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A variable strength hot stamping die material and its preparation method and application

A hot stamping die and variable strength technology, which is applied in the field of variable strength hot stamping die materials and its preparation, can solve the problems of poor crack growth resistance, easy cracking and failure of the die, and insufficient high temperature friction and wear performance, etc., to improve thermal stability Performance and high temperature anti-pilling performance, balanced comprehensive mechanical properties and organizational stability, good strength-toughness ratio and thermal conductivity

Active Publication Date: 2020-10-23
上大鑫仑材料科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Universal hot work die steel represented by H13 and DIEVAR, this type of hot work die steel has excellent strength-toughness ratio and thermal fatigue resistance, but its high temperature stability is poor, and high temperature friction and wear performance is not good , the surface of the die is easy to rough during use, so it cannot meet the performance requirements required for variable-strength hot stamping die steel
[0006] (2) Hot stamping die steel represented by HOTVAR and CR7V, this type of hot stamping die steel has excellent thermal stability, high temperature friction and wear performance, but its toughness is poor, and the ability to resist crack growth is not good. The die is prone to cracking and failure, so it cannot meet the performance requirements required by variable strength hot stamping die steel
[0007] (3) High thermal conductivity hot stamping die steel represented by HTCS-130. This type of hot stamping die steel has extremely high thermal conductivity and good toughness, but its high temperature friction and wear performance is insufficient. Highly prone to picking and thus does not meet the performance requirements required for variable strength hot stamping die steels
[0008] In summary, the hot work die steels or hot stamping die steels commonly used in the market are difficult to meet the stringent requirements of the variable strength hot stamping technology, and the special steel for the hot stamping forming dies of variable strength automobile panels needs to be developed urgently

Method used

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  • A variable strength hot stamping die material and its preparation method and application
  • A variable strength hot stamping die material and its preparation method and application
  • A variable strength hot stamping die material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, the mass percentage of the chemical composition of the special steel for the hot stamping forming die of the variable-strength automobile sheet used is as follows:

[0037]

[0038] In this embodiment, the preparation method of the special steel for the hot stamping forming die of the variable-strength automobile sheet is as follows:

[0039] 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, casting into a base metal for use, and then performing electroslag remelting, and cooling through a crystallizer to prepare Produce φ730mm electroslag ingot for standby.

[0040] Step 2. High-temperature diffusion annealing: heating the electroslag ingot to 1265° C. and keeping it for ≥16 hours.

[0041] Step 3. Hot forming: Cool the electroslag ingot that has been subjected to high-temperature homogenization to about 1180°C for ...

Embodiment 2

[0050] In this embodiment, the mass percentage of the chemical composition of the special steel for the hot stamping forming die of the variable-strength automobile sheet used is as follows:

[0051]

[0052] In this embodiment, the preparation method of the special steel for the hot stamping forming die of the variable-strength automobile sheet is as follows:

[0053] 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, casting into a base metal for use, and then performing electroslag remelting, and cooling through a crystallizer to prepare Produce φ730mm electroslag ingot for standby.

[0054] Step 2. High-temperature diffusion annealing: heating the electroslag ingot to 1250° C. and keeping it warm for ≥10 hours.

[0055] Step 3. Hot forming: Cool the electroslag ingot that has been subjected to high-temperature homogenization to about 1150°C...

Embodiment 3

[0064] In this embodiment, the mass percentage of the chemical composition of the special steel for the hot stamping forming die of the variable-strength automobile sheet used is as follows:

[0065]

[0066] In this embodiment, the preparation method of the special steel for the hot stamping forming die of the variable-strength automobile sheet is as follows:

[0067] 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, casting into a base metal for use, and then performing electroslag remelting, and cooling through a crystallizer to prepare Produce φ730mm electroslag ingot for standby.

[0068] Step 2. High-temperature diffusion annealing: heating the electroslag ingot to 1270° C. and keeping it warm for ≥12 hours.

[0069] Step 3. Hot forming: Cool the electroslag ingot that has been subjected to high-temperature homogenization to about 1200°C...

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Abstract

The invention discloses a variable-strength hot stamping die material. The variable-strength hot stamping die material comprises the following alloy elements of C, Si, Mn, Cr, Mo, V, P, S and Fe, andthe variable-strength hot stamping die material comprises, by mass percent, 0.40%-0.55% of C, smaller than or equal to 0.50% of Si, 0.85%-1.50% of Mn, 2.50%-3.50% of Cr, 2.00%-3.00% of Mo, 0.50%-0.80%of V, smaller than or equal to 0.010% of P, smaller than or equal to 0.001% of S and the balance Fe. The invention further discloses a preparing method of the variable-strength hot stamping die material and application of the die material in automobile manufacturing. The above variable-strength hot stamping die material has a good toughness ratio and heat conductivity, good heat stability and high-temperature galling preventing performance, the production cost is saved, the material conforms to the production idea of energy conservation, emission reduction and environment friendliness of ourcountry, and the reality requirement of the current automobile industry for the die material is met.

Description

technical field [0001] The invention relates to the technical field of alloy steel manufacturing technology, in particular to a variable-strength hot stamping die material and its preparation method and application. Background technique [0002] The traditional hot stamping process of high-strength steel plate is to quickly quench the whole plate to obtain high-strength parts. However, parts such as the A and B pillars of automobiles need higher strength to support the roof, and the lower part needs to be tough enough to absorb the impact generated by the side collision of the car. In order to realize this technical feature, variable strength hot stamping Technology came into being. Throughout the development status of variable strength hot stamping technology at home and abroad, the realization of variable strength hot stamping of steel plate is divided into four categories: 1. Partial heating method; 2. Differential cooling method; 3. Welding method; 4. Variable thickness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C21D1/26C21D1/18C21D8/00
CPCC21D1/18C21D1/26C21D8/005C22C38/002C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 吴晓春
Owner 上大鑫仑材料科技(上海)有限公司