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Cold rolled medium manganese steel with ultra-high strength and ductility product and preparation method thereof

An ultra-high-strength, manganese-steel technology, which is applied in the field of ultra-high-strength plastic product cold-rolled automotive steel sheets and its preparation, can solve problems such as high cost, low plasticity, and difficulties in smelting and production, achieve excellent formability, and improve tensile strength The effect of intensity

Active Publication Date: 2016-11-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength and plasticity of steel for the first generation of automobiles is at the level of 15-20GPa%, which has been difficult to meet the dual requirements of the automobile industry for lightweight and high safety in the future.
The strength and plasticity of the second-generation automotive steel can reach 60GPa%, but it adds a large amount of elements such as Mn, Si, Al, Cr, Ni, etc., and its cost is relatively high. There are certain difficulties in smelting and production.
[0003] The traditional second-generation automotive steel such as TWIP steel, although its elongation can reach 60-80%, has a low yield strength of about 300-400MPa; while the third-generation automotive steel has a fine structure and a high yield strength, reaching 600-700MPa, but its plasticity is low, generally not more than 45%

Method used

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  • Cold rolled medium manganese steel with ultra-high strength and ductility product and preparation method thereof
  • Cold rolled medium manganese steel with ultra-high strength and ductility product and preparation method thereof
  • Cold rolled medium manganese steel with ultra-high strength and ductility product and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The chemical composition and mass percentage of the steel are as follows: C: 0.28%, Mn: 7.17%, Al: 2.1%, and the remainder is Fe and unavoidable impurities. The steel ingot is smelted in a vacuum induction furnace, the steel ingot is heated to 1200°C for 2 hours, and then forged into a billet.

[0032] Heat the steel billet to 1200°C for 2 hours, and hot-roll it into a thin plate with a thickness of 4mm through 6-12 passes. The final rolling temperature is not lower than 820°C, and then air-cool to room temperature.

[0033] Put the hot-rolled sheet into a heating furnace, anneal at about 700°C for 0.5h, and then air-cool to room temperature.

[0034] After the hot-rolled annealed sheet was pickled, it was cold-rolled at room temperature, and the cold-rolling reduction was 50%.

[0035] Heat different cold-rolled sheets to the annealing temperature in a heating furnace, according to 1040-89[C%]-5[Mn%]+5[Al%]≥T(K)≥1010-89[C%]-5 [Mn%]+5[Al%] calculation, between 687-717°C...

Embodiment 2

[0038] The chemical composition and mass percentage of the steel are as follows: C: 0.33%, Mn: 7.98%, Al: 2.95%, and the remainder is Fe and unavoidable impurities. The ingot is smelted in a vacuum induction furnace, the ingot is heated to 1200°C for 2 hours, and then forged into a billet.

[0039] Heat the steel billet to 1200°C for 2 hours, and hot-roll it into a thin plate with a thickness of 4mm through 6-12 passes. The final rolling temperature is not lower than 820°C, and then air-cool to room temperature.

[0040] Put the hot-rolled sheet into a heating furnace, anneal at about 700°C for 10 hours, and then air-cool to room temperature.

[0041] After the hot-rolled annealed sheet was pickled, it was cold-rolled at room temperature, and the cold-rolling reduction was 70%.

[0042] Heat different cold-rolled sheets to the annealing temperature in a heating furnace, according to 1040-89[C%]-5[Mn%]+5[Al%]≥T(K)≥1010-89[C%]-5 [Mn%]+5[Al%] calculation, between 682-712°C, tak...

Embodiment 3

[0045] The chemical composition and mass percentage of the steel are as follows: C: 0.25%, Mn: 9.23%, Al: 2.6%, and the balance is Fe and unavoidable impurities. The ingot is smelted in a vacuum induction furnace, the ingot is heated to 1200°C for 2 hours, and then forged into a billet.

[0046] Heat the steel billet to 1200°C for 2 hours, and hot-roll it into a thin plate with a thickness of 4mm through 6-12 passes. The final rolling temperature is not lower than 820°C, and then air-cool to room temperature.

[0047] Put the hot-rolled sheet into a heating furnace, anneal at about 700°C for 1 hour, and then air-cool to room temperature.

[0048] After the hot-rolled annealed sheet was pickled, it was cold-rolled at room temperature, and the cold-rolling reduction was 70%.

[0049] Heat different cold-rolled sheets to the annealing temperature in a heating furnace, according to 1040-89[C%]-5[Mn%]+5[Al%]≥T(K)≥1010-89[C%]-5 [Mn%]+5[Al%] is calculated between 680-710 degrees, t...

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Abstract

The invention relates to cold rolled medium manganese steel with an ultra-high strength and ductility product and a preparation method thereof, and belongs to the technical field of steel for automobiles. The key point of the cold rolled medium manganese steel with the ultra-high strength and ductility product and the preparation method thereof lies in that partitioning of alloy elements is realized by reasonable chemical components and process designs. The components comprise, by mass percentage, 0.25-0.35% of C, 7.0-9.5% of Mn, and 2-2.9% of Al, with the balance being Fe and inevitable impurities. According to the preparation method, a stable retained austenite phase with an enough percentage is obtained by hot rolling, hot rolling annealing, acid pickling, cold rolling (rolling reduction is greater than or equal to 20%) and annealing in a specified temperature interval. Accordingly phase transformation induced plasticity takes place during deforming, finally the strength of extension of the obtained medium manganese steel is 900-1300 MPa, the elongation percentage is 50-80%, and the strength and ductility product increases to 60 GPa.% or above and is up to 90 GPa.%.

Description

[0001] The invention belongs to the technical field of steel for automobiles, and relates to a cold-rolled automobile steel plate with ultra-high strength plasticity and a preparation method thereof. Background technique [0002] With the continuous improvement of the automotive industry's requirements for energy saving, environmental protection and safety, high-strength and plastic-plastic automotive structural steel has increasingly become the focus of attention. The strength and plasticity of steel for the first generation of automobiles is at the level of 15-20GPa%, which has been difficult to meet the dual requirements of the automobile industry for lightweight and high safety in the future. The strength and plasticity of the second-generation automotive steel can reach 60GPa%, but it adds a lot of elements such as Mn, Si, Al, Cr, Ni, etc., its cost is high, and its smelting production has certain difficulties. The third-generation automotive steel developed in recent yea...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C21D8/02C21D6/00
CPCC21D6/005C21D8/0247C22C38/04C22C38/06
Inventor 罗海文
Owner UNIV OF SCI & TECH BEIJING
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