CN113462967A - 430 ferrite stainless steel and production process thereof - Google Patents
430 ferrite stainless steel and production process thereof Download PDFInfo
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- CN113462967A CN113462967A CN202110681948.8A CN202110681948A CN113462967A CN 113462967 A CN113462967 A CN 113462967A CN 202110681948 A CN202110681948 A CN 202110681948A CN 113462967 A CN113462967 A CN 113462967A
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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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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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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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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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- 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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- 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
- C21D8/0247—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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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
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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
- C23G1/081—Iron or steel solutions containing H2SO4
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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
- 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
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P10/20—Recycling
Abstract
The invention discloses 430 ferrite stainless steel and a production process thereof, and the production process comprises electric arc furnace heating, AOD furnace heating, refining furnace processing, continuous casting, coping, rolling heating, rough rolling, finish rolling, acid pickling annealing, acid pickling and curling; the rough rolling adopts 7-pass rolling, the plate blank after the rough rolling is sent to a finishing mill group, and the finishing mill group adopts 8 finishing mills of F1-F8, the invention reduces the surface roughness of the rough rolling roller and the pass grinding amount to improve the transmission speed of the billet in the rough rolling process and further improve the temperature of the billet at a rough rolling outlet, so that a thin oxidation layer is attached to the surface of the strip steel in the finishing rolling process, thereby protecting the finishing rolling roller and preventing the scale from being adhered to the roller to generate rough stripes.
Description
Technical Field
The invention belongs to the technical field of ferritic stainless steel production, and particularly relates to 430 ferritic stainless steel and a production process thereof.
Background
430(10Cr17) stainless steel is a general-purpose steel with good corrosion resistance, is widely used for architectural decoration, fuel burner parts, household appliances and household appliance parts, and has the following problems in the production process: in the finish rolling process, the 430 stainless steel has the characteristics of developed columnar crystals, low high-temperature deformation resistance and high surface scale adhesion which are easily adhered to a roller in the hot rolling process due to the characteristics of steel types, so that rough stripes exist on the surface of the strip steel, and the surface quality of the strip steel is influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides 430 ferrite stainless steel and a production process thereof, wherein the surface roughness of a rough rolling roller is reduced, and the pass grinding amount is reduced, so that the transmission speed of a steel billet in the rough rolling process is improved, the temperature of the steel billet at a rough rolling outlet is further improved, a thin oxide layer is attached to the surface of strip steel in the finish rolling process, the finish rolling roller is protected, and the condition that oxide scales are adhered to the roller to generate rough stripes is prevented.
In order to achieve the purpose, the invention adopts the technical scheme that:
430 ferritic stainless steel and a production process thereof, wherein the 430 ferritic stainless steel comprises the following components in percentage by weight: less than or equal to 0.03 percent of C, less than or equal to 0.2 percent of Si, less than or equal to 0.25 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.003 percent of S, less than or equal to 16.2 percent of Cr, less than or equal to 0.2 percent of Ni, less than or equal to 0.03 percent of N, and the balance of Fe and inevitable small impurities.
The production process comprises the following steps:
step 1, heating in an electric arc furnace: sequentially adding 0.03-0.04% of carbon, 0.2-0.4% of silicon, 0.2-0.4% of manganese, 16-18% of chromium and 0.3-0.4% of nickel into each chemical element according to weight percentage, and controlling the temperature of molten steel to be 1500-1550 ℃;
step 2, heating in an AOD furnace: turning the ladle upside down, and tapping at 1600-1650 ℃ at the temperature of more than or equal to 1500 ℃ after slagging off;
step 3, processing of a refining furnace: the charging temperature is 1550-1600 ℃, and the tapping temperature is 1560-1570 ℃;
step 4, continuous casting: the pouring temperature of the middle ladle is 1520-1535 ℃, and the pulling speed is 0.90-0.95 m/min;
step 5, coping: fully peeling the casting blank, and grinding at the temperature of 100-320 ℃;
step 6, rolling and heating: the thickness of the plate blank is 150 mm-170 mm, the temperature of the plate blank in the furnace is controlled to be 220 ℃ to 300 ℃, the temperature of the preheating section is 700 ℃ to 900 ℃, the heating time is controlled to be 45 min-60 min, the preheating section is ended and enters a heating section, the temperature of the first heating section is 1060 ℃ to 1100 ℃, the time is controlled to be 60 min-70 min, the first heating section is ended and enters a second heating section, the temperature of the second heating section is 1160 ℃ to 1180 ℃, the time is controlled to be 65 min-80 min, the temperature of the soaking section is 1175 ℃ to 1185 ℃, the time is controlled to be 30 min-50 min, and the total heating time in the furnace is 200 min-260 min;
step 7, rough rolling: the rough rolling adopts 7-pass rolling, the roughness of upper rollers F1-F3 is controlled to be 0.3-0.9 μm, the roughness of F4-F6 is controlled to be 0.1-0.6 μm, the pass grinding quantity is controlled to be 15-30 μm, the 1 st, 3 rd and 7 th passes of descaling are carried out, the descaling speed is 1.5-2.0 m/s, the first pass reduction is less than or equal to 25.3%, the second pass reduction is controlled to be 25.5-27.3%, the third pass reduction is controlled to be 27.5-29.1%, the fourth pass reduction is controlled to be 25.3-27.6%, the fifth pass reduction is controlled to be 23.2-25.6%, the sixth pass reduction is controlled to be 20.2-23.1%, and the final rolling reduction is 18.1-20.4%;
step 8, finish rolling: and (2) conveying the slab after rough rolling to a finishing mill group, wherein the finishing mill group adopts 8 finishing mills of F1-F8, the steam descaling is used in the finishing rolling, the inlet temperature of the finishing rolling is 1030-1150 ℃, the outlet temperature of the finishing rolling is 960-1050 ℃, and the pressing rate of each pass is respectively controlled as follows: f1: 38.8% -41.2%, F2: 34.5 to 36.6 percent; f3: 32.5% -34.3%, F4: 29.5% -32.5%, F5: 26.1% -28.5%, F6: 20.3% -23.4%, F7: 19.5% -20.5%, F8: 15.5% -16.3%;
step 9, acid pickling annealing: and transferring the opened and welded stainless steel to an acid pickling annealing line, and annealing by adopting step heating, wherein the temperature of a preheating section is less than or equal to 500 ℃, a first heating section, a second heating section and a soaking section are arranged in a step shape at 700-950 ℃, and the tension in the furnace is controlled at 20-35 KN/cm 2.
Step 10, acid washing: the method comprises the steps of annealing a stainless steel strip, then pickling in a pickling line, carrying out acid etching on an oxide skin on the surface of the strip steel by using an electrolytic sodium sulfate solution with the concentration of 150-220 g/t and the temperature of 65-85 ℃, carrying out pickling with sulfuric acid with the concentration of 100-200 g/t and the temperature of 60-80 ℃ to enable the oxide skin on the surface of the strip steel to fall off rapidly, and finally carrying out pickling with mixed acid of nitric acid with the concentration of 100-200 g/t and hydrofluoric acid with the temperature of 20-25 g/t at 40-65 ℃, so that the pickling effect is achieved, the pickling can be carried out layer by layer, the oxide skin is treated more thoroughly, the pickling temperature is heated by a graphite heater, the pickling temperature is not low, the pickling efficiency is reduced while the pickling effect is not ideal due to low temperature of the pickling solution, and the consumption of the pickling solution is increased due to high temperature;
step 11, curling: and (4) curling by a coiler to obtain the hot continuous rolling steel plate coil.
Preferably, step 10, acid washing: the PH value of the electrolytic sodium sulfate solution is controlled to be 2-6, the spraying angle of the electrolytic sodium sulfate solution is 15-45 degrees, the pickling tank is kept clean, the normal operation of the scrubbing machine is kept, and the bristles are reasonable.
Compared with the prior art, the invention has the beneficial effects that:
on the premise of not increasing the heating temperature in the finish rolling process, the roughness of the roller is reduced, the roughness of the roller in the first three times is controlled to be 0.3-0.9 mu m, the roughness of the roller in the second four times is controlled to be 0.1-0.6 mu m, the grinding amount of the roller is reduced, the rough rolling speed is increased, the outlet temperature of the billet in the rough rolling process is further increased, the finish rolling starting temperature is increased, phosphorus is removed through steam in the finish rolling process, the temperature drop of the surface of the strip steel is reduced, meanwhile, a thin oxidation layer is attached to the surface of the strip steel in the finish rolling process, the strip steel is separated from being in direct contact with the roller, and the oxidation layer plays a role in lubrication to a certain extent, so that the roller is protected, the iron scale is prevented from being bonded on the roller, the condition of generating rough stripes is generated, and the surface quality of the strip steel is improved to a great extent.
Detailed Description
For the convenience of understanding of those skilled in the art, the technical solution of the present invention is further specifically described below with reference to examples 1 to 3.
Example 1:
430 ferritic stainless steel and a production process thereof, wherein the 430 ferritic stainless steel comprises the following components in percentage by weight: 0.03% of C, 0.2% of Si, 0.25% of Mn, 0.03% of P, 0.003% of S, 16.2% of Cr, 0.2% of Ni, 0.03% of N, and the balance of Fe and inevitable small amounts of impurities;
step 1, heating in an electric arc furnace: sequentially adding 0.03 percent of carbon, 0.2 percent of silicon, 0.3 percent of manganese, 16 percent of chromium and 0.3 percent of nickel into each chemical element according to the weight percentage, and the balance of low-phosphorus waste steel molten iron and high-carbon ferrochrome molten iron, wherein the temperature of the molten steel is controlled to be 1500-1550 ℃;
step 2, heating in an AOD furnace: turning the ladle upside down, and tapping at 1600-1650 ℃ at the temperature of more than or equal to 1500 ℃ after slagging off;
step 3, processing of a refining furnace: the charging temperature is 1550-1600 ℃, and the tapping temperature is 1560-1570 ℃;
step 4, continuous casting: the pouring temperature of the middle package is 1520 ℃ to 1535 ℃, and the pulling speed is 0.90 m/min;
step 5, coping: fully peeling the casting blank, and grinding at the temperature of 100-320 ℃;
step 6, rolling and heating: the thickness of the plate blank is 150 mm-170 mm, the temperature of the plate blank in the furnace is controlled to be 220 ℃ to 300 ℃, the temperature of the preheating section is controlled to be 700 ℃ to 900 ℃, the heating time is controlled to be 45min, the preheating section is ended and enters a heating section, the temperature of the first heating section is 1060 ℃ to 1100 ℃, the time is controlled to be 60min, the first heating section is ended and enters a second heating section, the temperature of the second heating section is 1160 ℃ to 1180 ℃, the time is controlled to be 65min, the temperature of the soaking section is 1175 ℃ to 1185 ℃, the time is controlled to be 30min, and the total heating time in the furnace is 200 min;
step 7, rough rolling: the rough rolling adopts 7-pass rolling, the roughness of upper rollers F1-F3 is controlled to be 0.3-0.9 μm, the roughness of F4-F6 is controlled to be 0.1-0.6 μm, the pass grinding quantity is controlled to be 15-30 μm, the 1 st, 3 rd and 7 th passes of descaling are carried out, the descaling speed is 1.5-2.0 m/s, the first pass reduction rate is 25.3%, the second pass reduction rate is 25.5%, the third pass reduction rate is 27.5%, the fourth pass reduction rate is 25.3%, the fifth pass reduction rate is 23.2%, the sixth pass reduction rate is 20.2%, and the final pass reduction rate is 18.1%;
step 8, finish rolling: and (2) conveying the slab after rough rolling to a finishing mill group, wherein the finishing mill group adopts 8 finishing mills of F1-F8, the steam descaling is used in the finishing rolling, the inlet temperature of the finishing rolling is 1030-1150 ℃, the outlet temperature of the finishing rolling is 960-1050 ℃, and the pressing rate of each pass is respectively controlled as follows: f1: 38.8%, F2: 34.5 percent; f3: 32.5%, F4: 29.5%, F5: 26.1%, F6: 20.3%, F7: 19.5%, F8: 15.5 percent;
step 9, acid pickling annealing: and transferring the opened and welded stainless steel to an acid pickling annealing line, and annealing by adopting step heating, wherein the temperature of a preheating section is less than or equal to 500 ℃, a first heating section, a second heating section and a soaking section are arranged in a step shape at 700-950 ℃, and the tension in the furnace is controlled at 20-35 KN/cm 2.
Step 10, acid washing: the method comprises the steps of annealing a stainless steel strip, then pickling in a pickling line, carrying out acid etching on an oxide skin on the surface of the strip steel by using an electrolytic sodium sulfate solution with the concentration of 150-220 g/t and the temperature of 65-85 ℃, carrying out pickling with sulfuric acid with the concentration of 100-200 g/t and the temperature of 60-80 ℃ to enable the oxide skin on the surface of the strip steel to fall off rapidly, and finally carrying out pickling with mixed acid of nitric acid with the concentration of 100-200 g/t and hydrofluoric acid with the temperature of 20-25 g/t at 40-65 ℃, so that the pickling effect is achieved, the pickling can be carried out layer by layer, the oxide skin is treated more thoroughly, the pickling temperature is heated by a graphite heater, the pickling temperature is not low, the pickling efficiency is reduced while the pickling effect is not ideal due to low temperature of the pickling solution, and the consumption of the pickling solution is increased due to high temperature;
step 11, curling: and (4) curling by a coiler to obtain the hot continuous rolling steel plate coil.
Example 2:
the difference compared to example 1 is:
step 6, rolling and heating: the thickness of the plate blank is 150 mm-170 mm, the temperature of the plate blank in the furnace is controlled to be 220 ℃ to 300 ℃, the temperature of the preheating section is 700 ℃ to 900 ℃, the heating time is controlled to be 50min, the preheating section is ended and enters a heating section, the temperature of the first heating section is 1060 ℃ to 1100 ℃, the time is controlled to be 65min, the first heating section is ended and enters a second heating section, the temperature of the second heating section is 1160 ℃ to 1180 ℃, the time is controlled to be 70min, the temperature of the soaking section is 1175 ℃ to 1185 ℃, the time is controlled to be 40min, and the total heating time in the furnace is 225 min;
step 7, rough rolling: the rough rolling adopts 7-pass rolling, the roughness of upper rollers F1-F3 is controlled to be 0.3-0.9 μm, the roughness of F4-F6 is controlled to be 0.1-0.6 μm, the pass grinding quantity is controlled to be 15-30 μm, the descaling speed is 1.5-2.0 m/s, the descaling of the 1 st, 3 th and 7 th passes is carried out, the primary reduction rate is 25.3%, the secondary reduction rate is controlled to be 26.3%, the tertiary reduction rate is controlled to be 28.1%, the quaternary reduction rate is controlled to be 26.6%, the quintuple reduction rate is controlled to be 24.6%, the sextuple reduction rate is controlled to be 22.1%, and the final reduction rate is 19.4%;
step 8, finish rolling: and (3) carrying out fine rolling by using steam for descaling, wherein the inlet temperature of the fine rolling is 1030-1150 ℃, the outlet temperature of the fine rolling is 960-1050 ℃, and the reduction rate of each pass is respectively controlled as follows: f1: 40.2%, F2: 35.6 percent; f3: 33.3%, F4: 31.5%, F5: 27.5%, F6: 22.4%, F7: 19.5%, F8: 16.1 percent.
Example 3:
the difference compared to example 1 is:
step 6, rolling and heating: the thickness of the plate blank is 150 mm-170 mm, the temperature of the plate blank in the furnace is controlled to be 220 ℃ to 300 ℃, the temperature of the preheating section is controlled to be 700 ℃ to 900 ℃, the heating time is controlled to be 60min, the preheating section is ended and enters a heating section, the temperature of the first heating section is 1060 ℃ to 1100 ℃, the time is controlled to be 70min, the first heating section is ended and enters a second heating section, the temperature of the second heating section is 1160 ℃ to 1180 ℃, the time is controlled to be 80min, the temperature of the soaking section is 1175 ℃ to 1185 ℃, the time is controlled to be 50min, and the total heating time in the furnace is 260 min;
step 7, rough rolling: the rough rolling adopts 7-pass rolling, the roughness of upper rollers F1-F3 is controlled to be 0.3-0.9 μm, the roughness of F4-F6 is controlled to be 0.1-0.6 μm, the pass grinding quantity is controlled to be 15-30 μm, the descaling speed is 1.5-2.0 m/s, the descaling of the 1 st, 3 th and 7 th passes is carried out, the primary reduction rate is 25.3%, the secondary reduction rate is 27.3%, the tertiary reduction rate is 29.1%, the quaternary reduction rate is 27.6%, the quintuple reduction rate is 25.6%, the sextuple reduction rate is 23.1% and the final reduction rate is 20.4%;
step 8, finish rolling: and (3) carrying out fine rolling by using steam for descaling, wherein the inlet temperature of the fine rolling is 1030-1150 ℃, the outlet temperature of the fine rolling is 960-1050 ℃, and the reduction rate of each pass is respectively controlled as follows: f1: 41.2%, F2: 36.6 percent; f3: 34.3%, F4: 32.5%, F5: 28.5%, F6: 23.4%, F7: 20.5%, F8: 16.3 percent.
Comparative example:
with patent application publication numbers: CN104014588A, a method for producing ferritic stainless steel cold-rolled strip steel, wherein the stainless steel slab is rolled to produce the ferritic stainless steel cold-rolled strip steel with the thickness of 150 mm-170 mm.
Test example:
according to GB/T228.1-2010 part 1 of the tensile test of metallic materials: room temperature test method for the test tests of various examples and comparative examples, the test data are shown in the following table:
according to relevant experimental data, the mechanical properties of the stainless steel strip in the examples 1, 2 and 3 meet relevant regulations in GB/T4237-2015 stainless steel hot-rolled steel plate and strip, and the rolled 430 ferrite stainless steel strip has more excellent properties and better surface quality.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
Claims (5)
1. 430 ferritic stainless steel and a production process thereof are characterized in that the 430 ferritic stainless steel comprises the following components in percentage by weight: less than or equal to 0.03 percent of C, less than or equal to 0.2 percent of Si, less than or equal to 0.25 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.003 percent of S, less than or equal to 16.2 percent of Cr, less than or equal to 0.2 percent of Ni, less than or equal to 0.03 percent of N, and the balance of Fe and inevitable small impurities;
the production process comprises the following steps:
step 1, heating in an electric arc furnace: sequentially adding 0.03-0.04% of carbon, 0.2-0.4% of silicon, 0.2-0.4% of manganese, 16-18% of chromium and 0.3-0.4% of nickel into each chemical element according to weight percentage, and controlling the temperature of molten steel to be 1500-1550 ℃;
step 2, heating in an AOD furnace: turning the ladle upside down, and tapping at 1600-1650 ℃ at the temperature of more than or equal to 1500 ℃ after slagging off;
step 3, processing of a refining furnace: the charging temperature is 1550-1600 ℃, and the tapping temperature is 1560-1570 ℃;
step 4, continuous casting: the pouring temperature of the middle ladle is 1520-1535 ℃, and the pulling speed is 0.90-0.95 m/min;
step 5, coping: fully peeling the casting blank, and grinding at the temperature of 100-320 ℃;
step 6, rolling and heating: the thickness of the plate blank is 150 mm-170 mm, the temperature of the plate blank in the furnace is controlled to be 220 ℃ to 300 ℃, the temperature of the preheating section is 700 ℃ to 900 ℃, the heating time is controlled to be 45 min-60 min, the preheating section is ended and enters a heating section, the temperature of the first heating section is 1060 ℃ to 1100 ℃, the time is controlled to be 60 min-70 min, the first heating section is ended and enters a second heating section, the temperature of the second heating section is 1160 ℃ to 1180 ℃, the time is controlled to be 65 min-80 min, the temperature of the soaking section is 1175 ℃ to 1185 ℃, the time is controlled to be 30 min-50 min, and the total heating time in the furnace is 200 min-260 min;
step 7, rough rolling: the rough rolling adopts 7-pass rolling, the first-pass reduction rate is less than or equal to 25.3 percent, the second-pass reduction rate is controlled to be 25.5 to 27.3 percent, the third-pass reduction rate is controlled to be 27.5 to 29.1 percent, the fourth-pass reduction rate is controlled to be 25.3 to 27.6 percent, the fifth-pass reduction rate is controlled to be 23.2 to 25.6 percent, the sixth-pass reduction rate is controlled to be 20.2 to 23.1 percent, and the final-pass reduction rate is 18.1 to 20.4 percent;
step 8, finish rolling: and (2) conveying the slab after rough rolling to a finishing mill group, wherein the finishing mill group adopts 8 finishing mills of F1-F8, the steam descaling is used in the finishing rolling, the inlet temperature of the finishing rolling is 1030-1150 ℃, the outlet temperature of the finishing rolling is 960-1050 ℃, and the pressing rate of each pass is respectively controlled as follows: f1: 38.8% -41.2%, F2: 34.5 to 36.6 percent; f3: 32.5% -34.3%, F4: 29.5% -32.5%, F5: 26.1% -28.5%, F6: 20.3% -23.4%, F7: 19.5% -20.5%, F8: 15.5% -16.3%;
step 9, acid pickling annealing: transferring the opened and welded stainless steel to an acid pickling annealing line;
step 10, acid washing: the stainless steel strip enters a pickling line for pickling after being annealed;
step 11, curling: and (4) curling by a coiler to obtain the hot continuous rolling steel plate coil.
2. The 430 ferritic stainless steel and the production process thereof according to claim 1 are characterized by the steps of 10, pickling: the method comprises the steps of firstly carrying out acid etching on an oxide skin on the surface of the strip steel by using an electrolytic sodium sulfate solution with the concentration of 150-220 g/t and the temperature of 65-85 ℃, then carrying out acid pickling by using sulfuric acid with the concentration of 100-200 g/t and the temperature of 60-80 ℃ to enable the oxide skin on the surface of the strip steel to rapidly fall off, and finally carrying out acid pickling by using mixed acid with the concentration of 100-200 g/t and the temperature of 20-25 g/t hydrofluoric acid at 40-65 ℃.
3. The 430 ferritic stainless steel and the production process thereof according to claim 1, characterized by the steps of 7, rough rolling: the roughness of the upper machine rollers F1-F3 is controlled to be 0.3-0.9 mu m, the roughness of the upper machine rollers F4-F6 is controlled to be 0.1-0.6 mu m, the pass grinding amount is controlled to be 15-30 mu m, the 1 st, 3 th and 7 th passes of descaling are carried out, and the descaling speed is 1.5-2.0 m/s.
4. The 430 ferritic stainless steel and the production process thereof according to claim 1, characterized by the steps of 9, acid pickling annealing: the annealing is carried out in a stepping mode, wherein the temperature of a preheating section is less than or equal to 500 ℃, a first adding section, a second adding section and a soaking section are arranged in a step shape at 700-950 ℃, and the tension in the furnace is controlled to be 20-35 KN/cm 2.
5. The 430 ferritic stainless steel and the production process thereof according to claim 1 are characterized by the steps of 10, pickling: the PH value of the electrolytic sodium sulfate solution is controlled to be 2-6, the spraying angle of the electrolytic sodium sulfate solution is 15-45 degrees, the pickling tank is kept clean, the normal operation of the scrubbing machine is kept, and the bristles are reasonable.
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Denomination of invention: A Production Process for 430 Ferritic Stainless Steel Effective date of registration: 20230505 Granted publication date: 20220517 Pledgee: Shandong Linyi Luozhuang Rural Commercial Bank Co.,Ltd. Pledgor: SHANDONG SHENGYANG METAL TECHNOLOGY CO.,LTD. Registration number: Y2023980039819 |