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High-heat-strength hot-work die steel and manufacturing method thereof

A technology of hot work die steel and its manufacturing method, which is applied in the fields of alloy steel and its manufacture, high thermal strength hot work die steel and its manufacture, and can solve problems such as restricting the development of the die casting industry and insufficient high temperature performance, so as to improve the heat strength Insufficient, excellent hardenability, good processability and reproducible effect

Inactive Publication Date: 2019-06-07
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the lack of high temperature performance of hot work die steel, especially the commonly used hot work die steel 4Cr5MoSiV1, seriously restricts the development of die casting industry.

Method used

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  • High-heat-strength hot-work die steel and manufacturing method thereof
  • High-heat-strength hot-work die steel and manufacturing method thereof
  • High-heat-strength hot-work die steel and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The steel of this embodiment has the following chemical composition in weight percent: carbon C: 0.44%, silicon Si: 0.30%, manganese Mn: 0.48%, chromium Cr: 4.52%, molybdenum Mo: 2.15%, vanadium V: 0.85%, Cobalt Co: 1.40%, Phosphorus P: 0.009%, Sulfur S: 0.002%, and the balance is iron Fe and unavoidable impurities.

[0049] In this embodiment, the manufacturing process and steps of hot work die steel are as follows:

[0050] Step 1. Electric furnace smelting: smelting in an electric furnace according to the above alloy element ratio, the melting temperature is greater than 1500°C, then vacuum degassing, then casting into electrode rods, and finally electroslag remelting into φ600mm electroslag ingots for future use.

[0051] Step 2. High-temperature diffusion annealing: heating the electroslag ingot to 1257° C. for 20 hours for high-temperature diffusion annealing, uniform structure, and elimination of alloy composition segregation and liquefied carbides.

[0052] Ste...

Embodiment 2

[0058] The steel of this embodiment has the following chemical composition in weight percent: carbon C: 0.41%, silicon Si: 0.10%, manganese Mn: 0.32%, chromium Cr: 4.95%, molybdenum Mo: 2.49%, vanadium V: 0.61%, Cobalt Co: 0.80%, Phosphorus P: 0.010%, Sulfur S: 0.002%, and the balance is iron Fe and unavoidable impurities.

[0059] The manufacturing method of steel is the same as embodiment 1.

Embodiment 3

[0061] The steel of this embodiment has the following chemical composition in weight percent: carbon C: 0.42%, silicon Si: 0.20%, manganese Mn: 0.40%, chromium Cr: 4.85%, molybdenum Mo: 2.25%, vanadium V: 0.63%, Cobalt Co: 0.92%, phosphorus P: 0.010%, sulfur S: 0.002%, and the balance is iron Fe and unavoidable impurities.

[0062] The manufacturing method of steel is the same as embodiment 1.

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Abstract

The invention relates to a high-heat-strength hot-work die steel. The high-heat-strength hot-work die steel comprises the following alloy elements of, in percentage by mass, 0.40-0.45% of C, 0.10-0.30% of Si, 0.30-0.50% of Mn, 4.50-5.00% of Cr, 2.10-2.50% of Mo, 0.60-0.90% of V, 0.80-1.50% of Co, less than or equal to 0.015% of P, less than or equal to 0.002% of S, and the balance Fe and inevitable impurities. The invention also provides a preparation and heat treatment method of a cobalt alloying hot-work die steel, the method comprises the following steps of burdening, smelting, casting andelectroslag remelting; high-temperature diffusion annealing and multi-direction forging hot working are carried out; preparation heat treatment is carried out; and final heat treatment is carried out.According to the steel prepared by the preparation method, the defect that 4Cr5MoSiV1 steel carbide is prone to coarsening and growing under the high-temperature condition is overcome, the solid solution strengthening effect of the cobalt element is utilized and the proportion of the components is reasonably adjusted, a proper preparation method is combined, so that the high-temperature strength,the tempering-resistant softening performance, the heat-resistant fatigue resistance and the heat-melt-loss resistance of the material are greatly improved, and the requirement for the high-temperature comprehensive performance of the material for the manufacturing of the current hot-work die is met.

Description

technical field [0001] The invention relates to an alloy steel and a manufacturing method thereof, in particular to a high thermal strength hot work die steel and a manufacturing method thereof, belonging to the technical field of alloy steel manufacturing technology. Background technique [0002] Hot work die steel is an alloy tool steel mainly used to make molds for thermal deformation processing of metals. The working environment temperature of hot work dies is relatively high. Wear and corrosion caused by repeated tensile and compressive stresses and metal (liquid) flow, common failure forms are: thermal fatigue, fracture, plastic deformation, thermal wear and thermal melting loss, etc. Therefore, mold materials are required to have high strength, hardness and thermal stability, especially high thermal strength, thermal fatigue, toughness and wear resistance. [0003] At present, the commonly used hot work die steel in China is mainly 4Cr5MoSiV1 (H13). The advantage of ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/30C21D1/26C21D3/00C21D8/00C22B9/18C22C33/04
Inventor 吴博雅吴晓春
Owner SHANGHAI UNIV
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