Structural steel for bridges is mainly used to make riveted and bolted welded bridge steel structures such as highway bridges, railway bridges, sea-crossing bridges, overpasses, viaducts, and large mechanical bridge cranes. ASTM A572 gr.50 steel plate, E grade bridge steel is suitable for low temperature and severe cold environment or bridge structural parts that are subjected to dynamic loads and the stress conditions of components are very complex and harsh.
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Another big difference between the two steel plates is the difference in surface conditions. The surface of the ASTM A572 gr.50 steel plate cold-rolled steel sheet is processed very delicately in the form of matt finish rolling (pear skin processing) and bright finish rolling due to the cooperation of cold rolling and quenched and tempered rolling. The surface of the hot-rolled steel sheet used in ordinary processing is in the state of pickling the oxide scale generated during hot rolling, so it is rough and does not have the uniform state of the ASTM A572 gr.50 steel plate cold-rolled steel sheet.
