CN106636907A - Thin gauge carriage body steel belt with yield strength of 600MPa, and manufacturing method of thin gauge carriage body steel belt - Google Patents

Thin gauge carriage body steel belt with yield strength of 600MPa, and manufacturing method of thin gauge carriage body steel belt Download PDF

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Publication number
CN106636907A
CN106636907A CN201611243220.2A CN201611243220A CN106636907A CN 106636907 A CN106636907 A CN 106636907A CN 201611243220 A CN201611243220 A CN 201611243220A CN 106636907 A CN106636907 A CN 106636907A
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CN
China
Prior art keywords
yield strength
steel band
temperature
rolling
steel belt
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Pending
Application number
CN201611243220.2A
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Chinese (zh)
Inventor
曹晓明
张秀飞
刘德勤
白海瑞
杨雄
郭冬青
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baotou Iron and Steel Group Co Ltd
Inner Mongolia Baotou Steel Union Co Ltd
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Baotou Iron and Steel Group Co Ltd
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Priority to CN201611243220.2A priority Critical patent/CN106636907A/en
Publication of CN106636907A publication Critical patent/CN106636907A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Abstract

The invention discloses a thin gauge carriage body steel belt with a yield strength of 600MPa. The thin gauge carriage body steel belt is prepared from the following chemical components by weight percent: 0.06-0.08% of C, less than or equal to 0.20% of Si, 1.5-1.7% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.10-0.04% of Alt, 0.025-0.035% of Nb, 0.08-0.10% of Ti and the balance of Fe and unavoidable impurities. The invention also discloses a manufacturing method of the thin gauge carriage body steel belt with the yield strength of 600MPa. The manufacturing method comprises the steps of converter steel making, ladle furnace (LF) refining, continuous casting, slab heating, rack rough rolling, rack finish rolling, laminar cooling and reeling. By adopting a low-carbon microalloy composition design, the obtained steel belt has good cold roll forming performance.

Description

Yield strength 600MPa level Thin Specs envelope steel band and its manufacture method
Technical field
The present invention relates to a kind of Hi-Stren steel technology, specifically, is related to a kind of thin rule of yield strength 600MPa level Lattice envelope steel band and its manufacture method
Background technology
With the fast development of domestic commercial vehicle industry, user is to mitigating vehicle weight, reducing oil consumption, improve automobile knot Component strength and security performance etc. are put forward higher requirement.High intensity, Thin Specs become the trend of envelope steel development, Motor vehicle body steel is mainly used to manufacture compartment of commercial vehicle etc., by adding Nb, Ti microalloy element, obtains extremely tiny Grain structure and precipitation strength, make steel obdurability obtain high matching, while with good processability and welding Performance.Thin Specs steel band (2.0~3.0mm) occupies larger market proportion in envelope steel, and market sales volume is preferable.
The patent document of Chinese publication number CN 103614625A discloses a kind of " 590MPa levels Hot Rolling Automobile envelope steel Plate ", the chemical composition of steel plate is C by weight percentage:0.12~0.14%, Si:0.20~0.30%, Mn:1.40~ 1.60%th, P:≤ 0.015%, S:≤ 0.010%, Nb:0.01~0.03%, Ti:0.07~0.10%, balance of Fe and can not The impurity for avoiding, its yield strength > 450MPa, tensile strength > 590MPa, the patent is not same with this patent armor plate strength Rank, this patent yield strength > 620MPa, tensile strength > 660MPa and the patent only elaborate the producer in laboratory Method.
The patent document of Chinese publication number CN 104561791A discloses " 800MPa rank boxlike component of automobile steel and its life Product method ", the mass percentage content of the slab for being adopted for:C:0.08~0.12%, Si:0.20~0.40%, Mn:1.40 ~1.60%, P≤0.025%, S≤0.010%, V:0.040~0.060%, Ti:0.090~0.120%, Als >= 0.015%th, N≤0.004%, remaining is Fe and inevitable impurity.The patent is not same with this patent armor plate strength Rank, and this patent does not contain V, and alloying system is different, and cost is lower.
The patent document of Chinese publication number CN 104141093A discloses " motor vehicle body use of the yield strength up to 700MPa Strip and its milling method ", chemical component weight percentage is:C:0.06~0.12%;Si:0.2~0.4%;V< 0.005%;Mn:0.5~1.6%;Ti:0.06~0.14%;Remaining is iron and other inevitable impurity.This patent is not contained V, the patent is different from this patent alloying system, and cost is lower.
But easily occur the bad problem of whipping and template in process of production in, existing envelope steel, production it is difficult compared with Greatly.
The content of the invention
Technical problem solved by the invention is to provide a kind of yield strength 600MPa level Thin Specs envelope steel band, with good Good cold roll forming performance.
Technical scheme is as follows:
A kind of yield strength 600MPa level Thin Specs envelope steel band, chemical composition includes by weight percentage:C:0.06~ 0.08%th, Si:≤ 0.20%, Mn:1.5~1.7%, P:≤ 0.020%, S:≤ 0.010%, Alt:0.10~0.04%, Nb: 0.025~0.035%, Ti:0.08~0.10%, balance of Fe and inevitable impurity.
Further:Si:0.10~0.20%, Mn:1.53~1.65%, P:0.012~0.015%, S:0.006~ 0.009%, Nb:0.025~0.033%, Ti:0.080~0.095%, Alt:0.02~0.04.
Another technical problem solved by the invention is to provide a kind of yield strength 600MPa level Thin Specs envelope steel band Manufacture method, steel band has good cold roll forming performance.
Technical scheme is as follows:
A kind of manufacture method of yield strength 600MPa level Thin Specs envelope steel band, including converter smelting, LF refining, company Casting, heating of plate blank, frame roughing, frame finish rolling, section cooling, batch;
In converter steelmaking process, bottom-blowing of converter is caused with reducing using whole Argon pattern, terminal hit at first time because re-blowing Molten steel nitrogen pick-up;The further deoxidation of LF refining, desulfurization, removal are mingled with, adjusting component and temperature, Argon intensity are controlled, according to early stage By force, the mid-term principle weak compared with the strong, later stage formulates Argon curve;
In heating process, at 1270 DEG C~1290 DEG C, the heat time controls in 180-240min heating and temperature control, it is ensured that The abundant solid solution of alloying element, plate slab temperature is uniform;
Rolling is rolled using two-stage control, single pass it is relative it is more than reduction ratio at least two passages more than 20%;Finish rolling Shi Yange controls each pass deformation, finish rolling start rolling temperature >=950 DEG C, and open rolling thickness is 37~42mm, finishing temperature 865-895 ℃;Roll rear steel band and enter laminar cooling system, 565-595 DEG C of coiling temperature;Obtain yield strength 600MPa level Thin Specs envelope Steel band, chemical composition includes by weight percentage:C:0.06~0.08%, Si:≤ 0.20%, Mn:1.5~1.7%, P:≤ 0.020%th, S:≤ 0.010%, Alt:0.10~0.04%, Nb:0.025~0.035%, Ti:0.08~0.10%, it is balance of Fe and inevitable impurity.
Further:In casting process, conticaster adopts straight circular-arc type continuous casting machine, using solidification end dynamic soft-reduction, dynamic Two refrigeration techniques, by constant temperature, permanent pulling rate technique.
Further:Steel band is that crystal grain is tiny and uniform ferrite+bainite structure.
Further:Slab thickness is 230mm after continuous casting, and thickness of strips is 2.5~3.0mm.
Compared with prior art, the technology of the present invention effect includes:
By low-carbon microalloyed composition design, obtain a kind of yield strength >=620MPa, tensile strength >=680Mpa, prolong Stretch rate >=14%, and the Thin Specs high-strength vehicle envelope steel band with good cold roll forming performance.
By adding Nb, Ti microalloy element, obtain extremely tiny grain structure and precipitation strength makes steel to the present invention Obdurability obtains high matching, while with good processability and welding performance.
It is contemplated that Thin Specs steel band (2.0~3.0mm) occupies larger market proportion, market pin in envelope steel Amount is preferable.Baogang's product structure can be lifted, considerable economic benefit is brought, it is contemplated that 200,000 yuan of economic benefit can be increased newly every year Left and right.
Description of the drawings
The metallographic structure figure of the steel plate of embodiment 3 during Fig. 1 is of the invention;
Steel plate width (double) cold-bending property (d=0) schematic diagram of embodiment 3 during Fig. 2 is of the invention.
Specific embodiment
Technical solution of the present invention is elaborated below with reference to example embodiment.However, example embodiment can Implement in a variety of forms, and be not understood as limited to embodiment set forth herein;Conversely, thesing embodiments are provided so that The design of example embodiment more comprehensively and completely, and is comprehensively conveyed to those skilled in the art by the present invention.
The manufacture method of yield strength 600MPa level Thin Specs envelope steel band, the technological process of employing is specifically included:Converter Smelting, LF refining, continuous casting, heating of plate blank, frame roughing, frame finish rolling, section cooling, batch.
Step 1:Smelt;
Using the molten iron through desulfurization pretreatment and high-quality steel scrap as raw material, bottom-blowing of converter adopts whole Argon pattern, Terminal hit at first time, to reduce molten steel nitrogen pick-up is caused because re-blowing.LF (ladle refining furnace) is refined, further deoxidation, desulfurization, removal Be mingled with, adjusting component and temperature, strictly to control Argon intensity, formulate according to the principle that early stage is strong, mid-term is weak compared with the strong, later stage and blow Argon curve, while deoxidation, deep desulfurization, alloying is ensured, reduces secondary oxidation and the nitrogen pick-up of refining process.
Step 2:Continuous casting;
Conticaster is straight circular-arc type continuous casting machine, using solidification end dynamic soft-reduction, the dynamic secondary cooling technology of optimization, by perseverance Temperature, permanent pulling rate technique, mitigate the defects such as continuous casting billet center segregation, center porosity, crackle, oscillation mark, and it is excellent that final production goes out 230mm thickness Matter continuous casting steel billet.
Step 3:Heating;
Plate slab is heated in heating furnace, fully ensures that plate slab heating-up temperature and soaking time.Heating and temperature control At 1270 DEG C~1290 DEG C, the heat time is controlled in 180-240min, it is ensured that the abundant solid solution of alloying element, plate slab temperature is equal It is even.
Step 4:Roll, cool down, batch.
Rolling is rolled using two-stage control, i.e. austenite recrystallization area controlled rolling (commonly referred to as rough rolling step) and Ovshinsky The non-recrystallization zone controlled rolling of body (commonly referred to as finish rolling stage).Roughing is carried out in R1 and R2 roughing mills, adopts " 3+3 " passage, slightly Increase pass deformation when rolling, single pass is with respect to more than reduction ratio at least two passages controlling more than 20%;Finish rolling is in F1-F7 Finishing mill is carried out, and each pass deformation, finish rolling start rolling temperature >=950 DEG C are strictly controlled during finish rolling, and open rolling thickness is 37~42mm, Finishing temperature 865-895 DEG C;Roll rear steel band and enter laminar cooling system, 565-595 DEG C of coiling temperature obtains crystal grain tiny and equal Even ferrite+bainite structure.
Yield strength 600MPa level Thin Specs envelope steel band, chemical composition is by weight percentage:C:0.06~0.08%, Si:≤ 0.20%, Mn:1.5~1.7%, P:≤ 0.020%, S:≤ 0.010%, Alt (full aluminium):0.10~0.04%, Nb: 0.025~0.035%, Ti:0.08~0.10%, balance of Fe and inevitable impurity.
Embodiment 1
Raw material molten iron is obtained through Deep Desulphurization of Hot Metal, converter top and bottom blowing, ladle argon-blown, LF external refinings and continuous casting process The 230mm heavy slabs of chemical component weight percentage shown in table 1.1275 DEG C of slab heating temperature, heat time 185min, roughing Carry out in R1 and R2 roughing mills, adopt " 3+3 " passage, pass deformation is increased during roughing, single pass is with respect to reduction ratio at least More than two passages control more than 20%;Finish rolling is carried out in F1-F7 finishing mills, and each pass deformation is strictly controlled during finish rolling, essence Roll 1008 DEG C of start rolling temperature, open rolling thickness is 38mm, 888 DEG C of finishing temperature, finished product steel belt thickness 2.5mm.Roll rear steel band to enter Laminar cooling system, 589 DEG C of coiling temperature mean value is finally obtained the steel band.
Embodiment 2
Embodiment is 1271 DEG C with embodiment 1, wherein heating-up temperature, is incubated 188 minutes, finish rolling start rolling temperature 1003 DEG C, open rolling thickness be 39mm, 890 DEG C of finishing temperature, finished product steel belt thickness 2.75mm.Roll rear steel band and enter laminar cooling system, 588 DEG C of coiling temperature mean value, is finally obtained the steel band.
Embodiment 3
Embodiment is 1270 DEG C with embodiment 1, wherein heating-up temperature, is incubated 185 minutes;989 DEG C of finish rolling start rolling temperature, Open rolling thickness be 41mm, 884 DEG C of finishing temperature, finished product steel belt thickness 3.0mm.Roll rear steel band and enter laminar cooling system, batch 586 DEG C of temperature averages, are finally obtained the steel band.
The chemical composition (wt%) of the embodiment of the present invention 1~3 of table 1
Embodiment C Si Mn P S Nb Ti Alt
1 0.06 0.20 1.53 0.012 0.009 0.025 0.080 0.02
2 0.07 0.16 1.60 0.015 0.008 0.031 0.084 0.03
3 0.08 0.10 1.65 0.013 0.006 0.033 0.095 0.04
Mechanical properties test is carried out to the steel plate of the embodiment of the present invention 1~3, assay is shown in Table 2.
The mechanical property of the steel plate of the embodiment of the present invention 1~3 of table 2
As seen from Table 2, high intensity Thin Specs (2.0~3.0mm) motor vehicle body using present invention production is strong with steel band Degree and elongation percentage comply fully with standard requirement, and surplus is larger.
As shown in figure 1, being the metallographic structure figure of the steel plate of embodiment 3 in the present invention;As shown in Fig. 2 being implemented in the present invention Steel plate width (double) cold-bending property (d=0) schematic diagram of example 3.
The grain structure of steel band is extremely tiny, and it is excellent that the wide clod wash of steel band and double cold bending tests show that steel band of the present invention has Cold roll forming performance, fully meet the processing use requirement of user.
Term used herein is explanation and exemplary and nonrestrictive term.Because the present invention can be with various Form be embodied as without deviating from invention it is spiritual or substantive, it should therefore be appreciated that above-described embodiment be not limited to it is any aforesaid Details, and should widely explaining in the spirit and scope that appended claims are limited, thus fall into claim or its etc. Whole changes and remodeling in the range of effect all should be appended claims and be covered.

Claims (6)

1. a kind of yield strength 600MPa level Thin Specs envelope steel band, it is characterised in that:Chemical composition includes by weight percentage: C:0.06~0.08%, Si:≤ 0.20%, Mn:1.5~1.7%, P:≤ 0.020%, S:≤ 0.010%, Alt:0.10~ 0.04%th, Nb:0.025~0.035%, Ti:0.08~0.10%, balance of Fe and inevitable impurity.
2. yield strength 600MPa level Thin Specs envelope steel band as claimed in claim 1, it is characterised in that:Si:0.10~ 0.20%, Mn:1.53~1.65%, P:0.012~0.015%, S:0.006~0.009%, Nb:0.025~0.033%, Ti:0.080~0.095%, Alt:0.02~0.04.
3. a kind of manufacture method of yield strength 600MPa level Thin Specs envelope steel band, including converter smelting, LF refining, continuous casting, Heating of plate blank, frame roughing, frame finish rolling, section cooling, batch, it is characterised in that:
In converter steelmaking process, bottom-blowing of converter causes molten steel to reduce using whole Argon pattern, terminal hit at first time because re-blowing Nitrogen pick-up;The further deoxidation of LF refining, desulfurization, removal are mingled with, adjusting component and temperature, control Argon intensity, according to early stage it is strong, in The phase principle weak compared with the strong, later stage formulates Argon curve;
In heating process, at 1270 DEG C~1290 DEG C, the heat time controls in 180-240min heating and temperature control, it is ensured that alloy The abundant solid solution of element, plate slab temperature is uniform;
Rolling is rolled using two-stage control, single pass it is relative it is more than reduction ratio at least two passages more than 20%;It is tight during finish rolling Lattice control each pass deformation, finish rolling start rolling temperature >=950 DEG C, and open rolling thickness is 37~42mm, finishing temperature 865-895 DEG C; Roll rear steel band and enter laminar cooling system, 565-595 DEG C of coiling temperature;Obtain yield strength 600MPa level Thin Specs envelope steel Band, chemical composition includes by weight percentage:C:0.06~0.08%, Si:≤ 0.20%, Mn:1.5~1.7%, P:≤ 0.020%th, S:≤ 0.010%, Alt:0.10~0.04%, Nb:0.025~0.035%, Ti:0.08~0.10%, it is balance of Fe and inevitable impurity.
4. the manufacture method of yield strength 600MPa level Thin Specs envelope steel band as claimed in claim 3, it is characterised in that:Continuous casting During, conticaster adopts straight circular-arc type continuous casting machine, using solidification end dynamic soft-reduction, dynamic secondary cooling technology, by constant temperature, perseverance Pulling rate technique.
5. the manufacture method of yield strength 600MPa level Thin Specs envelope steel band as claimed in claim 3, it is characterised in that:Steel band For crystal grain is tiny and uniform ferrite+bainite structure.
6. the manufacture method of yield strength 600MPa level Thin Specs envelope steel band as claimed in claim 3, it is characterised in that:Continuous casting Afterwards slab thickness is 230mm, and thickness of strips is 2.5~3.0mm.
CN201611243220.2A 2016-12-29 2016-12-29 Thin gauge carriage body steel belt with yield strength of 600MPa, and manufacturing method of thin gauge carriage body steel belt Pending CN106636907A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109706387A (en) * 2018-12-07 2019-05-03 包头钢铁(集团)有限责任公司 A kind of yield strength 600MPa grades of steel for engineering machinery bands and preparation method thereof
CN110184535A (en) * 2019-05-21 2019-08-30 邯郸钢铁集团有限责任公司 600L steel for automobile crossbeam band and production method with good processability
CN111979393A (en) * 2019-05-22 2020-11-24 武汉科技大学 Hot-rolled high-strength steel plate with excellent low-temperature toughness and preparation method thereof
CN113308646A (en) * 2021-05-28 2021-08-27 攀钢集团攀枝花钢铁研究院有限公司 High-fatigue-performance 700 MPa-grade hot-rolled automobile crossbeam steel strip and preparation method thereof
CN113322413A (en) * 2021-05-28 2021-08-31 攀钢集团攀枝花钢铁研究院有限公司 High-fatigue-performance 900 MPa-grade hot-rolled automobile beam steel strip and preparation method thereof
CN113322416A (en) * 2021-05-31 2021-08-31 攀钢集团攀枝花钢铁研究院有限公司 800 MPa-grade hot-rolled automobile beam steel strip with high fatigue performance and preparation method thereof
CN113373375A (en) * 2021-05-26 2021-09-10 攀钢集团攀枝花钢铁研究院有限公司 600 MPa-grade hot-rolled automobile beam steel strip with high fatigue performance and preparation method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104060167A (en) * 2014-06-18 2014-09-24 攀钢集团攀枝花钢铁研究院有限公司 Hot-rolled steel sheet and production method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104060167A (en) * 2014-06-18 2014-09-24 攀钢集团攀枝花钢铁研究院有限公司 Hot-rolled steel sheet and production method thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109706387A (en) * 2018-12-07 2019-05-03 包头钢铁(集团)有限责任公司 A kind of yield strength 600MPa grades of steel for engineering machinery bands and preparation method thereof
CN110184535A (en) * 2019-05-21 2019-08-30 邯郸钢铁集团有限责任公司 600L steel for automobile crossbeam band and production method with good processability
CN111979393A (en) * 2019-05-22 2020-11-24 武汉科技大学 Hot-rolled high-strength steel plate with excellent low-temperature toughness and preparation method thereof
CN113373375A (en) * 2021-05-26 2021-09-10 攀钢集团攀枝花钢铁研究院有限公司 600 MPa-grade hot-rolled automobile beam steel strip with high fatigue performance and preparation method thereof
CN113308646A (en) * 2021-05-28 2021-08-27 攀钢集团攀枝花钢铁研究院有限公司 High-fatigue-performance 700 MPa-grade hot-rolled automobile crossbeam steel strip and preparation method thereof
CN113322413A (en) * 2021-05-28 2021-08-31 攀钢集团攀枝花钢铁研究院有限公司 High-fatigue-performance 900 MPa-grade hot-rolled automobile beam steel strip and preparation method thereof
CN113322416A (en) * 2021-05-31 2021-08-31 攀钢集团攀枝花钢铁研究院有限公司 800 MPa-grade hot-rolled automobile beam steel strip with high fatigue performance and preparation method thereof

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Application publication date: 20170510