A new type of rare earth hot work die steel and its preparation method
A technology of hot-working die steel and rare earth, which is applied in the field of material processing, can solve the problems of high cost and complicated production process, and achieve the effect of good elongation and shrinkage, and excellent comprehensive performance
Active Publication Date: 2020-09-29
ANGANG STEEL CO LTD
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Problems solved by technology
The hot work die steel of the above invention has good thermal strength and high toughness, but the production process is complicated and the cost is high
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[0033] Below by embodiment the present invention will be further described.
[0034] In the embodiment of the present invention, electric furnace smelting, continuous casting, heating, hot rolling and heat treatment are carried out according to the component ratio of the technical solution.
[0035] Reheating: The molten steel is cast into a billet; the heating temperature of the billet is 1230-1330°C, and the soaking time is controlled at 2-4 hours.
[0036] Hot rolling and cooling: Control the starting rolling temperature at 1180-1240°C, and control the finishing rolling temperature at 850-940°C. After rolling, enter ACC cooling, the cooling rate is controlled at 5-10°C / s, the final cooling temperature is 450-540°C, and the temperature is the surface temperature of the steel plate.
[0037] Heat treatment process: isothermal spheroidizing annealing + quenching and tempering process;
[0038] The isothermal spheroidizing annealing process: the first-stage isothermal anneali...
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Abstract
The invention provides a novel rare earth hot-working die steel and a preparation method thereof. A steel plate is prepared from the following compositions in percentage by weight: 0.46%-0.54% of C, 1.20%-1.60% of Si, 0.60%-1.10% of Mn, 3.50%-4.50% of Cr, 1.60%-2.50% of Mo, 1.50%-2.50% of V, less than or equal to 0.015% of P, less than or equal to 0.03% of S, 0.067%-0.086% of Nd, 0.056%-0.072% ofEr, less than or equal to 3.0ppm of [H], less than or equal to 30ppm of [O] and the balance of Fe and unavoidable impurities. The preparation method comprises the steps of electric-furnace smelting, continuous casting, heating, hot rolling, cooling and thermal processing. The hot-working die steel produced by adopting the preparation method of the novel rare earth hot-working die steel has superior mechanical properties and good elongation percentage and concentration percentage synchronously, and has superior comprehensive properties.
Description
technical field [0001] The invention belongs to the field of material processing, and in particular relates to a novel rare earth hot work die steel and a preparation method thereof. Background technique [0002] With the increasing promotion of die-casting and extrusion molding production technology, the mold industry has developed rapidly, and the level of mold manufacturing has become one of the important symbols to measure the development level of a country's processing and manufacturing industry. With the rapid development of the domestic mold industry, the sales of finished molds have increased at an average annual rate of more than 20%. However, my country's mold steel material production enterprises are mixed with good and bad, and the quality is high or low. Some high-end mold materials need to be imported from Japan, Sweden and other countries. Hot work die steel is the main type of die steel used in high temperature and high pressure service environment of hot ex...
Claims
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IPC IPC(8): C22C38/22C22C38/24C22C38/04C22C38/02C22C33/04C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/005C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 冯丹竹赵坦范刘群李云石峰涛高立超刘浩岩李文斌李广龙金耀辉
Owner ANGANG STEEL CO LTD