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The general annealing method is to keep the temperature at a low temperature of 1°C or less, while high-speed steel is held for a longer period of time due to the lower temperature and cannot be fully crystallized and softened. With the increase of temperature, steel will be rapidly and completely transformed after high temperature annealing, to achieve the effect of complete recrystallization, so that the steel gets fully softened.
Heat treatment process holding time is greatly reduced. h14 die steel by high temperature annealing, steel hardness is reduced, cutting performance is better, its cutting efficiency increased by 20%, made into tools than ordinary annealed steel cutting life increased by 15% to 20%.
Toughness.
The mold is subjected to impact load during the working process. In order to reduce cr12 mold steel in use fracture, chipping and other damage, mold steel must have a certain toughness.
Its chemical composition, grain size, purity, number, shape, size, distribution of carbides and inclusions, as well as the heat treatment system and the metallurgical organization obtained after heat treatment have a great impact on its toughness. In particular, the purity and hot work deformation of the steel have a more significant effect on the transverse toughness. Steel toughness, strength and wear resistance are often contradictory to each other. Therefore, the chemical composition of the steel should be reasonably selected, using a reasonable refining, heat treatment and heat treatment process, so that the die material wear resistance, strength and toughness to match.
Impact performance refers to the total energy absorbed by the material throughout the fracture process of hot forging die steel during one impact. However, many tools are subject to fatigue fracture under different working conditions, and conventional impact toughness does not fully reflect the fatigue performance of die steel. The test method is to use small energy, multiple stamping work or multiple stamping life and fatigue life test method.
