The toughness of steel such as EN 10025-6 high strength steel 1.8914 is the ability of steel to absorb energy in the process of plastic deformation and fracture, and also the ability of steel to resist impact load. It is related to and different from the plasticity of steel. It is the comprehensive performance of strength and plasticity. The strength plasticity index of steel is obtained by static tensile test. When these indexes are used to bear the dynamic load structure, there are obvious limitations.
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S420NL-Z35 steel plate is alloy structural steel, and it implements the European standard EN 10025-3. The chemical composition of S420NL-Z35 steel plate: C:≤0.2, Si:≤0.6, Mn: 1 - 1.7, P:≤0.025, S:≤0.02. Delivery state of EN 10025-6 high strength steel 1.8914, S420NL-Z35 steel plate: quenching + tempering. Of course, the delivery status can also be selected according to specific demands. However, it needs to be communicated between the supplier and the demander and indicated in the contract.