Hot rolled chequered steel plate (also called checkered plate, floor plate, or tread plate) is a specialized carbon steel product with a raised pattern on one surface, designed to provide slip resistance in industrial and commercial applications. For B2B exporters on Alibaba.com, understanding the technical specifications is critical to matching buyer requirements and avoiding costly specification mismatches.
Material Grades: The Foundation of Quality
The most common material grades for hot rolled chequered steel plate include Q235 (Chinese GB standard), A36 (US ASTM standard), SS400 (Japanese JIS standard), and S235JR (European EN standard). Each grade has distinct mechanical properties that affect weldability, formability, and load-bearing capacity. Q235 and A36 are low carbon steels with good weldability, making them ideal for structural applications requiring fabrication. SS400 offers slightly higher tensile strength, while S235JR includes impact resistance requirements for European construction projects [3][4].
Material Grade Comparison for Hot Rolled Chequered Steel Plate
| Grade | Standard | Yield Strength | Tensile Strength | Primary Market | Key Characteristics |
|---|---|---|---|---|---|
| Q235 | Chinese GB/T 700 | 235 MPa | 370-500 MPa | Asia, Middle East | Cost-effective, good weldability |
| A36 | US ASTM A36 | 250 MPa | 400-550 MPa | North America, Global | Excellent weldability, widely certified |
| SS400 | Japanese JIS G3101 | 245 MPa | 400-510 MPa | Asia, Oceania | Higher strength, corrosion resistant |
| S235JR | European EN 10025 | 235 MPa | 360-510 MPa | Europe, Africa | Impact tested, CE marking available |
Thickness Ranges and Tolerance Standards
Thickness is one of the most critical specification parameters that buyers evaluate. According to ASTM A786 standard, hot rolled floor plates are available in thickness ranges from 1/8 inch to 1/2 inch (approximately 3mm to 12mm), with standard sheet sizes of 4x8 feet (1220x2440mm) and larger. The tolerance for thickness is typically ±0.014 inch (±0.35mm), which is a key quality metric that buyers verify through third-party inspection [2][5].
For Southeast Asian exporters, it's important to understand that different applications require different thickness ranges. Stair treads typically use 3-4.5mm thickness, walkways and platforms require 4.5-6mm, while vehicle floors and heavy-duty industrial applications need 6mm or thicker. Misunderstanding these application-specific requirements is a common source of buyer complaints and order disputes [3].
Surface Pattern Types
The raised pattern on chequered steel plate comes in several standard types, each with different slip resistance characteristics and aesthetic appeal. The Diamond pattern is the most common, offering excellent slip resistance for industrial flooring. Five-Bar pattern provides good traction with easier cleaning. Lentil pattern offers moderate slip resistance with a smoother appearance. Hexagonal pattern is less common but used in specialized architectural applications. The pattern height typically ranges from 0.5mm to 2mm depending on manufacturing process and buyer requirements [3][4].
