Q460 is a high-strength low-alloy steel. Q460's designation method: its steel number is prefixed with "Q", which represents the yield point of the steel, that is, the yield strength. The following number indicates that the yield point value 460 represents 460 megapascals, mega is the 6th power of 10, and Pa is the pressure unit Pascal. Q460 means that the plastic deformation of steel will only occur when the strength of the steel reaches 460 MPa, that is, when the external force is released, the steel can only maintain the shape of the force and cannot return to its original shape. This strength is greater than that of ordinary steel. The general quality grade symbols are A, B, C, D, E, respectively. On the basis of ensuring low carbon equivalent, Q460 appropriately increases the content of microalloying elements. Good welding performance requires a low carbon equivalent of steel, and the increase of microalloying elements increases the strength of the steel while also increasing the carbon equivalent of the steel. But fortunately, the added carbon equivalent is very small, so it will not affect the welding performance of the steel.
