Main Application Areas of ALLOY STRUCTURAL STEEL

ALLOY STRUCTURAL STEEL refers to steel used for mechanical parts and various engineering components, which contains one or more alloy elements in a certain amount.

Role of Alloy Elements
Improving Hardenability: Alloy elements such as Mn, Mo, Cr, Ni, and Si can improve the hardenability of steel, enabling it to obtain a deeper martensite layer during quenching, thereby enhancing its mechanical properties.
Influencing the Tempering Process: Alloy elements can hinder the diffusion of various atoms in steel during tempering, delaying the decomposition of martensite and the aggregation and growth of carbides, thus improving the tempering stability of steel.
Strengthening and Toughening: Ni strengthens ferrite through solid solution strengthening; carbide-forming elements such as Mo, V, and Nb increase the yield strength of steel through both dispersion hardening and solid solution strengthening; carbon has the most significant strengthening effect. Additionally, the addition of these alloy elements can refine austenitic grains, increasing grain boundary strengthening. Ni also improves the toughness of steel; Mn tends to coarsen austenitic grains and is sensitive to temper brittleness; reducing the content of P and S and increasing the purity of steel play an important role in improving steel toughness.

Main Application Areas
Railways and Bridges: Due to its high strength and good toughness, alloy structural steel is widely used in railway tracks, bridge structures, and other situations requiring heavy loads and complex stresses.
Construction Engineering: In various construction projects, alloy structural steel is commonly used to manufacture metal components that bear static loads, such as steel beams and steel columns.
Machinery Manufacturing: It is used to manufacture various mechanical parts, such as shafts, connecting rods, gears, etc., which need to bear large loads and stresses.
Vehicles and Ships: In vehicle and ship manufacturing, alloy structural steel is used to manufacture key components such as body structures and hull structures.

In summary, alloy structural steel plays a significant role in industrial production due to its excellent performance and wide range of applications.