CN110512142A - A kind of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel and its preparation method and application - Google Patents
A kind of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel and its preparation method and application Download PDFInfo
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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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The present invention relates to a kind of low-carbon-equivalent low yield strength ratio cold-rolled biphase steels and its preparation method and application, belong to automobile steel technical field, low-carbon-equivalent low yield strength ratio cold-rolled biphase steel provided in an embodiment of the present invention, by weight percentage, the steel chemical composition is as follows: C:0.06-0.095%, Si:0.1-0.3%, Mn:1.6-1.9%, Cr:0.5-0.8%, Mo:0.1-0.4%, P≤0.010%, S≤0.005%, Ti:0.01-0.04%, Al:0.02-0.07%, B:0.002-0.005%, surplus are iron and other inevitable impurity elements.
Description
Technical field
The invention belongs to automobile steel technical fields, and in particular to a kind of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel and its
Preparation method and application.
Background technique
Due to low yield tensile ratio, the advantages that high initial work hardening rate, intensity and ductility no-float, cold-rolled biphase steel is
Through becoming the most widely used steel grade of automotive light weight technology, and lightweight, safety, low emission etc. are wanted with auto industry
Ask increasingly harsh, high-strength steel use ratio continues to increase in automobile new model.In order to obtain higher hardness of steel, generally require to add
Add more alloy contents, its carbon equivalent is caused to significantly improve, is bound to cause the deterioration of welding performance and surface quality.Therefore,
The cold-rolled biphase steel with low-carbon-equivalent low yield strength ratio performance is developed, the technology for becoming automobile lightweight urgent need to resolve is asked
Topic.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State the low-carbon-equivalent low yield strength ratio cold-rolled biphase steel and its preparation method and application of problem.
The embodiment of the present invention provides a kind of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel, by weight percentage, the steel
Chemical component is as follows: C:0.06-0.095%, Si:0.1-0.3%, Mn:1.6-1.9%, Cr:0.5-0.8%, Mo:0.1-
0.4%, P≤0.010%, S≤0.005%, Ti:0.01-0.04%, Al:0.02-0.07%, B:0.002-0.005%, it is remaining
Amount is iron and other inevitable impurity elements.
Further, in the steel chemical composition, the weight percent content of C, Mn, Si, P and S meet following condition: C+
Mn/20+Si/30+2P+4S≤0.24。
Further, the steel metallographic structure includes ferrite, martensite and bainite.
Further, by volume percentage, the ferrite content is 38-50%, and the martensite content is 32-
39%, the bainite content is 7-11%.
Based on the same inventive concept, the embodiment of the present invention also provides a kind of system of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel
Preparation Method, including converter smelting, continuous casting, heating, hot rolling, cold rolling, continuous annealing, smooth process；
In the converter smelting, molten steel allotment is carried out with the steel chemical composition；
The heating carries out in heating furnace, wherein heating temperature is 1140-1320 DEG C, time inside furnace 180-
210min；
The hot rolling includes roughing, finish rolling, section cooling, coiling process；The roughing outlet temperature is 950-1020 DEG C,
The finish rolling finishing temperature is 820-900 DEG C；
In the cold rolling, cold rolling reduction ratio is 40-65%.
Further, in the heating, tapping temperature is 1110-1220 DEG C.
Further, in the section cooling, with the cooling rate section cooling of 10-20 DEG C/s to 520-580 DEG C.
Further, the continuous annealing includes bringing-up section, soaking zone, slow cooling section, rapid cooling section and isothermal Wetted constructures,
In the bringing-up section, it is heated to 780-830 DEG C with the rate of 8-16 DEG C/s, the soaking section temperature is described 780-830 DEG C, institute
It states in slow cooling section, is cooled to 640-690 DEG C with the rate of 5-8 DEG C/s, in the rapid cooling section, the hydrogen for being 50% in mass concentration
Under the conditions of, 240-290 DEG C is cooled to 28-38 DEG C/s rate, in the isothermal Wetted constructures, in the 240-290 DEG C of temperature
Degree is lower to handle 8-13min.
Further, it is described it is smooth in, smooth elongation percentage be 0.1-0.3%.
Based on the same inventive concept, the embodiment of the present invention also provides a kind of answering for low-carbon-equivalent low yield strength ratio cold-rolled biphase steel
With applied to automotive safety structure, the safeguard construction includes following at least one: front longitudinal beam, sill strip.
One or more technical solutions in the embodiment of the present invention, have at least the following technical effects or advantages:
Low-carbon-equivalent low yield strength ratio cold-rolled biphase steel provided in an embodiment of the present invention, by weight percentage, the tempering
It studies point as follows: C:0.06-0.095%, Si:0.1-0.3%, Mn:2.0-2.3%, Cr:0.5-0.8%, Mo:0.1-
0.4%, P≤0.010%, S≤0.006%, Ti:0.01-0.04%, Al:0.02-0.07%, B:0.002-0.005%, it is remaining
Amount is iron and other inevitable impurity elements.Reach 980MPa grades with tensile strength, compared with equality strength dual phase steel, carbon
The lower technical effect of equivalent；Due to the addition of microalloy Ti element, welding heat affected zone coarse grains can be effectively reduced, are had
Good welding performance, at the same product have excellent reaming performance, final cold rolling dual phase steel finished product tensile strength 980MPa with
On, yield strength 600-760MPa, 10% or more elongation after fracture, 50% or more hole expansibility can be used for automobile front longitudinal beam, threshold
The safety knots component such as beam.
The preparation method of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel provided in an embodiment of the present invention, including converter smelting,
Continuous casting, heating, hot rolling, cold rolling, continuous annealing, smooth process；By the preparation method, reasonable ingredient is cooperated to design, addition
Suitable Mo makes its more segregation in ferrite, achievees the effect that improve ferrite hardness.In addition, in continuous annealing
Each Phase Proportion of reasonable disposition tissue in journey, introduces suitable bainite, and bainite plays very between ferrite and martensite
Good bridge transition effect, increases phase interface bonding strength, improves reaming performance.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, identical component is indicated with identical reference pattern.In the accompanying drawings:
Fig. 1 is the metallographic structure microscopic observation figure of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel in the embodiment of the present invention 1；
Fig. 2 is low-carbon-equivalent low yield strength ratio cold-rolled biphase steel in existing cold-rolled biphase steel DP780 and the embodiment of the present invention 1
The reaming comparison diagram of DP980.
Specific embodiment
Below in conjunction with specific embodiment and embodiment, it is specifically described the present invention, advantages of the present invention and various effects
It thus will clearly present.It will be understood by those skilled in the art that these specific embodiments and embodiment are for illustrating
The present invention is not intended to limit the present invention.
Throughout the specification, unless otherwise specified, terms used herein are interpreted as usual in this field
Used meaning.Therefore, unless otherwise defined, all technical and scientific terms used herein has leads with belonging to the present invention
The identical meaning of the general understanding of field technique personnel.Contradiction if it exists, this specification are preferential.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention, can pass through
Market is commercially available or can be prepared by existing method.
Technical solution in the embodiment of the present application is in order to solve the above technical problems, general thought is as follows:
The application provides a kind of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel, and by weight percentage, the tempering studies
Divide as follows: C:0.06-0.095%, Si:0.1-0.3%, Mn:2.0-2.3%, Cr:0.5-0.8%, Mo:0.1-0.4%, P≤
0.010%, S≤0.006%, Ti:0.01-0.04%, Al:0.02-0.07%, B:0.002-0.005%, surplus are iron and its
His inevitable impurity element.
In herein described steel chemical composition, the weight percent content of C, Mn, Si, P and S meet following condition: C+Mn/
20+Si/30+2P+4S≤0.24。
In the application, the steel metallographic structure includes ferrite, martensite and bainite.
In the application, by volume percentage, the ferrite content is 38-50%, and the martensite content is 32-
39%, the bainite content is 7-11%.
Based on the same inventive concept, the application also provides a kind of preparation side of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel
Method, including converter smelting, continuous casting, heating, hot rolling, cold rolling, continuous annealing, smooth process；
In the converter smelting, molten steel allotment is carried out with the steel chemical composition；
The heating carries out in heating furnace, wherein heating temperature is 1140-1320 DEG C, time inside furnace 180-
210min:
The hot rolling includes roughing, finish rolling, section cooling, coiling process；The roughing outlet temperature is 950-1020 DEG C,
The finish rolling finishing temperature is 820-900 DEG C；
In the cold rolling, cold rolling reduction ratio is 40-65%.
In herein described heating, tapping temperature is 1110-1220 DEG C.
In herein described section cooling, with the cooling rate section cooling of 10-20 DEG C/s to 520-580 DEG C.
In the application, the continuous annealing includes bringing-up section, soaking zone, slow cooling section, rapid cooling section and isothermal Wetted constructures,
In the bringing-up section, it is heated to 780-830 DEG C with the rate of 8-16 DEG C/s, the soaking section temperature is described 780-830 DEG C, institute
It states in slow cooling section, is cooled to 640-690 DEG C with the rate of 5-8 DEG C/s, in the rapid cooling section, the hydrogen for being 50% in mass concentration
Under the conditions of, 240-290 DEG C is cooled to 28-38 DEG C/s rate, in the isothermal Wetted constructures, in the 240-290 DEG C of temperature
Degree is lower to handle 8-13min.
It is herein described it is smooth in, smooth elongation percentage be 0.1-0.3%.
Based on the same inventive concept, this application also provides a kind of application of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel,
Applied to automotive safety structure, the safeguard construction includes following at least one: front longitudinal beam, sill strip.
Below in conjunction with specific embodiment to the low-carbon-equivalent low yield strength ratio cold-rolled biphase steel and preparation method thereof of the application
It is described in detail with application.
Embodiment 1-4
The low-carbon-equivalent low yield strength ratio cold-rolled biphase steel of the embodiment of the present application 1-4 steel chemical composition (weight percent,
Wt%) as shown in table 1:
Table 1
| Embodiment | C/% | Si/% | Mn/% | P/% | S/% | Cr/% | Mo/% | Alt/% | Ti/% | B/% |
| 1 | 0.082 | 0.18 | 2.23 | 0.008 | 0.002 | 0.55 | 0.18 | 0.028 | 0.019 | 0.0025 |
| 2 | 0.083 | 0.27 | 2.17 | 0.009 | 0.002 | 0.58 | 0.20 | 0.029 | 0.018 | 0.0028 |
| 3 | 0.093 | 0.22 | 2.20 | 0.008 | 0.003 | 0.58 | 0.21 | 0.032 | 0.021 | 0.0030 |
| 4 | 0.092 | 0.25 | 2.18 | 0.007 | 0.001 | 0.60 | 0.22 | 0.042 | 0.022 | 0.0032 |
In the preparation method of the low-carbon-equivalent low yield strength ratio cold-rolled biphase steel of the embodiment of the present application 1-4, heating, hot rolling and cold
The technological parameter rolled is as shown in table 2:
Table 2
| Embodiment | Heating temperature | Finishing temperature | Coiling temperature | Hot rolled thickness | Cold-rolling thickness | Cold rolling reduction ratio |
| 1 | 1182℃ | 884℃ | 535℃ | 3.0mm | 1.5mm | 50% |
| 2 | 1202℃ | 839℃ | 569℃ | 3.0mm | 1.4mm | 47% |
| 3 | 1212℃ | 851℃ | 571℃ | 2.5mm | 1.2mm | 48% |
| 4 | 1202℃ | 874℃ | 557℃ | 2.5mm | 1.1mm | 44% |
In the preparation method of the low-carbon-equivalent low yield strength ratio cold-rolled biphase steel of the embodiment of the present application 1-4, continuous annealing peace
Whole technological parameter is as shown in table 3:
Table 3
Low-carbon-equivalent low yield strength ratio cold-rolled biphase steel made from the embodiment of the present application 1-4 is sampled and carries out mechanical property survey
Examination, test result are as shown in table 4:
Table 4
| Embodiment | Rm/MPa | Rp0.2/MPa | A80/% | Hole expansibility/% | Pcm |
| 1 | 998 | 691 | 11 | 54 | 0.2235 |
| 2 | 989 | 689 | 12 | 60 | 0.2265 |
| 3 | 1002 | 674 | 12.5 | 55 | 0.2383 |
| 4 | 1028 | 692 | 12 | 56 | 0.2273 |
Embodiment 5
In the present embodiment, the low-carbon-equivalent low yield strength ratio cold-rolled biphase steel is applied to automotive safety structure, the peace
Full structure includes following at least one: front longitudinal beam, sill strip.
As shown in Fig. 1, the metallographic structure of 1 low-carbon-equivalent low yield strength ratio cold-rolled biphase steel sample of the embodiment of the present invention includes
Ferrite, martensite and a small amount of bainite.
As shown in Fig. 2, in the embodiment of the present invention 1 low-carbon-equivalent low yield strength ratio cold-rolled biphase steel DP980 compared to existing
Cold-rolled biphase steel DP780, with the technical advantage that hole expansibility is high in terms of reaming.
Finally, it is to be noted that, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive
Property include so that include a series of elements process, method, article or equipment not only include those elements, but also
Further include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsic
Element.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel, which is characterized in that by weight percentage, the steel chemical composition
It is as follows: C:0.06-0.095%, Si:0.1-0.3%, Mn:1.6-1.9%, Cr:0.5-0.8%, Mo:0.1-0.4%, P≤
0.010%, S≤0.005%, Ti:0.01-0.04%, AI:0.02-0.07%, B:0.002-0.005%, surplus are iron and its
His inevitable impurity element.
2. a kind of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel according to claim 1, which is characterized in that the tempering
In ingredient, the weight percent content of C, Mn, Si, P and S meet following condition: C+Mn/20+Si/30+2P+4S≤0.24.
3. a kind of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel according to claim 1, which is characterized in that the steel metallographic
Tissue includes ferrite, martensite and bainite.
4. a kind of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel according to claim 3, which is characterized in that press volume basis
Than meter, the ferrite content is 38-50%, and the martensite content is 32-39%, and the bainite content is 7-11%.
5. a kind of preparation method of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel, which is characterized in that including converter smelting, continuous casting,
Heating, hot rolling, cold rolling, continuous annealing, smooth process；
In the converter smelting, molten steel allotment is carried out with the steel chemical composition；
The heating carries out in heating furnace, wherein heating temperature is 1140-1320 DEG C, time inside furnace 180-210min:
The hot rolling includes roughing, finish rolling, section cooling, coiling process；The roughing outlet temperature is 950-1020 DEG C, described
Finish rolling finishing temperature is 820-900 DEG C；
In the cold rolling, cold rolling reduction ratio is 40-65%.
6. a kind of preparation method of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel according to claim 5, which is characterized in that
In the heating, tapping temperature is 1110-1220 DEG C.
7. a kind of preparation method of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel according to claim 5, which is characterized in that
In the section cooling, with the cooling rate section cooling of 10-20 DEG C/s to 520-580 DEG C.
8. a kind of preparation method of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel according to claim 5, which is characterized in that
The continuous annealing includes bringing-up section, soaking zone, slow cooling section, rapid cooling section and isothermal Wetted constructures, in the bringing-up section, with 8-
The rate of 16 DEG C/s is heated to 780-830 DEG C, and the soaking section temperature is described 780-830 DEG C, in the slow cooling section, with 5-8
DEG C/rate of s is cooled to 640-690 DEG C, in the rapid cooling section, in the case where mass concentration is 50% hydrogen atmosphere, with 28-38
DEG C/s rate is cooled to 240-290 DEG C, in the isothermal Wetted constructures, 8- is handled at a temperature of described 240-290 DEG C
13min。
9. a kind of preparation method of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel according to claim 5, which is characterized in that
It is described it is smooth in, smooth elongation percentage be 0.1-0.3%.
10. a kind of application of low-carbon-equivalent low yield strength ratio cold-rolled biphase steel, which is characterized in that be applied to automotive safety structure, institute
It includes following at least one for stating safeguard construction: front longitudinal beam, sill strip.
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Cited By (4)
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| CN111607731A (en) * | 2020-05-19 | 2020-09-01 | 新余钢铁股份有限公司 | Cold-rolled dual-phase steel with improved hole expanding performance and manufacturing method thereof |
| CN111647732A (en) * | 2020-05-11 | 2020-09-11 | 首钢集团有限公司 | 1300 MPa-grade complex phase steel, preparation method and application thereof |
| CN111910123A (en) * | 2020-07-13 | 2020-11-10 | 首钢集团有限公司 | Cold-rolled continuous annealing ultrahigh-strength steel with excellent phosphating performance and preparation method thereof |
| CN113106346A (en) * | 2021-04-12 | 2021-07-13 | 达力普石油专用管有限公司 | High-strength seamless line pipe and preparation method thereof |
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