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Modified 4Cr5MoSiV1 hot work die steel and preparation method thereof

A modification technology for hot work die steel, which is applied in the direction of metal processing equipment, etc., can solve the problems of hot work dies such as poor service conditions, poor secondary hardening ability, and small heat treatment deformation, so as to increase the yield of rare earths and reduce branches. Effect of crystal segregation and improvement of as-cast structure

Active Publication Date: 2022-02-01
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although its comprehensive performance is very outstanding, its secondary hardening ability in tempering is poor. When the service temperature is higher than 540°C (1000°F), the hardness will drop rapidly, and the deformation of heat treatment is small
[0004] Moreover, with the widespread application of high-speed, high-load, high-precision die forging equipment and high-strength toughness forgings, the service conditions of hot work dies are more severe, and the existing 4Cr5MoSiV1 hot work die steel will also fail due to the above reasons during use , for this reason, the present invention proposes a kind of modified 4Cr5MoSiV1 hot work die steel and its preparation method

Method used

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  • Modified 4Cr5MoSiV1 hot work die steel and preparation method thereof
  • Modified 4Cr5MoSiV1 hot work die steel and preparation method thereof
  • Modified 4Cr5MoSiV1 hot work die steel and preparation method thereof

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Embodiment 1

[0039] This embodiment provides a method for preparing a modified 4Cr5MoSiV1 hot work die steel, comprising the following steps:

[0040] S1, according to the following weight percentages, weigh each preparation raw material respectively:

[0041] C: 0.35%, Si: 1.18%, Mn: 0.46%, Cr: 4.88%, Mo: 1.57%, V: 1.19%, cerium-iron alloy 0.3%, and the balance is Fe.

[0042] S2, first place the weighed Fe, Cr, Mo, V in a vacuum furnace, smelt at 1500°C until melting, then add the weighed Si, C, keep it at 1650°C for 5min, then add the weighed Continue to smelt good rare earth alloys, control the residual amount of rare earth elements in the steel to 0.018%, and control the oxygen content in the steel to 20ppm;

[0043] S3, weigh Al according to 0.1% of the total amount of each preparation raw material, and add it into the vacuum furnace after S2 smelting, control the temperature at 1500 ° C for 5 minutes, and then cast it under the protection of argon to ensure that the oxygen in the s...

Embodiment 2

[0050] This embodiment provides a method for preparing a modified 4Cr5MoSiV1 hot work die steel, comprising the following steps:

[0051] S1, according to the following weight percentages, weigh each preparation raw material respectively:

[0052] C: 0.32%, Si: 0.8%, Mn: 0.2%, Cr: 4.75%, Mo: 1.10%, V: 0.8%, cerium-iron alloy 0.1%, and the balance is Fe.

[0053] S2, first place the weighed Fe, Cr, Mo, V in a vacuum furnace, smelt at 1550°C until melting, then add the weighed Si, C, keep it at 1600°C for 7min, then add the weighed Continue to smelt good rare earth alloys, control the residual amount of rare earth elements in the steel to 0.001%, and control the oxygen content in the steel to 15ppm;

[0054] S3, weigh Al according to 0.05% of the total amount of each preparation raw material, and add it into the vacuum furnace after S2 smelting, control the temperature at 1450 ° C for 3 minutes, and then cast it under the protection of argon to ensure that the oxygen in the ste...

Embodiment 3

[0061] This embodiment provides a method for preparing a modified 4Cr5MoSiV1 hot work die steel, comprising the following steps:

[0062] S1, according to the following weight percentages, weigh each preparation raw material respectively:

[0063] C: 0.45%, Si: 1.2%, Mn: 0.5%, Cr: 5.50%, Mo: 1.75%, V: 1.2%, cerium-iron alloy 0.5%, and the balance is Fe.

[0064] S2, first place the weighed Fe, Cr, Mo, V in a vacuum furnace, smelt at 1600°C until melting, then add the weighed Si, C, keep it at 1700°C for 7min, then add the weighed Continue to smelt good rare earth alloys, control the residual amount of rare earth elements in the steel to 0.02%, and control the oxygen content in the steel to 18ppm;

[0065] S3, weigh Al according to 0.15% of the total amount of each preparation raw material, and add it into the vacuum furnace after S2 smelting, control the temperature at 1550 ° C for 7 minutes, and then cast it under the protection of argon to ensure that the oxygen in the stee...

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Abstract

The invention belongs to the technical field of hot work die steel, and discloses modified 4Cr5MoSiV1 hot work die steel and a preparation method thereof.The preparation method comprises the following steps: putting weighed raw materials into vacuum furnace, smelting to molten state, adding reducing agent, smelting at 1450-1550 DEG C, casting under argon protection, and naturally cooling after casting to obtain steel ingot; remelting the steel ingot by using a protective atmosphere electroslag remelting technology, preserving heat at 1250 DEG C, forging and cooling; and carrying out heat preservation at 850 DEG C, and then carrying out segmented furnace cooling to room temperature, so as to obtain the modified 4Cr5MoSiV1 hot work die steel. By adding the rare earth intermediate alloy and utilizing the interaction of all the components, the yield of rare earth in the steel is increased; segregation of alloy elements such as Cr, Mo and V at the grain boundary is reduced, and the purpose of reducing dendritic segregation is achieved; and the as-cast structure of the steel is improved, and the fatigue life and other mechanical properties of the steel are improved.

Description

technical field [0001] The invention relates to the technical field of hot work die steel, in particular to a modified 4Cr5MoSiV1 hot work die steel and a preparation method thereof. Background technique [0002] At present, in order to avoid failure forms such as fracture, plastic deformation, wear, softening, and fatigue in the process of processing and forming hot-working molds, it is required that the hot-working mold materials have excellent strength, toughness, plasticity, wear resistance, and Temper softening properties. [0003] 4Cr5MoSiV1 hot work die steel (namely H13 steel) has excellent hardenability, good toughness, high wear resistance, good thermal fatigue, etc., so it is often used as hot forging die steel. Although its comprehensive performance is very outstanding, its secondary hardening ability in tempering is poor. When the service temperature is higher than 540°C (1000°F), the hardness drops rapidly, and the deformation of heat treatment is small. [0...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/22C22C38/24B21J5/00
CPCC22C33/06C22C38/02C22C38/04C22C38/22C22C38/24C22C38/005B21J5/002
Inventor 杨礼林赵莉萍徐祺昊秦晨张慧敏
Owner INNER MONGOLIA UNIV OF SCI & TECH
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