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1500MPa hot stamping part cold trimming and punching tool die steel and preparation method thereof

A technology of die steel and cold trimming, which is applied in the field of cold blanking material manufacturing process, can solve the problems of inability to meet the production requirements of ultra-high strength steel plates, fracture and collapse, and prone to chipping, and achieve excellent chipping resistance and cracking resistance. , the effect of increased service life, good dimensional stability

Active Publication Date: 2021-12-03
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the most commonly used cold work die steel in China is Cr12MoV, which has high hardness and wear resistance. However, due to the existence of many large eutectic carbides in this material, the toughness is poor, and it is prone to chipping, fracture and collapse in long-term service. and other phenomena, so Cr12MoV cannot meet the production requirements of ultra-high-strength steel plates

Method used

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  • 1500MPa hot stamping part cold trimming and punching tool die steel and preparation method thereof
  • 1500MPa hot stamping part cold trimming and punching tool die steel and preparation method thereof
  • 1500MPa hot stamping part cold trimming and punching tool die steel and preparation method thereof

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Effect test

Embodiment 1

[0040] In this embodiment, the chemical composition of the mold steel material used for the cold-cut edge punching tool is shown in Table 1, and its preparation process is as follows:

[0041] a. Induction smelting: Put the ingredients in the medium frequency induction furnace according to the above chemical composition ratio, smelt at the temperature of 1500-1600 ℃, and then cast into steel ingots;

[0042] b. Electroslag remelting: remove the steel ingot riser before remelting, remove its surface scale, and put it in the electroslag remelting device as a consumable electrode for secondary refining; after the electrode alloy melts, it falls to the crystallizer through the slag pool and then solidified into steel ingots, the steel ingots gradually crystallized from bottom to top, with uniform composition and dense structure;

[0043] c. Forging: reheat the above treated steel ingot to 1200°C and keep it warm for 2 hours to make the alloy elements fully diffuse, then forge, the i...

Embodiment 2

[0057] In this embodiment, the chemical composition of the mold steel material used for the cold-cut edge punching tool is shown in Table 1, and its preparation process is as follows:

[0058] a. Induction smelting: Put the ingredients in the medium frequency induction furnace according to the above chemical composition ratio, smelt at the temperature of 1500-1600 ℃, and then cast into steel ingots;

[0059] b. Electroslag remelting: remove the steel ingot riser before remelting, remove its surface scale, and put it in the electroslag remelting device as a consumable electrode for secondary refining; after the electrode alloy melts, it falls to the crystallizer through the slag pool and then solidified into steel ingots, the steel ingots gradually crystallized from bottom to top, with uniform composition and dense structure;

[0060] c. Forging: Reheat the above treated steel ingot to 1220°C and keep it warm for 2 hours to make the alloy elements fully diffuse, and then forge....

Embodiment 3

[0074] In this embodiment, the chemical composition of the mold steel material used for the cold-cut edge punching tool is shown in Table 1, and its preparation process is as follows:

[0075] a. Induction smelting: according to the above chemical composition distribution ratio, the ingredients are placed in an intermediate frequency induction furnace, smelted at a temperature of 1600 ° C, and then cast into steel ingots;

[0076] b. Electroslag remelting: remove the steel ingot riser before remelting, remove its surface scale, and put it in the electroslag remelting device as a consumable electrode for secondary refining; after the electrode alloy melts, it falls to the crystallizer through the slag pool and then solidified into steel ingots, the steel ingots gradually crystallized from bottom to top, with uniform composition and dense structure;

[0077] c. Forging: Reheat the above-mentioned treated steel ingot to 1230°C and keep it warm for 4 hours to make the alloy elemen...

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Abstract

The invention discloses 1500MPa hot stamping part cold trimming and punching tool die steel and a preparation method thereof. The die steel comprises chemical components including, by weight percent, 0.65%-0.75% of C, 0.40%-0.60% of Si, 0.20%-0.40% of Mn, 4.50%-5.80% of Cr, 1.70%-1.90% of Mo, 0.55%-0.65% of V, less than or equal to 0.015% of P, less than or equal to 0.010% of S and the balance Fe and inevitable impurity elements. After being subjected to induction melting, electroslag remelting, forging, annealing and quenching and tempering heat treatment, the die steel has excellent anti-tipping and anti-cracking performance, and due to high hardness and high wear resistance, it is guaranteed that materials are not prone to abrasion or galling in the blanking process; and after a reasonable heat treatment process, good dimensional stability is achieved, and the size out-of-tolerance of a tool due to heat treatment is avoided.

Description

technical field [0001] The invention belongs to the field of cold blanking material manufacturing technology, and in particular relates to a die steel for cold cutting edge punching tools of 1500MPa hot stamping parts and a preparation method thereof. Background technique [0002] The strength of high-strength automotive panels continues to increase, and now it is possible to mass-produce automotive panels with a tensile strength of 1500MPa, which also puts forward higher requirements for molds for processing ultra-high-strength automotive panels. In order to reduce the difficulty of forming ultra-high-strength steel plates, obtain ultra-high-strength parts through structural transformation, and better control the springback of parts, steel plates are usually processed by hot stamping technology. After stamping and forming, there are often flashes, and some parts need to be punched, so it is necessary to trim and punch hot stamped parts. [0003] In actual industrial produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C38/22C22C38/02C22C38/04C21D8/00C21D1/26C21D1/18C21D6/04
CPCC22C38/24C22C38/22C22C38/02C22C38/04C21D8/005C21D1/26C21D1/18C21D6/04C21D2211/009Y02P10/25
Inventor 吴彦骏罗爱辉许冰徐伟力王晨磊洪振军
Owner BAOSHAN IRON & STEEL CO LTD
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