Preparation method for improving performance of 4Cr5MoSiV1 hot work die steel
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A high-performance technology for hot-working die steel, applied in heating/cooling equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of low mechanical performance index of materials, affecting the service life of molds with comprehensive performance of materials, and unqualified production process, etc.
Active Publication Date: 2016-04-27
INNER MONGOLIA NORTH HEAVY INDS GROUP
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Domestic similar products are not qualified due to the production process, and the mechanical properties of the material are low. When the general hardness is 45±1HRC, the single notched impact performance KV2≥8J, the average notched impact performance KV2≥15J, the s...
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Embodiment 1
[0024] 1) The molten steel is smelted in an electric furnace, refined in an LF furnace, and subjected to vacuum carbon deoxidation and slag surface full-diffusion deoxidation refining, so that the free oxygen is ≤ 6ppm, and then a mixture of La and Ce with an oxygen content of 60ppm is added. The weight ratio of La and Ce is 3:7, at the same time, rare earth La and Ce account for 0.02% of the total molten steel, realizing the three functions of purifying molten steel, metamorphic inclusions and microalloying, and pouring through atmosphere protection to prevent secondary oxidation of molten steel. ;
[0025] 2) The steel ingot in step 1) is demolded and sent to the forging workshop, heated to 1250-1260°C, and subjected to 25-27 hours of heat preservation, diffusion, and homogenization annealing to reduce the segregation of C, Cr, Mo, and V components in the steel through diffusion. Reduce the level of zonation to lay the foundation for increased strength and isotropy;
[0026...
Embodiment 2
[0034] 1) The molten steel is smelted in an electric furnace, refined in an LF furnace, and subjected to vacuum carbon deoxidation and slag surface full-diffusion deoxidation refining, so that the free oxygen is ≤ 6ppm, and then a mixture of La and Ce with an oxygen content of 50ppm is added. The weight ratio of La and Ce is 3:7, at the same time, rare earth La and Ce account for 0.02% of the total molten steel, realizing the three functions of purifying molten steel, metamorphic inclusions and microalloying, and pouring through atmosphere protection to prevent secondary oxidation of molten steel. ;
[0035] 2) The steel ingot in step 1) is demolded and then hot sent to the forging workshop. After heating to 1260-1280°C, 26-28 hours of heat preservation, diffusion, and homogenization annealing, the segregation of C, Cr, Mo, and V components in the steel can be reduced by diffusion. Reduce the level of zonation to lay the foundation for increased strength and isotropy;
[0036...
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Abstract
The invention relates to 4Cr5MoSiV1 hot work die steel, in particular to a preparation method for improving the performance of the 4Cr5MoSiV1 hot work die steel. The preparation method comprises the steps of producing highly-clean steel ingots with the total oxygen content being 12 ppm by adopting electric furnace smelting, vacuum carbon deoxidizing and slag surface diffusing and deoxidization refining, adding the pure rare earth La and Ce on the oxygen control condition and carrying out argon shield pouring; carrying out diffusing and homogenizing annealing on the steel ingots and upsetting and drawing forging on the steel ingots in the three-dimensional directions three times, fast cooling the steel ingots through water and air alternately after forging, carrying out the processes of fast cooling after ultrahigh-temperature austenitizing and spheroidizing annealing before quenching, carrying out tempering with the temperature not lower than 590 DEG C 2-3 times after quenching, and finally obtaining the stable tempered structure of the 4Cr5MoSiV1 hot work die steel. According to the invention, the single notched impact property KV2 of the 4Cr5MoSiV1 hot work die steel is greater than or equal to 25 J, the average notched impact property KV2 is greater than or equal to 30 J, the single non-notched impact energy is greater than or equal to 280 J, the average non-notched impact energy is greater than or equal to 320 J, the ratio of the transverse non-notched impact energy to the longitudinal non-notched impact energy is greater than or equal to 93%, and the isotropy is excellent.
Description
technical field [0001] The invention relates to a 4Cr5MoSiV1 hot work die steel, in particular to a preparation method for improving the performance of the 4Cr5MoSiV1 hot work die steel. Background technique [0002] Mold is an important basic process equipment in the manufacturing industry. The level of mold technology has become one of the important symbols to measure the level of a country's product manufacturing industry. With the development of China's mold manufacturing industry, the development of mold steel in my country is very rapid. The steel types of mold steel The series has been continuously improved, and the quality level and production process equipment have made great progress. However, for die-casting mold steel, H13 and other similar domestic 4Cr5MoSiV1 are generally used internationally. Due to the special working environment of die-casting molds, molds are required to have excellent high temperature resistance. Tensile strength, excellent high temperature ...
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