CN108588614A - A kind of super thick coating production method - Google Patents
A kind of super thick coating production method Download PDFInfo
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- CN108588614A CN108588614A CN201810376235.9A CN201810376235A CN108588614A CN 108588614 A CN108588614 A CN 108588614A CN 201810376235 A CN201810376235 A CN 201810376235A CN 108588614 A CN108588614 A CN 108588614A
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- Prior art keywords
- strip
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- super thick
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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
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
-
- 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
Abstract
The present invention provides a kind of super thick coating production methods, belong to strip hot-dip galvanizing production field.The core ideas of this super thick coating production method is：Using improvement Sendzimir method, by improving unit TV values, improving unit operation speed, control zincincation temperature, adjustment zinc liquid ingredient, adjustment air knife parameter, and the comprehensive of the measures such as air knife edge dam and edge burner is combined to use, realize the steady production of super thick coated article.Its design parameter includes：The speed of service ＞ 40mpm of Continuous Hot Dip Galvanizing；When strip enters zinc pot, to 370 440 DEG C, zinc pot temperature is controlled to 457 463 DEG C strip temperature control；In galvanizing process, air knife is 400 760mm away from zinc liquid level；The air knife is 120 175mm away from strip distance；The gap of the air knife knife seam is centre 1.0 1.3mm, 1.5 1.8mm of edge；The air knife wind pressure is 20 45Kpa.With the above arrangement, the qualification rate of super thick coated article can be increased to 95% from 88%, the steady production of super thick coated article is realized.
Description
Technical field
The present invention relates to strip hot-dip galvanizing production fields, in particular to a kind of super thick coating production method.
Background technology
Strip hot-dip galvanizing super thick coated article belongs to the unconventional product in continuous hot galvanizing series of products, domestic at present raw
Although the product that production. art can be provided can reach requirement in coating overall thickness, uniformity, plating in thickness of coating
Defect is serious in terms of the consistency of layer appearance, the uniformity of zinc flower, cannot meet actual operation requirements.Therefore, so far,
Technique and technology for producing the super thick coated article for meeting universal requirement still belong to blank, the difficulty in terms of technology
It is very big, in terms of being mainly manifested in following three：
1, coating webbing defect
Strip webbing defect refers to that the thickness of coating of laterally (along the wide aspect of plate) is uneven, and edge thickness of coating is more than middle part
The thickness of coating divided.Such as：The thick difference of conventional coating edge generally 3%~5%；And thickness coating product, the thick difference of edge are but up to
10%~15%, and webbing range wide is about unilateral 50mm, causes to batch alice and can not produce when serious.
2, coating surface zinc wave defect
Coating surface zinc wave defect refers to the wave ghost with traffic direction generally vertically formed in steel strip surface
Striped.I.e. when surface of steel plate trickles, since coating is too thick, and zinc fluid viscosity is not enough to overcome coating weight zinc liquid, causes
The leaching of zinc liquid is hung and is formed, it so that thickness of coating is uneven, influences the performance of product.
3, surface zinc spends uneven defect
Surface zinc spends unevenness to be mainly shown as that zinc spends prominent and spike zinc flower, i.e. zinc flower to show apparent three-dimensional sense, touch
Concave-convex hand feeling is touched with, the effect of embossment is similar to.It can cause during the transport and storage after batching when serious, protrusion
Phase mutual friction generates friction stain, influences the anticorrosion effect subsequently used.
Invention content
The present invention provides a kind of super thick coating production methods, it is intended to solve super thick coating production method in the prior art and deposit
The above problem.
The invention is realized in this way：
A kind of super thick coating production method, using improvement Sendzimir method, parameter includes：
The speed of service ＞ 40mpm of Continuous Hot Dip Galvanizing；
When strip enters zinc pot, to 370-440 DEG C, zinc pot temperature is controlled to 457-463 DEG C strip temperature control；
In galvanizing process, air knife is 400-760mm away from zinc liquid level；The air knife is 120- away from strip distance
175mm；The gap of the air knife knife seam is intermediate 1.0-1.3mm, edge 1.5-1.8mm；The air knife wind pressure is 20-45Kpa.
In an embodiment of the present invention, the TV value ＞ 120mm*m/min of the continuous galvanizing line.
In an embodiment of the present invention, the TV values of the continuous galvanizing line are 150mm*m/min.
In an embodiment of the present invention, when the strip enters zinc pot, the gauge thickness of the strip with it is described
The relationship of belt steel temperature, the zinc pot temperature is as follows：
The strip of 1 different-thickness specification of table enters temperature table of comparisons when zinc pot
In an embodiment of the present invention, the zinc liquid ingredient in the zinc pot is：The zinc liquid includes 0.07- per hundred parts
0.08 part of antimony, 0.15-0.18 parts of aluminium.
In an embodiment of the present invention, when productive target zinc layers are the strip of 275g/m2, the rule of the strip
Lattice are as follows away from zinc face height, the knife lip distance, the knife gap, the relationship of the air knife wind pressure with the air knife：
When 2 target zinc layers of table are 275g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
。
In an embodiment of the present invention, when productive target zinc layers are the strip of 350g/m2, the rule of the strip
Lattice are as follows away from zinc face height, the knife lip distance, the knife gap, the relationship of the air knife wind pressure with the air knife：
When 3 target zinc layers of table are 350g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
In an embodiment of the present invention, when productive target zinc layers are the strip of 450g/m2, the rule of the strip
Lattice are as follows away from zinc face height, the knife lip distance, the knife gap, the relationship of the air knife wind pressure with the air knife：
When 4 target zinc layers of table are 450g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
In an embodiment of the present invention, when productive target zinc layers are the strip of 600g/m2, the rule of the strip
Lattice are as follows away from zinc face height, the knife lip distance, the knife gap, the relationship of the air knife wind pressure with the air knife：
When 5 target zinc layers of table are 600g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
In an embodiment of the present invention, the knife gap is the gap at knife seam middle part, the gap in knife tape edge portion
It is bigger 0.5mm than the knife gap.
The beneficial effects of the invention are as follows：The method and parameter provided through the invention improves unit TV values, improves unit fortune
Scanning frequency degree, control zincincation temperature, adjustment zinc liquid ingredient, adjustment air knife parameter, and air knife edge dam and edge is combined to burn
The comprehensive of the measures such as mouth uses, and the qualification rate of super thick coated article can be increased to 95% from 88%, realizes the production of super thick coating
The steady production of product.Yield rate is improved, and reduces production cost.
Specific implementation mode
To keep the purpose, technical scheme and advantage of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in mode, it is clear that described embodiment is
Some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this field
The every other embodiment that art personnel are obtained without creative efforts belongs to the model that the present invention protects
It encloses.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be on or below second feature
Be in direct contact including the first and second features, can also include the first and second features not be in direct contact but by them it
Between other characterisation contact.Moreover, fisrt feature is on second feature, top and above include fisrt feature second spy
Right over sign and oblique upper, or be merely representative of fisrt feature level height and be higher than second feature.Fisrt feature second feature it
Under, lower section and fisrt feature included below are immediately below second feature and obliquely downward, or be merely representative of fisrt feature level height
Less than second feature.
Embodiment one
A kind of super thick coating production method is present embodiments provided, this super thick coating production method is using improvement Senghi rice
That method, i.e. annealing furnace are divided into open fire scale-free heating furnace section and radiant tube reduction furnace section two parts, and strip is in scale-free heating furnace
It is heated by using advanced combustion control mode through open firing mode in section and air-fuel ratio is rationally set, reach fast
Fast scale-free heating and energy-saving best match.
Strip after direct firing furnace section enters reduction furnace section, and reduction furnace section is in the reproducibility for protecting gas full of nitrogen hydrogen
Radiant tube indirectly heat is used in atmosphere furnace.In reduction furnace section, strip low-level oxidation film on its surface while annealing is gone back
It is former.To meet the requirement of super large TV values, it is necessary to use powerful heating furnace.The annealing furnace use L-shaped structure, preheating section and
Open fire section is vertical, and radiant tube heating furnace section and cooling section are horizontal.
Preheating furnace section is preheated using the burning waste gas of heating furnace section, about 23 meters of effective heated length, 350 DEG C of highest furnace temperature,
150-300 DEG C of strip target preheating temperature；
Heating furnace section is equipped with the open flame combustion nozzle of non-oxidation burning, and in strip or so interlaced arrangement, ratio is carried out in 3 sections of furnace temperature
Combustion System, effective heated length about 25m, burner：36 sets, total heating power：16200kW, 1250 DEG C of highest furnace temperature, strip mesh
Mark 550-650 DEG C of heating temperature；
Radiant tube 30 is arranged in radiant tube bringing-up section furnace body length 36m, and always for thermal energy 4800KW, full section furnace temperature divides 3 sections,
ON-OFF (pulsed) is controlled, and highest furnace temperature is 920 DEG C, 720-760 DEG C of strip target heating temperature.
The speed of service of unit is made to reach 150mm*m/min by above scale-free heating technology, it is follow-up to adapt to
The setting of manufacturing parameter.
Its manufacturing parameter is improved as follows：
The thickness of coating rule of Continuous Hot Dip Galvanizing is that unit speed is higher, and thickness of coating is thicker；Hot dip zinc product
Feature is as the thicker increase coating weight of plate is also increasing, i.e., it is slab that thickness coating is often adjoint；And continuous galvanizing line
It is limited by production capacity, is that plate is thicker, actual motion speed is lower.It was verified that when production thickness coating product, unit
The speed of service is lower, more easy tos produce zinc wave, the zinc-plated defect such as zinc flow liner, webbing, edge dross, zinc layers are uneven, spike zinc is spent,
It is to solve the most effective approach of thickness coating surface defects of products to improve unit operation speed.
Under long-term practice evidence, it was demonstrated that the speed of service ＞ 40mpm of Continuous Hot Dip Galvanizing can ensure strip
Mass of foundation when zinc-plated, convenient for the quality of subsequent production and finished product.
And in order to ensure that unit operation speed reaches requirement, need the TV values for improving continuous galvanizing line.Continuous galvanizing line
TV value ＞ 120mm*m/min so that can ensure enough speeds of service when the production larger strip of thickness.
In the present embodiment, since technology above-mentioned provides so that the TV values of continuous galvanizing line are 150mm*m/min.
On the other hand the temperature to zinc liquid in strip and zinc pot is needed to be controlled to avoid zinc wave, zinc flow liner, webbing, zinc
The generation of the unequal various surface defects of layer.
If steel band enters, zinc pot temperature is too low, excessive less than the temperature in zinc liquid, occurs between steel band and zinc liquid in pot
It is the endothermic reaction, is easy the temperature band of zinc liquid is low, the too low mobility that can influence zinc liquid of temperature of zinc liquid and to steel plate
Wellability, is unfavorable for the formation of adhesion layer, and zinc wave, zinc flow liner, webbing, the unequal various surface defects of zinc layers also easy to produce.
If the temperature of steel plate is excessive higher than the temperature of zinc liquid, although being adhered on steel plate favorably to zinc liquid, temperature is excessively high
It can promote the reaction between zinc-iron, the bits in zinc pot can be increased in zinc pot, can make zinc-iron chemical combination when leaving zinc pot cooling
Nitride layer thickeies, and pure zinc layer is thinning, or even disappears, in the case of no pure zinc layer be do not have zinc flower-shape at, surface of steel plate
Will be linen a piece of, referred to as grey zinc layers.
Zinc pot temperature must be matched with temperature of steel strips, just can guarantee good coating internal performance and appearance property；And it is thick
Coated article often accompanies with think gauge together again, therefore thickness coating product must take into consideration the technique productions spy of think gauge product
Point.
When strip enters zinc pot, to 370-440 DEG C, zinc pot temperature is controlled to 457-463 DEG C strip temperature control；
Specifically, when strip enters zinc pot, the gauge thickness and belt steel temperature of strip, the relationship such as table 1 of zinc pot temperature
It is shown：
The strip of 1 different-thickness specification of table enters temperature table of comparisons when zinc pot
The ingredient of zinc liquid also has tremendous influence to zinc-plated final product quality.
The control of zinc liquid ingredient and zinc liquid temperature is traditional primarily directed to the product that thickness of coating is 275g/m2 or more
There is the zinc flower prod zinc liquid Composition Control to be：Zinc liquid includes 17.5 parts of antimony, 15-20 parts of aluminium per hundred parts, and surplus is zinc, such ingredient
It is controlled with temperature, in production thickness of coating, for 275g/m2 products below, there is no problem, but when producing the product of Z275 or more
It easy tos produce zinc flower to rise and fall, causes spike zinc to be spent when serious, influence product appearance.
Zinc flower rises and falls, the generation of spike zinc flower is concentrated mainly on the thick zinc layers product of slab plating, influences the main zinc of its formation
Liquid element is Sb, and Sb is to form the key element of zinc flower, while Al elements are due to fusing point ratio Zn high, also to the formation of spike zinc flower
Facilitation is generated, so being mainly to control the content of Sb and Al to zinc liquid Composition Control.In the present embodiment, zinc per hundred parts
Liquid includes 0.07-0.08 parts of antimony, 0.15-0.18 parts of aluminium, and surplus is zinc, zinc liquid within this range, can solve zinc flower very well
The problem of fluctuating.
In order to ensure that the quality of finished product, the present embodiment control the air knife parameter in galvanizing process.Galvanizing process
In, air knife is 400-760mm away from zinc liquid level；Air knife is 120-175mm away from strip distance；The gap of air knife knife seam is centre
1.0-1.3mm edge 1.5-1.8mm；Air knife wind pressure is 20-45Kpa.
In the present embodiment, when productive target zinc layers are the strip of 275g/m2, the specification and air knife of strip are high away from zinc face
Degree, knife lip distance, knife gap, the relationship of air knife wind pressure are as follows：
When 2 target zinc layers of table are 275g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
In upper table, knife gap is the gap at knife seam middle part, the big 0.5mm of gap-ratio knife gap in knife tape edge portion.
By arrangement above and improve unit TV values, raising unit operation speed, control zincincation temperature, adjustment zinc liquid
Ingredient, adjustment air knife parameter, and the comprehensive of the measures such as air knife edge dam and edge burner is combined to use, super thick coated article
Qualification rate can be increased to 95% from 88%, realize the steady production of super thick coated article.Yield rate is improved, and reduces life
Produce cost.
Embodiment two
Present embodiments provide a kind of super thick coating production method, the area of this super thick coating production method and embodiment one
It is not only that：Air knife parameter in super thick coating production method provided in this embodiment is used to produce the strip of 350g/m2.
In the present embodiment, when productive target zinc layers are the strip of 350g/m2, the specification and air knife of strip are high away from zinc face
Degree, knife lip distance, knife gap, the relationship of air knife wind pressure are as follows：
When 3 target zinc layers of table are 350g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
In upper table, knife gap is the gap at knife seam middle part, the big 0.5mm of gap-ratio knife gap in knife tape edge portion.
By arrangement above and improve unit TV values, raising unit operation speed, control zincincation temperature, adjustment zinc liquid
Ingredient, adjustment air knife parameter, and the comprehensive of the measures such as air knife edge dam and edge burner is combined to use, super thick coated article
Qualification rate can be increased to 95% from 88%, realize the steady production of super thick coated article.Yield rate is improved, and reduces life
Produce cost.
Embodiment three
Present embodiments provide a kind of super thick coating production method, the area of this super thick coating production method and embodiment one
It is not only that：Air knife parameter in super thick coating production method provided in this embodiment is used to produce the strip of 450g/m2.
In an embodiment of the present invention, when productive target zinc layers are the strip of 450g/m2, the specification and air knife of strip
It is as follows away from zinc face height, knife lip distance, knife gap, the relationship of air knife wind pressure：
When 4 target zinc layers of table are 450g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
In upper table, knife gap is the gap at knife seam middle part, the big 0.5mm of gap-ratio knife gap in knife tape edge portion.
By arrangement above and improve unit TV values, raising unit operation speed, control zincincation temperature, adjustment zinc liquid
Ingredient, adjustment air knife parameter, and the comprehensive of the measures such as air knife edge dam and edge burner is combined to use, super thick coated article
Qualification rate can be increased to 95% from 88%, realize the steady production of super thick coated article.Yield rate is improved, and reduces life
Produce cost.
Example IV
Present embodiments provide a kind of super thick coating production method, the area of this super thick coating production method and embodiment one
It is not only that：Air knife parameter in super thick coating production method provided in this embodiment is used to produce the strip of 600g/m2.
In an embodiment of the present invention, when productive target zinc layers are the strip of 600g/m2, the specification and air knife of strip
It is as follows away from zinc face height, knife lip distance, knife gap, the relationship of air knife wind pressure：
When 5 target zinc layers of table are 600g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
In upper table, knife gap is the gap at knife seam middle part, the big 0.5mm of gap-ratio knife gap in knife tape edge portion.
By arrangement above and improve unit TV values, raising unit operation speed, control zincincation temperature, adjustment zinc liquid
Ingredient, adjustment air knife parameter, and the comprehensive of the measures such as air knife edge dam and edge burner is combined to use, super thick coated article
Qualification rate can be increased to 95% from 88%, realize the steady production of super thick coated article.Yield rate is improved, and reduces life
Produce cost.
It these are only the preferred embodiment of the present invention, be not intended to restrict the invention, for the technology of this field
For personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of super thick coating production method, using improvement Sendzimir method, it is characterised in that：
The speed of service ＞ 40mpm of Continuous Hot Dip Galvanizing；
When strip enters zinc pot, to 370-440 DEG C, zinc pot temperature is controlled to 457-463 DEG C strip temperature control；
In galvanizing process, air knife is 400-760mm away from zinc liquid level；The air knife is 120-175mm away from strip distance；
The gap of the air knife knife seam is intermediate 1.0-1.3mm, edge 1.5-1.8mm；The air knife wind pressure is 20-45Kpa.
2. super thick coating production method according to claim 1, which is characterized in that the TV values ＞ of the continuous galvanizing line
120mm*m/min。
3. super thick coating production method according to claim 2, which is characterized in that the TV values of the continuous galvanizing line are
150mm*m/min。
4. super thick coating production method according to claim 2, which is characterized in that when the strip enters zinc pot, institute
Gauge thickness and the belt steel temperature, the relationship of the zinc pot temperature for stating strip are as follows：
The strip of 1 different-thickness specification of table enters temperature table of comparisons when zinc pot
5. super thick coating production method according to claim 3, which is characterized in that the zinc liquid ingredient in the zinc pot is：
The zinc liquid includes 0.07-0.08 parts of antimony, 0.15-0.18 parts of aluminium per hundred parts.
6. super thick coating production method according to claim 3, which is characterized in that productive target zinc layers are 275g/m2's
When the strip, the specification of the strip and the air knife are away from zinc face height, the knife lip distance, the knife gap, described
The relationship of air knife wind pressure is as follows：
When 2 target zinc layers of table are 275g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
7. super thick coating production method according to claim 3, which is characterized in that productive target zinc layers are 350g/m2's
When the strip, the specification of the strip and the air knife are away from zinc face height, the knife lip distance, the knife gap, described
The relationship of air knife wind pressure is as follows：
When 3 target zinc layers of table are 350g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
8. super thick coating production method according to claim 3, which is characterized in that productive target zinc layers are 450g/m2's
When the strip, the specification of the strip and the air knife are away from zinc face height, the knife lip distance, the knife gap, described
The relationship of air knife wind pressure is as follows：
When 4 target zinc layers of table are 450g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
9. super thick coating production method according to claim 3, which is characterized in that productive target zinc layers are 600g/m2's
When the strip, the specification of the strip and the air knife are away from zinc face height, the knife lip distance, the knife gap, described
The relationship of air knife wind pressure is as follows：
When 5 target zinc layers of table are 600g/m2, the air knife parameter lookup table of the strip of different-thickness specification is produced
10. according to claim 6-9 any one of them super thick coating production methods, which is characterized in that the knife gap is
The gap at knife seam middle part, the big 0.5mm of knife gap described in the gap-ratio in knife tape edge portion.
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| CN110684929A (en) * | 2019-10-13 | 2020-01-14 | 唐山钢铁集团有限责任公司 | Super-thick coating hot-dip galvanized steel strip for underground pipe gallery corrugated pipe and production method thereof |
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| CN113046674A (en) * | 2021-03-31 | 2021-06-29 | 常熟科弘材料科技有限公司 | Preparation process of thin hot-dip galvanized steel plate and thin hot-dip galvanized steel plate |
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| CN113755773A (en) * | 2021-08-12 | 2021-12-07 | 唐山钢铁集团高强汽车板有限公司 | Control method for surface quality of thick zinc-aluminum-magnesium strip steel with thick coating |
| CN115505863A (en) * | 2022-09-22 | 2022-12-23 | 包头钢铁（集团）有限责任公司 | Method for re-melting zinc after replacement of induction heater in zinc-aluminum-antimony process zinc pot |
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| CN113046674A (en) * | 2021-03-31 | 2021-06-29 | 常熟科弘材料科技有限公司 | Preparation process of thin hot-dip galvanized steel plate and thin hot-dip galvanized steel plate |
| CN113755773A (en) * | 2021-08-12 | 2021-12-07 | 唐山钢铁集团高强汽车板有限公司 | Control method for surface quality of thick zinc-aluminum-magnesium strip steel with thick coating |
| CN113755773B (en) * | 2021-08-12 | 2023-08-25 | 唐山钢铁集团高强汽车板有限公司 | Control method for surface quality of thick-specification thick-coating zinc-aluminum-magnesium strip steel |
| CN113755774A (en) * | 2021-08-26 | 2021-12-07 | 河钢股份有限公司 | Production method of super-thick zinc layer zinc-plated sheet without spangles |
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Application publication date: 20180928 |