench Covers
  • Walkways
  • Ramps
  • Platforms
  • Catwalks

Manufactured Standard

CHN:YT/B 4001.1-2019

UK: BS 4592-1:2006


AUS:  AS1657-2018


Carbon Steel Standard


UK: BS 4460


AUS:  AS3679



  • Materials:Carbon steel,stainless steel 304 or 316.
  • Top surface:Flat surface or Serrated
  • Cut face of Bearing Bar:rectangle and ‘I’ type
Press-weld gratings
Press-weld gratings
Press-weld gratings
Press-weld gratings

Load Tables and Charts

Press-welded gratings Finishes

Steel Bar grating is a functional product that has been in the market for decades helping the industry in several ways, such as industrial flooring, catwalks, antiskid flooring in humid plants, among many other uses. Its contemporary look is nowadays attracting architects to use it as an architectural alternative as fence, facade, louver, and other ornamental elements that complement a residential or urban project.


Due to its diversity in uses, architects and engineers required new and better finishes to assure that grating lasts in specific environments and projects conditions.

Most common steel bar grating finishes are:

Mill Finish

Mill Finish


The panel or custom fabricated grating is delivered in its natural finish, having nothing protecting it. This finish is used when a project requires a natural steel color look, in consideration that its aspect is going to become corroded in few days (appearing oxidation in the piece).

Black Paint Finish

Black Paint Finish


It is about immersing the grating into a black paint kettle adding on a thick layer of special black paint (bituminous paint). This layer protects steel from corrosion for a long period of time. This finish is not the most protective one, but still ensures that the piece does not corrode in the short term.

Powder Coating

Powder Coating


This covering application takes place spraying atomized paint particles to steel generating a more efficient paint. This finish is superior to any other in the market. It offers a wide variety of colors, that´s why architects determine to use it in order to match colors in their architectural projects.


Is recommended to hot dip galvanize the piece before powder coating it since this finishing process guarantees extending grating´s life from 5 to 10 more years.

Hot Dip Galvanizing (HDG)

Hot Dip Galvanizing (HDG)


Is the best corrosion protection available in the market application. The finishing process is performed under ASTM / A123  specifications. It is used for all type of projects due to its resistance to extreme conditions. Besides extending up to 60 years the life of the product, presents a modern grey finish color that transmits elegance.


Hot Dip Galvanizing Standard: 

CHN: GB/T 13912                              

USA: ASTM / A123                              

UK: BS729

AUS: AS1650

Passivated or Electro-polished ( Stainless Steel only )

Passivated or Electro-polished ( Stainless Steel only )

Thanks to this brief explanation of possible steel bar grating finishes, you can now suggest your project manager the best alternative to guarantee durability and aesthetic to the project you’re working on.


If you still have any questions, don’t hesitate and contact us.


All grating must be firmly secured in place.

This is typically accomplished by welding or the use of bolted mechanical fasteners.

There are many fixing methods for steel bar grating. Welding, saddle clips and welding lugs fixing are most frequently used.

Welded Installation


Welding will provide a superior, permanent installation, while mechanical fasteners are available when the grating needs to be removable or welding is not practical.


The recommended minimum weld pattern to the right also indicates the minimum welding space for pedestrian applications.


As permanent facilities, welding method shall be applied. The length of welding seam is no less 20mm, which the height of fillet weld is no less 3mm.


Vehicular applications typically require additional welding, size and spacing determined by the specifying authority.

Welded Installation

Saddle clip


Bent clips bridging two bearing bars are available in galvanized steel, stainless steel. Standard bolt holes are 10mm. Bolts and screws, or other connecting hardware shall be supplied by others.

Saddle clip
Saddle clip
Saddle clip

Weld Lugs


Lugs, punched with holes and welded between the bearing bars, connect bolting to the supporting structure.

Weld Lugs

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Add:No.161 Dongze Road, Fushan District, Yantai, Shandong, China

Mobil Phone:+0086-13905350690


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