Q345QDNH steel plate is delivered in the state of hot rolling, normalizing or thermomechanical rolling. The thickness of Q345QDNH steel plate is not more than 150mm, and the yield ratio is not more than 0.85. Q345QDNH steel plate is mainly used to build railway or highway bridges.
Mechanical properties of Q345QDNH steel plate
1) When the yield strength is not obvious, Rp0.2 can be measured instead of the lower yield strength
2) The tensile test shall be the horizontal test.
3) The impact test is a longitudinal test.
Q345QDNH steel plate heat treatment and delivery status: normalizing, tempering, annealing and quenching, etc.
1) Normalizing: Q345QDNH steel plate is heated to an appropriate temperature for cooling in the air.
2) Tempering: Keep the Q345QDNH steel plate at a suitable temperature for a long time to keep it cool.
3) Annealing: Q345QDNH steel plate is heated to a suitable temperature and slowly cooled according to the heating time of different materials and specifications.
4) Quenching: The Q345QDNH steel plate is heated and kept thick in water, oil or other inorganic salts and other media for rapid cooling.
