Which industries are suitable?
Construction: Factories, stadiums, high-rise steel structures
Bridges: Highway/railway bridges (Q345q series)
Machinery: Crane beams, cranes, mining machinery
Energy: Pressure vessels, boilers, oil tanks
Transportation: Vehicles, ships, containers.
What are the differences between bridge-specific Q345q and other types?
Complies with GB/T 714-2015 (bridge-specific standard). Stricter requirements for impact, Z-axis, and fatigue resistance.
Common types: Q345qC/D/E.
Q345R for pressure vessels?
R = Pressure vessel specific, complies with GB/T 713. Optimized composition (C: 0.15–0.20%), better toughness and weldability.
Used for boiler drums, storage tanks, and reactors.
How is the corrosion resistance?
Generally, requires anti-corrosion treatment (painting/galvanizing). Adding Cu and Cr can improve weather resistance (weathering steel). 25. What about its high-temperature performance?
Long-term use: ≤450℃
Strength decreases significantly at 500℃, requiring heat-resistant steel (such as 15CrMo).