Rectangular Bar Grating (Carbon Steel) is the industry-standard heavy-duty flooring solution, featuring solid rectangular bearing bars (20–200 mm deep, 3–20 mm thick) from high-tensile steel (Q235B, Q355B, S275JR, ASTM A36). Fabricated via pressure resistance welding for standard panels or manual welding for custom shapes, it uses twisted square or round cross bars in common pitches like 30×100 mm or 40×100 mm. Available in plain or serrated surfaces with hot-dip galvanizing (ASTM A123/ISO 1461), it delivers superior lateral stability, impact resistance, and load capacity for rolling traffic such as forklifts and trucks.
Carbon steel – Rectangular section steel grating
Rectangular Bar Grating (Carbon Steel)
1. Product Information
Rectangular Bar Grating (Carbon Steel) is the primary choice for the vast majority of industrial flooring projects. Utilizing solid rectangular bearing bars, it provides high structural rigidity and exceptional lateral stability. Compared to the I-Bar profile, the solid cross-section offers uniform strength distribution, making it the superior solution for environments subject to heavy impact, high-frequency vibration, or high-capacity rolling loads such as forklifts and trucks.
2. Technical Parameters
| Feature | Standard Specifications | Technical Notes |
| Material Grade | Q235B, Q355B, S275JR, ASTM A36 | High-tensile grades (Q355/S275) for long-span structures |
| Fabrication | Pressure Resistance Welding / Manual Welding | Standard profiles use Pressure Resistance Welding; Custom profiles use Manual Welding |
| Bearing Bar Depth | 20mm up to 200mm | Deep bars (75mm+) are specialized for heavy-duty trench covers |
| Bar Thickness | 3.0mm-20.0mm | Solid rectangular section provides uniform structural mass |
| Bearing Bar Pitch | 30mm, 32.5mm, 40mm, 60mm（or custom） | Industrial standards typically use 30/100 or 40/100 configurations |
| Cross Bar Type | Twisted Square Bar / Round Bar | 6mm or 8mm twisted bar provides bi-directional traction |
| Surface Finish | Hot-Dip Galvanized (ISO 1461 / ASTM A123) | Provides excellent corrosion resistance and long-term durability |
| Surface Texture | Plain / Serrated | Serrations are cut through the bar depth for maximum grip |
Engineering Notes:
1.Yield Strength: Use Q355B for spans >1.5m to prevent permanent set under dynamic vibration.
2.Weld Penetration: Manual welds on banding bars must achieve a minimum 3mm throat thickness to resist lateral tire torque in forklift zones.
3.Field Treatment: All field-cut edges must be treated with 95% Zinc-rich cold galvanizing spray immediately to prevent edge creep corrosion.
3.Product Advantages
1.Superior Lateral Stability: The solid rectangular profile is highly resistant to “tripping” or twisting under side-impact loads.
2.Heavy-Duty Scaling: Bearing bars can be scaled up to 10mm thickness to handle heavy forklift and truck traffic.
3.High Impact Resistance: The solid material mass effectively absorbs energy from falling tools without structural failure.
4.Field Modification Friendly: Rectangular bars are easier to cut, notch, and weld-reinforce at the job site.
4. Core Applications
1.Heavy Industry: Refineries, chemical plants, and steel mills.
2.Infrastructure: Loading docks, bridge sidewalks, and drainage trenches.
3.Mining: High-vibration environments requiring maximum resistance to fatigue.
5. Customization Services
1.Manual Welding Banding: Every panel end is manually banded with flat bars to prevent bar spreading and increase lateral load capacity.
2.Precision Cut-outs: Expert manual tailoring for circular penetrations and notches around structural columns.
3.Toe Board (Kick Plate) Attachment: Manual welding of 100mm+ kick plates to the finished grating as per safety standards (OSHA/EN ISO 14122).
6. Quality Control
1.Pressure Resistance Welding Audit: Continuous monitoring of hydraulic pressure to ensure the cross bar is fully fused and embedded.
2.Dimensional Tolerance Audit: Every panel checked for ±5mm precision using 1:1 layout templates.
Galvanizing Inspection: Verification of zinc coating thickness (ISO 1461) to prevent localized rust in intersections.
7. FAQ
Q: Why choose Rectangular Bar over I-Bar for heavy-duty areas?
A: Rectangular bars have more mass and a solid web, making them significantly more resistant to deformation under heavy rolling loads like forklifts.
Q: How does Q355B material affect the span of the grating?
A: Q355B has a higher yield strength, allowing for a 15-20% longer span or higher load capacity compared to standard Q235B at the same depth.
Q: Is the serrated surface necessary for outdoor walkways?
A: Yes, for outdoor environments exposed to rain, ice, or oil, serrated bars are highly recommended to meet industrial slip-resistance standards.
Q: What is the benefit of Pressure Resistance Welding over manual welding for standard panels?
A: It provides a cleaner, more consistent joint that is fused at the molecular level, offering better resistance to vibration-induced fatigue.
Q: Can you provide custom sizes for irregular platform shapes?
A: Absolutely. We use Precision Manual Welding to cut and band irregular shapes, ensuring they fit perfectly around pipes or structural supports.
Q: How do you prevent the grating from rattling after installation?
A: Our high-pressure fusion process ensures a rattle-free joint, and we recommend using our specialized M-clips or saddle clips for secure fixing.
Q: What is the lead time for Hot-Dip Galvanized rectangular grating?
A: Standard panels are typically ready for shipping within 7-10 days, including the full galvanizing process to ISO 1461 standards.
In summary, Rectangular Bar Grating excels in rigorous heavy-industry settings including refineries, chemical plants, steel mills, mining operations, loading docks, and infrastructure trenches. Its solid profile ensures exceptional fatigue resistance, vibration tolerance, and field modification ease, while corrosion-resistant galvanizing and optional serrations provide long-term safety, durability, and reliable performance under demanding dynamic loads.
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