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Austenitic hot-work die steel and preparation method thereof

A technology of hot work die steel and austenite, which is applied in the field of hot work die steel and its preparation, can solve the problem that the service temperature should not exceed 650°C, and achieve the effect of improving the thermal strength performance

Inactive Publication Date: 2013-01-16
BAOSTEEL SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The high-strength hot work die steel material involved in the above-mentioned patent with the publication number US2010193089 is a high-carbon high-tungsten-molybdenum type high-strength hot work die steel, which increases the precipitation of carbide types by increasing the carbon content and the chromium and tungsten-molybdenum content Strengthening to achieve high-temperature strength and hardness of the reinforced material, but in essence, this material is also a martensitic high-heat-strength hot-work die steel, so its highest service temperature should not exceed 650°C

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  • Austenitic hot-work die steel and preparation method thereof
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  • Austenitic hot-work die steel and preparation method thereof

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Embodiment Construction

[0046] Adopt the following steps to prepare austenitic hot work die steel: (Table 2 has listed the chemical element mass percentage ratio in each embodiment, and Table 3 has listed the specific process parameters in each embodiment):

[0047] (1) The raw materials are melted in an induction furnace and then cast into steel ingots;

[0048] (2) Place the steel ingot as a consumable electrode in the electroslag remelting device for electroslag remelting. The liquid metal falls through the slag layer of the slag pool to the water-cooled crystallizer below, and then re-solidifies into 1.0-1.5t steel ingot;

[0049] (3) heating the above-mentioned steel ingot in the heating furnace of the radial forging machine from 500°C to 600°C (into the furnace temperature) at a heating rate of 80°C / h to 100°C / h to 1210 to 1250°C and then keeping it warm for 2 to 4 hours;

[0050] (4) Forging in a radial forging machine: the initial forging temperature is 1080-1130°C, and the final forging tem...

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Abstract

The invention discloses an austenitic hot-work die steel, which comprises the following chemical elements by mass percent: 0.63-0.70% of C, 1.20-1.40% of Si, 12.5-15.0% of Mn, 6.5-7.0% of Cr, 1.0-3.0% of Mo, 1.0-2.0% of V, and the balance Fe and other inevitable impurities. Correspondingly, the invention also discloses a preparation method of the austenitic hot-work die steel. Compared with traditional martensitic hot-work die steel, the austenitic hot-work die steel provided in the invention has very good high hot strength.

Description

technical field [0001] The invention relates to a steel grade and a preparation method thereof, in particular to a hot work die steel under a high-temperature service working state and a preparation method thereof. Background technique [0002] Hot work die steel is used to manufacture die steel for forming metal or liquid metal heated above the recrystallization temperature. This type of mold is mainly used to manufacture hammer forging dies, press forging dies, hot extrusion dies and die-casting dies. In the work, it is not only affected by large impact loads, but also subjected to rapid cooling, rapid heating or high temperature, so that the mold's Complicated and deteriorating working conditions. When the mold is in contact with hot metal during operation, the surface of the mold cavity will be heated to 300-400°C (hot forging die), 500-800°C (hot extrusion die). Therefore, hot work die steel should have sufficient high temperature strength and hardness. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C21D8/00
Inventor 续维王庆亮吴晓春江浩
Owner BAOSTEEL SPECIAL STEEL CO LTD