CN109530436B - Cold rolling method of stainless steel band and stainless steel band - Google Patents
Cold rolling method of stainless steel band and stainless steel band Download PDFInfo
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- CN109530436B CN109530436B CN201811510864.2A CN201811510864A CN109530436B CN 109530436 B CN109530436 B CN 109530436B CN 201811510864 A CN201811510864 A CN 201811510864A CN 109530436 B CN109530436 B CN 109530436B
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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
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- 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
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- 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
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- 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
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- 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
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- 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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The invention discloses a cold rolling method of a stainless steel strip, which comprises the following steps: coiling the stainless steel strip blank; conveying the stainless steel strip blanks to a laser welding machine, and performing laser welding on different rolls of stainless steel strip blanks; carrying out six times of continuous cold rolling treatment on the stainless steel strip blank by a cold rolling mill; cleaning the stainless steel strip blank; drying, cleaning, annealing, electrolyzing, pickling, straightening and flattening the stainless steel strip blank to obtain a stainless steel strip finished product with the thickness of 0.2-4 mm; the cold rolling mill comprises a working roll, a middle roll, a supporting roll and side supporting rolls, and the working roll is axially arranged, and the inner spiral arrangement of the working roll is provided with a pressure sensor for realizing piezomagnetic control. Correspondingly, the invention also discloses the stainless steel band prepared by the method. By adopting the invention and strictly controlling the rolling process, the rolled finished product has good mechanical property and ideal plate shape.
Description
Technical Field
The invention relates to the technical field of stainless steel, in particular to a cold rolling method of a stainless steel strip and the stainless steel strip.
Background
The stainless steel band is an extension of the ultrathin stainless steel band, mainly a narrow and long steel band produced to meet the needs of different industrial departments for industrially producing various types of metal or mechanical products, is widely applied to high technology industry, IT industry, aviation and aerospace industry, has high added value, but the rolling process is difficult to master, because internal stress can be generated in the stainless steel band after primary rolling, the effect of finish rolling is influenced, the forming of finished products is greatly influenced, different finished products have different requirements on hardness, the difficulty of the rolling process is increased, the production efficiency is low, and the yield is not high.
Moreover, the thickness range of the stainless steel band produced by the prior art is narrow, usually 0.5-2.0mm, and the requirements of different processing fields on stainless steel bands with different thicknesses cannot be met. In addition, the stainless steel strip produced by the prior art has an unsatisfactory plate shape and high roughness, so that the surface is dull and the grade is not high. And the surface quality of the stainless steel strip is affected by the larger roughness.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cold rolling method of a stainless steel band, and by strictly controlling a rolling process, a rolled finished product has good mechanical property, ideal plate shape, wide thickness range which can reach 0.2-4 mm, small roughness and bright and high-grade appearance.
The technical problem to be solved by the invention is to provide a cold rolling method of the stainless steel strip, and the ultrathin stainless steel strip with the thickness as low as 0.2mm can be produced by using a six-pass cold rolling process.
The invention aims to solve the technical problem of providing the stainless steel band which has good mechanical property, wide thickness range which can reach 0.2-4 mm, bright appearance, high grade and ideal plate shape.
In order to solve the above problems, the present invention provides a method for cold rolling a stainless steel strip, comprising:
the selected thickness is as follows: 1.0-6.0 mm stainless steel strip blank;
coiling the stainless steel strip blank;
the rolled stainless steel band blanks are transmitted to a laser welding machine through an inlet loop, and laser welding is carried out on different rolled stainless steel band blanks;
carrying out six times of continuous cold rolling treatment on the stainless steel strip blank subjected to laser welding through a cold rolling mill;
cleaning the stainless steel strip blank subjected to the sixth cold rolling;
conveying the cleaned stainless steel strip blank to the next process through an outlet loop, and drying, cleaning, annealing, electrolyzing, pickling, straightening and flattening to obtain a stainless steel strip finished product with the thickness of 0.2-4 mm;
the cold rolling mill comprises a working roll for cold rolling, a middle roll arranged above or below the working roll, a supporting roll arranged above or below the middle roll and a side supporting roll arranged on the side edge of the working roll, wherein the side supporting roll is arranged along the axis direction of the working roll, and the pressure sensor is arranged in the inner spiral of the working roll and used for realizing piezomagnetic control.
As an improvement of the scheme, the diameter of the working roll is smaller than that of the intermediate roll, and the diameter of the intermediate roll is smaller than that of the supporting roll.
As an improvement of the scheme, the side supporting rollers comprise three side supporting sub-rollers which are arranged in a triangular shape;
wherein, first side supports and divides the roller and the working roll laminating and not laminate with middle roller, and the second side supports and divides the roller laminating and not laminate with middle roller with first side support, and the third side supports and divides the roller laminating and not laminate with second side support with first side support branch roller laminating.
As an improvement of the above scheme, the six-time continuous cold rolling treatment of the laser-welded stainless steel strip blank by a cold rolling mill comprises:
carrying out first cold rolling on the stainless steel strip blank subjected to laser welding through a first cold rolling mill;
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;
carrying out third cold rolling on the stainless steel strip blank subjected to the second cold rolling through a third cold rolling mill;
carrying out fourth cold rolling on the stainless steel strip blank subjected to the third cold rolling through 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 cold rolling on the stainless steel strip blank subjected to the fifth cold rolling through a sixth cold rolling mill;
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 the stainless steel bands with different thicknesses at one time.
As an improvement of the 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 added with rolling oil in the cold rolling process, and the viscosity of the rolling oil is 600-800mm2/s，
The sum of the reduction ratios of six cold rolling passes is 70-80% at most.
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, and the rolling speed of the first cold rolling mill is 60-110 m/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, and the rolling speed of the second cold rolling mill is 80-150 m/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, and the rolling speed of the third cold rolling mill is 90-220 m/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, and the rolling speed of the fourth cold rolling mill is 110-280 m/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, and the rolling speed of the fifth cold rolling mill is 120-310 m/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, and the rolling speed of the sixth cold rolling mill is 130-400 m/min.
As an improvement of the scheme, the finished stainless steel band comprises the following components in percentage by weight:
0.01-0.05% of C, 6.0-9.5% of Ni, 16.5-20.0% of Cr, 0.1-3.0% of Mn, 0.01-0.2% of Cu0.15-1.0% of Si, 0.01-0.2% of P, 0.01-0.1% of S, 0.02-0.15% of N, and the balance of Fe and inevitable impurities.
As an improvement of the scheme, the finished stainless steel strip has the thickness of 0.3-3mm, the yield strength of 300-350MPa, the tensile strength of 700-750MPa, the tensile rate of 50-70%, the hardness of 160-180HV and the surface roughness of 0.15-0.25 mu m.
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.
Correspondingly, the invention also provides a stainless steel strip which is prepared by the cold rolling method, drying, cleaning, annealing, electrolyzing, pickling, straightening and flattening in sequence.
The implementation of the invention has the following beneficial effects:
(1) the cold rolling method for the stainless steel strip, provided by the invention, can be used for carrying out cold rolling treatment on a stainless steel strip blank with the thickness of 1.0-6.0 mm, wherein the cold rolling treatment is full-continuous six-continuous stainless steel rolling, and has the advantages of high production efficiency, high yield, low production cost per ton of steel, high yield, high efficiency, energy conservation, environmental friendliness and the like.
(2) The cold rolling process is full-continuous six-pass rolling, an annealing process is not required to be inserted in the process, the internal stress generated after the initial rolling is eliminated by accurately controlling the technological parameters of the six-pass cold rolling, the mechanical property of the finished product is improved, the finished product of the stainless steel band with the thickness of 0.2-4 mm and the mirror surface effect of 2B is obtained, the appearance is bright and high-grade, the thickness range is wide, and the requirements of different processing industries on stainless steel bands with different thicknesses are met.
(3) The stainless steel strip finished product has good mechanical property, the yield strength is 350-MPa, the tensile strength is 700-750MPa, the tensile rate is 50-70%, and the hardness is 180 HV.
(4) According to the cold rolling process, the pressure sensors are spirally arranged in the working roll along the axial direction of the working roll, so that the piezomagnetic control is realized, and a good plate shape is obtained.
(5) According to the invention, the viscosity of the rolling oil and the reduction rate of six cold rolling passes are matched, the viscosity of the rolling oil is reduced, the reduction rate of the cold rolling is improved, the thickness of an oil film is reduced, the surface plastic roughening phenomenon after stainless steel rolling is avoided, and the surface roughness of a stainless steel band is reduced, so that a good appearance effect and high surface quality are obtained.
(6) 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.
(7) 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, thereby greatly saving the production space, ensuring the continuous operation of the unit and realizing the continuous production.
Drawings
FIG. 1 is a schematic structural view of a cold rolling mill of the present invention;
FIG. 2 is a schematic view of the internal structure of the work roll of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below.
The invention provides a cold rolling method of a stainless steel strip, which comprises the following steps:
(1) the selected thickness is as follows: 1.0-6.0 mm stainless steel strip blank;
(2) coiling the stainless steel strip blank;
(3) the rolled stainless steel band blanks are transmitted to a laser welding machine through an inlet loop, and laser welding is carried out on different rolled stainless steel band blanks;
the inlet loop is at least six layers of large loops, and the at least six layers of large loops are arranged along the vertical direction, so that the space utilization rate of a production workshop is improved, the continuous operation of a unit is ensured, and the continuous production is realized.
(4) Carrying out six times of continuous cold rolling treatment on the stainless steel strip blank subjected to laser welding through a cold rolling mill;
as shown in fig. 1, the cold rolling mill includes a work roll 1 for performing cold rolling treatment, a middle roll 2 disposed above or below the work roll 1, a support roll 3 disposed above or below the middle roll 2, and a side support roll 4 disposed on a side of the work roll 1. Preferably, the diameter of the working roll 1 is smaller than that of the middle roll 2, the diameter of the middle roll 2 is smaller than that of the supporting roll 3, and the diameter of the side supporting roll 4 is close to that of the working roll 1, so that the cold rolling effect of a cold rolling mill can be ensured, the reduction rate is improved, and the stability in the cold rolling process is ensured.
The side supporting rollers 4 comprise three side supporting sub-rollers which are arranged in a triangular shape; wherein, first side supports and divides roller 4A and the laminating of working roll 1 and not laminating with middle roller 2, and the second side supports and divides roller 4B and the laminating of first side support branch roller 4A and not laminating with middle roller 2, and the third side supports and divides roller 4C and the laminating of first side support branch roller 4A and not laminating with second side support branch roller 4B. This structural design of collateral branch supporting roll both can guarantee good supporting effect, also can guarantee the homogeneity that cold rolling in-process rolling oil distributes, and rolling oil gets into from the clearance between the working roll, then flows out from the clearance between working roll and the collateral branch supporting roll, lubricates the middle roller, gets into the clearance between middle roller and the backing roll again to the realization is to the whole lubrication of cold rolling mill, and guarantees its lubricated sufficiency and homogeneity.
As shown in fig. 2, pressure sensors 5 are arranged inside the work roll 1 in a spiral arrangement along the axial direction of the work roll for realizing piezomagnetic control. The pressure sensors arranged in a spiral way can monitor the plate shape of the stainless steel strip in all directions without dead angles in real time, so as to adjust the technological parameters of the cold rolling process and ensure that a good plate shape is obtained.
Specifically, the method for carrying out six times of continuous cold rolling treatment on the stainless steel strip blank subjected to laser welding through a cold rolling mill comprises the following steps:
(A) carrying out first cold rolling on the stainless steel strip blank subjected to laser welding through a first cold rolling mill;
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, and the rolling speed of the first cold rolling mill is 60-110 m/min;
the stainless steel strip blank is subjected to primary cold rolling treatment by adopting smaller tension at an inlet and an outlet of the first cold rolling mill and adopting lower rolling force and lower rolling speed during primary cold rolling. The reduction rate of the first-pass cold rolling is 25-33%, so that a good pressing effect can be achieved, and the difficulty in rolling caused by the high reduction rate of the first-pass cold rolling is avoided.
(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;
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, and the rolling speed of the second cold rolling mill is 80-150 m/min. The reduction rate of the second cold rolling is 30-35%.
The second-pass cold rolling performed by 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.
(C) Carrying out third cold rolling on the stainless steel strip blank subjected to the second cold rolling through a third cold rolling mill;
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, and the rolling speed of the third cold rolling mill is 90-220 m/min.
(D) Carrying out fourth cold rolling on the stainless steel strip blank subjected to the third cold rolling through a fourth cold rolling mill;
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, and the rolling speed of the fourth cold rolling mill is 110-280 m/min.
(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;
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, and the rolling speed of the fifth cold rolling mill is 120-310 m/min.
(F) Carrying out sixth cold rolling on the stainless steel strip blank subjected to the fifth cold rolling through a sixth cold rolling mill;
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, and the rolling speed of the sixth cold rolling mill is 130-400 m/min.
And the third cold rolling mill, the fourth cold rolling mill, the fifth cold rolling mill and the sixth cold rolling mill are respectively subjected to third cold rolling, fourth cold rolling, fifth cold rolling and sixth cold rolling, wherein the third cold rolling, the fourth cold rolling, the fifth cold rolling and the sixth cold rolling gradually reduce the tension, reduce the rolling force and simultaneously improve the rolling speed, so that the internal stress generated in the stainless steel strip is completely removed in several times. The sum of the reduction ratios after six times of cold rolling is 70-80% at most.
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 bands 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 annealing process is not needed to be inserted in the middle, the internal stress generated after primary rolling is eliminated by accurately controlling the technological parameters of six-pass cold rolling, the mechanical property of a finished product is improved, the stainless steel strip finished product with the thickness of 0.2-4 mm and the 2B mirror surface effect is obtained, the appearance is high, the thickness range is wide, and the requirements of different industries on stainless steel strips with different thicknesses are met. Moreover, the full-continuous six-continuous-rolling process has the advantages of high production efficiency, high yield, low production cost per ton of steel, high efficiency, energy conservation, environmental protection and the like.
Further, 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 added with rolling oil in the cold rolling process, and the viscosity of the rolling oil is 600-800mm2And s. The sum of the reduction ratios of six cold rolling passes is 70-80% at most.
According to the invention, the viscosity of the rolling oil and the reduction rate of six cold rolling passes are matched, the viscosity of the rolling oil is reduced, the reduction rate of the cold rolling is improved, the thickness of an oil film is reduced, the surface plastic roughening phenomenon after stainless steel rolling is avoided, and the surface roughness of a stainless steel band is reduced, so that a good appearance effect and high surface quality are obtained. After the viscosity of rolling oil and the reduction rate of six times of cold rolling are matched, the roughness of the finished stainless steel strip is as low as 0.15-0.25 mu m.
(5) Cleaning the stainless steel strip blank subjected to the sixth cold rolling;
the cleaning can adopt a special alkaline degreasing agent, and the special alkaline degreasing agent is brushed by a brush at the temperature of about 80 ℃ and used for removing the surface dirt.
(6) And conveying the cleaned stainless steel strip blank to the next process through an outlet loop, and drying, cleaning, annealing, electrolyzing, pickling, straightening and flattening to obtain a stainless steel strip finished product with the thickness of 0.2-4 mm.
Preferably, the thickness of the finished stainless steel band is 0.3-3 mm.
The outlet loop is at least six layers of large loops which are arranged along the vertical direction. The at least six layers of large sleeves are arranged along the vertical direction, so that the space utilization rate of a production workshop is improved, the continuous operation of a unit is ensured, and the continuous production is realized.
The tension of entry loop is 40 ~ 50KN, the tension of export loop is 20 ~ 50KN, can guarantee the stable transmission of stainless steel band.
Finally, the stainless steel strip finished product prepared by the cold rolling method comprises the following components in percentage by weight:
0.01-0.05% of C, 6.0-9.5% of Ni, 16.5-20.0% of Cr, 0.1-3.0% of Mn, 0.01-0.2% of Cu0.15-1.0% of Si, 0.01-0.2% of P, 0.01-0.1% of S, 0.02-0.15% of N, and the balance of Fe and inevitable impurities.
Specifically, 0.01-0.05% of C and 0.15-1.0% of Si can promote austenite formation, stabilize austenite structure, improve the strength of the stainless steel, obtain good forming performance and be suitable for a cold rolling process. And by matching with Mn0.1-3.0% and Ni 6.0-9.5%, austenite can be stabilized, the mechanical property of the stainless steel band can be improved, the forming property of the stainless steel band can be improved, and the method is suitable for a cold rolling process and lays a foundation for obtaining a good plate type subsequently. The stainless steel strip contains 16.5-20.0% of Cr, so that the stainless steel strip has good corrosion resistance. The stainless steel strip contains 0.02-0.15% of N, austenite can be stabilized, and meanwhile, the strength and the corrosion resistance of the stainless steel strip are improved. 0.01-0.2% of Cu, and can reduce the stacking fault energy of an austenite phase and improve the plasticity and the forming performance of the stainless steel band.
Preferably, the stainless steel strip finished product prepared by the cold rolling method comprises the following components in percentage by weight:
0.03-0.04% of C, 7.0-9.0% of Ni, 17.5-19.0% of Cr, 0.5-2.0% of Mn, 0.02-0.08% of Cu0.02, 0.40-0.80% of Si, 0.02-0.05% of P, 0.01-0.05% of S, 0.02-0.06% of N, and the balance of Fe and inevitable impurities.
The mechanical properties of the stainless steel band finished product are as follows:
| item | Numerical value |
| Yield strength | 300-350MPa |
| Tensile strength | 700-750MPa |
| Elongation of stretching | 50-70％ |
| Hardness of | 160-180HV |
| Surface roughness | 0.15-0.25μm |
Furthermore, 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.
Correspondingly, the invention also provides a stainless steel strip which is prepared by the cold rolling method, drying, cleaning, annealing, electrolyzing, pickling, straightening and flattening in sequence. The drying, cleaning, annealing, electrolysis, pickling, straightening and flattening can be carried out according to the prior art.
The invention is further illustrated by the following specific examples
The working parameters of the first embodiment are as follows:
the preparation method comprises the following steps:
selecting a stainless steel strip blank with a certain thickness;
coiling the stainless steel strip blank;
the rolled stainless steel band blanks are transmitted to a laser welding machine through an inlet loop, and laser welding is carried out on different rolled stainless steel band blanks;
carrying out first cold rolling on the stainless steel strip blank subjected to laser welding through a first cold rolling mill;
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;
carrying out third cold rolling on the stainless steel strip blank subjected to the second cold rolling through a third cold rolling mill;
carrying out fourth cold rolling on the stainless steel strip blank subjected to the third cold rolling through 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 cold rolling on the stainless steel strip blank subjected to the fifth cold rolling through a sixth cold rolling mill;
cleaning the stainless steel strip blank subjected to the sixth cold rolling;
and conveying the cleaned stainless steel strip blank to the next process through an outlet loop, and drying, cleaning, annealing, electrolyzing, pickling, straightening and flattening to obtain a finished stainless steel strip.
And (III) the properties of the finished stainless steel band are as follows:
in conclusion, the fully continuous six-continuous rolling of the invention can improve the mechanical properties of the finished product, the yield strength is 300-350MPa, the tensile strength is 700-750MPa, the tensile rate is 50-70%, the hardness is 160-180HV, and the finished product of the stainless steel band with the thickness of 0.2-4 mm and the 2B mirror surface 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 bands with different thicknesses are met.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (9)
1. A method for cold rolling a stainless steel strip, comprising:
the selected thickness is as follows: 1.0-6.0 mm stainless steel strip blank;
coiling the stainless steel strip blank;
the rolled stainless steel band blanks are transmitted to a laser welding machine through an inlet loop, and laser welding is carried out on different rolled stainless steel band blanks;
carrying out six times of continuous cold rolling treatment on the stainless steel strip blank subjected to laser welding through a cold rolling mill;
the method is characterized in that the stainless steel strip blank subjected to laser welding is subjected to six times of continuous cold rolling treatment through a cold rolling mill, and comprises the following steps:
carrying out first cold rolling on the stainless steel strip blank subjected to laser welding through a first cold rolling mill; 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, and the rolling speed of the first cold rolling mill is 60-110 m/min;
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; 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, and the rolling speed of the second cold rolling mill is 80-150 m/min;
carrying out third cold rolling on the stainless steel strip blank subjected to the second cold rolling through a third cold rolling mill; 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, and the rolling speed of the third cold rolling mill is 90-220 m/min;
carrying out fourth cold rolling on the stainless steel strip blank subjected to the third cold rolling through a fourth cold rolling mill; 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, and the rolling speed of the fourth cold rolling mill is 110-280 m/min;
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; 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, and the rolling speed of the fifth cold rolling mill is 120-310 m/min;
carrying out sixth cold rolling on the stainless steel strip blank subjected to the fifth cold rolling through a sixth cold rolling mill; 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, and the rolling speed of the sixth cold rolling mill is 130-400 m/min;
cleaning the stainless steel strip blank subjected to the sixth cold rolling;
conveying the cleaned stainless steel strip blank to the next process through an outlet loop, and drying, cleaning, annealing, electrolyzing, pickling, straightening and flattening to obtain a stainless steel strip finished product with the thickness of 0.2-4 mm;
the cold rolling mill comprises a working roll for cold rolling, a middle roll arranged above or below the working roll, a supporting roll arranged above or below the middle roll and a side supporting roll arranged on the side edge of the working roll, wherein the side supporting roll is arranged along the axis direction of the working roll, and the pressure sensor is arranged in the inner spiral of the working roll and used for realizing piezomagnetic control.
2. The method for cold rolling a stainless steel strip according to claim 1, wherein the diameter of the work roll is smaller than that of the intermediate roll, and the diameter of the intermediate roll is smaller than that of the support roll.
3. The method for cold rolling a stainless steel strip according to claim 1, wherein the side support rolls comprise three side support sub-rolls arranged in a triangular shape;
wherein, first side supports and divides the roller and the working roll laminating and not laminate with middle roller, and the second side supports and divides the roller laminating and not laminate with middle roller with first side support, and the third side supports and divides the roller laminating and not laminate with second side support with first side support branch roller laminating.
4. The method for cold rolling a 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 one time.
5. The method for cold rolling a stainless steel strip according to claim 4, 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 added with rolling oil during cold rolling, the viscosity of the rolling oil is 600-800mm2/s,
the sum of the reduction ratios of six cold rolling passes is 80 percent at most.
6. The method for cold rolling a stainless steel strip according to claim 1, wherein the stainless steel strip comprises the following components in percentage by weight:
0.01-0.05% of C, 6.0-9.5% of Ni, 16.5-20.0% of Cr, 0.1-3.0% of Mn, 0.01-0.2% of Cu, 0.15-1.0% of Si, 0.01-0.2% of P, 0.01-0.1% of S, 0.02-0.15% of N, and the balance of Fe and inevitable impurities.
7. The cold rolling method for the stainless steel strip as claimed in claim 1, wherein the finished stainless steel strip has a thickness of 0.3-3mm, a yield strength of 300-350MPa, a tensile strength of 700-750MPa, a tensile rate of 50-70%, a hardness of 160-180HV, and a surface roughness of 0.15-0.25 μm.
8. The method for cold rolling a stainless steel strip according to claim 1, wherein an automatic thickness control system and a strip profile control system are provided 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 for controlling the thickness and the strip profile of the stainless steel strip.
9. A stainless steel strip produced by the cold rolling method according to any one of claims 1 to 8.
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| CN110480265A (en) * | 2019-08-19 | 2019-11-22 | 浙江仙居星峰汽车零部件有限公司 | A kind of thermoplastics type highlights automotive trim strip and production technology |
| CN110722846A (en) * | 2019-09-03 | 2020-01-24 | 仙居县精鑫金属材料股份有限公司 | Improved wear-resistant precision steel strip and production process |
| CN110744885A (en) * | 2019-09-05 | 2020-02-04 | 仙居县精鑫金属材料股份有限公司 | Weather-resistant high-hardness stainless steel bright belt and production method thereof |
| CN112024835B (en) * | 2020-07-27 | 2022-03-25 | 河北博远科技有限公司 | Production method of low-permeability cold-rolled stainless steel strip |
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