CN106757072A - Plate surface treatment method in two phase stainless steel - Google Patents
Plate surface treatment method in two phase stainless steel Download PDFInfo
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- CN106757072A CN106757072A CN201611108497.4A CN201611108497A CN106757072A CN 106757072 A CN106757072 A CN 106757072A CN 201611108497 A CN201611108497 A CN 201611108497A CN 106757072 A CN106757072 A CN 106757072A
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- Prior art keywords
- acid
- washing
- continuous
- stainless steel
- phase stainless
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Classifications
-
- 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
- C23G1/086—Iron or steel solutions containing HF
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
Plate surface treatment method in two phase stainless steel is disclosed, it includes：A) Shot Blasting is carried out to plate surface in the two phase stainless steel；And continuous acid-washing b) is carried out to plate surface in the two phase stainless steel by Shot Blasting；Wherein described continuous acid-washing includes the first continuous acid-washing and the second continuous acid-washing, first continuous acid-washing uses single acid, second continuous acid-washing uses nitric acid and the nitration mixture of hydrofluoric acid, the concentration of wherein described nitric acid is 30g/L 80g/L, the concentration of the hydrofluoric acid is 60g/L 85g/L, based on mass percent, the two phase stainless steel contains C≤0.030%, Si≤1.00%, Mn≤2.00%, P≤0.030%, S≤0.020%, Cr21.00% 23.00%, Ni 4.50% 6.50%, Mo 2.50% 3.50%, N 0.14% 0.20%, balance of iron and other inevitable impurity.High-efficiency and continuous pickling is realized using the present processes, surface color is consistent, meets great surface quality requirement of the high-end field to steel plate.
Description
Technical field
The application relates generally to stainless steel field, more specifically, the application is related to stainless steel surfaces process field.
Background technology
Two phase stainless steel due to Cr, Mo and N content higher, while austenite and ratio of ferrite in room temperature texture
According to about 1:1 coexists, therefore with high intensity (its yield strength is generally the twice of austenitic stainless steel), good resistance to Cl-
The outstanding advantages such as spot corrosion, anticorrosion stress-resistant and welding performance, are made extensively in fields such as petrochemical industry, salt manufacturing, water conservancy project, shipbuildings
With.Compared with common austenitic stainless steel and super austenitic stainless steel, the content of Ni is substantially reduced in steel, manufacturing cost drop
It is low, category high-performance, resource-conserving steel grade.Cr, Mo high and the composition characteristics of N high that two phase stainless steel has, in heating process
The scale oxide Rotating fields of formation are complicated, fine and close, and the adhesive force with matrix is strong, compared to common 316L austenitic stainless steels, its acid
Wash extremely difficult.
General introduction
The application relates in one aspect to plate surface treatment method in two phase stainless steel, and it includes：A) to the two phase stainless steel
Middle plate surface carries out Shot Blasting；And continuous acid-washing b) is carried out to plate surface in the two phase stainless steel by Shot Blasting；Its
Described in continuous acid-washing include the first continuous acid-washing and the second continuous acid-washing, first continuous acid-washing use single acid, it is described
Second continuous acid-washing is using nitric acid and the nitration mixture of hydrofluoric acid, wherein the concentration of the nitric acid is 30g/L-80g/L, the hydrofluoric acid
Concentration be 60g/L-85g/L, based on mass percent, the two phase stainless steel contains C≤0.030%, Si≤1.00%, Mn
≤ 2.00%, P≤0.030%, S≤0.020%, Cr 21.00%-23.00%, Ni 4.50%-6.50%, Mo 2.50%-
3.50%, N 0.14%-0.20%, balance of iron and other inevitable impurity.
Describe in detail
In the following description, including some concrete details are providing each disclosed embodiment comprehensively reason
Solution.However, those skilled in the relevant art are not, it will be recognized that use one or more of these concrete details, and use other
Embodiment is still realized in the case of method, part, material etc..
Unless required otherwise in the application, in entire disclosure and appending claims, word " including ", " bag
Containing ", " containing " and " having " should be interpreted that meaning that is open, including formula, i.e., " including but not limited to ".
" embodiment ", " embodiment ", " in another embodiment " mentioned throughout the specification or " at certain
In a little embodiments " mean an at least embodiment include it is related to described in the embodiment with specific reference to key element,
Structure or feature.Therefore, throughout the specification diverse location occur phrase " in one embodiment " or " in embodiment
In " or " in another embodiment " or " in certain embodiments " same embodiment need not be all referred to.Additionally, specifically
Element, structure or feature can be combined in one or more embodiments in any suitable manner.
Definition
Herein, " two phase stainless steel " means that ferrite respectively accounts for 50% with austenite, and the content of general less phase is most
It is also required to reach 30% stainless steel less.
Herein, " ferrite " means interstitial solid solution of the carbon dissolution in α-Fe, and it has body-centered cubic lattic, often
Represented with symbol F.Pure ferritic structure has good plasticity and toughness, but intensity and hardness are all relatively low.
Herein, " austenite " means the nonmagnetic solid solution of a small amount of carbon of solid solution in γ-Fe, and it has face-centered cubic knot
Structure.Preferably, intensity is relatively low, with certain toughness, without ferromagnetism for austenite plasticity.
Herein, " middle plate " means the steel plate of thickness 5.0-25.0mm.
Herein, " Shot Blasting " mean using high speed rotation impeller small shot or small shot are thrown out height
Speed shock piece surface, therefore the oxide layer of piece surface can be removed, while shot or shot high-speed impact piece surface, cause
The lattice distortion deformation of piece surface, increases case hardness, is a kind of method cleared up piece surface.
Specific embodiment
The application relates in one aspect to plate surface treatment method in two phase stainless steel, and it includes：
A) Shot Blasting is carried out to plate surface in the two phase stainless steel；And
B) continuous acid-washing is carried out to plate surface in the two phase stainless steel by Shot Blasting；
Wherein described continuous acid-washing includes the first continuous acid-washing and the second continuous acid-washing, and first continuous acid-washing uses single
One acid, second continuous acid-washing is using nitric acid and the nitration mixture of hydrofluoric acid, wherein the concentration of the nitric acid is 30g/L-80g/L,
The concentration of the hydrofluoric acid is 60g/L-85g/L, and based on mass percent, the two phase stainless steel contains C≤0.030%, Si
≤ 1.00%, Mn≤2.00%, P≤0.030%, S≤0.020%, Cr 21.00%-23.00%, Ni 4.50%-
6.50%, Mo 2.50%-3.50%, N 0.14%-0.20%, balance of iron and other inevitable impurity.
In certain embodiments, a Shot Blasting is carried out to plate surface in two phase stainless steel.In some embodiments
In, once above Shot Blasting is carried out to plate surface in two phase stainless steel.In certain embodiments, to plate in two phase stainless steel
Surface carries out Shot Blasting twice.
In certain embodiments, can be used in the pellet diameters about 0.3mm- of the Shot Blasting in the present processes
0.6mm。
In certain embodiments, can be used in the sour illustrative examples bag of the first continuous acid-washing in the present processes
Include but be not limited to sulfuric acid.
In certain embodiments, the concentration that can be used in the sulfuric acid of the first continuous acid-washing in the present processes is about
280g/L-320g/L。
In certain embodiments, can be used in the sulfuric acid concentration of the first continuous acid-washing in the present processes only one
Pickling speed is just improved as concentration increases when within the scope of fixed, and after exceeding this scope, pickling speed can be reduced on the contrary,
Therefore, it is for about 280g/L-320g/L by the concentration setting of the sulfuric acid of the first continuous acid-washing in the present processes.
In certain embodiments, can be used in the mass fraction of the sulfuric acid of the first continuous acid-washing in the present processes
About 24%-27%.
In certain embodiments, can be used in the mass fraction of the sulfuric acid of the first continuous acid-washing in the present processes
About 25%.
In certain embodiments, can be used in the first continuous acid-washing in the present processes and use heavy caliber acid mouth.
In certain embodiments, the heavy caliber acid mouth that can be used in the first continuous acid-washing in the present processes shows
Example property example includes but is not limited to oval heavy caliber acid mouth.
In certain embodiments, can be used in the oval heavy caliber acid of the first continuous acid-washing in the present processes
The major diameter of mouth is about 8mm, and minor axis diameter is about 6mm.In certain embodiments, the length of oval heavy caliber acid mouth is increased
Shaft diameter purpose is increase sector.
In certain embodiments, the heavy caliber acid mouth that can be used in the first continuous acid-washing in the present processes makes acid
Liquid injection produces sector.
In certain embodiments, can be used in the first continuous acid-washing in the present processes temperature be about 60 DEG C-
70℃。
In certain embodiments, can be used in the first continuous acid-washing in the present processes temperature be about 65 DEG C-
70℃。
In certain embodiments, the illustrative examples that can be used in the first continuous acid-washing in the present processes include
But it is not limited to upper and lower fountain continuous acid-washing and immersion continuous acid-washing.
In certain embodiments, can be used in the first continuous acid-washing in the present processes is circulation continuous acid-washing.
In certain embodiments, the pickling speed that can be used in the first continuous acid-washing in the present processes is about
1m/min-1.3m/min。
In certain embodiments, can be used in the exemplary reality of the nitration mixture of the second continuous acid-washing in the present processes
Example includes but is not limited to nitric acid and hydrofluoric acid, nitric acid and hydrochloric acid and hydrochloric acid and hydrogen peroxide.
In certain embodiments, the concentration that can be used in the nitric acid of the second continuous acid-washing in the present processes is about
30g/L-80g/L。
In certain embodiments, can be used in the concentration of hydrofluoric acid of the second continuous acid-washing in the present processes about
It is 60g/L-85g/L.
In certain embodiments, can be used in the second continuous acid-washing in the present processes and use heavy caliber acid mouth.
In certain embodiments, the heavy caliber acid mouth that can be used in the second continuous acid-washing in the present processes shows
Example property example includes but is not limited to oval heavy caliber acid mouth.
In certain embodiments, can be used in the oval heavy caliber acid of the second continuous acid-washing in the present processes
The major diameter of mouth is about 8mm, and minor axis diameter is about 6mm.In certain embodiments, the length of oval heavy caliber acid mouth is increased
Shaft diameter purpose is increase sector.
In certain embodiments, the heavy caliber acid mouth that can be used in the second continuous acid-washing in the present processes makes acid
Liquid injection produces sector.
In certain embodiments, can be used in the second continuous acid-washing in the present processes temperature be about 48 DEG C-
53℃。
In certain embodiments, can be used in the second continuous acid-washing in the present processes temperature be about 48 DEG C-
50℃。
In certain embodiments, can be used in the second continuous acid-washing in the present processes temperature be about 50 DEG C-
53℃。
In certain embodiments, the second continuous acid-washing that can be used in the present processes is connected using upper and lower fountain
Continuous pickling.
In certain embodiments, can be used in the second continuous acid-washing in the present processes is circulation continuous acid-washing.
In certain embodiments, the pickling speed that can be used in the second continuous acid-washing in the present processes is about
1m/min-1.3m/min。
In certain embodiments, can be used in the first continuous acid-washing in the present processes and the second continuous acid-washing
Heavy caliber acid mouth injection acid solution generation sector has joint.
In certain embodiments, the first continuous acid-washing and the second continuous acid-washing that can be used in the present processes be
Continuous pickling line.
In certain embodiments, can be used in the present processes also includes the two phase stainless steel processed continuous acid-washing
Middle plate surface carries out continuous washing.
In certain embodiments, in can be used in the two phase stainless steel to continuous acid-washing treatment in the present processes
The washing temperature that plate surface carries out continuous washing is about >=60 DEG C.
In certain embodiments, the two phase stainless steel that can be used in the present processes is contained based on mass percent
C≤0.030%, Si≤1.00%, Mn≤2.00%, P≤0.030%, S≤0.020%, Cr 21.00%-23.00%, Ni
4.50%-6.50%, Mo 2.50%-3.50%, N 0.14%-0.20%, balance of iron and other inevitable impurity.
In the present processes, cause that scale oxide shatter value increases using multiple Shot Blasting, increased machinery and remove
Squama effect, reduces chemical dephosphorization pressure.
In the present processes, the first continuous acid-washing and the second continuous acid-washing make acid solution all using heavy caliber acid mouth
Injection produces sector, it is ensured that sector has joint, improves pickling uniformity, reaches pickling color and luster consistent.
In the present processes, in nitration mixture section, according to nitric acid and the chemical property of hydrofluoric acid, using rational nitric acid and
Hydrofluoric acid concentration is matched, and control acid cleaning process is in the active dissolution stage, dramatically improves two phase stainless steel Surface Oxygen
Change the rate of dissolution of iron scale, pickling speed is improved to 1m/min-1.3m/min by former less than 0.3m/min.
In the present processes, plate surface color and luster is consistent in surface treated two phase stainless steel, meets high-end neck
Great surface quality requirement of the domain to steel plate.
Hereinafter, the application will be explained in detail to more fully understand each side of the application by following examples
Face and its advantage.It will be appreciated, however, that following embodiment is nonrestrictive some realities for being simply used for illustrating the application
Apply scheme.
Embodiment
Embodiment 1
1., using plate in two phase stainless steel, its chemical composition is：
C：0.015%, Si：0.57%, Mn：1.17%, P：0.024%, S：0.001%, Cr：22.45%, Ni：
5.62%, Mo：3.15%, N：0.1645%, balance of iron and other inevitable impurity.
2. plate gauge lattice and quantity are in two phase stainless steel：10*2000*8000mm, 20 pieces
3. plate carries out Shot Blasting twice in the two phase stainless steel after pair heat treatment, and pellet diameters are 0.3-0.6mm, pill
Average diameter is about 0.4mm.
4. continuous acid-washing
4.1 first stage：According to sulfuric acid chemical characteristic, mass fraction is that 25% sulfuric acid activity reaches highest.Initial rank
Section sulfuric acid actual measurement is 298.9g/L, and temperature is 61 DEG C, but with the carrying out of acid cleaning process, sulfuric acid concentration and temperature in change,
By controlling continuous lines sulfuric acid concentration, by the control of continuous acid-washing sulfuric acid concentration in the range of 290g/L-320g/L, sulfuric acid activity
Reach optimal, raising sulfuric acid scale removal effect.Temperature control is at 60 DEG C -70 DEG C.
4.2 second stage：Nitration mixture acid solution is matched, and nitric acid initial concentration is 57.6g/L, and hydrofluoric acid concentration is 83.1g/L, acid
Initial temperature is washed for 48 DEG C, but with the carrying out of acid cleaning process, nitric acid and hydrofluoric acid concentration and temperature are changing, by control
Continuous lines nitric acid and hydrofluoric acid concentration, the concentration of nitric acid is controlled in the range of 55g/L-60g/L, and hydrofluoric acid concentration control exists
In the range of 80g/L-85g/L, pickling temperature is 48 DEG C -50 DEG C.
5. plate continuous water spray is washed in the two phase stainless steel after pair pickling, and washing temperature is 62 DEG C.
Produced by according to above-mentioned technique, plate pickling speed is carried by former less than 0.3m/min in two phase stainless steel
Up to 1.2m/min, surface color is consistent.
Embodiment 2
1., using plate in two phase stainless steel, its chemical composition is：
C：0.018%, Si：0.47%, Mn：1.12%, P：0.023%, S：0.001%, Cr：22.55%, Ni：
5.28%, Mo：3.10%, N：0.1630%, balance of iron and other inevitable impurity.
2. plate gauge lattice and quantity are in two phase stainless steel：20*2000*8000mm, 10 pieces
3. pair in the two phase stainless steel after heat treatment plate by Shot Blasting twice, pellet diameters are 0.3-0.6mm, pill
Average diameter is about 0.4mm.
4. continuous acid-washing
4.1 first stage：According to sulfuric acid chemical characteristic, mass fraction is that 25% sulfuric acid activity reaches highest.Initial rank
Section sulfuric acid actual measurement is 288.4g/L, and temperature is 66 DEG C, but with the carrying out of acid cleaning process, sulfuric acid concentration and temperature in change,
By controlling continuous lines sulfuric acid concentration, by the control of continuous acid-washing sulfuric acid concentration in the range of 280g/L-310g/L, sulfuric acid activity
Reach optimal, raising sulfuric acid scale removal effect.Temperature control is at 65 DEG C -70 DEG C.
4.2 second stage：Nitration mixture acid solution is matched, and nitric acid initial concentration is 46.8g/L, and hydrofluoric acid concentration is 81.5g/L, acid
Initial temperature is washed for 50 DEG C, but with the carrying out of acid cleaning process, nitric acid and hydrofluoric acid concentration and temperature are changing, by control
Continuous lines nitric acid and hydrofluoric acid concentration, the concentration of nitric acid is controlled in the range of 45g/L-50g/L, and hydrofluoric acid concentration control exists
In the range of 80g/L-85g/L, pickling temperature is 50 DEG C -53 DEG C.
5. plate continuous water spray is washed in the two phase stainless steel after pair pickling, and washing temperature is 65 DEG C.
Produced by according to above-mentioned technique, plate pickling speed is carried by former less than 0.3m/min in two phase stainless steel
Up to 1.3m/min, surface color is consistent.
Although from the foregoing it is appreciated that in order to the purpose of exemplary illustration describes specific embodiments of the present invention,
But under condit without departing from the spirit and scope of the present invention, technical staff described in this area can make various modifications or change
Enter.These deformations or modification should all fall into the application scope of the following claims.
Claims (10)
1. plate surface treatment method in two phase stainless steel, it includes：
A) Shot Blasting is carried out to plate surface in the two phase stainless steel；And
B) continuous acid-washing is carried out to plate surface in the two phase stainless steel by Shot Blasting；
Wherein described continuous acid-washing includes the first continuous acid-washing and the second continuous acid-washing, and first continuous acid-washing uses single
Acid, second continuous acid-washing is using nitric acid and the nitration mixture of hydrofluoric acid, wherein the concentration of the nitric acid is 30g/L-80g/L, institute
The concentration of hydrofluoric acid is stated for 60g/L-85g/L, based on mass percent, the two phase stainless steel contains C≤0.030%, Si≤
1.00%, Mn≤2.00%, P≤0.030%, S≤0.020%, Cr 21.00%-23.00%, Ni 4.50%-6.50%,
Mo 2.50%-3.50%, N 0.14%-0.20%, balance of iron and other inevitable impurity.
2. the method for claim 1, wherein the pellet diameters of the Shot Blasting are 0.3mm-0.6mm.
3. method as claimed in claim 1 or 2, wherein the single acid used in first pickling is sulfuric acid, preferred concentration
It is the sulfuric acid of 280g/L-320g/L, more preferably mass fraction is 25% sulfuric acid.
4. the method as described in any claim in claims 1 to 3, wherein the continuous acid-washing connects selected from upper and lower fountain
Continuous pickling and immersion continuous acid-washing.
5. the method as described in any claim in Claims 1-4, wherein the pickling speed is 1m/min-1.3m/
min。
6. the method as described in any claim in claim 1 to 5, wherein the temperature of first continuous acid-washing is 60
℃-70℃。
7. the method as described in any claim in claim 1 to 6, wherein the temperature of second continuous acid-washing is 48
℃-53℃。
8. the method as described in any claim in claim 1 to 7, wherein first continuous acid-washing and described second connects
The acid solution injection of continuous pickling produces the sector with joint.
9. the method as described in any claim in claim 1 to 8, wherein carry out described first using heavy caliber acid mouth connecting
Continuous pickling and second continuous acid-washing, preferably use oval heavy caliber acid mouth, more preferably using major diameter be about 8mm,
Minor axis diameter is about the oval heavy caliber acid mouth of 6mm.
10. the method as described in any claim in claim 1 to 9, it is also included to the two-phase of continuous acid-washing treatment not
Plate surface carries out continuous washing in rust steel, and preferably washing temperature is >=60 DEG C.
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| CN201611108497.4A CN106757072A (en) | 2016-12-06 | 2016-12-06 | Plate surface treatment method in two phase stainless steel |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709477A (en) * | 2009-11-28 | 2010-05-19 | 山西太钢不锈钢股份有限公司 | Method for continuous pickling of double-phase stainless steel coil |
| CN102719831A (en) * | 2012-05-29 | 2012-10-10 | 中冶南方工程技术有限公司 | Method for removing scales on surface of hot-rolled stainless steel strip |
| CN105568171A (en) * | 2016-01-07 | 2016-05-11 | 山西太钢不锈钢股份有限公司 | Method for improving cold stamping performance of 2205 duplex stainless steel cold plate |
-
2016
- 2016-12-06 CN CN201611108497.4A patent/CN106757072A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101709477A (en) * | 2009-11-28 | 2010-05-19 | 山西太钢不锈钢股份有限公司 | Method for continuous pickling of double-phase stainless steel coil |
| CN102719831A (en) * | 2012-05-29 | 2012-10-10 | 中冶南方工程技术有限公司 | Method for removing scales on surface of hot-rolled stainless steel strip |
| CN105568171A (en) * | 2016-01-07 | 2016-05-11 | 山西太钢不锈钢股份有限公司 | Method for improving cold stamping performance of 2205 duplex stainless steel cold plate |
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Application publication date: 20170531 |