CN110819877B - Method for producing ultra-pure ferrite stainless steel for decoration by using steckel mill - Google Patents
Method for producing ultra-pure ferrite stainless steel for decoration by using steckel mill Download PDFInfo
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses a method for producing a decorative ultrapure ferrite stainless steel by using a steckel mill, belongs to the field of stainless steel production, and solves the problem of surface texture defects existing in the ultrapure ferrite stainless steel rolled by the steckel mill. The invention comprises the following steps: smelting and continuous casting; grinding; heating in a heating furnace; hot rolling and rough rolling; hot rolling and finish rolling; hot rolling and curling; carrying out thermal annealing and pickling; cold rolling; cold annealing and acid pickling; and (7) flattening. Aiming at the characteristics of the steckel mill, the invention adopts reasonable rolling temperature, rolling schedule and proper low thermal annealing temperature to eliminate oriented grain clusters in the microstructure of the cold-rolled product in the traditional process, so as to obtain the microstructure with randomly dispersed grain orientation, further effectively eliminate the defect of rolling direction plate grains on the macroscopic surface of the cold-rolled 2B product, and ensure that the product is qualified after being ground and drawn.
Description
Technical Field
The invention belongs to the field of stainless steel production, and particularly relates to a method for producing decorative ultrapure ferrite stainless steel by using a steckel mill.
Background
The ultra-pure ferritic stainless steel SUS443J1 has excellent corrosion resistance due to the extremely low C, N content and the addition of a certain amount of stabilizing elements Ti and Nb; the components of the alloy do not contain noble metal Ni, so that the production cost is greatly reduced. SUS443J1 is widely used in the field of architectural decoration because of its economical efficiency and high corrosion resistance. The decoration field has strict requirements on the surface defects of products, and the popularization and the application of the products are limited when the defects that wire drawing cannot be processed or needs to be processed for multiple times exist on the surface. The steckel mill can keep the temperature of the plate blank when the plate blank is rolled in a reciprocating way due to the heating furnaces arranged at the two sides of the reversing mill, and the steckel mill is particularly suitable for rolling stainless steel which is easy to generate edge cracks. In addition, the steckel mill also has the advantages of less investment, small occupied area and the like. However, the steckel mill has low rolling speed, long high-temperature retention time of strip steel and low thermal deformation energy storage, and the final cold-rolled product of the ferritic stainless steel with high chromium content is easy to have a wrinkling phenomenon which is macroscopically represented by strip-shaped plate line defects along the rolling direction, and the plate line defects can be eliminated by drawing for multiple times, thereby seriously influencing the use of downstream customers.
At present, the production method of stainless steel for decoration mainly adjusts steel-making components and cold rolling process to achieve the purpose of good surface, the method for rolling stainless steel by using a steckel mill mainly focuses on preventing hot rolling edge crack, and the influence of the wrinkling defect of the high-chromium ferritic stainless steel rolled by the steckel mill on decoration application is not considered. Therefore, the production process related to the invention mainly aims to improve the 'wrinkling' defect of the SUS443J1 ultrapure ferritic stainless steel rolled by the steckel mill, so as to improve the grinding performance of the SUS443J1 ultrapure ferritic stainless steel.
Disclosure of Invention
The invention aims to provide a method for producing a decorative ultrapure ferritic stainless steel by using a steckel mill, which aims to solve the problem of surface texture defects of an ultrapure ferritic stainless steel SUS443J1 rolled by the steckel mill.
In order to solve the problems, the invention adopts the technical scheme that: a method for producing ultrapure ferritic stainless steel for decoration by adopting a steckel mill comprises the following steps:
A. smelting and continuously casting the plate blank according to the conventional process of a VOD-LF refining furnace;
B. b, carrying out full grinding treatment on the plate blank obtained in the step A;
C. b, heating the ground plate blank obtained in the step B to 750-800 ℃ in a preheating furnace, then entering a heating furnace to continuously heat to 1160-1200 ℃, and heating for 210-240 min;
D. c, rolling the heated plate blank obtained in the step C into an intermediate blank by adopting 7-pass rough rolling, controlling the rolling speed of the last pass to be less than or equal to 2.5m/min, adding high-pressure water for descaling at the rough rolling inlets of the first two passes and the last two passes, and increasing the swing residence time of the intermediate blank after rough rolling for 10-15 s so as to further reduce the finish rolling temperature;
E. d, rolling the intermediate blank obtained after rough rolling in the step D by a 7-pass steckel mill, wherein the finish rolling start temperature is less than or equal to 930 ℃, the finish rolling temperature is less than or equal to 830 ℃, and rolling is carried out to obtain a black coil;
F. e, curling the finish-rolled black coil obtained in the step E, wherein the curling temperature is 550-650 ℃, and preparing the SUS443J1 hot-rolled black coil;
G. rolling the hot-rolled black coil obtained in the step F by a six-roller rolling mill, wherein the rolling reduction rate is 15-25%, then annealing and pickling by a thermal annealing and pickling line, wherein the annealing temperature is 900-950 ℃, and thus a No.1 product is prepared;
H. rolling the product No.1 obtained in the step G in a cold rolling twenty-high mill to a target thickness to prepare a hard rolling product;
I. c, annealing and pickling the rolled hard product obtained in the step H in a cold annealing and pickling line to prepare a 2D product;
J. and (4) flattening and glazing the 2D product obtained in the step I by using a flattening machine to improve the plate shape, and preparing the final 2B cold-rolled product.
As a further improvement of the invention, in step a, the slab components are: c: less than or equal to 0.015 percent, Si: less than or equal to 0.40 percent, Mn: less than or equal to 0.40 percent, P: less than or equal to 0.030 percent, S: less than or equal to 0.0030 percent, Ni: less than or equal to 0.30 percent, Cr: 20.50-22.00%, Cu: 0.30 to 0.50%, Nb: 0.10-0.16%, Ti: 0.12-0.30%, N: less than or equal to 0.015 percent, and the balance of Fe and residual elements.
As a further improvement of the invention, in the step A, the thickness of the slab is 220mm, the width is 1250mm, and the length is 8000-.
As a further improvement of the invention, in the step B, the full grinding treatment is firstly ground twice by a 16# grinding wheel, the grinding depth is 2.0-2.5 mm, and then ground once by a 20# grinding wheel, and the grinding depth is 0.5-1.0 mm.
As a further improvement of the invention, in the step D, the thickness of the intermediate blank is 28-31 mm.
As a further improvement of the invention, in the step G, the pickling is performed by using sulfuric acid for pre-pickling and then using nitric acid and hydrofluoric acid mixed acid for pickling.
Compared with the prior art, the invention has the following advantages:
1. aiming at the characteristics of the steckel mill, the invention adopts reasonable rolling temperature, rolling schedule and proper low thermal annealing temperature to eliminate oriented grain clusters in the microstructure of the cold-rolled product in the traditional process, so as to obtain the microstructure with randomly dispersed grain orientation, further effectively eliminate the defect of plate lines along the rolling direction on the macroscopic surface of the cold-rolled 2B product, and ensure that the product is qualified after grinding and wire drawing treatment;
2. according to the invention, high-pressure water is added for dephosphorization in the first two times and the second two times before and after rough rolling, the rolling speed of the last pass of rough rolling is controlled to be less than or equal to 2.5m/min, and the swinging retention time of the intermediate billet after rough rolling is increased, so that the rolling rhythm is delayed, the finish rolling temperature is reduced, and the roller sticking defect does not occur in the rough rolling stage;
3. the finish rolling temperature is less than or equal to 930 ℃ and less than or equal to 830 ℃, and is 30-50 ℃ lower than that of the conventional process, and roll sticking defects do not occur; the low finish rolling temperature of the invention can weaken the crystal grain cluster of the cold-rolled annealed plate and eliminate the defect of the grain of the cold-rolled 2B product surface along the rolling direction due to the uneven deformation of the crystal grains with different orientations;
4. according to the invention, the six-roller rolling mill for hot rolling black rolls is added for rolling, and after the six-roller rolling mill rolls, the deformation energy storage of the strip steel is increased, so that the recrystallization degree of the hot rolled plate is promoted, the crystal grain cluster of the cold rolled annealed plate is weakened, and the defect of the plate grain along the rolling direction on the surface of the cold rolled 2B product is eliminated;
5. the thermal annealing temperature of the invention is 900-950 ℃, which is 30-50 ℃ lower than that of the conventional process, and the proper low annealing temperature can thin the crystal grains of the No.1 product, weaken the crystal grain cluster of the cold-rolled annealed plate and eliminate the defect of the rolling direction plate grains on the surface of the cold-rolled 2B product under the condition of ensuring complete recrystallization.
Drawings
FIG. 1 is a macro photograph of a SUS443J1 cold rolled 2B product produced by a conventional process;
FIG. 2 is a macro photograph of a SUS443J1 cold rolled 2B product produced in example 1 of the present invention;
FIG. 3 is a graph showing the grain orientation distribution of a SUS443J1 cold-rolled 2B product produced by a conventional process;
FIG. 4 is a grain orientation distribution diagram of a SUS443J1 cold-rolled 2B product produced in example 1 of the present invention.
Detailed Description
The following examples further illustrate the invention but are not intended to limit the invention in any way.
Because the steckel mill has the advantages of less investment, small occupied area, better edge crack improving effect and the like, the steckel mill is adopted in part of hot rolling procedures of a steel mill. However, the steckel mill has low rolling speed, long high-temperature retention time of strip steel and low thermal deformation energy storage, and the final cold-rolled product of the ferritic stainless steel with high chromium content is easy to have a wrinkling phenomenon and macroscopically shows the defect of strip-shaped plate lines along the rolling direction. The hot rolling equipment used by the applicant is a steckel mill, and the applicant researches a method for producing the decorative ultra-pure ferritic stainless steel by adopting the steckel mill by continuously adjusting the process according to the characteristics of the equipment, so that the surface texture defect of a SUS443J1 cold-rolled finished product is eliminated.
Embodiment 1, a method for producing a decorative ultrapure ferritic stainless steel using a steckel mill, characterized by comprising the steps of:
A. smelting and continuous casting: smelting and continuously casting an SUS443J1 slab according to the conventional process of a VOD-LF refining furnace, wherein the specification is as follows: 220mm (thickness) x 1250mm (width) x 9000mm (length), which comprises the following components in percentage by mass: c: 0.015%, Si: 0.30%, Mn: 0.40%, P: 0.02%, S: 0.003%, Ni: 0.25%, Cr: 21.5%, Cu: 0.5%, Nb: 0.1%, Ti: 0.3%, N: 0.010 percent, and the balance of Fe and residual elements;
B. grinding: b, grinding the plate blank obtained in the step A twice by using a 16# grinding wheel, wherein the grinding depth is 2.3mm, and grinding once by using a 20# grinding wheel, and the grinding depth is 1.0 mm;
C. heating by a heating furnace: b, heating the polished plate blank obtained in the step B to 800 ℃ in a preheating furnace, then putting the polished plate blank into a heating furnace, and continuously heating to 1160 ℃ for 240 min;
D. hot rolling and rough rolling: c, rolling the heated plate blank obtained in the step C into an intermediate blank by adopting 7-pass rough rolling, wherein the thickness of the intermediate blank is 30mm, the rolling speed of the last pass is controlled to be 2.5m/min, high-pressure water is added to the rough rolling inlets of the first two passes and the last two passes for descaling, the swing residence time of the intermediate blank is increased after rough rolling, and the swing lasts for 12 s;
E. hot rolling and finish rolling: d, carrying out 7-pass steckel mill rolling on the intermediate blank obtained after rough rolling in the step D, wherein the finish rolling start temperature is 920 ℃, the finish rolling temperature is 830 ℃, and the rolling is 5.0mm thick black rolls;
F. hot rolling and curling: e, curling the finish-rolled black coil obtained in the step E, wherein the curling temperature is 650 ℃, and preparing a SUS443J1 hot-rolled black coil with the thickness of 5.0 mm;
G. thermal annealing and pickling: rolling the hot-rolled black coil obtained in the step F by a six-roller rolling mill, controlling the reduction rate at 25%, annealing and pickling by a thermal annealing and pickling line after rolling, wherein the annealing temperature is 950 ℃, the pickling is performed by pre-pickling with sulfuric acid, and then pickling with nitric acid and hydrofluoric acid mixed acid, the concentration of the sulfuric acid is 300g/l, the concentration of the nitric acid is 80g/l, and the concentration of the hydrofluoric acid is 30g/l, and rolling, annealing and pickling are performed to prepare a No.1 product (No. 1 refers to the surface grade of stainless steel);
H. cold rolling: rolling the product No.1 obtained in the step G into a rolling hard product with the specification of 1.5mm in a cold rolling twenty-high roll mill;
I. cold annealing and pickling: annealing and pickling the rolled hard product obtained in the step H in a cold annealing and pickling line to prepare a 2D product, wherein the annealing temperature is 950 ℃, and the pickling is carried out by adopting neutral salt electrolysis and mixed acid pickling, wherein the neutral salt is sodium sulfate and has the concentration of 200g/l, the mixed acid is nitric acid and hydrofluoric acid, the concentration of the nitric acid is 120g/l, and the concentration of the hydrofluoric acid is 15 g/l;
J. leveling: and (4) flattening the 2D product obtained in the step I by using a flattening machine to achieve the purpose of improving the plate shape by polishing, and finally preparing a 2B product with the surface free of plate grain defects and the specification of 1.5 mm.
FIG. 1 is a macro photograph of a SUS443J1 cold rolled 2B product produced by a conventional process, and a streak-like wrinkle defect in the rolling direction is evident from FIG. 1; FIG. 2 is a macro photograph of the SUS443J1 cold rolled 2B product produced by this example, and it can be seen from FIG. 2 that the surface is smooth and flat without strip-like "wrinkling" defects. FIG. 3 is a grain orientation distribution diagram of a SUS443J1 cold rolled 2B product produced by a conventional process, and it can be seen from FIG. 3 that clusters of grains having a distinct same orientation are aggregated and the length is along the rolling direction; FIG. 4 is a distribution diagram of the grain orientation of the SUS443J1 cold-rolled 2B product produced by this example, and it can be seen from FIG. 4 that the grain orientation is randomly dispersed and the grain cluster is weak.
Embodiment 2, a method for producing a decorative ultrapure ferritic stainless steel using a steckel mill, characterized by comprising the steps of:
A. smelting and continuous casting: smelting and continuously casting an SUS443J1 slab according to the conventional process of a VOD-LF refining furnace, wherein the specification is as follows: 220mm (thickness) x 1250mm (width) x 8000mm (length), its composition quality percent is: c: 0.010%, Si: 0.40%, Mn: 0.30%, P: 0.03%, S: 0.002%, Ni: 0.3%, Cr: 22.0%, Cu: 0.3%, Nb: 0.16%, Ti: 0.12%, N: 0.015 percent, and the balance of Fe and residual elements;
B. grinding: b, grinding the plate blank obtained in the step A twice by using a 16# grinding wheel, wherein the grinding depth is 2.5mm, and grinding once by using a 20# grinding wheel, and the grinding depth is 0.5 mm;
C. heating by a heating furnace: b, heating the polished plate blank obtained in the step B to 750 ℃ in a preheating furnace, then putting the polished plate blank into a heating furnace, and continuously heating to 1200 ℃ for 210 min;
D. hot rolling and rough rolling: c, rolling the heated plate blank obtained in the step C into an intermediate blank by adopting 7-pass rough rolling, wherein the thickness of the intermediate blank is 31mm, the rolling speed of the last pass is controlled to be 2.5m/min, high-pressure water is added to the rough rolling inlets of the first two passes and the last two passes for descaling, the swing residence time of the intermediate blank is increased after rough rolling, and the swing lasts for 10 s;
E. hot rolling and finish rolling: d, carrying out 7-pass steckel mill rolling on the intermediate blank obtained after rough rolling in the step D, wherein the finish rolling start temperature is 930 ℃, the finish rolling temperature is 830 ℃, and the rolling is 4.75 mm-thick black rolls;
F. hot rolling and curling: e, curling the finish-rolled black coil obtained in the step E, wherein the curling temperature is 550 ℃, and preparing a SUS443J1 hot-rolled black coil with the thickness of 4.75 mm;
G. thermal annealing and pickling: rolling the hot-rolled black coil obtained in the step F by a six-roller rolling mill, controlling the reduction rate at 22%, annealing and pickling by a thermal annealing and pickling line after rolling, wherein the annealing temperature is 920 ℃, the pickling is performed by pre-pickling with sulfuric acid, and then pickling with nitric acid and hydrofluoric acid mixed acid, the concentration of the sulfuric acid is 310g/l, the concentration of the nitric acid is 90g/l, and the concentration of the hydrofluoric acid is 35g/l, and rolling, annealing and pickling are performed to prepare a No.1 product;
H. cold rolling: rolling the product No.1 obtained in the step G into a 1.2 mm-specification rolling hard product in a cold rolling twenty-high roll mill;
I. cold annealing and pickling: annealing and pickling the rolled hard product obtained in the step H in a cold annealing and pickling line to prepare a 2D product, wherein the annealing temperature is 940 ℃, and the pickling is carried out by adopting neutral salt electrolysis and mixed acid pickling, wherein the neutral salt is sodium sulfate and has the concentration of 210g/l, the mixed acid is nitric acid and hydrofluoric acid, the concentration of the nitric acid is 110g/l, and the concentration of the hydrofluoric acid is 14 g/l;
J. leveling: and (4) flattening the 2D product obtained in the step I by using a flattening machine to achieve the purpose of improving the plate shape by polishing, and finally preparing a 2B product with the surface free of plate grain defects and the specification of 1.2 mm.
Embodiment 3, a method for producing a decorative ultrapure ferritic stainless steel using a steckel mill, characterized by comprising the steps of:
A. smelting and continuous casting: smelting and continuously casting an SUS443J1 slab according to the conventional process of a VOD-LF refining furnace, wherein the specification is as follows: 220mm (thickness) x 1250mm (width) x 8500mm (length), which comprises the following components in percentage by mass: c: 0.012%, Si: 0.35%, Mn: 0.20%, P: 0.01%, S: 0.002%, Ni: 0.15%, Cr: 20.5%, Cu: 0.4%, Nb: 0.12%, Ti: 0.18%, N: 0.012%, the balance being Fe and residual elements;
B. grinding: b, grinding the plate blank obtained in the step A twice by using a 16# grinding wheel, wherein the grinding depth is 2.0mm, and grinding once by using a 20# grinding wheel, and the grinding depth is 0.8 mm;
C. heating by a heating furnace: b, heating the polished plate blank obtained in the step B to 780 ℃ in a preheating furnace, then putting the polished plate blank into a heating furnace, and continuously heating to 1180 ℃ for 225 min;
D. hot rolling and rough rolling: c, rolling the heated plate blank obtained in the step C into an intermediate blank by adopting 7-pass rough rolling, wherein the thickness of the intermediate blank is 28mm, the rolling speed of the last pass is controlled to be 2.5m/min, high-pressure water is added to the rough rolling inlets of the first two passes and the last two passes for descaling, the swing residence time of the intermediate blank is increased after rough rolling, and the swing lasts for 15 s;
E. hot rolling and finish rolling: d, carrying out 7-pass steckel mill rolling on the intermediate blank obtained after rough rolling in the step D, wherein the finish rolling start temperature is 930 ℃, the finish rolling temperature is 820 ℃, and the rolling is 4.0mm thick black rolls;
F. hot rolling and curling: e, curling the finish-rolled black coil obtained in the step E, wherein the curling temperature is 600 ℃, and preparing a SUS443J1 hot-rolled black coil with the thickness of 4.0 mm;
G. thermal annealing and pickling: rolling the hot-rolled black coil obtained in the step F by a six-roller rolling mill, controlling the reduction rate at 15%, annealing and pickling by a thermal annealing and pickling line after rolling, wherein the annealing temperature is 900 ℃, the pickling is performed by pre-pickling with sulfuric acid, and then pickling with nitric acid and hydrofluoric acid mixed acid, the concentration of the sulfuric acid is 320g/l, the concentration of the nitric acid is 95g/l, and the concentration of the hydrofluoric acid is 40g/l, and rolling, annealing and pickling are performed to prepare a No.1 product;
H. cold rolling: rolling the product No.1 obtained in the step G into a 1.0 mm-specification rolling hard product in a cold rolling twenty-high roll mill;
I. cold annealing and pickling: annealing and pickling the rolled hard product obtained in the step H in a cold annealing and pickling line to prepare a 2D product, wherein the annealing temperature is 930 ℃, and the pickling is carried out by adopting neutral salt electrolysis and mixed acid pickling, wherein the neutral salt is sodium sulfate and has the concentration of 220g/l, the mixed acid is nitric acid and hydrofluoric acid, the concentration of the nitric acid is 100g/l, and the concentration of the hydrofluoric acid is 16 g/l;
J. leveling: and (4) flattening the 2D product obtained in the step I by using a flattening machine to achieve the purpose of improving the plate shape by polishing, and finally preparing a 2B product with the surface free of plate grain defects and the specification of 1.0 mm.
Claims (5)
1. A method for producing ultrapure ferritic stainless steel for decoration by adopting a steckel mill is characterized by comprising the following steps:
A. smelting and continuously casting a slab according to a VOD-LF refining furnace process, wherein the slab comprises the following components: c: less than or equal to 0.015 percent, Si: less than or equal to 0.40 percent, Mn: less than or equal to 0.40 percent, P: less than or equal to 0.030 percent, S: less than or equal to 0.0030 percent, Ni: less than or equal to 0.30 percent, Cr: 20.50-22.00%, Cu: 0.30 to 0.50%, Nb: 0.10-0.16%, Ti: 0.12-0.30%, N: less than or equal to 0.015 percent, and the balance of Fe and residual elements;
B. b, carrying out full grinding treatment on the plate blank obtained in the step A;
C. b, heating the ground plate blank obtained in the step B to 750-800 ℃ in a preheating furnace, then entering a heating furnace to continuously heat to 1160-1200 ℃, and heating for 210-240 min;
D. c, rolling the heated plate blank obtained in the step C into an intermediate blank by adopting 7-pass rough rolling, controlling the rolling speed of the last pass to be less than or equal to 2.5m/min, adding high-pressure water for descaling at the rough rolling inlets of the first two passes and the last two passes, and adding swing residence time for the intermediate blank after rough rolling, wherein the swing lasts for 10-15 s;
E. d, rolling the intermediate blank obtained after rough rolling in the step D by a 7-pass steckel mill, wherein the finish rolling start temperature is less than or equal to 930 ℃, the finish rolling temperature is less than or equal to 830 ℃, and rolling is carried out to obtain a black coil;
F. e, curling the finish-rolled black coil obtained in the step E, wherein the curling temperature is 550-650 ℃, and preparing the SUS443J1 hot-rolled black coil;
G. rolling the hot-rolled black coil obtained in the step F by a six-roller rolling mill, wherein the rolling reduction rate is 15-25%, and then annealing and pickling in a thermal annealing and pickling line at the annealing temperature of 900-950 ℃ to prepare a No.1 product;
H. rolling the product No.1 obtained in the step G in a cold rolling twenty-high mill to a target thickness to prepare a hard rolling product;
I. c, annealing and pickling the rolled hard product obtained in the step H in a cold annealing and pickling line to prepare a 2D product;
J. and (4) flattening and glazing the 2D product obtained in the step I by using a flattening machine to improve the plate shape, and preparing the final 2B cold-rolled product.
2. The method of producing a decorative ultrapure ferritic stainless steel by means of a steckel mill as claimed in claim 1, wherein: in the step A, the thickness of the slab is 220mm, the width is 1250mm, and the length is 8000-.
3. The method of producing a decorative ultrapure ferritic stainless steel using a steckel mill according to claim 1 or 2, characterized in that: in the step B, the full grinding treatment is carried out by grinding twice with a 16# grinding wheel with the grinding depth of 2.0-2.5 mm and then grinding once with a 20# grinding wheel with the grinding depth of 0.5-1.0 mm.
4. The method of producing a decorative ultrapure ferritic stainless steel by means of a steckel mill as claimed in claim 3, wherein: in the step D, the thickness of the middle blank is 28-31 mm.
5. The method of producing a decorative ultrapure ferritic stainless steel by means of a steckel mill according to claim 4, characterized in that: in the step G, the pickling is performed by using sulfuric acid for pre-pickling and then using nitric acid and hydrofluoric acid mixed acid for pickling.
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| CN112974562B (en) * | 2021-03-31 | 2023-04-07 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Production method of stainless steel hot-rolled coil for welding strip |
| CN113201636A (en) * | 2021-04-21 | 2021-08-03 | 鞍钢联众(广州)不锈钢有限公司 | Method for producing ultrapure ferrite stainless steel by continuous rolling annealing |
| CN113462967B (en) * | 2021-06-19 | 2022-05-17 | 山东盛阳金属科技股份有限公司 | 430 ferrite stainless steel production process |
| CN114082782A (en) * | 2021-11-20 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Anti-wrinkling cold rolling method for 443 ultra-pure ferrite stainless steel |
| CN114433624B (en) * | 2022-01-21 | 2024-07-19 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Cold rolling production method of roughened surface stainless steel |
| CN114686751B (en) * | 2022-04-11 | 2023-05-12 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Brittle failure prevention production method for high-chromium ferrite stainless steel |
| CN115254963B (en) * | 2022-04-11 | 2024-06-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for improving standard-reaching rate of SUS410L stainless steel plate shape |
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