Welded steel bar grating is a grid product made of mild steel (e.g., Q235, ASTM A36) or stainless steel (304/316L). It is formed by arranging load-bearing flat bars and cross bars vertically at a certain spacing, fixing them via resistance welding or arc welding, and then processing with hot-dip galvanization (or polishing). With firm welding joints and regular structure, it combines load-bearing and protection functions, serving as a common support and drainage product in industrial and municipal fields. Welded steel bar grating is widely used in various load scenarios due to its stable performance.

Core Product Features

Firm Welding & Anti-Deformation

Adopting automatic welding process, the joint welding strength is ≥300MPa. Load-bearing flat bars and cross bars have no loosening, and the structure remains stable even under long-term vibration (e.g., equipment operation platforms) with a deformation rate ≤0.5%.

High Load-Bearing Performance

Uniform load capacity reaches 1.5-50kN/㎡. The 38×5mm flat bar specification can withstand 6 tons/㎡, meeting the needs of pedestrians, forklifts and medium-sized vehicles, and adapting to multi-load level scenarios.

Long-Term Corrosion Resistance & Durability

Hot-dip galvanized layer thickness ≥85μm (complying with ASTM A123 standard), with corrosion resistance over 20 years in salt spray environment; stainless steel versions can resist acid and alkali corrosion, suitable for chemical and coastal scenarios.

Convenient & Efficient Installation

Light weight (about 25-40kg/㎡), equipped with standardized accessories such as pressing plates and bolts. A single person can complete splicing and installation, with installation efficiency 50% higher than traditional cast iron gratings.

Excellent Drainage & Ventilation

Opening rate is 35%-60%, and the passing rate of rainwater and oil is 8-10 times that of solid plates. It can quickly drain surface water, reducing slip hazards and pipe blockage risks.

Typical Application Scenarios

1.Industrial Field：Factory workshop operation platforms, equipment maintenance walkways, bottom layers of storage shelves, withstanding mechanical vibration and cargo pressure, such as assembly line platforms in auto parts factories.
2.Municipal Infrastructure：Urban sidewalks, overpass step plates, rainwater gratings, balancing pedestrian safety and drainage, suitable for municipal road reconstruction projects.
3.Transportation & Logistics：Freight port loading platforms, logistics warehouse ramps, parking lot floors, adapting to high-frequency vehicle rolling and cargo handling needs.
4.Energy Industry：Thermal power plant boiler platforms, wind power base maintenance channels, PV plant inverter protection gratings, withstanding high-temperature or high-humidity environments.
5.Construction Engineering：Basement roof drainage layers, roof maintenance platforms, elevator shaft protective nets. The regular structure of Welded steel bar grating can also be used as decorative gratings for building facades.

Product parameters

Place of Origin	Hebei, China	Brand Name	SND
Surface Treatment	Bitumen/epoxy/OEM	Material	Mild steel
Product name	Mild steel Grate	Process	Sand foundry
Hardness	HBS 170-230	Standard	GB/T 23858 - 2009
Certification	CE ISO9001	Load Class
Quality Control	100% Inspected	Dimensions	As drawings
Shape	Square/Circle/OEM
Customized Service	Drawing design

Packaging and delivery

Package Solution	Wooden pallet/OEM
Loading Port	Tianjin Port/Qingdao Port/OEM
Delivery time	7-15 Day against QTY

Welcome contact us for customized dimensions.

Inspection Items

Material Composition Inspection
Dimensional Accuracy Inspection
HDG thickness Inspection
Surface Quality Inspection

Certifications

SND has fully passed the ISO9001 quality management system certification and CE. During the production process, it implements a number of strict detailed standards and conducts full-process quality control. Our company has well-equipped chemical laboratories and physical performance laboratories. A complete set of testing equipment such as Direct Reading Spectrometer, Metallographic Microscope, Hardness Tester, Universal Material Testing Machine and Pressure test machine can be used to effectively control chemical composition and ensure mechanical performance.

About SND

SND FOUNDRY have been specializing in the production and sales of metal casting products nearly 20 years. It is located in Wu'an Industrial Park, Handan City, Hebei Province. The park is the largest mechanical casting spare parts processing industrial park in Handan, with a complete supporting industry chain and convenient transportation.

The company integrates sand casting, lost foam casting, machining, surface treatment and assembly service one stop. It specializes in providing precision castings of various materials such as cast iron, cast steel, stainless steel, with an annual output 20,000 tons of castings.

FAQ

Q: 1.What is the usual service life of Welded steel bar grating?

A: The galvanized mild steel version can be used for more than 20 years in ordinary outdoor environments, and 15 years in coastal high-salt spray environments (with upgraded thick zinc layer ≥120μm); the stainless steel version (316L) has a service life of more than 30 years in chemical environments.

Q: 2.Which international standards does the product comply with?

A: It complies with ASTM A36 (base material), ASTM A123 (galvanization), EN 10240 (steel grating) and GB/T 13912 (hot-dip galvanization) standards. CE certification is available for export to Europe and America.

Q: 3.Can special-sized or special-shaped gratings be customized?

A: Customization is supported. The minimum order quantity for regular sizes (1m×2m, 1.2m×2.4m) is 50㎡, and 100㎡ for special shapes (fan-shaped, arc-shaped). The customization cycle is 7-15 days, and processing can be done according to drawings.

Q: 4.How to clean and maintain oil stains or debris on the grating surface?

A: Rinse with a high-pressure water gun daily; oil stains can be cleaned with neutral detergents (e.g., detergent) combined with a steel brush, with no sanitary dead corners. Maintenance is recommended once a quarter.

Q: 5.What is the delivery cycle for in-stock gratings of regular specifications?

A: Common specifications (30×3mm, 38×5mm, 1m×2m) are in stock, and goods can be shipped 3-5 days after ordering; non-stock specifications need to be produced according to orders, with a cycle of 7-10 days, supporting logistics methods such as sea freight and air freight.

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