Products Description

Press-locked steel bar gratings belong to grid-type components fabricated from mild steel grades such as Q235 and ASTM A36. Production relies on mechanically forcing bearing flats and cross rods into firm interlocking engagement, before full fusion welding reinforcement and subsequent hot-dip galvanizing treatment. This hybrid construction of mechanical interlock plus welded joints delivers robust connection integrity and outstanding structural strength. Meanwhile, the galvanized zinc coating acts as a durable corrosion-resistant shield, making these gratings viable for load-bearing and safeguarding applications across diverse operating environments.

Core Product Features

Stable & Anti-Loose Structure

The dual securing mechanism of press-lock interlock plus double-sided welding raises the joint strength between cross bars and flat bars by 40% over basic welding. It resists loosening amid sustained vibration and impact, ideal for equipment working platforms.

High Load-Bearing Capacity

Uniformly distributed bearing capacity spans 2–60 kN per square meter. The 40×5mm bearing flat bar variant delivers a load threshold of 8 tonnes per square meter, accommodating heavy-duty forklift traffic and medium-weight vehicular loads.

Long-Term Corrosion Resistance

The hot-dip galvanized coating attains a minimum thickness of 85μm, conforming to ASTM A123 specifications. It sustains corrosion resistance exceeding 25 years under salt-laden atmospheric conditions. Metallurgical fusion between the zinc coating and steel substrate eliminates the risk of delamination.

Flat & Aesthetic Appearance

Efficient Drainage & Ventilation

An open area ratio ranging from 30% to 65% delivers a tenfold improvement in rainwater and oil flow throughput compared with solid steel panels. This property rapidly mitigates risks stemming from pooled surface liquids.

Typical Application Scenarios

Industrial Premises: Machine shop operating decks, equipment service access aisles, and storage rack understructures, engineered to endure mechanical vibration and static/dynamic loads from stored goods.

Municipal Landscaping: Paving for urban plazas, park pedestrian routes, and decorative water feature covers, integrating structural load capacity, free drainage, and visual harmony.

Transport & Logistics Zones: Loading decks at cargo terminals, sloped access ramps in distribution depots, and parking deck surfacing, built to withstand repeated rolling loads from heavy vehicular traffic.

Energy Infrastructure: Boiler access platforms for thermal power stations, maintenance gangways at wind farm foundations, and substation floor grating, formulated for sustained operation within hot and humid ambient conditions.

Building Works: Drainage substrate for basement ceilings, rooftop platform grating, and protective screening for elevator shafts. Press‑locked steel bar gratings deliver robust structural stability for dependable long‑term service.

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

Raw Material Constituent Verification

Geometric Tolerance Audit

Hot-Dip Galvanized Coating Thickness Assessment

Surface Finish Integrity Examination

Certifications

SND holds valid ISO9001 quality management system accreditation as well as CE certification. Stringent granular specifications are enforced throughout manufacturing, supported by end-to-end quality oversight. Our facility houses fully furnished chemical and physical performance laboratories. A comprehensive suite of analytical apparatus - including direct-reading spectrometers, metallographic microscopes, hardness testers, universal material testers and pressure testing rigs - enables precise regulation of material chemical makeup and guarantees consistent mechanical properties.

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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