Press-Locked Welded Steel Gratings are grid products made of mild steel (e.g., Q235, ASTM A36). They are manufactured by mechanically pressing load-bearing flat bars and cross bars to form a tight interlock, followed by integral welding reinforcement and hot-dip galvanization. The combination of press-locked structure and welding process endows them with both tight connection and high strength, while the zinc layer forms a long-term anti-corrosion barrier, suitable for load-bearing and protection needs in various scenarios.

Core Product Features

Stable & Anti-Loose Structure

Dual fixation of press-locked interlock and double-sided welding enhances the connection strength between cross bars and flat bars by 40% compared to simple welding, no loosening under long-term vibration and impact, suitable for equipment operation platforms.

High Load-Bearing Capacity

Uniform load capacity reaches 2-60kN/㎡. The 40×5mm flat bar specification can withstand 8 tons/㎡, meeting the needs of heavy forklifts and medium-sized vehicles.

Long-Term Corrosion Resistance

Hot-dip galvanized layer thickness ≥85μm (complying with ASTM A123 standard), corrosion resistance over 25 years in salt spray environment. Metallurgical bonding between coating and steel prevents peeling.

Flat & Aesthetic Appearance

Press-locked process ensures surface flatness error ≤2mm/m, no welding protrusions, directly applicable to landscape walkways, commercial areas and other scenarios requiring good appearance.

Efficient Drainage & Ventilation

30%-65% opening rate enables 10x higher passing efficiency of rainwater and oil than solid plates, quickly eliminating surface water accumulation hazards.

Typical Application Scenarios

1.Industrial Workshops：Mechanical workshop operating platforms, equipment maintenance walkways, bottom layers of storage shelves, withstanding equipment vibration and cargo pressure.
2.Municipal Landscapes：Urban square pavement, park walkways, water feature covers, combining load-bearing, drainage and aesthetics.
3.Transportation & Logistics：Freight port loading platforms, logistics warehouse ramps, parking lot floors, adapting to high-frequency vehicle rolling.
4.Energy Facilities：Thermal power plant boiler platforms, wind power base maintenance walkways, substation ground gratings, suitable for high-temperature and high-humidity environments.
5.Construction Engineering：Basement roof drainage layers, roof platform gratings, elevator shaft protective nets. The stability of Press-Locked Welded Steel Gratings ensures long-term safe use.

The difference with DI gully grate

Comparison Dimension	Hot-Dip Galvanized Steel Gully Gratings	Ductile Iron Gully Gratings
Material & Process	Carbon steel + hot-dip galvanizing	Ductile iron + painting/dipping
Corrosion Resistance	Zinc layer isolates air and moisture, long-term corrosion resistance, acid and alkali resistance	Coating is easy to fall off; cast iron is prone to rust after falling off, requiring regular maintenance
Weight & Installation	Light weight (approximately 35kg/㎡), manageable and installable by a single person	Heavy weight (approximately 85kg/㎡), requires mechanical assistance for installation
Load-Bearing Capacity	Medium-to-high strength (2-60kN/㎡), suitable for medium-to-heavy loads	Ultra-high strength (≥70kN/㎡), suitable for heavy-duty trucks and construction machinery
Corrosion Resistance & Maintenance	Long-term protection by galvanized layer, maintenance cycle of 6-10 years, easy to repair if damaged	Coating is prone to aging and peeling, requires annual repainting, high repair cost after rusting
Appearance & Customization	Flat surface, supports irregular cutting (fan-shaped, arc-shaped) with a lead time of 7-15 days	Rough surface, single style, requires mold opening for customization with a lead time of over 30 days and 50% higher cost
Economics	Low raw material cost, total life-cycle cost 35% lower than that of ductile iron products	High raw material cost, high casting energy consumption, overall high comprehensive cost
Applicable Scenarios	Medium-to-heavy load scenarios such as industrial platforms, municipal landscapes, and logistics warehouses	Extra-heavy load scenarios such as highways, heavy-duty docks, and mines

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.Will the connection of Press-Locked Welded Steel Gratings loosen due to temperature changes?

A: No. It adopts a design matching the thermal expansion coefficient of Q235 and cross bars, combined with welding reinforcement. The connection stability remains unchanged within the temperature range of -30℃ to 200℃.

Q: 2.How to confirm the suitable flat bar specification?

A: Choose 30×3mm (2kN/㎡) for pedestrian areas, 40×5mm (20kN/㎡) for forklift areas, 50×8mm (60kN/㎡) for vehicle areas. Third-party load test reports are available.

Q: 3.Which international standards does the product comply with?

A: It complies with ASTM A36 (material), ASTM A123 (galvanization), EN 10240 (steel gratings) and GB/T 13912 (hot-dip galvanization) standards.

Q: 4.Can it be used in clean scenarios like food processing workshops?

A: Yes. Optional stainless steel (304/316L) + polishing treatment. The press-locked structure has no sanitary dead corners, meeting food-grade cleanliness requirements.

Q: 5.What advantages does it have over simple welded steel gratings?

A: The core is the dual fixation of press-locking and welding, which increases the connection strength by 40%. Moreover, the surface is flatter, avoiding the weld protrusion problem of simple welding.

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