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A kind of ultra-high strength steel with near-net shape and its preparation method

An ultra-high-strength steel, near-net-shape technology, applied in the field of high-strength steel manufacturing, can solve the problems of affecting the surface quality of parts, unable to meet near-net-shape, low precision of formed parts, etc., to improve the forming qualification rate, excellent near-net shape Forming, the effect of mechanical properties

Active Publication Date: 2020-05-19
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, during the hot stamping process of ultra-high-strength steel plates, high-temperature heating can easily lead to oxidation of the steel plate, and the residual oxide skin will rapidly increase the friction coefficient between the steel plate and the mold, resulting in low precision of formed parts, high forming load, Serious problems such as a significant reduction in mold life cannot meet the requirements of near-net shape and seriously affect the surface quality of parts

Method used

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  • A kind of ultra-high strength steel with near-net shape and its preparation method
  • A kind of ultra-high strength steel with near-net shape and its preparation method
  • A kind of ultra-high strength steel with near-net shape and its preparation method

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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, a kind of ultra-high-strength steel with near-net shape, according to the required requirements of ultra-high-strength steel with near-net shape, the preparation of ultra-high-strength steel with near-net shape includes the following mass percentages (wt.%) The components of:

[0028]

[0029] A method for preparing ultra-high-strength steel with near-net shape, the specific steps are as follows:

[0030] S1. Ingredients: weigh ingredients according to the above ratio;

[0031] S2. Alloy smelting: put the C, P, S, Si, B, Cr, Ti, Al and Fe elements weighed in step 1 into the crucible for vacuum induction melting. After the added elements are completely dissolved, start the magnetic stirring And continue smelting for 15 minutes; then stop heating for 10 seconds, then add Mn and Nb elements into the melt and continue heating for 10 minutes. Then stop heating, let the liquid alloy cool with the furnace, and pour it into the ingot mold when t...

Embodiment 2

[0036] Such as figure 1 As shown, a kind of ultra-high-strength steel with near-net shape, according to the required requirements of ultra-high-strength steel with near-net shape, the preparation of ultra-high-strength steel with near-net shape includes the following mass percentages (wt.%) The components of:

[0037]

[0038] A method for preparing ultra-high-strength steel with near-net shape, the specific steps are as follows:

[0039] S1. Ingredients: weigh ingredients according to the above ratio;

[0040] S2. Alloy smelting: put the C, P, S, Si, B, Cr, Ti, Al and Fe elements weighed in step 1 into the crucible for vacuum induction melting. After the added elements are completely dissolved, start the magnetic stirring And continue smelting for 18 minutes; then stop heating for 15 seconds, then add Mn and Nb elements into the melt and continue heating for 15 minutes. Then stop heating, let the liquid alloy cool with the furnace, and pour it into the ingot mold to for...

Embodiment 3

[0045] Such as figure 1 As shown, a kind of ultra-high-strength steel with near-net shape, according to the required requirements of ultra-high-strength steel with near-net shape, the preparation of ultra-high-strength steel with near-net shape includes the following mass percentage (wt.%) The components of:

[0046]

[0047] A method for preparing ultra-high-strength steel with near-net shape, the specific steps are as follows:

[0048] S1. Ingredients: weigh ingredients according to the above ratio;

[0049] S2. Alloy smelting: put the C, P, S, Si, B, Cr, Ti, Al and Fe elements weighed in step 1 into the crucible for vacuum induction melting. After the added elements are completely dissolved, start the magnetic stirring And continue the smelting time for 20min; then stop heating for 20s, then add Mn and Nb elements into the melt and continue heating for 20min. Then stop heating, let the liquid alloy cool with the furnace, and pour it into the ingot mold to form an allo...

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Abstract

The invention discloses ultrahigh-strength steel with a near net shaping function and a preparation method thereof, and belongs to the technical field of manufacturing of ultrahigh-strength steel. Thepreparation method comprises the steps of S1, material preparation; S2, alloy smelting; S3, performance heat treatment, specifically, an alloy ingot obtained in step S2 is placed in a heat treatmentfurnace so as to be subject to performance heat treatment, and according to the specific process of performance heat treatment, heat preservation is conducted for 12-24 h at the temperature of 900-1150 DEGC, then the alloy ingot is cooled to the temperature of 500-750 DEGC with the furnace and then is maintained at the temperature of 5-10 h, and finally, the alloy ingot is air-cooled to the room temperature; and S4, pressure processing of alloy. Compared with similar materials, the ultrahigh-strength steel having the near net shaping function and prepared through the process has the advantagesof excellent mechanical property and near net shaping function.

Description

technical field [0001] The invention relates to an ultra-high-strength steel with near-net shape and a preparation method thereof, belonging to the technical field of high-strength steel manufacturing. Background technique [0002] The core of the manufacture of ultra-high-strength steel automotive safety components lies in hot stamping technology. Hot stamping forming technology is an ideal ultra-high-strength steel sheet forming method that can achieve small loads, large deformations, and eliminate springback effects. This technology pre-austenizes the sheet metal before stamping processing, and quenching during the stamping process, so that the steel forms a martensitic structure after forming, and realizes the precise forming and strengthening of ultra-high-strength steel plates. However, the hot stamping process is complicated, the temperature sensitivity of sheet metal forming is large, and the sheet metal is easy to crack. Under different parameter conditions, the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/32C22C38/28C22C38/26C22C38/06C22C38/38C22C33/04C21D8/00
CPCC21D8/005C22C33/04C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C38/32C22C38/38
Inventor 巨佳王章忠张思斌刘壮张保森毛向阳巴志新李旋李华冠
Owner NANJING INST OF TECH
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