High Quality Q235B Open Plate Hot Rolled Paving Plate Medium Thick Plate

1. Superior Mechanical Properties (Q235B Grade Advantage)

• Enhanced strength & ductility: As a low-carbon steel (carbon content: 0.12–0.20%), Q235B offers a minimum yield strength of 235 MPa and tensile strength of 375–500 MPa—sufficient for medium-load structural tasks (e.g., building beams, machine frames). Its elongation rate (≥26%) ensures excellent ductility, allowing bending, punching, or welding without brittle cracking.

• Reliable impact toughness: Unlike basic Q235, Q235B requires a Charpy V-notch impact test at 20°C, with a minimum impact energy of ≥27 J. This makes it suitable for outdoor or temperature-fluctuating environments (e.g., bridge components, outdoor storage racks) where sudden loads or mild low temperatures may occur.

• Uniform grain structure: High-quality hot rolling (heating steel to 1,100–1,250°C, followed by controlled rolling) refines the steel’s grain into a dense, uniform structure. This eliminates internal defects (e.g., voids, segregation) and ensures consistent mechanical performance across the entire plate—critical for structural safety.

2. Precise Dimensional & Surface Quality

• Strict dimensional tolerance: Complies with international standards (GB/T 709 for hot-rolled steel plates, ASTM A36 for global compatibility). For medium-thick plates (6–60mm), thickness tolerance is as tight as ±0.3mm–±1.0mm, width/length tolerance ±2mm, and flatness ≤3mm/m. This ensures easy assembly with other structural parts (e.g., connecting to steel columns) without on-site rework.

• Clean, low-defect surface: High-quality production processes (including post-rolling descaling to remove oxide scale) result in a smooth, matte surface with minimal flaws (e.g., scratches, pits, or cracks). While hot-rolled plates retain a natural industrial finish, the clean surface simplifies subsequent treatments (e.g., painting, galvanizing) to improve corrosion resistance.

3. Excellent Workability for Fabrication

• Superior weldability: Low carbon content and minimal impurities (e.g., sulfur, phosphorus ≤0.045%) reduce the risk of weld porosity or cracking. It is compatible with all common welding methods (MIG, TIG, arc welding) and requires no pre-heating for plates ≤30mm thick—saving time for on-site structural assembly.

• Easy machinability: The hot-rolled microstructure keeps the steel ductile yet rigid, allowing efficient cutting (plasma, flame, or laser cutting), drilling, and milling with standard industrial tools. Even 60mm-thick plates can be precision-machined into custom parts (e.g., thick flanges, heavy-duty brackets) without excessive tool wear.

• Formability for customization: Controlled hot rolling preserves the steel’s plasticity, enabling post-production shaping (e.g., cold bending into curves for architectural elements, rolling into cylindrical shells for low-pressure tanks) while maintaining structural integrity.

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