CN105586600B - A kind of cold rolled annealed acid cleaning process of two phase stainless steel - Google Patents
A kind of cold rolled annealed acid cleaning process of two phase stainless steel Download PDFInfo
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- CN105586600B CN105586600B CN201610149729.4A CN201610149729A CN105586600B CN 105586600 B CN105586600 B CN 105586600B CN 201610149729 A CN201610149729 A CN 201610149729A CN 105586600 B CN105586600 B CN 105586600B
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
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- 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
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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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
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- 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
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a kind of cold rolled annealed acid cleaning process of two phase stainless steel, belong to two phase stainless steel technical field of smelting.The technique carries out as steps described below：Connect annealing temperature and stainless-steel roll similar in two phase stainless steel annealing temperature respectively in two phase stainless steel front-end and back-end；Process speed is set, according to coil of strip thickness and process speed, calculates TV values, the fire box temperature that each area is set according to TV values anneals to coil of strip；Then the stainless-steel roll after annealing is subjected to Na2SO4Electrolysis, HNO3Electrolysis, scrub, nitration mixture pickling and desalted water washing, the stainless-steel roll for finally cutting away double-phase stainless steel coil front-end and back-end can obtain double-phase stainless steel coil finished product.By the present invention in that with appropriate annealing and pickling technique, solve the problems, such as that two phase stainless steel pickling rear surface black stripe and easy contracting width and the thickness of generating occurs and is thinned, the oxidation film of two-phase stainless steel surface is completely eliminated, coil of strip surface gloss is high, has reached the quality requirement of product.
Description
Technical field
The invention belongs to two phase stainless steel technical field of smelting, and in particular to a kind of cold rolled annealed pickling work of two phase stainless steel
Skill.
Background technology
Two phase stainless steel refers to ferrite and respectively accounts for about 50% with austenite, and the content of general less phase is at least also required to reach 30%
Stainless steel.In the case of relatively low containing C, Cr contents are 18-28%, and Ni contents are 3-10%.Its oxide skin is complicated, cold rolling
When annealing and pickling be to influence the key link of properties of product and surface quality.Wherein acid cleaning process it is reasonable whether, direct shadow
The surface quality to product is rung, and constrains manufacturing schedule to a certain extent；And annealing temperature is to the mechanics of two phase stainless steel
Performance has a major impact, and with the raising of annealing temperature, the intensity of two phase stainless steel reduces, and easily generates contracting width and thickness is thinned
Problem.
When carrying out two phase stainless steel production using cold rolled annealed acid cleaning process of the prior art, it is primarily present following
Problem：（1）For guarantee pickling quality, relatively low process speed is generally selected, has caused strip longer in the annealing furnace residence time,
Surface after pickling is caused not by the pickling complexity of the oxide skin difference that surface layer austenite and ferritic phase are generated
Exist with regional roughness difference, and in belt steel surface largely along the black stripe for being difficult to get rid of of rolling direction（Fig. 1）, and
In order to eliminate band tissue, often need to strip be subjected to multipass pickling；（2）Thickness is produced as 1.5mm and its product of following specification
When, the wide and thickness that contracts is thinned seriously, eventually leads to product and cuts useless amount greatly, lumber recovery is low.
Invention content
The object of the present invention is to provide a kind of cold rolled annealed acid cleaning process of two phase stainless steel, to solve two phase stainless steel cold
The problem of existing surface acid-washing is bad and contracting is wide during annealing and pickling and thickness is thinned is rolled, ensures product surface quality
And dimensionally stable, pickling number is reduced, reduces production cost.
The cold rolled annealed acid cleaning process of two phase stainless steel of the present invention, includes the following steps：
A. it is connected respectively in double-phase stainless steel coil front-end and back-end similar in annealing temperature and two phase stainless steel annealing temperature
Stainless-steel roll, to realize continuous production；
B. process speed is set as 30-40m/min, according to double-phase stainless steel coil thickness and process speed, calculates TV values
（Thickness × process speed）, then according to TV values according to the fire box temperature of each annealed zone of annealing curve setting（Table 1）It carries out double
The annealing operation of phase stainless-steel roll；
The fire box temperature in each area when two phase stainless steel is annealed under 1 different TV value of table（℃）
C. the double-phase stainless steel coil after annealing is subjected to Na2SO4Electrolysis to dissolve the chromated oxide on coil of strip surface, destroys steel
It rolls up the oxidation film of surface compact and subsequent acid pickling step is made to play the effect of bigger in terms of coil of strip surface film oxide is removed,
Middle Na2SO4The proportion of solution is 1.15-1.20g/cm3, 65-75 DEG C of temperature, pH value 3-5, Faradaic current 100-200A
/cm2, electrolytic speed 10-30m/min；
D. double-phase stainless steel coil in c is continued into HNO3Electrolysis, ionizes oxidation film, to add using electrochemical action
Strong pickling effect, wherein HNO3A concentration of 110-150g/L of solution, 55-60 DEG C of temperature, Faradaic current 100-200A/cm2, electricity
Solve speed 10-30m/min；
E. two phase stainless steel in d is scrubbed using scrubbing unit, to remove double-phase stainless steel coil surface portion oxidation film,
Reduce pickling section burden, while improve coil of strip surface smoothness；Scrubbing unit electric current is 0.5-1.8A；
F. the double-phase stainless steel coil after being scrubbed in e is subjected to nitration mixture pickling, to remove the oxidation film on coil of strip surface completely, together
When makes coil of strip surface one layer of passivating film of generation, and to protect coil of strip surface, wherein acid washing conditions are：Pickling medium HNO3+ HF, temperature
55-60 DEG C, HNO3Concentration 140-170g/L, HF concentration 35-45g/L, concentration of metal ions ＜ 30g/L, pickling speed 10-30m/
min；
G. double-phase stainless steel coil in f is washed, to remove the nitration mixture of coil of strip remained on surface, prevent overpickling and shadow
Coil of strip surface quality is rung, washing conditions are：Wash medium desalted water, 45-60 DEG C of temperature, washing speed 10-30m/min；
H. the stainless-steel roll for cutting away the connection of double-phase stainless steel coil front-end and back-end obtains double-phase stainless steel coil finished product.
Two phase stainless steel in step a-h of the present invention is 2205 two phase stainless steels of cold rolling.
The present invention compared with the prior art, has the advantages that：
（1）The present invention is by Na2SO4Solution electrolysis, HNO3Electrolysis and nitration mixture pickling are combined, and improve pickling efficiency, are solved
There is the problem of black stripe in two phase stainless steel pickling rear surface, completely eliminated the oxidation film of two-phase stainless steel surface, steel
It is high to roll up surface gloss, has reached the quality requirement of 2205 two-phase stainless steel product；
（2）The present invention is provided with suitable process speed according to two phase stainless steel coil of strip thickness, and thus obtains TV values, so
It sets the fire box temperature of each annealed zone according to annealing curve according to TV values afterwards, ensure that stable annealing temperature, so as to solve
The problem of contracting is wide and thickness is thinned, easily occurs for two phase stainless steel coil of strip, and so that the two phase stainless steel coil of strip surface is formed uniformly
Oxidation film.
Description of the drawings
Fig. 1 is using treated the 2205 two phase stainless steel schematic surfaces of cold rolled annealed acid cleaning process in the prior art.
Fig. 2 is using cold rolled annealed acid cleaning process treated 2205 two phase stainless steel schematic surfaces in the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
Embodiment 1
A kind of thickness is the 2205 two phase stainless steel annealing and pickling technique of cold rolling hard state of 1.0mm, is included the following steps：
A. 304 austenite stainless coil of strips are connected respectively in double-phase stainless steel coil front-end and back-end；
B. process speed is set as 30m/min, and it is 30 to obtain TV values, and each annealing furnace is set according to annealing curve according to TV values
Thorax area temperature is as shown in table 2 below：
The fire box temperature in each area during the two phase stainless steel annealing that 2 TV values of table are 30（℃）
C. the stainless-steel roll after annealing is subjected to Na2SO4Electrolysis, Na2SO4Gravity 1.15g/cm3, temperature 70 C, pH
It is 5 to be worth, Faradaic current 100A/cm2, electrolytic speed 20m/min；
D. double-phase stainless steel coil in c is continued into HNO3Electrolysis, HNO3A concentration of 130g/L, temperature 60 C, Faradaic current
100A/cm2, electrolytic speed 20m/min；
E. double-phase stainless steel coil in d is scrubbed using scrubbing unit, scrubbing unit electric current is 1.5A；
F. the double-phase stainless steel coil after being scrubbed in e is subjected to nitration mixture pickling, pickling medium HNO3+ HF, temperature 60 C, HNO3
A concentration of 160g/L, HF concentration 40g/L, concentration of metal ions 10g/L, pickling speed 20m/min；
G. double-phase stainless steel coil in f is subjected to desalted water washing, temperature 50 C, washing speed 20m/min；
H. 304 austenite stainless coil of strips of double-phase stainless steel coil front-end and back-end are cut away, you can obtain double-phase stainless steel coil
Finished product, surface gloss is high, and stablizes without black stripe defect, width and thickness（Fig. 2）, reached 2205 two phase stainless steels
Quality requirement.
Embodiment 2
A kind of thickness is the 2205 two phase stainless steel annealing and pickling technique of cold rolling hard state of 0.5mm, is included the following steps：
A. 309S austenite stainless coil of strips are connected respectively in double-phase stainless steel coil front-end and back-end；
B. process speed is set as 40m/min, and it is 20 to obtain TV values, and it is as shown in table 3 below to set each area's temperature according to TV values：
The fire box temperature in each area during the two phase stainless steel annealing that 3 TV values of table are 20（℃）
C. the stainless-steel roll after annealing is subjected to Na2SO4Electrolysis, Na2SO4Gravity 1.15g/cm3, 65 DEG C of temperature, pH
It is 3 to be worth, Faradaic current 120A/cm2, electrolytic speed 10m/min；
D. double-phase stainless steel coil in c is continued into HNO3Electrolysis, HNO3Solution concentration is 110g/L, and 55 DEG C of temperature is electrolysed
Electric current 120A/cm2, electrolytic speed 10m/min；
E. double-phase stainless steel coil in d is scrubbed using scrubbing unit, scrubbing unit electric current is 0.5A；
F. the double-phase stainless steel coil after being scrubbed in e is subjected to nitration mixture pickling, pickling medium HNO3+ HF, 55 DEG C of temperature, HNO3
A concentration of 140g/L, HF concentration 35g/L, pickling speed 30m/min, concentration of metal ions 20g/L；
G. double-phase stainless steel coil in f is subjected to desalted water washing, temperature 45 C, washing speed 30m/min；
H. the 309S austenite stainless coil of strips of double-phase stainless steel coil front-end and back-end are cut away, you can obtain double-phase stainless steel coil
Finished product, surface gloss is high, and stablizes without black stripe defect, width and thickness（Fig. 2）, reached 2205 two phase stainless steels
Quality requirement.
Embodiment 3
The present embodiment annealing and pickling is cold rolling hard state 2205 two phase stainless steel coil of strip of the thickness for 1.5mm, including following
Step：
A. 310S austenite stainless coil of strips are connected respectively in double-phase stainless steel coil front-end and back-end；
B. process speed is set as 40m/min, and it is 60 to obtain TV values, and it is as shown in table 4 below to set each area's temperature according to TV values：
The fire box temperature in each area during the two phase stainless steel annealing that 4 TV values of table are 60（℃）
C. the stainless-steel roll after annealing is subjected to Na2SO4Electrolysis, Na2SO4Gravity 1.15g/cm3, 75 DEG C of temperature, pH
It is 4 to be worth, Faradaic current 200A/cm2, electrolytic speed 30m/min；
D. double-phase stainless steel coil in c is continued into HNO3Electrolysis, HNO3Solution concentration is 150g/L, and temperature 60 C is electrolysed
Electric current 200A/cm2, electrolytic speed 30m/min；
E. double-phase stainless steel coil in d is scrubbed using scrubbing unit, scrubbing unit electric current is 1.8A；
F. the double-phase stainless steel coil after being scrubbed in e is subjected to nitration mixture pickling, pickling medium HNO3+ HF, 58 DEG C of temperature, HNO3
Concentration 170g/L, HF concentration 45g/L, pickling speed 10m/min, concentration of metal ions 15g/L；
G. double-phase stainless steel coil in f is subjected to desalted water washing, temperature 60 C, washing speed 10m/min；
H. the 310S austenite stainless coil of strips of double-phase stainless steel coil front-end and back-end are cut away, you can obtain double-phase stainless steel coil
Finished product, surface gloss is high, and stablizes without black stripe defect, width and thickness（Fig. 2）, reached 2205 two phase stainless steels
Quality requirement.
Claims (2)
1. a kind of cold rolled annealed acid cleaning process of two phase stainless steel, it is characterised in that：Include the following steps：
A. it is connected respectively in double-phase stainless steel coil front-end and back-end stainless similar in annealing temperature and two phase stainless steel annealing temperature
Coil of strip；
B. process speed is set as 30-40m/min, according to double-phase stainless steel coil thickness and process speed, calculates TV values；Then
The annealing operation of double-phase stainless steel coil in the fire box temperature progress a of each annealed zone is set according to TV values；
C. the double-phase stainless steel coil after annealing is subjected to Na2SO4Electrolysis, Na2SO4The proportion of solution is 1.15-1.20g/cm3, temperature
65-75 DEG C of degree, pH value 3-5；Faradaic current 100-200A/cm2, electrolytic speed 10-30m/min；
D. double-phase stainless steel coil in c is continued into HNO3Electrolysis, HNO3A concentration of 110-150g/L of solution, temperature 55-60
℃；Faradaic current 100-200A/cm2, 10-30m/min of electrolytic speed；
E. double-phase stainless steel coil in d is scrubbed；
F. the double-phase stainless steel coil after being scrubbed in e is subjected to nitration mixture pickling, acid washing conditions are：Pickling medium HNO3+ HF, temperature 55-
60 DEG C, HNO3Concentration 140-170g/L, HF concentration 35-45g/L；Concentration of metal ions ＜ 30g/L, pickling speed 20-30m/
min；
G. double-phase stainless steel coil in f is washed, washing conditions are：Wash medium desalted water, 45-60 DEG C of temperature, washing speed
Spend 10-30m/min；
H. the stainless-steel roll for cutting away the connection of double-phase stainless steel coil front-end and back-end obtains double-phase stainless steel coil finished product；
The two phase stainless steel is 2205 two phase stainless steel of cold rolling.
2. a kind of cold rolled annealed acid cleaning process of two phase stainless steel according to claim 1, it is characterised in that：It is adopted in step e
The scrub of double-phase stainless steel coil is carried out with scrubbing unit, scrub electric current is 0.5-1.8A.
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| CN107142513B (en) * | 2017-05-09 | 2019-04-16 | 张家港浦项不锈钢有限公司 | High chrome high-nickel stainless-steel cold-rolling annealing and pickling technique |
| CN108977874B (en) * | 2018-09-18 | 2021-01-26 | 浦项(张家港)不锈钢股份有限公司 | Annealing and pickling method for duplex stainless steel |
| CN110814032B (en) * | 2019-10-18 | 2021-11-19 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Cold rolling method for 2B surface 439 ferritic stainless steel |
| CN111057935B (en) * | 2019-12-25 | 2021-04-02 | 浦项(张家港)不锈钢股份有限公司 | Preparation method of heat-resistant stainless steel |
| CN112323075A (en) * | 2020-09-28 | 2021-02-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Solid solution pickling process for S32750 super duplex stainless steel medium plate |
| CN114045378A (en) * | 2021-10-18 | 2022-02-15 | 山西太钢不锈钢股份有限公司 | Method for improving surface cleanliness of heat-resistant steel |
| CN114086188A (en) * | 2021-10-18 | 2022-02-25 | 山西太钢不锈钢股份有限公司 | Method for improving pickling effect of stainless steel of wide and thick cold plate |
| CN115287419A (en) * | 2022-07-20 | 2022-11-04 | 山西太钢不锈钢股份有限公司 | Annealing and pickling process method of high-temperature-resistant austenitic stainless steel cold-rolled strip steel |
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