Economical hot die-casting die steel and preparation method thereof

Abstract

The invention discloses economical hot die-casting die steel. The economical hot die-casting die steel comprises the following chemical components of, in percentage by weight, 0.25-0.45% of C, 1.0-5.0% of Si, less than or equal to 1.0% of Mn, less than or equal to 2.0% of Cr, less than or equal to 1.5% of Mo, less than or equal to 0.035% of P, less than or equal to 0.035% of S, less than or equalto 0.035% of AL, and the balance Fe and other inevitable impurities. When the hot die-casting die steel is produced, slag charge is added, wherein the slag charge comprises 5% or less of MnO2, 5% or less of Ti02, 5% or less of boric acid, 2% or less of industrial soda ash, 5%-15% of Na2O or K2O, 65%-70% of SiO2, 15%-30% of AL2O3, 10% or less of CaF2 and 10% or less of CaO. The invention further discloses a preparation method of the hot die-casting die steel, and on the basis that the die steel has the advantages of being high in strength, resistant to creep deformation, good in fracture toughness, stable in structure performance and the like, the production and manufacturing cost of the hot die-casting die steel is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel preparation, and in particular relates to an economical hot die casting die steel and a preparation method thereof. Background technique [0002] Die steel can usually be divided into three categories: hot work die steel, cold work die steel and plastic die steel. Hot work die steel is mainly used to manufacture aluminum alloy die-casting dies and copper-zinc die-casting dies. It is one of the most widely used and consumed die steels. Even if the liquid metal is in contact with each other, when the hot metal is put into the cavity of the hot work mold, the surface of the cavity will heat up sharply, and the surface layer will generate compressive stress and strain. The effect of tensile strain is very easy to cause thermal fatigue, and the hot work die steel is also subjected to a large impact load during its service. For this reason, the material for making the mold needs to have high th...

AI Technical Summary

Problems solved by technology

The advantages of 3Cr2W8V are high thermal strength, high tempering resistance, high thermal stability, good wear resistance and processing performance, the working temperature can reach 650 ° C, and medium hardenability; the disadvantage is serious carbide segregation, plasticity, toughness, Poor thermal conductivity, thermal fatigue resistance and erosion resistance

The advantage of 4Cr5MoSiV1 is that it has high thermal strength and hardness, good toughness, thermal fatigue performance and certain wear resistance under medium temperature conditions, and high hardenability, small heat treatment deformation, and the disadvantage is that the use temperature is lower than 600 ℃ , when the temperature is too high, the hardness decreases, and the crack resistance of the steel decreases significantly, which becomes the main cause of mold failure

The tool steel described in this US patent document contains not only Ni element, but also high content of Cr, Mo, and W elements, and the cost is relatively high

[0007] Aiming at the weakness of the above-mentioned existing technology with high cost, we have prepared hot die casting die steel that meets the performance requirements while greatly reducing the production cost through reasonable material design and process preparation.

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