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

A technology of high-strength plastic product and middle-manganese steel, applied in the field of automobile steel, can solve the problems of uneven structure of medium-manganese steel, large deformation resistance of medium-manganese steel, low strength and plastic product, etc. The effect of rolling deformation resistance and good flatness

Active Publication Date: 2022-07-26
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, from the perspective of the microstructure, due to the austenite in the cold rolling process of the medium manganese steel, the martensitic structure is formed due to deformation, resulting in a large deformation resistance of the medium manganese steel during the cold rolling process. At the same time, due to the single pass cold The structure of medium manganese steel obtained by rolling and reverse phase transformation annealing process is not uniform, which leads to poor mechanical properties and low strength and plasticity of medium manganese steel

Method used

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

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Effect test

Embodiment 1

[0048] The present embodiment provides a high-strength plastic product medium manganese steel, and its preparation method includes:

[0049] 1. Smelt molten steel according to the set composition, and then cast it into a 20kg ingot; the mass percentage of molten steel is: C: 0.26%, Mn: 10.02%, Al: 2.86%, Si: 1.86%, and the balance is Fe and unavoidable of impurities.

[0050] 2. Heat the ingot to 1200°C, hold it for 2 hours, and then forge it into a slab, then air-cool it to room temperature; use wire cutting technology to wire-cut the slab, and cut a steel plate with a thickness of 3mm.

[0051] 3. Heat the steel plate to 400°C for 1 hour, and then carry out three passes of warm rolling, from 3mm to 1.5mm, and the warm rolling reduction rate is 50%, and make the warm rolled plate air-cooled to room temperature; Intermediate annealing is performed between the warm rolling processes of the passes, the annealing temperature is 800°C, and the time is 10 minutes, and then it is c...

Embodiment 2

[0063] The present embodiment provides a high-strength plastic product medium manganese steel, the preparation method of which is basically the same as that of embodiment 1, and the difference is:

[0064] The warm-rolled sheet obtained after the three-pass warm rolling + annealing process in step 3 was kept at 800 ° C for 15 min, 30 min, and 60 min, respectively. The heat treatment process was as follows: image 3 and then air-cooled to room temperature to make three groups of medium manganese steel sheets with high strength and plastic product.

[0065] The three groups of medium manganese steel sheets were tested for performance, and the results are shown in Table 2:

[0066] Table 2. Performance test results of medium manganese steel sheets

[0067] The holding time of the board tensile strength Elongation after break Strong plastic product Yield Strength 15min 1112.12MPa 76.75％ 85.36GPa·% 625.19MPa 30min 1105.62MPa 76.87％ 84.99GPa ...

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Abstract

The invention provides a high-strength plastic product medium manganese steel and a preparation method thereof, belonging to the field of automobile steel. The chemical composition of the medium manganese steel includes, by weight percentage: C: 0.1-0.3%, Mn: 4-12%, and the balance is Fe; the preparation method includes: taking the chemical composition of the medium manganese steel by weight percentage to smelt molten steel, Casting into an ingot, then forging the ingot into a slab, air-cooling to room temperature, and cutting to obtain a plate; subjecting the plate to multi-pass warm rolling treatment to obtain a warm-rolled plate; in which, critical zone annealing is performed between two adjacent passes. Treatment; the warm-rolled sheet is annealed at 780-810° C. in the critical zone for 20-40 minutes, and air-cooled to room temperature. The invention prepares an ultra-fine-grained medium-manganese steel structure with a coarse-grained austenite and a fine-grained austenite structure through a cyclic warm rolling + critical annealing process, so that the material obtains an ultra-high-strength plastic product and helps to improve the steel for automobiles. strength and toughness.

Description

technical field [0001] The invention relates to the field of steel for automobiles, in particular to a high-strength plastic product medium manganese steel and a preparation method thereof. Background technique [0002] Since the development of today, due to the development of automotive steel towards lightweight and high safety standards, the medium manganese steel sheet used in automobiles has been innovated to the third generation of advanced automotive steel, with high strength-plastic product (strength-plastic product 30Gpa %) The third generation of automotive steel. [0003] From the perspective of macroscopic mechanical properties, the strength-plastic product of the traditional third-generation automotive advanced steel is 30 Gpa·%. How to obtain medium-manganese steel sheets with higher strength-plastic product performance has become a research trend today. At the same time, from the perspective of microstructure, due to the appearance of austenite during the cold...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/02C22C38/08C22C38/12C22C38/16C22C38/18C22C33/04C21D8/02C21D1/26
CPCC22C38/04C22C38/06C22C38/02C22C38/08C22C38/12C22C38/16C22C38/18C22C33/04C21D8/0231C21D8/0273
Inventor 陈雷刘胜杰贾祺祥陈义成陈军
Owner YANSHAN UNIV
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