Low alloy and high strength steel is a kind of engineering structural steel developed by adding a small amount of Mn, Si and trace amount of Nb, V, Ti, Al and other alloying elements on the basis of carbon structural steel.Low alloy means that the total alloying element in steel does not exceed 3%.High strength is relative to carbon engineered structural steel.The development principle of low alloy and high strength steel is to obtain the highest comprehensive mechanical properties by using as few alloy elements as possible so as to meet the purpose of using and low cost.Low alloy and high strength steel can meet the engineering requirements of various structures (such as large Bridges, pressure vessels and ships, etc.) with large bearing capacity, and at the same time reduce the weight of the structure, improve the reliability and save materials and resources.

This type of steel is mainly used to make all kinds of engineering structures requiring high strength, such as Bridges, ships, vehicles, high pressure vessels, oil and gas pipelines, large steel structures, etc.Because this type of steel does not need complex treatment process, even without heat treatment can obtain higher strength, so that the quality of the engineering structure is greatly reduced, therefore, this type of steel to replace the general carbon structural steel.