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A kind of modified 4cr5mosiv1 hot work die steel and preparation method thereof

A hot work die steel, modification technology, 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, small heat treatment deformation, etc., to increase the yield of rare earth, reduce branch Effect of crystal segregation and improvement of as-cast structure

Active Publication Date: 2022-07-15
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of modified 4cr5mosiv1 hot work die steel and preparation method thereof
  • A kind of modified 4cr5mosiv1 hot work die steel and preparation method thereof
  • A kind of modified 4cr5mosiv1 hot work die steel and preparation method thereof

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Effect test

Embodiment 1

[0039] The present embodiment provides a preparation method of modified 4Cr5MoSiV1 hot work die steel, comprising the following steps:

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

[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, firstly place the weighed Fe, Cr, Mo, and V in a vacuum furnace, smelt at 1500°C to melt, then add the weighed Si, C, keep at 1650°C for 5 minutes, and then add the weighed Good rare earth alloys continue to be smelted, control the residual 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 to the vacuum furnace after S2 smelting, control the temperature to be 1500 ° C for smelting 5min, and then cast it under argon protection to ensure that the...

Embodiment 2

[0050] The present embodiment provides a preparation method of modified 4Cr5MoSiV1 hot work die steel, comprising the following steps:

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

[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, and V in a vacuum furnace, smelt at 1550°C to melt, then add the weighed Si, C, keep at 1600°C for 7min, and then add the weighed Good rare earth alloys continue to be smelted, control the residual 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, add it to the vacuum furnace after S2 smelting, control the temperature to be 1450 ° C for smelting 3min, and then cast it under argon protection to ensure that the oxygen in th...

Embodiment 3

[0061] The present embodiment provides a preparation method of modified 4Cr5MoSiV1 hot work die steel, comprising the following steps:

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

[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 a temperature of 1600 ℃ to melt, then add the weighed Si, C, keep at 1700 ℃ for 7min, and then add the weighed Good rare earth alloys continue to be smelted, control the residual content 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 to the vacuum furnace after S2 smelting, control the temperature to be 1550 ° C for smelting 7min, and then cast it under argon protection to e...

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Abstract

The invention belongs to the technical field of hot work die steel, and discloses a modified 4Cr5MoSiV1 hot work die steel and a preparation method thereof. Smelting at 1450-1550 ℃, casting under argon protection, and cooling naturally after casting to obtain steel ingots; after remelting the steel ingots with protective atmosphere electroslag remelting technology, heat preservation at 1250 ℃, and then forging and cooling; It was kept at 850°C and then cooled to room temperature in sections with the furnace to obtain modified 4Cr5MoSiV1 hot work die steel. The invention improves the yield of rare earth in steel by adding rare earth intermediate alloy and utilizes the interaction of various components; reduces the segregation of Cr, Mo, V and other alloy elements at the grain boundary, and achieves the purpose of reducing dendrite segregation; The as-cast structure of the steel is improved, and the mechanical properties such as the fatigue life 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 failures such as fracture, plastic deformation, wear, softening, fatigue and other failure modes in the process of processing and forming parts of hot working molds, it is required that hot working mold materials have excellent strength, toughness, plasticity, wear resistance, resistance Temper softening properties. [0003] 4Cr5MoSiV1 hot work die steel (ie H13 steel) has very excellent hardenability, good toughness, high wear resistance, good thermal fatigue and other characteristics, so it is often used as hot forging die steel. Although its comprehensive properties are outstanding, its secondary hardening ability during tempering is poor. When the service temperature is higher than 540°C (1000°F), the hardness decreases rapidly, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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