High-temperature-resistant and high-toughness high-end hot work die steel and production process thereof

Abstract

The invention relates to the technical field of die steel, in particular to high-temperature-resistant and high-toughness high-end hot work die steel and a production process thereof. The hot work die steel comprises the following components of, by weight, 0.32%-0.40% of C; 0.17%-0.27% of Si; 0.40%-0.60% of Mn; 4.90%-5.15% of Cr; 2.85%-3.25% of Mo; 0.52%-0.67% of V; 0.20%-0.40% of Ni; 0.30%-0.50% of Co; less than 0.01% of P; less than 0.001% of S; less than or equal to 0.10% of Cu; less than or equal to 1.5 ppm of [H]; less than or equal to 15 ppm of [O]; less than or equal to 75 ppm of [N]; and the balance Fe. According to the high-temperature-resistant and high-toughness high-end hot work die steel and the production process thereof, the raw material proportion of the hot work die steel is optimized, in the steps of electric furnace smelting, refining, vacuum degassing and secondary vacuum degassing, the content of C, Mn, Cr, Si, V, Mo, Ni and other elements is limited within an accurate regulation and control range, grains are refined through the element Co, the overheating tendency of the steel can be reduced, and the durability and red hardness of the steel can be improved; and compared with conventional hot work series die steel, the high temperature resistance is improved, and the high-temperature strength and toughness are high.

Description

technical field [0001] The invention relates to the technical field of die steel, in particular to a high-end hot work die steel with high temperature resistance and high toughness and a production process thereof. Background technique [0002] Hot work die steel mainly refers to the alloy tool steel used in the mold for thermal deformation processing of metals, such as hot forging dies, hot extrusion dies, die-casting dies, hot heading dies, etc. Since the hot work mold works under high temperature and high pressure conditions for a long time, the mold material is required to have high strength, hardness and thermal stability, especially high thermal strength, thermal fatigue, toughness and other properties. Mold processing has a series of advantages such as high production efficiency, good quality, material saving and low cost. It has a wide range of applications. Hot work die steel refers to the alloy steel used in molds suitable for thermal deformation processing of magn...

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Problems solved by technology

[0003] H13 steel works below 600°C, has good thermal stability and thermal fatigue resistance, and has a good combination of strength and toughness, but above 600°C, the strength and thermal stability of the material drop sharply, and the original excellent performance is lost.

However, H21 steel with high heat resistance has poor thermal fatigue resistance under high temperature conditions, and molds often fail due to cracks, which greatly reduces the service life of molds and increases production costs.

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