The tensile strength of ordinary alloy structural steels, especially the qufu tensile strength is much higher than that of ordinary carbon structural steels with the same carbon content, and it has good plasticity, toughness, cold deformation and weldability.

Some ordinary alloy structural steel also has good wear resistance, high temperature resistance, low temperature resistance and atmospheric, seawater, hydrogen sulfide and other corrosion properties, so it is widely used in Bridges, buildings, vehicles, ships, boilers, oil pipelines, power stations, mining equipment, agricultural machinery and other aspects, due to high strength,  Using ordinary alloy structural steel to replace ordinary carbon structural steel can reduce the weight of structural parts by 20%~30% and save steel.

In some cases, the weight of the structural parts under the same load can be reduced by 20%-30% and the steel can be saved by replacing the ordinary carbon matrix structural steel with ordinary alloy structural steel.  Some common alloy structural steels instead of common carbon structural steels can effectively prolong the service life of components or components in atmospheric, seawater, hydrogen sulfide and other corrosive environments or in cold conditions.

High strength should not be excessively emphasized in the selection of ordinary alloy structural steel, including replacing ordinary carbon structural steel, improving strength and reducing weight of structural parts.  If the strength is too high, the toughness and plasticity of steel will be reduced to a certain extent, and the manufacturing of structural parts will be difficult.

In addition, the stiffness of each structural part has a certain requirement, the cross-section is not allowed to be excessively reduced with the increase of strength, in addition, steel must have enough toughness reserve under service conditions, in case of sudden brittle fracture of the structural part.

The use of environment, working conditions are different, the selection of steel should be different, such as in the cold area of the north, to consider the cold brittleness and low temperature impact performance of steel, in the southern hot area to consider the corrosion resistance of steel, especially because of the selection of high strength steel interface size or fire poison thin structural parts, more to prevent corrosion,  To avoid further reduction of interface size or thickness due to corrosion.