CN105369135B - A kind of 450MPa levels car Galvanized Dual Phase Steel and production method - Google Patents
A kind of 450MPa levels car Galvanized Dual Phase Steel and production method Download PDFInfo
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- CN105369135B CN105369135B CN201510968622.8A CN201510968622A CN105369135B CN 105369135 B CN105369135 B CN 105369135B CN 201510968622 A CN201510968622 A CN 201510968622A CN 105369135 B CN105369135 B CN 105369135B
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- 229910000885 Dual-phase steel Inorganic materials 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 23
- 239000011701 zinc Substances 0.000 claims abstract description 23
- 238000005097 cold rolling Methods 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 238000005246 galvanizing Methods 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 238000005554 pickling Methods 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 19
- 238000000137 annealing Methods 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 229910000734 martensite Inorganic materials 0.000 claims description 8
- 229910000859 α-Fe Inorganic materials 0.000 claims description 7
- 238000007792 addition Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000002310 reflectometry Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 10
- 238000000576 coating method Methods 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 8
- 230000005764 inhibitory process Effects 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 abstract description 3
- 241001062472 Stokellia anisodon Species 0.000 abstract 1
- 238000009749 continuous casting Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 239000004411 aluminium Substances 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Coating With Molten Metal (AREA)
Abstract
A kind of 450MPa levels car Galvanized Dual Phase Steel, its component and wt% are：C：0.04~0.09%, Si：≤ 0.01%, Mn：1.0~2.0%, P：≤ 0.015%, S：≤ 0.010%, Als：0.01~0.08%, Mo 0.01 ~ 0.30%, Cr 0.01 ~ 1.0%, Nb：0.001 ~ 0.03%, N：≤ 0.005%；Production stage：Through smelt, refine and continuous casting after to heating strand；Finish rolling；Batch；Cold rolling after pickling；Galvanizing；Finishing.Product mechanical property of the present invention reaches：260~320MPa of yield strength, 470~510MPa of tensile strength, elongation percentage 28 ~ 33%, n values 0.17 ~ 0.19, and product platability is good, coating surface uniform color zero defect, inhibition layer is continuously fine and close, and Zinc attachability reaches ball and rushes 1 grade of level, zinc layers and base steel bend test are qualified, and intermediate car can be met to high strength structure part and the surface quality requirements of outer covering piece.
Description
Technical field
The present invention relates to a kind of automobile using galvanized steel and method, specifically belongs to a kind of zinc-plated two-phase of 450MPa levels car
Steel and production method.
Background technology
With the continuous improvement that the continuous development of automotive light weight technology and occupant safety require, high-strength steel is in automobile in recent years
Ratio and dosage in white body quickly increase, and dual phase steel is more next because it has high intensity, low yield strength ratio and good formability
More favored by auto industry circle, application percentage is improving constantly on automobile.Compared with cold-rolled biphase steel, Galvanized Dual Phase Steel
Also there is excellent antiseptic property, can guarantee that automobile has good corrosion resistant piercing capability, be mainly used at present middle-and-high-ranking
The structural member and reinforcer of car, great surface quality Galvanized Dual Phase Steel apply also for Car panel.Great surface quality is zinc-plated
Dual phase steel is on the premise of mechanical property is ensured, the surface quality such as substrate platability, surface defect level, Zinc attachability rank
Index also has higher requirement.At present, in the actual production of great surface quality Galvanized Dual Phase Steel, due to Si members in composition design
Cellulose content is higher, Partial key technique does not carry out the reasons such as strict control, plating leakage, exceeded, the zinc layers bending dezincification of surface defect etc.
Problem occurs often.
Through retrieval, Chinese Patent Application No. is 201220277421.X document, and it discloses a kind of " tensile strength
450MPa levels dual-phase steel plate and its manufacture method ", it uses C-Si-Mn-Cr component systems to bear one kind
450MPa level cold-rolled biphase steels, due to Si elements in annealing process easily in surface enrichment, thus be not suitable for producing high surface
The Galvanized Dual Phase Steel of quality.
The content of the invention
The present invention exists in view of the deficienciess of the prior art, providing a kind of yield strength in 260~320MPa, tensile strength
470~510MPa, elongation percentage are 0.17 ~ 0.19 in 28 ~ 33%, n values, and platability is good, coating surface uniform color zero defect and zinc
The excellent car Galvanized Dual Phase Steel of layer adhesive force and production method.
Realize the measure of above-mentioned purpose：
A kind of 450MPa levels car Galvanized Dual Phase Steel, its component and weight percent content are：C：0.04~0.09%,
Si：≤ 0.01%, Mn：1.0~2.0%, P：≤ 0.015%, S：≤ 0.010%, Als：0.01~0.08%, Mo 0.01 ~
0.30%, Cr 0.01 ~ 1.0%, Nb：0.001 ~ 0.03%, N：≤ 0.005%, remaining is iron and other inevitable impurity；Metallographic
It is organized as：Ferrite and martensite.
It is：Mo and the compound additions of Cr, wherein Cr addition substitute 0.1%Mo meters according to 0.2 ~ 0.3%Cr, and control
Cr+Mo≤1.0% processed.
Produce a kind of method of 450MPa levels car Galvanized Dual Phase Steel, its step：
1）By set composition after smelting, refining and be casting continuously to form strand, strand is heated, heating and temperature control exists
1190~1250℃；
2）Finish rolling is carried out, controls its finishing temperature at 890~920 DEG C；
3）Batched：Oiler temperature control is at 580~620 DEG C；
4）Cold rolling is carried out after pickling：Pickling temperature is controlled at 70~90 DEG C, and the acid number in sour pond is not less than 40g/l；Control
Cold rolling total reduction is 45~75%；And control surface of steel plate reflectivity≤60%；
5）Carry out galvanizing：In the case where ensuring to enter annealing furnace front spring clean surface, annealed, control annealing temperature exists
770~810 DEG C, dew point control is below -40 DEG C in annealing furnace, oxygen content≤3ppm；Zinc liquid temperature is controlled 455~465
DEG C, aluminium content control is in 0.18~0.23%, Fe%≤0.009% in zinc liquid；
6）Carry out finishing：Finishing elongation control is 0.7~1.1%.
The effect of each element in the present invention
C：Carbon in dual phase steel significantly affects all phase transition process no longer based on solution strengthening, and controls
Final microstructure and mechanical property, to ensure to separate out finished product mechanical property favourable larger ferrite the shape of area and martensitic phase
Looks and hardness, carbon content can not be too high；Meanwhile carbon content has significant impact to galvanizing in steel, phosphorus content is higher, iron-zinc
Reaction is more violent, and the weight loss of iron is bigger, while fe-zn alloy layer is thicker so that zinc coat adhesiveness degenerates and easily made
There is list edge defect into zinc surface；Other carbon content also has a great impact to welding performance, although after being welded vehicle stiffness
The intensity of steel used is heavily dependent on, but due to being connected mostly using solder joint between part and part, thus weld
The intensity of point is also the important indicator of complete automobile collision security, and for consideration in this respect, many automobile factorys are intended to dual phase steel
Carbon content control within 0.1%.In summary consider, carbon content range set of the present invention is 0.04~0.09%.
Si：For hot dip galvanized dual phase steel, Si elements easily form SiO in annealing in belt steel surface enrichment oxidation2
Oxide-film, it is difficult to by hydrogen reducing, so as to reduce zinc-plated wellability, plating leakage, pin hole, Zinc attachability is caused the coating such as not to conform to
Defect, while Si elements also have harmful effect to the spot welding characteristics of galvanized sheet, therefore in order to reduce silicon to greatest extent to surface
The influence of quality, application claims control Si constituent contents within 0.01%.
Mn：Mn is typical austenite stabilizer element, can postpone pearlite and bayesian as the element for expanding γ phase regions
The formation of body, the quenching degree of steel is improved, promote to form martensite in rapid cooling cooling procedure, and play solution strengthening and refinement iron element
The effect of body crystal grain, but Mn can be oxidized and deposit in steel strip surface in annealing process, and excessive Mn will deteriorate zinc-plated infiltration
Property, therefore the present invention controls Mn contents in the range of 1.0 ~ 2.0%.
P、S：S, P is impurity element, and P is prone to be segregated, and makes dual phase steel that phase boundary embrittlement occur, causes brittle fracture, S
Welding performance is adversely affected, while forms field trash to reduce the fatigue behaviour of steel, therefore application claims P≤
0.015%, S≤0.010%.
Als：Aluminium adds for deoxidation, when Als contents are less than 0.010%, it is impossible to play its effect；The opposing party
Face, because the aluminium for adding volume easily forms aluminum oxide agglomerate, so, it is specified that the Als upper limits are 0.08%.
Mo、Cr：Addition Mo, Cr can be such that CCT curve substantially moves to right, and strong inhibition pearlite and bainite transformation, be advantageous to
Martensitic structure is obtained in Continuous Hot Dip Galvanizing Line.But the price of Mo alloys is costly, to reduce cost, it is also possible to Cr
To replace part Mo, 0.1%Mo can be substituted with 0.2 ~ 0.3%Cr in general；Further, since the generation of Cr, Mo oxide
Gibbs free energy is higher than the oxides such as Mn, Si, P, so surface oxidation is not susceptible to when galvanizing is annealed, also without table
Face segregation phenomena, therefore the wellability of zinc liquid is not interfered with, but it must is fulfilled for the condition of Cr+Mo≤1.0%.
Nb：Nb plays remarkable effect to C enrichments in crystal grain refinement, transformation behavior, austenite.The Nb delayed heats of solid solution condition
Static and dynamic recrystallization and austenite are to ferritic phase transformation in deformation process, so as to expand between recrystallization temperature and Ac3
Temperature range, be Unhydrated cement final rolling temperature determine provide convenience.Nb also promotees while fining ferrite grains
Enter the refinement of martensitic phase and be uniformly distributed, be greatly enhanced the performance uniformity of steel, but the Nb of excessive addition can cause iron
Nb carbonitride is separated out in ferritic, significantly improves the yield strength of finished product, it is unnecessary to stamping unfavorable and increase into
This, therefore application claims control Nb content in the range of 0.001 ~ 0.03%.
N：N is more few better in steel, therefore requires N≤0.005%
In the technique of the present invention：
Why slab heating temperature is controlled at 1190 ~ 1250 DEG C, its reason can be ensured in this temperature range
All alloying elements are dissolved, and ensure the control of follow-up final rolling temperature；
Why final rolling temperature is controlled at 890~920 DEG C, its reason is that finishing temperature is less than less than 890 DEG C, hot rolling temperature
Degree somewhat fluctuation is possible to enter two-phase section rolling, easily produces mixed grain structure, and this uneven brilliant tissue has heredity
Property, also it is not easy to eliminate even if by cold rolling and annealing, the inhomogeneities of tissue is except can produce the uniformity of mechanical property
Outside influenceing, the uniformity of galvanizing surface can also be had an impact；
Why by oiler temperature control at 580~620 DEG C, its reason is that hot rolling coiling temperature is too high（620 DEG C of ＞）, hold
It is easily caused hot-rolled substrate coarse grains and banded structure occurs, hot-rolled substrate tissue can be effectively improved by reducing coiling temperature
Uniformity, make the crystal grain of hot-rolled substrate fine and smooth uniformly, so as to improve hot rolling banded structure, and then reduce cold rolling recrystal grain chi
It is very little so that cold rolled annealed tissue is more uniform.
Why pickling temperature is controlled at 70~90 DEG C, the acid number requirement in sour pond is not less than 40g/l, and its reason is effective
Ensure that the iron scale of hot rolling plate surface thoroughly cleans up, avoid residual oxidization iron sheet from being pressed into matrix after acid rolls, cause leak
Plating or the generation of other surfaces quality.
Why reduction ratio is limited 45~75%, and its reason is by cold rolling, the deformation energy storage increase of steel plate, crystal grain quilt
Flatten, crushing, the ferrite of elongation is interlaced with pearlite, is advantageous to the recrystallization softening and austenite of ferrite crystal grain
Formed, but cold rolling reduction ratio is too big, resistance of deformation increase, adds the load of milling train, wastes the energy；
Why cold rolling exported into the surface reflectivity control of steel plate≤60%, be to show surface of steel plate because reflectivity is low
The residual iron level of Residual oil is relatively low, is advantageous to follow-up zinc-plated cleaning and finally improves coating surface quality；
Why annealing temperature is controlled at 770~810 DEG C, its reason is to control the volume of ferrite and austenite
Fraction, and then martensite and ferritic ratio are controlled, and the mechanical property of finished product is finally controlled, temperature is too low, and carbide does not have
Be completely dissolved, temperature it is too high, austenite volume fraction can accordingly increase, and both of which can cause the quenching degree of austenite to reduce,
So as to reduce the volume fraction of martensite in finished product, ultimately result in finished product low cross-intensity or yield strength is higher.
Why dew point in annealing furnace is controlled below -40 DEG C, oxygen content≤3ppm, its reason is to ensure steel plate table
Face fully reduces and improves the wellability of steel plate；
Why aluminium content in zinc liquid is controlled in 0.18~0.23%, Fe%≤0.009%, its reason is suppressed in zinc liquid
Push up the formation of bottom ash, so as to reduce the generation of surface cadmia and roll marks defect, while can ensure the aluminium in zinc liquid and base steel it
Between form fine and close continuous inhibition layer, so as to improve the adhesive force of coating.
Why by finishing elongation control 0.7~1.1%, main function is adjustment finished product plate shape, roughness and bent
Take intensity.
Compared with prior art, product material object mechanical property is reaching the present invention：260~320MPa of yield strength, tension
470~510MPa of intensity, elongation percentage 28 ~ 33%, n values 0.17 ~ 0.19, and product platability is good, coating surface uniform color is intact
Fall into, inhibition layer is continuously fine and close, and Zinc attachability reaches ball and rushes 1 grade of level, and zinc layers and base steel bend test are qualified, high in meeting
Level car is to high strength structure part and the surface quality requirements of outer covering piece.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of Galvanized Dual Phase Steel of the present invention；
Fig. 2 is Galvanized Dual Phase Steel inhibition layer shape appearance figure of the present invention.
Embodiment
The present invention is described in detail below：
Table 1 is the component comparative example of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters comparative example of various embodiments of the present invention and comparative example；
Table 3 is the performance text list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention produce according to following steps：
1）By set composition after smelting, refining and be casting continuously to form strand, strand is heated, heating and temperature control exists
1190~1250℃；
2）Finish rolling is carried out, controls its finishing temperature at 890~920 DEG C；
3）Batched：Oiler temperature control is at 580~620 DEG C；
4）Cold rolling is carried out after pickling：Pickling temperature is controlled at 70~90 DEG C, and the acid number in sour pond is not less than 40g/l；Control
Cold rolling total reduction is 45~75%；And control surface of steel plate reflectivity≤60%；
5）Carry out galvanizing：In the case where ensuring to enter annealing furnace front spring clean surface, annealed, control annealing temperature exists
770~810 DEG C, dew point control is below -40 DEG C in annealing furnace, oxygen content≤3ppm；Zinc liquid temperature is controlled 455~465
DEG C, aluminium content control is in 0.18~0.23%, Fe%≤0.009% in zinc liquid；
6）Carry out finishing：Finishing elongation control is 0.7~1.1%.
Explanation：Value in table 1 below and table 2 is not corresponding relation
The chemical composition comparative example of the various embodiments of the present invention of table 1 and comparative example（wt%）
The main technologic parameters list of the various embodiments of the present invention of table 2 and comparative example
The performance test results list of the various embodiments of the present invention of table 3 and comparative example
From table 3 it can be seen that 450MPa levels Galvanized Dual Phase Steel of the present invention is attached in mechanical property, coating surface quality and zinc layers
To put forth effort excellent, comparative example 1 is because silicone content is higher, although mechanical property is close with embodiment, coating surface quality and attachment
Power is not as good as embodiment；Although the composition of comparative example 2 is close with embodiment, because surface of steel plate reflectivity is too high, zinc liquid aluminium content
Relatively low and finishing elongation percentage is too high, causes the rise of finished product yield strength, elongation percentage n values to reduce, while surface quality and coating are attached
Put forth effort also not as good as embodiment.
Embodiment shows that 450MPa levels Galvanized Dual Phase Steel product material object mechanical property of the present invention reaches：Yield strength 265~
315MPa, 485~510MPa of tensile strength, elongation percentage 29 ~ 32%, n values 0.175 ~ 0.190；Product surface quality reaches：Coating
Surface color is uniform, and surface zero defect reaches C levels level, and inhibition layer is continuously fine and close, and Zinc attachability reaches ball and rushes 1 grade of level,
Zinc layers bend test is qualified, and intermediate car can be met to high strength structure part and the surface quality requirements of outer covering piece.With vapour
The light-weighted development of car, the steel have good market prospects.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.
Claims (1)
1. a kind of 450MPa levels car Galvanized Dual Phase Steel, its component and weight percent content are：C：0.04~0.09%,
Si：≤ 0.01%, Mn：1.0~2.0%, P：≤ 0.015%, S：≤ 0.010%, Als：0.01~0.08%, Mo 0.01 ~
0.30% or Cr：0.02 ~ 0.15%, Nb：0.001 ~ 0.02%, N：≤ 0.005%, remaining is iron and other inevitable impurity；
Mo and the compound additions of Cr, wherein Cr addition substitute 0.1%Mo meters according to 0.2 ~ 0.3%Cr, and control Cr+Mo≤1.0%；
Metallographic structure is：Ferrite and martensite；
Production method：
1）By set composition after smelting, refining and be casting continuously to form strand, strand is heated, heating and temperature control is 1190
~1250℃；
2）Finish rolling is carried out, controls its finishing temperature at 890~920 DEG C；
3）Batched：Oiler temperature control is at 580~620 DEG C；
4）Cold rolling is carried out after pickling：Pickling temperature is controlled at 70~90 DEG C, and the acid number in sour pond is not less than 40g/l；Control cold rolling
Total reduction is 45~75%；And control surface of steel plate reflectivity≤60%；
5）Carry out galvanizing：In the case where ensuring to enter annealing furnace front spring clean surface, annealed, control annealing temperature is 770
~810 DEG C, dew point control is below -40 DEG C in annealing furnace, oxygen content≤3ppm；Zinc liquid temperature control is at 455~465 DEG C, zinc
Aluminium content control is in 0.18~0.23%, Fe%≤0.009% in liquid；
6）Carry out finishing：Finishing elongation control is 0.7~1.1%.
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| CN107267727A (en) * | 2017-06-06 | 2017-10-20 | 武汉钢铁有限公司 | The manufacture method of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase sheet steels |
| CN107267726A (en) * | 2017-06-06 | 2017-10-20 | 武汉钢铁有限公司 | The manufacture method of 450MPa grades of cold-rolled biphase steels of tensile strength |
| KR102031454B1 (en) * | 2017-12-24 | 2019-10-11 | 주식회사 포스코 | Galvinized steel sheet having excellent adhesion at low temperature and excellent workability and method for manufacturing the same |
| CN109868416A (en) * | 2019-03-29 | 2019-06-11 | 本钢板材股份有限公司 | A kind of production technology of low cost hot dip galvanized dual phase steel DP590 |
| CN110527923B (en) * | 2019-06-03 | 2021-10-26 | 武汉钢铁有限公司 | High-yield-ratio structural steel for 600 MPa-grade automobile body and production method thereof |
| CN111826508B (en) * | 2020-07-24 | 2022-04-26 | 邯郸市纳百川钢材加工有限公司 | Manufacturing process of 450 MPa-level light steel heat-based high-strength galvanized plate |
| CN113215512A (en) * | 2021-03-08 | 2021-08-06 | 常熟科弘材料科技有限公司 | High-efficiency corrosion-resistant aluminum-zinc-plated steel plate and preparation method thereof |
| CN114438417B (en) * | 2022-02-09 | 2023-02-28 | 马鞍山钢铁股份有限公司 | Pure zinc coated steel plate with good zinc powder removal resistance and surface quality and production method and application thereof |
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| CN101942603A (en) * | 2010-09-28 | 2011-01-12 | 北京科技大学 | 600 MPa-grade ultra-low-silicon cold-rolled hot-galvanized dual-phase steel and preparation process thereof |
| CN102162073A (en) * | 2011-03-16 | 2011-08-24 | 北京科技大学 | Preparation method of low-carbon low-silicon cold-rolled hot-galvanized dual-phase steel for extra-deep drawing |
| CN105112778B (en) * | 2015-08-31 | 2017-03-08 | 武汉钢铁(集团)公司 | A kind of 460MPa level automotive frame coated steel and its ultrafast cold production method |
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