High-silicon high-manganese hot-work die steel and preparation method thereof

Abstract

The invention discloses a high-silicon high-manganese hot-work die steel, comprising the chemical elements in percentage by mass: 0.3-0.4% of C, 1.2-1.8% of Si, 0.6-1.5% of Mn, 3.5-4.5% of Cr, 0.8-1.0% of Mo, 0.3-0.5% of V, less than or equal to 0.03% of P, less than or equal to 0.03% of S, and the balance of Fe and other inevitable impurities. Correspondingly, the invention also discloses a preparation method of the high-silicon high-manganese hot-work die steel. The high-silicon high-manganese hot-work die steel not only has high tempering resistance and good impact toughness, but also can become a low-cost economic type hot-work die steel due to reduction of the content of noble alloy elements such as chromium, molybdenum and the like.

Description

technical field [0001] The invention relates to a hot work die steel and a preparation method thereof, in particular to a hot work die steel with high silicon content and manganese content 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. Therefore, the mold material needs to have high th...

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Problems solved by technology

The chemical composition of this hot extrusion die steel contains relatively high molybdenum, chromium and a certain amount of carbon, so the segregation of the electroslag ingot is serious, and there are a large number of large liquid carbides in the finished structure. , making the toughness of the material insufficient, prone to early crack failure

And because this material contains a large amount of secondary hardening elements, its tempered secondary carbides are easy to grow and coarsen and undergo type transformation under service conditions, and the alloying elements in the tempered martensite are also easy to precipitate and reduce The strength of steel, thereby reducing the high temperature performance of steel

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