Traffic sign board aluminum circle plate
When we think about traffic signs, our minds often go straight to bright colors, clear fonts, and reflectivity. Yet, behind the scenes lies a crucial component — the aluminum circle plate that forms the very base of many traffic sign boards. Its material properties, manufacture, and engineering standards determine not only the durability but also the performance and safety of traffic signs worldwide.
Most traffic sign boards start with raw materials cut into specific shapes, such as rectangles or circles. The choice of an aluminum circle plate is particularly significant for signs like the universally recognizable speed limit signs, prohibitory alerts, or mandatories often crafted in round forms.
The Circular Edge: Beyond Aesthetics
- Uniform Stress Distribution: Circular shapes naturally distribute mechanical stress evenly, resisting bending or warping even under harsh weather.
- Safety and Recognition: Rounded edges reduce potential injury risk during installation or accidental human impact.
- Ease of Fabrication and Mounting: The angular-free perimeter allows efficient mounting systems on poles or boards minimizing edge damage.
Material Parameters & Alloy Specifications
Traffic sign aluminum circle plates typically employ alloys that balance artificial work-hardening potential, corrosion resistance, and surface finishing adaptability. The most common alloys used are from the 5000 and 1000 series, particularly:
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| Parameter | Aluminum 5052-H38 (Common Traffic Alloy) |
|---|---|
| Chemical Composition | Al balance, Mg 2.2-2.8%, Cr 0.15-0.35%, Fe ≤0.4%, Si ≤0.25%, Cu ≤0.1%, Mn ≤0.1% |
| Temper | H38 (Stabilized or strain-hardened with 3/4 hard properties) |
| Density | ~2.68 g/cm³ |
| Tensile Strength | 228-260 MPa |
| Yield Strength | 193 MPa |
| Elongation | 6-10% |
| Corrosion Resistance | Excellent resistance to marine and urban atmospheres |
| Surface Finish | Electrolytic polishing, anodizing, or branding with high reflectivity paint |
This specific temper, H38, is often favored for traffic signage sheets as it provides an ideal mixture of hardness - resistant to dents and deformation, while still maintaining moderate flexibility to prevent brittle failures.
Implementation Standards and Regulation Compliance
The manufacturing of traffic sign aluminum circle plates is stringently guided by international and regional standards intended to protect both environmental and human safety:
- ASTM B209: Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate.
- EN 573-3: Aluminium and aluminium alloys — Chemical composition and form of wrought products.
- AASHTO Standard Specifications: Many U.S.-based transportation departments require adherence to specs for plate thickness, hardness, and substrate properties when ordering substrates.
- Reflectivity and Retro-reflective Face-Application Standards: The base plate must be compatible with paint and retro-reflective sheeting to maximize nighttime and weather visibility Absorb any inspection-start specs from relevant Federal or State DOT.
Typical thickness profiles range from 1.5 mm to 3 mm, subject to service longevity goals and wind load pressure factors.
Tempering & Manufacturing Conditions
The aluminum circle plate undergoes various controlled processes during production:
- Casting into homogeneous sheets.
- Cold Rolling: The sheet is rolled into uniform thickness.
- Annealing or strain Hardening: Specific heat treatment results in the favored H38 temper, providing strength without brittleness.
- Cutting: Precision equipment stamps the plate into circles matching regulatory diameters (commonly 600 mm or 750 mm for standard signs).
- Surface Treatment: Includes degreasing, polishing, or anodic oxidation to ensure optimum bonding of pigments or reflective layers.
Chemical and Physical Properties Table for Aluminum 5052-H38 Alloy Circle Plate
| Element | Range (wt%) |
|---|---|
| Aluminum | Balance (≥ 94%) |
| Magnesium | 2.2 – 2.8 |
| Chromium | 0.15 – 0.35 |
| Iron | ≤ 0.4 |
| Silicon | ≤ 0.25 |
| Copper | ≤ 0.10 |
| Manganese | ≤ 0.10 |
| Zinc | ≤ 0.10 |
| Others | < 0.15 each; total <0.35 |
The Final Word: Aluminum Circle Plates — The Backbone of Safety
On the road, the clarity and endurance of a traffic sign determine the split-second decisions of drivers, impacting lives directly. The aluminum circle plate, oft-overlooked, holds together not just metal and paint but also trust in traffic safety infrastructure.
By rigorously selecting premium alloys such as 5052-H38 with the ideal blend of corrosion resistance, strength, and formability, road safety engineers succeed in producing traffic sign boards that withstand weather, UV exposure, vehicle collisions, and time.
Choosing an appropriately specified Traffic Sign Board Aluminum Circle Plate is a matter of foresight — essential background engineering that drives surface longevity, information reliability, and overall road safe environments worldwide.
About Our Aluminum Circles
We specialize in custom aluminum circle plates optimized for traffic signage, manufactured under strict QC and material standards like ASTM B209 with various alloys including 5052-H38 and surface treatments geared to your regulatory compliance.
Contact us for expert consultation tailored to your signage or infrastructure projects and assure long-lasting and dependable traffic indicators built on the silent strength of precision made aluminum circles.
https://www.al-sale.com/a/traffic-sign-board-aluminum-circle-plate.html
