CN109530434B - Cold rolling system of stainless steel strip - Google Patents
Cold rolling system of stainless steel strip Download PDFInfo
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- CN109530434B CN109530434B CN201811510018.0A CN201811510018A CN109530434B CN 109530434 B CN109530434 B CN 109530434B CN 201811510018 A CN201811510018 A CN 201811510018A CN 109530434 B CN109530434 B CN 109530434B
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- 238000005097 cold rolling Methods 0.000 title claims abstract description 400
- 239000010935 stainless steel Substances 0.000 title claims abstract description 123
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 123
- 238000003466 welding Methods 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims description 91
- 239000000839 emulsion Substances 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 23
- 239000010731 rolling oil Substances 0.000 claims description 14
- 238000000137 annealing Methods 0.000 claims description 7
- 230000008093 supporting effect Effects 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims 6
- 239000007788 liquid Substances 0.000 claims 1
- 238000010924 continuous production Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 9
- 238000005461 lubrication Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 229910001566 austenite Inorganic materials 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005237 degreasing agent Methods 0.000 description 1
- 239000013527 degreasing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
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- 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
- B21B1/24—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 in a continuous or semi-continuous process
- B21B1/28—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 in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/06—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged vertically, e.g. edgers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
-
- 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
- B21B37/48—Tension control; Compression control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a cold rolling system of a stainless steel strip, which comprises a feeding device, an inlet loop connected with the feeding device, a laser welding machine connected with the inlet loop, a first cold rolling machine connected with the laser welding machine, a second cold rolling machine connected with the first cold rolling machine, a third cold rolling machine connected with the second cold rolling machine, a fourth cold rolling machine connected with the third cold rolling machine, a fifth cold rolling machine connected with the fourth cold rolling machine, a sixth cold rolling machine connected with the fifth cold rolling machine, a cleaning machine connected with the sixth cold rolling machine, and an outlet loop connected with the cleaning machine. The invention has reasonable structure, saves space, can realize continuous production, has good mechanical property of the rolled finished product, wide thickness range of 0.2-4 mm, small roughness and bright and high-grade appearance.
Description
Technical Field
The invention relates to the technical field of stainless steel, in particular to a cold rolling system of a stainless steel belt.
Background
The stainless steel strip is an extension of an ultrathin stainless steel plate, is mainly a narrow and long steel plate which is produced by meeting the requirements of different industrial departments for industrial production of various metal or mechanical products, is widely applied to high-technology industry, IT industry and aerospace industry, has high added value, but is difficult to master in rolling process, because internal stress can be generated in the stainless steel strip after primary rolling, the finish rolling effect is influenced, the forming of finished products is also greatly influenced, the requirements of different finished products on hardness are different, the rolling process difficulty is increased, the production efficiency is low, and the yield is not high.
Moreover, the thickness range of the stainless steel strip produced by the prior art is narrower, and the common thickness is 0.5-2.0mm, so that the requirements of different processing fields on the stainless steel strip with different thickness cannot be met. In addition, the stainless steel band produced by the prior art has larger roughness, so that the surface is dull and the grade is not high. And the larger roughness also affects the surface quality of the stainless steel belt.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a cold rolling system of a stainless steel strip, which has reasonable structure, saves space, can realize continuous production, has good mechanical property of a rolled finished product, has wide thickness range of 0.2-4 mm, small roughness and bright and high-grade appearance.
In order to solve the above problems, the present invention provides a cold rolling system of a stainless steel strip, comprising:
the feeding device is used for winding the stainless steel strip blank with the thickness of 1.0-6.0 mm;
the laser welding machine is connected with the feeding device and is used for carrying out laser welding on stainless steel strip blanks of different rolls;
an inlet loop connected with the laser welding machine;
the first cold rolling mill is connected with the inlet loop and is used for carrying out first cold rolling on the stainless steel strip blank;
the second cold rolling mill is connected with the first cold rolling mill and is used for carrying out second-pass cold rolling on the stainless steel strip blank subjected to the first-pass cold rolling;
the third cold rolling mill is connected with the second cold rolling mill and is used for carrying out third cold rolling on the stainless steel strip blank subjected to the second-pass cold rolling;
the fourth cold rolling mill is connected with the third cold rolling mill and is used for carrying out fourth-pass cold rolling on the stainless steel strip blank subjected to the third-pass cold rolling;
a fifth cold rolling mill connected with the fourth cold rolling mill and used for carrying out a fifth pass cold rolling on the stainless steel strip blank subjected to the fourth pass cold rolling;
a sixth cold rolling mill connected with the fifth cold rolling mill, and used for carrying out sixth-pass cold rolling on the stainless steel strip blank subjected to the fifth-pass cold rolling;
the cleaning machine is connected with the sixth cold rolling mill and is used for cleaning the stainless steel strip blank subjected to the sixth-pass cold rolling;
an outlet loop connected with the cleaning machine;
the stainless steel strip blank is subjected to material input through a feeding device and an inlet loop, cold rolling treatment is performed through a laser welding machine, a first cold rolling machine, a second cold rolling machine, a third cold rolling machine, a fourth cold rolling machine, a fifth cold rolling machine, a sixth cold rolling machine and a cleaning machine, and is output through the outlet loop, and then the stainless steel strip blank is subjected to drying, cleaning, annealing, electrolysis, acid washing and withdrawal leveling to obtain a stainless steel strip finished product with the thickness of 0.2-4 mm.
As an improvement of the above scheme, the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill and the sixth cold rolling mill are arranged in series and used for rolling stainless steel strips with different thicknesses at one time.
As an improvement of the scheme, the cold rolling mill comprises a working roll for performing cold rolling treatment, a middle roll arranged above or below the working roll, a support roll arranged above or below the middle roll and a side support roll arranged on the side edge of the working roll;
the diameter of the working roller is smaller than that of the middle roller, and the diameter of the middle roller is smaller than that of the supporting roller.
As an improvement of the scheme, the side support roller comprises three side support sub-rollers which are arranged in a triangle;
the first side supporting sub-roller is attached to the middle roller and the working roller, the second side supporting sub-roller is attached to the middle roller only, and the third side supporting sub-roller is not attached to the middle roller and the working roller.
As improvement of the scheme, emulsion feeding devices are arranged in the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill and the sixth cold rolling mill, the emulsion feeding devices apply emulsion to the radial direction of the working rolls, the emulsion comprises 95-98% of water and 2-5% of rolling oil, and the flow rate of the emulsion is 2900-5500L/min.
As an improvement of the scheme, the viscosity of the rolling oil is 600-800mm 2 And/s, the sum of the reduction rates of six-pass cold rolling is 70-80% at maximum.
As an improvement of the scheme, the tension at the inlet of the first cold rolling mill is 240-260 KN, the tension at the outlet of the first cold rolling mill is 490-650 KN, the rolling force of the first cold rolling mill is 9600-9800 KN, the rolling speed of the first cold rolling mill is 60-110 m/min, and the flow rate of the emulsion of the first cold rolling mill is 3100-4200L/min;
the tension at the outlet of the second cold rolling mill is 440-700 KN, the rolling force of the second cold rolling mill is 10000-11000 KN, the rolling speed of the second cold rolling mill is 80-150 m/min, and the flow rate of the emulsion of the second cold rolling mill is 3000-4100L/min;
the tension at the outlet of the third cold rolling mill is 390-650 KN, the rolling force of the third cold rolling mill is 9400-9600 KN, the rolling speed of the third cold rolling mill is 90-220 m/min, and the flow rate of emulsion of the third cold rolling mill is 3200-4300L/min;
the tension at the outlet of the fourth cold rolling mill is 340-600 KN, the rolling force of the fourth cold rolling mill is 9100-9350 KN, the rolling speed of the fourth cold rolling mill is 110-280 m/min, and the flow rate of emulsion of the fourth cold rolling mill is 2900-4000L/min;
the tension at the outlet of the fifth cold rolling mill is 310-560 KN, the rolling force of the fifth cold rolling mill is 8900-9100 KN, the rolling speed of the fifth cold rolling mill is 120-310 m/min, and the flow rate of emulsion of the fifth cold rolling mill is 3300-4400L/min;
the tension at the outlet of the sixth cold rolling mill is 230-500 KN, the rolling force of the sixth cold rolling mill is 8700-9000 KN, the rolling speed of the sixth cold rolling mill is 130-400 m/min, and the flow rate of emulsion of the sixth cold rolling mill is 3250-4350L/min.
As an improvement of the above-mentioned solution, the inlet loop and the outlet loop are at least six layers of large loops, and the at least six layers of large loops are arranged along the vertical direction;
the tension of the inlet loop is 40-50 KN, and the tension of the outlet loop is 20-50 KN.
As an improvement of the scheme, an automatic thickness control system and a plate type control system are arranged in the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill and the sixth cold rolling mill and are used for controlling the thickness and the plate type of the stainless steel strip.
As an improvement of the scheme, the stainless steel band finished product comprises the following components in percentage by weight:
0.01 to 0.05 percent of C, 6.0 to 9.5 percent of Ni, 16.5 to 20.0 percent of Cr, 0.1 to 3.0 percent of Mn, 0.01 to 0.2 percent of Cu, 0.15 to 1.0 percent of Si, 0.01 to 0.2 percent of P, 0.01 to 0.1 percent of S, 0.02 to 0.15 percent of N, and the balance of Fe and unavoidable impurities.
The implementation of the invention has the following beneficial effects:
the invention provides a cold rolling system of a stainless steel strip, which comprises a feeding device, an inlet loop, a laser welding machine, a first cold rolling mill, a second cold rolling mill, a third cold rolling mill, a fourth cold rolling mill, a fifth cold rolling mill, a sixth cold rolling mill, a cleaning machine and an outlet loop, wherein the equipment is less, the structure is reasonable, the space is saved, the continuous production of the stainless steel strip can be realized, the production efficiency is high, and the cold rolling system is concretely as follows:
(1) The cold rolling system can perform cold rolling treatment on stainless steel strip blanks with the thickness of 1.0-6.0 mm, and the cold rolling treatment is full continuous stainless steel six-continuous rolling, so that the production efficiency is high, the yield is high, the production cost per ton of steel is low, and the cold rolling system has the advantages of high yield, high efficiency, energy conservation, environmental protection and the like.
(2) The cold rolling process is fully continuous six-continuous rolling, does not need to be alternated with an annealing process in the middle, eliminates internal stress generated after primary rolling by precisely controlling the process parameters of six-pass cold rolling, improves the mechanical property of a finished product, obtains the stainless steel strip finished product with the thickness of 0.2-4 mm and the 2B mirror effect, has bright and high-grade appearance and wide thickness range, and meets the requirements of different processing industries on stainless steel strips with different thicknesses.
(3) The stainless steel band product of the invention has good mechanical property, the yield strength is 300-350MPa, the tensile strength is 700-750MPa, the stretching rate is 50-70%, and the hardness is 160-180HV.
(4) According to the invention, by matching the viscosity of the rolling oil and the rolling reduction of six-pass cold rolling, the oil film thickness is reduced by reducing the viscosity of the rolling oil and improving the rolling reduction of the cold rolling, the phenomenon of plastic roughening of the surface of the stainless steel after rolling is avoided, and the surface roughness of the stainless steel strip is reduced, so that good appearance effect and higher surface quality are obtained.
(5) The cold rolling process is provided with the laser welding machine, so that the welding quality and the welding speed can be ensured, the continuous production of a production line is facilitated, and the yield of the steel strip is improved.
(6) The inlet and the outlet of the invention are respectively provided with the inlet loop and the outlet loop, and the loops are six layers of large loops, so that the production space can be greatly saved, the continuous operation of the unit is ensured, and the continuous production is realized.
Drawings
FIG. 1 is a schematic view of a cold rolling system for a stainless steel strip of the present invention;
FIG. 2 is a schematic view of a six pass cold rolling mill of the present invention;
FIG. 3 is a schematic view of a first cold rolling mill of the present invention;
FIG. 4 is a schematic view of the working state of the emulsion of the present invention;
fig. 5 is a schematic view of a work roll of the present invention.
Detailed Description
The present invention will be described in further detail below for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1, the cold rolling system of a stainless steel strip provided by the invention comprises:
the feeding device 1 is used for winding stainless steel strip blanks with the diameter of 1.0-6.0 mm;
the laser welding machine 2 is connected with the feeding device 1 and is used for carrying out laser welding on stainless steel strip blanks of different rolls;
an inlet loop 3 connected to the laser welder 2;
a first cold rolling mill 4 connected to the inlet loopers 3 for performing a first cold rolling of the stainless steel strip stock;
a second cold rolling mill 5 connected with the first cold rolling mill 4, for performing a second pass cold rolling on the stainless steel strip blank after the first pass cold rolling;
a third cold rolling mill 6 connected to the second cold rolling mill 5, for performing a third cold rolling of the stainless steel strip blank after the second cold rolling pass;
a fourth cold rolling mill 7 connected with the third cold rolling mill 6, for performing a fourth cold rolling on the stainless steel strip blank after the third cold rolling;
a fifth cold rolling mill 8 connected with the fourth cold rolling mill 7, for performing a fifth cold rolling on the stainless steel strip blank after the fourth cold rolling;
a sixth cold rolling mill 9 connected to the fifth cold rolling mill 8, for performing a sixth cold rolling of the stainless steel strip blank after the fifth cold rolling;
a cleaning machine 10 connected to the sixth cold rolling mill 9 for cleaning the stainless steel strip blank after the sixth pass cold rolling;
an outlet looper 11 connected to the washer 10;
the stainless steel strip blank is subjected to material input through a feeding device 1, a laser welding machine 2 and an inlet loop 3, is subjected to cold rolling treatment through a first cold rolling mill 4, a second cold rolling mill 5, a third cold rolling mill 6, a fourth cold rolling mill 7, a fifth cold rolling mill 8, a sixth cold rolling mill 9 and a cleaning machine 10, is output through an outlet loop 11, and is subjected to drying, cleaning, annealing, electrolysis, acid washing and withdrawal leveling to obtain a stainless steel strip finished product with the thickness of 0.2-4 mm.
The first cold rolling mill 4, the second cold rolling mill 5, the third cold rolling mill 6, the fourth cold rolling mill 7, the fifth cold rolling mill 8 and the sixth cold rolling mill 9 are arranged in series and used for rolling stainless steel strips with different thicknesses at one time.
With reference to fig. 1, the inlet loop 3 is at least six layers of large loops, and the at least six layers of large loops are arranged along the vertical direction, and have the function of storing and maintaining a certain strip steel amount in the running process of the unit so as to ensure the strip steel running speed of the process section. When the inlet loop is in normal operation, enough loop quantity is maintained to be put when the inlet section equipment is in decelerating operation or is stopped, so that the operation speed of the process section is ensured to be constant.
The outlet loop 11 is at least six layers of large loops, the at least six layers of large loops are arranged along the vertical direction, and the outlet loop is arranged at the outlet of the unit and is used for storing a certain loop strip steel amount in the coiling and stopping process so as to ensure the strip steel running speed of the rolling mill section. The outlet loop maintains a small loop amount when the unit is operating normally.
Therefore, the inlet loop 3 and the outlet loop 11 improve the space utilization rate of a production workshop, ensure continuous operation of a unit and realize continuous production. The tension of the inlet loop 3 is 40-50 KN, and the tension of the outlet loop 11 is 20-50 KN, so that stable transmission of the stainless steel belt can be ensured.
As shown in fig. 2 and 3, the first cold rolling mill 4, the second cold rolling mill 5, the third cold rolling mill 6, the fourth cold rolling mill 7, the fifth cold rolling mill 8, and the sixth cold rolling mill 9 each include a work roll for performing a cold rolling process, an intermediate roll provided above or below the work roll, a backup roll provided above or below the intermediate roll, and a side backup roll provided on a side of the work roll. Taking the first cold rolling mill 4 as an example, it includes a work roll 41 for performing a cold rolling process, an intermediate roll 42 provided above or below the work roll 41, a backup roll 43 provided above or below the intermediate roll 42, and a side backup roll 44 provided on the side of the work roll 41. Preferably, the diameter of the working roller 41 is smaller than the diameter of the intermediate roller 42, and the diameter of the intermediate roller 42 is smaller than the diameter of the support roller 43. The diameter of the side backup roll 44 is close to that of the work roll 41, so that the cold rolling effect of the cold rolling mill can be ensured, the rolling reduction can be improved, and the stability in the cold rolling process can be ensured.
The side support rollers 44 comprise three side support sub-rollers which are arranged in a triangle shape; wherein, the first side support sub-roller 44A is in contact with the work roller 41 and is not in contact with the intermediate roller 42, the second side support sub-roller 44B is in contact with the first side support sub-roller 44A and is not in contact with the intermediate roller 42, and the third side support sub-roller 44C is in contact with the first side support sub-roller 44A and is not in contact with the second side support sub-roller 44B. The structural design of the side supporting roller can ensure good supporting effect and uniformity of rolling oil distribution in the cold rolling process.
In order to obtain a good lubricating effect and ensure stable operation of the system, emulsion feeding devices are arranged in the first cold rolling mill 4, the second cold rolling mill 5, the third cold rolling mill 6, the fourth cold rolling mill 7, the fifth cold rolling mill 8 and the sixth cold rolling mill 9, emulsion is applied to the radial direction of the working rolls by the emulsion feeding devices, the emulsion comprises 95-98% of water and 2-5% of rolling oil, and the flow rate of the emulsion is 2900-5500L/min.
Preferably, the emulsion comprises 97% of water and 3% of rolling oil, the emulsion with the concentration has good lubricating and cooling effects in cooperation with the rolling speed in the cold rolling process and the thickness difference of stainless steel, the lubrication and cooling are ensured to be uniform and sufficient, the temperature balance in the cold rolling process is realized, the stability of a system is improved, and the failure probability of equipment is reduced.
As shown in fig. 4, rolling oil enters from the gap between the work rolls 41, then flows out from the gap between the work rolls 41 and the side support rolls 44, lubricates the intermediate rolls 42, and then enters the gap between the intermediate rolls 42 and the support rolls 43, thereby achieving the overall lubrication of the cold rolling mill and ensuring the sufficiency and uniformity of the lubrication thereof.
As a more preferable embodiment of the invention, the viscosity of the rolling oil is 600-800mm in the six-pass cold rolling process 2 And/s. The sum of the reduction rates of six passes of cold rolling is 70-80% at maximum. The temperature of the emulsion is 43-55 ℃.
According to the invention, by matching the viscosity of the rolling oil and the rolling reduction of six-pass cold rolling, the rolling reduction of the cold rolling is improved by reducing the viscosity of the rolling oil, and meanwhile, the oil film thickness is reduced by matching the temperature of the emulsion, the phenomenon of plastic roughening of the surface of the stainless steel after rolling is avoided, and the surface roughness of the stainless steel strip is reduced, so that good appearance effect and higher surface quality are obtained. The roughness of the stainless steel strip finished product is as low as 0.15-0.25 mu m through matching the viscosity of the rolling oil and the reduction rate of six-pass cold rolling.
As shown in fig. 5, along the axial direction of the work roll 41, the inside of the work roll is spirally arranged with pressure sensors 45 for realizing piezomagnetic control. The pressure sensors arranged in a spiral way can monitor the plate shape of the stainless steel belt in real time without dead angles, so that the technological parameters of the cold rolling process are adjusted, and the good plate shape is ensured to be obtained.
Further, the invention precisely controls the technological parameters of six-pass cold rolling through fully continuous six-continuous rolling without intervening an annealing process, eliminates the internal stress generated after primary rolling and improves the mechanical properties of the finished product, and the invention specifically comprises the following steps:
(A) Carrying out first cold rolling on the stainless steel strip blank subjected to laser welding by a first cold rolling mill 4;
the tension at the inlet of the first cold rolling mill is 240-260 KN, the tension at the outlet of the first cold rolling mill is 490-650 KN, the rolling force of the first cold rolling mill is 9600-9800 KN, the rolling speed of the first cold rolling mill is 60-110 m/min, and the flow of the emulsion of the first cold rolling mill is 3100-4200L/min.
The inlet and the outlet of the first cold rolling mill adopt smaller tension, and the stainless steel strip blank is subjected to first cold rolling treatment by adopting lower rolling force and lower rolling speed during the first cold rolling. The rolling reduction rate of the first-pass cold rolling is 25-33%, so that a good rolling effect can be achieved, and rolling difficulty caused by high rolling reduction rate of the first-pass cold rolling is avoided. And the flow of the emulsion for the first cold rolling is 3100-4200L/min, which is used for matching the rolling speed and the rolling reduction of the first cold rolling, so as to realize good lubrication and temperature balance control.
(B) Carrying out second-pass cold rolling on the stainless steel strip blank subjected to the first-pass cold rolling through a second cold rolling mill 5;
the tension at the outlet of the second cold rolling mill is 440-700 KN, the rolling force of the second cold rolling mill is 10000-11000 KN, the rolling speed of the second cold rolling mill is 80-150 m/min, and the flow of the emulsion of the second cold rolling mill is 3000-4100L/min. The reduction rate of the second-pass cold rolling is 30-35%.
The second-pass cold rolling of the second cold rolling mill is a key point of forming, and in the six-pass cold rolling process, the maximum rolling force and the second slow rolling speed are adopted, so that the internal stress generated in the stainless steel strip after primary rolling can be removed by 60%, the plate shape of the stainless steel strip is effectively improved, the hardness is improved, and the mechanical property of the stainless steel strip is improved. The flow of the emulsion for the second-pass cold rolling is 3000-4100L/min, and the emulsion is used for matching the rolling speed and the rolling reduction of the second-pass cold rolling, so that good lubrication and temperature balance control are realized.
(C) Cold rolling the stainless steel strip blank subjected to the second-pass cold rolling for a third time through a third cold rolling mill 6;
the tension at the outlet of the third cold rolling mill is 390-650 KN, the rolling force of the third cold rolling mill is 9400-9600 KN, the rolling speed of the third cold rolling mill is 90-220 m/min, and the flow of the emulsion of the third cold rolling mill is 3200-4300L/min. The rolling reduction of the third cold rolling may be set in accordance with the rolling reduction of the fourth to sixth cold rolling. The flow of emulsion for the third cold rolling is 3200-4300L/min, and the emulsion is used for matching the rolling speed and the rolling reduction of the third cold rolling, so that good lubrication and temperature balance control are realized.
(D) The stainless steel strip blank after the third cold rolling is subjected to a fourth cold rolling by a fourth cold rolling mill 7;
the tension at the outlet of the fourth cold rolling mill is 340-600 KN, the rolling force of the fourth cold rolling mill is 9100-9350 KN, the rolling speed of the fourth cold rolling mill is 110-280 m/min, and the flow rate of emulsion of the fourth cold rolling mill is 2900-4000L/min. The rolling reduction of the fourth pass cold rolling may be set in accordance with the rolling reduction of the third and fifth to sixth passes. The flow of the emulsion for the fourth-pass cold rolling is 2900-4000L/min, and the emulsion is used for matching the rolling speed and the rolling reduction of the fourth-pass cold rolling, so that good lubrication and temperature balance control are realized.
(E) Carrying out fifth-pass cold rolling on the stainless steel strip blank subjected to the fourth-pass cold rolling through a fifth cold rolling mill 8;
the tension at the outlet of the fifth cold rolling mill is 310-560 KN, the rolling force of the fifth cold rolling mill is 8900-9100 KN, the rolling speed of the fifth cold rolling mill is 120-310 m/min, and the flow rate of emulsion of the fifth cold rolling mill is 3300-4400L/min. The reduction ratio of the fifth pass cold rolling may be set in accordance with the reduction ratios of the third, fourth and sixth passes. The flow of emulsion for the fifth-pass cold rolling is 3300-4400L/min, and the emulsion is used for matching the rolling speed and the rolling reduction of the fifth-pass cold rolling, so that good lubrication and temperature balance control are realized.
(F) Carrying out sixth-pass cold rolling on the stainless steel strip blank subjected to the fifth-pass cold rolling through a sixth cold rolling mill 9;
the tension at the outlet of the sixth cold rolling mill is 230-500 KN, the rolling force of the sixth cold rolling mill is 8700-9000 KN, the rolling speed of the sixth cold rolling mill is 130-400 m/min, and the flow rate of emulsion of the sixth cold rolling mill is 3250-4350L/min. The reduction ratio of the sixth pass cold rolling may be set in accordance with the reduction ratios of the third, fourth and fifth passes. The flow rate of the emulsion for the sixth-pass cold rolling is 3250-4350L/min, and the emulsion is used for matching the rolling speed and the rolling reduction rate of the sixth-pass cold rolling, so that good lubrication and temperature balance control are realized.
The third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill and the sixth cold rolling mill respectively perform third-pass cold rolling, fourth-pass cold rolling, fifth-pass cold rolling and sixth-pass cold rolling, wherein the third-pass cold rolling, the fourth-pass cold rolling, the fifth-pass cold rolling and the sixth-pass cold rolling gradually reduce the tension and the rolling force, and simultaneously improve the rolling speed, so that the internal stress generated in the stainless steel strip is completely removed in a divided manner. The sum of the rolling reduction rates after six passes of cold rolling is 70-80% at maximum.
The first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill and the sixth cold rolling mill are arranged in series and are used for rolling stainless steel strips with different thicknesses at one time. The first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill and the sixth cold rolling mill realize full continuous six continuous rolling, an alternate annealing process is not needed in the middle, the internal stress generated after primary rolling is eliminated by precisely controlling the technological parameters of six-pass cold rolling, the mechanical property of a finished product is improved, the thickness of the finished product is 0.2-4 mm, the stainless steel strip finished product with a 2B mirror effect is obtained, the appearance is high-grade, the thickness range is wide, and the requirements of different industries on stainless steel strips with different thicknesses are met. In addition, the full-continuous six-continuous rolling process has the advantages of high production efficiency, high yield, low production cost of ton steel, high yield, high efficiency, energy conservation, environmental protection and the like.
Further, an automatic thickness control system and a plate type control system are arranged in the first cold rolling mill 4, the second cold rolling mill 5, the third cold rolling mill 6, the fourth cold rolling mill 7, the fifth cold rolling mill 8 and the sixth cold rolling mill 9 and are used for controlling the thickness and the plate type of the stainless steel strip.
The washer 10 includes a brush and employs a specialized alkaline degreasing agent, which is brushed at a temperature of about 80 degrees to remove surface soil.
The stainless steel strip blank is input through a feeding device 1 and an inlet loop 3, cold-rolled through a laser welding machine 2, a first cold-rolling mill 4, a second cold-rolling mill 5, a third cold-rolling mill 6, a fourth cold-rolling mill 7, a fifth cold-rolling mill 8, a sixth cold-rolling mill 9 and a cleaning machine 10, and is output through an outlet loop 11, and then dried, cleaned, annealed, electrolyzed, pickled and pulled and leveled to obtain a stainless steel strip finished product with the thickness of 0.2-4 mm.
The stainless steel band finished product comprises the following components in percentage by weight:
0.01 to 0.05 percent of C, 6.0 to 9.5 percent of Ni, 16.5 to 20.0 percent of Cr, 0.1 to 3.0 percent of Mn, 0.01 to 0.2 percent of Cu, 0.15 to 1.0 percent of Si, 0.01 to 0.2 percent of P, 0.01 to 0.1 percent of S, 0.02 to 0.15 percent of N, and the balance of Fe and unavoidable impurities.
Specifically, 0.01 to 0.05 percent of C and 0.15 to 1.0 percent of Si can promote the formation of austenite and stabilize the austenite structure, can improve the strength of stainless steel, can obtain good forming performance, and is suitable for cold rolling technology. And 0.1 to 3.0 percent of Mn and 6.0 to 9.5 percent of Ni are matched, so that austenite can be stabilized, the mechanical property of the stainless steel belt can be improved, the forming property of the stainless steel belt can be improved, the cold rolling process is suitable, and a foundation is laid for obtaining good plate shape subsequently. The stainless steel strip contains 16.5 to 20.0 percent of Cr, so that the stainless steel strip has good corrosion resistance. The alloy contains 0.02-0.15% of N, can stabilize austenite, and is beneficial to improving the strength and corrosion resistance of the stainless steel belt. Cu is 0.01-0.2%, which can reduce the austenitic phase fault energy and improve the plasticity and the forming performance of the stainless steel strip.
Preferably, the stainless steel strip finished product prepared by the cold rolling system comprises the following components in percentage by weight:
0.03 to 0.04 percent of C, 7.0 to 9.0 percent of Ni, 17.5 to 19.0 percent of Cr, 0.5 to 2.0 percent of Mn, 0.02 to 0.08 percent of Cu, 0.40 to 0.80 percent of Si, 0.02 to 0.05 percent of P, 0.01 to 0.05 percent of S, 0.02 to 0.06 percent of N, and the balance of Fe and unavoidable impurities.
The mechanical properties of the stainless steel band finished product are as follows:
| project | Numerical value |
| Yield strength of | 300-350MPa |
| Tensile strength of | 700-750MPa |
| Stretch ratio | 50-70％ |
| Hardness of | 160-180HV |
| Surface roughness | 0.15-0.25μm |
The invention is further illustrated by the following examples
The cold rolling system of the invention carries out cold rolling treatment of stainless steel according to the following procedures:
selecting stainless steel strip blanks with preset thickness;
coiling the stainless steel strip blank;
carrying out laser welding on the stainless steel strip blanks of different rolls by a laser welding machine on the stainless steel strip blanks after being coiled;
transmitting the stainless steel strip blank subjected to laser welding to a first cold rolling mill through an inlet loop for first cold rolling;
carrying out second-pass cold rolling on the stainless steel strip blank subjected to the first-pass cold rolling through a second cold rolling mill;
cold rolling the stainless steel strip blank subjected to the second-pass cold rolling for a third time through a third cold rolling mill;
carrying out a fourth cold rolling on the stainless steel strip blank subjected to the third cold rolling by a fourth cold rolling mill;
carrying out fifth-pass cold rolling on the stainless steel strip blank subjected to the fourth-pass cold rolling through a fifth cold rolling mill;
carrying out sixth-pass cold rolling on the stainless steel strip blank subjected to the fifth-pass cold rolling through a sixth cold rolling mill;
cleaning the stainless steel strip blank subjected to the sixth-pass cold rolling;
and (3) conveying the cleaned stainless steel strip blank to the next working procedure through an outlet loop, and drying, cleaning, annealing, electrolyzing, pickling, and leveling to obtain a stainless steel strip finished product.
(II) the working parameters of the cold rolling system of each embodiment are as follows:
and (III) the performance of the finished stainless steel belt is as follows:
in conclusion, the fully continuous six continuous rolling can improve the mechanical properties of the finished product, the yield strength is 300-350MPa, the tensile strength is 700-750MPa, the elongation is 50-70%, the hardness is 160-180HV, the stainless steel strip finished product with the thickness of 0.2-4 mm and the 2B mirror effect is obtained, the appearance is bright and high-grade, the thickness range is wide, and the requirements of different processing industries on stainless steel strips with different thicknesses are met.
The above disclosure is only a preferred embodiment of the present invention, and it is needless to say that the scope of the invention is not limited thereto, and therefore, the equivalent changes according to the claims of the present invention still fall within the scope of the present invention.
Claims (6)
1. A cold rolling system for stainless steel strip, comprising:
the feeding device is used for winding the stainless steel strip blank with the thickness of 1.0-6.0 mm;
the laser welding machine is connected with the feeding device and is used for carrying out laser welding on stainless steel strip blanks of different rolls;
an inlet loop connected with the laser welding machine;
the first cold rolling mill is connected with the inlet loop and is used for carrying out first cold rolling on the stainless steel strip blank;
the second cold rolling mill is connected with the first cold rolling mill and is used for carrying out second-pass cold rolling on the stainless steel strip blank subjected to the first-pass cold rolling;
the third cold rolling mill is connected with the second cold rolling mill and is used for carrying out third cold rolling on the stainless steel strip blank subjected to the second-pass cold rolling;
the fourth cold rolling mill is connected with the third cold rolling mill and is used for carrying out fourth-pass cold rolling on the stainless steel strip blank subjected to the third-pass cold rolling;
a fifth cold rolling mill connected with the fourth cold rolling mill and used for carrying out a fifth pass cold rolling on the stainless steel strip blank subjected to the fourth pass cold rolling;
a sixth cold rolling mill connected with the fifth cold rolling mill, and used for carrying out sixth-pass cold rolling on the stainless steel strip blank subjected to the fifth-pass cold rolling;
the cleaning machine is connected with the sixth cold rolling mill and is used for cleaning the stainless steel strip blank subjected to the sixth-pass cold rolling;
an outlet loop connected with the cleaning machine;
emulsion feeding devices are arranged in the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill and the sixth cold rolling mill, and the emulsion is formedThe liquid feeding device applies emulsion to the radial direction of the working roller, wherein the emulsion comprises 95-98% of water and 2-5% of rolling oil, the flow of the emulsion is 2900-5500L/min, and the viscosity of the rolling oil is 600-800mm 2 /s；
The stainless steel strip blank is subjected to material input through a feeding device and an inlet loop, cold rolling treatment is performed through a laser welding machine, a first cold rolling mill, a second cold rolling mill, a third cold rolling mill, a fourth cold rolling mill, a fifth cold rolling mill, a sixth cold rolling mill and a cleaning machine, and is output through the outlet loop, and then the stainless steel strip blank is subjected to drying, cleaning, annealing, electrolysis, acid washing and withdrawal leveling to obtain a stainless steel strip finished product with the thickness of 0.2-4 mm;
the tension at the inlet of the first cold rolling mill is 240-260 KN, the tension at the outlet of the first cold rolling mill is 490-650 KN, the rolling force of the first cold rolling mill is 9600-9800 KN, the rolling speed of the first cold rolling mill is 60-110 m/min, and the flow rate of emulsion of the first cold rolling mill is 3100-4200L/min;
the tension at the outlet of the second cold rolling mill is 440-700 KN, the rolling force of the second cold rolling mill is 10000-11000 KN, the rolling speed of the second cold rolling mill is 80-150 m/min, and the flow rate of the emulsion of the second cold rolling mill is 3000-4100L/min;
the tension at the outlet of the third cold rolling mill is 390-650 KN, the rolling force of the third cold rolling mill is 9400-9600 KN, the rolling speed of the third cold rolling mill is 90-220 m/min, and the flow rate of emulsion of the third cold rolling mill is 3200-4300L/min;
the tension at the outlet of the fourth cold rolling mill is 340-600 KN, the rolling force of the fourth cold rolling mill is 9100-9350 KN, the rolling speed of the fourth cold rolling mill is 110-280 m/min, and the flow rate of emulsion of the fourth cold rolling mill is 2900-4000L/min;
the tension at the outlet of the fifth cold rolling mill is 310-560 KN, the rolling force of the fifth cold rolling mill is 8900-9100 KN, the rolling speed of the fifth cold rolling mill is 120-310 m/min, and the flow rate of emulsion of the fifth cold rolling mill is 3300-4400L/min;
the tension at the outlet of the sixth cold rolling mill is 230-500 KN, the rolling force of the sixth cold rolling mill is 8700-9000 KN, the rolling speed of the sixth cold rolling mill is 130-400 m/min, and the flow rate of emulsion of the sixth cold rolling mill is 3250-4350L/min;
the sum of the rolling reduction rates of six passes of cold rolling is 70-80% at maximum;
the inlet loop and the outlet loop are at least six layers of large loops, and the at least six layers of large loops are arranged along the vertical direction;
the tension of the inlet loop is 40-50 KN, and the tension of the outlet loop is 20-50 KN.
2. The cold rolling system of stainless steel strip according to claim 1, wherein the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill, and the sixth cold rolling mill are arranged in series for rolling stainless steel strips of different thicknesses at a time.
3. The cold rolling system of stainless steel strip according to claim 1, wherein each of the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill, and the sixth cold rolling mill includes a work roll for performing a cold rolling process, an intermediate roll provided above or below the work roll, a backup roll provided above or below the intermediate roll, and a side backup roll provided at a side of the work roll;
the diameter of the working roller is smaller than that of the middle roller, and the diameter of the middle roller is smaller than that of the supporting roller.
4. The cold rolling system of stainless steel strip according to claim 3, wherein the side support rolls comprise three side support sub-rolls, the three side support sub-rolls being arranged in a triangle;
wherein, first side support branch roller and work roll laminating and with middle roller non-laminating, second side support branch roller and first side support branch roller laminating and with middle roller non-laminating, third side support branch roller and first side support branch roller laminating and with second side support branch roller non-laminating.
5. The cold rolling system of the stainless steel strip according to claim 1, wherein the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill and the sixth cold rolling mill are provided with an automatic thickness control system and a plate type control system for controlling the thickness and the plate type of the stainless steel strip.
6. The cold rolling system of stainless steel strip according to claim 1, wherein the stainless steel strip comprises the following components in percentage by weight:
0.01 to 0.05 percent of C, 6.0 to 9.5 percent of Ni, 16.5 to 20.0 percent of Cr, 0.1 to 3.0 percent of Mn, 0.01 to 0.2 percent of Cu, 0.15 to 1.0 percent of Si, 0.01 to 0.2 percent of P, 0.01 to 0.1 percent of S, 0.02 to 0.15 percent of N, and the balance of Fe and unavoidable impurities.
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