What is the delivery condition of Q345qC, Q345qD, Q345qE steel plates?

Standard: GB/T 714-2008
Q345qC steel equivalent: A709 Gr.50 steel
Q345q series steel qualities: Q345qC, Q345qD, Q345qE

Q345qC, Q345qD, Q345qE steel plates are structural steel plates for bridges. It is required to have high strength, toughness and to withstand the load and impact of rolling stock, and have good fatigue resistance, certain low temperature toughness and atmospheric corrosion resistance. The steel for tie-welding bridges should also have good welding performance and low notch sensitivity.

Q345qC, Q345qD, Q345qE steel plate delivery status:

a. The bridge steel shall be delivered in any delivery state of hot rolling, normalizing, thermomechanical rolling and quenching and tempering (including online quenching + high temperature tempering), and shall be indicated in the quality certificate.
b. The Q345qC, Q345qD, Q345qE steel plates delivered in the normalized state should be subjected to high temperature tempering treatment (tempering temperature not less than 580℃) when it is cooled in other media with a faster cooling rate than in the air.
c. For bare steel with atmospheric corrosion resistance, delivery should be made in any of the above delivery states except normalizing. When using a cooling method that is faster than the cooling rate in air, tempering should be performed.

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