Q355B High Strength Low Alloy Hot Rolled Carbon Steel Coil 355MPa Yield 1.5-20mm Thickness 600-2000mm Width

The Q355B high strength low alloy hot rolled carbon steel coil is engineered for structural applications that demand a superior strength-to-weight ratio without compromising weldability. With a guaranteed minimum yield strength of 355 MPa, this HSLA coil delivers reliable load-bearing performance for heavy fabrication while allowing designers to reduce section thickness and overall steel tonnage. Each coil is produced on fully automated continuous rolling lines with advanced laminar cooling control, ensuring uniform mechanical properties across the entire strip length and width. Zhengde supplies Q355B coils in thicknesses from 1.5mm to 20mm and widths from 600mm to 2000mm, with tight dimensional tolerances that simplify downstream cutting, bending and welding operations. The material chemistry is carefully balanced with controlled micro-alloying elements such as niobium and vanadium to refine grain structure, delivering consistent impact toughness even at low service temperatures. Every heat is sampled and tested in our nationally recognized laboratory, and complete mill test certificates are issued with each shipment for full material traceability.

• High Strength Design: Minimum 355 MPa yield strength enables lighter structural sections while maintaining load capacity, reducing total steel cost for fabricators
• Superior Weldability: Controlled carbon equivalent below 0.42 ensures crack-free welding with standard procedures, ideal for site fabrication and workshop assembly
• Uniform Mechanical Properties: Advanced laminar cooling and automatic gauge control deliver consistent hardness and strength from coil start to finish
• Tight Dimensional Tolerance: Thickness deviation within +/- 0.1mm and width tolerance within +20mm/0mm simplify downstream processing
• Excellent Toughness: Fine grain microstructure provides stable impact performance at -20 degrees C, suitable for cold-region structures
• Full Traceability: Each coil carries heat number, mill test certificate and EN 10204 3.1 documentation for quality audits

Q355B coils are widely used in steel structure buildings, bridges, transmission towers, mining equipment, crane booms, ship superstructures, pressure vessels and general machinery frames where high strength and reliable welding performance are required. The grade is a direct substitute for S355JR in projects specified to EN 10025, simplifying international procurement.

Coils are packaged with anti-rust paper, plastic film, metal edge protectors, wooden pallets and steel straps for safe sea transportation. Zhengde operates under ISO 9001:2015 quality management, with SGS and BV third-party inspection available on request. Standard delivery is 7-15 days for stock sizes and 20-30 days for production orders.