It is well known that stainless steel screws now require moulds for stainless steel screws during the cold heading molding process.

In the process of producing stainless steel fasteners, the die bears the impact load.

In order to reduce the damage in the form of breaking and cutting edge in the process of use, the die steel is required to have a certain toughness.

The chemical composition of die steel, grain size, purity, the number, morphology, size and distribution of carbides and inclusions, as well as the heat treatment system of die steel and the metallographic structure obtained after heat treatment and other factors have a great impact on the toughness of steel.

In particular, the purity and hot deformation of steel have more obvious influence on its transverse toughness. The toughness, strength, and wear resistance of steel are often contradictory.

So speculate

To choose the chemical composition of the steel reasonably and adopt reasonable refining, hot working and heat treatment technology, in order to make the wear resistance, strength and toughness of the die material to achieve a better match.

Impact toughness refers to the total energy absorbed by the specimen during the whole fracture process of a characteristic material during an impact process.

However, many tools are fatigued under different working conditions. Therefore, conventional impact toughness cannot fully reflect the fracture property of die steel.

Testing techniques such as low energy multiple impact fracture work or multiple fracture life and fatigue life are being used.