CN106929771B - The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate and preparation method - Google Patents
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate and preparation method Download PDFInfo
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- CN106929771B CN106929771B CN201710117509.8A CN201710117509A CN106929771B CN 106929771 B CN106929771 B CN 106929771B CN 201710117509 A CN201710117509 A CN 201710117509A CN 106929771 B CN106929771 B CN 106929771B
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 34
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 title abstract description 52
- 239000010959 steel Substances 0.000 title abstract description 52
- 238000010438 heat treatment Methods 0.000 claims abstract description 69
- 238000000034 method Methods 0.000 claims abstract description 55
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 47
- 239000011701 zinc Substances 0.000 claims abstract description 47
- 238000005097 cold rolling Methods 0.000 claims abstract description 42
- 238000002161 passivation Methods 0.000 claims abstract description 41
- 238000000576 coating method Methods 0.000 claims abstract description 32
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000005098 hot rolling Methods 0.000 claims abstract description 14
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 45
- 238000010583 slow cooling Methods 0.000 claims description 28
- 238000002791 soaking Methods 0.000 claims description 28
- 238000000137 annealing Methods 0.000 claims description 20
- 238000005246 galvanizing Methods 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 14
- 238000007730 finishing process Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 19
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 239000004615 ingredient Substances 0.000 abstract description 4
- 238000009749 continuous casting Methods 0.000 description 22
- 239000007788 liquid Substances 0.000 description 11
- 238000004321 preservation Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910000734 martensite Inorganic materials 0.000 description 8
- 239000000047 product Substances 0.000 description 6
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
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- 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)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses the high-strength galvanized steel of 1000MPa grades of two-phases and steel plates and preparation method thereof, the strip and substrate steel sheet ingredient and its mass content are as follows: C:0.06~0.15%, Mn:2.2~2.8%, Si:0.45~0.65%, Cr:0.40~0.60%, P≤0.012%, S≤0.002%, Als:0.020~0.070%, Ti:0.010~0.030%, Mo:0.15~0.30%, remaining is Fe and not purgeable impurity.Preparation method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure.The present invention is designed using new ingredient, by controlling the technological parameter of each process, is greatly reduced production difficulty, is improved product qualified rate.Finished product has the characteristics that good processability, mechanical performance and corrosion resistance, and tensile strength is in 1000MPa or more.
Description
Technical field
The invention belongs to iron and steel smelting technology fields, and in particular to the high-strength galvanized steel of 1000MPa grades of two-phases and steel plate and
Preparation method.
Background technique
In recent years, in order to meet the needs of the energy-saving and environmental protection of automobile loss of weight and safety, the advanced high-strength steel such as dual phase steel is got over
To get over the concern by scholars.Yield strength is low, tensile strength is high, yield tensile ratio is low, processing hardening is bright because having for dual phase steel
Aobvious, many advantages, such as elongation after fracture is high, easily stamping, good plasticity and toughness match, is increasingly becoming the weight of automobile manufacture
Want material.
The microscopic structure of the high-strength galvanizing steel Automobile Plate product of DP series is made of ferrite and martensite, martensitic structure with
Island Dispersed precipitate is on ferritic matrix.Ferrite is softer, and steel is made to have preferable formability；Martensite is harder, makes
Steel have higher intensity.With the raising of martensite proportion, its intensity is higher.Depending on the application, varying strength can be produced
The dual phase steel of rank and different yield tensile ratios (YS/TS).Dual phase steel is easily cut and formed, and can be welded with traditional welding method.It has
It is standby extend without surrender, without room-temperature aging, low yield strength ratio, high work hardening index and baking hardening value the characteristics of.
In the production process of high-strength galvanized steel and steel plate, since the additive amount of Mn and Si element is more, in annealing process
In, Mn and Si element generates oxide to surface enrichment, is enriched with, makes in strip and surface of steel plate in follow-up heat treatment process
It is reduced at the adhesiveness of strip and surface of steel plate and pure zinc, or even will cause the plating leakage of zinc layers.Therefore new ingredient design is studied,
By the process parameter control to each process, control especially to annealing process technological parameter can decide strip and steel
Template, surface quality and the mechanical property of plate.
Summary of the invention
The technical problem to be solved in the present invention is to provide the wide high-strength galvanized steels of 1000MPa grade two-phase of annealing temperature window
And steel plate；The present invention also provides the preparation methods of 1000MPa grades of two-phases high-strength galvanized steel and steel plate.The method of the present invention uses
Prepared by new ingredient design, the technological parameter by controlling each process, greatly reduce production difficulty, improves finished product conjunction
Lattice rate；The features such as simple with production, enforcement difficulty is small, production stabilization, baking hardening effect and low yield tensile ratio.
In order to solve the above technical problems, the present invention adopts the following technical scheme: 1000MPa grades of high-strength galvanized steels of two-phase and
Steel plate, the galvanized steel and substrate steel sheet chemical component and mass percentage are as follows: C:0.06~0.15%, Mn:2.2~
2.8%, Si:0.45~0.65%, Cr:0.40~0.60%, P≤0.012%, S≤0.002%, Als:0.020~0.070%, Ti:
0.010~0.030%, Mo:0.15~0.30%, remaining is Fe and not purgeable impurity.
The present invention also provides the preparation methods of 1000MPa grades of two-phases high-strength galvanized steel and steel plate comprising heating, heat
It rolls, cold rolling, continuous zinc coating, finishing and passivation procedure, the galvanized steel and substrate steel sheet chemical component and mass percentage
Are as follows: C:0.06~0.15%, Mn:2.2~2.8%, Si:0.45~0.65%, Cr:0.40~0.60%, P≤0.012%, S≤
0.002%, Als:0.020~0.070%, Ti:0.010~0.030%, Mo:0.15~0.30%, remaining is Fe and not purgeable
Impurity.The harden ability that steel is usually improved using addition Mn and Cr member, increases the generation ratio of martensite during rapid cooling；Addition
Mo element can slow down the precipitation of martensite panel-shaped base body grain boundary carbide, in phase transition process so as to improve microstructure and property.
Hot-rolled process of the present invention, heating temperature are 1200~1350 DEG C, and finish rolling finishing temperature is 875~905 DEG C, volume
Taking temperature is 620~750 DEG C.
Cold rolling process of the present invention, cold rolling reduction ratio >=50%.
Continuous zinc coating process of the present invention, soaking temperature are 760~840 DEG C；First slow cooling is to 680~740 DEG C, then rapid cooling
To 420~450 DEG C；458~462 DEG C of zinc-plated temperature；Annealing soaking time be 100~200s, 10~20 DEG C of slow cooling cooling rate/
S, rapid cooling cooling rate 35~65 DEG C/s, 5~15s of galvanizing time；- 10 DEG C~+20 DEG C of preheating section dew point (+8 DEG C of target), heating
- 20 DEG C~+10 DEG C of 1 dew point of section (+5 DEG C of target value), -5 DEG C~-30 DEG C of 2 dew point of bringing-up section (- 20 DEG C of target value).By adjusting
The dew point value in galvanization annealing furnace area, the form restored using pre-oxidation are formed one layer of sponge iron in strip and surface of steel plate, mentioned
The wellability of high strip and steel plate plates one layer of pure zinc layer in strip and surface of steel plate, effectively hinders the corrosion of matrix,
Finished product has good processability, mechanical performance and corrosion resistance, and production window is wide, and simple process, control is stablized.
Finishing process of the present invention, finishing elongation percentage are 0.2~0.6%.
Passivation procedure of the present invention, 80~120 DEG C of passivation temperature.
Heating process of the present invention, heating temperature are 1200~1350 DEG C, and total heating time is 90~180min.
" GB/T2518-2008 connects with reference to national standard for the high-strength galvanized steel of this 1000MPa grades of two-phases and steel sheet product examination criteria
Continuous hot-dip galvanizing sheet steel and steel band ".
The beneficial effects of adopting the technical scheme are that 1, this galvanized steel and steel plate are using addition Mn and Cr
Member usually improves the harden ability of steel, increases the generation ratio of martensite during rapid cooling；It is added to Mo element, in phase transition process
The precipitation of martensite panel-shaped base body grain boundary carbide can be slowed down, so as to improve microstructure and property.2, Si is added in strip and steel plate
With Mn element, it is enriched in zinc-plated annealing process to strip and surface of steel plate, is easy to produce plating leakage, the present invention is by adjusting zinc-plated
The dew point value in annealing furnace area forms one layer of sponge iron in strip and surface of steel plate, improves band by way of pre-oxidation restores
The wettability of steel and steel plate plates one layer of pure zinc layer in strip and surface of steel plate, effectively hinders the corrosion of matrix.3, this hair
Bright finished product has good processability, mechanical performance and corrosion resistance, and tensile strength is in 1000MPa or more, yield strength
600-750MPa, elongation A50% >=10%, and production window is wide, simple production process, control is stablized, and is had before applying well
Scape.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
The present invention produces the high-strength galvanized steel of 1000MPa grades of two-phases and the method for steel plate is as follows:
It is heated, hot rolling, cold using continuous casting billet identical with the chemical component of galvanized steel described in table 1 and substrate steel sheet
It rolls, the high-strength galvanized steel of two-phase and steel plate is prepared in continuous zinc coating, finishing and passivation procedure.Heating process is using step
Stove heating is heated into formula, the heating temperature of continuous casting billet is 1200~1350 DEG C, and total heating time is 90~180min；Hot-rolled process
Finish rolling finishing temperature be 875~905 DEG C, coiling temperature be 620~750 DEG C；Cold rolling reduction ratio >=50% of cold rolling process；Even
The soaking temperature for continuing zinc-plated process is 760~840 DEG C, and first slow cooling is to 680~740 DEG C, then is cooled to 420~450 DEG C fastly；Zinc-plated temperature
It spends 458~462 DEG C of (zinc liquid temperature), -10 DEG C~+20 DEG C of preheating section dew point, -20 DEG C~+10 DEG C of 1 dew point of bringing-up section, bringing-up section 2
- 5 DEG C~-30 DEG C of dew point, annealing process 100~200s of soaking time, 10~20 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate
35~65 DEG C/s, 5~15s of galvanizing time；The finishing elongation percentage of finishing process is 0.2~0.6%；The passivation temperature of passivation procedure
It is 80~120 DEG C.Galvanized steel obtained by each embodiment and steel plate carry out performance detection, take lateral sample, sample marking distance 50mm,
The width of parallel-segment is 25mm, and the mechanical property detected is shown in Table 2.
Embodiment 1
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate, substrate chemical component and mass percentage are shown in Table 1, mechanics
Performance is shown in Table 2.
Production method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure, the specific steps are as follows:
1) heating process: continuous casting billet uses stepped heating stove heating, and the bringing-up section soaking temperature of continuous casting billet is 1280 DEG C,
Total heating time is 120min.
2) hot-rolled process: finish rolling finishing temperature is 880 DEG C, and coiling temperature is 680 DEG C.
3) cold rolling process: cold rolling reduction ratio 50%.
4) continuous zinc coating process: soaking temperature is 795 DEG C, and first slow cooling is to 710 DEG C, then is cooled to 445 DEG C fastly；Zinc-plated temperature
461 DEG C of (zinc liquid temperature)；+ 5 DEG C of preheating section dew point ,+3 DEG C of 1 dew point of bringing-up section, -20 DEG C of 2 dew point of bringing-up section；Annealing process heat preservation
Time 140s；15 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate 52.5 DEG C/s, galvanizing time 6s.
5) finishing process, finishing elongation percentage are 0.3%.
6) passivation procedure, passivation temperature are 90 DEG C.
Embodiment 2
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate, substrate chemical component and mass percentage are shown in Table 1, mechanics
Performance is shown in Table 2.
Production method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure, the specific steps are as follows:
1) heating process: continuous casting billet uses stepped heating stove heating, and the bringing-up section soaking temperature of continuous casting billet is 1350 DEG C,
Total heating time is 140min.
2) hot-rolled process: finish rolling finishing temperature is 875 DEG C, and coiling temperature is 690 DEG C.
3) cold rolling process: cold rolling reduction ratio 55%.
4) continuous zinc coating process: soaking temperature is 770 DEG C, and first slow cooling is to 700 DEG C, then is cooled to 420 DEG C fastly；Zinc-plated temperature
460 DEG C of (zinc liquid temperature)；- 10 DEG C of preheating section dew point ,+3 DEG C of 1 dew point of bringing-up section, -10 DEG C of 2 dew point of bringing-up section；Annealing process heat preservation
Time 160s；10 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate 65 DEG C/s, galvanizing time 8s.
5) finishing process, finishing elongation percentage are 0.35%.
6) passivation procedure, passivation temperature are 80 DEG C.
Embodiment 3
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate, substrate chemical component and mass percentage are shown in Table 1, mechanics
Performance is shown in Table 2.
Production method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure, the specific steps are as follows:
1) heating process: continuous casting billet uses stepped heating stove heating, and the bringing-up section soaking temperature of continuous casting billet is 1250 DEG C,
Total heating time is 100min.
2) hot-rolled process: finish rolling finishing temperature is 905 DEG C, coiling temperature 620.
3) cold rolling process: cold rolling reduction ratio 50%.
4) continuous zinc coating process: soaking temperature is 840 DEG C, and first slow cooling is to 740 DEG C, then is cooled to 450 DEG C fastly；Zinc-plated temperature
460 DEG C of (zinc liquid temperature)；+ 9 DEG C of preheating section dew point, -20 DEG C of 1 dew point of bringing-up section, -5 DEG C of 2 dew point of bringing-up section；Annealing process heat preservation
Time 130s；20 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate 35 DEG C/s, galvanizing time 7s.
5) finishing process, finishing elongation percentage are 0.3%.
6) passivation procedure, passivation temperature are 120 DEG C.
Embodiment 4
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate, substrate chemical component and mass percentage are shown in Table 1, mechanics
Performance is shown in Table 2.
Production method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure, the specific steps are as follows:
1) heating process: continuous casting billet uses stepped heating stove heating, and the bringing-up section soaking temperature of continuous casting billet is 1300 DEG C,
Total heating time is 160min.
2) hot-rolled process: finish rolling finishing temperature is 890 DEG C, and coiling temperature is 690 DEG C.
3) cold rolling process: cold rolling reduction ratio 55%.
4) continuous zinc coating process: soaking temperature is 825 DEG C, and first slow cooling is to 690 DEG C, then is cooled to 440 DEG C fastly；Zinc-plated temperature
460 DEG C of (zinc liquid temperature)；+ 5 DEG C of preheating section dew point ,+10 DEG C of 1 dew point of bringing-up section, -10 DEG C of 2 dew point of bringing-up section；Annealing process heat preservation
Time 110s；15 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate 56 DEG C/s, galvanizing time 5s.
5) finishing process, finishing elongation percentage are 0.6%.
6) passivation procedure, passivation temperature are 90 DEG C.
Embodiment 5
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate, substrate chemical component and mass percentage are shown in Table 1, mechanics
Performance is shown in Table 2.
Production method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure, the specific steps are as follows:
1) heating process: continuous casting billet uses stepped heating stove heating, and the bringing-up section soaking temperature of continuous casting billet is 1310 DEG C,
Total heating time is 90min.
2) hot-rolled process: finish rolling finishing temperature is 895 DEG C, and coiling temperature is 690 DEG C.
3) cold rolling process: cold rolling reduction ratio 50%.
4) continuous zinc coating process: soaking temperature is 800 DEG C, and first slow cooling is to 710 DEG C, then is cooled to 440 DEG C fastly；Zinc-plated temperature
458 DEG C of (zinc liquid temperature)；+ 20 DEG C of preheating section dew point ,+4 DEG C of 1 dew point of bringing-up section, -20 DEG C of 2 dew point of bringing-up section；Annealing process heat preservation
Time 180s；10 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate 55 DEG C/s, galvanizing time 8s.
5) finishing process, finishing elongation percentage are 0.3%.
6) passivation procedure, passivation temperature are 90 DEG C.
Embodiment 6
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate, substrate chemical component and mass percentage are shown in Table 1, mechanics
Performance is shown in Table 2.
Production method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure, the specific steps are as follows:
1) heating process: continuous casting billet uses stepped heating stove heating, and the bringing-up section soaking temperature of continuous casting billet is 1280 DEG C,
Total heating time is 130min.
2) hot-rolled process: finish rolling finishing temperature is 900 DEG C, and coiling temperature is 680 DEG C.
3) cold rolling process: cold rolling reduction ratio 50%.
4) continuous zinc coating process: soaking temperature is 790 DEG C, and first slow cooling is to 700 DEG C, then is cooled to 445 DEG C fastly；Zinc-plated temperature
460 DEG C of (zinc liquid temperature)；+ 5 DEG C of preheating section dew point ,+5 DEG C of 1 dew point of bringing-up section, -30 DEG C of 2 dew point of bringing-up section；Annealing process heat preservation
Time 100s；15 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate 54 DEG C/s, galvanizing time 6s.
5) finishing process, finishing elongation percentage are 0.2%.
6) passivation procedure, passivation temperature are 90 DEG C.
Embodiment 7
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate, substrate chemical component and mass percentage are shown in Table 1, mechanics
Performance is shown in Table 2.
Production method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure, the specific steps are as follows:
1) heating process: continuous casting billet uses stepped heating stove heating, and the bringing-up section soaking temperature of continuous casting billet is 1290 DEG C,
Total heating time is 100min.
2) hot-rolled process: finish rolling finishing temperature is 880 DEG C, and coiling temperature is 690 DEG C.
3) cold rolling process: cold rolling reduction ratio 55%.
4) continuous zinc coating process: soaking temperature is 810 DEG C, and first slow cooling is to 700 DEG C, then is cooled to 440 DEG C fastly；Zinc-plated temperature
460 DEG C of (zinc liquid temperature)；+ 6 DEG C of preheating section dew point ,+4 DEG C of 1 dew point of bringing-up section, -20 DEG C of 2 dew point of bringing-up section；Annealing process heat preservation
Time 170s；15 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate 55 DEG C/s, galvanizing time 12s.
5) finishing process, finishing elongation percentage are 0.3%.
6) passivation procedure, passivation temperature are 110 DEG C.
Embodiment 8
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate, substrate chemical component and mass percentage are shown in Table 1, mechanics
Performance is shown in Table 2.
Production method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure, the specific steps are as follows:
1) heating process: continuous casting billet uses stepped heating stove heating, and the bringing-up section soaking temperature of continuous casting billet is 1290 DEG C,
Total heating time is 95min.
2) hot-rolled process: finish rolling finishing temperature is 885 DEG C, and coiling temperature is 750 DEG C.
3) cold rolling process: cold rolling reduction ratio 55%.
4) continuous zinc coating process: soaking temperature is 805 DEG C, and first slow cooling is to 710 DEG C, then is cooled to 440 DEG C fastly；Zinc-plated temperature
459 DEG C of (zinc liquid temperature)；+ 7 DEG C of preheating section dew point ,+5 DEG C of 1 dew point of bringing-up section, -20 DEG C of 2 dew point of bringing-up section；Annealing process heat preservation
Time 120s；16 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate 50.5 DEG C/s, galvanizing time 7s.
5) finishing process, finishing elongation percentage are 0.3%.
6) passivation procedure, passivation temperature are 90 DEG C.
Embodiment 9
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate, substrate chemical component and mass percentage are shown in Table 1, mechanics
Performance is shown in Table 2.
Production method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure, the specific steps are as follows:
1) heating process: continuous casting billet uses stepped heating stove heating, and the bringing-up section soaking temperature of continuous casting billet is 1200 DEG C,
Total heating time is 180min.
2) hot-rolled process: finish rolling finishing temperature is 880 DEG C, and coiling temperature is 690 DEG C.
3) cold rolling process: cold rolling reduction ratio 50%.
4) continuous zinc coating process: soaking temperature is 795 DEG C, and first slow cooling is to 700 DEG C, then is cooled to 445 DEG C fastly；Zinc-plated temperature
460 DEG C of (zinc liquid temperature)；+ 6 DEG C of preheating section dew point ,+4 DEG C of 1 dew point of bringing-up section, -20 DEG C of 2 dew point of bringing-up section；Annealing process heat preservation
Time 200s；17 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate 55 DEG C/s, galvanizing time 15s.
5) finishing process, finishing elongation percentage are 0.3%.
6) passivation procedure, passivation temperature are 90 DEG C.
Embodiment 10
The high-strength galvanized steel of 1000MPa grades of two-phases and steel plate, substrate chemical component and mass percentage are shown in Table 1, mechanics
Performance is shown in Table 2.
Production method includes heating, hot rolling, cold rolling, continuous zinc coating, finishing and passivation procedure, the specific steps are as follows:
1) heating process: continuous casting billet uses stepped heating stove heating, and the bringing-up section soaking temperature of continuous casting billet is 1280 DEG C,
Total heating time is 90min.
2) hot-rolled process: finish rolling finishing temperature is 885 DEG C, and coiling temperature is 690 DEG C.
3) cold rolling process: cold rolling reduction ratio 50%.
4) continuous zinc coating process: soaking temperature is 760 DEG C, and first slow cooling is to 680 DEG C, then is cooled to 440 DEG C fastly；Zinc-plated temperature
462 DEG C of (zinc liquid temperature)；+ 6 DEG C of preheating section dew point ,+5 DEG C of 1 dew point of bringing-up section, -15 DEG C of 2 dew point of bringing-up section；Annealing process heat preservation
Time 145s；14 DEG C/s of slow cooling cooling rate, rapid cooling cooling rate 52 DEG C/s, galvanizing time 10s.
5) finishing process, finishing elongation percentage are 0.3%.
6) passivation procedure, passivation temperature are 100 DEG C.
The chemical component (wt%) of 1 embodiment 1-10 galvanized steel of table and substrate steel sheet
| Embodiment | C | Mn | Si | P | S | Als | Cr | Ti | Mo |
| 1 | 0.09 | 2.42 | 0.50 | 0.011 | 0.002 | 0.020 | 0.55 | 0.020 | 0.20 |
| 2 | 0.10 | 2.20 | 0.45 | 0.012 | 0.001 | 0.045 | 0.50 | 0.010 | 0.20 |
| 3 | 0.15 | 2.80 | 0.65 | 0.010 | 0.002 | 0.041 | 0.40 | 0.020 | 0.15 |
| 4 | 0.10 | 2.50 | 0.60 | 0.012 | 0.001 | 0.043 | 0.49 | 0.030 | 0.22 |
| 5 | 0.09 | 2.50 | 0.55 | 0.012 | 0.001 | 0.042 | 0.48 | 0.025 | 0.30 |
| 6 | 0.09 | 2.65 | 0.55 | 0.011 | 0.002 | 0.041 | 0.50 | 0.020 | 0.25 |
| 7 | 0.06 | 2.70 | 0.60 | 0.010 | 0.001 | 0.043 | 0.60 | 0.020 | 0.20 |
| 8 | 0.11 | 2.50 | 0.55 | 0.009 | 0.001 | 0.041 | 0.53 | 0.020 | 0.23 |
| 9 | 0.09 | 2.50 | 0.60 | 0.011 | 0.002 | 0.070 | 0.45 | 0.018 | 0.20 |
| 10 | 0.08 | 2.55 | 0.55 | 0.012 | 0.001 | 0.041 | 0.42 | 0.022 | 0.20 |
The mechanical property of 2 embodiment 1-10 products obtained therefrom of table
| Embodiment | Tensile strength MPa | Yield strength MPa | Elongation A50% |
| 1 | 1031 | 750 | 11 |
| 2 | 1000 | 600 | 11.5 |
| 3 | 1018 | 616 | 10.5 |
| 4 | 1019 | 645 | 11 |
| 5 | 1020 | 616 | 11 |
| 6 | 1002 | 620 | 12 |
| 7 | 1018 | 620 | 10.5 |
| 8 | 1015 | 610 | 11 |
| 9 | 1005 | 620 | 11 |
| 10 | 1010 | 600 | 10.5 |
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (5)
1. a kind of high-strength galvanized steel of 1000MPa grades of two-phase, which is characterized in that the galvanized steel substrate chemical component and quality
Percentage composition are as follows: C:0.06~0.15%, Mn:2.55~2.8%, Si:0.45~0.65%, Cr:0.40~0.60%, P≤
0.012%, S≤0.002%, Als:0.020~0.070%, Ti:0.010~0.030%, Mo:0.15~0.30%, remaining for Fe and
Not purgeable impurity；
A kind of preparation method of the high-strength galvanized steel of 1000MPa grades of two-phases includes heating, hot rolling, cold rolling, continuous zinc coating, light
Whole and passivation procedure, the hot-rolled process, heating temperature are 1200~1350 DEG C, and finish rolling finishing temperature is 875~905 DEG C, volume
Taking temperature is 620~750 DEG C；
The cold rolling process, cold rolling reduction ratio >=50%；
The continuous zinc coating process, soaking temperature are 760~840 DEG C；First slow cooling is to 680~740 DEG C, then is cooled to 420~450 fastly
℃；458~462 DEG C of zinc-plated temperature；
The continuous zinc coating process, annealing soaking time are 100~200s, 10~20 DEG C/s of slow cooling cooling rate, rapid cooling cooling
Rate 35~65 DEG C/s, 5~15s of galvanizing time；
The continuous zinc coating process, -10 DEG C~+20 DEG C of preheating section dew point ,+8 DEG C of target；- 20 DEG C~+10 DEG C of 1 dew point of bringing-up section,
+ 5 DEG C of target value；- 5 DEG C~-30 DEG C, -20 DEG C of target value of 2 dew point of bringing-up section.
2. a kind of preparation method of the high-strength galvanized steel of 1000MPa grades of two-phase, including heating, hot rolling, cold rolling, continuous zinc coating, light
Whole and passivation procedure, which is characterized in that the galvanized steel substrate chemical component and mass percentage are as follows: C:0.06~
0.15%, Mn:2.55~2.8%, Si:0.45~0.65%, Cr:0.40~0.60%, P≤0.012%, S≤0.002%, Als:
0.020~0.070%, Ti:0.010~0.030%, Mo:0.15~0.30%, remaining is Fe and not purgeable impurity；
The hot-rolled process, heating temperature are 1200~1350 DEG C, and finish rolling finishing temperature is 875~905 DEG C, and coiling temperature is
620~750 DEG C；
The cold rolling process, cold rolling reduction ratio >=50%；
The continuous zinc coating process, soaking temperature are 760~840 DEG C；First slow cooling is to 680~740 DEG C, then is cooled to 420~450 fastly
℃；458~462 DEG C of zinc-plated temperature；
The continuous zinc coating process, annealing soaking time are 100~200s, 10~20 DEG C/s of slow cooling cooling rate, rapid cooling cooling
Rate 35~65 DEG C/s, 5~15s of galvanizing time；
The continuous zinc coating process, -10 DEG C~+20 DEG C of preheating section dew point ,+8 DEG C of target；- 20 DEG C~+10 DEG C of 1 dew point of bringing-up section,
+ 5 DEG C of target value；- 5 DEG C~-30 DEG C, -20 DEG C of target value of 2 dew point of bringing-up section.
3. a kind of preparation method of the high-strength galvanized steel of 1000MPa grades of two-phases according to claim 2, which is characterized in that
The finishing process, finishing elongation percentage are 0.2~0.6%.
4. a kind of preparation method of the high-strength galvanized steel of 1000MPa grades of two-phases according to claim 2, which is characterized in that
The passivation procedure, 80~120 DEG C of passivation temperature.
5. a kind of preparation method of the high-strength galvanized steel of 1000MPa grades of two-phases according to claim 2, which is characterized in that
The heating process, heating temperature are 1200~1350 DEG C, and total heating time is 90~180min.
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| CN108796375B (en) * | 2018-06-28 | 2021-05-28 | 武汉钢铁有限公司 | Hot-galvanized high-strength steel with tensile strength of 1000MPa and reduction production method thereof |
| 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 |
| CN109402546A (en) * | 2018-11-16 | 2019-03-01 | 唐山钢铁集团有限责任公司 | A kind of continuous zinc coating production method for the high-strength steel preventing coating plating leakage |
| CN109504930B (en) * | 2018-12-20 | 2020-10-02 | 唐山钢铁集团有限责任公司 | Hot-dip galvanized steel sheet with tensile strength of more than 1300MPa and production method thereof |
| CN109735775A (en) * | 2019-02-12 | 2019-05-10 | 唐山不锈钢有限责任公司 | A kind of 1000MPa grades of superhigh-strength hot strip rolling and its production method |
| CN111893378A (en) * | 2020-07-13 | 2020-11-06 | 首钢集团有限公司 | A kind of low-cost high-plasticity cold-rolled galvanized steel sheet and preparation method thereof |
| CN112095047B (en) * | 2020-09-07 | 2021-12-24 | 鞍钢股份有限公司 | Cold-rolled hot-dip galvanized DH780 steel with excellent weldability and preparation method thereof |
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