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Die steel selection
Nov 29, 2017

Die steel in the selection of roughly meet the working conditions, process performance requirements and economic requirements.

1. Working conditions

(1) Abrasion resistance When the billet plastically deforms in the mold cavity, it flows and slides along the surface of the cavity, causing violent friction between the surface of the mold cavity and the billet, resulting in failure of the mold due to abrasion. Therefore, wear resistance is the most basic mold, one of the most important performance.

Hardness is the main factor affecting wear resistance. Under normal circumstances, the higher the hardness of the mold parts, wear the smaller, better wear resistance. In addition, the wear resistance is also related to the type, amount, shape, size and distribution of carbides in the material.

(2) toughness Under normal circumstances, the working conditions of the mold is very poor, and sometimes will bear a greater impact load, resulting in brittle fracture. To prevent mold parts suddenly brittle fracture at work, the mold to have a higher strength and toughness. Mold toughness depends mainly on the carbon content of the material, grain size and the state of the organization.

(3) Fatigue fracture performance Mold work process, under the long-term effects of cyclic stress, often lead to fatigue fracture. The forms of small-energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture. Die fatigue fracture performance depends on its strength, toughness, hardness and the content of inclusions in the material.

(4) high temperature performance When the working temperature of the mold is high, it will lead to the decrease of hardness and strength of the steel, resulting in early wear or plastic deformation of the mold failure. Therefore, the mold material should have a higher anti-tempering stability, to ensure that the mold at working temperature, with high hardness and strength.

(5) Cold and hot fatigue resistance Some mold in the work process is in the state of repeated heating and cooling, the cavity surface by the tension, pressure, alternating stress effect, causing surface cracking and peeling, increasing friction, hinder Plastic deformation, reducing the dimensional accuracy, resulting in mold failure. Hot and cold fatigue is one of the main forms of hot die failure, such molds should have high resistance to thermal fatigue properties.

(6) Corrosion resistance Some molds such as plastic mold, due to the existence of plastic in the work of chlorine, fluorine and other elements, the decomposition will be precipitated after heating HCl, HF and other aggressive gases, erosion mold cavity surface, increase its surface Roughness, aggravate wear and tear failure.

2 process performance requirements

Mold manufacturing process generally go through forging, cutting, heat treatment and other processes. In order to ensure the manufacturing quality of the mold and reduce the production cost, the mold material should not only have good malleability, machinability, hardenability, hardenability and grindability, but also should be less sensitive to oxidation and decarburization Sexual and quenching deformation cracking tendency.

(1) Malleability has a lower resistance to hot forging deformation, good plasticity, wide forging temperature range, cold forging cracking and low propensity to precipitate network carbides.

(2) annealing process ball annealing temperature range, annealing hardness and low volatility, high rate of nodularity.

(3) Cutting Machinability Large amount of cutting, low tool loss, low surface roughness.

Hubei Kaixin Supply Chain Management Co., Ltd.

TEL :+8618272169977 ; 0714-6510168



Add:No.37 Huahu Ave Huahu Street.Huangshi City Hubei