CN106148973A - A kind of acid washing method of hot rolling ordinary stainless steel plate - Google Patents
A kind of acid washing method of hot rolling ordinary stainless steel plate Download PDFInfo
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- CN106148973A CN106148973A CN201510192124.9A CN201510192124A CN106148973A CN 106148973 A CN106148973 A CN 106148973A CN 201510192124 A CN201510192124 A CN 201510192124A CN 106148973 A CN106148973 A CN 106148973A
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Abstract
The present invention provides the acid washing method of a kind of hot rolling ordinary stainless steel plate, uses double nitration mixture pickling, all uses HNO in final pickling section3+ HF mixed solution carries out pickling；Final pickling section is divided into final pickling 1 section and final pickling 2 sections.At final pickling 1 section, pickle: HNO3, 140～280g/l；HF, 20～70g/l；Metal ion content in acid: 5～45g/l；At final pickling 2 sections, pickle: HNO3, 200～320g/l；HF, 15～60g/l；Metal ion content in acid: 5～40g/l；Steel plate is 3.8～8.8 minutes through the time of final acid cleaning process section.The acid washing method that the present invention provides is on ball blast spray pickling production line, and this acid washing method can significantly reduce multiple acid rate, it also avoid after pickling on steel plate, can remain Cl, SO4Conjugate or Cl, SO4The problems such as ion.
Description
Technical field
The invention belongs to acid-washing stainless steel technical field, relate to the acid washing method of a kind of hot rolling ordinary stainless steel plate.
Background technology
Acid-washing stainless steel is exactly to use acid solution that with the rustless steel of oxide skin, surface is carried out surface acid chemical treatment, removes not
The rust oxide layer that formed in the high-temperature hot course of processing of steel surface and chromium depleted layer, and synchronize passivation, form non-oxidation layer and remain, with
And silvery white or silver-gray apparent condition.
In stainless steel product, with 304,316L and S32168 etc. 300 be that stainless pickling is the most representative.300
It is that rustless steel is single phase austenite rustless steel, contains the alloying elements such as more Cr, Ni, Mo, Ti due to it so that its
The Nomenclature Composition and Structure of Complexes of the oxide skin formed in hot procedure is significantly different with carbon steel, in addition to the oxide of common Fe,
Possibly together with FeCr2O4The metal-oxide of the element such as spinelle and Cr, Ti, Cu, Nb, also includes the nonmetal oxygen such as C, Si
Compound, these oxides are not easy pickling, thus typically use multistep pickling or the technique of electrolysis+nitration mixture pickling.
The technical process of typical common stainless steel pickling is: ball blast → pre-water flushing → pickling → final water cleaning → wind
Curtain purging, drying.
Wherein, acid cleaning process section includes again the process such as pre-pickling, water flushing, final pickling and passivation.Pre-pickling and final acid
Wash and determine pickled surface quality and pickling time, and wherein most critical be exactly pre-Acidwash solution and the composition of final Acidwash solution
And formula.
At present, the common stainless steel acid cleaning process that domestic and international esbablished corporation uses mainly has three kinds, corresponding technical process and acid
Liquid composition is as shown in table 1.
Table 1 typical case's common stainless steel acid cleaning process forms with acid solution
Technique 1 all uses HCl+HF solution in pre-pickling and final pickling stages, does not produce NO in this technique acid cleaning processx,
Decrease pollution, but containing HCl in pickle, after pickling, steel plate can remain conjugate or the Cl ion etc. of Cl.It addition,
Putting hydrogen in acid cleaning process the most more, hydrogen enters in steel may cause deterioration in material properties.
Technique 2 uses HNO3+ HF carries out pre-pickling, uses HNO the most after pickling3It is passivated.The spy of this technique
Point is pickling and deactivation function separately to be carried out, and the product line of single for the common stainless steel trade mark (less), advantage is many.But it is right
For multi items common stainless steel, it is desirable to the similar trade mark or close to the same steel plate of acidproof degree, use same roller table speed；
The inhomogeneity trade mark or acidproof degree, at a distance of bigger steel plate, are used different roller table speed, or are carried by the way widening plate spacing
High pickling quality, corresponding pickling operating rate is low.It addition, on vertical shot-blasting spray pickling production line, use this technique, equipment
Structure is complicated, and construction costs is high.
Technique 3 uses H2SO4Carry out pre-pickling, then use HNO3+ HF carries out final pickling.Use H2SO4Pre-pickling
NO can also be reducedxGeneration, reduce gaseous contamination, but containing H in pickle2SO4, after pickling, steel plate can remain SO4
Conjugate or SO4Ion etc..Use this technique pickling, on horizontal ball blast spray pickling production line, steel plate color after pickling
Substantially, qualification rate is low for difference, and multiple acid rate is higher than 16%.
Summary of the invention
In order to solve the problems referred to above, it is an object of the invention to provide the acid washing method of a kind of hot rolling ordinary stainless steel plate, hot-rolled steel
Plate common stainless steel that is 304,316L and S32168 etc., on horizontal ball blast spray pickling production line, apply pickling of the present invention
Method can significantly reduce multiple acid rate, also avoids after pickling, on steel plate, to remain Cl, SO4Conjugate or Cl,
SO4The problems such as ion.
Technical scheme is as follows:
The acid washing method of a kind of hot rolling ordinary stainless steel plate, it is characterised in that comprise the steps: that the pre-water of Shot Blasting rinses
The final final water of pickling section of section cleans；
The acid washing method of described final pickling section uses double nitration mixture pickling, and described final pickling section is divided into final pickling 1 section with final
Pickling 2 sections, described final pickling section all uses HNO3+ HF mixed solution carries out pickling；In described final pickling 1 section, acid
Washing liquid: HNO3, 140～280g/l；HF, 20～70g/l；Metal ion content in acid: 5～45g/l；In described final pickling 2
Section, pickle: HNO3, 200～320g/l；HF, 15～60g/l；Metal ion content in acid: 5～40g/l.
Acid washing method according to hot rolling ordinary stainless steel plate of the present invention, it is preferred that described steel plate is through final acid cleaning process
The time of section is 3.8～8.8 minutes.
Acid washing method according to hot rolling ordinary stainless steel plate of the present invention, it is preferred that the pickling liquid temperature of described final pickling section
Degree is 45 ± 5 DEG C.
Acid washing method according to hot rolling ordinary stainless steel plate of the present invention, it is preferred that in the fortune of described pre-water purge zone steel plate
Line speed is 2～4.6m/min.
Acid washing method according to hot rolling ordinary stainless steel plate of the present invention, it is preferred that in the fortune of described final pickling section steel plate
Line speed is maintained at 2～4.6m/min.
According to the acid washing method of hot rolling ordinary stainless steel plate of the present invention, first surface of steel plate is carried out Shot Blasting, then will
Steel plate sends into pre-water purge zone through roller-way, and the speed of service of steel plate is maintained at 2～4.6m/min, and steel plate water enters final after rinsing
Pickling section carries out pickling, and the speed of service of steel plate is maintained at 2～4.6m/min, and it is clear that steel plate carries out final water after going out final pickling section
Washing, then air curtain purging, drying, complete pickling.
Detailed Description Of The Invention:
The acid washing method of a kind of hot rolling ordinary stainless steel plate, uses double nitration mixture pickling, all uses HNO in final pickling section3+HF
Mixed solution carries out pickling；Final pickling section is divided into final pickling 1 section and final pickling 2 sections.In final pickling 1 section, acid
Washing liquid: HNO3, 140～280g/l；HF, 20～70g/l；Metal ion content in acid: 5～45g/l；Final pickling 2 sections,
Pickle: HNO3, 200～320g/l；HF, 15～60g/l；Metal ion content in acid: 5～40g/l；Steel plate is through final acid
The time washing process section is 3.8～8.8 minutes.
Further, the acid washing method of the hot rolling ordinary stainless steel plate of the present invention, first surface of steel plate is carried out Shot Blasting, then
Through roller-way, steel plate is sent into pre-water purge zone, and steel plate water enters pre-pickling section (sky is crossed) after rinsing, the speed of service of steel plate is maintained at
2～4.6m/min, after going out pre-pickling section, steel plate is directly entered water purge zone, and after water outlet purge zone, the final pickling section of steel plate entrance is carried out
Pickling, the speed of service of steel plate is maintained at 2～4.6m/min, and acid liquor temperature controls at 45 ± 5 DEG C, after steel plate goes out final pickling section
Carrying out final water cleaning, then air curtain purging, drying, complete pickling.
Described pre-pickling section " empty cross " means that the hardware of general product line includes roller-way (electrical equipment), and enclosed hood etc.,
Pickle spray, steel plate sky mistake is need not in technique.
The present invention uses double nitration mixture acid cleaning process, all uses HNO in final pickling section3+ HF mixed solution carries out pickling.With
Unlike existing acid cleaning process:
Final pickling 1 section, use low concentration HNO3+ higher concentration HF mix acid liquor proportioning, main purpose is to remove
The residual oxide that major part is broken, will remove major part (about 75%) surface of steel plate metal-oxide and nonmetal oxide.
Comparing with existing acid cleaning process, the amount removing residual oxide than HCl+HF acid cleaning process is many, also than H2SO4Acid cleaning process
Removing residual oxide evenly, this mainly uses HNO3+ HF mixed solution, due to HNO3There is oxidisability, can
To improve the concentration of HF, enhance corrosive power, simultaneously HNO3+ HF mixed solution, can contain common stainless steel
FeCr2O4The metal-oxide of the element such as spinelle and Cr, Ti, Cu, Nb, also includes that the nonmetal oxides such as C, Si enter
Row chemical reaction, and corrosion.Use HCl+HF mixed solution and H2SO4Solution, after pickling on steel plate, can remain Cl,
SO4Conjugate or Cl, SO4The problems such as ion.H2SO4Concentration at about 300g/l, temperature at about 70 DEG C, H2SO4
Easily evaporation, corrosive power reduces, and acid cleaning process is unstable, and after pickling, steel plate aberration is obvious, and qualification rate is low, and multiple acid rate is high.
Final pickling 2 sections, use higher concentration HNO3+ low concentration HF mix acid liquor proportioning, it is therefore an objective to remove residue
Oxide, surface of steel plate very small amount (the most about 25%) metal-oxide and nonmetal oxide, removing will be removed very thin
Chromium depleted layer metal, it is achieved the functions such as surface passivation.Feature is horizontal and vertical two surfaces at steel plate, corrodes and is passivated uniformly
Carry out, and docked continuously.Than simple HNO3The function of corrosion that passivation technology is many, this mainly uses HNO3+HF
Mixed solution, the concentration of appropriate design HF, enhance corrosive power, also utilize HNO3Oxidisability, good passivation effect.
Use HNO3Solution, solution temperature is relatively low, is simple passivation technology, does not has HF, also lacked corrosive power in solution.
Beneficial effects of the present invention:
The acid washing method of a kind of hot rolling ordinary stainless steel plate that the present invention provides, uses double nitration mixture acid cleaning process, to 304,316L
Being that corrosion resistant plate carries out pickling with S32168 etc. 300, on horizontal ball blast spray pickling production line, this acid washing method can be big
The reduction of amplitude multiple acid rate, it also avoid after pickling on steel plate, can remain Cl, SO4Conjugate or Cl, SO4Ion etc.
Problem.The acid washing method of hot rolling ordinary stainless steel plate of the present invention eliminates special Passivation Treatment operation, significantly reduces
Production cost.
Detailed description of the invention
In order to be more fully understood that the present invention, it is further elucidated with present disclosure below in conjunction with embodiment, but present disclosure is not
It is limited only to the following examples.
The pickling of embodiment 1:304 common stainless steel hot rolled steel plate
Steel plate thickness 15mm, width 1900mm, length 6000mm.
After surface of steel plate ball blast, send into pre-water through roller-way and rinse cover (section), be transmitted subsequently into pre-pickling cover (section) (empty
Cross).Then steel plate enters water purge zone, and after water outlet purge zone, steel plate enters the 1 section of pickling of final pickling cover, and acid solution composition is:
HNO3220g/l, HF 45g/l, metal ion content 35g/l in acid, temperature 46 DEG C, after steel plate goes out 1 section of final pickling cover,
Entering the 2 sections of pickling of final pickling cover, acid solution composition is: HNO3280g/l, HF 20g/l, metal ion content 28g/l in acid,
Temperature 41 DEG C.Carry out final water cleaning, air curtain purging after final pickling, dry.Steel plate with the speed of 3.8m/min at roller-way
On be continuously advanced, every piece of online pickling time of plate is 4.6min, and surface of steel plate oxide skin is the most clean.
The pickling of embodiment 2:316L common stainless steel hot rolled steel plate
Steel plate thickness 28mm, width 2260mm, length 8000mm.
After surface of steel plate ball blast, send into pre-water through roller-way and rinse cover (section), be transmitted subsequently into pre-pickling cover (section) (empty
Cross).Then steel plate enters water purge zone, and after water outlet purge zone, steel plate enters the 1 section of pickling of final pickling cover, and acid solution composition is:
HNO3260g/l, HF 55g/l, metal ion content 29g/l in acid, temperature 49 DEG C, after steel plate goes out 1 section of final pickling cover,
Entering the 2 sections of pickling of final pickling cover, acid solution composition is: HNO3310g/l, HF 22g/l, metal ion content 35g/l in acid,
Temperature 45 C.Carry out final water cleaning, air curtain purging after final pickling, dry.Steel plate with the speed of 2.8m/min at roller-way
On be continuously advanced, every piece of online pickling time of plate is 6.25min, and surface of steel plate oxide skin is the most clean.
The pickling of embodiment 3:S32168 common stainless steel hot rolled steel plate
Steel plate thickness 30mm, width 2000mm, length 6800mm.
After surface of steel plate ball blast, send into pre-water through roller-way and rinse cover (section), be transmitted subsequently into pre-pickling cover (section) (empty
Cross).Then steel plate enters water purge zone, and after water outlet purge zone, steel plate enters the 1 section of pickling of final pickling cover, and acid solution composition is:
HNO3220g/l, HF 60g/l, metal ion content 22g/l in acid, temperature 45 C, after steel plate goes out 1 section of final pickling cover,
Entering the 2 sections of pickling of final pickling cover, acid solution composition is: HNO3260g/l, HF 19g/l, metal ion content 28g/l in acid,
Temperature 40 DEG C.Carry out final water cleaning, air curtain purging after final pickling, dry.Steel plate with the speed of 2.6m/min at roller-way
On be continuously advanced, every piece of online pickling time of plate is 6.73min, and surface of steel plate oxide skin is the most clean.
The pickle of the acid cleaning process of the present invention, does not use HCl and H2SO4Deng acid, naturally avoid after pickling on steel plate,
Cl, SO can be remained4Conjugate or Cl, SO4The problems such as ion.
Technique before this department uses sulphuric acid+nitration mixture (HNO3+ HF) Technology, after nitration mixture uses a period of time, nitration mixture
Can become waste mixed acid liquid, waste mixed acid liquid can be with regeneration, wherein waste mixed acid (HNO3+ HF) liquid sends benchmark requirement SO outside4 2-,
H2SO4Concentration is not higher than 0.5g/L.Reality was measured at about 15g/L.
The acid washing method of a kind of hot rolling ordinary stainless steel plate that the present invention provides, uses double nitration mixture acid cleaning process, to 304,
316L and S32168 etc. 300 are that corrosion resistant plate carries out pickling, and on horizontal ball blast spray pickling production line, this acid washing method can
Significantly to reduce multiple acid rate, it also avoid after pickling on steel plate, Cl, SO can be remained4Conjugate or Cl, SO4
The problems such as ion.And eliminate special Passivation Treatment operation, significantly reduce production cost.
Claims (6)
1. the acid washing method of a hot rolling ordinary stainless steel plate, it is characterised in that comprise the steps: the pre-water of Shot Blasting
The final water of purge zone final pickling section cleans；
The acid washing method of described final pickling section uses double nitration mixture pickling, and described final pickling section is divided into final pickling 1 section with final
Pickling 2 sections, described final pickling section all uses HNO3+ HF mixed solution carries out pickling；In described final pickling 1 section, acid
Washing liquid: HNO3, 140～280g/l；HF, 20～70g/l；Metal ion content in acid: 5～45g/l；In described final pickling 2
Section, pickle: HNO3, 200～320g/l；HF, 15～60g/l；Metal ion content in acid: 5～40g/l.
The acid washing method of hot rolling ordinary stainless steel plate the most according to claim 1, it is characterised in that described steel plate is through
The time of whole acid cleaning process section is 3.8～8.8 minutes.
The acid washing method of hot rolling ordinary stainless steel plate the most according to claim 1, it is characterised in that described final pickling section
Pickle temperature be 45 ± 5 DEG C.
The acid washing method of hot rolling ordinary stainless steel plate the most according to claim 1, it is characterised in that rinse at described pre-water
The speed of service of section steel plate is 2～4.6m/min.
The acid washing method of hot rolling ordinary stainless steel plate the most according to claim 1, it is characterised in that in described final pickling
The speed of service of section steel plate is maintained at 2～4.6m/min.
The acid washing method of hot rolling ordinary stainless steel plate the most according to claim 1, it is characterised in that first by surface of steel plate
Carrying out Shot Blasting, then through roller-way, steel plate is sent into pre-water purge zone, the speed of service of steel plate is maintained at 2～4.6m/min,
Steel plate water enters final pickling section after rinsing and carries out pickling, and the speed of service of steel plate is maintained at 2～4.6m/min, and steel plate goes out finally
Carrying out final water cleaning after pickling section, then air curtain purging, drying, complete pickling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510192124.9A CN106148973A (en) | 2015-04-21 | 2015-04-21 | A kind of acid washing method of hot rolling ordinary stainless steel plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510192124.9A CN106148973A (en) | 2015-04-21 | 2015-04-21 | A kind of acid washing method of hot rolling ordinary stainless steel plate |
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| CN106148973A true CN106148973A (en) | 2016-11-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114214631A (en) * | 2021-12-20 | 2022-03-22 | 太原科技大学 | Acid pickling process of austenitic iron-nickel-based alloy welded pipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1178262A (en) * | 1996-05-24 | 1998-04-08 | 阿姆科公司 | Hydrogen peroxide pickling of stainless steel |
| KR101228737B1 (en) * | 2010-12-27 | 2013-02-04 | 주식회사 포스코 | Method for Pickling Hot Rolled Steel Sheet Having Advanced High Strength |
| CN103447321A (en) * | 2012-05-31 | 2013-12-18 | 宝钢特种材料有限公司 | Plate with-temperature mixed-acid pickling process used for stainless steel plate |
-
2015
- 2015-04-21 CN CN201510192124.9A patent/CN106148973A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1178262A (en) * | 1996-05-24 | 1998-04-08 | 阿姆科公司 | Hydrogen peroxide pickling of stainless steel |
| KR101228737B1 (en) * | 2010-12-27 | 2013-02-04 | 주식회사 포스코 | Method for Pickling Hot Rolled Steel Sheet Having Advanced High Strength |
| CN103447321A (en) * | 2012-05-31 | 2013-12-18 | 宝钢特种材料有限公司 | Plate with-temperature mixed-acid pickling process used for stainless steel plate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114214631A (en) * | 2021-12-20 | 2022-03-22 | 太原科技大学 | Acid pickling process of austenitic iron-nickel-based alloy welded pipe |
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