A kind of medium manganese ultra-high strength steel and preparation method thereof

A technology of ultra-high-strength steel and preparation steps, applied in the field of advanced ultra-high-strength steel, can solve the problems of improving the production difficulty of Q&P steel, and achieve the effects of facilitating the diffusion of elements, simple composition, and excellent mechanical properties

Active Publication Date: 2020-10-02
UNIV OF SCI & TECH BEIJING
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In addition, in the traditional Q&P treatment, the quenching temperature T Q It has a significant impact on the final structure of the material, so the quenching temperature needs to be precisely controlled in the heat treatment process, which greatly increases the difficulty of Q&P steel production

Method used

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  • A kind of medium manganese ultra-high strength steel and preparation method thereof
  • A kind of medium manganese ultra-high strength steel and preparation method thereof
  • A kind of medium manganese ultra-high strength steel and preparation method thereof

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preparation example Construction

[0038] The second aspect of the present invention provides the preparation method of the above-mentioned medium manganese ultra-high strength steel, the schematic diagram of the preparation process is as follows figure 1 As shown, specifically, the casting slab of medium manganese ultra-high-strength steel satisfying the chemical composition is subjected to the following preparation steps:

[0039] (1) The casting slab is kept in a heating furnace at 1180-1230° C. for 1-2 hours for uniform austenitization.

[0040] (2) The cast slab of the step (1) is subjected to two passes of rough rolling and multi-pass finish rolling, and the finish rolling temperature is 850-950° C., then water-cooled or air-cooled to room temperature to obtain a slab with a thickness of 2-8 mm. Hot rolled steel strip.

[0041] (3) heating the hot-rolled steel strip of the step (2) to the austenitizing temperature T in the critical zone IA = 750-950°C heat preservation for 2-10min, then water-cooled or ...

Embodiment 1

[0045] The chemical composition of this embodiment is 0.34% C, 3.95% Mn, 1.08% Al, 1.54% Si, 0.006% P, 0.014% S in terms of mass percentage, and the rest is Fe and unavoidable impurity elements.

[0046] The preparation process is as follows: heat the slab with the above composition in a heating furnace at 1200°C for 1.5h, and after uniform austenitization, carry out two passes of rough rolling, multi-pass finish rolling, and finish rolling at a temperature of 942°C, air cooling After reaching room temperature, a hot-rolled steel strip with a thickness of 3 mm is obtained, and the structure of the hot-rolled steel strip is a full martensitic structure. The hot-rolled steel strips are respectively heated to the austenitizing temperature T in the critical zone in an ordinary muffle furnace IA = 800°C, 830°C, holding time 4min, water cooling to room temperature, obtained quenched steel strip with microstructure of lath morphology critical zone ferrite (IF), quenched martensite (F...

Embodiment 2

[0049] The chemical composition of this embodiment is 0.33% C, 3.86% Mn, 1.85% Al, 1.55% Si, 0.006% P, 0.015% S in terms of mass percentage, and the rest is Fe and unavoidable impurity elements.

[0050] The preparation process of this example is basically the same as that of Example 1, except that the finish rolling temperature is 947°C, the thickness of the hot-rolled steel strip is 4mm, and the microstructure of the hot-rolled steel strip is 2% ferrite by volume fraction. The martensitic matrix organization of the organization. Critical zone austenitization T IA The temperature was 825°C, 850°C, and 900°C respectively, and the holding time was 5.5 minutes. put it to T TP = 450° C. in a muffle furnace for 250 s and tempering, the medium manganese ultra-high strength steel strip of this embodiment was obtained, and its corresponding mechanical properties are shown in Table 1. Among them, T IA =825°C for 5.5 minutes, T TP = 450 ℃ heat preservation 250s steel strip, its ty...

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Abstract

The invention discloses middle-manganese ultrahigh-strength steel and a preparation method thereof. The chemical components of the steel comprise, by mass, 0.20%-0.45% of C, 3.0%-6.0% of Mn, 1.0%-4.0%of Si, 0.5%-3.0% of Al, smaller than or equal to 0.01% of P, smaller than or equal to 0.02% of S, 0%-0.05% of Nb, 0%-0.05% of V, 0%-0.05% of Ti and the balance Fe and unavoidable impurities, whereinthe content of Al and Si is larger than or equal to 1.5% and smaller than or equal to 5.5%, and the content of Nb, V and Ti is larger than or equal to 0% and smaller than or equal to 0.05%. When the middle-manganese ultrahigh-strength steel is prepared, a quenching and tempering technology is adopted, the temperature is lowered to the room temperature RT through air cooling or water cooling by adjusting the critical zone austenization TIA temperature, and then the carbon distribution substep is completed through tempering treatment. According to the middle-manganese ultrahigh-strength steel and the preparation method thereof, the technology is simple, the tensile strength of the prepared middle-manganese ultrahigh-strength steel can reach 1,150-1,950 MPa, and the highest product of strength and elongation can reach 40 GPa.% or above.

Description

technical field [0001] The invention belongs to the technical field of advanced ultra-high-strength steel, in particular to a medium-manganese ultra-high-strength steel and a preparation method thereof through quenching and tempering. Background technique [0002] Energy saving, environmental protection, and safety are the fundamental goals of the development of automotive materials, and advanced high-strength steel is one of the best raw materials for effectively reducing the weight of automobiles. The development of advanced high strength steel (AHSS) has gone through the first generation of AHSS represented by dual phase steel and the second generation of AHSS represented by high manganese TWIP steel. The third-generation AHSS has both the low alloy cost advantages of the first-generation AHSS and the high-performance advantages of the second-generation AHSS, and its typical representatives are medium manganese steel and Q&P steel. The room temperature microstructure of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0263C21D2211/001C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 赵征志梁驹华陈伟健刘杰康涛李枫高鹏飞梁江涛莫志英何青薛建忠曹荣华唐荻
Owner UNIV OF SCI & TECH BEIJING
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