Hot work die steel and preparation method thereof

A hot work die steel and electric furnace smelting technology, which is applied in the field of metal materials, can solve the problems of deterioration of service performance, decreased strength, unsatisfactory life of hot work die, etc. Effect

Active Publication Date: 2021-10-22
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the working environment of the hot work mold is at a high temperature above 600°C, creep softening will inevitably occur (after a long period of use, the matrix metal of the mold material itself will recover and transform, and the carbides will gather and grow, which is different from the state of the initial installation and use. Compared with the decrease of hardness and strength, the service performance gradually deteriorates), so compared with cold work molds and plastic molds, the life of hot work molds is always unsatisfactory

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  • Hot work die steel and preparation method thereof
  • Hot work die steel and preparation method thereof
  • Hot work die steel and preparation method thereof

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preparation example Construction

[0035] The invention provides a method for preparing hot work die steel, comprising:

[0036] Alloy raw materials are smelted in EBT electric furnace, LF smelted, and VD refined to obtain alloy liquid;

[0037] Die-casting the molten alloy to obtain a casting;

[0038] The casting is subjected to electroslag remelting, primary annealing, forging and secondary annealing to obtain hot work die steel.

[0039] In the present invention, during the EBT electric furnace smelting process of the alloy raw materials, it is preferable to control the P and S content in the material during batching to ensure that the decarburization amount ≥ 0.20% during electric furnace smelting, and the oxygen blowing temperature is to ensure sufficient degassing and degassing. inclusions; the mass content of P is preferably controlled at 0.03-0.08%, more preferably 0.04-0.07%, most preferably 0.05-0.06%; the mass content of S is preferably controlled at 0.02-0.1%, more preferably 0.03% ~0.08%, more p...

Embodiment 1

[0128] Prepare hot work die steel as follows:

[0129] The alloy raw materials are smelted in EBT electric furnace, LF refining and VD refining to obtain alloy liquid;

[0130] Die-casting the molten alloy to obtain a casting;

[0131] The casting is subjected to electroslag remelting, primary annealing, forging and secondary annealing to obtain hot work die steel;

[0132] In the EBT electric furnace smelting process of the alloy raw material, the content of P and S in the material is controlled during batching to ensure that the decarburization amount during electric furnace smelting is 0.35%, and the oxygen blowing temperature is to ensure sufficient degassing and inclusion removal; The mass content of P is controlled to be 0.011%, the mass content of S is controlled to be 0.025%, and the oxygen blowing temperature is 1562°C;

[0133] The EBT electric furnace is smelted by an oxidation method, and 800kg of lime is placed on the bottom of the furnace before charging; in th...

Embodiment 2

[0156] Prepare hot work die steel as follows:

[0157] The alloy raw materials are smelted in EBT electric furnace, LF refining and VD refining to obtain alloy liquid;

[0158] Die-casting the molten alloy to obtain a casting;

[0159] The casting is subjected to electroslag remelting, primary annealing, forging and secondary annealing to obtain hot work die steel;

[0160] In the EBT electric furnace smelting process of the alloy raw material, the content of P and S in the material is controlled during batching to ensure that the decarburization amount during electric furnace smelting is 0.3%, and the oxygen blowing temperature is to ensure sufficient degassing and inclusion removal; The mass content of P is controlled to be 0.05%, the mass content of S is controlled to be 0.05%, and the oxygen blowing temperature is 1570°C;

[0161] The EBT electric furnace is smelted by the oxidation method, and the bottom of the furnace is covered with 800kg of lime before charging; the ...

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Abstract

The invention provides a preparation method of hot work die steel. The preparation method comprises the following steps: carrying out EBT electric furnace smelting, LF refining and VD refining on alloy raw materials to obtain alloy liquid; carrying out die casting on the alloy liquid to obtain a casting; and carrying out electroslag remelting, primary annealing, forging and secondary annealing on the casting to obtain the hot work die steel. A PGH13 electrode bar is smelted by adopting an electric furnace, LF, VD and electroslag remelting, and the problems of structure uniformity and structure refinement of die-casting die steel are solved from the key technical angles of steel structure control and heat treatment; and meanwhile, a key process for stable production of the high-end die-casting die steel is provided by combining service performance evaluation and failure behavior research of the die-casting die steel, and finally, the high-end hot work die steel is mature in process, stable in quality, high in percent of pass, few in waste products and stable in yield at a high level. The invention further provides the hot work die steel.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a hot work die steel and a preparation method thereof. Background technique [0002] According to the classification of carbide forming elements, H13 (4Cr5MoSiV1) steel belongs to medium carbon Cr-Mo-V steel, which is widely used in various fields at home and abroad for its high hardenability, hardenability, toughness and thermal fatigue resistance. A hot work tool. H13 steel has good heat strength, hardenability and thermal fatigue resistance, and is widely used in hot forging dies, aluminum alloy die-casting dies and hot extrusion dies. H13 steel is usually used at a temperature below 600°C. During use, impact fracture and thermal fatigue cracks caused by impact loads and repeated heating and cooling are the main causes of early mold failure. Therefore, improving the impact toughness of steel and inhibiting the generation of thermal fatigue cracks can incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C21D8/00C22C33/04
CPCC22C38/02C22C38/04C22C38/22C22C38/24C22C33/04C21D8/005
Inventor 张璨谢珍勇刘迎骥蔡武胡峰荣任金桥唐佳丽屈小科吴欣容王建
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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