CN105755370A - Ultralow-carbon cold-rolled steel plate and production method thereof - Google Patents

Ultralow-carbon cold-rolled steel plate and production method thereof Download PDF

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Publication number
CN105755370A
CN105755370A CN201610346035.XA CN201610346035A CN105755370A CN 105755370 A CN105755370 A CN 105755370A CN 201610346035 A CN201610346035 A CN 201610346035A CN 105755370 A CN105755370 A CN 105755370A
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CN
China
Prior art keywords
steel plate
rolling
rolled steel
carbon cold
ultralow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610346035.XA
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Chinese (zh)
Inventor
王敏莉
郑之旺
余灿生
张功庭
赵国英
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Publication date
Application filed by Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd filed Critical Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Priority to CN201610346035.XA priority Critical patent/CN105755370A/en
Publication of CN105755370A publication Critical patent/CN105755370A/en
Pending legal-status Critical Current

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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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical 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 discloses an ultralow-carbon cold-rolled steel plate. The ultralow-carbon cold-rolled steel plate comprises the following components in percentage by weight: 0.001 to 0.002 percent of C, less than or equal to 0.03 percent of Si, 0.10 to 0.20 percent of Mn, 0.005 to 0.020 percent of P, 0.005 to 0.010 percent of S, 0.045 to 0.085 percent of Ti, 0.020 to 0.070 percent of Als, and the balance of Fe and unavoidable impurities. The invention further discloses a production method for the ultralow-carbon cold-rolled steel plate. The ultralow-carbon cold-rolled steel plate is high in adaptability; the surface quality of the product is good. The mechanical properties of a finished product meet the requirements that the yield strength is between 120 and 140 MPa, the tensile strength is between 280 and 310 MPa, the elongation is greater than or equal to 46.0 percent, r90 is greater than or equal to 3.0, and n90 is greater than or equal to 0.26.

Description

A kind of ultralow carbon cold-rolled steel plate and production method thereof
Technical field
The present invention relates to a kind of steel plate and production method thereof, be specifically related to a kind of ultralow carbon cold-rolled steel plate and production method thereof, belong to cold rolled sheet production technical field.
Background technology
Along with the development of automobile industry, the requirement of household electrical appliances plate is improved constantly by market, and under the premise ensureing performance, punch forming performance gradually steps up.
Continuous annealing produces the representational patent of cold-rolled steel sheet following 2:
The continuous annealing process of (1) 200910029806.2 deep-draw and extra deep drawing sheet steel
The invention discloses the continuous annealing process of a kind of deep-draw and extra deep drawing sheet steel; steel plate passes through before annealing and cleans; enter continuous annealing furnace; speed 150～350m/min; adopt nitrogen hydrogen mixeding gas ejection surface of steel plate; steel plate is protected from oxidation, makes steel billet temperature heat to 120～180 DEG C simultaneously；Again steel plate is heated so that it is temperature reaches 750～780 DEG C, and is incubated 40～70s；Then steel plate is cooled to 400～460 DEG C, and is incubated 60～300s and carries out Wetted constructures, be then cooled to room temperature.Owing to adopting overaging annealing process, the carbide in steel is made fully to be precipitated out, it is ensured that household electrical appliances steel plate and Automobile Plate punching performance and ultra-deep punching performance.
(2) 201110052830.5 low temperature continuous annealing gap-free atom cold-rolled steel sheet and production methods thereof
The invention discloses the production method of a kind of low temperature continuous annealing gap-free atom cold-rolled steel sheet, containing C:0.0005～0.0025%, Si :≤0.030%, Mn:0.05～0.15%, P≤0.015%, S≤0.010%, O≤0.025%, N :≤0.0025%, Al:0.015～0.050%, Ti:0.03～0.07%.All the other are by Fe and trace element.Even moving back temperature is 710～740 DEG C, cold rolling reduction ratio >=80%.By adopting rational chemical composition and suitable cold rolling reduction ratio, reducing recrystallization temperature and form sufficient cold rolling heterogeneous microstructure, it is possible to adapting to relatively low continuous annealing temperature, thus reducing cost and production difficulty.
Summary of the invention
It is an object of the invention on the basis of existing technology, it is provided that a kind of function admirable ultralow carbon cold-rolled steel plate that can realize batch production on continuous annealing unit and production method thereof.Finished product mechanical property reaches yield strength 120～140MPa, tensile strength 280～310MPa, percentage elongation >=46.0%, r90 >=3.0, the requirement of n90 >=0.26.
The present invention is achieved in that
A kind of ultralow carbon cold-rolled steel plate, the percentage by weight of constituent is: C:0.001～0.002%, Si :≤0.03%, Mn:0.10～0.20%, P:0.005～0.020%, S:0.005～0.010%, Ti:0.045～0.085%, Als:0.020%～0.070%, surplus is Fe and inevitable impurity composition.
A kind of production method of ultralow carbon cold-rolled steel plate, including:
By usual desulfurizing iron, converter smelting, LF stove Ca process, RH decarburization, molten steel composition is controlled in above-mentioned scope, it is casting continuously to form continuous casting billet, heats to 1220 DEG C～1250 DEG C, time inside furnace 200～300min, carrying out roughing, roughing adopts 5 passes, the 5 total dephosphorization of passage.Hot rolling intermediate slab thickness is at 48mm～50mm, and hot rolling is close to about 950 DEG C finish to gauges, and to ensure that hot rolling obtains tiny tissue, finish rolling start rolling temperature 1020 DEG C～1070 DEG C, finishing temperature ranges for 920 DEG C～950 DEG C；It is cooled to 740～770 DEG C in the section cooling mode of leading portion cooling after finish rolling batch.Thickness 3～the 6mm of hot rolled plate.Hot rolled plate is after alkali cleaning cleans up, in the ability in conjunction with cold-rolling mill, it is determined that for cold rolling reduction ratio 80%～87%.Rolling up the unit speed at continuous annealing furnace after rolling is 140～180m/min, and steel plate is heated to respectively 790～820 DEG C and 840-860 DEG C in bringing-up section and soaking zone；The belt steel temperature terminated in the slow cooling terminal of continuous annealing furnace, rapid cooling terminal, overaging controls respectively at 670～700 DEG C, 430～460 DEG C and 400-430 DEG C；Through water liquid bath, strip steel being cooled to room temperature, carries out finishing, elongation control is 0.4～0.6%.
The present invention compared with prior art, has following beneficial effect:
(1) present invention defines the key technology producing ultralow carbon cold-rolled steel plate on continuous annealing unit.
(2) adaptability of the present invention is relatively strong, and product surface quality is excellent.Finished product mechanical property reaches yield strength 120～140MPa, tensile strength 280～310MPa, percentage elongation >=46.0%, r90 >=3.0, the requirement of n90 >=0.26.
Detailed description of the invention
Below in conjunction with embodiments of the invention, the invention will be further elaborated.
By usual desulfurizing iron, converter smelting, LF stove Ca process, RH decarburization, the continuous casting billet being casting continuously to form, chemical composition is C:0.001%, Si:0.01%, Mn:0.11%, P:0.007%, S:0.007%, Ti:0.070%, Al:0.031%, surplus is Fe and inevitable impurity composition.Heating of plate blank to 1236 DEG C carries out roughing, time inside furnace 260min, and after roughing, intermediate slab thickness is at 48.5mm, finish rolling start rolling temperature 1061 DEG C, and finishing temperature is 936 DEG C, and degree of batching is 757 DEG C, the thickness 5.0mm of hot rolled plate.Cold rolling reduction ratio is 84.0%, and Cold Rolled Plate Thickness is 0.8mm.Rolling up the unit speed at continuous annealing furnace after rolling is 148m/min, in bringing-up section and soaking zone, steel plate is heated to 795 DEG C and 855 DEG C respectively；The belt steel temperature terminated in the slow cooling terminal of continuous annealing furnace, rapid cooling terminal, overaging controls respectively at 680 DEG C, 445 DEG C and 418 DEG C；Finishing elongation control is 0.42%.
Ultralow carbon cold-rolled steel plate prepared by the present invention, it is possible to have intensity low, percentage elongation is high, and n value and r value are higher, have good forming property, its yield strength, tensile strength, percentage elongation, n90, r90 respectively 125MPa, 284MPa, 48.5,0.28,3.7.
Although reference be made herein to invention has been described for the explanatory embodiment of the present invention, above-described embodiment is only the present invention preferably embodiment, embodiments of the present invention are also not restricted to the described embodiments, should be appreciated that, those skilled in the art can be designed that a lot of other amendments and embodiment, and these amendments and embodiment will drop within spirit disclosed in the present application and spirit.

Claims (2)

1. a ultralow carbon cold-rolled steel plate, it is characterized in that: the percentage by weight of described ultralow carbon cold-rolled steel plate constituent is: C:0.001～0.002%, Si :≤0.03%, Mn:0.10～0.20%, P:0.005～0.020%, S:0.005～0.010%, Ti:0.045～0.085%, Als:0.020%～0.070%, surplus is Fe and inevitable impurity composition.
2. the production method of ultralow carbon cold-rolled steel plate described in claim 1, it is characterised in that including:
By usual desulfurizing iron, converter smelting, LF stove Ca process, RH decarburization, molten steel composition is controlled within the scope of the constituent of ultralow carbon cold-rolled steel plate described in claim 1, it is casting continuously to form continuous casting billet, heat to 1220 DEG C～1250 DEG C, time inside furnace 200～300min, carry out roughing, roughing adopts 5 passes, the 5 total dephosphorization of passage；Hot rolling intermediate slab thickness is at 48mm～50mm, hot rolling is in the austenitic area finish to gauge close to Ar3 (austenite to the temperature of ferritic transformation), to ensure that hot rolling obtains tiny tissue, finish rolling start rolling temperature 1020 DEG C～1070 DEG C, finishing temperature ranges for 920 DEG C～950 DEG C；It is cooled to 740～770 DEG C in the section cooling mode of leading portion cooling after finish rolling batch；Thickness 3～the 6mm of hot rolled plate；Hot rolled plate is after alkali cleaning cleans up, in the ability in conjunction with cold-rolling mill, it is determined that be 80%～87%；Rolling up the unit speed at continuous annealing furnace after rolling is 140～180m/min, and steel plate is heated to respectively 790～820 DEG C and 840-860 DEG C in bringing-up section and soaking zone；The belt steel temperature terminated in the slow cooling terminal of continuous annealing furnace, rapid cooling terminal, overaging controls respectively at 670～700 DEG C, 430～460 DEG C and 400-430 DEG C；Through water liquid bath, strip steel being cooled to room temperature, carries out finishing, elongation control is 0.4～0.6%.
CN201610346035.XA 2016-05-23 2016-05-23 Ultralow-carbon cold-rolled steel plate and production method thereof Pending CN105755370A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107413848A (en) * 2017-07-29 2017-12-01 华北理工大学 A kind of preparation method of cold-rolled steel sheet
CN112143978A (en) * 2020-09-27 2020-12-29 攀钢集团研究院有限公司 Method for manufacturing ultra-low carbon hot-dip galvanized steel sheet
CN112281056A (en) * 2020-09-23 2021-01-29 攀钢集团研究院有限公司 Preparation method of high-plasticity cold-rolled steel plate

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104611534A (en) * 2015-02-06 2015-05-13 攀钢集团攀枝花钢铁研究院有限公司 Ultra-low carbon cold-roll steel sheet and preparation method thereof
CN104694817A (en) * 2015-03-26 2015-06-10 攀钢集团西昌钢钒有限公司 Ultralow carbon cold-roll steel sheet production method
CN104745935A (en) * 2015-03-26 2015-07-01 攀钢集团西昌钢钒有限公司 Production method for cold-rolled steel sheet with excellent stamping property
CN105239001A (en) * 2015-11-11 2016-01-13 攀钢集团攀枝花钢铁研究院有限公司 Cold-roll steel plate used for oil heater and manufacture method of cold-roll steel plate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104611534A (en) * 2015-02-06 2015-05-13 攀钢集团攀枝花钢铁研究院有限公司 Ultra-low carbon cold-roll steel sheet and preparation method thereof
CN104694817A (en) * 2015-03-26 2015-06-10 攀钢集团西昌钢钒有限公司 Ultralow carbon cold-roll steel sheet production method
CN104745935A (en) * 2015-03-26 2015-07-01 攀钢集团西昌钢钒有限公司 Production method for cold-rolled steel sheet with excellent stamping property
CN105239001A (en) * 2015-11-11 2016-01-13 攀钢集团攀枝花钢铁研究院有限公司 Cold-roll steel plate used for oil heater and manufacture method of cold-roll steel plate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107413848A (en) * 2017-07-29 2017-12-01 华北理工大学 A kind of preparation method of cold-rolled steel sheet
CN112281056A (en) * 2020-09-23 2021-01-29 攀钢集团研究院有限公司 Preparation method of high-plasticity cold-rolled steel plate
CN112143978A (en) * 2020-09-27 2020-12-29 攀钢集团研究院有限公司 Method for manufacturing ultra-low carbon hot-dip galvanized steel sheet

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Application publication date: 20160713