37Cr4 structural alloy steel is used for mechanical parts and all kinds of engineering components and contains one or several kinds of alloy element in steel,EN 10083-1 37Cr4 steel is widely used in ships, vehicles, aircraft, missiles, weapons, railways, Bridges, pressure vessels and so on.
http://www.bsteelplate.com/Alloy-structural-steels/EN-10083-1/EN-10083-1-37Cr4-steel.html?li
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