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Help CenterSteel Sheet & Plate & Checkered Plate , ASTM A36, S235JR, SS400, A572 Gr50, S355JR
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1. Product Overview
Checkered plate (also known as anti-slip steel plate, lenticular steel plate) is hot rolled carbon steel and low-alloy structural steel plate. This specification only covers carbon steel and low-alloy high-strength steel checkered plates, excluding stainless steel checkered plates and galvanized checkered plates. Regular raised patterned grains are integrally hot-rolled on the plate surface, featuring anti-slip, wear resistance, high load-bearing capacity and stable structural performance. It has excellent machinability, weldability, cutting and bending performance. It is a general basic steel material widely used for industrial platforms, walkways, stair treads, equipment base plates and factory anti-slip floors.
2. Applicable Production Standards
Major applicable national, ASTM, European and Japanese standards are as follows:
Chinese National Standard (GB): GB/T 3277-2015 Checkered Steel Plate (Core mandatory national standard for domestic checkered plates)
ASTM Standard: ASTM A36, A572 series standards for hot rolled anti-slip checkered steel plates
European Standard (EN): EN 10025 General standard for structural steel anti-slip checkered plates
Japanese Standard (JIS): JIS G3101 SS400 Hot rolled patterned structural steel plate
3. Main Grades and Classification
Classified by base material and pattern type, no stainless steel anti-corrosion grades are included:
3.1 Carbon Steel Structural Checkered Plate (General Light-Duty Grade)
GB Grades: Q235B (Mainstream commercial grade with high cost performance)
International Grades: ASTM A36, S235JR, SS400
Application Scenarios: Light-duty pedestrian platforms, stair treads, indoor factory walkways, small equipment base plates, factory trench cover plates
3.2 Low-Alloy High-Strength Checkered Plate (Heavy-Duty Compression Resistant Grade)
GB Grades: Q355B (Former Q345B) high-strength load-bearing checkered plate
International Grades: A572 Gr50, S355JR
Application Scenarios: Heavy-duty vehicle passages, port loading and unloading platforms, heavy machinery equipment base plates, outdoor heavy-duty ramps, operating platforms around pressure vessels
3.3 Classification by Pattern Shape (Full Size In Stock)
Lenticular Pattern (Most Widely Used): Single row lenticular protrusions, moderate anti-slip performance, light dead weight and high cost performance, the dominant grade in the market
Round Bean Pattern: Dot-shaped raised grains with uniform stress distribution, outstanding wear and collision resistance, suitable for high-frequency rolling working conditions
Diamond Pattern: Closed diamond grains with the highest anti-slip level and friction coefficient, the preferred option for humid and oil-polluted working environments
4. Core Physical, Chemical and Mechanical Properties
4.1 Chemical Composition Characteristics
Harmful impurities including sulfur and phosphorus are strictly controlled; Carbon steel grades feature low carbon content for easy welding; Low-alloy grades are added with manganese and silicon trace elements to enhance overall structural strength; No chromium or nickel stainless steel alloy components contained; The base plate and patterned grains have completely consistent chemical composition with uniform overall structure and no internal delamination.
4.2 Key Mechanical Parameters (Standard Nominal Values)
Q235B Checkered Plate: Yield Strength ≥ 235MPa, Tensile Strength: 370-500MPa, Elongation ≥ 26%, applicable to light-duty static load bearing
Q355B Checkered Plate: Yield Strength ≥ 355MPa, Tensile Strength: 470-630MPa, excellent impact and compression resistance, suitable for heavy-duty dynamic load conditions
Anti-slip Performance: Surface friction coefficient ≥ 0.45, stable excellent anti-slip effect under humid working conditions
4.3 Process Characteristics
Superior comprehensive machinability: Compatible with flame cutting, plasma blanking, bending, rolling and welding fixation; Moderate surface hardness with low deformation risk; Patterns and steel substrate are integrally hot-rolled with high wear resistance and no grain falling off; Good atmospheric aging resistance with stable performance under conventional indoor and outdoor environments.
5. Product Specification Parameters
Full-size hot rolled checkered plates in stock and customized processing; The marked thickness refers to base plate thickness (excluding pattern protrusion height):
Base Plate Thickness: 2.0mm—12mm; Customized heavy-duty thick plate: 14mm-20mm
Width: Standard width: 1000mm, 1260mm, 1500mm, 1800mm, 2000mm
Length: 6000mm—12000mm; Custom fixed-length leveling and special-shaped cutting available
Delivery Form: Hot rolled coil plate, leveled full-size plate, special-shaped cutting parts, finished stair treads, prefabricated platform components
6. Delivery Status
Hot Rolled Black Surface (Standard Stock): Original hot rolled delivery without surface treatment; the first choice for general engineering projects with optimal cost
Sandblasted Finished: Oxide scale and floating rust removed with neat appearance, applicable to projects with high surface appearance requirements
Custom Pre-treatment: Primer anti-corrosion spraying available on demand (Excluding galvanizing and stainless steel anti-corrosion treatment)
7. NDT and Quality Grade
General industrial checkered plates only undergo routine visual inspection; Ultrasonic delamination testing is available for heavy-duty structural plates on demand. Qualified plates have no surface cracks, bubbles, scabs, delamination or incomplete patterns; Dimensional tolerance and pattern height comply with GB/T 3275 first-class national tolerance standard.
8. Main Application Fields
This series of carbon steel and low-alloy checkered plates are not applicable to strong acid, strong alkali and high corrosive working conditions. Main application scenarios:
Construction Engineering: Factory stair treads, steel structure platform walkways, high-altitude operation protective platforms, ground anti-slip cover plates
Heavy Industry Equipment: Mechanical equipment operation consoles, equipment base gaskets, crane walkways, heavy-duty ramps
Chemical and Pressure Vessel Supporting: Operating platforms around storage tanks, maintenance walkways for pressure vessel equipment, anti-slip treads in boiler areas
Transportation and Logistics: Cargo truck floor panels, port terminal anti-slip platforms, loading and unloading ramps
Municipal and Factory Facilities: Trench cover plates, sewage plant walkways, factory anti-slip floors, plant maintenance passages
9. Deep Processing Services
Full-process deep processing support: CNC cutting, laser blanking, bending forming, welding fabrication, beveling, sand blasting and rust removal; Custom finished stair treads and welded frame components; Non-standard special-shaped anti-slip parts fabricated according to drawings.
10. Quality Inspection and Warranty Terms
Original factory material certificate, melting analysis report and mechanical property test report provided with goods;
Third-party authoritative re-inspection on chemical composition, mechanical properties and dimensional tolerance is supported;
Integrally hot-rolled patterns feature no falling off or edge chipping; No internal delamination defects inside steel plates;
All dimensional indexes meet national acceptance standards, available for direct site admission and special equipment project filing.
11. Storage and Handling Precautions
1. Carbon steel is susceptible to oxidation and rusting; Store in dry and ventilated environment, avoid long-term outdoor exposure and water accumulation; Anti-corrosion spraying treatment is recommended for outdoor application;
2. Stack plates with patterned surface facing upward to prevent extrusion deformation and collision damage of raised grains;
3. Store Q235B and Q355B steel plates separately; Mixing and alternative usage are strictly prohibited for heavy-duty working conditions.
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