CN106834938A - The high-strength galvanized steel of 400MPa grade ultra-low-carbons and its production method - Google Patents
The high-strength galvanized steel of 400MPa grade ultra-low-carbons and its production method Download PDFInfo
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- CN106834938A CN106834938A CN201710031686.4A CN201710031686A CN106834938A CN 106834938 A CN106834938 A CN 106834938A CN 201710031686 A CN201710031686 A CN 201710031686A CN 106834938 A CN106834938 A CN 106834938A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 21
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 21
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011701 zinc Substances 0.000 claims abstract description 18
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000005097 cold rolling Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 17
- 239000010959 steel Substances 0.000 abstract description 17
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 239000011159 matrix material Substances 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 238000004080 punching Methods 0.000 abstract description 2
- 230000006641 stabilisation Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical group [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000794 TRIP steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000005413 snowmelt Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 208000016261 weight loss Diseases 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- 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
- C22C38/02—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
- C22C38/04—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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
-
- 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
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)
Abstract
The invention discloses a kind of high-strength galvanized steel of 400MPa grade ultra-low-carbons and its production method, the weight/mass percentage composition of its substrate composition is：C≤0.0050%, Si 0.05~0.10%, Mn 0.50~0.95%, P 0.055~0.085%, S≤0.012%, Als 0.025~0.055%, Nb 0.015~0.030%, Ti 0.020~0.030%, B 0.0005~0.0015%, N≤0.0050%, remaining is Fe and not purgeable impurity.Interstitial atom C and N that the present invention is fixed in steel using Ti, and plate last layer pure zinc layer in belt steel surface, the effective corrosion for hindering matrix, its finished product has good processability, mechanical performance and corrosion resistance, tensile strength is in more than 400MPa, and production is simple, cost is relatively low, with good application prospect.This method uses new composition design, by controlling each technological parameter come the method for producing punching press high-strength steel, greatly reduces production cost, improves qualification rate；Simple with production, enforcement difficulty is small, low cost, production stabilization, the characteristics of processability is excellent.
Description
Technical field
The present invention relates to a kind of galvanized steel, especially a kind of high-strength galvanized steel of 400MPa grade ultra-low-carbons and its producer
Method.
Background technology
With the tremendous development of Global Auto industry, energy-saving and environmental protection have turned into the main trend of its Future Development with safety.
The energy consumption of automobile and its deadweight are linear, such as weight reduction 10%, then oil consumption can reduce by 8%, and discharge reduces by 4%, it is clear that light weight
Change significant to the energy-conservation of automobile and reduction discharge.At present, car body factory is extensive using high in order to reduce vehicle body deadweight
Strong steel replaces common steel plate.Such as dual phase steel and transformation induced plasticity steel in advanced high-strength steel, advanced super-high strength steel
(AHSS) it is that part thickness can be with thinning, so that automobile after the strength of materials is improved to be applied to the advantage of auto parts and components manufacture
Overall material is reduced, and quality mitigates, and automobile fuel consumption and discharge capacity also reduce therewith.While car mass is mitigated, automobile is touched
Security performance is hit to be guaranteed because its material is high-strength.Therefore no matter from advanced superelevation in terms of energy-saving or security performance angle
The strong steel capital is the optimal material of automobile steel.
It is well known that in solution strengthening element, mainly there is phosphorus, manganese and silicon etc., wherein the reinforcing most pronounced effects of phosphorus, should
With most wide, it is considered that the intensity of ferrite matrix can be improved about 700MPa by the solid solution phosphorus of 1% mass fraction, therefore, Ultra-low carbon
Phosphorous high-strength steel be widely used, but phosphorus is too high to bring a counter productive, be exactly no matter to be fixed using Ti or Nb
Interstitial atom, can all weaken the performance of steel grade, to the mechanical performance and processability of material because of precipitation FeTiP with FeNbP phases
It is unfavorable, simultaneously because the precipitation of phosphorous phase can weaken its solid solution strengthening effect.While loss of weight, to the corrosion resistance of high-strength steel
Propose requirement higher.
At present, worldwide the outside plate of passenger car mainly uses hot-dip galvanizing sheet steel.Generally, bodywork surface
Multiple coating can provide effective protection for galvanized steel plain sheet, but guarantor will be lost to galvanized steel plain sheet after coating is because of external force breakage
Shield is acted on, if zinc coat is also destroyed simultaneously, vehicle body will locally expose what is be made up of zinc coat and steel substrate
Accelerate the failure in the presence of complex phase metal Coupling electrode, air, rainwater in environment and the mud of salt containing snow melt, cause vehicle body
Perforation.There is difficulty greatly in the current production on high-strength galvanized steel, production cost is high, the low weak point of qualification rate.
The content of the invention
The technical problem to be solved in the present invention is to provide the high-strength plating of 400MPa grade ultra-low-carbons of a kind of process is simple, low cost
Zinc strip；Present invention also offers a kind of production method of the high-strength galvanized steel of 400MPa grade ultra-low-carbons.
In order to solve the above technical problems, the weight/mass percentage composition of substrate composition of the present invention is：C≤0.0050%, Si 0.05
~0.10%, Mn 0.50~0.95%, P 0.055~0.085%, S≤0.012%, Als 0.025~0.055%, Nb 0.015~
0.030%, Ti 0.020~0.030%, B 0.0005~0.0015%, N≤0.0050%, remaining is Fe and not purgeable miscellaneous
Matter.
The inventive method includes heating, hot rolling, cold rolling, continuous zinc coating and finishing operation, the substrate of the galvanized steel into
Divide weight/mass percentage composition as described above.
Hot-rolled process described in the inventive method：Finish rolling finishing temperature is 900~950 DEG C, and coiling temperature is 680~720 DEG C.
Cold rolling process described in the inventive method：Cold rolling reduction ratio >=75%.
Continuous zinc coating operation described in the inventive method：Soaking temperature is 800~830 DEG C；Slow cooling terminates 670~730 DEG C, soon
440~490 DEG C of cold junction beam；458~462 DEG C of zinc-plated temperature.In the continuous zinc coating operation, annealing process soaking time 100~
200s, 5~10 DEG C/s of slow cooling cooldown rate, rapid cooling cooldown rate 20~60 DEG C/s, zinc-plated 5~15s of time.
Finishing operation described in the inventive method：Finishing elongation percentage is 0.5%~2.0%.
Heating process described in the inventive method：Heating-up temperature is 1150~1250 DEG C, and total heat time is 90~180min.
It is using the beneficial effect produced by above-mentioned technical proposal：The interstitial atom that the present invention is fixed in steel using Ti
C and N, and last layer pure zinc layer is plated in belt steel surface, the corrosion of matrix is effectively hindered, its finished product has good mouldability
Energy, mechanical performance and corrosion resistance, tensile strength is in more than 400MPa, and production is simple, and cost is relatively low, is answered with good
Use prospect.
The inventive method uses new composition design, by controlling steel-making, continuous casting, hot rolling, cold rolling, continuous zinc coating and finishing
The method that punching press high-strength steel is produced Deng technological parameter, greatly reduces production cost, improves qualification rate；With production letter
Single, enforcement difficulty is small, low cost, production stabilization, the characteristics of processability is excellent.
Specific embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1~12：The high-strength galvanized steel of this 400MPa grade ultra-low-carbons is produced using following methods.
Using the continuous casting billet of chemical analysis described in table 1, the preparation of heated, hot rolling, cold rolling, continuous zinc coating and finishing operation
Into；Heating process uses stepped heating stove heat, and the heating-up temperature of continuous casting billet is 1150~1250 DEG C, and total heat time is 90
~180min；It is 900~950 DEG C that hot-rolled process uses finish rolling finishing temperature, and coiling temperature is 680~720 DEG C；Cold rolling process
Cold rolling reduction ratio be 75% and more than；It is 800~830 DEG C that continuous zinc coating operation uses heating-up temperature, and soaking temperature is 800~830
DEG C, 670~730 DEG C of slow cooling end temp, 440~490 DEG C of rapid cooling end temp, zinc-plated temperature（Zinc liquid temperature）458~462
DEG C, annealing process 100~200s of soaking time, 5~10 DEG C/s of slow cooling cooldown rate, 20~60 DEG C/s of rapid cooling cooldown rate, plating
5~15s of zinc time；The finishing elongation percentage that finishing operation is used is 0.5~2.0%；Heating, hot rolling, cold rolling and finishing operation work
Skill parameter is shown in Table 2, and the technological parameter of continuous zinc coating is shown in Table 3.
Table 1：The chemical composition (wt.%) of embodiment 1-12 continuous casting billets
In table 1, balance of Fe and not purgeable impurity.
Table 2：Embodiment 1-12 heating, hot rolling, cold rolling and finishing operation technological parameter
Table 3：The technological parameter of embodiment 1-12 continuous zinc coatings
Each embodiment gained galvanized steel carries out performance detection, takes horizontal sample, and sample marking distance is 80mm, and the width of parallel-segment is
25mm, the mechanical property that detection is obtained is shown in Table 4.
Table 4：The mechanical property of embodiment 1-12 products obtained therefroms
| Embodiment | Tensile strength MPa | Yield strength MPa | Elongation % | N values | R values |
| 1 | 421 | 298 | 34 | 0.19 | 2 |
| 2 | 424 | 276 | 34.5 | 0.19 | 2.15 |
| 3 | 423 | 271 | 35 | 0.21 | 2.25 |
| 4 | 424 | 273 | 34.5 | 0.21 | 2.35 |
| 6 | 423 | 291 | 35.5 | 0.19 | 2.15 |
| 7 | 405 | 267 | 36 | 0.19 | 2.25 |
| 8 | 423 | 287 | 35.5 | 0.19 | 2.15 |
| 9 | 406 | 294 | 36.5 | 0.19 | 2.10 |
| 10 | 402 | 271 | 35 | 0.2 | 2.05 |
| 11 | 405 | 273 | 35 | 0.19 | 2.1 |
| 12 | 411 | 282 | 34 | 0.19 | 2.2 |
Claims (8)
1. a kind of high-strength galvanized steel of 400MPa grade ultra-low-carbons, it is characterised in that the weight/mass percentage composition of its substrate composition is：C
≤ 0.0050%, Si 0.05~0.10%, Mn 0.50~0.95%, P 0.055~0.085%, S≤0.012%, Als 0.025~
0.055%, Nb 0.015~0.030%, Ti 0.020~0.030%, B 0.0005~0.0015%, N≤0.0050%, remaining is
Fe and not purgeable impurity.
2. a kind of production method of the high-strength galvanized steel of 400MPa grade ultra-low-carbons, it is characterised in that：It includes heating, hot rolling, cold
Roll, continuous zinc coating and finishing operation, the substrate composition quality percentage composition of the galvanized steel is：C≤0.0050%, Si 0.05
~0.10%, Mn 0.50~0.95%, P 0.055~0.085%, S≤0.012%, Als 0.025~0.055%, Nb 0.015~
0.030%, Ti 0.020~0.030%, B 0.0005~0.0015%, N≤0.0050%, remaining is Fe and not purgeable miscellaneous
Matter.
3. the production method of the high-strength galvanized steel of 400MPa grade ultra-low-carbons according to claim 2, it is characterised in that described
Hot-rolled process：Finish rolling finishing temperature is 900~950 DEG C, and coiling temperature is 680~720 DEG C.
4. the production method of the high-strength galvanized steel of 400MPa grade ultra-low-carbons according to claim 2, it is characterised in that described
Cold rolling process：Cold rolling reduction ratio >=75%.
5. the production method of the high-strength galvanized steel of 400MPa grade ultra-low-carbons according to claim 2, it is characterised in that described
Continuous zinc coating operation：Soaking temperature is 800~830 DEG C；Slow cooling terminates 670~730 DEG C, and rapid cooling terminates 440~490 DEG C；It is zinc-plated
458~462 DEG C of temperature.
6. the production method of the high-strength galvanized steel of 400MPa grade ultra-low-carbons according to claim 5, it is characterised in that：It is described
In continuous zinc coating operation, annealing process 100~200s of soaking time, 5~10 DEG C/s of slow cooling cooldown rate, rapid cooling cooldown rate 20
~60 DEG C/s, zinc-plated 5~15s of time.
7. the production method of the high-strength galvanized steel of 400MPa grade ultra-low-carbons according to claim 2, it is characterised in that described
Finishing operation：Finishing elongation percentage is 0.5%~2.0%.
8. the production method of the high-strength galvanized steel of 400MPa grade ultra-low-carbons according to claim 2-7 any one, it is special
Levy and be, the heating process：Heating-up temperature is 1150~1250 DEG C, and total heat time is 90~180min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107513668A (en) * | 2017-07-20 | 2017-12-26 | 首钢集团有限公司 | A kind of heat zinc coating plate and its processing method |
| CN109604336A (en) * | 2018-10-24 | 2019-04-12 | 首钢京唐钢铁联合有限责任公司 | Method and device for preparing hot-dip galvanized sheet |
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| JPH0543982A (en) * | 1991-08-12 | 1993-02-23 | Sumitomo Metal Ind Ltd | Cold rolled steel sheet for deep drawing and its production |
| EP1111081A1 (en) * | 1999-12-22 | 2001-06-27 | Sidmar N.V. | An ultra-low carbon steel composition, the process of production of an ULC BH steel product and the product obtained |
| CN101684533A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | High-strength cold-rolled sheet with excellent formability and production method thereof |
| CN102719751A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | High-strength cold-rolled hot-galvanized dual-phase steel plate and manufacturing method thereof |
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| CN107513668A (en) * | 2017-07-20 | 2017-12-26 | 首钢集团有限公司 | A kind of heat zinc coating plate and its processing method |
| CN109604336A (en) * | 2018-10-24 | 2019-04-12 | 首钢京唐钢铁联合有限责任公司 | Method and device for preparing hot-dip galvanized sheet |
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