CN109609962A - A kind of acid washing method of stainless steel band - Google Patents
A kind of acid washing method of stainless steel band Download PDFInfo
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- CN109609962A CN109609962A CN201811639792.1A CN201811639792A CN109609962A CN 109609962 A CN109609962 A CN 109609962A CN 201811639792 A CN201811639792 A CN 201811639792A CN 109609962 A CN109609962 A CN 109609962A
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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
- C23G1/086—Iron or steel solutions containing HF
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/023—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by spraying
-
- 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
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
Abstract
The invention discloses a kind of acid washing methods of stainless steel band, comprising: the stainless steel band after annealing is carried out electrolysis processing by the first electrolytic cell；Stainless steel band is subjected to pickling processes by the first descaling bath；Stainless steel band is subjected to pickling processes by the second descaling bath；Stainless steel band is subjected to pickling processes by third descaling bath；Stainless steel band is rinsed by 4-6 grades of tandems, and is dried；Wherein, first descaling bath, the second descaling bath, third descaling bath waste discharge amount be V, steel band the first descaling bath, the second descaling bath, third descaling bath medium in volume be V1, then V=(4ml/m3‑6ml/m3)*V1.It using the present invention, can be adjusted according to waste discharge amount of the stainless steel band of friction speed or thickness to acid, reach a balance between the consumption of metal ion and the consumption of acid, to reduce sour discharge, realize energy-saving and emission-reduction.
Description
Technical field
The present invention relates to stainless steel technical field more particularly to a kind of acid washing methods of stainless steel band.
Background technique
Stainless steel band is the extension of ultra-thin stainless steel plate, mainly meets different each eka-golds of industrial department industrialized production
Belong to or the needs of engineering goods and the narrow and long steel plate of one kind that produces, be widely used in high-tech industry, IT industry and
Aeronautics and Astronautics industry, added value are high.
It will form iron scale or oxide skin(coating) in belt steel surface in stainless steel and acid resisting alloy steel rolling and annealing process.Iron
Squama layer is made of the oxide of ferrochrome oxide, ferriferous oxide and other alloying elements.Their mixed proportion by composition of steel, move back
Fiery condition (temperature, heating cycle and atmosphere) and other parameters determine.
Most of metal oxide in iron scale layer exists in the form of spinelle, it is extremely difficult to dissolve in acid.Moreover, having
It will form the Chrome-free band of certain ingredient and thickness in a little situations under iron scale layer.In order to guarantee the property of belt steel surface, surface
Chromium content must be consistent in strip.Iron scale layer and Chrome-free band are gone by the multistage pickling in various solution from belt steel surface
It removes.
Acid washing conditions have been simply provided in existing acid cleaning process mostly, and in acid cleaning process, sour discharge can be related to, no
Conducive to energy-saving and emission-reduction.The Chinese patent of 106244783 B of Publication No. CN discloses a kind of " stainless steel strip continuous production side
Method ", including it is cold rolling, annealing, derusting, smooth and etc., wherein the strip after annealing carries out processing of rust removing, altogether three phases: drawing
Rectify the scale breading stage: strip makes strip generate 1.2% elongation percentage through straightening descaling mill, and the oxide skin of belt steel surface, which is broken, peels off；
Electrolysis stage: the strip after straightening scale breading is immersed in neutral salt sodium sulphate electrolyte, and 80 DEG C of electrolysis temperature, sodium sulfate concentration
220g/L, pH value 5.5, electrolysis time 30s；The acid wash passivation stage: the strip after electrolysis is immersed in nitric acid and hydrofluoric acid mixes
Pickling is carried out in solution, concentration of nitric acid 150g/L, hydrofluoric acid concentration 30g/L, remove belt steel surface oxidation rust by 58 DEG C of pickling temperature
Skin.
In above-mentioned acid washing conditions, the stainless steel band of friction speed or thickness is easy to generate fluctuation, Wu Fa to the concentration of acid
Reach a balance between the consumption of metal ion and the consumption of acid, causes the sour discharge amount of acid cleaning process larger.
Summary of the invention
Technical problem to be solved by the present invention lies in, a kind of acid washing method of stainless steel band is provided, it can be according to difference
The stainless steel band of speed or thickness is adjusted the waste discharge amount of acid, reaches one between the consumption of metal ion and the consumption of acid
A balance realizes energy-saving and emission-reduction to reduce sour discharge.
To solve the above-mentioned problems, the acid washing method of a kind of stainless steel band provided by the invention, comprising:
Stainless steel band after annealing is subjected to electrolysis processing by the first electrolytic cell, the medium of first electrolytic cell is
Na2SO4Solution；
Stainless steel band is subjected to pickling processes by the first descaling bath, the medium of the first descaling bath is HNO3With the mixing of HF
Object, and HNO is injected to the first descaling bath by charging mechanism3With the mixture of HF and pass through waste discharge mechanism discharge part HNO3With
The mixture of HF, so that the medium circulation of the first descaling bath flows；
Stainless steel band is subjected to pickling processes by the second descaling bath, the medium of the second descaling bath is HNO3With the mixing of HF
Object, and HNO is injected to the second descaling bath by charging mechanism3With the mixture of HF and pass through waste discharge mechanism discharge part HNO3With
The mixture of HF, so that the medium circulation of the second descaling bath flows；
Stainless steel band is subjected to pickling processes by third descaling bath, the medium of third descaling bath is HNO3With the mixing of HF
Object, and HNO is injected to third descaling bath by charging mechanism3With the mixture of HF and pass through waste discharge mechanism discharge part HNO3With
The mixture of HF, so that the medium circulation of third descaling bath flows；
Stainless steel band is rinsed by 4-6 grades of tandems, and is dried；
Wherein, first descaling bath, the second descaling bath, third descaling bath waste discharge amount be V, steel band is in the first pickling
Slot, the second descaling bath, third descaling bath medium in volume be V1, then
V=(4ml/m3-6ml/m3)*V1。
As an improvement of the above scheme, first descaling bath, the second descaling bath, third descaling bath waste discharge amount be V, steel
Band the first descaling bath, the second descaling bath, third descaling bath medium in volume be V1, then
V=5ml/m3*V1。
As an improvement of the above scheme, the waste discharge amount of first descaling bath is respectively 25-40ml/min, second acid
The waste discharge amount of washing trough is 15-30ml/min, and the waste discharge amount of third descaling bath is 15-30ml/min.
As an improvement of the above scheme, HNO is added in first descaling bath3Amount with the mixture of HF is 35-55g/L,
HNO is added in second descaling bath3Amount with the mixture of HF is 35-55g/L, and HNO is added in the third descaling bath3With HF's
The amount of mixture is 30-50g/L.
As an improvement of the above scheme, the Na of first electrolytic cell2SO4The concentration < 200g/L of solution, metal ion
Concentration < 15g/L, temperature are 75-85 DEG C, current density 0-20A/dm2, concentration the < 5g/L, suspension content < of Cr VI
4g/L；
The HNO of first descaling bath3Concentration be 80-150g/L, the concentration of HF is 3-40g/L, metal ion it is dense
< 35g/L is spent, temperature is 40-65 DEG C；
The HNO of second descaling bath3Concentration be 80-150g/L, the concentration of HF is 3-40g/L, metal ion it is dense
< 35g/L is spent, temperature is 40-65 DEG C；
The HNO of the third descaling bath3Concentration be 80-150g/L, the concentration of HF is 3-40g/L, metal ion it is dense
< 35g/L is spent, temperature is 40-65 DEG C.
As an improvement of the above scheme, the Na of first electrolytic cell2SO4The concentration 150-200g/L of solution, metal ion
Concentration < 15g/L, temperature be 75-85 DEG C, current density 5-10A/dm2, the concentration 0.5-1.5g/L of Cr VI, suspended matter
Content < 4g/L；
The HNO of first descaling bath3Concentration be 100-130g/L, the concentration of HF is 10-40g/L, metal ion
Concentration < 25g/L, temperature are 45-60 DEG C；
The HNO of second descaling bath3Concentration be 100-130g/L, the concentration of HF is 10-40g/L, metal ion
Concentration < 25g/L, temperature are 45-60 DEG C；
The HNO of the third descaling bath3Concentration be 100-130g/L, the concentration of HF is 10-40g/L, metal ion
Concentration < 25g/L, temperature are 45-60 DEG C.
As an improvement of the above scheme, the thickness 0.3-3mm of the stainless steel band, transmission speed 100-200m/min.
As an improvement of the above scheme, successively include: by 6 grades of tandem rinsings by stainless steel band
Stainless steel band is rinsed by the first spray rinsing slot, the first spray rinsing slot includes one individual
Circulating tank；
Stainless steel band is rinsed by the second spray rinsing slot, the second spray rinsing slot includes one individual
Circulating tank；
Stainless steel band is rinsed by double brush machines；
Stainless steel band is rinsed by third spray rinsing slot, the third spray rinsing slot includes one individual
Circulating tank；
Stainless steel band is drenched potcher by thermal jet to rinse, the thermal jet leaching potcher includes an individually circulation
Tank, 95 DEG C of the temperature < of rinse water；
After 6 grades of tandems rinse, the concentration < 10mg/L of total acid.
As an improvement of the above scheme, the composition by weight percent of the stainless steel band finished product are as follows:
C 0.01~0.05%, Ni 6.0~9.5%, Cr 16.5~20.0%, Mn 0.1~3.0%, Cu 0.01~
0.2%, Si 0.15~1.0%, P 0.01~0.2%, S 0.01-0.1%, N 0.02~0.15%, remaining is Fe and can not
Avoid impurity.
As an improvement of the above scheme, the stainless steel band finished product with a thickness of 0.3-3mm, yield strength 300-
350MPa, tensile strength 700-750MPa, extensibility 60-70%, hardness 170-190HV, surface roughness 0.15-
0.25μm。
The invention has the following beneficial effects:
(1) acid washing method of a kind of stainless steel band provided by the invention, by setting the first descaling bath, the second descaling bath,
The waste discharge amount V and steel band of third descaling bath the first descaling bath, the second descaling bath, third descaling bath medium in volume V1 it
Between relationship, V=(4ml/m3-6ml/m3) * V1, so as to obtain steel band in pickling according to the speed and thickness of stainless steel band
Then real-time volume in medium adjusts waste discharge amount in real time, reach between the consumption of metal ion and the consumption of acid
One balance, to reduce sour discharge, while reducing power consumption, realizes energy-saving and emission-reduction.
(2) present invention can also according to waste discharge amount, to the first descaling bath, the second descaling bath, third descaling bath HNO3
It is adjusted with the additional amount of the mixture of HF, to efficiently be removed to iron scale layer and Chrome-free band.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention will be made below further detailed
Description.
A kind of acid washing method of stainless steel band provided by the invention, comprising:
(1) stainless steel band after annealing is subjected to electrolysis processing, the medium of first electrolytic cell by the first electrolytic cell
For Na2SO4Solution；
Stainless steel band is needed before pickling by annealing, and the annealing includes:
(A) stainless steel band Jing Guo cold rolling is transmitted in the bringing-up section of annealing furnace, the bringing-up section of the annealing furnace is successively
Including inlet seal section, preheating zone, heating zone and exit seal section,
Stainless steel band by cold rolling is transmitted to the inlet seal section of annealing furnace, passes through convection current and the spoke of flue gas in preheating zone
It penetrates and the pre-heat treatment is carried out to stainless steel band, so that stainless steel band is heated to T from 30 DEG C1, T1=250-300 DEG C；
Stainless steel band after preheating is transmitted to heating zone, is heated by the flame that burner sprays, so that stainless
Steel band is from T11160 DEG C are heated to, and stainless steel band was at temperature at least 15 seconds of 1080 DEG C or more；
Stainless steel band after heating is transmitted to exit seal section；
(B) stainless steel band after heating is cooled to 180 DEG C or less by air-cooled section；
(C) stainless steel band after will be air-cooled is cooled to 70 DEG C or less by water cooling section；
(D) stainless steel band after water cooling is removed to the moisture of stainless steel band surface by squeeze roller；
(E) stainless steel band is dried.
It will form iron scale or oxide skin(coating) in belt steel surface in rolled stainless steel and annealing process.Iron scale layer is by ferrochrome oxygen
The oxide of compound, ferriferous oxide and other alloying elements forms.Their mixed proportion by composition of steel, annealing conditions (temperature,
Heating cycle and atmosphere) and other parameters decision.
Stainless steel band after annealing carries out pickling processes by pickling system, and pickling system includes the first electrolytic cell, first
Descaling bath, the second descaling bath, third descaling bath and rinsing equipment, step (1) acid pickling step specifically include:
Stainless steel band after annealing is subjected to electrolysis processing by the first electrolytic cell, the medium of first electrolytic cell is
Na2SO4Solution, Na2SO4The concentration < 200g/L of solution, the concentration < 15g/L of metal ion, temperature are 75-85 DEG C, and electric current is close
Degree is 0-20A/dm2, concentration < 5g/L, suspension content the < 4g/L of Cr VI.
Preferably, the Na of first electrolytic cell2SO4The concentration 150-200g/L of solution, the concentration < 15g/ of metal ion
L, temperature are 75-85 DEG C, current density 5-10A/dm2, the concentration 0.5-1.5g/L of Cr VI, suspension content < 4g/L.
The iron scale layer part of stainless steel band is made of iron-based oxide, can be effectively removed by electrolysis process.Pickling exists
Occur in the aqueous solution of sodium sulphate electrolyte.Technique uses DC power supply.Electrolyte de-scaling is by neutral conductor system strip
The result of anode and cathode alternant polarization.Therefore, stainless steel band can remove Fe by the first electrolytic cell2O3, NiO and Cr2O3,
Corresponding metal ion (Fe3+、Cr3+、Ni2+) hydroxide formed in neutral solution by hydrolysis, that is, the iron dissolved
Squama, iron ion and a part of nickel and chromium ion are precipitated in the form of hydroxide sludge, meanwhile, form chromate.Cathodic pickling
Belt steel surface is rinsed and scrubbed in brush machine unit afterwards, iron scale residue and hydroxide mud granule are removed.
(2) stainless steel band is subjected to pickling processes by the first descaling bath, the medium of the first descaling bath is HNO3's and HF
Mixture, and HNO is injected to the first descaling bath by charging mechanism3With the mixture of HF and pass through waste discharge mechanism discharge part
HNO3With the mixture of HF so that the medium circulation of the first descaling bath flows；
The HNO of first descaling bath3Concentration be 80-150g/L, the concentration of HF is 3-40g/L, metal ion it is dense
< 35g/L is spent, temperature is 40-65 DEG C.Preferably, the HNO of first descaling bath3Concentration be 100-130g/L, HF's is dense
Degree is 10-40g/L, and the concentration < 25g/L of metal ion, temperature is 45-60 DEG C.
First descaling bath carries out first order pickling processes, after first order pickling remaining iron scale by complicated iron, chromium,
Nickel oxide composition, the present invention remove these complicated oxides using the mixture of nitric acid and hydrofluoric acid, and without layers of chrome.
(3) stainless steel band is subjected to pickling processes by the second descaling bath, the medium of the second descaling bath is HNO3With HF's
Mixture, and HNO is injected to the second descaling bath by charging mechanism3With the mixture of HF and pass through waste discharge mechanism discharge part
HNO3With the mixture of HF so that the medium circulation of the second descaling bath flows；
The HNO of second descaling bath3Concentration be 80-150g/L, the concentration of HF is 3-40g/L, metal ion it is dense
< 35g/L is spent, temperature is 40-65 DEG C.Preferably, the HNO of second descaling bath3Concentration be 100-130g/L, HF's is dense
Degree is 10-40g/L, and the concentration < 25g/L of metal ion, temperature is 45-60 DEG C.
(4) stainless steel band is subjected to pickling processes by third descaling bath, the medium of third descaling bath is HNO3With HF's
Mixture, and HNO is injected to third descaling bath by charging mechanism3With the mixture of HF and pass through waste discharge mechanism discharge part
HNO3With the mixture of HF so that the medium circulation of third descaling bath flows；
The HNO of the third descaling bath3Concentration be 80-150g/L, the concentration of HF is 3-40g/L, metal ion it is dense
< 35g/L is spent, temperature is 40-65 DEG C.Preferably, the HNO of the third descaling bath3Concentration be 100-130g/L, HF's is dense
Degree is 10-40g/L, and the concentration < 25g/L of metal ion, temperature is 45-60 DEG C.
Due to the high quality requirement of strip pickling, nitration mixture technique is carried out with three-level.In the last one descaling bath last
Partial oxide is removed.The smooth of surface is carried out simultaneously, guarantees the pickling of high quality by the nitric acid of Strong oxdiative.
First electrolytic cell, the first descaling bath, the second descaling bath, third descaling bath medium parameter setting, should
It is set according to differential profiles, to reach optimal pickling effect.
Preferably, when stainless steel band is 304, the medium of first electrolytic cell is Na2SO4Solution, Na2SO4Solution
Concentration < 200g/L, the concentration < 15g/L of metal ion, temperature are 75-85 DEG C, current density 10-20A/dm2, Cr VI
Concentration < 5g/L, suspension content < 4g/L；
First descaling bath, the second descaling bath, HNO in third descaling bath3Concentration be 80-150g/L, the concentration of HF is 10-
40g/L, the concentration < 35g/L of metal ion, temperature are 60-65 DEG C.
Preferably, when stainless steel band is 200, the medium of first electrolytic cell is Na2SO4Solution, Na2SO4Solution
Concentration < 200g/L, the concentration < 15g/L of metal ion, temperature are 75-85 DEG C, current density 10-20A/dm2, Cr VI
Concentration < 5g/L, suspension content < 4g/L；
First descaling bath, the second descaling bath, HNO in third descaling bath3Concentration be 80-150g/L, the concentration of HF is 3-
10g/L, the concentration < 35g/L of metal ion, temperature are 45-50 DEG C.
(5) stainless steel band is rinsed by 4-6 grades of tandems, and dried；
Preferably, successively include: by 6 grades of tandem rinsings by stainless steel band
Stainless steel band is rinsed by the first spray rinsing slot, the first spray rinsing slot includes one individual
Circulating tank；
Stainless steel band is rinsed by the second spray rinsing slot, the second spray rinsing slot includes one individual
Circulating tank；
Stainless steel band is rinsed by double brush machines；
Stainless steel band is rinsed by third spray rinsing slot, the third spray rinsing slot includes one individual
Circulating tank；
Stainless steel band is drenched potcher by thermal jet to rinse, the thermal jet leaching potcher includes an individually circulation
Tank, 95 DEG C of the temperature < of rinse water；
After 6 grades of tandems rinse, the concentration < 10mg/L of total acid.
The stainless steel band can remove remaining substance after electrolysis, pickling, obtain smooth after 6 grades of tandems rinse
Bright stainless steel band product.
Existing acid cleaning process has been simply provided acid washing conditions mostly, and the stainless steel band of friction speed or thickness is easy to acid
Concentration generate fluctuation, can not metal ion consumption and acid consumption between reach a balance, cause acid cleaning process
Sour discharge amount is larger.
Inventor is found surprisingly that in process of innovation, when waste discharge amount and steel band are in the first descaling bath, the second descaling bath,
It, can be between the consumption of metal ion and the consumption of acid when real-time volume in the medium of three descaling baths reaches a certain relation value
Reach a balance, not only iron scale layer and Chrome-free band can efficiently be removed, but also the discharge of acid can be reduced.Specifically, false
If the waste discharge amount of the first descaling bath, the second descaling bath, third descaling bath is V, steel band is in the first descaling bath, the second descaling bath, the
Volume in the medium of three descaling baths is V1, then V=(4ml/m3-6ml/m3)*V1。
As V < 4ml/m3* when V1, the consumption of metal ion is excessive, influences the removal effect of iron scale layer and Chrome-free band, electricity
It can consume also larger；As V > 6ml/m3* when V1, sour consumption is excessive, increases the discharge of acid, cannot reach energy-saving and emission-reduction
Effect.
It is optimal, first descaling bath, the second descaling bath, third descaling bath waste discharge amount be V, steel band is in the first pickling
Slot, the second descaling bath, third descaling bath medium in volume be V1, then V=5ml/m3*V1.It can be according to stainless steel band
Speed and thickness obtain real-time volume of the steel band in pickling medium, are then adjusted in real time to waste discharge amount, in metal ion
Consumption and acid consumption between reach optimal balance point, greatly reduce sour discharge, while reducing power consumption, realize energy conservation
Emission reduction, and effectively remove iron scale layer and Chrome-free band.
It should be noted that stainless steel band with a thickness of d, width a, speed v, then V1=d*a*v, unit mm3/
min。
It is preferably 100-200m/min that the thickness of the stainless steel band, which is preferably 0.3-3mm, transmission speed,.The stainless steel
Transmission speed and pickling time of the band in acid cleaning process should also optimize adjustment according to differential profiles.
Preferably, when stainless steel band is 200, transmission speed 200m/min, the slot total length of the first electrolytic cell is 90-
100m, anode segment length are 35-38m, and processing total time is 28-30s, anodic treatment times 9-11s；First descaling bath,
Two descaling baths, third descaling bath total length be 75-85m, pickling time 22-26s.
Preferably, when stainless steel band is 304, transmission speed 200m/min, the slot total length of the first electrolytic cell is 90-
100m, anode segment length are 35-38m, and processing total time is 28-30s, anodic treatment times 9-11s；First descaling bath,
Two descaling baths, third descaling bath total length be 75-85m, pickling time 22-26s.
Preferably, when stainless steel band is 316, transmission speed 160m/min, the slot total length of the first electrolytic cell is 90-
100m, anode segment length are 35-38m, and processing total time is 34-39s, anodic treatment times 11-16s；First descaling bath,
Two descaling baths, third descaling bath total length be 75-85m, pickling time 28-32s.
As a preferred embodiment, the waste discharge amount of first descaling bath is respectively 25-40ml/min, second acid
The waste discharge amount of washing trough is 15-30ml/min, and the waste discharge amount of third descaling bath is 15-30ml/min.
HNO is added in first descaling bath3Amount with the mixture of HF is 35-55g/L, and second descaling bath is added
HNO3Amount with the mixture of HF is 35-55g/L, and HNO is added in the third descaling bath3Amount with the mixture of HF is 30-50g/
L。
As a more preferably embodiment, the waste discharge amount of first descaling bath is respectively 30-35ml/min, second acid
The waste discharge amount of washing trough is 20-25ml/min, and the waste discharge amount of third descaling bath is 20-25ml/min.
HNO is added in first descaling bath3Amount with the mixture of HF is 40-45g/L, and second descaling bath is added
HNO3Amount with the mixture of HF is 40-45g/L, and HNO is added in the third descaling bath3Amount with the mixture of HF is 35-40g/
L。
Therefore, the present invention can obtain real-time volume of the steel band in pickling medium according to the speed and thickness of stainless steel band
Product, then adjusts waste discharge amount in real time, reaches a balance between the consumption of metal ion and the consumption of acid, to subtract
Few acid discharge, while power consumption is reduced, realize energy-saving and emission-reduction.Compared with prior art, the present invention can drop sour discharge amount
The consumption of electric energy is reduced 5-10% by low 10-20%.Moreover, the present invention can also according to waste discharge amount, to the first descaling bath,
The HNO of second descaling bath, third descaling bath3It is adjusted with the additional amount of the mixture of HF, thus to iron scale layer and Chrome-free band
It is efficiently removed, iron scale layer and Chrome-free band carry out removal rate and be up to 99.9%.
To sum up, it makes annealing treatment through the invention, the composition by weight percent of stainless steel band finished product obtained are as follows:
C 0.01~0.05%, Ni 6.0~9.5%, Cr 16.5~20.0%, Mn 0.1~3.0%, Cu 0.01~
0.2%, Si 0.15~1.0%, P 0.01~0.2%, S 0.01-0.1%, N 0.02~0.15%, remaining is Fe and can not
Avoid impurity.
Specifically, C 0.01~0.05% and Si 0.15~1.0%, can promote austenite to be formed, and stable austenite
Tissue, while the intensity of stainless steel can be improved, and obtain good forming property, it is suitble to cold-rolling process to carry out.Arrange in pairs or groups Mn again
0.1~3.0% and Ni 6.0~9.5% can improve the mechanical property of stainless steel band with stable austenite, furthermore, it is possible to improve
The forming property of stainless steel band is suitble to cold-rolling process to carry out, and lays the foundation for the subsequent good version type of acquisition.Contain Cr 16.5
~20.0%, so that the stainless steel band is obtained good corrosion resistance.Containing N 0.02~0.15%, can with stable austenite,
Be conducive to improve the intensity and corrosion resistance of stainless steel band simultaneously.Cu 0.01~0.2% can reduce austenite phase fault
Can, improve the plasticity and forming property of stainless steel band.
Preferably, the composition by weight percent of the stainless steel band finished product as made from above-mentioned cold rolling process are as follows:
C 0.03~0.04%, Ni 7.0~9.0%, Cr 17.5~19.0%, Mn 0.5~2.0%, Cu 0.02~
0.08%, Si 0.40~0.80%, P 0.02~0.05%, S 0.01-0.05%, N 0.02~0.06%, remaining for Fe and
Inevitable impurity.
The mechanical property of the stainless steel band finished product is as follows:
| Project | Numerical value |
| Thickness | 0.3-3mm |
| Yield strength | 300-350MPa |
| Tensile strength | 700-750MPa |
| Extensibility | 60-70% |
| Hardness | 170-190HV |
| Surface roughness | 0.15-0.25μm |
With specific embodiment, the present invention is further explained below
(1) preparation method of stainless steel:
1, thickness stainless steel band blank is selected；
2, upper volume is carried out to stainless steel band blank；
3, the stainless steel band blank after upper volume is transmitted on laser-beam welding machine by entry loop, to different volume stainless steels
Band blank carries out laser welding；
4, the stainless steel band blank after laser welding is subjected to the first passage cold rolling by the first cold-rolling mill；
5, the stainless steel band blank after the first passage cold rolling is subjected to the second passage cold rolling by the second cold-rolling mill；
6, the stainless steel band blank after the second passage cold rolling is subjected to the cold rolling of third passage by third cold-rolling mill；
7, the stainless steel band blank after third passage cold rolling is subjected to four-pass cold rolling by the 4th cold-rolling mill；
8, the stainless steel band blank after four-pass cold rolling is subjected to the 5th passage cold rolling by the 5th cold-rolling mill；
9, the stainless steel band blank after the 5th passage cold rolling is subjected to the 6th passage cold rolling by the 6th cold-rolling mill；
10, the stainless steel band blank after the 6th passage cold rolling is cleaned；
11, the stainless steel band blank after cleaning is transmitted to subsequent processing by outlet looping, is dried, cleaned, is obtained
To stainless steel band semi-finished product；
12, the stainless steel band semi-finished product after drying are made annealing treatment；
13, the stainless steel band semi-finished product after annealing are electrolysed, pickling, are specifically included:
Stainless steel band is subjected to electrolysis processing by the first electrolytic cell；
Stainless steel band is subjected to pickling processes by the first descaling bath；
Stainless steel band is subjected to pickling processes by the second descaling bath；
Stainless steel band is subjected to pickling processes by third descaling bath；
By stainless steel band by 6 grades of tandem rinsings, and dry；
14, the stainless steel band semi-finished product straightening after pickling is smooth, obtain stainless steel band finished product.
(2) acid cleaning process parameter is as follows:
(3) it is as follows that stainless steel band end properties is made:
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Thickness range | 0.3~3mm | 0.3~3mm | 0.3~3mm |
| Yield strength | 348MPa | 334MPa | 347MPa |
| Tensile strength | 735MPa | 722MPa | 742MPa |
| Extensibility | 62% | 70% | 65% |
| Hardness | 178HV | 175HV | 173HV |
| Surface roughness | 0.20μm | 0.18μm | 0.21μm |
| Pickling waste discharge amount | 75ml/min | 90ml/min | 120ml/min |
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, therefore equivalent changes made in accordance with the claims of the present invention, are still within the scope of the present invention.
Claims (10)
1. a kind of acid washing method of stainless steel band characterized by comprising
Stainless steel band after annealing is subjected to electrolysis processing by the first electrolytic cell, the medium of first electrolytic cell is Na2SO4
Solution；
Stainless steel band is subjected to pickling processes by the first descaling bath, the medium of the first descaling bath is HNO3With the mixture of HF, and
HNO is injected to the first descaling bath by charging mechanism3With the mixture of HF and pass through waste discharge mechanism discharge part HNO3With mixing for HF
Object is closed, so that the medium circulation of the first descaling bath flows；
Stainless steel band is subjected to pickling processes by the second descaling bath, the medium of the second descaling bath is HNO3With the mixture of HF, and
HNO is injected to the second descaling bath by charging mechanism3With the mixture of HF and pass through waste discharge mechanism discharge part HNO3With mixing for HF
Object is closed, so that the medium circulation of the second descaling bath flows；
Stainless steel band is subjected to pickling processes by third descaling bath, the medium of third descaling bath is HNO3With the mixture of HF, and
HNO is injected to third descaling bath by charging mechanism3With the mixture of HF and pass through waste discharge mechanism discharge part HNO3With mixing for HF
Object is closed, so that the medium circulation of third descaling bath flows；
Stainless steel band is rinsed by 4-6 grades of tandems, and is dried；
Wherein, first descaling bath, the second descaling bath, third descaling bath waste discharge amount be V, steel band is in the first descaling bath, the
Two descaling baths, third descaling bath medium in volume be V1, then
V=(4ml/m3-6ml/m3)*V1。
2. the acid washing method of stainless steel band as described in claim 1, which is characterized in that first descaling bath, the second pickling
Slot, third descaling bath waste discharge amount be V, steel band the first descaling bath, the second descaling bath, third descaling bath medium in volume
For V1, then
V=5ml/m3*V1。
3. the acid washing method of stainless steel band as described in claim 1, which is characterized in that the waste discharge amount of first descaling bath point
Not Wei 25-40ml/min, the waste discharge amount of second descaling bath is 15-30ml/min, and the waste discharge amount of third descaling bath is 15-
30ml/min。
4. the acid washing method of stainless steel band as claimed in claim 3, which is characterized in that HNO is added in first descaling bath3With
The amount of the mixture of HF is 35-55g/L, and HNO is added in second descaling bath3Amount with the mixture of HF is 35-55g/L, institute
It states third descaling bath and HNO is added3Amount with the mixture of HF is 30-50g/L.
5. the acid washing method of stainless steel band as described in claim 1, which is characterized in that the Na of first electrolytic cell2SO4It is molten
The concentration < 200g/L of liquid, the concentration < 15g/L of metal ion, temperature are 75-85 DEG C, current density 0-20A/dm2, sexavalence
Concentration < 5g/L, suspension content the < 4g/L of chromium；
The HNO of first descaling bath3Concentration be 80-150g/L, the concentration of HF is 3-40g/L, the concentration < of metal ion
35g/L, temperature are 40-65 DEG C；
The HNO of second descaling bath3Concentration be 80-150g/L, the concentration of HF is 3-40g/L, the concentration < of metal ion
35g/L, temperature are 40-65 DEG C；
The HNO of the third descaling bath3Concentration be 80-150g/L, the concentration of HF is 3-40g/L, the concentration < of metal ion
35g/L, temperature are 40-65 DEG C.
6. the acid washing method of stainless steel band as claimed in claim 5, which is characterized in that the Na of first electrolytic cell2SO4It is molten
The concentration 150-200g/L of liquid, the concentration < 15g/L of metal ion, temperature are 75-85 DEG C, current density 5-10A/dm2, six
The concentration 0.5-1.5g/L of valence chromium, suspension content < 4g/L；
The HNO of first descaling bath3Concentration be 100-130g/L, the concentration of HF is 10-40g/L, the concentration < of metal ion
25g/L, temperature are 45-60 DEG C；
The HNO of second descaling bath3Concentration be 100-130g/L, the concentration of HF is 10-40g/L, the concentration < of metal ion
25g/L, temperature are 45-60 DEG C；
The HNO of the third descaling bath3Concentration be 100-130g/L, the concentration of HF is 10-40g/L, the concentration < of metal ion
25g/L, temperature are 45-60 DEG C.
7. the acid washing method of stainless steel band as described in claim 1, which is characterized in that the thickness 0.3- of the stainless steel band
3mm, transmission speed 100-200m/min.
8. the acid washing method of stainless steel band as described in claim 1, which is characterized in that stainless steel band is passed through 6 grades of tandem drifts
It washes, successively includes:
Stainless steel band is rinsed by the first spray rinsing slot, the first spray rinsing slot includes an individually circulation
Tank；
Stainless steel band is rinsed by the second spray rinsing slot, the second spray rinsing slot includes an individually circulation
Tank；
Stainless steel band is rinsed by double brush machines；
Stainless steel band is rinsed by third spray rinsing slot, the third spray rinsing slot includes an individually circulation
Tank；
Stainless steel band is drenched potcher by thermal jet to rinse, the thermal jet leaching potcher includes an individual circulating tank,
95 DEG C of the temperature < of rinse water；
After 6 grades of tandems rinse, the concentration < 10mg/L of total acid.
9. the acid washing method of stainless steel band as described in claim 1, which is characterized in that the ingredient weight of the stainless steel band finished product
Measure percentage are as follows:
C 0.01~0.05%, Ni 6.0~9.5%, Cr 16.5~20.0%, Mn 0.1~3.0%, Cu 0.01~
0.2%, Si 0.15~1.0%, P 0.01~0.2%, S 0.01-0.1%, N 0.02~0.15%, remaining is Fe and can not
Avoid impurity.
10. the acid washing method of stainless steel band as described in claim 1, which is characterized in that the thickness of the stainless steel band finished product
For 0.3-3mm, yield strength 300-350MPa, tensile strength 700-750MPa, extensibility 60-70%, hardness is
170-190HV, surface roughness are 0.15-0.25 μm.
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| CN115044917A (en) * | 2022-06-21 | 2022-09-13 | 北京首钢冷轧薄板有限公司 | Method and device for determining pickling speed of hot-rolled strip steel |
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