GB/T 1591 Q345B Steel Plates

High-strength, low-alloy structural steel plate manufactured to the GB/T 1591 standard, grade Q345B. These hot-rolled plates deliver medium tensile strength (nominal yield around 345 MPa) with good weldability, formability and toughness for general structural and heavy-fabrication use.

Key specifications

• Standard: GB/T 1591 (Q345B)
• Production method: Hot-rolled
• Thickness range: 2 – 240 mm
• Width range: 100 – 4,800 mm
• Length range: 100 – 25,000 mm

Typical applications

• Structural steelwork (beams, columns, frames)
• Bridges and civil infrastructure
• Heavy machinery and equipment fabrication
• Truck bodies, trailers and industrial containers
• General engineering and welded structures

Quality and compliance

Supplied to internationally recognised quality standards. The Q345B grade is a low-alloy structural steel designed for reliable mechanical performance in welded and formed components. Specify required dimensions, surface condition and any testing or certification needs when requesting a quote.

How to request a quote

When submitting an RFQ, include required grade (Q345B), thickness/width/length, quantity, delivery terms and any inspection or certification requirements so suppliers can provide competitive, accurate offers.