How to select between Q245R steel plate and Q345R steel The notch sensitivity of Q345R steel plate is larger than that of Q245R steel plate, and the fatigue strength of Q345R steel plate is low. Therefore, in some cases, we should pay attention to the influence of medium on Q245R steel plate and Q345R steel plates. For example, Q245R steel plate has better resistance to wet H2S stress corrosion than Q345R steel plate because of its lower carbon equivalent.
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