Dual-phase heterogeneous light-weight high-strength steel and preparation method thereof

A technology of high-strength steel and high-strength steel plate, which is applied in the field of dual-phase heterogeneous light-weight high-strength steel and its preparation, can solve the problem of deterioration of strength and toughness, weldability, density and rust resistance of light-weight high-strength steel for automobiles, and high cost of alloying element addition. , the preparation process is complicated and other problems, to achieve the effect of light weight, increase strong plastic product, and simple preparation process

Active Publication Date: 2022-02-25
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem solved by the present invention is that the cost of adding alloy elements in the light-weight high-strength steel for automobiles in the prior art is high, the preparation process is complicated, and the operation is difficult, and the added alloy elements will deteriorate the strength and toughness of the light-weight high-strength steel for automobiles , weldability, density and rust resistance, not conducive to industrial production

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  • Dual-phase heterogeneous light-weight high-strength steel and preparation method thereof
  • Dual-phase heterogeneous light-weight high-strength steel and preparation method thereof
  • Dual-phase heterogeneous light-weight high-strength steel and preparation method thereof

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Embodiment 1

[0039] A dual-phase heterogeneous lightweight high-strength steel, the chemical composition of which is calculated by mass percentage: C 0.14wt.%, Mn13.9wt.%, Al 6.1wt.%, Si 0.68wt.%, P≤0.01wt.% , S≤0.005wt.%, the rest is Fe and unavoidable impurities.

[0040] The preparation method of the dual-phase heterogeneous light-weight high-strength steel, the preparation method includes the following steps:

[0041] S1. Raw material selection: Weigh Fe, Mn, C, Al, Si powders with purity ≥ 99.9% according to the chemical composition ratio of the dual-phase heterogeneous light-weight high-strength steel as alloy raw materials, and put the alloy raw materials into the electric In the magnetic induction furnace, vacuum melting is carried out under the protection of argon, and then the molten steel is cast into ingots;

[0042] S2. Hot forging after homogenization treatment: homogenize the ingot described in step S1, the temperature of the homogenization treatment is 1200±30°C, and the hol...

Embodiment 2

[0049] A dual-phase heterogeneous lightweight high-strength steel, the chemical composition of which is calculated by mass percentage: C 0.22wt.%, Mn12.1wt.%, Al 7.2wt.%, Si 0.63wt.%, P≤0.01wt.% , S≤0.005wt.%, the rest is Fe and unavoidable impurities.

[0050] The preparation method of the dual-phase heterogeneous light-weight high-strength steel, the preparation method includes the following steps:

[0051] S1. Raw material selection: Weigh Fe, Mn, C, Al, Si powders with purity ≥ 99.9% according to the chemical composition ratio of the dual-phase heterogeneous light-weight high-strength steel as alloy raw materials, and put the alloy raw materials into the electric In the magnetic induction furnace, vacuum melting is carried out under the protection of argon, and then the molten steel is cast into ingots;

[0052] S2. Hot forging after homogenization treatment: homogenize the ingot described in step S1, the temperature of the homogenization treatment is 1200±30°C, and the h...

Embodiment 3

[0059] A dual-phase heterogeneous lightweight high-strength steel, the chemical composition of which is calculated by mass percentage: C 0.28wt.%, Mn10.1wt.%, Al 8.1wt.%, Si 0.55wt.%, P≤0.01wt.% , S≤0.005wt.%, the rest is Fe and unavoidable impurities.

[0060] The preparation method of the dual-phase heterogeneous light-weight high-strength steel, the preparation method includes the following steps:

[0061] S1. Raw material selection: Weigh Fe, Mn, C, Al, Si powders with purity ≥ 99.9% according to the chemical composition ratio of the dual-phase heterogeneous light-weight high-strength steel as alloy raw materials, and put the alloy raw materials into the electric In the magnetic induction furnace, vacuum melting is carried out under the protection of argon, and then the molten steel is cast into ingots;

[0062] S2. Hot forging after homogenization treatment: homogenize the ingot described in step S1, the temperature of the homogenization treatment is 1200±30°C, and the h...

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Abstract

The invention discloses dual-phase heterogeneous light-weight high-strength steel and a preparation method thereof, and belongs to the technical field of light-weight high-strength automobile steel. The steel comprises the following chemical components in percentage by weight: 0.1-0.3 wt.% of C, 10-14 wt.% of Mn, 6-8 wt.% of Al, 0.5-0.7 wt.% of Si, less than or equal to 0.01 wt.% of P, less than or equal to 0.005 wt.% of S and the balance of Fe and inevitable impurities. The as-cast structure of the dual-phase heterogeneous light-weight high-strength steel is a complex-phase structure containing coarse fishbone-shaped delta ferrite and coarse granular austenite, and the structure of the prepared finished dual-phase heterogeneous light-weight high-strength steel plate is strip-shaped delta ferrite and fine equiaxed austenite. The yield strength of a finished biphase heterogeneous light high-strength steel plate is 388-807 MPa, the tensile strength is 656-945 MPa, the ductility is 33-55%, the product of strength and elongation is 31-38 GPa%, and the density is 6.9-7.1 g / cm<3>.

Description

technical field [0001] The invention belongs to the technical field of light-weight high-strength automobile steel, and relates to a dual-phase heterogeneous light-weight high-strength steel and a preparation method thereof. Background technique [0002] In recent decades, the automobile industry has developed rapidly, and the number of automobiles is on the rise. However, the following problems such as fuel shortage and automobile environmental pollution are becoming more and more serious, and energy conservation and environmental protection have become a new direction for the development of the automobile industry. [0003] The lightweight design of the car can not only reduce the weight of the car body on the premise of ensuring the safety of the car, but also improve the fuel economy of the car and reduce carbon emissions, which is an effective way to deal with the aforementioned problems. [0004] At present, there are two main ways to achieve lightweight: one is to fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/02C21D8/02C21D1/26
CPCC22C38/04C22C38/06C22C38/02C21D8/0221C21D8/0226C21D8/0236C21D8/0247C21D1/26C21D2211/005C21D2211/001
Inventor 刘帅刘焕优王明明冯运莉钱立和张福成
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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