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Medium manganese steel with high product of strength and elongation and preparation method thereof

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

Active Publication Date: 2021-02-26
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Medium manganese steel with high product of strength and elongation and preparation method thereof
  • Medium manganese steel with high product of strength and elongation and preparation method thereof
  • Medium manganese steel with high product of strength and elongation and preparation method thereof

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Embodiment 1

[0048] This embodiment provides a kind of high-strength plastic product medium manganese steel, and its preparation method comprises:

[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 forge it into a slab, and cool it to room temperature in air; use the wire cutting technology to perform wire cutting on the slab, and cut out 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, with a warm rolling reduction rate of 50%, to make a warm rolled plate and air cool to room temperature; two adjacent Intermediate annealing is carried out between the warm rolling processes of the passes. The annealing temperature is 800° C. for 10 mi...

Embodiment 2

[0063] This embodiment provides a high-strength plastic product medium manganese steel, the preparation method of which is basically the same as that of Embodiment 1, except that:

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

[0065] Performance tests were carried out on the prepared three groups of medium manganese steel plates, and the results are shown in Table 2:

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

[0067] Plate holding time tensile strength elongation after break strong plastic product Yield Strength 15min 1112.12MPa 76.75％ 85.36GPa·% 625.19MPa 30min 1105.62 MPa 76.87％ 84.99GPa·% 570.32 M...

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Abstract

The invention provides medium manganese steel with the high product of strength and elongation and a preparation method thereof, and belongs to the field of automobile steel. The medium manganese steel comprises the following chemical components including, by weight, 0.1%-0.3% of C, 4%-12% of Mn and the balance Fe. The preparation method of the medium manganese steel comprises the following stepsof taking the chemical components of the medium manganese steel according to the weight percentage to smelt molten steel, casting the molten steel to form a cast ingot, forging the cast ingot into a plate blank, conducting air cooling to room temperature, and cutting to obtain a plate; carrying out multi-pass warm rolling treatment on the plate to obtain a warm rolled plate, wherein critical zoneannealing treatment is carried out between every two adjacent passes; and enabling the warm rolled plate to be annealed and subjected to heat preservation for 20-40 min at the temperature of 780-810 DEG C in a critical zone, and conducting air cooling to the room temperature. According to the preparation method, an ultra-fine grain medium manganese steel structure with a coarse grain austenite structure and a fine grain austenite structure is prepared through a circulating warm rolling and critical annealing process, so that the material obtains the ultra-high product of strength and elongation, and the strength and toughness of the automobile steel are improved.

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 its development, 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 30Gpa·%. How to obtain a medium manganese steel plate with higher strength-plastic product performance has become a research trend today. At the same time, from the perspective of the microstructure, due to the austenite in the cold rolling process of the...

Claims

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Application Information

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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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