Hot rolled thick Q345qDNH weathering steel plate has good performance and low cost

Hot rolled thick Q345qDNH weathering steel plate has good performance and low cost

The chemical composition and mechanical properties of the hot-rolled thick Q345qDNH weathering steel plate meet the requirements of GB/T 714-2015. C. The content of S. P is low and the crack sensitivity coefficient is small, which is beneficial to improve the weldability of the steel plate. The atmospheric corrosion resistance index is 1>6.0; Excellent impact performance.

The properties in the thickness direction all meet the requirements of the highest standard Z35 in GB/T 5313-2010 "Steel Plates with Properties in the Thickness Direction", and the anti-lamellar tearing performance is good. The maximum hardness of the heat affected zone is less than 350HV10, and the hot workability and welding performance of the Q345qDNH steel plate are excellent.

According to the structural characteristics of the bridge, the steel beams were welded successively in the factory and on the bridge. The surface of the coating-free weathering steel beam adopts the rust layer stabilization treatment method of water spraying, which not only ensures the uniformity and stability of the rust layer in a short period of time, but also realizes the purpose of green, energy saving and environmental protection.

The use of hot-rolled variable-thickness Q345qDNH weathering steel plate eliminates the need for butt joints at the thickened part of the steel plate, and saves about 49.8 yuan in manufacturing costs per ton of rods.