CN109731756A - A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products - Google Patents
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products Download PDFInfo
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- CN109731756A CN109731756A CN201811628264.6A CN201811628264A CN109731756A CN 109731756 A CN109731756 A CN 109731756A CN 201811628264 A CN201811628264 A CN 201811628264A CN 109731756 A CN109731756 A CN 109731756A
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Abstract
The invention discloses a kind of production methods of three-coat three-baking ageing resistance mild steel Coil Coating Products, comprising the following steps: S1, is surface-treated to the surface of Coil Coating Products substrate used thereof, then dries；S2, in step sl dry after substrate on primer coating layer, then dry, in drying course control plate PMT within the scope of 204~216 DEG C；S3, the plate obtained in step s 2 prime coat on coat floating coat, then dry, in drying course control plate PMT within the scope of 204~224 DEG C；S4, the plate obtained in step s3 floating coat on coat finishing coat finish coat, then dry, in drying course control plate PMT within the scope of 216~232 DEG C, obtain colored steel.It is an advantage of the invention that making the difference of colored steel yield strength and substrate yield strength after three-coat three-baking be less than setting value by three-coat three-baking technology controlling and process, to guarantee that colored steel is met customer need.
Description
Technical field
The present invention relates to household electrical appliances manufacturing fields, more specifically, it relates to a kind of three-coat three-baking ageing resistance mild steel color coating
The production method of plate.
Background technique
With the household electrical appliances color coating both at home and abroad to the gradually attention of energy-saving and emission-reduction, as following coated steel sheet development important directions
Plate is widely used in household electric appliances.And Coil Coating Products mostly by low carbon steel plate as substrate by a series of physical and
Chemical treatment is formed, and the materials such as low carbon steel plate are being placed at room temperature for a period of time, its mechanical performance after hot-working or cold working
Have occurred variation (such as hardness and yield strength increase, elongation percentage reduces), the extension at any time of the performance of this metal material and
The phenomenon that change referred to as timeliness, aging phenomenon shows as distracted or wrinkling occurred in production and application.
In order to reduce have potential it is distracted or corrugation risk coiled material be supplied to client, most of Coil Coating Products factory is for Coil Coating Products
Quality when factory has stringent regulation, is not in timeliness in some cycles to guarantee that Coil Coating Products are transported to customers' place
Phenomenon meets customer requirement.Although the timeliness of Coil Coating Products is known by most of Coil Coating Products factory, at present for colored steel ageing resistance
Property control all how to produce the substrate of ageing resistance in research mostly, as Authorization Notice No. be CN104498820 China specially
Benefit discloses a kind of micro- carbon aluminum-killed steel plate, chemical component mass percent are as follows: C:0.01-0.02%；Mn:0.1-0.2%；
Si≤0.025%；P≤0.015%；S≤0.015%；Als:0.03-0.04%, N:0.0020~0.0040%, surplus Fe
With other microelements.Above patent document also discloses a kind of method for producing above-mentioned micro- carbon aluminum-killed steel plate, by pair
The reasonable control of ingredient, is reduced to 0.01-0.02% for C content, can reduce the content of Fe3C and pearlite in matrix, thus
The elongation percentage for effectively improving product, it is available higher using lower bell-type annealing temperature and higher smooth elongation percentage
Yield strength guarantees the relatively high intensity of strip, not only contributes to the yield tensile ratio for improving product, also advantageously improves prolonging for product
Rate is stretched, meanwhile, improve the aging resistance energy of product.
It is color that the Chinese patent that Authorization Notice No. is CN103498101B for another example discloses a kind of inexpensive aging resistant household appliance
Coated plate is made of the raw material of following weight percent: C:0.010~0.030%, Si :≤0.030%, Mn:0.15~
0.35%, P :≤0.020%, S :≤0.020%, Als:0.020~0.060%, Ti:0.005~0.020%, N :≤
0.0040%, surplus is Fe and other inevitable impurity.The patent also discloses inexpensive aging resistant household appliance color coated sheet
Manufacturing method, comprising: molten iron-steelmaking, continuous casting, hot rolling, pickling, cold rolling, hot galvanizing, finishing, straightening, color coating, in hot galvanizing step
Continuous annealing temperature be 785~795 DEG C, the sum of elongation percentage in finishing step and straightening step is 1.0~1.2%.
In above-mentioned patented technology, the substrate of Coil Coating Products is all the content by the low content of carbon and other microelements,
It is subject to such as to increase protective gas and annealing process by process for making again, reaches the mesh for increasing the aging resistance of galvanized sheet
's.But the diversified demand of development and appearance now with color coating board industry, occur a large amount of three on the market at present and applies
Three Coil Coating Products dried, Coil Coating Products, since high temperature cools down again repeatedly, often aggravate Coil Coating Products timeliness after three-coat three-baking
Variation.
Summary of the invention
It is color in view of the deficiencies of the prior art, the present invention intends to provide a kind of three-coat three-baking ageing resistance mild steel
The production method of coated plate, its advantage is that: colored steel yield strength and substrate after three-coat three-baking are made by three-coat three-baking technology controlling and process
The difference of yield strength is less than setting value, reduces the trend for causing colored steel timeliness to be changed significantly because of three-coat three-baking technique, with
Guarantee that colored steel is met customer need.
To realize above-mentioned first purpose, the present invention provides the following technical scheme that a kind of three-coat three-baking ageing resistance low-carbon
The production method of steel Coil Coating Products, comprising the following steps:
S1, the surface of Coil Coating Products substrate used thereof is surface-treated, is then dried；
S2, in step sl dry after substrate on primer coating layer, then dry, in drying course control plate PMT exist
Within the scope of 190~224 DEG C；
S3, the plate obtained in step s 2 prime coat on coat floating coat, then dry, plate controlled in drying course
PMT is within the scope of 190~240 DEG C；
S4, the plate obtained in step s3 floating coat on coat finishing coat finish coat so that plate outer surface is transparent, then dry
It is dry, the PMT of plate is controlled in drying course within the scope of 204~250 DEG C, obtains colored steel.
Further, the PMT of plate is controlled in step S2 drying course within the scope of 204~216 DEG C；
The PMT of plate is controlled in step S3 in drying course within the scope of 204~224 DEG C；
The PMT of plate is controlled in step S4 in drying course within the scope of 216~232 DEG C.
Further, in step S1 substrate timeliness index < 40MPa, wherein when timeliness index refers to that substrate is made
Initial yield intensity and factory when for three-coat three-baking when yield strength difference.
Further, baking temperature when step S2, drying in step S3, step S4 is disposed as gliding temperature.
Further, in step S1, the method for surface treatment includes Passivation Treatment.
Further, in step S1, the plate after making surface treated layer dries within the scope of 180 ± 10 DEG C of baking temperature
It is dry.
In conclusion the invention has the following advantages:
The first, by the control in three-coat three-baking technique for PMT, so that colored steel yield strength and substrate are surrendered after three-coat three-baking
The difference of intensity is less than 40MPa, to guarantee that colored steel is met customer need, while also guaranteeing that coating is dried in plate drying course
It is dry, it is not in the situation that coating is not done；
The second, baking temperature is set as gliding temperature, on the one hand ensures the control of PMT, on the other hand, so that applying in drying course
Expect that drying effect is more preferable.
Specific embodiment
Invention is further described in detail with reference to embodiments.
Because forming colored steel after from substrate to three-coat three-baking, then store to outbound, the time is relatively fixed, Ren Menfa
The test of initial yield intensity is now carried out to substrate, substrate initial yield intensity is set as A1, then three-coat three-baking technique is processed
Colored steel afterwards carries out yield strength test, and the yield strength of colored steel is A after three-coat three-baking2, then A2With A1Difference set less than one
Definite value, this colored steel can meet the needs of client after placing set time factory, and if the difference of the two is greater than this
Setting value, then this colored steel dispatches from the factory after placing to customers' place, there is aging phenomenon in the later period, is not able to satisfy the demand of client.This
With setting value it is 40MPa in invention, i.e., how controls the technique of three-coat three-baking to guarantee the yield strength of colored steel after three-coat three-baking
A2With substrate yield strength A1Difference be less than 40MPa, meet production requirement, to reach this purpose to producer of the invention
Method is illustrated.
It is research object, the chemical component mass percent of substrate that following embodiment, which has selected a kind of low-carbon steel substrate, are as follows:
C:0.001%~0.003%, Si:0.15%~0.25%, Mn:0.5%~0.8%, P:0.06%~0.08%, S:<
0.01%, Ti:0.04%~0.07%, B:0.0004%~0.0008%, N:0.001%~0.003%, Al:0.025%~
0.065%, remaining is iron and inevitable impurity.
Embodiment 1 (minimum value)
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products provided in this embodiment, comprising the following steps:
S1, substrate surface is surface-treated, is then dried under 180 DEG C of baking temperature.
Wherein, substrate with a thickness of 0.4cm, the chemical component mass percent of substrate are as follows: C:0.002%, Si:0.2%,
Mn:0.65%, P:0.07%, S:0.005%；Ti:0.055%, B:0.0006%, N:0.002%, Al:0.045%, remaining
For iron and inevitable impurity, at this point, the initial yield intensity of substrate is 221MPa, and the timeliness index of substrate is 30MPa,
The difference of yield strength when wherein timeliness index referring to the initial yield intensity of substrate and dispatches from the factory for three-coat three-baking, is closed
In " a kind of household electrical appliances Coil Coating Products aging resistance detection that the judgment method of substrate timeliness index can be submitted on the same day by the applicant
The patent of method " can also be judged by other methods；The processing method of this field routine can be used in surface treatment, such as
Passivation Treatment can be realized by way of coating passivating solution on substrate, not repeated herein.In addition, being passivated processing
Before, the operation such as cleaning and degreasing can be carried out；
S2, in step sl dry after plate on primer coating layer, then dried in drying box, control panel in drying course
The PMT (peak temperature of plate) of material is 190 DEG C；
S3, the plate obtained in step s 2 prime coat on coat floating coat, then dried in drying box, in drying course
The PMT (peak temperature of plate) for controlling plate is 190 DEG C；
S4, the plate obtained in step s3 floating coat on coat finishing coat finish coat, then dry, dried in drying box
The PMT (peak temperature of plate) that plate is controlled in journey is 204 DEG C, obtains colored steel.
Colored steel after three-coat three-baking is beaten after rolling and storage, longitudinal sectional bundling, coiled storage, the crosscutting material at scale
It is packed in inventory to put, is flattened during crosscutting using joint straightener.
Embodiment 2
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 1, difference
It is in the PMT for controlling plate in step S2 drying course is 224 DEG C；
The PMT for controlling plate in step S3 in drying course is 240 DEG C；
The PMT for controlling plate in step S4 in drying course is 250 DEG C.
Embodiment 3
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 1, difference
It is in the PMT for controlling plate in step S2 drying course is 204 DEG C；
The PMT for controlling plate in step S3 in drying course is 204 DEG C；
The PMT for controlling plate in step S4 in drying course is 216 DEG C.
Embodiment 4
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 3, difference
It is in the PMT control of plate is 210 DEG C in drying course in step S2.
Embodiment 5
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 3, difference
It is in the PMT control of plate is 216 DEG C in drying course in step S2.
Embodiment 6
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 3, difference
It is in the PMT control of plate is 214 DEG C in drying course in step S3.
Embodiment 7
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 3, difference
It is in the PMT control of plate is 224 DEG C in drying course in step S3.
Embodiment 8
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 3, difference
It is in the PMT control of plate is 224 DEG C in drying course in step S4.
Embodiment 9
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 3, difference
It is in the PMT control of plate is 232 DEG C in drying course in step S4.
Embodiment 10
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, difference from Example 3 is, in step S2
In drying course, the PMT control of plate is 210 DEG C, and the PMT control of plate is 214 DEG C in step S3, plate in step S4
PMT control is 224 DEG C.
Embodiment 11
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, difference from Example 3 is, in step S2
In drying course, the PMT control of plate is 216 DEG C, and the PMT control of plate is 224 DEG C in step S3, plate in step S4
PMT control is 232 DEG C.
Embodiment 12
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, difference from Example 3 is, in step S1
Plate after chemical treatment layer coating is dried when baking temperature is 190 DEG C.
Embodiment 13
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, difference from Example 3 is, in step S1
Plate after chemical treatment layer coating is dried when baking temperature is 170 DEG C.
Embodiment 14
Substrate C content is higher, then substrate yield strength A1It is higher, during three-coat three-baking, as the PMT higher for choosing plate
When, the yield strength of colored steel is larger after three-coat three-baking, therefore in order to study the yield strength A of colored steel after three-coat three-baking2It is bent with substrate
Take intensity A1Difference whether be less than 40MPa, the present embodiment is provided that
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products is carried out according to the method for embodiment 8, with embodiment
11 the difference is that, the chemical component mass percent of substrate in step S1 are as follows: C:0.003%, Si:0.25%, Mn:
0.8%, P:0.08%, S:0.009%, Ti:0.07%, B:0.0008%, N:0.003%, Al:0.065%, remaining for iron with
And inevitable impurity, the initial yield intensity of substrate are 260MPa, the timeliness index of substrate is 34MPa.
Embodiment 15
Substrate C content is lower, then substrate yield strength A1It is lower, during three-coat three-baking, as the PMT higher for choosing plate
When, the yield strength of colored steel is larger after three-coat three-baking, therefore in order to study the yield strength A of colored steel after three-coat three-baking2It is bent with substrate
Take intensity A1Difference whether be less than 40MPa, the present embodiment is provided that
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products is carried out according to the method for embodiment 8, with embodiment
11 the difference is that, the chemical component mass percent of substrate in step S1 are as follows: C:0.001%, Si:0.15%, Mn:
0.5%, P:0.06%, Ti:0.04%, B:0.0004%, N:0.001%, Al:0.025%, remaining is for iron and unavoidably
Impurity, at this point, the initial yield intensity of substrate is 200MPa, the timeliness index of substrate is 25MPa.
Embodiment 16
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, difference from Example 3 is, in step S2
Substrate thickness is 0.6cm.
Comparative example 1
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 1, difference
It is in the PMT control of substrate is 185 DEG C in drying course in step S2.
Comparative example 2
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 1, difference
It is in the PMT control of substrate is 230 DEG C in drying course in step S2.
Comparative example 3
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 1, difference
It is in the PMT control of substrate is 185 DEG C in drying course in step S3.
Comparative example 4
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 1, difference
It is in the PMT control of substrate is 245 DEG C in drying course in step S3.
Comparative example 5
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 1, difference
It is in the PMT control of substrate is 200 DEG C in drying course in step S4.
Comparative example 6
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 1, difference
It is in the PMT control of substrate is 255 DEG C in drying course in step S4.
Comparative example 7
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 1, difference
Be in, in step S2 in drying course, the PMT of plate control is 185 DEG C, and the PMT control of plate is 185 DEG C in step S3,
The PMT control of plate is 200 DEG C in step S4.
Comparative example 8
A kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, is operated according to method in embodiment 1, difference
Be in, in step S2 in drying course, the PMT of plate control is 230 DEG C, and the PMT control of plate is 245 DEG C in step S3,
The PMT control of plate is 255 DEG C in step S4.
Performance detection test
Embodiment 1-16 and comparative example 1-6 is subjected to Mechanics Performance Testing, it is as shown in the table to obtain result:
As seen from the above table, during can be seen that three-coat three-baking by the data of embodiment and comparative example, primer coating layer process
The PMT of middle control plate controls the PMT of plate in 190~240 DEG C of models within the scope of 190~224 DEG C, during coating floating coat
The yield strength of the PMT of the plate colored steel obtained within the scope of 204~250 DEG C is controlled in enclosing, during coating finishing coat finish coat
Difference between substrate yield strength is less than 40MPa, guarantees that colored steel meets the needs of client is for aging resistance；In conjunction with right
The data of ratio, it can be seen that the plate PMT that any one step is controlled during three-coat three-baking is less than claim 1
The value range of PMT in middle drying course, the coating are unable to fully dry, if having one during prime coat and floating coat are dried and applied
Step PMT is greater than the value range of PMT in drying course in claim 1, then the coating adhesion is bad, and specific manifestation form is
One side coating is easy cracking, and being on the other hand observed that between coating by cupping experiment can be easily separated, and is not able to satisfy life
Production demand；And when plate PMT is greater than 250 DEG C during finishing coat finish coat is dried and applied, the yield strength of colored steel made from one side
A2With substrate initial yield intensity A1Between difference be greater than 40MPa, the adhesive force of another aspect coating is bad, is unsatisfactory for producing
Demand；If the model that plate PMT during applying is respectively less than in claim 1 PMT in drying course is dried during three-coat three-baking three times
Value is enclosed, colored steel is unable to fully dry, if PMT is all larger than in claim 1 value range of PMT in drying course, is on the one hand made
Colored steel yield strength A2With substrate initial yield intensity A1Between difference be greater than 40MPa, the adhesive force of another aspect coating
It is bad, it is unsatisfactory for production requirement；
For timeliness index be less than 40MPa substrate, this production method be it is applicable, be made colored steel yield strength and substrate bend
The difference taken between intensity is less than 40MPa, meets production requirement；
Embodiment 1 in embodiment 16 as can be seen that other conditions it is constant, substrate thickness be 0.4cm and 0.6cm when finally measure
Yield strength it is close, illustrate that this method can be adapted for the substrate of different-thickness, it is only necessary to guarantee PMT during three-coat three-baking
Control is in claim 1 within the scope of PMT.
Illustrate: oven temperature can be set to gradual change type temperature when drying in step S2, S3, S4 in above-described embodiment
Degree so that the drying effect of plate is more preferable, in above-described embodiment with oven temperature in step S2 be set as three-stage gliding temperature,
Oven temperature is set as that four-part form gliding temperature, oven temperature is set as three-stage gliding temperature in step S4 in step S3
It is illustrated, specifically, 182 DEG C is set as in step S2, in the first stage, second stage is set as 275 DEG C, and the phase III sets
It is set to 283 DEG C；
It is set as 170 DEG C in step S3, in the first stage, second stage is set as 212 DEG C, and the phase III is set as 256 DEG C, and
Four stages were 260 DEG C；
204 DEG C are set as in step S4, in the first stage, second stage is set as 290 DEG C, and the phase III is set as 305 DEG C；
Oven temperature is controlled with this in drying course of the present invention, each embodiment or right is reached by changing baking time
The requirement of PMT in ratio, i.e., to achieve the purpose of the present invention, it is only necessary to the PMT in each stage in rate-determining steps S2, S3, S4
It is required that can be realized by adjusting oven temperature with baking time to reach the requirement of PMT.
Coating in the present invention in step S2, S3, S4 for plate prime coat, floating coat and finishing coat finish coat, prime coat
For erosion resistant coating, floating coat is coating of the realization demand as applied the purpose of color, and finishing coat finish coat is plate hyaline layer, therefore of the invention
In three-coat three-baking technique can be used for the front of plate, at this point, the reverse side of plate can be a painting one baking, be also possible to two paintings
Two dry, and three-coat three-baking technique can be used for the front and back of plate.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (6)
1. a kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products, which comprises the following steps:
S1, the surface of Coil Coating Products substrate used thereof is surface-treated, is then dried；
S2, in step sl dry after substrate on primer coating layer, then dry, in drying course control plate PMT exist
Within the scope of 190~224 DEG C；
S3, the plate obtained in step s 2 prime coat on coat floating coat, then dry, plate controlled in drying course
PMT is within the scope of 190~240 DEG C；
S4, the plate obtained in step s3 floating coat on coat finishing coat finish coat so that plate outer surface is transparent, then dry
It is dry, the PMT of plate is controlled in drying course within the scope of 204~250 DEG C, obtains colored steel.
2. a kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products according to claim 1, which is characterized in that
The PMT of plate is controlled in step S2 drying course within the scope of 204~216 DEG C；
The PMT of plate is controlled in step S3 in drying course within the scope of 204~224 DEG C；
The PMT of plate is controlled in step S4 in drying course within the scope of 216~232 DEG C.
3. a kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products according to claim 1, which is characterized in that
The timeliness index < 40MPa of substrate in step S1, wherein timeliness index refers to initial yield intensity when substrate is made and goes out
The difference of yield strength when factory for three-coat three-baking.
4. a kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products according to claim 1, which is characterized in that
Step S2, baking temperature when drying in step S3, step S4 is disposed as gliding temperature.
5. a kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products according to claim 1, which is characterized in that
In step S1, the method for surface treatment includes Passivation Treatment.
6. a kind of production method of three-coat three-baking ageing resistance mild steel Coil Coating Products according to claim 1, which is characterized in that
In step S1, the plate after making surface treated layer is dried within the scope of 180 ± 10 DEG C of baking temperature.
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| CN105599388A (en) * | 2014-11-25 | 2016-05-25 | 合肥海尔特种钢板研制开发有限公司 | Wire drawing type printed color steel plate for household electrical appliances and production method thereof |
| CN106313785A (en) * | 2015-07-02 | 2017-01-11 | 合肥海尔特种钢板研制开发有限公司 | Three-colored metal imitate steel brushed printed colored steel plate |
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