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A hot-rolled medium-manganese steel with high-strength plastic product and no plastic instability and its preparation method

An unstable, high-strength plastic product technology, applied in high-strength plastic product and no plastic instability hot-rolled medium manganese steel plate and its preparation, in the field of automotive steel, can solve the problem of reducing the surface quality of formed parts and the impact of sheet metal processing and forming performance, etc. problems, to achieve the effect of good formability, high strength, and strong impact energy absorption capacity

Active Publication Date: 2021-02-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After the medium manganese steel undergoes critical zone annealing, plastic instability phenomena such as yield point elongation and Portevin-Le Chatelier effect often appear during the tensile deformation process. These two uneven deformation phenomena will make Sheet metal processing and forming properties are affected, reducing the surface quality of formed parts

Method used

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  • A hot-rolled medium-manganese steel with high-strength plastic product and no plastic instability and its preparation method
  • A hot-rolled medium-manganese steel with high-strength plastic product and no plastic instability and its preparation method
  • A hot-rolled medium-manganese steel with high-strength plastic product and no plastic instability and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The measured chemical composition of the manganese steel in Example 1 is shown in Table 1. The manganese steel with the above composition was smelted in a vacuum induction furnace for 40 minutes, cooled to room temperature to obtain a steel ingot, and a steel billet with a thickness of 70 mm was cut.

[0025] Manganese steel measured chemical composition (wt%) in the embodiment of table 1

[0026] C Si mn P S Al Fe 0.30 0.028 9.28 0.0075 0.0088 2.15 margin

[0027] Hot rolling was performed on a laboratory 4-high reversing mill. Heat the steel billet to 1180°C-1200°C for 2 hours, and then conduct multi-pass hot rolling. The starting temperature is 1100°C-1150°C. After 6 passes, it is rolled into a steel plate with a thickness of 3mm. The final rolling temperature is not lower than 900°C. Laminar cooling after rolling, the coiling temperature is 300℃~400℃.

[0028] The hot-rolled plate is annealed in the two-phase zone, the annealing t...

Embodiment 2

[0031] The chemical composition, smelting, and hot-rolling process of the steel are the same as in Example 1, except that the hot-rolled plate is annealed in the two-phase zone. The annealing process in the two-phase zone is at 630° C., the holding time is 30 minutes, and air-cooled to room temperature.

[0032] The microstructure observation ( Figure 4 ) and mechanical performance tests. Process the steel plate annealed in the two-phase region into a tensile sample with a gauge length of 50 mm, and conduct a uniaxial tensile test with the tensile rate set at 10 -3 the s -1 . Tensile result engineering stress-strain curve such as Figure 5 shown. It can be seen that after annealing in the two-phase region of the hot-rolled medium-manganese steel, its tensile strength is about 1000MPa, the strength-plastic product is greater than 30GPa·%, and the stress-strain curve shows continuous yield without stress vibration and other plastic instability. Phenomenon. This is closely...

Embodiment 3

[0034] The chemical composition, smelting, and hot-rolling process of the steel are the same as in Example 1, except that the hot-rolled plate is annealed in the two-phase zone. The annealing process in the two-phase zone is at 680° C., the holding time is 30 minutes, and air-cooled to room temperature.

[0035] The microstructure observation ( Image 6 ) and mechanical performance tests. Process the steel plate annealed in the two-phase region into a tensile sample with a gauge length of 50 mm, and conduct a uniaxial tensile test with the tensile rate set at 10 -3 the s -1 . Tensile result engineering stress-strain curve such as Figure 7 shown. It can be seen that the strength and elongation of the hot-rolled medium-manganese steel are higher after annealing in the two-phase region at 680°C for 30 minutes, but there is a phenomenon of stress jitter, which affects the formability of the sheet, and its microstructure is austenite and iron The two-phase structure of the ma...

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Abstract

The invention discloses a hot-rolled medium manganese steel plate with high-strength plastic product and no plastic instability and a preparation method thereof, belonging to the technical field of steel for automobiles. Its chemical composition is: C0.25~0.35%, Mn8.50~9.50%, Al1.7%~2.3%, Si0.03~0.07%, P<0.01%, S<0.01%, the balance is Fe and not Avoid impurities. The preparation steps are: raw material preparation, smelting, and casting; the steel billet is heated to 1180°C-1200°C for 2 hours and then subjected to multi-pass hot rolling. flow cooling, the coiling temperature is 300°C-400°C; the hot-rolled plate is finally annealed in the two-phase zone, the annealing temperature in the two-phase zone is 630°C-640°C, and the holding time is 30min. The medium manganese steel of the present invention is not forged and has large crystal grains, which is helpful to realize short-flow continuous casting and rolling of thin slabs, and the microstructure presents lath-like ferrite + austenite two-phase matrix and fine cementite precipitates . The tensile strength is greater than 1000MPa, the strong-plastic product is greater than 30GPa·%, the stress-strain curve has no yield platform, showing continuous yield and no stress vibration and other plastic instability phenomena. The hot-rolled sheet has good formability, high strength and strong impact energy absorption capacity.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to steel technology for automobiles, in particular to a hot-rolled medium manganese steel plate with high strength and plasticity and no plastic instability and a preparation method thereof. Background technique [0002] In response to the development trend of automobile lightweight and the ever-increasing safety performance requirements, automobile steel is developing towards higher strength, higher plasticity, lower cost and easy processing and forming. The comprehensive performance of the third-generation automobile steel is more than double that of the first-generation automobile steel, and its strength-plastic product reaches 25GPa·%-50GPa·%. As a typical representative of the third-generation automotive steel, medium manganese steel usually contains 5wt%-12wt% manganese. Due to the fine grain size, ferrite and austenite already have high strength, while retained austenite is in Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/02C21D8/02
CPCC21D8/0226C21D2211/001C21D2211/003C21D2211/005C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 王永金张哲睿赵帅霍巍丰马泽天宋仁伯
Owner UNIV OF SCI & TECH BEIJING
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