CN106086658A - In a kind of high intensity, carbon is containing chromium low manganese lightweight steel and preparation method - Google Patents

In a kind of high intensity, carbon is containing chromium low manganese lightweight steel and preparation method Download PDF

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Publication number
CN106086658A
CN106086658A CN201610444069.2A CN201610444069A CN106086658A CN 106086658 A CN106086658 A CN 106086658A CN 201610444069 A CN201610444069 A CN 201610444069A CN 106086658 A CN106086658 A CN 106086658A
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steel
lightweight steel
low manganese
high intensity
cold
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CN201610444069.2A
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CN106086658B (en
Inventor
何燕霖
董超
许衽
钱灵峰
朱旭东
李麟
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

Abstract

The present invention relates to carbon in a kind of high intensity and contain chromium low manganese lightweight steel and preparation method.Its percentage by weight is: C 0.20～0.40%, Al 4.0～6.0%, Mn 3.0～6.0%, Cr 0.2～1.5%, P < 0.02%, S < 0.01%, N < 0.004%, Fe surplus.Preparation method be by middle carbon low manganese lightweight steel Han chromium smelt in vaccum sensitive stove, in smelting process applying argon gas protection, then mold；After the demoulding, ingot casting is heated to 1200 DEG C, carries out hot rolling after being incubated 1 hour, and the breaking down temperature of hot rolling controls at 1050～1150 DEG C, and finishing temperature control is at 850～1000 DEG C, and after being hot-rolled down to 3mm, air cooling is to room temperature.By the cold-rolling of steel plate after hot rolling to 1.2mm, quickly it is cooled to 400 DEG C of insulation 3min after cold-reduced sheet is heated to 790～820 DEG C of annealing temperature insulation 1min and obtains the strength and ductility product lightweight steel more than 30GPa%.Compared with the high-strength steel of same intensity rank, the middle carbon of the present invention low manganese lightweight steel Han chromium has the ratio strength and ductility product of excellence.

Description

In a kind of high intensity, carbon is containing chromium low manganese lightweight steel and preparation method
Technical field
The present invention relates to carbon in a kind of high intensity and, containing chromium low manganese lightweight steel and preparation method, belong to special steel preparation technology skill Art.
Background technology
In order to tackle the most serious energy crisis and environmental pollution, the development trend of Hyundai Motor industry is light weight, joint Can, anti-corrosion and safety, use high intensity or ultrahigh-strength steel plates more, realize light-weight design reducing steel plate thickness.Advanced high Strong steel in the ratio of automobile steel by increasing to the 28%-36% of the year two thousand twenty from 7% in 2009, particularly in Asian countries, Ratio will be higher.Vehicle weight often alleviates 1%, and fuel consumption can reduce 0.6%-1.0%.Research shows, uses with orthodox car Advanced high-strength steel compares the aluminum content in steel when reaching 5-6wt% (percetage by weight), and auto parts and components can loss of weight 8-10%.By In the interpolation of a large amount of aluminium elements, making the density of steel significantly reduce, this kind of steel is referred to as high-strength light steel.
Considering to apply to high-strength light steel actual production, this patent controls manganese, aluminum content is below 6wt.%, and in order to Improving plasticity, suppression κ carbide brittlement phase separates out, and adds a small amount of ferrite former chromium, under appropriate process conditions not But make it possess orthodox car steel high-strength tenacity feature, realize low-density simultaneously, have huge in automotive material field Potential using value.
Summary of the invention
It is an object of the invention to provide the middle carbon of a kind of special composition containing chromium low manganese lightweight steel and preparation method thereof.This Bright another object is that by adding a small amount of chromium, in conjunction with cold roller and deformed process, obtains superelevation than strength and ductility product lightweight steel.
The present invention is realized by techniques below means and measure: carbon low manganese lightweight steel Han chromium in this high intensity, It is characterized in that weight percent consists of: C 0.20～0.40%, Al 4.0～6.0%, Mn 3.0～6.0%, Cr 0.2～ 1.5%, P < 0.02%, S < 0.01%, N < 0.004%, Fe surplus.
Carbon low manganese lightweight steel Han chromium in described high intensity, weight percent composition is chosen as: C0.25%, Al 4.5%, Mn 3.5%, Cr 0.2%, P 0.01%, S 0.008%, N 0.003%, Fe surplus.
Carbon low manganese lightweight steel Han chromium in described high intensity, weight percent composition is chosen as: C0.30%, Al 4.5%, Mn 4.0%, Cr 1.0%, P 0.01%, S 0.008%, N 0.003%, Fe surplus.
Carbon low manganese lightweight steel Han chromium in described high intensity, weight percent composition is chosen as: C0.30%, Al 5.0%, Mn 5.5%, Cr 1.0%, P 0.01%, S 0.008%, N 0.003%, Fe surplus.
Carbon low manganese lightweight steel Han chromium in described high intensity, weight percent composition is chosen as: C0.35%, Al 5.5%, Mn 5.5%, Cr 1.5%, P 0.01%, S 0.008%, N 0.003%, Fe surplus.
The described middle carbon preparation method containing chromium low manganese lightweight steel, comprises the steps:
A, smelting the steel billet of said components in vaccum sensitive stove, in smelting process, applying argon gas protection, then molds；
After B, the demoulding, ingot casting is heated to 1200 DEG C, carries out hot rolling after being incubated 1 hour, and the breaking down temperature of hot rolling controls 1050～1150 DEG C, finishing temperature control is at 850～1000 DEG C, and after being hot-rolled down to 3mm, air cooling is to room temperature；
C, by the cold-rolling of steel plate after hot rolling, be cold-rolled to 1.2mm, the steel plate after cold rolling be heated to 790～820 DEG C of insulations Quickly it is incubated 3min to cooling 400 DEG C after 1min and obtains the strength and ductility product lightweight steel more than 30GPa%.
The technological progress effect of the present invention shows: add substantial amounts of aluminum in steel as lighting element, close for material The reducing effect of degree is fairly obvious；Add a small amount of chromium suppression brittlement phase to separate out, hence it is evident that improve the plasticity of material；Through moving back continuously After fire processes, lightweight steel is ferrite and austenite two-phase structure, under plus load effect, and austenite generation strain-induced horse Family name's body changes (TRIP effect), thus effectively raises tensile strength and elongation percentage, it is thus achieved that strength and ductility product is light more than 30GPa%'s Matter steel.
Detailed description of the invention
Embodiment 1:
Wherein technical process and step are as follows:
Smelting the steel billet of said components in vaccum sensitive stove, in smelting process, applying argon gas protection, then molds；De- After mould, ingot casting is heated to 1200 DEG C, carries out hot rolling after being incubated 1 hour, and the breaking down temperature of hot rolling controls at 1000 DEG C, finishing temperature Controlling at 900 DEG C, after being hot-rolled down to 3mm, air cooling is to room temperature；Cold-rolling of steel plate after hot rolling is cold-rolled to 1.2mm, cold-reduced sheet is heated Be quickly cooled to 400 DEG C of insulation 3min obtaining tensile strength to 820 DEG C of insulation 1min is 783MPa, and elongation percentage is 40%, by force Mould and amass the lightweight steel into 31.3GPa%.
Detecting through instrument, this steel is the duplex structure of ferrite and austenite composition.
After instrument test, different temperatures annealing, the every mechanical properties value of cold-rolled steel sheet is as follows:
The static mechanical property of this steel grade after the annealing of table 1 different temperatures
Embodiment 2:
Wherein technical process and step are as follows:
Smelting the steel billet of said components in vaccum sensitive stove, in smelting process, applying argon gas protection, then molds；De- After mould, ingot casting is heated to 1200 DEG C, carries out hot rolling after being incubated 1 hour, and the breaking down temperature of hot rolling controls at 1000 DEG C, finishing temperature Controlling at 900 DEG C, after being hot-rolled down to 3mm, air cooling is to room temperature；Cold-rolling of steel plate after hot rolling is cold-rolled to 1.2mm, cold-reduced sheet is heated Be quickly cooled to 400 DEG C of insulation 3min obtaining tensile strength to 820 DEG C of insulation 1min is 772MPa, and elongation percentage is 41%, by force Mould and amass the lightweight steel into 31.7GPa%.
Detecting through instrument, this steel is the duplex structure of ferrite and austenite composition.
After instrument test, different temperatures annealing, the every mechanical properties value of cold-rolled steel sheet is as follows:
The static mechanical property of this steel grade after the annealing of table 2 different temperatures
Embodiment 3:
Wherein technical process and step are as follows:
Smelting the steel billet of said components in vaccum sensitive stove, in smelting process, applying argon gas protection, then molds；De- After mould, ingot casting is heated to 1200 DEG C, carries out hot rolling after being incubated 1 hour, and the breaking down temperature of hot rolling controls at 1000 DEG C, finishing temperature Controlling at 900 DEG C, after being hot-rolled down to 3mm, air cooling is to room temperature；Cold-rolling of steel plate after hot rolling is cold-rolled to 1.2mm, cold-reduced sheet is heated Quickly obtaining tensile strength to cooling 400 DEG C insulation 3min to 790 DEG C of insulation 1min is 724MPa, and elongation percentage is 44%, by force Mould and amass the lightweight steel into 31.9GPa%.
Detecting through instrument, this steel is the duplex structure of ferrite and austenite composition.
After instrument test, different temperatures annealing, the every mechanical properties value of cold-rolled steel sheet is as follows:
The static mechanical property of this steel grade after the annealing of table 3 different temperatures
Embodiment 4:
Wherein technical process and step are as follows:
Smelting the steel billet of said components in vaccum sensitive stove, in smelting process, applying argon gas protection, then molds；De- After mould, ingot casting is heated to 1200 DEG C, carries out hot rolling after being incubated 1 hour, and the breaking down temperature of hot rolling controls at 1000 DEG C, finishing temperature Controlling at 900 DEG C, after being hot-rolled down to 3mm, air cooling is to room temperature；Cold-rolling of steel plate after hot rolling is cold-rolled to 1.2mm, cold-reduced sheet is heated Be quickly cooled to 400 DEG C of insulation 3min obtaining tensile strength to 790 DEG C of insulation 1min is 717MPa, and elongation percentage is 45%, by force Mould and amass the lightweight steel into 32.3GPa%.
Detecting through instrument, this steel is the duplex structure of ferrite and austenite composition.
After instrument test, different temperatures annealing, the every mechanical properties value of cold-rolled steel sheet is as follows:
The static mechanical property of this steel grade after the annealing of table 4 different temperatures
Measure the density of each steel in this patent, and by its tensile strength, elongation percentage and than strength and ductility product with the most other kinds of Automobile high-strength steel compares as shown in table 5.
This steel of table 5 and same level high-strength steel performance comparison
It can be seen that compared with the high-strength steel of same intensity rank, middle carbon low manganese lightweight Han chromium that the inventive method prepares Steel has the ratio strength and ductility product of excellence.

Claims (6)

1. carbon low manganese lightweight steel Han chromium in a high intensity, it is characterised in that weight percent consists of: C 0.20～0.40%, Al 4.0～6.0%, Mn 3.0～6.0%, Cr 0.2～1.5%, P < 0.02%, S < 0.01%, N < 0.004%, Fe surplus.
Carbon low manganese lightweight steel Han chromium in high intensity the most according to claim 1, it is characterised in that weight percent composition selects For: C 0.25%, Al 4.5%, Mn 3.5%, Cr 0.2%, P 0.01%, S 0.008%, N 0.003%, Fe surplus.
Carbon low manganese lightweight steel Han chromium in high intensity the most according to claim 1, it is characterised in that weight percent composition selects For: C 0.30%, Al 4.5%, Mn 4.0%, Cr 1.0%, P 0.01%, S 0.008%, N 0.003%, Fe surplus.
Carbon low manganese lightweight steel Han chromium in high intensity the most according to claim 1, it is characterised in that weight percent composition selects For: C 0.30%, Al 5.0%, Mn 5.5%, Cr 1.0%, P 0.01%, S 0.008%, N 0.003%, Fe surplus.
Carbon low manganese lightweight steel Han chromium in high intensity the most according to claim 1, it is characterised in that weight percent composition selects For: C 0.35%, Al 5.5%, Mn 5.5%, Cr 1.5%, P 0.01%, S 0.008%, N 0.003%, Fe surplus.
The middle carbon the most according to claim 1 preparation method containing chromium low manganese lightweight steel, comprises the steps:
A, smelting the steel billet of said components in vaccum sensitive stove, in smelting process, applying argon gas protection, then molds；
After B, the demoulding, ingot casting is heated to 1200 DEG C, carries out hot rolling after being incubated 1 hour, the breaking down temperature of hot rolling control 1050～ 1150 DEG C, finishing temperature control is at 850～1000 DEG C, and after being hot-rolled down to 3mm, air cooling is to room temperature；
C, by the cold-rolling of steel plate after hot rolling, be cold-rolled to 1.2mm, after the steel plate after cold rolling is heated to 790～820 DEG C of insulation 1min Quickly it is incubated 3min to cooling 400 DEG C and obtains the strength and ductility product lightweight steel more than 30GPa%.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020032446A1 (en) * 2018-08-07 2020-02-13 주식회사 포스코 Low-specific-gravity clad steel sheet having excellent strength and plateability, and manufacturing method therefor
CN112729376A (en) * 2020-11-27 2021-04-30 成都先进金属材料产业技术研究院有限公司 Method for evaluating hot working performance of light high-strength steel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101660086A (en) * 2008-08-25 2010-03-03 鞍钢股份有限公司 Light and high-performance twin crystal inducing plasticity steel and preparation method thereof
CN102312157A (en) * 2011-09-21 2012-01-11 首钢总公司 Cold-rolled TRIP steel at over 1000 MPa and preparation method thereof
JP2013076160A (en) * 2011-09-15 2013-04-25 Nisshin Steel Co Ltd Steel sheet for rotor core of ipm motor excellent in punching property, method for manufacturing the same, rotor core of ipm motor, and ipm motor
CN104694816A (en) * 2015-03-13 2015-06-10 北京科技大学 Preparation method of high-Al medium manganese steel with strength and ductility product exceeding 30GPa%
CN104928456A (en) * 2015-06-30 2015-09-23 宝山钢铁股份有限公司 Manufacturing method for improving extensibility of commonly-cooled ferrite lightweight steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101660086A (en) * 2008-08-25 2010-03-03 鞍钢股份有限公司 Light and high-performance twin crystal inducing plasticity steel and preparation method thereof
JP2013076160A (en) * 2011-09-15 2013-04-25 Nisshin Steel Co Ltd Steel sheet for rotor core of ipm motor excellent in punching property, method for manufacturing the same, rotor core of ipm motor, and ipm motor
CN102312157A (en) * 2011-09-21 2012-01-11 首钢总公司 Cold-rolled TRIP steel at over 1000 MPa and preparation method thereof
CN104694816A (en) * 2015-03-13 2015-06-10 北京科技大学 Preparation method of high-Al medium manganese steel with strength and ductility product exceeding 30GPa%
CN104928456A (en) * 2015-06-30 2015-09-23 宝山钢铁股份有限公司 Manufacturing method for improving extensibility of commonly-cooled ferrite lightweight steel

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
S.J.PARK ET AL.: "Microstructure and tensile behavior of duplex low-density steel containing 5 mass% aluminum", 《SCRIPTA MATERIALIA》 *
鞠鲁粤: "《工程材料与成形技术基础》", 31 March 2015, 高等教育出版社 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020032446A1 (en) * 2018-08-07 2020-02-13 주식회사 포스코 Low-specific-gravity clad steel sheet having excellent strength and plateability, and manufacturing method therefor
CN112368145A (en) * 2018-08-07 2021-02-12 Posco公司 Low-ratio-repeat steel sheet excellent in strength and plating properties, and method for producing same
US11913089B2 (en) 2018-08-07 2024-02-27 Posco Co., Ltd Low-density clad steel sheet having excellent strength and plateability, and manufacturing method therefor
CN112729376A (en) * 2020-11-27 2021-04-30 成都先进金属材料产业技术研究院有限公司 Method for evaluating hot working performance of light high-strength steel

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