Patterned aluminium plate, also called tread plate or anti-slip sheet, is produced by hot rolling the pattern directly into the surface of an aluminium coil. The result is a single piece of metal with raised slip-resistant features, no applied coating and no hidden joint. Selecting the right product means choosing both the alloy family, which governs corrosion and strength, and the pattern geometry, which governs grip and load behaviour.
Alloy Families Behind Patterned Sheet
Patterned plate is normally supplied in three alloy groups, and the difference between them is more than price.
| Base Alloy | Key Characteristics | Typical Applications |
|---|---|---|
| 1060 commercial purity | Aluminium content of 99.6 percent or above, low cost, good ductility | Cold storage floors, outer packaging, general anti-slip uses |
| 3003 aluminium-manganese | Better rust resistance than plain aluminium plate, moderate strength, corrosion resistance below the 5000 series | Truck compartments, cold storage floors, normal service environments |
| 5052, 5083 and 5754 aluminium-magnesium | Higher hardness with tensile strength of at least 180 MPa, strong corrosion resistance for very humid conditions | Ship decks, offshore platforms, chemical equipment |
Where the plate will be exposed to salt spray, standing water or chemical splash, the magnesium bearing 5000 series is the normal choice; where the duty is dry and the priority is cost, 1060 and 3003 give adequate service. Patterned sheet is commonly ordered in H112 and H114 tempers under standards such as ASTM B209 or the GB/T 3880 series, which cover aluminium sheet, plate and strip for general engineering use.
Pattern Geometry and Anti-Slip Behaviour
Five-rib pattern: staggered raised bars set at roughly 60 to 80 degrees, giving an anti-slip coefficient above 0.6. It is the standard choice for building platforms, subway car floors and industrial walkways.
Lentil or teardrop pattern: closely arranged lentil shaped protrusions that resist pressure well, widely used for truck cargo box floors, cold storage floors and elevator steps.
Orange peel pattern: a texture resembling citrus skin that is decorative and easy to clean, so it suits appliance shells such as refrigerators and air conditioners, and packaging applications.
Spherical pattern: semi-circular raised domes that improve compression and deformation resistance, used on exhaust heat shielding and external protection for heavy equipment.
Wave and water ripple patterns: decorative textures intended mainly for roof and wall cladding.
Compass pattern: a grip effect close to five-rib material, but used far less often.
Rattan and three-dimensional triangle patterns: supplied for individual decoration requirements rather than for slip resistance.
Selection Reference
| Option | Advantages | Limitations | Best Fit |
|---|---|---|---|
| 5052 aluminium-magnesium plate | Strong corrosion resistance, high load bearing capacity | Higher cost | Shipbuilding and chemical equipment before construction |
| Five-rib pattern | Excellent slip resistance, good value | Weak decorative effect | Industrial transport before civil use |
| Orange peel pattern | Attractive and easy to clean | Average slip resistance | Home appliances and decoration before industry |
| 1060 commercial purity plate | Lowest cost, very good formability | Lower strength, no corrosion upgrade | Dry indoor flooring and packaging |
Thickness, Tolerance and Fabrication
Patterned plate is described by its base thickness, with the pattern height adding to the overall section. Buyers should state whether the tolerance band applies to the base metal or to the overall height, because the two interpretations give different weights per square metre and different bending behaviour.
Bending: the pattern faces outward on walkway and cab floor work so that the grip surface stays intact; tight bend radii can flatten pattern peaks on the inside of the bend.
Welding: 5000 series material welds cleanly and keeps corrosion resistance in the heat affected zone, while 1060 is easier to form but weaker.
Cutting: the raised pattern makes shearing and laser cutting slightly different from flat sheet, and edge burrs must be dressed on flooring work.
Fixing: drilled or punched holes should be located on the flat areas between pattern features to avoid cracked edges.
Ordering and Inspection Details
Alloy and temper, written together with the standard the order references.
Pattern type, base thickness and overall height.
Sheet size, quantity and whether the pattern runs along or across the sheet length.
Mechanical properties and, where relevant, the corrosion test method agreed with the supplier.
Surface condition: no laps, inclusions, scratches or pattern roll marks beyond the agreed limit.
Flatness, squareness and edge quality, with packaging that protects pattern peaks in transit.
Traceability from heat number to delivered sheet.
Frequently Asked Questions
Q: Which alloy should be used for anti-slip aluminium plate outdoors?
5052, 5083 or 5754 aluminium-magnesium plate is preferred outdoors and in wet or chemical environments because of its corrosion resistance and tensile strength of at least 180 MPa.
Q: What is the anti-slip coefficient of five-rib pattern plate?
The staggered five-rib geometry, with rib angles of roughly 60 to 80 degrees, typically delivers an anti-slip coefficient above 0.6.
Q: What is the difference between lentil pattern and five-rib pattern?
Lentil pattern uses closely packed lentil shaped protrusions for pressure resistance on floors and box bottoms, while five-rib pattern uses angled bars for maximum grip on walkways.
Q: Is orange peel plate a slip resistant product?
Its grip performance is average. It is chosen mainly for appearance and easy cleaning on appliance shells and decorative panels rather than for heavy anti-slip duty.
Q: How is patterned plate thickness specified?
By base thickness, with the pattern height added on top. State clearly whether tolerances apply to the base metal or to the overall section so that weight and formability are predictable.
Q: Can patterned aluminium plate be welded and bent?
Yes. 5000 series grades weld and retain good corrosion resistance, and any pattern can be bent, although tight radii will flatten the pattern peaks on the inside of the bend.
