CN109055867A - A method of producing tensile strength 540MPa high reaming heat zinc coating plate - Google Patents
A method of producing tensile strength 540MPa high reaming heat zinc coating plate Download PDFInfo
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- CN109055867A CN109055867A CN201811003097.6A CN201811003097A CN109055867A CN 109055867 A CN109055867 A CN 109055867A CN 201811003097 A CN201811003097 A CN 201811003097A CN 109055867 A CN109055867 A CN 109055867A
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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
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- 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
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- 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
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- 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
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Abstract
The invention discloses a kind of methods for producing tensile strength 540MPa high reaming heat zinc coating plate, belong to heat zinc coating plate technical field.Its technical solution are as follows: (1) prepare molten iron (2) for the molten iron of step (1) and carry out molten iron pretreatment, pneumatic steelmaking, the refining of LF furnace；(3) hot-strip of 1.0-4.0mm thickness is made through ESP producing line after the processing of LF furnace；(4) hot-strip that step (3) obtains is cooled down, carries out batching storage after cooling, hot rolling stock roll is made；(5) hot rolling stock roll made from step (4) turns the plating tinuous production progress hot galvanizing of PGL acid after examining, and heat zinc coating plate is made.Heat zinc coating plate tensile strength produced by the invention is greater than 540MPa, and compared to traditional heat zinc coating plate production method, present invention reduces process flows, have saved the energy and cost.
Description
Technical field
The present invention relates to heat zinc coating plate technical fields, more particularly to a kind of production tensile strength 540MPa high reaming hot dip
The method of zine plate.
Background technique
With the development of the automobile industry, in order to meet different use environments to the needs of auto parts and components corrosion resistance, with
And extend automotive service life, maintenance cost is reduced, common hot cold-reduced sheet, acid-cleaning plate have been unable to satisfy wanting for auto industry
It asks, heat zinc coating plate is one of the most effective approach for improving auto parts and components corrosion resistance.
Tensile strength 540MPa high reaming heat zinc coating plate is as a strain in advanced galvanized sheet, with its good forming
Performance is widely used in the components such as the automobile chassis, wheel and automobile panel of car shaped complexity.?
There has been more than 20 the development & production of tensile strength 540MPa high reaming heat zinc coating plate in the relatively advanced country of automobile industry
The history in year represents steel enterprise Japan JFE, Nippon Steel, and South Korea Posco, domestic Baosteel, Wuhan Iron and Steel Plant, Shoudu Iron and Steel Co are in production tensile strength
It maintains the leading position on 540MPa high reaming heat zinc coating plate hot rolling acid-cleaning plate.
The method of traditional production heat zinc coating plate is cast into slab for molten iron pretreatment → converter → LF furnace → RH furnace →, then
Shove charge heats about 2-3h to 1150-1200 DEG C, and then coming out of the stove carries out roughing → finish rolling → section cooling → and batch.After coilcooling
It is batched by uncoiling → welding → scale breading → continuous acid-washing → rinsing → straightening →, then carries out alkali cleaning → cold rolling → and batch, later
It dries → batches by annealing → continuous zinc coating → finishing → straightening → passivation →.It can be seen that traditional production hot galvanizing
Plate process is tedious complicated, higher cost.
Summary of the invention
The purpose of the present invention is to provide a kind of methods for producing tensile strength 540MPa high reaming heat zinc coating plate, are based on generation
The advanced ESP producing line in boundary and the zinc-plated tinuous production of PGL pickling are to produce the hot radical tensile strength of 1.0-4.0mm specification
The high reaming heat zinc coating plate of 540MPa.Compared with traditional heat zinc coating plate production method, the present invention by being further simplified process,
Heating furnace heating process, cold rolling and annealing operation are eliminated, process flow is shortened, improves production efficiency, has saved the energy.
Wherein, ESP producing line of the invention uses Siemens ESP producing line, i.e., completely without head thin slab continuous casting and rolling (Endless
Strip Production), refer to strip process without a head, hot rolling on from molten steel to downcoiler can be completed in 7 minutes
Completely continuous manufacturing with volume, truly realizes continuous casting and rolling.ESP producing line has Molten Steel Cleanliness height, casting blank solidification speed
The advantages that degree is fast, rolling time is short, as-cast structure is uniform, reduction in pass is big, Segregation of Chemical Composition is small, finished product even tissue,
And threading is not needed, the elongated thickness of hot rolled coil is uniform, and dimensional accuracy is high.
Pickling galvanization production line of the invention plates tinuous production using An Deli thatch PGL acid, uses in welding sequence
Laser welder replaces traditional lap welder, has well solved welding defect to the shadow of entire galvanized wire safe and stable operation
It rings, preferably ensure that weldquality；It is equipped with planisher before zinc-plated process, improves strip elongation percentage；Make in heating process
Replace gas heating with induction heating, by strip be heated to 460 DEG C or so to enter zinc pot temperature directly zinc-plated, relative to conventional plating
Zinc wire both reduces equipment investment, has been greatly reduced energy consumption, and also effectively reduce CO2With CO isothermal chamber gas
Discharge is conducive to environmental protection.Realize the mentality of designing " with hot Dai Leng ", it is ensured that producing line operation steady in a long-term.
The technical solution of the present invention is as follows:
A method of producing tensile strength 540MPa high reaming heat zinc coating plate, comprising the following steps:
(1) molten iron, constituent mass percentage are as follows: C:0.04-0.06%, Mn:1.10-1.60%, Si:0.20- are prepared
0.30%, P :≤0.012%, S :≤0.005%, Ti:0.02-0.04%, Al:0.02-0.03%, surplus Fe；
(2) molten iron of step (1) is subjected to molten iron pretreatment, pneumatic steelmaking, the refining of LF furnace；
(3) hot-strip of 1.0-4.0mm thickness is made through ESP producing line after the processing of LF furnace；
(4) hot-strip that step (3) obtains is cooled down, carries out batching storage after cooling, hot rolling stock roll is made；
(5) hot rolling stock roll made from step (4) turns the plating tinuous production progress hot galvanizing of PGL acid after examining, and is made
Heat zinc coating plate.
Wherein, in step (1), hot metal composition C:0.040-0.050%, interstitial atom solution strengthening improves the strong of steel
Degree.But C content height will also result in the reduction of plasticity toughness and the deterioration of welding performance.For high reaming heat zinc coating plate,
It is required that good deformation performance, therefore C content cannot be excessively high.Meanwhile to guarantee pourability, C content is below 0.06%.
Si :≤0.005%, ferrite former, Si can expand the area α+γ, and the temperature range for handling critical zone adds
Width is ferritic stabilizer.Si improves harden ability, intensity in conjunction with Mn.But it is excessively high to will form the iron scale for being not easy to remove,
The surface quality of steel is influenced, while reducing the deformation performance of steel.
Mn:1.10-1.60% has the function of solution strengthening, improves tensile strength, appropriateness improves harden ability, had both improved
Toughness improves processing performance again, and Mn minimizes red brittleness caused by S.But it is excessively high to reduce welding performance.And Mn content
Increase, martensite harden ability can be improved, be unfavorable for elongation percentage.
Trace Ti is added in Ti:0.02-0.04% in steel, and the intensity of steel can be improved, and improves the processability and weldering of steel
Connect performance.The chemical activity of Ti is higher, and the nonmetalloids such as C, N, O, S easily and in molten steel form compound.The solid solubility of Ti
It is lower, when Ti content is 0.01%-0.02% in steel, play the effect of solution strengthening.The presence of the particles such as the carbonitride of Ti
Delay recrystallization, prevents ferrite crystal grain from growing up, plays the role of refined crystalline strengthening.Ti beyond solid solubility will be with TiC in steel
Particle form is precipitated, and plays the role of precipitation strength.It is increased sharply intensity if excessively high, while reducing elongation percentage, optimum range
Between 0.02-0.04%.
In step (2), pretreated molten iron is successively passed through into converter smelting and LF furnace refines to obtain the iron of required ingredient
Water.Wherein, pneumatic steelmaking (converter steelmaking) is special mainly using liquid pig iron as the method for making steel of raw material
Point is caused by the oxygen in each component in the physical thermal and the pig iron of liquid pig iron in converter and feeding furnace is chemically reacted
Heat makes metal reach the ingredient and temperature that tapping requires.LF (Ladle Furnace) furnace, that is, spermatophore steel furnace, mainly by bucket
Interior white slag, in the atmosphere of hypoxemia (oxygen content 5%), into bucket, blowing argon gas is stirred and by graphite electrode to by turning
The molten steel of furnace is heated and is refined.
ESP producing line includes the refining of RH furnace, casting, roughing, IH electromagnetic induction heating, high-pressure water descaling and essence in step (3)
Roll process section.
Wherein, RH furnace refining full name is RH vacuum circulation degassing purifying method, and RH furnace is a kind of for producing the steel of high-quality steel
Water secondary refining process equipment, entire molten steel metallurgical reaction are carried out in the vacuum tank that block has refractory lining.
Molten iron after the refining of LF furnace, which enters in RH furnace, further to be refined, and molten iron out enters in conticaster, from even
The slab that casting machine comes out is directly entered roughing in roughing mills and intermediate base is made, and roughing inlet temperature is 960-1100 DEG C, finish to gauge
Temperature is within the scope of 840-850 DEG C.Then, intermediate base successively passes through rocking shears, piler and rotary hub type flying shear, wherein pendulum-type
It cuts and slab head wedge-shaped segment is segmented and is cut away, piler can be offline here when equipment below breaks down, and turns
Hub type flying shear shears intermediate base end to end.Intermediate base, which enters in IH electromagnetic induction heating furnace, later heats, and is heated to 1120-
1160 DEG C, finish rolling is carried out using mm finishing mill unit is entered after high-pressure water descaling, generates the hot-strip of 1.0-4.0mm thickness.
In step (4), the hot-strip that ESP producing line is produced is by the cooling of segmented layer, and cooling one section (i.e. first is cold
But the stage) cooling rate >=50 DEG C/s, after being cooled to 680-720 DEG C fastly, (i.e. the second cooling stage) 4-8s air-cooled on layer cold line is cooling
It carries out batching storage after to 460-510 DEG C.
In step (5) PGL acid plating tinuous production include uncoiler uncoiling, it is laser welder, descaling mill scale breading, continuous
Pickling, rinsing, smooth, washing, IH induction heating stove heating and zinc pot continuous zinc coating process section.
Wherein, in PGL acid plating tinuous production, hot rolling stock roll made from step (4) is passed through into uncoiler uncoiling, is swashed
After welding machine welding, descaling mill scale breading, into continuous acid-washing process section.HCl content is in continuous acid-washing process section, acid tank
40-70g/L, pickling temperature are 70-85 DEG C.After continuous acid-washing, using rinsing, planisher it is smooth, washing after, into IH incude
Stove heating is heated, wherein descaling mill elongation percentage 0.5-2.0%, planisher elongation percentage 0.5-2.5%, induction heating temperature are as follows: spoke
460-500 DEG C of pipe soaking zone is penetrated, air-cooled section 460-500 DEG C is sprayed, enters 450-480 DEG C of pot temperature；Induction heater dew point is -35
DEG C hereinafter, furnace pressure be 0.5-1.0mbar, hydrogen content be greater than 6%；The smooth elongation percentage in induction heating stokehold is less than or equal to
1.5%, smooth elongation percentage is 1.0-1.5% after furnace.Enter zinc pot after induction heating and carry out continuous zinc coating, heat zinc coating plate is made,
The mass percent of each ingredient of zinc liquid in zinc pot are as follows: Zn > 99%, Al:0.20 ± 0.05%, Sb≤0.02%, Fe≤
0.03%, other impurities≤0.015%；Zinc liquid temperature is 465 DEG C ± 5 DEG C.Then, finishing, straightening, blunt is carried out to heat zinc coating plate
Change, dry and batch storage, wherein polishing machine elongation percentage 0.5-2.5%, withdrawal straightening machine elongation percentage 0-0.8%, passivation uses trivalent
Chromium chromic acid passivation applies oil processing, more environmentally friendly compared with Cr VI chromic acid passivation using trivalent chromium chromic acid passivation.
The invention has the benefit that
The present invention is based on ESP producing lines and PGL acid to plate tinuous production, adopts new technology and produces hot radical tensile strength 540MPa
High reaming heat zinc coating plate, product thickness 1.0-4.0mm, coating weight 60-275g/ ㎡ (two-sided equal thickness coatings), tensile strength is big
In 540MPa, and there is good intensity to match with plasticity and toughness.To reach the product surface quality, using smooth rear washing work
Skill improves surface quality, reduces plating leakage defect.Simultaneously compared to traditional heat zinc coating plate production method, the present invention by into
One step simplifies process, eliminates heating furnace heating process, cold rolling and annealing operation, shortens process flow, substantially increases life
The energy is also saved while producing efficiency, about 300 yuan/ton of cost savings.
Specific embodiment
For a better understanding of the present invention, below with specific embodiment come the technical solution that the present invention will be described in detail, still
The present invention is not limited thereto.
Embodiment 1-4
The process flow of the method for production tensile strength 540MPa high reaming heat zinc coating plate of the invention are as follows: preparation institute first
The molten iron of ingredient is needed, wherein the ingredient of the molten iron of each embodiment is (unit wt.%) as shown in table 1, molten iron is pre-processed,
Pneumatic steelmaking and the refining of LF furnace enter ESP producing line later and produce hot-strip.In ESP producing line, molten iron by RH furnace refining,
Conticaster casting, roughing mills roughing, rocking shears, piler, rotary hub type flying shear, electromagnetic induction heating, high-pressure water descaling and essence
Hot-strip is generated after rolling, then, hot-strip obtained is batched into storage after segmented layer cooling, and it is former that hot rolling is made
Material volume.Hot rolling stock roll is gone to after examining on PGL acid plating tinuous production again, successively passes through uncoiler uncoiling, Laser Welding
Hot dip is made after machine welding, descaling mill scale breading, continuous acid-washing, rinsing, smooth, washing, electromagnetic induction heating, zinc pot continuous zinc coating
Zine plate carries out finishing to heat zinc coating plate obtained later, straightening, passivation, dries and batch storage.
Wherein, the technological parameter of each embodiment is as shown in table 2；(unit is the aluminium content of zinc liquid in the zinc pot of each embodiment
Wt.%) and zinc liquid temperature is as shown in table 3.
To the finished product thickness of heat zinc coating plate made from each embodiment, coating weight, yield strength, tensile strength and elongation percentage
Performance is tested, and test result is as shown in table 4.
Table 1
Table 2
Table 3
Table 4
As can be seen from Table 4, the method production of tensile strength 540MPa high reaming heat zinc coating plate is produced through the invention
Heat zinc coating plate, product thickness 1.0-4.0mm, coating weight 60-275g/ ㎡ (two-sided equal thickness coatings), is not required to by cold rolling and moves back
Fire processing, so that it may reach identical specification, thickness and precision is higher.Tensile strength is greater than 540MPa simultaneously, and has good strong
Degree is matched with plasticity and toughness.
To reach the product surface quality, using smooth rear washing process, surface quality is improved, plating leakage defect is reduced.
Simultaneously compared to traditional heat zinc coating plate production method, the present invention eliminates heating furnace heater by being further simplified process
Sequence, cold rolling and annealing operation, shorten process flow, substantially increase production efficiency, have saved the energy, and have saved cost about
300 yuan/ton.
Claims (10)
1. a kind of method for producing tensile strength 540MPa high reaming heat zinc coating plate, which comprises the following steps:
(1) molten iron, constituent mass percentage are prepared are as follows: C:0.04-0.06%, Mn:1.10-1.60%, Si:0.20-0.30%,
P :≤0.012%, S :≤0.005%, Ti:0.02-0.04%, Al:0.02-0.03%, surplus Fe；
(2) molten iron of step (1) is subjected to molten iron pretreatment, pneumatic steelmaking, the refining of LF furnace；
(3) hot-strip of 1.0-4.0mm thickness is made through ESP producing line after the processing of LF furnace；
(4) hot-strip that step (3) obtains is cooled down, carries out batching storage after cooling, hot rolling stock roll is made；
(5) hot rolling stock roll made from step (4) turns the plating tinuous production progress hot galvanizing of PGL acid after examining, and hot dip is made
Zine plate.
2. the method for production tensile strength 540MPa high reaming heat zinc coating plate as described in claim 1, which is characterized in that step
(3) ESP producing line includes the refining of RH furnace, casting, roughing, IH electromagnetic induction heating, high-pressure water descaling and finish-rolling process section in.
3. the method for production tensile strength 540MPa high reaming heat zinc coating plate as claimed in claim 2, which is characterized in that ESP
The roughing inlet temperature of producing line is 960-1100 DEG C, and finishing temperature is 840-865 DEG C.
4. the method for production tensile strength 540MPa high reaming heat zinc coating plate as described in claim 1, which is characterized in that step
(4) in, strip is cooling to use the cooling of segmented layer, cooling one section of cooling rate >=50 DEG C/s, after being cooled to 680-720 DEG C fastly, in layer
Air-cooled 4-8s on cold line carries out batching storage after being cooled to 460-510 DEG C.
5. the method for production tensile strength 540MPa high reaming heat zinc coating plate as described in claim 1, which is characterized in that step
(5) PGL acid plating tinuous production includes uncoiler uncoiling, laser welder, descaling mill scale breading, continuous acid-washing, rinsing, puts down in
Whole, washing, IH induction heating stove heating and zinc pot continuous zinc coating process section.
6. the method for production tensile strength 540MPa high reaming heat zinc coating plate as claimed in claim 5, which is characterized in that PGL
HCl content is 40-70g/L in the acid tank of the continuous acid-washing process section of acid plating tinuous production, and pickling temperature is 70-85 DEG C.
7. the method for production tensile strength 540MPa high reaming heat zinc coating plate as claimed in claim 5, which is characterized in that PGL
The heating temperature of the induction heater of acid plating production line are as follows: 460-500 DEG C of radiant tube soaking zone sprays air-cooled section 460-500 DEG C,
Enter 450-480 DEG C of pot temperature；Induction heater dew point is -35 DEG C hereinafter, furnace pressure is 0.5-1.0mbar, and hydrogen content is greater than 6%.
8. the method for production tensile strength 540MPa high reaming heat zinc coating plate as claimed in claim 5, which is characterized in that step
(5) in, PGL acid plates the descaling mill elongation percentage 0.5-2.0% of production line, planisher elongation percentage 0.5-2.5%, and induction heating stokehold is put down
Whole elongation percentage is less than or equal to 1.5%, and smooth elongation percentage is 1.0-1.5% after furnace.
9. the method for production tensile strength 540MPa high reaming heat zinc coating plate as claimed in claim 5, which is characterized in that PGL
In the zinc pot continuous zinc coating of acid plating tinuous production, the mass percent of each ingredient of zinc liquid are as follows: Zn > 99%, Al:0.20 ±
0.05%, Sb≤0.02%, Fe≤0.03%, other impurities≤0.015%；Zinc liquid temperature is 465 DEG C ± 5 DEG C.
10. the method for production tensile strength 540MPa high reaming heat zinc coating plate as described in claim 1, which is characterized in that right
Heat zinc coating plate made from step (5) carries out finishing, straightening, passivation, dries and batch processing, wherein polishing machine elongation percentage 0.5-
2.5%, withdrawal straightening machine elongation percentage 0-0.8%.
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| CN201811003097.6A CN109055867B (en) | 2018-08-30 | 2018-08-30 | Method for producing high-hole-expansion hot-dip galvanized plate with tensile strength of 540MPa |
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| CN201811003097.6A CN109055867B (en) | 2018-08-30 | 2018-08-30 | Method for producing high-hole-expansion hot-dip galvanized plate with tensile strength of 540MPa |
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Cited By (4)
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| CN109680219A (en) * | 2019-01-31 | 2019-04-26 | 日照钢铁控股集团有限公司 | A kind of production method of the 500MPa grade car hot radical without spangle high-strength galvanizing plate based on ESP production line |
| CN110359001A (en) * | 2019-08-31 | 2019-10-22 | 日照宝华新材料有限公司 | A kind of process and its equipment for producing think gauge hot substrate and having colored galvanizing production |
| CN110408875A (en) * | 2019-08-31 | 2019-11-05 | 日照宝华新材料有限公司 | A kind of corrosion proof process of control pickling hot dip zinc product passivating film |
| CN113584270A (en) * | 2021-08-09 | 2021-11-02 | 新疆八一钢铁股份有限公司 | Process for improving processability of steel for barrel industry |
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Denomination of invention: A method for producing high reaming hot dip galvanized sheet with tensile strength of 540Mpa Effective date of registration: 20211222 Granted publication date: 20210629 Pledgee: Rizhao Bank Co., Ltd Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2021980015819 |
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