Q355ND is a kind of low-alloy high-strength steel plate, which is a kind of steel with good comprehensive performance and low-temperature toughness by adding an appropriate amount of alloying elements and controlled rolling and quenching processes. The numerical designation is the grade in China's GB/T1591-2018, which was developed in the early 1980s and occupies a fairly important position in China's structural steel. Q355ND steel plate has good fatigue resistance , low temperature toughness, corrosion resistance and good processability, with good impact toughness and high elastic limit at room temperature.
The chemical composition of Q355ND steel plate should be in accordance with the provisions of GB/T1591-2018, and the main components include carbon (C), silicon (Si), manganese (Mn), phosphorus (P) , sulfur (S) and other elements. The content and proportion of these elements affect the mechanical properties and processing performance of steel sheets. Carbon is one of the main elements of steel, which has a great influence on the strength, hardness, plasticity and toughness of steel. Silicon and manganese are common alloying elements, which can effectively improve the strength and hardness of steel. Phosphorus and sulfur are harmful elements and their content must be reduced to a minimum to ensure the quality and processability of steel.
The mechanical properties of Q355ND steel plate must meet the provisions of GB/T1591-2018, specifically including yield strength, tensile strength, elongation, impact work and other indicators. The yield strength is an important indicator of the toughness of the material, while the tensile strength reflects the ability of the material to resist damage, and the elongation and impact work reflect the plasticity and impact resistance of the material. The specific values of these indicators can evaluate the mechanical properties and safety of use of steel sheets.
