Preparing method of medium manganese steel material with high yield ratio and continuous yielding

A technology of high yield ratio and medium manganese steel, which is applied in the field of preparation of medium manganese steel materials, can solve the problems of residual Lüders band, low yield strength, and reduced anti-intrusion performance of automobile components, so as to achieve high yield ratio and improve position The effect of wrong density and improved deformation behavior

Active Publication Date: 2019-05-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although a large number of research results have verified that medium manganese steel has excellent mechanical properties, there are still deficiencies in its deformation behavior
The direct ART annealing of cold-rolled steel plate generally obtains recrystallized submicron equiaxed grains, and its performance is characterized by high yield strength, but there will be obvious yield plateau phenomenon, that is, discontinuous yield, which will make the surface of the workpiece plastically deformed. Lüders strips, which are not allowed in automotive stamped parts
If a complete austenitization-quenching process is added before ART annealing to obtain the initial structure of a quenched steel plate, and then ART annealing will obtain a lath-like microstructure, which can avoid discontinuous yielding, but will cause yield strength Low, reducing the anti-intrusion performance of automotive components

Method used

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  • Preparing method of medium manganese steel material with high yield ratio and continuous yielding
  • Preparing method of medium manganese steel material with high yield ratio and continuous yielding
  • Preparing method of medium manganese steel material with high yield ratio and continuous yielding

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Experimental program
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Effect test

Embodiment 1

[0024] 1. Molten steel is smelted according to the set composition, and steel billet is made by refining and continuous casting; its composition contains C0.05%, Si 1.54%, Mn 8.9%, Al 1.0%, P 0.005%, S 0.001%, N by weight percentage 0.004%, the rest is Fe and unavoidable impurities;

[0025] 2. Heat the billet to 1200°C, keep it warm for 90 minutes, then carry out rough rolling and finish rolling, and cool to 600°C to coil to obtain a hot-rolled steel strip; the rough rolling start temperature is 1170°C, the final rolling temperature is 1050°C, and the rough rolling temperature is 1050°C. Rolling cumulative rolling reduction rate is 50%; finishing rolling start temperature is 1020°C, finishing rolling temperature is 960°C, finishing rolling cumulative rolling reduction rate is 70%;

[0026] 3. Pickling the hot-rolled steel strip to remove surface oxide scale, and then cold-rolling, the total cold-rolling reduction rate is 50%, to obtain a cold-rolled steel strip;

[0027] 4. ...

Embodiment 2

[0035] 1. Molten steel is smelted according to the set composition, and steel billet is made by refining and continuous casting; its composition contains C0.15%, Si 2.0%, Mn7.0%, Al 2.05%, P 0.005%, S 0.001%, by weight percentage, N 0.004%, the rest is Fe and unavoidable impurities;

[0036] 2. Heat the steel billet to 1200°C, keep it warm for 90 minutes, then carry out rough rolling and finish rolling, and cool to 650°C to coil to obtain a hot-rolled steel strip; the rough rolling start temperature is 1160°C, the final rolling temperature is 1000°C, and the rough rolling temperature is 1000°C. Rolling cumulative rolling reduction rate is 60%; finishing rolling start temperature is 1030°C, finishing rolling temperature is 920°C, finishing rolling cumulative rolling reduction rate is 60%;

[0037] 3. Pickling the hot-rolled steel strip to remove surface oxide scale, then cold-rolling, the total reduction rate of cold-rolling is 40%, and obtaining the cold-rolled steel strip;

...

Embodiment 3

[0046] 1. Molten steel is smelted according to the set composition, and steel billet is made by refining and continuous casting; its composition contains C0.1%, Si 1.0%, Mn 8.1%, Al 1.80%, P 0.003%, S 0.002%, N by weight percentage 0.006%, the rest is Fe and unavoidable impurities;

[0047] 2. Heat the steel billet to 1200°C, keep it warm for 60 minutes, then carry out rough rolling and finish rolling, and cool to 550°C to coil to obtain hot-rolled steel strip; the rough rolling start temperature is 1120°C, the final rolling temperature is 1040°C, and the rough rolling temperature is 1040°C. Rolling cumulative rolling reduction rate is 70%; finishing rolling start temperature is 1010°C, finishing rolling temperature is 930°C, finishing rolling cumulative rolling reduction rate is 80%;

[0048] 3. Pickling the hot-rolled steel strip to remove surface oxide scale, and then cold-rolling, the total cold-rolling reduction rate is 50%, to obtain a cold-rolled steel strip;

[0049] ...

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Abstract

The invention discloses a preparing method of a medium manganese steel material with the high yield ratio and continuous yielding. Molten steel is smelted according to set components, and a steel blank is made through refining and continuous casting; the steel blank comprises, by weight percent, 0.05 to 0.20% of C, 1.0 to 2.0% of Si, 7.0 to 11.0% of Mn, 1.0 to 3.0% of Al, not larger than 0.005% ofP, not larger than 0.005% of S, not larger than 0.006% of N and the balance Fe and inevitable impurities. Through the reasonable component design, rolling and continuous annealing process, a medium manganese steel strip microstructure comprises a certain incomplete-recrystallization variable form structure, the dislocation density is improved, the deforming behavior of the cold rolled medium manganese steel strip can be improved, and the deformation characteristics of high yield ratio and continuous yielding can be achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a method for preparing medium manganese steel, in particular to a method for preparing medium manganese steel material with high yield ratio and continuous yield. Background technique [0002] In recent years, with the demand for lightweight automobiles, advanced high-strength steels for automobiles have become a research and development hotspot. Among them, medium manganese steel is considered to be one of the most promising new steel types in the new generation of advanced high-strength steel for automobiles due to its excellent comprehensive properties. In the medium manganese steel, the Mn element is enriched in the austenite through the annealing of the two-phase region, so that it is stable below room temperature, and the martensitic transformation is promoted by the strain during the deformation process, that is, the TRIP effect, which can delay Necking, improving strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/04C22C38/02C21D1/26C21D8/02
Inventor 闫述梁涛沙李天乐陈敬琪赵阳
Owner NORTHEASTERN UNIV
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