Working principle of cold-drawn bearing steel

The working principle of cold-drawn bearing steel mainly includes the cold-drawing process and the changes in steel properties after cold-drawing.

Cold-drawing process
Cold drawing is to stretch the steel bar at room temperature so that the tensile stress it is subjected to exceeds the yield point strength of the steel bar, forcing the steel bar to undergo plastic deformation. This process includes the internal crystallization of the steel bar causing sliding, bending, elongation, rotation, twisting and even destruction, and ultimately achieving the purpose of improving the strength of the steel bar through deformation hardening and aging treatment.

Changes in steel properties after cold drawing
The hardness of the bearing steel increases after cold drawing, but its plasticity, toughness and elastic modulus will decrease. Specifically, cold drawing can significantly increase the strength of the steel, while improving its internal organizational structure, reducing internal defects, and improving the density and uniformity of the steel. This treatment method not only improves the mechanical properties of the steel, but also saves the amount of steel used.