It has moderate strength. High plasticity during cold deformation, good low temperature performance, weldability and machinability are acceptable. Compared with the corresponding carbon steel content, its hardenability is higher, in the oil critical quenching diameter of 4 ~ 15 mm, but heat treatment has overheating, decarbonization sensitivity and tempering brittleness tendency.

This kind of steel, due to the suitable hardenability, after the appropriate metal heat treatment, the microstructure is uniform soxlet, bainite or very fine pearlite, and thus has a high tensile strength.

Used to make the surface and core of the requirements are not high, section size diameter. 50mm carburized parts, such as cars, tractors and machine tools instead of 20Cr steel carburized pinion, small shaft, low requirements of piston pin, cross pin, diesel sleeve, valve head rod, transmission lever, steel sleeve, etc. In addition, the steel can also be used in the hot rolling and normalizing state for the manufacture of riveting welders, screws, nuts, etc.

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