CN106540993B - Hot rolling acid-cleaning plate - Google Patents
Hot rolling acid-cleaning plate Download PDFInfo
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- CN106540993B CN106540993B CN201611086290.1A CN201611086290A CN106540993B CN 106540993 B CN106540993 B CN 106540993B CN 201611086290 A CN201611086290 A CN 201611086290A CN 106540993 B CN106540993 B CN 106540993B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a kind of hot rolling acid-cleaning plates, are prepared by the following method：The slab of 110 ~ 150m/min is taken, successively through six sections of 10 ~ 20min of turbulence acid dip at multiple bending straightening, 70 ~ 80 DEG C（A concentration of 190~210g/l of initial HCl）, four sections of adverse current washings at 70 ~ 80 DEG C, hot-air seasoning is handled at 95 ~ 105 DEG C, wind to obtain the final product, there is pickling effect appropriate.
Description
Technical field
The present invention relates to acid-washed metal material technologies, more particularly to hot rolling acid-cleaning plate.
Background technology
Hot rolling acid-cleaning plate is the plank formed after pickling unit removes oxide layer, trimming, finishing using slab as raw material,
Main manufacturing procedure therein has welding, pickling, smooth, trimming, oiling etc., the surface quality and requirement of hot rolling acid-cleaning plate
It is the ideal substitute products of part hot rolled plate and cold-reduced sheet between hot rolled plate and cold-reduced sheet.
Compared with common hot rolled plate, hot rolling acid-cleaning plate needs to remove its scale on surface, to improve the surface matter of steel
Amount, convenient for welding, oiling and japanning.The major surfaces quality problems of hot rolling acid-cleaning plate be overpickling (surface darkly, Huang Dengyan
Color), owe pickling (iron scale does not completely remove) etc..
Invention content
The object of the present invention is to provide a kind of hot rolling acid-cleaning plate, the problem of which solve overpickling or deficient pickling, there is acid
Wash effect appropriate.
The present invention above-mentioned technical purpose technical scheme is that：
A kind of hot rolling acid-cleaning plate, is prepared by the following method：
Step 1：The slab in transmission process is taken, through nine roller straightener straightening processings, makes the multiple bending straightening of slab；
Step 2：The slab handled through step 1 is subjected to six sections of pickling, when the form of pickling is turbulence acid dip and total pickling
Between be 10~20min；The pickling solution temperature of every section of pickling is the initial HCl a concentration of 190 of 70~80 DEG C and pickling solution
~210g/l；In the pickling solution that six sections of pickling use, the highest of iron content is limited to 250g/l；
Step 3：The slab handled through step 2 is subjected to four sections of washings, the form of washing is countercurrent rinsing, every section of washing
Water temperature is 70~80 DEG C；
Step 4：The slab handled through step 3 is subjected to drying and processing, the form of drying is hot-air seasoning, the temperature of drying
It is 95~105 DEG C；
Step 5：By the slab handled through step 4 wind to get；
Wherein, the conveying speed of slab is 110~150m/min；
The slab includes the carbon of 0.035~0.050wt%, the silicon of 0.005~0.010wt%, 0.20~0.28wt%
Manganese, the phosphorus of 0.010~0.018wt%, the sulphur of 0.005~0.015wt%, 0.02~0.04wt% aluminium, and the slab
Surrender be 195~205MPa, tension is 310~325MPa and elongation δ 50 is 40~45%.
Using above-mentioned technical proposal, slab is travelled forward by 110~150m/min so that the processing of each step has
One suitable processing time；And slab is first handled through multiple bending straightening, can improve the pattern of slab, while can also make plate face
The fully broken phosphorus of oxide layer, to make slab that can fully be reacted with hydrochloric acid to improve pickling effect in acid cleaning process；Exist relatively
The case where pickling in the acid solution of high concentration, slab can reduce overpickling in acid cleaning process by rational multistage pickling, and layer
The excessive possibility of iron content, reduction iron content excessively cause the progressive acid cleaning process reduction of layer in pickle after same section pickling
Deficient pickling the case where, further increase pickling effect；Then by countercurrent rinsing at four sections 70~80 DEG C by steel slab surface
Acid solution is cleaned completely, be used in combination 95~105 DEG C air-dry, in time protect pickling after slabs, obtain physical property do not destroy it is serious
Product keeps the original performance of product.
Further preferably：Six sections of acid cleaning process include the paragraph 1 pickling set gradually along slab conveying direction, the 2nd section
Pickling, the 3rd section of pickling, the 4th section of pickling, the 5th section of pickling and the 6th section of pickling；Wherein, iron contains in the pickling solution of paragraph 1 pickling
The highest of amount is limited to 250g/l, and the highest of iron content is limited to 200g/l, the acid of the 3rd section of pickling in the pickling solution of the 2nd section of pickling
The highest of iron content is limited to 150g/l in dilution, and the highest of iron content is limited to 100g/l in the pickling solution of the 4th section of pickling, and
The highest limit of iron content is 80g/l in the pickling solution of 5 sections of pickling and the 6th section of pickling.
Using above-mentioned technical proposal, pickling effect can be further increased to the obstruction of pickling by reducing iron content in pickling solution
Fruit improves the brightness of the slab after pickling.
Further preferably：Four sections are washed in the water used, and the highest of conductivity is limited to 350 μ s/cm and the Cl in it-
The highest of content is limited to 35mg/l.
Using above-mentioned technical proposal, reduce conductivity and Cl excessively high in rinsing solution-Content, can be into the obstruction of washing
One step improves the effect of cleaning slab surface acid liquid.
Further preferably：Total washing time of four sections of washings is 3~10s, and its water velocity is 10~40m3/hr。
Using above-mentioned technical proposal, while fully washing away acid solution, energy consumption is reduced.
Further preferably：The time of drying is 0.5~5s.
It reduces while slab is protected in drying using above-mentioned technical proposal and dries the long shadow to slab physical property
It rings.
Further preferably：Pickling operation carries out in descaling bath, and water washing operations carry out in rinsing bowl；Different descaling baths
Between, be equipped between the 6th section of descaling bath and the rinsing bowl of paragraph 1, between different rinsing bowls it is molten on slab for squeezing
The extruding roller mechanism of liquid, the extruding roller mechanism include upper compression roller disposed in parallel and lower compression roller, the upper compression roller and
Gap between lower compression roller is the thickness of slab.
It, will be through the acid solution on the slab on different pickling sections or washing section by squeezing roller mechanism using above-mentioned technical proposal
Or aqueous removes, and reduces its influence to subsequent technique.
Further preferably：Acid pickle through six sections of pickling processes carries out recycling as follows：
Step a：Waste acid recovery liquid, the impurity being filtered to remove in waste liquid；
Step b：The acid pickle handled through step a is subjected to pre-concentration processing；
Step c：The acid pickle handled through step b is added in roaster, is warming up to 180~200 DEG C so that in roaster
Acid mist is formed, vapor and oxygen is passed through in the inner, the fluid containing HCl and the liquid containing iron oxide is obtained after the reaction was complete
Body, isolate iron powder and by containing HCl fluid carry out condensing recovery to get.
Using above-mentioned technical proposal, the HCl in waste acid recovery liquid reduces atmosphere pollution and simultaneously makes full use of the energy.
In conclusion the invention has the advantages that：
1, slab overpickling (surface darkly, the colors such as Huang) or the feelings of deficient pickling (iron scale does not completely remove) are reduced
Condition, steel slab surface gloss and white or brilliant white, surface quality obtain larger raising；
2, the physical properties such as surrender, tension, elongation variation before and after the processing is small, enhances product performance；
3, to every stringent control in production process, keep its collimation good, there is large-scale production application value；
4, the HCl in acid pickle is recycled in processing procedure, reduces atmosphere pollution and makes full use of the energy.
Specific implementation mode
This specific embodiment is only explanation of the invention, is not limitation of the present invention, people in the art
Member can as needed make the present embodiment the modification of not creative contribution after reading this specification, but as long as at this
It is all protected by Patent Law in the protection domain of invention.
Highest limit of the present invention, which is referred to, to be needed replacing when reaching the parameter in the system to use new body
System.
Embodiment 1：A kind of hot rolling acid-cleaning plate, is prepared by the following method：
Step 1：It is the slab (each property of slab raw material is as shown in table 1) of 110~150m/min to take conveying speed, through nine
Roller straightener straightening processing makes the multiple bending straightening of slab；
Step 2：By the slab handled through step 1 carry out successively paragraph 1 pickling, the 2nd section of pickling, the 3rd section of pickling, the 4th section
Pickling, the 5th section of pickling and the 6th section of pickling, the form of pickling is turbulence acid dip and total pickling time is 10~20min；Every section of acid
The pickling solution temperature washed is a concentration of 190~210g/l of initial HCl of 70~80 DEG C and pickling solution；And paragraph 1 pickling
Pickling solution in the highest of iron content be limited to 250g/l, the highest of iron content is limited to 200g/ in the pickling solution of the 2nd section of pickling
L, the highest of iron content is limited to 150g/l in the pickling solution of the 3rd section of pickling, and iron content is most in the pickling solution of the 4th section of pickling
Height is limited to 100g/l, and the highest limit of iron content is 80g/l in the pickling solution of the 5th section of pickling and the 6th section of pickling；
Acid pickle through six sections of pickling processes carries out recycling as follows：Step a：Waste acid recovery liquid, filtering
Remove the impurity in waste liquid；Step b：The acid pickle handled through step a is subjected to pre-concentration processing；Step c：At will be through step b
The acid pickle of reason adds in roaster, is warming up to 180~200 DEG C and forms acid mist so that roaster is interior, is passed through vapor in the inner
And oxygen, the fluid containing HCl and the liquid containing iron oxide are obtained after the reaction was complete, isolate iron powder and will be containing HCl's
Fluid carry out condensing recovery to get；
Step 3：The slab handled through step 2 is subjected to four sections of washings, the form of washing is countercurrent rinsing, every section of washing
Water temperature is 70~80 DEG C；Four sections are washed in the water used, and the highest of conductivity is limited to 350 μ s/cm and the Cl in it-Content
Highest is limited to 35mg/l；Total washing time of four sections of washings is 3~10s, and its water velocity is 10~40m3/hr；
Step 4：The slab handled through step 3 is subjected to drying and processing, the form of drying is hot-air seasoning, the temperature of drying
It it is 95~105 DEG C, the time of drying is 0.5~5s；
Step 5：By the slab handled through step 4 wind to get；
Pickling operation carries out in descaling bath, and water washing operations carry out in rinsing bowl；Between different descaling baths, final stage
Descaling bath and the rinsing bowl of paragraph 1 between, compression roller for squeezing the solution on slab is equipped between different rinsing bowl
Mechanism, it includes upper compression roller disposed in parallel and lower compression roller, the gap between upper compression roller and lower compression roller to squeeze roller mechanism
For the thickness of slab.
The information of the slab raw material of 1 embodiment 1 of table
Embodiment 2：A kind of hot rolling acid-cleaning plate, difference from example 1 is that, each property such as table 2 of slab raw material
It is shown.
The information of the slab raw material of 2 embodiment 2 of table
Embodiment 3：A kind of hot rolling acid-cleaning plate, difference from example 1 is that, each property such as table 3 of slab raw material
It is shown.
The information of the slab raw material of 3 embodiment 3 of table
Embodiment 4：A kind of hot rolling acid-cleaning plate, difference from example 1 is that, each property such as table 4 of slab raw material
It is shown.
The information of the slab raw material of 4 embodiment 4 of table
Embodiment 5：A kind of hot rolling acid-cleaning plate, difference from example 1 is that, paragraph 1 pickling, the 2nd section of pickling,
The highest limit of iron content is 250g/l in the pickling solution of 3 sections of pickling, the 4th section of pickling, the 5th section of pickling and the 6th section of pickling.
Embodiment 6：A kind of hot rolling acid-cleaning plate, difference from example 1 is that, four sections are washed in the water used,
The highest of conductivity is limited to 500 μ s/cm.
Embodiment 7：A kind of hot rolling acid-cleaning plate, difference from example 1 is that, four sections are washed in the water used,
Interior Cl-The highest of content is limited to 60mg/l.
Embodiment 8：A kind of hot rolling acid-cleaning plate, difference from example 1 is that, total washing time of four sections of washings is
1s, and its water velocity is 5m3/hr。
Embodiment 9：A kind of hot rolling acid-cleaning plate, difference from example 1 is that, the time of drying is 10s.
Embodiment 10：A kind of hot rolling acid-cleaning plate, difference from example 1 is that, not between different descaling baths,
Any position setting between 6 sections of descaling bath and the rinsing bowl of paragraph 1, between different rinsing bowls squeezes roller mechanism.
Performance characterization
1, test specimen：A kind of hot rolling acid-cleaning plate of embodiment 1-10.
2, surface quality characterizes：Observe and record the surface color of test specimen；Testing result is as shown in table 5.
3, quantitative measurement：Surrender Y.S, tension T.S are carried out to the slab raw material and final products of test specimen and stretched
The test of long rate δ 50；Testing result is as shown in table 5.
5 performance characterization data of table counts
4, parallel test：With the preparation process repetitive operation 100 times of embodiment 1-10, table is then carried out to each sample
Face quality characterization and quantitative measurement experiment, obtain test result similar with table 5.
Claims (4)
1. a kind of hot rolling acid-cleaning plate, which is characterized in that it is prepared by the following method：
Step 1：The slab in transmission process is taken, through nine roller straightener straightening processings, makes the multiple bending straightening of slab；
Step 2：The slab handled through step 1 is subjected to six sections of pickling, the form of pickling is turbulence acid dip and total pickling time is
10~20min；The pickling solution temperature of every section of pickling is a concentration of 190~210g/ of initial HCl of 70 ~ 80 DEG C and pickling solution
L；
Step 3：The slab handled through step 2 is subjected to four sections of washings, the form of washing is countercurrent rinsing, the water temperature of every section of washing
It is 70 ~ 80 DEG C；
Step 4：The slab handled through step 3 is subjected to drying and processing, the form of drying is hot-air seasoning, and the temperature of drying is 95
~105℃；
Step 5：By the slab handled through step 4 wind to get；
Wherein, the conveying speed of slab is 110 ~ 150m/min；
The slab include the carbon of 0.035 ~ 0.050wt%, the silicon of 0.005 ~ 0.010wt%, the manganese of 0.20 ~ 0.28wt%, 0.010 ~
The aluminium of the phosphorus of 0.018wt%, the sulphur of 0.005 ~ 0.015wt%, 0.02 ~ 0.04wt%, and the yield strength of the slab be 195 ~
205MPa, tensile strength are 310 ~ 325MPa and elongation δ 50 is 40 ~ 45%；
Six sections of acid cleaning process include the paragraph 1 pickling, the 2nd section of pickling, the 3rd section of pickling, the 4th set gradually along slab conveying direction
Section pickling, the 5th section of pickling and the 6th section of pickling；Wherein, the highest of iron content is limited to 250 g/ in the pickling solution of paragraph 1 pickling
L, the highest of iron content is limited to 200g/L in the pickling solution of the 2nd section of pickling, and iron content is most in the pickling solution of the 3rd section of pickling
Height is limited to 150g/L, and the highest of iron content is limited to 100g/L, the 5th section of pickling and the 6th section of pickling in the pickling solution of the 4th section of pickling
Pickling solution in iron content highest limit be 80g/L；
Pickling operation carries out in descaling bath, and water washing operations carry out in rinsing bowl；Between different descaling baths, the 6th section of pickling
The extruding roller mechanism for squeezing the solution on slab, institute are equipped between slot and the rinsing bowl of paragraph 1, between different rinsing bowls
It includes upper compression roller disposed in parallel and lower compression roller, the gap between the upper compression roller and lower compression roller to state and squeeze roller mechanism
For the thickness of slab；
Acid pickle through six sections of pickling processes carries out recycling as follows：
Step a：Waste acid recovery liquid, the impurity being filtered to remove in acid pickle；
Step b：The acid pickle handled through step a is subjected to pre-concentration processing；
Step c：The acid pickle handled through step b is added in roaster, is warming up to 180 ~ 200 DEG C so that forming acid in roaster
Mist is passed through vapor and oxygen in the inner, and the fluid containing HCl and the liquid containing iron oxide are obtained after the reaction was complete, separation
Go out iron powder and by containing HCl fluid carry out condensing recovery to get.
2. hot rolling acid-cleaning plate according to claim 1, which is characterized in that four sections are washed in the water used, conductivity
Highest is limited to 350 μ s/cm and the Cl in it-The highest of content is limited to 35mg/L.
3. hot rolling acid-cleaning plate according to claim 1, which is characterized in that total washing time of four sections of washings is 3 ~ 10s, and
Its water velocity is 10 ~ 40m3/h。
4. hot rolling acid-cleaning plate according to claim 1, which is characterized in that the time of drying is 0.5 ~ 5s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611086290.1A CN106540993B (en) | 2016-12-01 | 2016-12-01 | Hot rolling acid-cleaning plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611086290.1A CN106540993B (en) | 2016-12-01 | 2016-12-01 | Hot rolling acid-cleaning plate |
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| CN106540993A CN106540993A (en) | 2017-03-29 |
| CN106540993B true CN106540993B (en) | 2018-11-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6462485A (en) * | 1987-08-31 | 1989-03-08 | Sumitomo Metal Ind | Method for pickling hot rolled steel sheet at high speed |
| CN101745544A (en) * | 2010-01-04 | 2010-06-23 | 湖南华菱涟源钢铁有限公司 | Method for controlling transverse thickness difference of medium-low grade electrical steel |
| CN103255429A (en) * | 2013-04-06 | 2013-08-21 | 莱芜市泰山冷轧板有限公司 | Pickling method of hot rolled steel strip |
| CN104480391A (en) * | 2014-11-24 | 2015-04-01 | 江苏省沙钢钢铁研究院有限公司 | Hot-rolled pickled plate and production method thereof |
| CN105925891A (en) * | 2016-07-15 | 2016-09-07 | 武汉钢铁股份有限公司 | Hot-rolled pickled steel with tensile strength of 310MPa grade and used for high-surface quality automobiles, and production method thereof |
-
2016
- 2016-12-01 CN CN201611086290.1A patent/CN106540993B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6462485A (en) * | 1987-08-31 | 1989-03-08 | Sumitomo Metal Ind | Method for pickling hot rolled steel sheet at high speed |
| CN101745544A (en) * | 2010-01-04 | 2010-06-23 | 湖南华菱涟源钢铁有限公司 | Method for controlling transverse thickness difference of medium-low grade electrical steel |
| CN103255429A (en) * | 2013-04-06 | 2013-08-21 | 莱芜市泰山冷轧板有限公司 | Pickling method of hot rolled steel strip |
| CN104480391A (en) * | 2014-11-24 | 2015-04-01 | 江苏省沙钢钢铁研究院有限公司 | Hot-rolled pickled plate and production method thereof |
| CN105925891A (en) * | 2016-07-15 | 2016-09-07 | 武汉钢铁股份有限公司 | Hot-rolled pickled steel with tensile strength of 310MPa grade and used for high-surface quality automobiles, and production method thereof |
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