Low-alloy high-strength steel is a kind of engineering structural steel developed by adding a small amount of Mn, Si and trace amounts of Nb, V, Ti, Al and other alloying elements on the basis of carbon structural steel. The so-called low alloy means that the total amount of alloying elements in the steel does not exceed 3%. The high strength is relative to the steel used in carbon engineering structures. The development principle of low-alloy high-strength steel is to use as few alloying elements as possible to obtain the highest possible comprehensive mechanical properties, so as to meet the purpose of use and low cost. Low-alloy high-strength steel can meet the requirements of various structures in engineering (such as large bridges, pressure vessels and ships, etc.), and at the same time require the reduction of structural weight, improve reliability and save materials and resources.
This type of steel is mainly used to manufacture various engineering structures with high strength requirements, such as bridges, ships, vehicles, high-pressure vessels, oil and gas pipelines, large steel structures, etc. Because this kind of steel can obtain higher strength without complex treatment process, or even without heat treatment, the quality of the engineering structure is greatly reduced, therefore, this kind of steel is used to replace the general carbon structural steel.
