CN109161806A - A kind of 700MPa grades of automotive frame steel band and preparation method thereof - Google Patents
A kind of 700MPa grades of automotive frame steel band and preparation method thereof Download PDFInfo
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- CN109161806A CN109161806A CN201811268002.3A CN201811268002A CN109161806A CN 109161806 A CN109161806 A CN 109161806A CN 201811268002 A CN201811268002 A CN 201811268002A CN 109161806 A CN109161806 A CN 109161806A
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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
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- 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
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention provides a kind of 700MPa grades of automotive frame steel band and preparation method thereof, wherein the chemical component of the beam steel band is C:0.06-0.08% by weight percentage, Si:0.10-0.20%, Mn:1.60-1.80%, P≤0.017%, S≤0.002%, Alt:0.020-0.050%, Ti:0.065-0.085%, Nb:0.045-0.055%, surplus are Fe and inevitable impurity.700MPa grades of beam steel band provided by the invention has excellent mechanical property, especially its low-temperature flexibility, while having good welding performance, can be used for requiring well forming performance and has the automobile structures such as high-intensitive desired vehicle beam, stringer.
Description
Technical field
The present invention relates to high-strength steel production technical fields, especially have high-intensitive, excellent plasticity and welding performance, good
Good low temperature impact properties are mainly used for requiring well forming performance and having high-intensitive desired vehicle beam, stringer etc.
Automobile structure.
Background technique
Due to the shortage of environmental pressure and resource, lightweight has become an important class of auto industry sustainable development
Topic, lightweight have proved to be the key technology route of automobile " energy-saving and emission-reduction ".The lightweight of automobile is exactly guaranteeing automobile
Under the premise of intensity and security performance, the equipment quality of automobile is reduced as much as possible, to improve the dynamic property of automobile, reduces combustion
Material consumption, reduces exhaust pollution.It is demonstrated experimentally that fuel efficiency can be improved 6%~8%, oil if vehicle complete vehicle weight reduces by 10%
Consumption can reduce about 7%.China's energy shortage, road overload and the statuses such as conevying efficiency is low are made a general survey of, due to environmental protection and energy-efficient need
It wants, automotive light weight technology has not only become the task of top priority of Domestic Automotive Industry development, also becomes the trend of world car development.?
Special purpose vehicle industry can make the intensity of vehicle be greatly improved using high-strength steel sheet, and plate thickness is also effectively subtracted
It is thin, it is significantly reduced complete vehicle weight, load is improved, improves the service life of vehicle, have the advantage that raising to logistics company
Logistics cost is greatly reduced in conevying efficiency, and energy-saving and emission-reduction social benefit is significant, possesses compared with traditional general steel plate without comparable
Quasi- advantage.
Automotive frame is the main component of truck, almost carries the weight of cargo whole, therefore the quality of crossbeam
Directly influence the service life and traffic safety of vehicle.At present in automobile manufacture industry, automotive frame is generally used and is struck out
Shape and rolling formation technique, mode of texturing is based on cold deformation, therefore it is required that beam steel has good comprehensive performance, especially
It is forming property.
Tang Jiayue et al. (trial-production of Tang Jiayue etc., 700MPa grades of high-strength automobile side bar steel, Hebei Metallurgy, 2016 the 9th
Phase) Nb, V, Ti combined microalloying technique are used, it is protected by desulfurizing iron, vanadium extraction by converter blowing, converter smelting, the refining of LF furnace, slab
The technical process such as shield casting, the 700MPa grade beam steel of production can satisfy user's requirement, but alloy contains in chemical component
It measures more, alloying element V is added, high production cost reduces a ton steel benefit.Zhao Peilin et al. is (Zhao Peilin etc., 700MPa grades high
The steel research and development of strength automotive crossbeam, Laigang science and technology, the 3rd phase, in June, 2010) in 1500mm hot rolling line by adding
Add microalloy element Nb, Ti to promote Carbonitride Precipitation, increases precipitation strength effect, the intensity of material is made to get a promotion, but
Design the steel plate tensile strength manufactured experimently out and be respectively less than 750MPa, cause to design since intensity is not high the thickness Reducing thickness of crossbeam by
Limitation.Wang Qi et al. (exploitation of Wang Qi etc., C700L high-strength vehicle beam steel, Hebei Metallurgy, the 8th phase in 2014) using Nb,
V, Ti combined microalloying technique enables the properties of material in 1780mm hot rolling line by cooling controlling and rolling controlling process
Meet user's requirement, but -20 DEG C of low-temperature impact toughness for designing the steel plate manufactured experimently out are lower.
The content of background technology part is only the technology that inventor is known, not the existing skill of natural representative this field
Art.
Summary of the invention
For the prior art, there are one or more of problems, and in one aspect of the invention, the present invention provides one kind
The chemical component of 700MPa grades of automotive frame steel bands, the beam steel band is C:0.06-0.08%, Si by weight percentage:
0.10-0.20%, Mn:1.60-1.80%, P≤0.017%, S≤0.002%, Alt:0.020-0.050%, Ti:0.065-
0.085%, Nb:0.045-0.055%, surplus are Fe and inevitable impurity.
Preferably, the chemical component of above-mentioned beam steel band is C:0.075%, Si:0.17%, Mn by weight percentage:
1.69%, P:0.012%, S:0.001%, Alt:0.033%, Ti:0.076%, Nb:0.051%, surplus are Fe and can not keep away
The impurity exempted from.
In another aspect of this invention, the present invention also provides the preparation method of above-mentioned 700MPa grade automotive frame steel band,
Comprising steps of the heating of continuous casting, continuous casting billet, roughing, finish rolling, cooling and batching.
Preferably, above-mentioned continuous casting step includes process: molten iron pretreatment, converter top-bottom blowing, RH refining and casting machine；Wherein
The molten iron is located to carry out desulfurization, decarburization, dephosphorizing pretreatment in advance；Tapping Temperature of Bof >=1620 DEG C.
Preferably, in the continuous casting step, molten steel includes the chemical component of following weight percentage: C:0.06-
0.08%, Si:0.10-0.20%, Mn:1.60-1.80%, P≤0.017%, S≤0.002%, Alt:0.020-0.050%,
Ti:0.065-0.085%, Nb:0.045-0.055%.Micro Nb, Ti microalloy element is added in steelmaking process, in conjunction with carbon, manganese
The solution strengthening of element and the refined crystalline strengthening of alloying element keep good punching while improving intensity to improve intensity
Performance and welding performance are pressed, good intensity and plastic equilibrium are showed.To further strengthening smelting and continuous casting process simultaneously
Accurate control, guarantees steel cleanliness, prevents final products surface from occurring being mingled with class defect.
Preferably, in the continuous casting billet heating stepses, the heating process controls 180~240min of time inside furnace, comes out of the stove
1200 ± 20 DEG C of temperature.
Preferably, in the roughing step, the roughing uses the 2 machine frame rolling mill roughing of 3+3 mode.
Preferably, in the finish rolling step, the finish rolling uses 7 rack continuously variable crown (Continuously
Variable crown, cvc) milling train finish rolling, start rolling temperature > 1020 DEG C of the finish rolling, finishing temperature is 820~860 DEG C.
The present invention uses roughing and finish rolling two-stage control rolling mill practice, the i.e. rolling of austenite recrystallization area and austenite not
Recrystallization zone rolling enables steel that can complete rolling while obtain the deformed austenite tissue of storage large deformation, and then obtains
Tiny phase-change organization improves the intensity of steel by refined crystalline strengthening.
Preferably, it the cooling and batches in step, it is described to be cooled to section cooling, it is described using leading portion refrigerating mode
Cooling velocity is 25~30 DEG C/s, and the coiling temperature is 580~620 DEG C.
The present invention is based on low carbon manganese steel, compound addition niobium element and titanium elements, and niobium can refine crystal grain and reduce steel
Superheated susceptivity and temper brittleness improve intensity, but will lead to steel band plasticity and toughness is declined, but the inventors discovered that
Using material composition provided by the invention and quality proportioning, and controlled rolling and Controlled cooling process are combined, using 2250mm heat
It rolls production line and develops the grade high-strength hot-rolled automotive frame steel band of 700MPa, there is good processability, low-temperature flexibility and tired
Labor performance is successfully applied to heavy-duty commercial vehicle manufacture, and has the advantages that
The present invention provides a kind of 700MPa grades of automotive frame steel band, is designed by reasonable ingredient, which contains
Ti:0.065-0.085%, Nb:0.045-0.055% microalloy element, microscopic structure are ferrite+pearlite, and grain size is about
13 grades, have the characteristics that it is high-intensitive, excellent shape performance and welding performance, be suitable for the automobiles such as vehicle beam, stringer
Structural member.Mechanical property and processing performance meet yield strength >=650MPa, and 720~950MPa of tensile strength, elongation percentage A >=
18%, clod wash d=2a, -20 DEG C of impact value >=70J requirements.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the metallographic structure figure of 2 steel band of the embodiment of the present invention.
Specific embodiment
Hereinafter, certain exemplary embodiments are simply just described.As one skilled in the art will recognize that
Like that, without departing from the spirit or scope of the present invention, described embodiment can be modified by various different modes.
Therefore, attached drawing and description are considered essentially illustrative rather than restrictive.
Following disclosure provides many different embodiments or example is used to realize distinct methods of the invention.In order to
Simplify disclosure of the invention, hereinafter the material of specific examples and step are described.Certainly, they are merely examples, and
And it is not intended to limit the present invention.In addition, the present invention provides various specific techniques and material example, but ability
Domain those of ordinary skill can be appreciated that the application of other techniques and/or the use of other materials.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
In the first embodiment of the present invention, the present invention provides a kind of 700MPa grades of automotive frame steel band, the crossbeam
The chemical component of steel band is C:0.06-0.08%, Si:0.10-0.20%, Mn:1.60-1.80% by weight percentage, P≤
0.017%, S≤0.002%, Alt:0.020-0.050%, Ti:0.065-0.085%, Nb:0.045-0.055%, surplus are
Fe and inevitable impurity.Such as the chemical component of 700MPa grades of automotive frame steel band provided by the invention is by weight percentage
Are as follows: C:0.06%, Si:0.20%, Mn:1.60%, P≤0.017%, S≤0.002%, Alt:0.050%, Ti:0.065%,
Nb:0.045%, surplus are Fe and inevitable impurity；Or C:0.08%, Si:0.10%, Mn:1.80%, P≤
0.017%, S≤0.002%, Alt:0.020%, Ti:0.085%, Nb:0.045%, surplus be Fe and inevitably it is miscellaneous
Matter；Or C:0.07%, Si:0.15%, Mn:1.70%, P≤0.017%, S≤0.002%, Alt:0.030%, Ti:
0.070%, Nb:0.050%, surplus are Fe and inevitable impurity；Deng.
In one preferred embodiment, the chemical component of above-mentioned beam steel band is C:0.075% by weight percentage,
Si:0.17%, Mn:1.69%, P:0.012%, S:0.001%, Alt:0.033%, Ti:0.076%, Nb:0.051%, it is remaining
Amount is Fe and inevitable impurity.
In second embodiment of the invention, the present invention also provides the preparation sides of above-mentioned 700MPa grade automotive frame steel band
Method, comprising steps of the heating of continuous casting, continuous casting billet, roughing, finish rolling, cooling and batching.
In a preferred embodiment, above-mentioned continuous casting step includes process: molten iron pretreatment, converter top-bottom blowing, RH
Refining and casting machine；Specifically, molten iron is subjected to desulfurization pretreatment, obtains molten steel decarburization, dephosphorization using top and bottom combined blown converter smelting
To molten steel, converter, Tapping Temperature of Bof >=1620 DEG C are added in gained molten steel；Then molten steel after converter smelting is subjected to LF refining work
Sequence is added the alloys such as manganese iron, ferrosilicon, ferro-niobium according to molten steel composition and is adjusted to target component.Molten steel carries out RH operation after LF refining,
After RH application of vacuum, adjustment argon flow makes molten steel be in soft blow state, and feeding Si-Ca line carries out Calcium treatment, after feeding silk
Guarantee that the soft blow time is greater than 8min, prevents molten steel exposed.
In one preferred embodiment, in above-mentioned continuous casting step, molten steel includes the chemistry of following weight percentage
Ingredient: C:0.06-0.08%, Si:0.10-0.20%, Mn:1.60-1.80%, P≤0.017%, S≤0.002%, Alt:
0.020-0.050%, Ti:0.065-0.085%, Nb:0.045-0.055%.Such as: C:0.06%, Si:0.20%, Mn:
1.60%, P≤0.017%, S≤0.002%, Alt:0.050%, Ti:0.065%, Nb:0.045%；Or C:0.08%, Si:
0.10%, Mn:1.80%, P≤0.017%, S≤0.002%, Alt:0.020%, Ti:0.085%, Nb:0.045%；Or C:
0.07%, Si:0.15%, Mn:1.70%, P≤0.017%, S≤0.002%, Alt:0.030%, Ti:0.070%, Nb:
0.050%；Deng.Micro Nb, Ti microalloy element is added in steelmaking process, in conjunction with carbon, the solution strengthening of manganese element and alloy member
The refined crystalline strengthening of element keeps good punching performance and welding performance while improving intensity to improve intensity, presents
Good intensity and plastic equilibrium out.To smelting and the accurate control of continuous casting process is further strengthened simultaneously, guarantee that steel is clean
Degree, prevents final products surface from occurring being mingled with class defect.
In one preferred embodiment, in the continuous casting billet heating stepses, the heating process controls time inside furnace
180~240min, 1200 ± 20 DEG C of tapping temperature；Such as control time inside furnace be 180min, 190min, 200min, 210min,
220min, 230min, 240min, etc..
In one preferred embodiment, in the roughing step, the roughing is thick using 2 machine frame rolling mill of 3+3 mode
It rolls.
In one preferred embodiment, in the finish rolling step, the finish rolling uses 7 rack continuously variable crowns
(Continuously variable crown, cvc) milling train finish rolling, start rolling temperature > 1020 DEG C of the finish rolling, finishing temperature
It is 820~860 DEG C, such as 820 DEG C, 830 DEG C, 840 DEG C, 850 DEG C, 860 DEG C, etc..
The present invention uses roughing and finish rolling two-stage control rolling mill practice, the i.e. rolling of austenite recrystallization area and austenite not
Recrystallization zone rolling enables steel that can complete rolling while obtain the deformed austenite tissue of storage large deformation, and then obtains
Tiny phase-change organization improves the intensity of steel by refined crystalline strengthening.
In one preferred embodiment, it the cooling and batches in step, it is described to be cooled to section cooling, before
Section refrigerating mode, the cooling velocity are 25~30 DEG C/s, such as 25 DEG C/s, 26 DEG C/s, 27 DEG C/s, 28 DEG C/s, 29 DEG C/s, 30
DEG C/s, etc.；The coiling temperature is 580~620 DEG C, such as 580 DEG C, 590 DEG C, 600 DEG C, 610 DEG C, 620 DEG C, etc..
Embodiment 1: the preparation of 700MPa grade automotive frame steel band of the invention
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, steel scrap using top and bottom combined blown converter smelting
Converter, Tapping Temperature of Bof >=1620 DEG C are added.Then molten steel after converter smelting is subjected to LF refining process, according to molten steel composition
The alloys such as manganese iron, ferrosilicon, ferro-niobium are added and are adjusted to target component.Molten steel carries out RH operation after LF refining, and RH application of vacuum terminates
Afterwards, adjustment argon flow makes molten steel be in soft blow state, and feeding Si-Ca line carries out Calcium treatment, guarantees that the soft blow time is big after feeding silk
In 8min, prevent molten steel exposed.It is smelted by chemical component shown in table 1,25 DEG C of the sheet billet continuous casting degree of superheat.It is clear that slab is carried out later
Reason, slow cooling and continuous casting billet quality inspection.Slab heating temperature is 1205 DEG C, heating time 220min, by the slab after heating
Carry out high pressure water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.Finish rolling start rolling temperature 1030
DEG C, finish rolling finishing temperature is 840 DEG C.Section cooling is cooling using leading portion, 30 DEG C/s of cooling velocity, and coiling temperature is 580 DEG C, at
Product are with a thickness of 14mm.The mechanics properties testing for the steel band that the embodiment is prepared the results are shown in Table 2.
Embodiment 2: the preparation of 700MPa grade automotive frame steel band of the invention
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, steel scrap using top and bottom combined blown converter smelting
Converter, Tapping Temperature of Bof >=1620 DEG C are added.Then molten steel after converter smelting is subjected to LF refining process, according to molten steel composition
The alloys such as manganese iron, ferrosilicon, ferro-niobium are added and are adjusted to target component.Molten steel carries out RH operation after LF refining, and RH application of vacuum terminates
Afterwards, adjustment argon flow makes molten steel be in soft blow state, and feeding Si-Ca line carries out Calcium treatment, guarantees that the soft blow time is big after feeding silk
In 8min, prevent molten steel exposed.It is smelted by chemical component shown in table 1,25 DEG C of the sheet billet continuous casting degree of superheat.It is clear that slab is carried out later
Reason, slow cooling and continuous casting billet quality inspection.Slab heating temperature is 1200 DEG C, heating time 230min, by the slab after heating
Carry out high pressure water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.Finish rolling start rolling temperature 1020
DEG C, finish rolling finishing temperature is 840 DEG C.Section cooling is cooling using leading portion, 28 DEG C/s of cooling velocity, and coiling temperature is 600 DEG C, at
Product are with a thickness of 14mm.Fig. 1 is the typical microstructures figure of steel band manufactured in the present embodiment, it can be seen that microscopic structure is iron
Ferritic and a small amount of pearlite, about 13 grades of grain size.The mechanics properties testing for the steel band that the embodiment is prepared the results are shown in Table 2.
Embodiment 3: the preparation of 700MPa grade automotive frame steel band of the invention
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, steel scrap using top and bottom combined blown converter smelting
Converter, Tapping Temperature of Bof >=1620 DEG C are added.Then molten steel after converter smelting is subjected to LF refining process, according to molten steel composition
The alloys such as manganese iron, ferrosilicon, ferro-niobium are added and are adjusted to target component.Molten steel carries out RH operation after LF refining, and RH application of vacuum terminates
Afterwards, adjustment argon flow makes molten steel be in soft blow state, and feeding Si-Ca line carries out Calcium treatment, guarantees that the soft blow time is big after feeding silk
In 8min, prevent molten steel exposed.It is smelted by chemical component shown in table 1,25 DEG C of the sheet billet continuous casting degree of superheat.It is clear that slab is carried out later
Reason, slow cooling and continuous casting billet quality inspection.Slab heating temperature is 1210 DEG C, heating time 228min, by the slab after heating
Carry out high pressure water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.Finish rolling start rolling temperature 1040
DEG C, finish rolling finishing temperature is 850 DEG C.Section cooling is cooling using leading portion, 25 DEG C/s of cooling velocity, and coiling temperature is 620 DEG C, at
Product are with a thickness of 14mm.The mechanics properties testing for the steel band that the embodiment is prepared the results are shown in Table 2.
Embodiment 4: the preparation of 700MPa grade automotive frame steel band of the invention
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, steel scrap using top and bottom combined blown converter smelting
Converter, Tapping Temperature of Bof >=1620 DEG C are added.Then molten steel after converter smelting is subjected to LF refining process, according to molten steel composition
The alloys such as manganese iron, ferrosilicon, ferro-niobium are added and are adjusted to target component.Molten steel carries out RH operation after LF refining, and RH application of vacuum terminates
Afterwards, adjustment argon flow makes molten steel be in soft blow state, and feeding Si-Ca line carries out Calcium treatment, guarantees that the soft blow time is big after feeding silk
In 8min, prevent molten steel exposed.It is smelted by chemical component shown in table 1,25 DEG C of the sheet billet continuous casting degree of superheat.It is clear that slab is carried out later
Reason, slow cooling and continuous casting billet quality inspection.Slab heating temperature is 1220 DEG C, heating time 180min, by the slab after heating
Carry out high pressure water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.Finish rolling start rolling temperature 1030
DEG C, finish rolling finishing temperature is 860 DEG C.Section cooling is cooling using leading portion, 30 DEG C/s of cooling velocity, and coiling temperature is 590 DEG C, at
Product are with a thickness of 14mm.The mechanics properties testing for the steel band that the embodiment is prepared the results are shown in Table 2.
Embodiment 5: the preparation of 700MPa grade automotive frame steel band of the invention
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, steel scrap using top and bottom combined blown converter smelting
Converter, Tapping Temperature of Bof >=1620 DEG C are added.Then molten steel after converter smelting is subjected to LF refining process, according to molten steel composition
The alloys such as manganese iron, ferrosilicon, ferro-niobium are added and are adjusted to target component.Molten steel carries out RH operation after LF refining, and RH application of vacuum terminates
Afterwards, adjustment argon flow makes molten steel be in soft blow state, and feeding Si-Ca line carries out Calcium treatment, guarantees that the soft blow time is big after feeding silk
In 8min, prevent molten steel exposed.It is smelted by chemical component shown in table 1,25 DEG C of the sheet billet continuous casting degree of superheat.It is clear that slab is carried out later
Reason, slow cooling and continuous casting billet quality inspection.Slab heating temperature is 1200 DEG C, heating time 240min, by the slab after heating
Carry out high pressure water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.Finish rolling start rolling temperature 1040
DEG C, finish rolling finishing temperature is 820 DEG C.Section cooling is cooling using leading portion, 25 DEG C/s of cooling velocity, and coiling temperature is 600 DEG C, at
Product are with a thickness of 14mm.The mechanics properties testing for the steel band that the embodiment is prepared the results are shown in Table 2.
The chemical component (wt%) of 1. 1-5 of the embodiment of the present invention of table
The mechanics properties testing result for the steel band that 2. 1-5 of the embodiment of the present invention of table is prepared
From the data in table 2, it can be seen that a kind of 700MPa grades of beam steel hot rolled strips provided by the invention, mechanical property and work
Skill performance meets yield strength >=620MPa, tensile strength >=700MPa, elongation percentage A >=18%, clod wash d=2a, -20 DEG C of longitudinal directions
Ballistic work KV2≥70J。
From above-described embodiment result it is found that beam steel band of the invention have excellent mechanical property, especially its
Low-temperature flexibility, while there is good welding performance.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (9)
1. a kind of 700MPa grades of automotive frame steel band, wherein the chemical component of the beam steel band is C by weight percentage:
0.06-0.08%, Si:0.10-0.20%, Mn:1.60-1.80%, P≤0.017%, S≤0.002%, Alt:0.020-
0.050%, Ti:0.065-0.085%, Nb:0.045-0.055%, surplus are Fe and inevitable impurity.
2. 700MPa grades of automotive frame steel band described in claim 1, wherein the chemical component by weight hundred of the beam steel band
Divide than being C:0.075%, Si:0.17%, Mn:1.69%, P:0.012%, S:0.001%, Alt:0.033%, Ti:
0.076%, Nb:0.051%, surplus are Fe and inevitable impurity.
3. the preparation method of 700MPa grades of automotive frame steel band of any of claims 1 or 2, comprising steps of continuous casting, continuous casting billet add
It heat, roughing, finish rolling, cooling and batches.
4. the preparation method of 700MPa grades of automotive frame steel band as claimed in claim 3, wherein the continuous casting step includes process:
Molten iron pretreatment, converter top-bottom blowing, RH refining and casting machine；Wherein the molten iron is located to locate in advance for progress desulfurization, decarburization, dephosphorization in advance
Reason；Tapping Temperature of Bof >=1620 DEG C.
5. preparation method as claimed in claim 3, wherein molten steel includes the change of following weight percentage in the continuous casting step
It studies point: C:0.06-0.08%, Si:0.10-0.20%, Mn:1.60-1.80%, P≤0.017%, S≤0.002%, Alt:
0.020-0.050%, Ti:0.065-0.085%, Nb:0.045-0.055%.
6. preparation method as claimed in claim 3, wherein the heating process control is in furnace in the continuous casting billet heating stepses
Between 180~240min, 1200 ± 20 DEG C of tapping temperature.
7. preparation method as claimed in claim 3, wherein the roughing uses 2 machine frame rolling mill of 3+3 mode in the roughing step
Roughing.
8. preparation method as claimed in claim 3, wherein the finish rolling uses 7 rack continuously variable crowns in the finish rolling step
Milling train finish rolling, start rolling temperature > 1020 DEG C of the finish rolling, finishing temperature are 820~860 DEG C.
9. preparation method as claimed in claim 3, wherein the cooling and batch in step, it is described to be cooled to section cooling, it adopts
With leading portion refrigerating mode, the cooling velocity is 25~30 DEG C/s, and the coiling temperature is 580~620 DEG C.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029286A (en) * | 2019-05-27 | 2019-07-19 | 包头钢铁（集团）有限责任公司 | A kind of 780MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof |
| CN111549288A (en) * | 2020-05-22 | 2020-08-18 | 包头钢铁（集团）有限责任公司 | Automobile girder steel with thickness of 12.0-16.0 mm and high toughness of 700MPa and production method thereof |
| CN111809110A (en) * | 2020-06-17 | 2020-10-23 | 包头钢铁（集团）有限责任公司 | Rare earth treated 700 MPa-grade automotive frame steel strip with thick specification and manufacturing method thereof |
| CN112375964A (en) * | 2020-10-15 | 2021-02-19 | 包头钢铁（集团）有限责任公司 | Hot-rolled steel strip for 3.0-6.0mm high-strength welded pipe and production method thereof |
| CN113549843A (en) * | 2021-07-29 | 2021-10-26 | 重庆钢铁股份有限公司 | 610L automobile beam steel belt and manufacturing and application thereof |
| CN115198049A (en) * | 2022-07-25 | 2022-10-18 | 河北纵横集团丰南钢铁有限公司 | Refining preparation method of girder steel for automobile |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101565794A (en) * | 2008-04-22 | 2009-10-28 | 宝山钢铁股份有限公司 | High-strength hot rolling automotive frame steel plate and manufacturing method thereof |
| CN101805873A (en) * | 2009-10-30 | 2010-08-18 | 莱芜钢铁股份有限公司 | Low-cost and high-strength steel for automobile crossbeam and manufacturing method thereof |
| CN103014494A (en) * | 2011-09-21 | 2013-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling steel plate for automobile girder, and manufacturing method thereof |
| CN106834948A (en) * | 2017-03-03 | 2017-06-13 | 内蒙古包钢钢联股份有限公司 | Longitudinal yield strength 700MPa grades of hot rolled strip and preparation method thereof |
| CN108315639A (en) * | 2018-01-03 | 2018-07-24 | 承德钢铁集团有限公司 | A kind of high tenacity 600MPa grades of beam steels and its production method |
-
2018
- 2018-10-29 CN CN201811268002.3A patent/CN109161806A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101565794A (en) * | 2008-04-22 | 2009-10-28 | 宝山钢铁股份有限公司 | High-strength hot rolling automotive frame steel plate and manufacturing method thereof |
| CN101805873A (en) * | 2009-10-30 | 2010-08-18 | 莱芜钢铁股份有限公司 | Low-cost and high-strength steel for automobile crossbeam and manufacturing method thereof |
| CN103014494A (en) * | 2011-09-21 | 2013-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling steel plate for automobile girder, and manufacturing method thereof |
| CN106834948A (en) * | 2017-03-03 | 2017-06-13 | 内蒙古包钢钢联股份有限公司 | Longitudinal yield strength 700MPa grades of hot rolled strip and preparation method thereof |
| CN108315639A (en) * | 2018-01-03 | 2018-07-24 | 承德钢铁集团有限公司 | A kind of high tenacity 600MPa grades of beam steels and its production method |
Non-Patent Citations (1)
| Title |
|---|
| 孙玮 崔风平: "《中厚板生产900问》", 31 July 2014, 冶金工业出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029286A (en) * | 2019-05-27 | 2019-07-19 | 包头钢铁（集团）有限责任公司 | A kind of 780MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof |
| CN111549288A (en) * | 2020-05-22 | 2020-08-18 | 包头钢铁（集团）有限责任公司 | Automobile girder steel with thickness of 12.0-16.0 mm and high toughness of 700MPa and production method thereof |
| CN111809110A (en) * | 2020-06-17 | 2020-10-23 | 包头钢铁（集团）有限责任公司 | Rare earth treated 700 MPa-grade automotive frame steel strip with thick specification and manufacturing method thereof |
| CN112375964A (en) * | 2020-10-15 | 2021-02-19 | 包头钢铁（集团）有限责任公司 | Hot-rolled steel strip for 3.0-6.0mm high-strength welded pipe and production method thereof |
| CN113549843A (en) * | 2021-07-29 | 2021-10-26 | 重庆钢铁股份有限公司 | 610L automobile beam steel belt and manufacturing and application thereof |
| CN115198049A (en) * | 2022-07-25 | 2022-10-18 | 河北纵横集团丰南钢铁有限公司 | Refining preparation method of girder steel for automobile |
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Application publication date: 20190108 |