CN106756562B - A kind of high strength galvanized steel plate and its production technology - Google Patents
A kind of high strength galvanized steel plate and its production technology Download PDFInfo
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- CN106756562B CN106756562B CN201710013880.XA CN201710013880A CN106756562B CN 106756562 B CN106756562 B CN 106756562B CN 201710013880 A CN201710013880 A CN 201710013880A CN 106756562 B CN106756562 B CN 106756562B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Abstract
The present invention provides a kind of high strength galvanized steel plate and its production technology, the mass percent of the chemical composition of the galvanized steel plain sheet is：0 ＜ C≤0.20%, 0 ＜ Si≤0.30%, 0 ＜ Mn≤0.50%, 0 ＜ P≤0.035%, 0 ＜ P≤0.035%, surplus is iron and inevitable impurity.Its production technology, including 5 pre-treatment, cleaning by degreasing, recrystallization annealing, galvanizing and post processing processes are also disclosed at the same time.The yield strength for the galvanized steel plain sheet that the present invention produces is more than or equal to 295MPa, tensile strength is more than or equal to 400MPa, elongation after fracture is more than or equal to 18%, disclosure satisfy that requirement of the various high-end structural members to material mechanical performance, improves the security of product, reduce weight of product itself, meet its requirement developed to lightness direction, save energy consumption, reduce cost, the competitiveness of product is improved, there is very strong practicality.
Description
Technical field
The invention belongs to technology field, more particularly, to a kind of high strength galvanized steel plate and its production technology.
Background technology
The purposes of hot-dip galvanizing sheet steel is as extensive, it is substantial amounts of be used to building, oil, chemical industry, household electrical appliances, automobile, hardware,
Etc. industry, industrial and business warehouse, workshop, three-dimensional large-scale park, large-scale structural member etc. are generally used for, it is all these to answer
With field, due to fierce market competition and national green production, energy-saving requirement are adapted to, various products are practical in satisfaction
Property and while prolong the service life, the requirement of the security, lightness of product must be complied with, exploitation has high intensity mechanical property
Can, have good corrosion resistance galvanized steel strip just seem very urgent.
The content of the invention
In view of this, the present invention is directed to propose a kind of high strength galvanized steel plate and its production technology, disclosure satisfy that various height
Requirement of the end structure part to material mechanical performance, improves the security of product, reduces weight of product itself, meets it to light-duty
Change the requirement that direction is developed, save energy consumption, reduce cost, improve the competitiveness of product, there is very strong practicality.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of high strength galvanized steel plate, the mass percent of the chemical composition of the galvanized steel plain sheet are：0 ＜ C≤0.20%,
0 ＜ Si≤0.30%, 0 ＜ Mn≤0.50%, 0 ＜ P≤0.035%, 0 ＜ S≤0.035%, surplus is for iron and inevitably
Impurity；
Further, the thickness of the sheet stock is 3.0-3.5mm.
A kind of production technology for producing the high strength galvanized steel plate described in claim 1 or 2, includes the following steps：
Step (1)：Pre-treatment：Sheet stock is passed through to the rolling of four frame tandem mill group four-pass, obtains chill state
Roll hard volume, spray treatment is then carried out to rolling hard winding steel surface using the injection pressure of 0.5MPa, after spray treatment
Strip scrubs belt steel surface using nylon brush roll by brushing stage；
Step (2)：Cleaning by degreasing：Strip after surface treated is passed sequentially through into chemical degreasing and electrolytic degreasing, is used
High-effective low foam skimmed milk, the maximum stream flow of degreaser is 500 liters/min, and the temperature of degreaser is 60-85 DEG C；
Step (3)：Recrystallization annealing：The strip for completing ungrease treatment enters continuous furnace progress recrystallization annealing, adopts
Directly heated with naked light and carried out with the mode of radiant tube indirectly heat, employed nitrogen as protective gas and sealing gas, use
Hydrogen includes bringing-up section, soaking zone and cold as reducibility gas, in furnace inner gas pressure 50-100Mpa, wherein heating furnace
But section；
Step (4)：Galvanizing：By the strip after recrystallization annealing in temperature is 455-465 DEG C of molten state zinc liquid it is complete
Into galvanizing, the stringent component for controlling zinc liquid：Aluminium content：0.25%-0.32%, Fe content：Less than or equal to 0.02%, antimony contains
Amount：0.08%-0.10%, surplus are zinc；
Step (5)：Post processing：The galvanizing that strip after galvanizing is carried out to straightening Passivation Treatment completion strip produces,
Obtain smooth galvanized steel plain sheet.
Further, the total deformation that four-pass rolls in the step (1) is 50%-88%.
Further, the thickness of the cold base steel plate obtained in the step (1) after rolling is 0.35mm-2.0mm, and width is
500-860mm。
Further, nylon brush roll rotates at a high speed against the direction that strip is run in the step (1), and brush roll speed is not low
In 1000 revs/min, brush roll is 10mm apart from belt steel surface drafts.
Further, the alkali point of chemical degreasing is 20-25 in the step (2), and the alkali point of electrolytic degreasing is 25-30, electricity
Current density is 20-30A/dm2。
Further, bringing-up section plate temperature is in the step (3)：620-650 DEG C, soaking zone plate temperature is：700-720 DEG C,
Cooling section plate temperature is：450-500℃.
Further, in the step (3) nitrogen requirement oxygen content：Less than or equal to 1ppm；Dew-point temperature：Less than etc.
In -60 DEG C；The requirement ammon residue amount of hydrogen：Less than or equal to 1ppm, oxygen content：Less than or equal to 1ppm.
Further, the elongation percentage that stretch bending is rectified in the step (5) is：0.3%-2.0%.
Relative to the prior art, a kind of high strength galvanized steel plate of the present invention and its production technology are with following excellent
Gesture：It disclosure satisfy that requirement of the various high-end structural members to material mechanical performance, improve the security of product, reduce product itself
Weight, meets its requirement developed to lightness direction, saves energy consumption, reduces cost, improve the competitiveness of product, have
Very strong practicality.Us, which are produced, according to above-mentioned technical process obtains the required high-strength hot-dip zinc-coated strips of SGC400, success
Deliver user to use, meet requirement of user's product to mechanical property and coating adhesion.
Embodiment
In addition to being defined, technical term used has universal with those skilled in the art of the invention in following embodiments
The identical meanings of understanding.Test reagent used, is routine biochemistry reagent unless otherwise specified in following embodiments；It is described
Experimental method, is conventional method unless otherwise specified.
With reference to embodiment, the present invention will be described in detail.
Embodiment 1
A kind of high strength galvanized steel plate, the mass percent of its chemical composition are：C：0.15%, Si：0.16%, Mn：
0.4%, P：0.035%, S：0.017%, surplus is iron and inevitable impurity.
The thickness of above-mentioned high strength galvanized steel plate is 1.5mm, width 765mm.
The thickness for the sheet stock that above-mentioned high strength galvanized steel plate uses is produced as 3.4mm.
A kind of production technology for producing above-mentioned high strength galvanized steel plate, includes the following steps：
Step (1)：Pre-treatment：Sheet stock is passed through to the rolling of four frame tandem mill group four-pass, obtains chill state
Roll hard volume, spray treatment is then carried out to rolling hard winding steel surface using the injection pressure of 0.5MPa, after spray treatment
Strip scrubs belt steel surface using nylon brush roll by brushing stage；
Step (2)：Cleaning by degreasing：Strip after surface treated is passed sequentially through into chemical degreasing and electrolytic degreasing, is used
High-effective low foam skimmed milk, the maximum stream flow of degreaser is 480 liters/min, and the temperature of degreaser is 78 DEG C；
Step (3)：Recrystallization annealing：The strip for completing ungrease treatment enters continuous furnace progress recrystallization annealing, adopts
Directly heated with naked light and carried out with the mode of radiant tube indirectly heat, employed nitrogen as protective gas and sealing gas, use
For hydrogen as reducibility gas, furnace inner gas pressure 96Mpa, wherein heating furnace are interior to include bringing-up section, soaking zone and cooling section；
Step (4)：Galvanizing：Strip after recrystallization annealing is completed into heat in the molten state zinc liquid that temperature is 455 DEG C
It is zinc-plated, the stringent component for controlling zinc liquid：Aluminium content：0.27%, Fe content：0.02%, antimony content：0.08%, surplus is zinc；
Step (5)：Post processing：The galvanizing that strip after galvanizing is carried out to straightening Passivation Treatment completion strip produces,
Obtain smooth galvanized steel plain sheet.
The total deformation that four-pass rolls in above-mentioned steps (1) is 66%.
The thickness of the cold base steel plate obtained in above-mentioned steps (1) after rolling is 1.5mm, width 765mm.
Nylon brush roll rotates at a high speed against the direction that strip is run in above-mentioned steps (1), and brush roll speed is 1500 revs/min,
Brush roll is 10mm apart from belt steel surface drafts.
The alkali point of chemical degreasing is 22 in above-mentioned steps (2), and the alkali point of electrolytic degreasing is 25, current density 30A/dm2。
Bringing-up section plate temperature is in above-mentioned steps (3)：620 DEG C, soaking zone plate temperature is：713 DEG C, cooling section plate temperature is：480
℃。
The oxygen content of nitrogen in above-mentioned steps (3)：0.7ppm；Dew-point temperature：-70℃；The ammon residue amount of hydrogen：0.5ppm,
Oxygen content：0.9ppm.
The elongation percentage that stretch bending is rectified in above-mentioned steps (5) is：0.3%.
Embodiment 2
A kind of high strength galvanized steel plate, the mass percent of the chemical composition of the galvanized steel plain sheet are：C：0.13%, Si：
0.17%, Mn:0.31%, P：0.022%, S：0.018%, surplus is iron and inevitable impurity.
The thickness of above-mentioned high strength galvanized steel plate is 0.7mm, width 850mm.
The thickness for the sheet stock that above-mentioned high strength galvanized steel plate uses is produced as 3.2mm.
A kind of production technology for producing above-mentioned high strength galvanized steel plate, includes the following steps：
Step (1)：Pre-treatment：Sheet stock is passed through to the rolling of four frame tandem mill group four-pass, obtains chill state
Roll hard volume, spray treatment is then carried out to rolling hard winding steel surface using the injection pressure of 0.5MPa, after spray treatment
Strip scrubs belt steel surface using nylon brush roll by brushing stage；
Step (2)：Cleaning by degreasing：Strip after surface treated is passed sequentially through into chemical degreasing and electrolytic degreasing, is used
High-effective low foam skimmed milk, the flow of degreaser is 480 liters/min, and the temperature of degreaser is 85 DEG C；
Step (3)：Recrystallization annealing：The strip for completing ungrease treatment enters continuous furnace progress recrystallization annealing, adopts
Directly heated with naked light and carried out with the mode of radiant tube indirectly heat, employed nitrogen as protective gas and sealing gas, use
For hydrogen as reducibility gas, furnace inner gas pressure 50Mpa, wherein heating furnace are interior to include bringing-up section, soaking zone and cooling section；
Step (4)：Galvanizing：Strip after recrystallization annealing is completed into heat in the molten state zinc liquid that temperature is 458 DEG C
It is zinc-plated, the stringent component for controlling zinc liquid：Aluminium content：0.32%, Fe content：0.017%, antimony content：0.09%, surplus is zinc；
Step (5)：Post processing：The galvanizing that strip after galvanizing is carried out to straightening Passivation Treatment completion strip produces,
Obtain smooth galvanized steel plain sheet.
The total deformation that four-pass rolls in above-mentioned steps (1) is 88%.
The thickness of the cold base steel plate obtained in above-mentioned steps (1) after rolling is 0.7mm, width 850mm.
Nylon brush roll rotates at a high speed against the direction that strip is run in above-mentioned steps (1), and brush roll speed is 1200 revs/min,
Brush roll is 10mm apart from belt steel surface drafts.
The alkali point of chemical degreasing is 25 in above-mentioned steps (2), and the alkali point of electrolytic degreasing is 30, current density 20A/dm2。
Bringing-up section plate temperature is in above-mentioned steps (3)：643 DEG C, soaking zone plate temperature is：720 DEG C, cooling section plate temperature is：462
℃。
The oxygen content of nitrogen in above-mentioned steps (3)：1ppm；Dew-point temperature：-68℃；The ammon residue amount of hydrogen：0.7ppm, oxygen
Content：1ppm.
The elongation percentage that stretch bending is rectified in above-mentioned steps (5) is：2.0%.
Embodiment 3
A kind of high strength galvanized steel plate, the mass percent of its chemical composition are：C：0.08%, Si：0.07%, Mn：
0.2%, P：0.015%, S：0.023%, surplus is iron and inevitable impurity.
The thickness of above-mentioned high strength galvanized steel plate is 0.35mm, width 860mm.
The thickness for the sheet stock that above-mentioned high strength galvanized steel plate uses is produced as 3.0mm.
A kind of production technology for producing above-mentioned high strength galvanized steel plate, includes the following steps：
Step (1)：Pre-treatment：Sheet stock is passed through to the rolling of four frame tandem mill group four-pass, obtains chill state
Roll hard volume, spray treatment is then carried out to rolling hard winding steel surface using the injection pressure of 0.5MPa, after spray treatment
Strip scrubs belt steel surface using nylon brush roll by brushing stage；
Step (2)：Cleaning by degreasing：Strip after surface treated is passed sequentially through into chemical degreasing and electrolytic degreasing, is used
High-effective low foam skimmed milk, the flow of degreaser is 490 liters/min, and the temperature of degreaser is 68 DEG C；
Step (3)：Recrystallization annealing：The strip for completing ungrease treatment enters continuous furnace progress recrystallization annealing, adopts
Directly heated with naked light and carried out with the mode of radiant tube indirectly heat, employed nitrogen as protective gas and sealing gas, use
For hydrogen as reducibility gas, furnace inner gas pressure 87Mpa, wherein heating furnace are interior to include bringing-up section, soaking zone and cooling section；
Step (4)：Galvanizing：Strip after recrystallization annealing is completed into heat in the molten state zinc liquid that temperature is 465 DEG C
It is zinc-plated, the stringent component for controlling zinc liquid：Aluminium content：0.25, Fe content：0.012%, antimony content：0.09%, surplus is zinc；
Step (5)：Post processing：The galvanizing that strip after galvanizing is carried out to straightening Passivation Treatment completion strip produces,
Obtain smooth galvanized steel plain sheet.
The total deformation that four-pass rolls in above-mentioned steps (1) is 82%.
The thickness of the cold base steel plate obtained in above-mentioned steps (1) after rolling is 0.35mm, width 860mm.
Nylon brush roll rotates at a high speed against the direction that strip is run in above-mentioned steps (1), and brush roll speed is 1200 revs/min,
Brush roll is 10mm apart from belt steel surface drafts.
The alkali point of chemical degreasing is 20 in above-mentioned steps (2), and the alkali point of electrolytic degreasing is 25, current density 30A/dm2。
Bringing-up section plate temperature is in above-mentioned steps (3)：625 DEG C, soaking zone plate temperature is：716 DEG C, cooling section plate temperature is：450
℃。
The oxygen content of nitrogen in above-mentioned steps (3)：0.77ppm；Dew-point temperature：-60℃；The ammon residue amount of hydrogen：1ppm, oxygen
Content：0.8ppm.
The elongation percentage that stretch bending is rectified in above-mentioned steps (5) is：1.2%.
Embodiment 4
A kind of high strength galvanized steel plate, the mass percent of its chemical composition are：C：0.18%, Si：0.24%, Mn：
0.47%, P：0.013%, S：0.035%, surplus is iron and inevitable impurity.
The thickness of above-mentioned high strength galvanized steel plate is 2.0mm, width 500mm.
The thickness for the sheet stock that above-mentioned high strength galvanized steel plate uses is produced as 3.5mm.
A kind of production technology for producing above-mentioned high strength galvanized steel plate, includes the following steps：
Step (1)：Pre-treatment：Sheet stock is passed through to the rolling of four frame tandem mill group four-pass, obtains chill state
Roll hard volume, spray treatment is then carried out to rolling hard winding steel surface using the injection pressure of 0.5MPa, after spray treatment
Strip scrubs belt steel surface using nylon brush roll by brushing stage；
Step (2)：Cleaning by degreasing：Strip after surface treated is passed sequentially through into chemical degreasing and electrolytic degreasing, is used
High-effective low foam skimmed milk, the flow of degreaser is 500 liters/min, and the temperature of degreaser is 60 DEG C；
Step (3)：Recrystallization annealing：The strip for completing ungrease treatment enters continuous furnace progress recrystallization annealing, adopts
Directly heated with naked light and carried out with the mode of radiant tube indirectly heat, employed nitrogen as protective gas and sealing gas, use
For hydrogen as reducibility gas, furnace inner gas pressure 100Mpa, wherein heating furnace are interior to include bringing-up section, soaking zone and cooling
Section；
Step (4)：Galvanizing：Strip after recrystallization annealing is completed into heat in the molten state zinc liquid that temperature is 463 DEG C
It is zinc-plated, the stringent component for controlling zinc liquid：Aluminium content：0.28%, Fe content：0.02%, antimony content：0.10%, surplus is zinc；
Step (5)：Post processing：The galvanizing that strip after galvanizing is carried out to straightening Passivation Treatment completion strip produces,
Obtain smooth galvanized steel plain sheet.
The total deformation that four-pass rolls in above-mentioned steps (1) is 50%.
The thickness of the cold base steel plate obtained in above-mentioned steps (1) after rolling is 2.0mm, width 500mm.
Nylon brush roll rotates at a high speed against the direction that strip is run in above-mentioned steps (1), and brush roll speed is 1500 revs/min,
Brush roll is 10mm apart from belt steel surface drafts.
The alkali point of chemical degreasing is 22 in above-mentioned steps (2), and the alkali point of electrolytic degreasing is 28, current density 20A/dm2。
Bringing-up section plate temperature is in above-mentioned steps (3)：650 DEG C, soaking zone plate temperature is：700 DEG C, cooling section plate temperature is：500
℃。
The oxygen content of nitrogen in above-mentioned steps (3)：0.9ppm；Dew-point temperature：-72℃；The ammon residue amount of hydrogen：0.8ppm,
Oxygen content：0.9ppm.
The elongation percentage that stretch bending is rectified in above-mentioned steps (5) is：1.8%.
After above-mentioned processing step, high strength galvanized steel plate sample made from taking-up, and its correlated performance is examined
Survey, draw following data, the results are shown in Table 1.
The mechanical property of 1 high strength galvanized steel plate of table
| Sequence number | Yield strength/MPa | Tensile strength/MPa | Elongation after fracture/% |
| Embodiment 1 | 345 | 450 | 29 |
| Embodiment 2 | 295 | 405 | 31 |
| Embodiment 3 | 305 | 412 | 18 |
| Embodiment 4 | 312 | 440 | 35 |
From above testing result, the high strength galvanized steel plate produced has good tensile property, it surrenders strong
Degree is more than or equal to 295MPa, and tensile strength is more than or equal to 400MPa, and elongation after fracture is more than or equal to 18%, disclosure satisfy that various height
Requirement of the end structure part to material mechanical performance, its yield strength, tensile strength and elongation after fracture have reached standard requirement,
And it is better than desired value, the security of product is improved, reduces weight of product itself, meets what it developed to lightness direction
It is required that saving energy consumption, cost is reduced, improves the competitiveness of product, there is very strong practicality.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention god.
Claims (8)
- A kind of 1. production technology of high strength galvanized steel plate, it is characterised in that：Include the following steps：Step (1)：Pre-treatment：Sheet stock is passed through to the rolling of four frame tandem mill group four-pass, obtains rolling for chill state Hard volume, then carries out spray treatment, the strip after spray treatment passes through using the injection pressure of 0.5MPa to rolling hard volume surface Brushing stage, scrubs belt steel surface using nylon brush roll；The thickness of the sheet stock is 3.0-3.5mm；Step (2)：Cleaning by degreasing：Strip after surface treated is passed sequentially through into chemical degreasing and electrolytic degreasing, using efficient Low foaming spent meal in use, the maximum stream flow of degreaser is 500 liters/min, and the temperature of degreaser is 60-85 DEG C；Step (3)：Recrystallization annealing：The strip for completing ungrease treatment enters continuous furnace progress recrystallization annealing, and use is bright Fire is directly heated to carry out with the mode of radiant tube indirectly heat, employs nitrogen as protective gas and sealing gas, using hydrogen As reducibility gas, include bringing-up section, soaking zone and cooling section in furnace inner gas pressure 50-100Mpa, wherein heating furnace；Step (4)：Galvanizing：Strip after recrystallization annealing is completed into heat in the molten state zinc liquid that temperature is 455-465 DEG C It is zinc-plated, the stringent component for controlling zinc liquid：Aluminium content：0.25%-0.32%, Fe content：Less than or equal to 0.02%, antimony content： 0.08%-0.10%, surplus are zinc；Step (5)：Post processing：The galvanizing that strip after galvanizing is carried out to straightening Passivation Treatment completion strip produces, and obtains Smooth galvanized steel plain sheet；The mass percent of the chemical composition of the galvanized steel plain sheet is：0 ＜ C≤0.20%, 0 ＜ Si≤ 0.30%, 0 ＜ Mn≤0.50%, 0 ＜ P≤0.035%, 0 ＜ S≤0.035%, surplus is iron and inevitable impurity.
- 2. the production technology of high strength galvanized steel plate according to claim 1, it is characterised in that：Four in the step (1) The total deformation of passes is 50%-88%.
- 3. the production technology of high strength galvanized steel plate according to claim 1, it is characterised in that：Rolled in the step (1) The thickness rolled up firmly that rolls obtained after system is 0.35mm-2.0mm, width 500-860mm.
- 4. the production technology of high strength galvanized steel plate according to claim 1, it is characterised in that：Buddhist nun in the step (1) Imperial brush roll rotates at a high speed against the direction that strip is run, and brush roll speed is not less than 1000 revs/min, and brush roll is depressed apart from belt steel surface Measure as 10mm.
- 5. the production technology of high strength galvanized steel plate according to claim 1, it is characterised in that：Step (2) middleization The alkali point for learning degreasing is 20-25, and the alkali point of electrolytic degreasing is 25-30, current density 20-30A/dm2。
- 6. the production technology of high strength galvanized steel plate according to claim 1, it is characterised in that：Add in the step (3) Hot arc plate temperature is：620-650 DEG C, soaking zone plate temperature is：700-720 DEG C, cooling section plate temperature is：450-500℃.
- 7. the production technology of high strength galvanized steel plate according to claim 1, it is characterised in that：Nitrogen in the step (3) The requirement oxygen content of gas：Less than or equal to 1ppm；Dew-point temperature：Less than or equal to -60 DEG C；The requirement ammon residue amount of hydrogen：It is less than or equal to 1ppm, oxygen content：Less than or equal to 1ppm.
- 8. the production technology of high strength galvanized steel plate according to claim 1, it is characterised in that：Drawn in the step (5) Strong elongation percentage is：0.3%-2.0%.
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