CN108486500A - A kind of cold rolling hot dip galvanizing Multiphase Steel and preparation method thereof - Google Patents
A kind of cold rolling hot dip galvanizing Multiphase Steel and preparation method thereof Download PDFInfo
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- CN108486500A CN108486500A CN201810459470.2A CN201810459470A CN108486500A CN 108486500 A CN108486500 A CN 108486500A CN 201810459470 A CN201810459470 A CN 201810459470A CN 108486500 A CN108486500 A CN 108486500A
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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
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention relates to a kind of cold rolling hot dip galvanizing Multiphase Steel, chemical component weight percentage is respectively：C 0.05 0.13%, Si 0.1 0.5%, Mn 1.5 2.5%, P≤0.015%, S≤0.015%, Al 0.1 0.6%, Cr 0.2 0.6%, Mo 0.1 0.5%, Nb 0.01 0.06%, Ti 0.01 0.06%, surplus are Fe and inevitable impurity.The invention further relates to a kind of preparation methods of cold rolling hot dip galvanizing Multiphase Steel, include the following steps：Molten steel is cast as steel billet；The steel billet obtains hot rolled plate by hot rolling, and the hot rolled plate obtains chill strip through cold rolling；The chill strip handles to obtain cold rolling hot dip galvanizing Multiphase Steel finished product by continuous zinc coating annealing process.The present invention makes cold rolling hot dip galvanizing Multiphase Steel improve buckling performance on the basis of meeting intensity requirement.
Description
Technical field
The invention discloses a kind of cold rolling hot dip galvanizing Multiphase Steels and preparation method thereof, belong to cold rolling hot dip galvanizing Multiphase Steel technology
Field.
Background technology
Recently as the needs of development and the energy-saving and emission-reduction of automobile industry, automobile steel gradually develops to high strength steel,
The formation of parts such as the bending flange of high strength steel application simultaneously are increasing.Traditional high-strength steel is mainly dual phase steel, tissue
It is mainly made of the softer higher martensite of ferrite matrix and intensity, the performance characteristics of this tissue are lower bend by force
Than, higher intensity etc., it is appropriate for the production of stamping part；But due to ferrite and the soft or hard phase difference of hardness of martensite compared with
Greatly, bending property and reaming performance are relatively low, cannot meet the production of flange bending and forming part.Therefore, it is necessary to ferrite+
Bainite is introduced in martensite two-phase section, while by martensite Dispersed precipitate on ferrite matrix, the surrender for improving material is strong
Degree, buckling performance and reaming performance also improve therewith, meet the production of flange bending and forming part.
Invention content
In order to solve the above technical problems, a kind of cold rolling hot dip galvanizing Multiphase Steel of present invention offer and preparation method thereof, makes cold
It rolls galvanizing Multiphase Steel and improves buckling performance and reaming performance on the basis of meeting intensity requirement.
An aspect of of the present present invention is related to a kind of cold rolling hot dip galvanizing Multiphase Steel, and chemical component weight percentage is respectively：C
0.05-0.13%, Si 0.1-0.5%, Mn 1.5-2.5%, P≤0.015%, S≤0.015%, Al 0.1-0.6%, Cr
0.2-0.6%, Mo 0.1-0.5%, Nb 0.01-0.06%, Ti 0.01-0.06%, surplus be Fe and inevitably it is miscellaneous
Matter.
Another aspect of the present invention relates to a kind of preparation method of cold rolling hot dip galvanizing Multiphase Steel, chemical component weight percentages
Than being respectively：C 0.05-0.13%, Si 0.1-0.5%, Mn 1.5-2.5%, P≤0.015%, S≤0.015%, Al
0.1-0.6%, Cr 0.2-0.6%, Mo 0.1-0.5%, Nb 0.01-0.06%, Ti 0.01-0.06%, surplus be Fe and
Inevitable impurity；It the described method comprises the following steps：
(1) molten steel of the ingredient is cast as steel billet；
(2) steel billet obtains hot rolled plate by hot rolling；
(3) hot rolled plate obtains chill strip through cold rolling；
(4) the chill strip handles to obtain cold rolling hot dip galvanizing Multiphase Steel finished product by continuous zinc coating annealing process.
The detailed description of the invention
The present invention provides a kind of cold rolling hot dip galvanizing Multiphase Steel, chemical component weight percentage is respectively：C 0.05-
0.13%, Si 0.1-0.5%, Mn 1.5-2.5%, P≤0.015%, S≤0.015%, Al 0.1-0.6%, Cr 0.2-
0.6%, Mo 0.1-0.5%, Nb 0.01-0.06%, Ti 0.01-0.06%, surplus are Fe and inevitable impurity.
It is effect and its restriction explanation of key component according to the present invention below：
Carbon：Carbon is Ovshinsky element of volume, and the height of carbon content largely determines the tensile strength rank of steel plate, is shadow
The critically important index of carbon equivalent is rung, ensures that there is good formability while the tensile strength of material reaches prescribed level,
Thus the carbon content of the present invention is not less than 0.05%, good solderable to ensure while ensuring intensity not higher than 0.13%
Connecing property.
Silicon：Silicon plays solution strengthening effect in steel, and when content is more can inhibit the precipitation of carbide, promote ferrite
Formed, to make in carbon spread to retained austenite, ensure material have certain plasticity, but Si constituent contents no more than
0.5%, excessively high Si elements can lead to the decline of galvanizing surface quality.
Manganese：Manganese plays solution strengthening effect in steel, can improve the intensity of steel plate after quenching.Manganese is the member of stable austenite
Element can reduce the phase transition temperature of austenite, promote dissolving of the carbon in austenite.Excessively high manganese content level must avoid, because
The activity that carbon in austenite is reduced for manganese, promotes the formation of carbide in this way.The inhibition of ferrite transformation must be given
To consider, because it can be preferably minimized the enrichment of carbon in cooling procedure.Excessively high manganese is also easy to be segregated, and deteriorates the property of steel
Energy.In consideration of it, the content of manganese is set between 1.5% to 2.5%.About silicon and manganese, it is necessary to adjust the relative quantity of addition to control
The distribution of phase processed and volume fraction.
P and s：P and s are the harmful elements in steel.Phosphorus seriously damages the plasticity and toughness of steel plate；Sulphur in steel with manganese
Equal chemical combination form plastic occluded foreignsubstance manganese sulfide, especially unfavorable to the horizontal plastic property of steel and toughness, therefore the content of sulphur should be as far as possible
It is low.Other components in steel cannot inhibit and reduce the adverse effect of p and s.
Aluminium：Aluminium mainly plays deoxidation in liquid steel.In addition, the aluminium of proper content can also accelerate bainite transformation, energy
It is enough that bainite is formed in limiting time.Aluminium also hinders the formation of carbide, and carbon is retained in the melt, to promote austenite
Stabilization.For this purpose, the content of aluminium is set between 0.1% to 0.6%.
Niobium：Niobium is strong carbon compound formation element, can delay hot rolling Austenite Recrystallization Process.Due to adding in steel
Enter suitable titanium, the formation temperature of titanium and nitrogen is higher, therefore passes through the content for controlling titanium, nitrogen so that the main carburet of niobium.Gu
The niobium of molten state delays static and dynamic recrystallization in thermal deformation process, improves non-recrystallization temperature, and refinement is contributed to be formed
The phase-change product of austenite.The content of niobium is less than 0.01% intensity for influencing steel, increases production cost higher than 0.06%.
Titanium：The effect of titanium is similar to niobium.Titanium can form the compound of titanium with nitrogen, carbon and sulphur.The content of titanium in steel is controlled,
Niobium carbonitrides Second Phase Precipitation is formed, the matrix of steel is strengthened.The content of titanium is less than 0.01% intensity for influencing steel, is higher than
0.06% increases production cost.
Chromium：The effect of chromium mainly improves the quenching degree of steel, ensures the intensity of material.Chromium forms ferritic while enhancing
The formation of retained austenite, thus, the content of chromium is not less than 0.2%, otherwise influences the quenching degree of steel；Also it should not be greater than
0.6%, to ensure cost economy.
Molybdenum：The effect of molybdenum mainly improves the temper resistance of martensite, and the through hardening of steel is enough improved with Cr element binding energies
Property, while can be with crystal grain thinning, and the stability of austenite is improved, improve the strength of materials.The content of molybdenum is no not less than 0.1%
Then influence the quenching degree of steel；Also 0.5% is should not be greater than, to ensure cost economy.
The above element comprehensive function ensures that the performance of material meets the requirement of standard.
In the present patent application, ingredient C, Si, Mn is basic steel and alloy ingredient.Cr+Mo element combinations can carry
The quenching degree of high material ensures the intensity of material.
In certain embodiments of the present invention, Cr+Mo constituent contents preferred scope is 0.3-0.6%.
Nb+Ti is the microalloy element of addition, and tiny NbC, TiC precipitated phase can be precipitated in ferrite matrix, is carried out
Crystal grain refinement and precipitation strength, thinning microstructure structure, while reinforced ferrite improve the yield strength of material, ensure martensite
With bainite on ferrite matrix Dispersed precipitate.
In certain embodiments of the present invention, Nb+Ti constituent contents preferred scope is 0.03-0.06%, too low to carry
It is excessively high for adequately refining and strengthening effect, cause precipitated phase excessive, reduces precipitating reinforcing effect.
In certain embodiments of the present invention, the internal microstructure of the cold rolling hot dip galvanizing Multiphase Steel is ferrite+shellfish
Family name's body+martensite.
Further, the internal microstructure of the cold rolling hot dip galvanizing Multiphase Steel is 50~70% iron element by volume fraction
Body, 20~30% bainites and 10~20% martensites composition.The organization type of the ratio can guarantee that the cold rolling hot dip galvanizing is multiple
Phase steel improves buckling performance on the basis of meeting intensity requirement.
In certain embodiments of the present invention, tensile strength >=780MPa of the cold rolling hot dip galvanizing Multiphase Steel, surrender are strong
Degree >=550MPa, elongation percentage A50 >=13%.
The preparation method of cold rolling hot dip galvanizing Multiphase Steel of the present invention, chemical component weight percentage are respectively：C
0.05-0.13%, Si 0.1-0.5%, Mn 1.5-2.5%, P≤0.015%, S≤0.015%, Al 0.1-0.6%, Cr
0.2-0.6%, Mo 0.1-0.5%, Nb 0.01-0.06%, Ti 0.01-0.06%, surplus be Fe and inevitably it is miscellaneous
Matter；It the described method comprises the following steps：
(1) molten steel of the ingredient is cast as steel billet；
(2) steel billet obtains hot rolled plate by hot rolling；
(3) hot rolled plate obtains chill strip through cold rolling；
(4) the chill strip handles to obtain cold rolling hot dip galvanizing Multiphase Steel finished product by continuous zinc coating annealing process.
It is described in step (2) in the present invention prepares certain specific embodiments of the cold rolling hot dip galvanizing Multiphase Steel
The heating temperature of steel billet is 1100-1300 DEG C；Its hot rolling finishing temperature is 850-910 DEG C；Its hot-rolling coiling temperature is 620-670
℃。
It is described in step (3) in the present invention prepares certain specific embodiments of the cold rolling hot dip galvanizing Multiphase Steel
The cold rolling reduction ratio of steel billet is 50%-75%.
In the present invention prepares certain specific embodiments of the cold rolling hot dip galvanizing Multiphase Steel, in step (4), by institute
It states chill strip and is preheated to 220 DEG C；It reheats, in 760 DEG C of -820 DEG C of heat preservations.
In the present invention prepares certain specific embodiments of the cold rolling hot dip galvanizing Multiphase Steel, in step (4), it will protect
To 660 DEG C -740 DEG C, cooling rate is 10~20 DEG C/s for strip slow cooling after temperature.Slow cooling temperature can promote in ferrite C to
It is enriched in austenite, purifies quenching degree that is ferritic while improving austenite.Cooling rate can adjust ferritic ratio,
Obtain different mechanical properties.
In the present invention prepares certain specific embodiments of the cold rolling hot dip galvanizing Multiphase Steel, in step (4), by institute
State the strip after slow cooling through it is high it is hydrogen-cooled to be but cooled to zinc-plated temperature soon be 450-460 DEG C, cooling rate is 20~40 DEG C/s.Zinc-plated knot
Shu Houjing is cooled to 410-430 DEG C；The strip air-cooled cooling after zinc-plated, cooling tower top roll temperature are 250-300 DEG C.Rapid cooling
Temperature ensures the formation of bainite and martensite, ensures the intensity of material.The content of rapid cooling rate adaptation bainite and martensite,
Obtain different mechanical properties.
The present invention ensure cold rolling hot dip galvanizing Multiphase Steel tensile strength reach 780MPa grades under the premise of, add appropriate Cr,
Mo members usually ensure quenching degree；It reduces C content and ensures welding quality；The appropriate Si constituent contents that reduce are added with meeting galvanizing quality
Si is substituted with appropriate Al to all can serve as higher content intensified element although Al elements are similar with Si element interactions, simultaneously promote
It is enriched with into C element in ferrite to austenite and purifies ferrite, improve Multiphase Steel ductility, but Si elements are easy to gather on surface
Collection forms refractory oxide and reduces galvanizing quality, therefore replaces with Al elements；It is thin to add appropriate Nb, Ti element progress crystal grain
Change and precipitation strength, thinning microstructure structure, while reinforced ferrite, improve the yield strength and welding performance of material, bending
It also can therewith be improved with reaming performance.Using mentioned component design and preparation method, the steel plate with excellent performance can get.
Description of the drawings
Fig. 1 is the microstructure picture for the cold rolling hot dip galvanizing Multiphase Steel that the embodiment of the present invention 1 provides.
Embodiment
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
Test method：
Yield strength, tensile strength and the elongation percentage of the cold rolling hot dip galvanizing Multiphase Steel are measured by GB/T 228.
In smelting process：Through molten iron pre-desulfurization, bessemerizes, steel billet obtained using continuous casting mode after RH vacuum refinings.Its
In, the cold rolling hot dip galvanizing complex phase steel chemical composition of the embodiment of the present application is as shown in table 1.
The cold rolling hot dip galvanizing complex phase composition of steel (weight percent %) of 1 embodiment 1-15 of table
The technology controlling and process that the embodiment of the present application prepares cold rolling hot dip galvanizing Multiphase Steel is as shown in table 2.
2 embodiment 1-15 of table prepares the process parameter control of cold rolling hot dip galvanizing Multiphase Steel
The characterization of finished steel
The mechanical property of the cold rolling hot dip galvanizing Multiphase Steel of 3 embodiment 1-15 of table
Fig. 1 is the microstructure picture for the cold rolling hot dip galvanizing Multiphase Steel that the embodiment of the present invention one provides.Picric acid is used
Sodium Metabisulfite solution corrosion, wherein grey are ferrite matrix, and black is bainite structure, and brilliant white is that horse is (MA) difficult to understand
Island.It can be seen from the figure that ferrite shows the polygon of rule in microscopic structure of the embodiment of the present invention, can be Multiphase Steel
Sufficient ductile deformation is provided；The presence on the islands certain proportion MA can provide higher intensity for Multiphase Steel；Appropriate bainite
In the presence of, as the transitional face between soft phase ferrite and hard phase martensite, can further increase Multiphase Steel buckling performance and
Reaming performance.It should be noted that tensile strength 780MPa grade cold rolling hot dip galvanizing Multiphase Steels provided in an embodiment of the present invention is aobvious
Martensite and bainite Dispersed precipitate further improve the bending and forming ability of material on ferrite matrix in micro-assembly robot.
As the difference of annealing process slightly has difference, but MA rates substantially remain in 15% or so, and all there is bainite structure.
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, those skilled in the art can be to the present invention
Carry out various modification and variations without departing from the spirit and scope of the present invention.If in this way, these modifications and changes of the present invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to exist comprising these modification and variations
It is interior.
Claims (10)
1. a kind of cold rolling hot dip galvanizing Multiphase Steel, chemical component weight percentage are respectively：C 0.05-0.13%, Si 0.1-
0.5%, Mn 1.5-2.5%, P≤0.015%, S≤0.015%, Al 0.1-0.6%, Cr 0.2-0.6%, Mo 0.1-
0.5%, Nb 0.01-0.06%, Ti 0.01-0.06%, surplus are Fe and inevitable impurity.
2. cold rolling hot dip galvanizing Multiphase Steel as described in claim 1, which is characterized in that the cold rolling hot dip galvanizing Multiphase Steel it is interior
Portion's microscopic structure is ferrite+bainite+martensite.
3. cold rolling hot dip galvanizing Multiphase Steel as described in claim 2, which is characterized in that the cold rolling hot dip galvanizing Multiphase Steel it is interior
Portion's microscopic structure is that 50~70% ferrites, 20~30% bainites and 10~20% martensites form by volume fraction.
4. cold rolling hot dip galvanizing Multiphase Steel as described in claim 1, which is characterized in that the cold rolling hot dip galvanizing Multiphase Steel resists
Tensile strength >=780MPa, yield strength >=550MPa, elongation percentage A50 >=13%.
5. a kind of preparation method of cold rolling hot dip galvanizing Multiphase Steel, chemical component weight percentage are respectively：C 0.05-
0.13%, Si 0.1-0.5%, Mn 1.5-2.5%, P≤0.015%, S≤0.015%, Al 0.1-0.6%, Cr 0.2-
0.6%, Mo 0.1-0.5%, Nb 0.01-0.06%, Ti 0.01-0.06%, surplus are Fe and inevitable impurity；Institute
The method of stating includes the following steps：
(1) molten steel of the ingredient is cast as steel billet；
(2) steel billet obtains hot rolled plate by hot rolling；
(3) hot rolled plate obtains chill strip through cold rolling；
(4) the chill strip handles to obtain cold rolling hot dip galvanizing Multiphase Steel finished product by continuous zinc coating annealing process.
6. the preparation method of cold rolling hot dip galvanizing Multiphase Steel as claimed in claim 5, which is characterized in that described in step (2)
The heating temperature of steel billet is 1100-1300 DEG C；Its hot rolling finishing temperature is 850-910 DEG C；Its hot-rolling coiling temperature is 620-670
℃。
7. the preparation method of cold rolling hot dip galvanizing Multiphase Steel as claimed in claim 5, which is characterized in that described in step (3)
The cold rolling reduction ratio of steel billet is 50%-75%.
8. the preparation method of cold rolling hot dip galvanizing Multiphase Steel as claimed in claim 5, which is characterized in that in step (4), by institute
It states chill strip and is preheated to 220 DEG C；It reheats, in 760 DEG C of -820 DEG C of heat preservations.
9. the preparation method of cold rolling hot dip galvanizing Multiphase Steel as claimed in claim 5, which is characterized in that in step (4), by institute
The strip slow cooling after heat preservation is stated to 660 DEG C -740 DEG C, cooling rate is 10~20 DEG C/s.
10. the preparation method of cold rolling hot dip galvanizing Multiphase Steel as claimed in claim 5, which is characterized in that, will in step (4)
Strip after the slow cooling through it is high it is hydrogen-cooled to be but cooled to zinc-plated temperature soon be 450-460 DEG C, cooling rate is 20~40 DEG C/s.It is zinc-plated
After be cooled to 410-430 DEG C；The strip air-cooled cooling after zinc-plated, cooling tower top roll temperature are 250-300 DEG C.
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Cited By (15)
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| CN109023106A (en) * | 2018-09-25 | 2018-12-18 | 首钢集团有限公司 | A kind of cold rolling hot dip galvanizing Multiphase Steel and preparation method thereof |
| CN109594020A (en) * | 2018-12-28 | 2019-04-09 | 首钢集团有限公司 | A kind of tensile strength 1000MPa grades of cold rolling Multiphase Steels and preparation method thereof |
| CN110093491A (en) * | 2019-05-17 | 2019-08-06 | 中冶赛迪工程技术股份有限公司 | A kind of cold-rolled galvanized duplex steel and its manufacturing method |
| CN110129668A (en) * | 2019-04-25 | 2019-08-16 | 首钢集团有限公司 | A kind of 1000MPa grades of alloyed zinc hot dip galvanized Multiphase Steel and preparation method thereof |
| CN110629115A (en) * | 2019-10-21 | 2019-12-31 | 山东钢铁集团日照有限公司 | Economical cold-rolled CP800 steel with different yield strength grades and production method thereof |
| CN110724877A (en) * | 2019-10-30 | 2020-01-24 | 鞍钢股份有限公司 | 1180MPa grade high-plasticity bainite complex phase steel plate for automobile and preparation method thereof |
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| CN111945061A (en) * | 2020-07-13 | 2020-11-17 | 首钢集团有限公司 | 1180MPa cold-rolled hot-galvanized dual-phase steel and preparation method thereof |
| CN111979488A (en) * | 2020-09-07 | 2020-11-24 | 鞍钢股份有限公司 | 780 MPa-grade alloying hot-dip galvanized DH steel and preparation method thereof |
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| CN112048680A (en) * | 2020-09-07 | 2020-12-08 | 鞍钢股份有限公司 | Alloyed hot-dip galvanized DH980 steel and preparation method thereof |
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| CN113249646A (en) * | 2021-04-15 | 2021-08-13 | 首钢集团有限公司 | High-strength-plasticity hot-base galvanized medium manganese steel sheet and preparation method thereof |
| CN113604728A (en) * | 2021-06-24 | 2021-11-05 | 武汉钢铁有限公司 | High-surface-quality hot-galvanized high-strength steel and manufacturing method thereof |
| CN115612816A (en) * | 2022-09-30 | 2023-01-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for preparing complex phase steel and steel plating plate for hot forming from boron-containing steel |
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