High-silicon high-manganese type high-thermal stability hot work die steel and thermal treatment process thereof

Abstract

The invention relates to high-silicon high-manganese type high-thermal stability hot work die steel and a thermal treatment process thereof, and belongs to the technical field of alloy steel manufacturing process. The hot work die steel is characterized in that the ratio of high silicon to high manganese in chemical components is kept to be 1 to 1 and main alloy elements by mass percent comprise 0.25-0.45% of C, 0.8-2.0% of Si, 0.8-2.0% of Mn, 3.5-4.5% of Cr, 0.6-1.2% of Mo, 0.4-0.8% of V, less than 0.02% of P, less than 0.02% of S and Fe for the rest. A preparation process for the hot work die steel comprises the steps as follows: firstly, preparing materials, smelting and casting; secondly, carrying out electroslag remelting; carrying out high temperature homogenization thermal treatment, and carrying out multi-direction forging hot working; thirdly, carrying out superfine thermal treatment and isothermal annealing treatment; and lastly, carrying out quenching and tempering thermal treatment, namely heating to be 980-1100 DEG C for austenitizing, carrying out oil cooling or mist cooling, and tempering for two to three times at a temperature of 540-600 DEG C. The hot work die steel has the advantages of high thermal stability, high flexibility and good thermal fatigue performance.

Description

technical field [0001] The invention relates to a high-silicon, high-manganese, high-thermal-stability hot work die steel and its heat treatment process. The die steel makes full use of the alloying characteristics of silicon and manganese to ensure high silicon and manganese content in the steel, and the two elements With the same content, it can not only reduce the alloy cost (compared to H13 series steel), but also has higher thermal stability, good toughness and thermal fatigue performance than H13 steel, and belongs to the technical field of alloy steel manufacturing technology. Background technique [0002] The alloying elements that play a role in high-temperature thermal strength and thermal stability in hot work die steel are usually Cr, Mo, V and other elements, so some current research work is mainly on the adjustment of these alloying elements. The recent research of the research group found that the addition of a certain amount of manganese can increase the matr...

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Problems solved by technology

This manufacturing process has the following problems: 1) The size of the electroslag ingot is small, and the small ingot size reduces the yield and manufacturing capacity of the product; 2) The original structure of the electroslag ingot has a large number of large particles or massive liquefied carbonization 3) The grain size of the material after forging is coarse, resulting in low impact toughness of the material after quenching and tempering, and the product grade is low, which cannot meet the market demand for high toughness hot work die steel need

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