CN114058929A - Efficient rolling method of 400-series stainless steel - Google Patents
Efficient rolling method of 400-series stainless steel Download PDFInfo
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- CN114058929A CN114058929A CN202111362962.8A CN202111362962A CN114058929A CN 114058929 A CN114058929 A CN 114058929A CN 202111362962 A CN202111362962 A CN 202111362962A CN 114058929 A CN114058929 A CN 114058929A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 62
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 39
- 239000010935 stainless steel Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 238000005097 cold rolling Methods 0.000 claims abstract description 15
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 11
- 238000005554 pickling Methods 0.000 claims abstract description 10
- 229910000604 Ferrochrome Inorganic materials 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 238000005098 hot rolling Methods 0.000 claims abstract description 7
- 235000019738 Limestone Nutrition 0.000 claims abstract description 5
- 239000006028 limestone Substances 0.000 claims abstract description 5
- 239000011973 solid acid Substances 0.000 claims abstract description 5
- 239000006104 solid solution Substances 0.000 claims abstract description 5
- 230000009467 reduction Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910000997 High-speed steel Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 229910052759 nickel Inorganic materials 0.000 description 6
- 238000004383 yellowing Methods 0.000 description 3
- 239000010965 430 stainless steel Substances 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- 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
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a high-efficiency rolling method of 400 series stainless steel, which comprises the following steps: 1) dephosphorization of molten iron: dephosphorizing by using limestone, removing slag after dephosphorizing, and pretreating to obtain molten iron P less than or equal to 95 ppm; 2) smelting in a TSR furnace: controlling the adding amount of the high-carbon ferrochrome, and adopting a chamfering crystallizer; 3) rolling of the plate blank: directly carrying out cold rolling without annealing after hot rolling, controlling the finish rolling temperature of a steckel mill to be 1030-1050 ℃, reducing rough rolling passes, and carrying out 5-pass rolling to obtain a black steel strip with the thickness of 3.0 mm; 4) directly conveying the steel strip to a cold rolling mill, and rolling for 5 times to obtain a 1.0mm white steel strip; 5) acid washing: performing solid solution and acid pickling operation at 1210-1220 ℃ in a cold annealing acid pickling furnace to fully dissolve the steel so as to finally obtain a cold-rolled stainless steel product; the invention has high stability of the production process, reduces the production cost, improves the rolling efficiency and improves the quality of stainless steel products.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a high-efficiency rolling method of 400-series stainless steel.
Background
Stainless steel is widely used in tableware, white household appliances, chemical industry, energy, traffic, buildings and other fields because of its unique and good characteristics of corrosion resistance, high temperature resistance and the like. In addition, various high-end stainless steels are widely applied to the industrial fields of petrochemical industry, high pressure of power stations, boilers, nuclear power energy, equipment manufacturing, aerospace, ocean engineering, military industry and the like. The current development situation of the Chinese 400-series ferritic stainless steel is along with the continuous and rapid development of national economy and the improvement of the living standard of people, the apparent consumption of the stainless steel is rapidly increased and accounts for about 25 percent of the total consumption of the world. However, in China, nickel resources are in short supply, the annual output is only 13.5 ten thousand tons, the demand of nickel for stainless steel is as high as 43.9 ten thousand tons, the nickel price mainly depends on import, and in recent years, the nickel price greatly rises, and the proportion of 400 series stainless steel is low, is only 10 percent and is far lower than the level of 30 percent in developed countries, and continuous optimization is needed.
In the aspect of the structure of the consumed steel grade, compared with 300 series stainless steel, the 400 series ferritic stainless steel has the unique characteristics and advantages that the steel does not contain or contains a small amount of nickel, the nickel resource is saved, and the cost is low; the material has the unique properties of low thermal expansion coefficient, good thermal conductivity, excellent stress corrosion resistance, low cold work hardening tendency and the like; the austenitic stainless steel has wide application prospect in the fields of household appliances/electronic industry, kitchen facilities, automobile exhaust systems and the like, and can replace austenitic stainless steel represented by 304 in various fields; but the technical content is high, the production difficulty is high, and the like. Therefore, an efficient rolling method of 400 series stainless steel is urgently needed to be designed, so that the problems of high production difficulty, low stability and high cost of the conventional 400 series stainless steel are solved.
Disclosure of Invention
In view of the problems of the prior art, the present invention aims to provide a high-efficiency rolling method of 400 series stainless steel.
The technical scheme adopted by the invention for solving the technical problems is as follows: a high-efficiency rolling method of 400 series stainless steel comprises the following steps:
1) dephosphorization of molten iron: dephosphorizing by using limestone, removing slag after dephosphorizing, and pretreating to obtain molten iron P less than or equal to 95 ppm;
2) smelting in a TSR furnace: controlling the adding amount of the high-carbon ferrochrome, and adopting a chamfering crystallizer;
3) rolling of the plate blank: directly carrying out cold rolling without annealing after hot rolling, controlling the finish rolling temperature of a steckel mill to be 1030-1050 ℃, reducing rough rolling passes, and carrying out 5-pass rolling to obtain a black steel strip with the thickness of 3.0 mm;
4) directly conveying the steel strip to a cold rolling mill, and rolling for 5 times to obtain a 1.0mm white steel strip;
5) acid washing: and (3) performing solid solution and acid pickling operation at 1210-1220 ℃ in a cold annealing acid pickling furnace to fully dissolve the steel, and finally obtaining the cold-rolled stainless steel product.
Specifically, the 400 series stainless steel comprises the following chemical components in percentage by mass: c: 0.02 to 0.08%, Si: 1.16-1.30%, Mn: 1.33-1.55%, P is less than or equal to 0.035%, S is less than or equal to 0.003%, Cr: 16.3 to 16.6 percent of N, less than or equal to 0.02 percent of N, and the balance of Fe, other alloy components of the 400 system steel and inevitable impurities.
Specifically, in the TSR furnace smelting procedure in the step 2, the adding amount of the high-carbon ferrochrome is controlled to be 25t, the P content of the dephosphorized molten iron is less than 0.009%, and the blowing end point C is as follows: 0.02-0.08%, the reduction time is more than or equal to 7 minutes, and the reduced Cr: 16.3-16.6%, controlling the color of the reduced slag to be white slag, and strictly controlling the content of tapping sulfur which is less than or equal to 0.003%.
Specifically, the width of the slit of the chamfering crystallizer in the step 2 is controlled, and the width of the slit on one side is less than 10 mm.
Specifically, the steckel mill in the step 3 adopts a high-speed steel roll, and the roll changing frequency is reduced.
Specifically, the rolling speed of the cold rolling mill in the step 4 is 8.5-9m/min, and the reduction rate is controlled at 50% -55%.
Specifically, the pickling speed in the step 5 is 40-45m/min, the acceleration is 30-35%, and the surface roughness is less than or equal to 2.5 microns.
The invention has the following beneficial effects:
the invention discloses a high-efficiency rolling method of 400 series stainless steel
(1) The chamfering crystallizer is used in 400 series stainless steel continuous casting first, so that the problems of slit depth and yellowing in the use process are solved, and the width of a slit is reduced to be less than 10mm from 16mm on one side;
(2) the process of direct cold rolling without annealing after hot rolling is a process for researching the influence of hot rolling temperature and deformation on the structure and obtaining high elongation and recrystallized structure;
(3) the rolling process is optimized, the finish rolling temperature is increased by reducing rough rolling passes, the production efficiency is improved, and the roller sticking problem of 430 and the slipping problem of martensitic stainless steel in a finish rolling area are solved;
(4) according to the temperature drop in the steel strip rolling process, the reduction rate of the finish rolling pass is reasonably distributed, and the finish rolling temperature and speed are increased;
(5) the use of the high-speed steel roll on the steckel mill is comprehensively promoted, the roll changing frequency is reduced, and the yield and the surface quality of a steel strip are improved;
(6) the pickling speed is increased from 28m/min to 40-45m/min by controlling the oxide skin structure of the 400 series hot rolled steel strip, the pickling speed is increased by 30-35%, the surface roughness is less than or equal to 2.5 mu m, and the advanced level in the same industry is achieved.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely further detailed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Efficient rolling method of 400-series stainless steel
The first embodiment is as follows: the 430 stainless steel comprises the following chemical components in percentage by mass: c: 0.08%, Si: 1.3%, Mn: 1.55%, P: 0.03%, S: 0.003%, Cr: 16.55%, N: 0.02%, and the balance of Fe, other alloy components of the 400 system steel, and inevitable impurities.
The method comprises the following steps:
1) dephosphorization of molten iron: dephosphorization is carried out by adopting limestone, slagging off is clean after dephosphorization, and after pretreatment, molten iron P: 90 ppm.
2) Smelting in a TSR furnace: controlling the adding amount of the high-carbon ferrochrome, controlling the adding amount of the high-carbon ferrochrome to be 25t in the smelting process of the TSR furnace, controlling the P content of the dephosphorized molten iron to be 0.0085%, and controlling the blowing terminal C: 0.075%, reduction time 7 minutes, Cr: 16.6 percent, controlling the color of the reduced slag to be white slag, and strictly controlling the tapping sulfur content to be 0.003 percent; and a chamfer crystallizer is adopted, so that the problems of slit depth and yellowing in the use process are solved, and the width of the slit is 9 mm.
3) Rolling of the plate blank: and (3) directly carrying out cold rolling without annealing after hot rolling, wherein a high-speed steel roller is adopted by a steckel mill, the roller changing frequency is reduced, the finish rolling temperature of the steckel mill is controlled at 1041 ℃, the rough rolling pass is reduced, and a black steel strip with the thickness of 3.0mm is obtained after 5 passes of rolling.
4) The steel strip is directly sent to a cold rolling mill, and is rolled for 5 times to obtain a white steel strip with the thickness of 1.0mm, the rolling speed of the cold rolling mill is 8.5m/min, and the reduction rate is controlled at 52%.
5) Acid washing: and (3) carrying out solid solution and acid washing operation at the temperature of 1220 ℃ in a cold annealing acid washing furnace to ensure that the stainless steel is fully dissolved, wherein the acid washing speed is 45m/min, the speed is increased by 35 percent, and the surface roughness is 2.4 mu m, thereby finally obtaining the cold-rolled stainless steel product.
The 430 stainless steel produced by the method improves the proportion of hot charging and no repair grinding from 61.4 percent to 94.6 percent, simultaneously adjusts the rough rolling from 7-pass rolling to 5-pass rolling, reduces the load of finish rolling and improves the rolling stability, after the project is stably implemented on 430 steel, the monthly output can be improved to 6 ten thousand tons from 5.2 ten thousand tons at the present stage, and the comprehensive cost of each ton of steel can be reduced by about 15 yuan.
Efficient rolling method of 400-series stainless steel
Example two: the 410S stainless steel comprises the following chemical components in percentage by mass: c: 0.02%, Si: 1.18%, Mn: 1.35%, P: 0.035%, S: 0.003%, Cr: 16.3%, N: 0.02%, and the balance of Fe, other alloy components of the 400 system steel, and inevitable impurities.
The method comprises the following steps:
1) dephosphorization of molten iron: dephosphorization is carried out by adopting limestone, slagging off is clean after dephosphorization, and after pretreatment, molten iron P: 95 ppm.
2) Smelting in a TSR furnace: controlling the adding amount of the high-carbon ferrochrome, controlling the adding amount of the high-carbon ferrochrome to be 25t in the smelting process of the TSR furnace, controlling the P content of the dephosphorized molten iron to be 0.009%, and controlling the blowing end point C: 0.35%, reduction time 7 minutes, after reduction Cr: 16.3 percent, controlling the color of the reduced slag to be white slag, and strictly controlling the tapping sulfur content to be 0.003 percent; and the chamfer crystallizer is adopted, so that the problems of slit depth and yellowing in the use process are solved, and the width of the slit is 8 mm.
3) Rolling of the plate blank: and (3) directly carrying out cold rolling without annealing after hot rolling, wherein a high-speed steel roller is adopted by a steckel mill, the roller changing frequency is reduced, the finish rolling temperature of the steckel mill is controlled at 1047 ℃, the rough rolling pass is reduced, and the black steel strip with the thickness of 3.0mm is obtained after 5 passes of rolling.
4) The steel strip is directly sent to a cold rolling mill, and is rolled for 5 times to obtain a white steel strip with the thickness of 1.0mm, the rolling speed of the cold rolling mill is 9m/min, and the reduction rate is controlled at 55%.
5) Acid washing: and (3) carrying out solid solution and acid washing operation in a cold annealing acid washing furnace at 1217 ℃ to fully dissolve the stainless steel, wherein the acid washing speed is 44m/min, the speed is increased by 34%, and the surface roughness is 2.5 mu m, so that the cold-rolled stainless steel product is finally obtained.
The proportion of hot charging and non-repair grinding of the 410S stainless steel produced by the method is improved from 62.3% to 94.8%, meanwhile, the rough rolling is adjusted from 7-pass rolling to 5-pass rolling, the load of finish rolling is reduced, the rolling stability is improved, after the project is stably implemented on the 410S steel, the monthly output can be improved from 5.5 ten thousand tons in the current stage to 6.2 ten thousand tons, and the comprehensive cost of the steel can be reduced by about 13 yuan.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (7)
1. The high-efficiency rolling method of the 400-series stainless steel is characterized by comprising the following steps of:
1) dephosphorization of molten iron: dephosphorizing by using limestone, removing slag after dephosphorizing, and pretreating to obtain molten iron P less than or equal to 95 ppm;
2) smelting in a TSR furnace: controlling the adding amount of the high-carbon ferrochrome, and adopting a chamfering crystallizer;
3) rolling of the plate blank: directly carrying out cold rolling without annealing after hot rolling, controlling the finish rolling temperature of a steckel mill to be 1030-1050 ℃, reducing rough rolling passes, and carrying out 5-pass rolling to obtain a black steel strip with the thickness of 3.0 mm;
4) directly conveying the steel strip to a cold rolling mill, and rolling for 5 times to obtain a 1.0mm white steel strip;
5) acid washing: and (3) performing solid solution and acid pickling operation at 1210-1220 ℃ in a cold annealing acid pickling furnace to fully dissolve the steel, and finally obtaining the cold-rolled stainless steel product.
2. The efficient rolling method of the 400 series stainless steel according to claim 1, wherein the 400 series stainless steel comprises the following chemical components in percentage by mass: c: 0.02 to 0.08%, Si: 1.16-1.30%, Mn: 1.33-1.55%, P is less than or equal to 0.035%, S is less than or equal to 0.003%, Cr: 16.3 to 16.6 percent of N, less than or equal to 0.02 percent of N, and the balance of Fe, other alloy components of the 400 system steel and inevitable impurities.
3. The method for efficiently rolling 400 series stainless steel according to claim 1, wherein the TSR furnace smelting process in the step 2 controls the adding amount of the high-carbon ferrochrome to be 25t, the dephosphorized molten iron P to be less than 0.009%, and the blowing end point C: 0.02-0.08%, the reduction time is more than or equal to 7 minutes, and the reduced Cr: 16.3-16.6%, controlling the color of the reduced slag to be white slag, and strictly controlling the content of tapping sulfur which is less than or equal to 0.003%.
4. The high-efficiency rolling method of 400 series stainless steel according to claim 1, wherein the chamfer crystallizer in the step 2 controls the slit width, and the slit width of one side is less than 10 mm.
5. The high-efficiency rolling method of 400 series stainless steel according to claim 1, wherein the steckel mill in the step 3 uses high-speed steel rolls and reduces roll change frequency.
6. The high-efficiency rolling method of 400 series stainless steel according to claim 1, wherein the rolling speed of the cold rolling mill in the step 4 is 8.5-9m/min, and the reduction ratio is controlled to 50-55%.
7. The high-efficiency rolling method of 400 series stainless steel according to claim 1, wherein the pickling speed in the step 5 is 40-45m/min, the speed is increased by 30-35%, and the surface roughness is less than or equal to 2.5 μm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3776784A (en) * | 1972-07-14 | 1973-12-04 | Steel Corp | Method of processing stainless steel strips or sheets |
| JP2010037614A (en) * | 2008-08-06 | 2010-02-18 | Sumitomo Metal Ind Ltd | Stainless steel for fuel cell separator and fuel cell separator |
| CN103403205A (en) * | 2011-02-17 | 2013-11-20 | 新日铁住金不锈钢株式会社 | High-purity ferritic stainless steel sheet having excellent oxidation resistance and high-temperature strength, and method for producing same |
| CN111286576A (en) * | 2020-03-26 | 2020-06-16 | 山东泰山钢铁集团有限公司 | Method for producing stainless steel slab by arc chamfering crystallizer continuous casting machine |
| CN113088613A (en) * | 2021-03-31 | 2021-07-09 | 山东泰山钢铁集团有限公司 | Operation method for controlling middle cracks of 400-series stainless steel slab |
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2021
- 2021-11-17 CN CN202111362962.8A patent/CN114058929A/en active Pending
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| US3776784A (en) * | 1972-07-14 | 1973-12-04 | Steel Corp | Method of processing stainless steel strips or sheets |
| JP2010037614A (en) * | 2008-08-06 | 2010-02-18 | Sumitomo Metal Ind Ltd | Stainless steel for fuel cell separator and fuel cell separator |
| CN103403205A (en) * | 2011-02-17 | 2013-11-20 | 新日铁住金不锈钢株式会社 | High-purity ferritic stainless steel sheet having excellent oxidation resistance and high-temperature strength, and method for producing same |
| CN111286576A (en) * | 2020-03-26 | 2020-06-16 | 山东泰山钢铁集团有限公司 | Method for producing stainless steel slab by arc chamfering crystallizer continuous casting machine |
| CN113088613A (en) * | 2021-03-31 | 2021-07-09 | 山东泰山钢铁集团有限公司 | Operation method for controlling middle cracks of 400-series stainless steel slab |
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