When the thickness t or diameter d of steel is not more than 16mm, the standard value of yield strength fy=345MPa. Tensile, compressive and bending strength design f=305MPa. Design value of shear strength fv= 175MPa.

Q345 is a low-alloy high-strength steel with good comprehensive properties, good low-temperature properties, good cold stamping properties, good weldability and machinability. Widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment and so on.