CN105441805B - A kind of 800MPa grades of car Galvanized Dual Phase Steel and production method - Google Patents
A kind of 800MPa grades of car Galvanized Dual Phase Steel and production method Download PDFInfo
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- CN105441805B CN105441805B CN201510968633.6A CN201510968633A CN105441805B CN 105441805 B CN105441805 B CN 105441805B CN 201510968633 A CN201510968633 A CN 201510968633A CN 105441805 B CN105441805 B CN 105441805B
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- 229910000885 Dual-phase steel Inorganic materials 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 30
- 239000011701 zinc Substances 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 238000005097 cold rolling Methods 0.000 claims abstract description 19
- 238000005554 pickling Methods 0.000 claims abstract description 14
- 238000005246 galvanizing Methods 0.000 claims abstract description 11
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 28
- 238000000137 annealing Methods 0.000 claims description 24
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 17
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 239000004411 aluminium Substances 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 229910000734 martensite Inorganic materials 0.000 claims description 11
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- 229910000859 α-Fe Inorganic materials 0.000 claims description 10
- 238000002310 reflectometry Methods 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000004615 ingredient Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- 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 10
- 238000000034 method Methods 0.000 description 9
- 239000010955 niobium Substances 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 7
- 238000007792 addition Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000005275 alloying Methods 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
- 239000000203 mixture Substances 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
- 229910018657 Mn—Al Inorganic materials 0.000 description 1
- 229910018643 Mn—Si Inorganic materials 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
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 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
- 150000001875 compounds Chemical class 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
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold 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
- 230000002401 inhibitory effect Effects 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
- DTSBBUTWIOVIBV-UHFFFAOYSA-N molybdenum niobium Chemical compound [Nb].[Mo] DTSBBUTWIOVIBV-UHFFFAOYSA-N 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000002245 particle Substances 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
- 238000001556 precipitation Methods 0.000 description 1
- 230000002829 reductive effect Effects 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
-
- 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
- C21D8/0236—Cold rolling
-
- 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
- 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
- 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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Coating With Molten Metal (AREA)
Abstract
A kind of 800MPa grades of car Galvanized Dual Phase Steel, component and wt% are：C：0.06~0.10%, Si：≤ 0.01%, Mn：1.5~2.5%, P：≤ 0.015%, S：≤ 0.010%, Als：0.01~0.08%, Mo 0.01 ~ 0.30% or Cr 0.02 ~ 0.9%, Nb：0.001 ~ 0.03%, N：≤ 0.005%；Production stage：Through smelt, refine and continuous casting after to heating strand；Finish rolling；It batches；Cold rolling after pickling；Galvanizing；Finishing.Product mechanical property of the present invention reaches：480~550MPa of yield strength, 815~865MPa of tensile strength, elongation percentage 14.5 ~ 19%, n values 0.11 ~ 0.13；Product platability is good, coating surface uniform color zero defect, and 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, can meet surface quality requirements of the intermediate car to high strength structure part and outer covering piece.
Description
Technical field
The present invention relates to a kind of automobile galvanized steel and methods, specifically belong to a kind of zinc-plated two-phase of 800MPa grades of 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 is with high intensity, low yield strength ratio and good formability
More favored by auto industry circle, application percentage is being continuously improved 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 under 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 strictly reasons such as control, plating leakage, exceeded, the zinc layers bending dezincification of surface defect etc.
Problem occurs often.
Through retrieval, 201110071272.7,201410535894.4,201410644803.0 and of Chinese Patent Application No.
201410644628.5 document individually discloses " 800MPa grades of cold-rolled biphase steels and its manufacturing method ", " 800MPa grades of cold rollings
It is dual phase steel and its production method ", " a kind of system cold-rolled dual phase steel of the high silicomanganese molybdenum niobium of high strength low-carbon and production method " and " a kind of high
The system cold-rolled dual phase steel of the low sial of carbon and production method in intensity ", passes through addition on the basis of C-Mn-Si or C-Mn-Al
The alloying elements such as Cr, Mo, Nb have produced 800MPa grades of cold-rolled biphase steels, since Si, Al element can be in tables in annealing process
Face is enriched with, thus is not suitable for producing the Galvanized Dual Phase Steel of great surface quality.
Invention content
The present invention is in view of the deficienciess of the prior art, provide a kind of yield strength in 480~550MPa, tensile strength exists
815~865MPa, elongation percentage 14.5 ~ 19%, n values be 0.11 ~ 0.13, platability is good, coating surface uniform color zero defect and
The excellent car Galvanized Dual Phase Steel of Zinc attachability and production method.
Realize the measure of above-mentioned purpose：
A kind of 800MPa grades of car Galvanized Dual Phase Steel, component and weight percent content are：C：0.06~0.10%,
Si：≤ 0.01%, Mn：1.5~2.5%, P：≤ 0.015%, S：≤ 0.010%, Als：0.01~0.08%, Mo 0.01 ~
0.30% or Cr 0.02 ~ 0.9%, Nb：0.001 ~ 0.03%, N：≤ 0.005%, remaining is iron and other inevitable impurity；Gold
Phase constitution is：Ferrite and martensite.
It is：Mo and the compound additions of Cr, the wherein addition of Cr 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 800MPa grades of car Galvanized Dual Phase Steel, step：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set ingredient, heating temperature 1230 ~
1290℃；
2）Finish rolling is carried out, controls its finishing temperature at 870~910 DEG C；
3）It is batched：Oiler temperature control is at 580~620 DEG C；
4）Cold rolling is carried out after pickling：At 70~90 DEG C, the acid value in sour pond is not less than 40g/l for pickling temperature control；Control
Cold rolling total reduction is 45~75%；And control surface of steel plate reflectivity≤60%；
5）Carry out galvanizing：It in the case where ensuring to enter annealing furnace front spring clean surface, anneals, control annealing temperature exists
790~850 DEG C, dew point is controlled at -40 DEG C hereinafter, oxygen content≤3ppm in annealing furnace；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 0.5~0.9%.
The effect of each element in the present invention
C：Carbon in dual phase steel significantly affects all phase transition process, and control no longer based on solution strengthening
Final microstructure and mechanical property, to ensure the shape in the larger ferrite precipitation area advantageous to finished product mechanical property and martensitic phase
Looks and hardness, carbon content cannot be excessively high；Meanwhile carbon content has galvanizing significant impact 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 as to which zinc coat adhesiveness be made to degenerate and easily make
There is list edge defect into zinc surface；In addition 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
Point intensity be also complete automobile collision safety important indicator, in this respect the considerations of, 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 0.06~0.10%.
Si：For hot dip galvanized dual phase steel, Si elements easily form SiO in annealing in belt steel surface enrichment oxidation2
Oxidation film it is difficult to by hydrogen reducing, so as to reduce zinc-plated wellability, causes plating leakage, pin hole, Zinc attachability the coating such as not to conform to
Defect, while Si elements also have the spot welding characteristics of galvanized sheet harmful effect, therefore in order to reduce silicon to greatest extent to surface
The influence of quality, the present invention 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 improves the quenching degree of steel, promotes to form martensite in rapid cooling cooling procedure, and plays solution strengthening and refinement iron element
The effect of body crystal grain, but Mn can be aoxidized and be deposited 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 1.5 ~ 2.5%.
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, the fatigue behaviour of steel can be reduced by being formed simultaneously field trash, therefore the present invention 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, since the aluminium of addition volume easily forms aluminium 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 significantly moves to right, and strong inhibition pearlite and bainite transformation are conducive 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
Part Mo is replaced, in general 0.1%Mo can be substituted with 0.2 ~ 0.3%Cr；In addition, the generation due to 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 must satisfy 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, to determine to provide convenience in Unhydrated cement final rolling temperature.Nb also promotees while fining ferrite grains
Into martensitic phase refinement and be uniformly distributed, greatly improve the performance uniformity of steel, but the Nb of excessive addition can lead to iron
The carbonitride of Nb is precipitated in ferritic, significantly improves the yield strength of finished product, to it is stamping unfavorable and increase it is unnecessary into
This, therefore the present invention claims control the content of Nb in the range of 0.001 ~ 0.03%.
N：The fewer N the better in steel, therefore requires N≤0.005%
In the technique of the present invention,
Why slab heating temperature is controlled at 1230 ~ 1290 DEG C, the reason is that can ensure 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 870~910 DEG C, the reason is that finishing temperature is less than 870 DEG C hereinafter, hot rolling temperature
Degree, which slightly fluctuates, to be possible to enter two-phase section rolling, easily generates mixed grain structure, and this non-uniform brilliant tissue has heredity
Property, even if by being not easy to eliminate cold rolling and annealing, the inhomogeneities of tissue is in addition to can generate the uniformity of mechanical property
Outside influencing, the uniformity of galvanizing surface can also be had an impact；
Why by oiler temperature control at 580~620 DEG C, the reason is that hot rolling coiling temperature is excessively high, be easy to cause heat
It rolls substrate coarse grains and banded structure occurs, the uniformity of hot-rolled substrate tissue can be effectively improved by reducing coiling temperature,
The crystal grain for making hot-rolled substrate is fine and smooth uniformly, so as to improve hot rolling banded structure, and then reduces cold rolling recrystallization crystal particle dimension so that
Cold rolled annealed tissue is more uniform.
Why pickling temperature is controlled at 70~90 DEG C, the acid value requirement in sour pond is not less than 40g/l, the reason is that effectively
Ensure that the iron scale of hot rolling plate surface thoroughly cleans up, residual oxidization iron sheet is avoided to be pressed into matrix after acid rolls, causes to leak
Plating or the generation of other surfaces quality.
Why reduction ratio is limited 45~75%, the reason is that by cold rolling, the deformation energy storage of steel plate increases, crystal grain quilt
It flattens, crushing, the ferrite of elongation is interlaced with pearlite, is conducive to the recrystallization softening and austenite of ferrite crystal grain
It is formed, but cold rolling reduction ratio is too big, resistance of deformation increase, increases the load of milling train, waste of energy；
Why by the surface reflectivity control of cold rolling outlet 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 conducive to follow-up zinc-plated cleaning and finally improves coating surface quality；
Why annealing temperature is controlled at 780~850 DEG C, the reason is that in order to control the volume of ferrite and austenite
Score, and then martensite and ferritic ratio are controlled, and finally control the mechanical property of finished product, temperature is too low, and carbide does not have
Be completely dissolved, temperature it is excessively high, austenite volume fraction can accordingly increase, and can both lead to the quenching degree of austenite to reduce,
So as to reduce the volume fraction of martensite in finished product, eventually lead to finished product low cross-intensity or yield strength is higher.
Why by dew point control in annealing furnace at -40 DEG C hereinafter, oxygen content≤3ppm, the reason is that ensureing steel plate table
Face fully restores and improves the wellability of steel plate；
Why aluminium content in zinc liquid is controlled in 0.18~0.23%, Fe%≤0.009%, the reason is that inhibiting 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 0.5~0.9%, main function is adjustment production board shape, roughness and bends
Take intensity.
Compared with prior art, the present invention product material object mechanical property reaches：480~550MPa of yield strength, tension are strong
Spend 815~865MPa, elongation percentage 14.5 ~ 19%, n values 0.11 ~ 0.13；Product platability is good, coating surface uniform color is intact
It falls 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
Grade car is to the surface quality requirements of high strength structure part and outer covering piece.
Description of the drawings
Fig. 1 is the micro-organization chart of Galvanized Dual Phase Steel of the present invention；
Fig. 2 presses down stress-strain diagram for Galvanized Dual Phase Steel of the present invention；
Fig. 3 is Galvanized Dual Phase Steel inhibition layer shape appearance figure of the present invention；
Fig. 4 rushes rear surface pattern for 800MPa grades of Galvanized Dual Phase Steel ball of the present invention.
Specific embodiment
The present invention is described in detail below：
Table 1 is various embodiments of the present invention and the component comparative example of comparative example；
Table 2 is various embodiments of the present invention and the main technologic parameters comparative example of comparative example；
Table 3 is various embodiments of the present invention and the performance text list of comparative example.
Various embodiments of the present invention are produced according to following steps：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set ingredient, heating temperature 1230 ~
1290℃；
2）Finish rolling is carried out, controls its finishing temperature at 870~910 DEG C；
3）It is batched：Oiler temperature control is at 580~620 DEG C；
4）Cold rolling is carried out after pickling：At 70~90 DEG C, the acid value in sour pond is not less than 40g/l for pickling temperature control；Control
Cold rolling total reduction is 45~75%；And control surface of steel plate reflectivity≤60%；
5）Carry out galvanizing：It in the case where ensuring to enter annealing furnace front spring clean surface, anneals, control annealing temperature exists
790~850 DEG C, dew point is controlled at -40 DEG C hereinafter, oxygen content≤3ppm in annealing furnace；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 0.5~0.9%.
Explanation：Value in one the following table 1 and table 2 is not correspondence
The chemical composition comparative example of 1 various embodiments of the present invention of table and comparative example（wt%）
The main technologic parameters list of 2 various embodiments of the present invention of table and comparative example
The performance test results list of 3 various embodiments of the present invention of table and comparative example
From table 3 it can be seen that 800MPa grades of 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 since silicone content is higher, although mechanical property is close with embodiment, coating surface quality and attachment
Power is not as good as embodiment；Although 2 ingredient of embodiment is close with embodiment, since surface of steel plate reflectivity is excessively high, zinc liquid aluminium content
Relatively low and finishing elongation percentage is excessively high, and the raising of finished product yield strength, elongation percentage n values is caused to reduce, while surface quality and coating are attached
Put forth effort also not as good as embodiment.
Embodiment shows that 800MPa grades of Galvanized Dual Phase Steel product material object mechanical property of the present invention reaches：Yield strength 480~
550MPa, 815~865MPa of tensile strength, elongation percentage 14.5 ~ 19%, n values 0.11 ~ 0.13；Product surface quality reaches：Coating
Surface color is uniform, and surface zero defect reaches C grades of levels, 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, can meet surface quality requirements of the intermediate car to high strength structure part and outer covering piece.With vapour
The light-weighted development of vehicle, 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 (4)
1. a kind of 800MPa grades of car Galvanized Dual Phase Steel, component and weight percent content are：C：0.061%, Si：
0.008%, Mn：2.4%, P：0.013%, S：0.005%, Als：0.04%, Mo：0.30%, Cr：0.5%, Nb：0.028%,
N：0.0041%, remaining is iron and other inevitable impurity；Metallographic structure is：Ferrite and martensite；
Production stage：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set ingredient, heating temperature is at 1240 DEG C；
2）Finish rolling is carried out, controls its finishing temperature at 890 DEG C；
3）It is batched：Oiler temperature control is at 590 DEG C；
4）Cold rolling is carried out after pickling：At 70 DEG C, the acid value in sour pond is not less than 40g/l for pickling temperature control；Control cold rolling stagnation pressure
Lower rate is 68%；And control surface of steel plate reflectivity 59%；
5）Carry out galvanizing：It in the case where ensuring to enter annealing furnace front spring clean surface, anneals, control annealing temperature is 840
DEG C, dew point is controlled at -40 DEG C hereinafter, oxygen content≤3ppm in annealing furnace；Zinc liquid temperature is controlled in 455~465 DEG C, zinc liquid
Aluminium content is controlled in 0.18%, Fe%≤0.009%；
6）Carry out finishing：Finishing elongation control is 0.8%.
2. a kind of 800MPa grades of car Galvanized Dual Phase Steel, component and weight percent content are：C：0.073%, Si：
0.007%, Mn：2.2%, P：0.012%, S：0.007%, Als：0.05%, Mo：0.19%, Cr：0.45%, Nb：0.025%,
N：0.0043%, remaining is iron and other inevitable impurity；Metallographic structure is：Ferrite and martensite；
Production stage：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set ingredient, heating temperature is at 1280 DEG C；
2）Finish rolling is carried out, controls its finishing temperature at 900 DEG C；
3）It is batched：Oiler temperature control is at 600 DEG C；
4）Cold rolling is carried out after pickling：At 85 DEG C, the acid value in sour pond is not less than 40g/l for pickling temperature control；Control cold rolling stagnation pressure
Lower rate is 63.5%；And control surface of steel plate reflectivity 58%；
5）Carry out galvanizing：It in the case where ensuring to enter annealing furnace front spring clean surface, anneals, control annealing temperature is 830
DEG C, dew point is controlled at -40 DEG C hereinafter, oxygen content≤3ppm in annealing furnace；Zinc liquid temperature is controlled in 455~465 DEG C, zinc liquid
Aluminium content is controlled in 0.192%, Fe%≤0.009%；
6）Carry out finishing：Finishing elongation control is 0.75%.
3. a kind of 800MPa grades of car Galvanized Dual Phase Steel, component and weight percent content are：C：0.082%, Si：
0.009%, Mn：1.9%, P：0.011%, S：0.006%, Als：0.07%, Mo：0.18%, Cr：0.35%, Nb：0.022%,
N：0.0045%, remaining is iron and other inevitable impurity；Metallographic structure is：Ferrite and martensite；
Production stage：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set ingredient, heating temperature is at 1250 DEG C；
2）Finish rolling is carried out, controls its finishing temperature at 910 DEG C；
3）It is batched：Oiler temperature control is at 605 DEG C；
4）Cold rolling is carried out after pickling：At 80 DEG C, the acid value in sour pond is not less than 40g/l for pickling temperature control；Control cold rolling stagnation pressure
Lower rate is 62%；And control surface of steel plate reflectivity 55%；
5）Carry out galvanizing：It in the case where ensuring to enter annealing furnace front spring clean surface, anneals, control annealing temperature is 820
DEG C, dew point is controlled at -40 DEG C hereinafter, oxygen content≤3ppm in annealing furnace；Zinc liquid temperature is controlled in 455~465 DEG C, zinc liquid
Aluminium content is controlled in 0.205%, Fe%≤0.009%；
6）Carry out finishing：Finishing elongation control is 0.65%.
4. a kind of 800MPa grades of car Galvanized Dual Phase Steel, component and weight percent content are：C：0.098%, Si：
0.008%, Mn：1.6%, P：0.01%, S：0.004%, Als：0.06%, Mo：0.10%, Cr：0.65%, Nb：0.012%,
N：0.0039%, remaining is iron and other inevitable impurity；Metallographic structure is：Ferrite and martensite；
Production stage：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set ingredient, heating temperature is at 1260 DEG C；
2）Finish rolling is carried out, controls its finishing temperature at 895 DEG C；
3）It is batched：Oiler temperature control is at 595 DEG C；
4）Cold rolling is carried out after pickling：At 90 DEG C, the acid value in sour pond is not less than 40g/l for pickling temperature control；Control cold rolling stagnation pressure
Lower rate is 67%；And control surface of steel plate reflectivity 52%；
5）Carry out galvanizing：It in the case where ensuring to enter annealing furnace front spring clean surface, anneals, control annealing temperature is 795
DEG C, dew point is controlled at -40 DEG C hereinafter, oxygen content≤3ppm in annealing furnace；Zinc liquid temperature is controlled in 455~465 DEG C, zinc liquid
Aluminium content is controlled in 0.218%, Fe%≤0.009%；
6）Carry out finishing：Finishing elongation control is 0.55%.
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| CN108396253A (en) * | 2018-01-10 | 2018-08-14 | 唐山钢铁集团有限责任公司 | A kind of zinc-plated diphasic strip steel of the high intensity that buckling performance is excellent and its production method |
| CN108823507B (en) * | 2018-06-28 | 2020-12-11 | 武汉钢铁有限公司 | Tensile strength 800 MPa-grade hot-galvanized high-strength steel and reduction production method thereof |
| CN109097705B (en) * | 2018-09-26 | 2020-05-26 | 武汉钢铁有限公司 | 800 MPa-grade cold-rolled hot-galvanized dual-phase steel and production method thereof |
| CN109402525B (en) * | 2018-11-28 | 2020-09-04 | 北京首钢冷轧薄板有限公司 | Processing method of 780 MPa-grade yield strength 1000 MPa-grade tensile strength dual-phase steel |
| 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 |
| CN109881106B (en) * | 2019-04-01 | 2021-10-26 | 山东钢铁集团日照有限公司 | 780 MPa-grade hot-galvanized dual-phase steel with different yield strength grades and production method thereof |
| CN111850394A (en) * | 2020-06-30 | 2020-10-30 | 邯郸钢铁集团有限责任公司 | Tensile strength 830 MPa-grade hot-galvanized bundle strip steel and preparation method thereof |
| CN115369321A (en) * | 2022-08-16 | 2022-11-22 | 包头钢铁（集团）有限责任公司 | Economical high-strength hot-galvanized dual-phase steel and manufacturing method thereof |
| CN116240459A (en) * | 2023-02-14 | 2023-06-09 | 唐山钢铁集团有限责任公司 | Dual-phase steel and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN105088068A (en) * | 2015-08-31 | 2015-11-25 | 武汉钢铁(集团)公司 | Coated steel used for 500 MPa grade automobile girder and ultrafast-cooling production method of coated steel |
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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 |
| CN105088068A (en) * | 2015-08-31 | 2015-11-25 | 武汉钢铁(集团)公司 | Coated steel used for 500 MPa grade automobile girder and ultrafast-cooling production method of coated steel |
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