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Optimization method and processing step of high-end hot work die steel

A technology of hot work die steel and optimization method, applied in the field of mechanical parts forming, can solve the problems of inconsistent mechanical properties of the die in all directions, die failure, etc., to achieve excellent thermal crack resistance, improved service life, good thermal strength and toughness Effect

Inactive Publication Date: 2018-07-10
浙江嵊州元丰模具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After thermal processing and annealing, carbon-poor areas and carbon-rich areas are alternately distributed to form a banded structure, resulting in inconsistent mechanical properties of the die, which will cause premature failure of the die

Method used

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  • Optimization method and processing step of high-end hot work die steel
  • Optimization method and processing step of high-end hot work die steel
  • Optimization method and processing step of high-end hot work die steel

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Experimental program
Comparison scheme
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Embodiment 1

[0029] Taking YFH-17 steel as an example,

[0030] 1. For the chemical composition formula (weight ratio) of trace elements of YFH-17 mold steel, see the table below.

[0031] chemical composition

C

Si

mn

P

S

Cr

Mo

V

H13 steel national standard

0.32～0.45

0.80～1.20

0.20～0.50

≤0.030

≤0.030

4.75～5.50

1.10～1.75

0.80～1.20

YFH-17 steel

0.35～0.40

0.30～0.60

0.30～0.60

≤0.015

≤0.005

4.70～5.30

2.20～2.80

0.40～0.70

[0032] It can be seen from the above table:

[0033] The molybdenum (MO) content of YFH-17 steel breaks through the H13 standard upper limit of 1.75, and is greatly increased to more than 2.20, which can refine the grain of the steel, improve hardenability and thermal strength, and maintain sufficient strength and creep resistance at high temperatures Variable capacity (long-term work at high temperature, the gradual deformation that occurs, called creep).

[0034] At the s...

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Abstract

The invention provides an optimization method and a processing step of high-end hot work die steel. On the basis of national standard die steel H13, an optimized raw material formula, an optimized melting process and an optimized heat treatment process are adopted, and the high stability of the H13 is combined, so that heat fatigue resistance and tempering resistance are further improved, better hot strength and toughness are realized, and the service life of a die is remarkably improved. The optimization method and the processing step of the high-end hot work die steel have the following characteristics and advantages of (1) high purity and prolonged fatigue life of the die; (2) high isotropy and excellent shock cracking resistance; (3) excellent toughness and excellent wear resistance; (4) excellent hardenability and dimension stability during high-temperature heat treatment; and (5) excellent hot flush corrosion resistance and excellent hot fracturing resistance.

Description

technical field [0001] The invention relates to the technical field of forming mechanical parts, in particular to an optimization method and process steps of a high-end hot work die steel. Background technique [0002] With the rapid development of the mold industry, more and more parts are formed by die-casting, hot extrusion and hot forging. At present, the hot work die steel widely used in my country is mainly the national standard H13 (4Cr5MoSiV1), which has good toughness and thermal fatigue properties. The demand for aluminum die-casting molds and hot forging molds for components is growing exponentially, and more than 100 million sets of such molds are opened every year. [0003] The service conditions of aluminum alloy die-casting molds and hot forging molds are relatively harsh. The temperature of the aluminum alloy melt is usually around 650-700°C, and the temperature of hot forged products is around 1000°C. The mold must be in contact with high-temperature metal d...

Claims

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Application Information

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IPC IPC(8): C22C38/22C22C38/24C22C38/02C22C38/04C22C33/04C21D8/00
CPCC21D8/005C22C33/04C22C38/005C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 范国勇
Owner 浙江嵊州元丰模具有限公司
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