CN110408941A - A kind of acid washing method of Multiphase Steel - Google Patents
A kind of acid washing method of Multiphase Steel Download PDFInfo
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- CN110408941A CN110408941A CN201910664141.6A CN201910664141A CN110408941A CN 110408941 A CN110408941 A CN 110408941A CN 201910664141 A CN201910664141 A CN 201910664141A CN 110408941 A CN110408941 A CN 110408941A
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- descaling bath
- pickling
- washing method
- acid washing
- steel
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
Abstract
The invention discloses a kind of acid washing methods of Multiphase Steel, the method includes pickling, steel band passes through the first descaling bath, the second descaling bath, third descaling bath, the 4th descaling bath, the 5th descaling bath successively arranged, first descaling bath, third descaling bath, the 4th descaling bath, is hydrochloric acid solution in the 5th descaling bath at the second descaling bath, concentration of hydrochloric acid is followed successively by 40~50g/L, 60~80g/L, 80~100g/L, 100~120g/L, 130~160g/L, and hydrochloric acid temperature is followed successively by 75~85 DEG C, 73~83 DEG C, 70~80 DEG C, 70~80 DEG C, 70~80 DEG C.The present invention considerably reduces the probability that blackspot and deficient pickling quality defect occur in acid cleaning process, and application effect is good, and production cost can be greatly lowered, and improves the competitiveness of product in market, has good application value.
Description
Technical field
The invention belongs to technical field of steel rolling, in particular to a kind of acid washing method of Multiphase Steel.
Background technique
It is advanced in automobile new model as auto industry is for the increasingly harsh of the requirements such as lightweight, safety, low emission
High-strength steel use ratio continues to increase.800MPa rank hot rolling acid-cleaning Multiphase Steel not only has higher tensile strength, expands there are also high
Pore performance and good welding performance can be widely applied to automobile chassis suspender, bumper, the life of the parts such as seat slide
It produces, there is vast potential for future development.But 800MPa rank Multiphase Steel is manufactured, and difficulty is big, the product certification period is long, market is quasi-
Enter threshold height, it is domestic almost without the iron and steel enterprise produced through the high-end automaker's certification of foreign side.
It is shallow slot turbulence acid dip line that 800MPa rank Multiphase Steel, which develops pickling line used, is found after pickling, hot rolling head
The black patch of easy appearance point within the scope of upper and lower surface 150m, sheet, and the logical volume of upper and lower surface shows different degrees of deficient acid
Situation is washed, cannot be met customer need, can not be delivered goods, and biggish economic loss is caused to company, seriously affects pickling
The production efficiency of unit.
Summary of the invention
In view of the above shortcomings of the prior art, the invention discloses a kind of acid washing methods of Multiphase Steel, to solve Multiphase Steel
The problem of easy appearance point of pickling occiput, sheet black patch.
The present invention through the following technical solutions to achieve the above objectives:
A kind of acid washing method of Multiphase Steel, the method includes pickling, Multiphase Steel steel band will pass through first successively to arrange
Descaling bath, the second descaling bath, third descaling bath, the 4th descaling bath, the 5th descaling bath, the first descaling bath, the second descaling bath, third
Descaling bath, the 4th descaling bath are hydrochloric acid solution in the 5th descaling bath, and concentration of hydrochloric acid is followed successively by 40~50g/L, 60~80g/L, 80
~100g/L, 100~120g/L, 130~160g/L, successively 75~85 DEG C of hydrochloric acid temperature, 73~83 DEG C, 70~80 DEG C, 70~
80 DEG C, 70~80 DEG C.
Further, 2 pairs of squeeze rollers, first descaling bath to the 5th every phase of descaling bath are set before first descaling bath
1 pair of squeeze roller is respectively set between two adjacent descaling baths, is additionally provided with 8 pairs of squeeze rollers after the 5th descaling bath.
Further, the squeeze roller is colloid, and hardness is 72 ± 2.5HRC.
Further, steel band will also be successively by aligning and prerinse before the pickling section.
Further, the aligning that steel band is used in the aligning pinches roller gap gap and is no more than 0.3mm.
Further, in the acid cleaning process threading speed control be 40~60m/min, whipping speed control be 40~
50m/min, speed of service control are 60~100m/min.
Further, during accelerating to the speed of service by the threading speed, velocity step ladder formula is incremented by, ladder
Control is 10m/min.
Further, it is decelerated in the whipping rate process by the speed of service, velocity step ladder formula is successively decreased, ladder control
It is made as 10m/min.
Further, after steel band pickling will also successively by rinsing, dry and batch.
Beneficial effects of the present invention include at least:
The invention discloses a kind of Multiphase Steel acid washing methods, and the method includes pickling, Multiphase Steel steel band will be by successively
The first descaling bath, the second descaling bath, third descaling bath, the 4th descaling bath, the 5th descaling bath of arrangement, the first descaling bath, second
Descaling bath, the 4th descaling bath, is hydrochloric acid solution in the 5th descaling bath at third descaling bath, concentration of hydrochloric acid be followed successively by 40~50g/L,
60~80g/L, 80~100g/L, 100~120g/L, 130~160g/L, successively 75~85 DEG C of hydrochloric acid temperature, 73~83 DEG C, 70
~80 DEG C, 70~80 DEG C, 70~80 DEG C.Concentration of hydrochloric acid, temperature process parameter in control descaling bath, make the hydrochloric acid in descaling bath
The match control of concentration and temperature improves the concentration and temperature of hydrochloric acid under the premise of guaranteeing that original tape tissue is not destroyed, can be with
The degree that hydrochloric acid is reacted with steel strip surface iron scale is improved, the pickling quality of steel strip surface is improved, prevents steel strip surface and owes acid
Wash the appearance with black patch.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of acid washing method step schematic diagram of Multiphase Steel；
Fig. 2 is using the black stains in the surface defect map after steel band pickling before the present invention；
Fig. 3 is to owe pickling defect map using the surface after steel band pickling before the present invention；
Fig. 4 is the steel strip surface figure after one pickling of embodiment.
Fig. 5 is the steel strip surface figure after two pickling of embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The invention discloses a kind of acid washing method of Multiphase Steel, Fig. 1 is a kind of pickling of Multiphase Steel of the embodiment of the present invention
Method, in conjunction with Fig. 1, this method comprises:
S1, to steel band uncoiling and threading enters straightener.The aligning of straightener pinches roller gap spacing and is no more than 0.3mm.
This can make the iron scale of steel strip surface sufficiently be crushed, remove, while can correct the plate shape of supplied materials, particularly with
The problems such as the problems such as camber, shape wave, improves to greatest extent, avoids plate shape problem that part is easily caused to owe pickling.It is simultaneously steel band
The good operation of pickling section provides safeguard.
S2 carries out prerinse to the steel band after aligning.After steel band aligning, operation to precleaning spout prerinse, precleaning spout
In desalted water by heat treatment, the surface of strip can be both rinsed, remove dust, granule foreign, can also be to steel
Band is preheated, the reaction speed that acid solution and scale on surface are accelerated in temperature of steel strips raising, more conducively steel band in pickling,
Improve the effect of pickling.
S3, the steel band of prerinse is successively in the first descaling bath, the second descaling bath, third descaling bath, the 4th descaling bath,
Pickling in five descaling baths.First descaling bath, third descaling bath, the 4th descaling bath, is hydrochloric acid in the 5th descaling bath at the second descaling bath
Solution, concentration of hydrochloric acid are followed successively by 40~50g/L, 60~80g/L, 80~100g/L, 100~120g/L, 130~160g/L, salt
Successively 75~85 DEG C of sour temperature, 73~83 DEG C, 70~80 DEG C, 70~80 DEG C, 70~80 DEG C.
Multiphase Steel belongs to high-strength steel for special purposes, is that the intensity of Multiphase Steel is high first, and yield strength is 950~980MPa, is resisted
Tensile strength is 900~950MPa, therefore threading speed is slow；Secondly, the iron scale of Multiphase Steel is thicker than common steel grade, it is
Removal iron scale, pickling speed are lower than common steel grade；Furthermore the constituent contents such as silicon, manganese are higher, the silicone content of Multiphase Steel
Generally 2~3%, cause the iron oxide skin depth of steel strip surface；Finally, the thickness of Multiphase Steel steel band is thicker, it is 3~4mm, threading
Speed also can be more slowly.In view of above four kinds of reasons, the pickling speed of Multiphase Steel is slow, thus in descaling bath the concentration of hydrochloric acid and
Temperature must be mutually matched control, just can guarantee the defect of deficient pickling and overpickling do not occur.
If the excessive concentration in descaling bath can accelerate hydrochloric acid to react with the iron scale of steel strip surface, cause overpickling
The steel strip surface of defect, overpickling blacks, and pit occur influences the surface quality of product；If the concentration in descaling bath is too low,
Whole iron scales of steel strip surface will cannot be removed, the deficient pickling defect such as stain, blackspot occur；If the hydrochloric acid in descaling bath
Temperature is excessively high, can make the temperature of steel band also can be very high, and squeeze roller is made of rubber, and resistance to extreme temperature is 85~90 DEG C, steel band temperature
Height is spent, squeeze roller carbonization is likely to result in, the squeeze roller after carbonization can fall black bits and be stained with steel strip surface, influence steel strip surface
Quality；If the temperature in descaling bath is too low, it is unfavorable for accelerating the reflection of hydrochloric acid and steel strip surface iron scale, causes to owe pickling
Etc. surface defects.Therefore, the concentration in descaling bath and temperature must be mutually matched control, can just improve pickling to greatest extent
Effect solves the problems, such as steel band head point, sheet black patch, will not cause overpickling problem.
In addition, the temperature of hydrochloric acid gradually decreases in descaling bath from the first descaling bath successively to the 5th descaling bath, this master
If because in production, by the hydrochloric acid solution pickling and preheating of the first descaling bath, steel band has washed off a part of iron oxide
Skin, and the temperature of steel band has built up, the pickling task amount and heating requirements of the second descaling bath are few compared with the first descaling bath, so the
The temperature of hydrochloric acid in two descaling baths is lower than the first descaling bath, and so on, the hydrochloric acid temperature in third descaling bath is lower than second
Descaling bath, the hydrochloric acid temperature in the 4th descaling bath are lower than third descaling bath, and the hydrochloric acid temperature in the 5th descaling bath is lower than tetracid
Washing trough.
It should be noted that the concentration of hydrochloric acid is successively to increase in the first descaling bath to the 5th descaling bath, with temperature change
Trend is exactly the opposite.This is because shallow slot turbulence acid dip line used in the present invention, is configured with acid solution recycling system.By
The high eo-acid of concentration of hydrochloric acid is supplemented in the first descaling bath, the spent acid low from the 5th descaling bath outflow concentration of hydrochloric acid.
Further, squeeze roller will be entered before steel band pickling, in pickling, after pickling.2 pairs are arranged before first descaling bath to squeeze
Dry roller, the first descaling bath are respectively arranged 1 pair of squeeze roller between the 5th every two adjacent slot of descaling bath, also set after the 5th descaling bath
It is equipped with 8 pairs of squeeze rollers.
Squeeze roller namely is set after prerinse before pickling, be in order to extract the remaining desalted water of steel strip surface, avoid by
Steel band brings the first descaling bath into, dilutes the acid strength of the first descaling bath and influences pickling effect.First descaling bath to the 5th acid
It is to avoid entering residual acid liquid band next in order to which the residual acid solution for carrying steel strip surface removes that squeeze roller is arranged between washing trough
Descaling bath dilutes acid strength, influences pickling effect.The squeeze roller being arranged after 5th descaling bath can remove to greatest extent
Remaining acid solution on steel band mitigates the pressure that subsequent processing namely rinses, while reducing sour consumption, has saved cost.
Further, squeeze roller is rubber material, and hardness is 72 ± 2.5HRC.
The hardness of control squeeze roller can guarantee its surface elasticity at constant pressure, and steel strip surface is clear after both can guarantee pickling
It is clean, and its abrasion can be reduced, the service life of squeeze roller is improved, so that pickling lines process section is stablized under high temperature, high speed
Operation.
Steel band after pickling is rinsed, dried and batched by S4.The steel band after pickling is rinsed by desalted water, with
The remaining acid solution of steel strip surface is cleaned up, the steel band after rinsing carries out steel strip surface drying after passing through squeeze roller again, after drying
Steel band run to coiling machine and batch in rolls.
It should be noted that threading speed control is 40~60m/min in the acid cleaning process, whipping speed control is
40~50m/min, speed of service control are 60~100m/min.The process of the speed of service is accelerated to by the threading speed
In, velocity step ladder formula is incremented by, Stepped control 10m/min.It is decelerated in the whipping rate process by the speed of service, speed
Spend step wise reduction, Stepped control 10m/min.Increased using velocity gradient, gradient reduction can guarantee steel band in threading, fortune
Be in gentle state during capable and whipping, can effectively prevent due to steel band operational process velocity variations it is too fast caused by
The generation of point, sheet black patch.
Using above technical scheme, the iron scale that steel strip surface may be implemented adequately is crushed, removes, effectively solving
Certainly in Multiphase Steel acid cleaning process the problem of the easy appearance point in head, sheet black patch and deficient pickling simultaneously, it is bad to avoid pickling
Caused rhythm of production is slack-off and roll rear strip and plate face darker in color occur, steel band extend it is uneven, there is shape wave and iron scale
Fall off roll marks defect caused by being sticked to roller surface.
The present embodiment produces Multiphase Steel in the plug-type pickling line of hot rolling, and squeeze roller glue-line hardness used is 72 ± 1.5HRC,
The velocity step ladder that threading speed accelerates to during the speed of service is somebody's turn to do is 10m/min, and the speed of service is decelerated to the mistake of whipping speed
Velocity step ladder is 10m/min in journey.
Embodiment one
In example 1, threading speed control is 40m/min, and speed of service control is 90m/min, whipping speed control
For 40m/min, table 1 is the concentration of hydrochloric acid of embodiment one and the state modulator range of temperature.
Table 1
| Project | First descaling bath | Second descaling bath | Third descaling bath | 4th descaling bath | 5th descaling bath |
| Concentration set point, g/L | 42 | 65 | 85 | 105 | 140 |
| Actual concentrations range, g/L | 41~43 | 64~66 | 84~86 | 103~107 | 138~142 |
| Desired temperature, DEG C | 84 | 82 | 78 | 78 | 75 |
| Actual temperature range, DEG C | 82~85 | 80~85 | 76~80 | 75~80 | 73~78 |
Embodiment two
In example 2, threading speed control is 60m/min, and speed of service control is 70m/min, whipping speed control
For 50m/min, table 2 is the concentration of hydrochloric acid and temperature process state modulator range in the descaling bath of embodiment two.
Table 2
| Project | First descaling bath | Second descaling bath | Third descaling bath | 4th descaling bath | 5th descaling bath |
| Concentration set point, g/L | 45 | 78 | 93 | 110 | 150 |
| Actual concentrations range, g/L | 43~48 | 75~80 | 90~95 | 108~113 | 147~152 |
| Desired temperature, DEG C | 78 | 78 | 77 | 75 | 72 |
| Actual temperature range, DEG C | 75~80 | 75~80 | 73~80 | 72~78 | 70~74 |
By the acid washing method of embodiment one and embodiment two, straightener can adequately be broken the iron scale of steel strip surface
Broken, removing, while the flatness defects such as shape wave for aligning steel band, suitable for pickling surely carry out providing good guarantee.After optimization
Acid strength and Temperature Matching control, the effective solution point on steel band head sheet blackspot, owe quality after the pickling such as pickling
Problem ensure that production efficiency, avoids the plate face darker in color occurred after rolling, shape wave occurs and iron scale falls off to be sticked to and roll
Caused by roller surface the problems such as roll marks defect.
Fig. 4 is the steel strip surface figure after one pickling of embodiment, and Fig. 5 is the steel strip surface figure after two pickling of embodiment, by scheming
In as can be seen that Fig. 4, Fig. 5 steel strip surface quality it is completely good, no dotted or sheet blackspot, owe pickling the defects of.Fig. 2 is
Using the black patch figure after steel band pickling before the present invention, Fig. 3 is to owe pickling using the surface after steel band pickling before the present invention to lack
Fall into figure.In conjunction with Fig. 2, Fig. 3 it is found that before using the present invention, steel band pickling rear surface has the black patch of the deficient pickling of dotted or sheet.
By Fig. 4, Fig. 5 and Fig. 2, Fig. 3 comparison it can be concluded that, using the present invention, steel band pickling rear surface is good, solves in the prior art
Existing dotted, sheet blackspot owes the problem of pickling defect, improves the pickling effect of Multiphase Steel, production can be greatly lowered
Cost improves the competitiveness of product in market, has good economic and social benefit.
Embodiment provided above is better embodiment of the invention, only is used to facilitate to illustrate the present invention, not to this hair
The bright limitation made under any form has usually intellectual in any technical field, if not departing from the proposed skill of the present invention
In the range of art feature, using the equivalent embodiment for locally changing or modifying made by disclosed technology contents, and
Without departing from technical feature content of the invention, in the range of still falling within the technology of the present invention feature.
Claims (9)
1. a kind of acid washing method of Multiphase Steel, which is characterized in that the method includes pickling, steel band passes through first successively to arrange
Descaling bath, the second descaling bath, third descaling bath, the 4th descaling bath, the 5th descaling bath, the first descaling bath, the second descaling bath, third
Descaling bath, the 4th descaling bath are hydrochloric acid solution in the 5th descaling bath, and concentration of hydrochloric acid is followed successively by 40~50g/L, 60~80g/L, 80
~100g/L, 100~120g/L, 130~160g/L, hydrochloric acid temperature are followed successively by 75~85 DEG C, 73~83 DEG C, 70~80 DEG C, 70
~80 DEG C, 70~80 DEG C.
2. a kind of acid washing method of Multiphase Steel according to claim 1, which is characterized in that be arranged before first descaling bath
1 pair of squeeze roller, institute is arranged between the every two adjacent descaling baths of the 5th descaling bath in 2 pairs of squeeze rollers, first descaling bath
8 pairs of squeeze rollers are additionally provided with after stating the 5th descaling bath.
3. a kind of acid washing method of Multiphase Steel according to claim 2, which is characterized in that the squeeze roller is colloid, firmly
Degree is 72 ± 2.5HRC.
4. a kind of acid washing method of Multiphase Steel according to claim 1, which is characterized in that steel band is also wanted before the pickling
Successively by aligning and prerinse.
5. a kind of acid washing method of Multiphase Steel according to claim 4, which is characterized in that steel band is used in the aligning
Aligning pinch roller gap gap be no more than 0.3mm.
6. a kind of acid washing method of Multiphase Steel according to claim 1, which is characterized in that in the pickling, steel band is worn
Tape speed control is 40~60m/min, and whipping speed control is 40~50m/min, and speed of service control is 60~100m/min.
7. a kind of acid washing method of Multiphase Steel according to claim 6, which is characterized in that steel band is added by the threading speed
During speed to the speed of service, velocity step ladder formula is incremented by, Stepped control 10m/min.
8. a kind of acid washing method of Multiphase Steel according to claim 6, which is characterized in that steel band is subtracted by the speed of service
Speed into the whipping rate process, successively decrease by velocity step ladder formula, Stepped control 10m/min.
9. a kind of acid washing method of Multiphase Steel according to claim 1, which is characterized in that, will also be successively after steel band pickling
By rinsing, dries and batch.
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| CN112157055A (en) * | 2020-08-20 | 2021-01-01 | 洛阳中硅高科技有限公司 | Cleaning treatment method, acid temperature control apparatus, and cleaning treatment apparatus |
| CN113430527A (en) * | 2021-06-03 | 2021-09-24 | 北京首钢股份有限公司 | Method for eliminating scratch defect of strip steel by acid cleaning |
| CN114807954A (en) * | 2022-04-29 | 2022-07-29 | 常熟科弘材料科技有限公司 | Strip steel pickling method with antirust effect and strip steel pickling line thereof |
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| CN110408941B (en) | 2021-12-03 |
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