Components of steel for steel structures

Carbon structural steel is improved by adding an appropriate amount of carbon to pure iron with low strength and good plasticity, and the carbon content of commonly used low fatigue steel does not exceed 0.25%. Low alloy structural steel is on the basis of carbon structural steel, the appropriate addition of a total of no more than 5% of other alloying elements to improve the performance of steel.

Low-alloy structural steel is a steel that adds a small amount of manganese, silicon, vanadium, niobium, titanium, aluminum, chromium, town, copper, nitrogen, rare earth and other elements to low-child steel, and its organizational structure is similar to carbon steel. Alloying elements and their compounds are dissolved in ferrite and pearlite, forming a new solid solution-an alloying ferrite and a new alloying cementite composed of pearlite mesh-like interlayer, so that the strength of the steel is improved, but the plasticity, toughness and weldability are not reduced.