CN108546881A - A kind of preparation method of no yield point elongation cold rolling medium managese steel strip - Google Patents

A kind of preparation method of no yield point elongation cold rolling medium managese steel strip Download PDF

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Publication number
CN108546881A
CN108546881A CN201810465215.9A CN201810465215A CN108546881A CN 108546881 A CN108546881 A CN 108546881A CN 201810465215 A CN201810465215 A CN 201810465215A CN 108546881 A CN108546881 A CN 108546881A
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cold rolling
medium managese
yield point
point elongation
steel strip
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CN201810465215.9A
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CN108546881B (en
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袁国
王鹤松
康健
曹光明
李成刚
张元祥
王国栋
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Northeastern University China
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Northeastern University China
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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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold 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
    • C22C38/06—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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention belongs to steel alloy material technical fields, and in particular to a kind of preparation method of no yield point elongation cold rolling medium managese steel strip.Technical scheme is as follows：A kind of preparation method of no yield point elongation cold rolling medium managese steel strip, includes the following steps：(1) melting molten steel；(2) tundish is poured into；(3) Bu Liubao is poured into；(4) twin-roll thin strip continuous casting equipment casting is utilized；(5) Cast Strip a time hot rolling crimps after air-cooled；(6) hot rolled coil reverse transformation is annealed；(7) cold rolling after pickling；(8) cold-reduced sheet reverse transformation is annealed.The preparation method of no yield point elongation cold rolling medium managese steel strip provided by the invention, prepare no yield point elongation cold rolling medium managese steel strip causes finished product plank apparent buckling phenomena occur to solve the problems, such as that the deformation of cold rolling medium managese steel is susceptible to luders band, and solves the problems such as cold rolling medium managese steel conventional manufacturing procedures are long, of high cost and energy consumption is big.

Description

A kind of preparation method of no yield point elongation cold rolling medium managese steel strip
Technical field
The invention belongs to steel alloy material technical fields, and in particular to a kind of no yield point elongation cold rolling medium managese steel strip Preparation method.
Background technology
Energy-saving and emission-reduction mitigate car weight and improve the main target that Crash Safety Design of Vehicles is current China Automobile Industry, vapour Automobile-used steel has become important development trend to high intensity development.There is advanced high-strength steel excellent intensity and plasticity to match (i.e. strength and ductility product), while mitigating vehicle weight, it is ensured that Crash Safety Design of Vehicles energy.The advanced high-strength steel of the first generation it is strong Modeling product relatively low (≤25GPa%) includes mainly the steel grades such as dual phase steel, gapless atomic steel and phase change induction plasticity steel；The second generation Advanced high-strength steel has higher strength and ductility product (40~70GPa%), includes mainly potassium steel.Since the advanced high-strength steel of the second generation adds Add more alloying element, such as manganese, causes production cost higher.Therefore the advanced high-strength steel of the third generation is urgently developed, is recognized at present It is a kind of advanced high-strength steel of the third generation of great potential for medium managese steel.The mass fraction of manganese ranging from 3%~12% in medium managese steel, By reverse transformation annealing process, ferrite and austenite structure can be obtained.Ranging from the 20% of austenite content in medium managese steel ~60%, medium managese steel has higher strength and ductility product (25~60GPa%).
However, have now been found that cold rolling medium managese steel will appear long luders band phenomenon, Lv De in drawing process This band can reduce medium managese steel plank in the surface quality of machine-shaping process, and finished product plank is caused apparent buckling phenomena occur, The use of user is influenced, therefore the problem becomes the obstruction of cold rolling medium managese steel application, it would be highly desirable to carry out without manganese in yield point elongation cold rolling The exploitation of steel product.In addition, the conventional manufacturing procedures of the medium managese steel of cold rolling at present are longer, after smelting continuous casting, need to carry out strand High-temperature homogenization processing, it usually needs be heated to 1200~1250 DEG C of heat preservation long periods, then carry out roughing and finish rolling Journey to obtain hot rolled plate, then carries out subsequent pickling, cold rolling and annealing process flow.This conventional manufacturing procedures can not only Consumption is big, and production procedure is longer, and manufacturing cost is relatively high.
Invention content
The present invention provides a kind of preparation method of no yield point elongation cold rolling medium managese steel strip, prepares no yield point elongation cold rolling Medium managese steel strip, which is susceptible to luders band to solve the deformation of cold rolling medium managese steel, causes finished product plank apparent buckling phenomena occur The problem of, and solve the problems such as cold rolling medium managese steel conventional manufacturing procedures are long, of high cost and energy consumption is big.
Technical scheme is as follows：
A kind of preparation method of no yield point elongation cold rolling medium managese steel strip, includes the following steps：
(1) melting molten steel, molten steel composition are by mass percentage：C 0.1~0.4%, Mn3~10%, Si ＜ 2%, Al ＜ 3%, S<0.002%, P<0.002%, O<0.002%, N<0.003%, surplus Fe；
(2) and then by molten steel it is poured into tundish, then is poured into Bu Liubao from tundish, finally poured into from Bu Liubao double In roll thin-belt continuous casting equipment, the Cast Strip that thickness is 1.5~3.0mm is obtained through casting；
(3) Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling, start rolling temperature is 1000~1250 DEG C, and hot rolling is total Drafts is 10%~30%, and finishing temperature is 900~1150 DEG C, and 300~500 DEG C are air-cooled to after hot rolling and is crimped, is obtained Hot rolled plate；
(4) hot rolled plate is heated to 600~800 DEG C of heat preservation 30min~8h, completes reverse transformation annealing, obtained reverse transformation and move back The hot rolled plate of fire；
(5) the hot rolled plate pickling of reverse transformation annealing is removed into iron scale, then carries out cold rolling, cold rolling overall reduction is 10 ~27%, obtain cold-reduced sheet；
(6) cold-reduced sheet is heated to 600~800 DEG C of heat preservation 1min~12min, completes reverse transformation annealing, then be air-cooled to room Temperature is obtained without yield point elongation cold rolling medium managese steel strip, and thickness is 0.75~1.9mm.
The preparation method without yield point elongation cold rolling medium managese steel strip, preferred embodiment are the cold-reduced sheet anti-phase Change annealing time is 1min~12min.
The preparation method without yield point elongation cold rolling medium managese steel strip, preferred embodiment are the no yield point elongation The tissue of cold rolling medium managese steel strip includes lath columnar ferrite and lath-shaped austenite.
The preparation method without yield point elongation cold rolling medium managese steel strip, preferred embodiment are the no yield point elongation Engineering stress-strain curve of cold rolling medium managese steel strip has the characteristics that continuously to surrender, and tensile strength is 700~1400MPa, Elongation after fracture is 20~60%.
Beneficial effects of the present invention are：The preparation process without yield point elongation cold rolling medium managese steel strip of the present invention is utilized double Molten steel casting is directly eliminated traditional strip production technology by roll thin-belt continuous casting technology at the Cast Strip that thickness is 1.5~3.0mm The production equipments such as conticaster, heating strand stove, roughing and mm finishing mill unit, significantly shorten the entire production procedure of strip, therefore, Energy consumption and production cost can effectively be reduced.
Specific implementation mode
In specific implementation process, molten steel of the invention is poured into from Bu Liubao in twin-roll thin strip continuous casting equipment, is by cloth stream Molten steel in packet pours into formation molten bath in the cavity of two opposite casting rolls of direction of rotation and side seal board composition, and molten steel is through casting roll Roll gap is solidified and is exported.
Tensile strength and the test accepted standard of elongation after fracture are GB/T228.1-2010 in the embodiment of the present invention, are drawn The gauge length for stretching sample is 25mm, is tested at room temperature, rate of extension 2mm/min.
Embodiment 1
Melting molten steel, ingredient are containing C 0.23%, Mn 4%, Si 0.5%, Al 2%, S by mass percentage 0.001%, P 0.0012%, O 0.002%, N 0.001%, surplus Fe；Then molten steel is poured into tundish, then from Tundish pours into Bu Liubao, is finally poured into twin-roll thin strip continuous casting equipment from Bu Liubao, and it is 2.0mm's to obtain thickness through casting Cast Strip；
Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling, start rolling temperature is 1250 DEG C, and hot rolling overall reduction is 20%, finishing temperature is 1150 DEG C, and 400 DEG C are air-cooled to after hot rolling and is crimped, hot rolled plate is obtained；
Hot rolled plate is heated to 700 DEG C of heat preservation 60min, reverse transformation annealing is completed, obtains the hot rolled plate of reverse transformation annealing；
The hot rolled plate pickling of reverse transformation annealing is removed into iron scale, then carries out cold rolling, cold rolling overall reduction is 20%, Obtain cold-reduced sheet；
Cold-reduced sheet is heated to 700 DEG C of heat preservation 5min, reverse transformation annealing is completed, then be air-cooled to room temperature, obtains flat without surrender Platform cold rolling medium managese steel strip, thickness 1.28mm, tensile strength 1050MPa, elongation after fracture 48% are organized by lath Columnar ferrite and lath-shaped austenitic structure composition.
Embodiment 2
Melting molten steel, ingredient are containing C 0.1%, Mn 10%, Si 0.5%, Al 1%, S by mass percentage 0.002%, P 0.002%, O 0.001%, N 0.003%, surplus Fe；Then molten steel is poured into tundish, then from Tundish pours into Bu Liubao, is finally poured into twin-roll thin strip continuous casting equipment from Bu Liubao, and it is 3.0mm's to obtain thickness through casting Cast Strip；
Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling, start rolling temperature is 1120 DEG C, and hot rolling overall reduction is 30%, finishing temperature is 900 DEG C, and 500 DEG C are air-cooled to after hot rolling and is crimped, hot rolled plate is obtained；
Hot rolled plate is heated to 600 DEG C of heat preservation 8h, reverse transformation annealing is completed, obtains the hot rolled plate of reverse transformation annealing；
The hot rolled plate pickling of reverse transformation annealing is removed into iron scale, then carries out cold rolling, cold rolling overall reduction is 10%, Obtain cold-reduced sheet；
Cold-reduced sheet is heated to 600 DEG C of heat preservation 12min, reverse transformation annealing is completed, then be air-cooled to room temperature, obtains flat without surrender Platform cold rolling medium managese steel strip, thickness 1.9mm, tensile strength 1400MPa, elongation after fracture 20% are organized by lath Columnar ferrite and lath-shaped austenitic structure composition.
Embodiment 3
Melting molten steel, ingredient are containing C 0.2%, Mn 3%, Si 1%, Al 1%, S by mass percentage 0.001%, P 0.0013%, O 0.0012%, N 0.001%, surplus Fe；Then molten steel is poured into tundish, then It pours into Bu Liubao from tundish, is finally poured into twin-roll thin strip continuous casting equipment from Bu Liubao, it is 1.5mm to obtain thickness through casting Cast Strip；
Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling, start rolling temperature is 1000 DEG C, and hot rolling overall reduction is 30%, finishing temperature is 920 DEG C, and 300 DEG C are air-cooled to after hot rolling and is crimped, hot rolled plate is obtained；
Hot rolled plate is heated to 800 DEG C of heat preservation 30min, reverse transformation annealing is completed, obtains the hot rolled plate of reverse transformation annealing；
The hot rolled plate pickling of reverse transformation annealing is removed into iron scale, then carries out cold rolling, cold rolling overall reduction is 25%, Obtain cold-reduced sheet；
Cold-reduced sheet is heated to 800 DEG C of heat preservation 1min, reverse transformation annealing is completed, then be air-cooled to room temperature, obtains flat without surrender Platform cold rolling medium managese steel strip, thickness 0.75mm, tensile strength 700MPa, elongation after fracture 45% are organized by lath Columnar ferrite and lath-shaped austenitic structure composition.
Embodiment 4
Melting molten steel, ingredient are containing C 0.4%, Mn 9%, Si 2%, Al 3%, S by mass percentage 0.0012%, P 0.001%, O 0.002%, N 0.003%, surplus Fe；Then molten steel is poured into tundish, then from Tundish pours into Bu Liubao, is finally poured into twin-roll thin strip continuous casting equipment from Bu Liubao, and it is 2.2mm's to obtain thickness through casting Cast Strip；
Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling, start rolling temperature is 1140 DEG C, and hot rolling overall reduction is 15%, finishing temperature is 960 DEG C, and 430 DEG C are air-cooled to after hot rolling and is crimped, hot rolled plate is obtained；
Hot rolled plate is heated to 750 DEG C of heat preservation 5h, reverse transformation annealing is completed, obtains the hot rolled plate of reverse transformation annealing；
The hot rolled plate pickling of reverse transformation annealing is removed into iron scale, then carries out cold rolling, cold rolling overall reduction is 15%, Obtain cold-reduced sheet；
Cold-reduced sheet is heated to 720 DEG C of heat preservation 3min, reverse transformation annealing is completed, then be air-cooled to room temperature, obtains flat without surrender Platform cold rolling medium managese steel strip, thickness 1.6mm, tensile strength 900MPa, elongation after fracture 60% are organized by lath-shaped Ferrite and lath-shaped austenitic structure composition.

Claims (4)

1. a kind of preparation method of no yield point elongation cold rolling medium managese steel strip, which is characterized in that include the following steps：
(1) melting molten steel, molten steel composition are by mass percentage：C 0.1~0.4%, Mn 3~10%, Si ＜ 2%, Al ＜ 3%, S<0.002%, P<0.002%, O<0.002%, N<0.003%, surplus Fe；
(2) and then by molten steel it is poured into tundish, then is poured into Bu Liubao from tundish, it is thin finally to pour into double roller from Bu Liubao In band continuous casting installation for casting, the Cast Strip that thickness is 1.5~3.0mm is obtained through casting；
(3) Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling, start rolling temperature is 1000~1250 DEG C, under hot rolling stagnation pressure Amount is 10%~30%, and finishing temperature is 900~1150 DEG C, and 300~500 DEG C are air-cooled to after hot rolling and is crimped, hot rolling is obtained Plate；
(4) hot rolled plate is heated to 600~800 DEG C of heat preservation 30min~8h, completes reverse transformation annealing, obtain reverse transformation annealing Hot rolled plate；
(5) the hot rolled plate pickling of reverse transformation annealing being removed into iron scale, then carries out cold rolling, cold rolling overall reduction is 10~ 27%, obtain cold-reduced sheet；
(6) cold-reduced sheet is heated to 600~800 DEG C of heat preservation 1min~12min, completes reverse transformation annealing, then be air-cooled to room temperature, obtains It obtains without yield point elongation cold rolling medium managese steel strip, thickness is 0.75~1.9mm.
2. the preparation method of no yield point elongation cold rolling medium managese steel strip according to claim 1, which is characterized in that described cold It is 1min~12min to roll plate reverse transformation annealing time.
3. the preparation method of no yield point elongation cold rolling medium managese steel strip according to claim 1, which is characterized in that the nothing The tissue of yield point elongation cold rolling medium managese steel strip includes lath columnar ferrite and lath-shaped austenite.
4. the preparation method of no yield point elongation cold rolling medium managese steel strip according to claim 1, which is characterized in that the nothing Engineering stress-strain curve of yield point elongation cold rolling medium managese steel strip have the characteristics that continuously surrender, tensile strength be 700~ 1400MPa, elongation after fracture are 20~60%.
CN201810465215.9A 2018-05-16 2018-05-16 Preparation method of yield-platform-free cold-rolled medium manganese steel thin strip Active CN108546881B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110453146A (en) * 2019-08-21 2019-11-15 首钢集团有限公司 A kind of Cr alloying steel of no yield point elongation and preparation method thereof
CN114107623A (en) * 2021-12-01 2022-03-01 安徽工业大学 Heat treatment method for reducing aging property of SPHC hot rolled plate coil through online isothermal de-aging annealing
EP4019654A1 (en) * 2020-12-23 2022-06-29 Fundación Azterlan Low density medium alloyed steels with aluminium and manganese
CN115537677A (en) * 2022-09-29 2022-12-30 武汉科技大学 High-strength high-plasticity austenitic high-manganese steel with double-peak structure and production method thereof

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* Cited by examiner, † Cited by third party
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CN103357828A (en) * 2013-07-29 2013-10-23 东北大学 Casting system used for twin-roll thin strip continuous casting and use method thereof
US20150218684A1 (en) * 2012-07-27 2015-08-06 ThyssenKruppe Steel Europe AG Cold-Rolled Flat Steel Product and Method for the Production Thereof
CN106086640A (en) * 2016-06-21 2016-11-09 北京科技大学 Cold rolling medium managese steel that a kind of superhigh intensity plasticity is long-pending and preparation method thereof
CN106868399A (en) * 2017-03-08 2017-06-20 东北大学 A kind of two-phase TRIP steel strips and preparation method thereof
CN107858586A (en) * 2017-11-07 2018-03-30 东北大学 A kind of preparation method of high strength and ductility without yield point elongation cold rolling medium managese steel plate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150218684A1 (en) * 2012-07-27 2015-08-06 ThyssenKruppe Steel Europe AG Cold-Rolled Flat Steel Product and Method for the Production Thereof
CN103357828A (en) * 2013-07-29 2013-10-23 东北大学 Casting system used for twin-roll thin strip continuous casting and use method thereof
CN106086640A (en) * 2016-06-21 2016-11-09 北京科技大学 Cold rolling medium managese steel that a kind of superhigh intensity plasticity is long-pending and preparation method thereof
CN106868399A (en) * 2017-03-08 2017-06-20 东北大学 A kind of two-phase TRIP steel strips and preparation method thereof
CN107858586A (en) * 2017-11-07 2018-03-30 东北大学 A kind of preparation method of high strength and ductility without yield point elongation cold rolling medium managese steel plate

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110453146A (en) * 2019-08-21 2019-11-15 首钢集团有限公司 A kind of Cr alloying steel of no yield point elongation and preparation method thereof
CN110453146B (en) * 2019-08-21 2021-08-17 首钢集团有限公司 Cr alloyed steel without yield platform and preparation method thereof
EP4019654A1 (en) * 2020-12-23 2022-06-29 Fundación Azterlan Low density medium alloyed steels with aluminium and manganese
CN114107623A (en) * 2021-12-01 2022-03-01 安徽工业大学 Heat treatment method for reducing aging property of SPHC hot rolled plate coil through online isothermal de-aging annealing
CN114107623B (en) * 2021-12-01 2023-09-15 安徽工业大学 Heat treatment method for reducing timeliness of SPHC hot rolled plate coil by online isothermal aging removal annealing
CN115537677A (en) * 2022-09-29 2022-12-30 武汉科技大学 High-strength high-plasticity austenitic high-manganese steel with double-peak structure and production method thereof
CN115537677B (en) * 2022-09-29 2023-10-13 武汉科技大学 High-strength high-plasticity austenitic high-manganese steel with double-peak structure and production method thereof

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