Steel Grating
Introduction
Steel grating is a fabricated metal product consisting of bearing bars and cross bars, assembled by electro forging , manual welding, pressure-locking, or riveting. It is widely used in industrial flooring, walkways, platforms, stair treads, drainage covers, and safety barriers due to its high load-bearing capacity, durability, and slip resistance.
Types of Steel Grating
Welded Steel Grating
- Construction: Bearing bars and cross bars are resistance-welded at intersections.
- Features: High strength, economical, uniform appearance.
- Applications: Industrial floors, platforms, catwalks, heavy-duty areas.
Press-Locked (Pressure-Locked) Grating
- Construction: Cross bars are pressed into pre-notched bearing bars.
- Features: Smooth surface, precise tolerances, aesthetic look.
- Applications: Architectural uses, façades, stair treads, commercial buildings.
Riveted Steel Grating
- Construction: Bearing bars are riveted to bent connecting bars.
- Features: Excellent fatigue resistance, suitable for dynamic loads.
- Applications: Bridges, highways, areas with vibration.
Serrated Steel Grating
- Construction: Bearing bars are rough top with anti skid features.
- Features: Excellent fatigue resistance, suitable for dynamic loads.
- Applications: Oil Industry, Lubrication Industry.
Materials of Construction
Mild Steel (Carbon Steel)
- Grade: IS 2062, ASTM A36, equivalent.
- Properties: High strength, economical, easy fabrication.
- Surface Finish: Black, painted, hot-dip galvanized.
Galvanized Steel
- Process: Hot-dip galvanizing as per IS 2629 / ASTM A123.
- Properties: Excellent corrosion resistance, long service life.
- Applications: Outdoor platforms, coastal and chemical environments.
Stainless Steel
- Grades: SS 304, SS 316.
- Properties: Superior corrosion resistance, hygienic, high durability.
- Applications: Food processing, pharmaceutical, marine and corrosive areas.
Common Grating Specifications
- Bearing Bar Size: 25×3 mm, 30×5 mm, 40×5 mm, 50×5 mm
- Bearing Bar Spacing: 30 mm, 35 mm , 40 mm
- Cross Bar Spacing: 50 mm, 75 mm, 100 mm
- Panel Size: As per customer requirement
Strength / Load Capacity Chart (Typical)
Note: Values are indicative and may vary with manufacturer standards and design codes.
Bearing Bar Size (mm) | Bearing Bar Spacing (mm) | Clear Span (mm) | Safe Uniform Load (kN/m²) | Approx. Weight (kg/m²) |
25 × 3 | 30 | 600 | 3.5 | 32 |
25 × 5 | 30 | 800 | 5.0 | 42 |
30 × 5 | 30 | 1000 | 7.5 | 48 |
40 × 5 | 30 | 1200 | 10.0 | 60 |
50 × 5 | 30 | 1500 | 12.5 | 72 |
40 × 5 | 40 | 1000 | 6.0 | 50 |
50 × 5 | 40 | 1200 | 8.5 | 62 |
Advantages of Steel Grating
- High load-bearing strength
- Excellent drainage and ventilation
- Anti-slip surface options available
- Low maintenance
- Long service life
Typical Applications
- Industrial flooring and platforms
- Walkways and catwalks
- Stair treads and ladders
- Trench and drain covers
- Power plants, refineries, warehouses