CN106269860B - A kind of method for preventing cold-strip steel edge crack - Google Patents

A kind of method for preventing cold-strip steel edge crack Download PDF

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Publication number
CN106269860B
CN106269860B CN201610681836.1A CN201610681836A CN106269860B CN 106269860 B CN106269860 B CN 106269860B CN 201610681836 A CN201610681836 A CN 201610681836A CN 106269860 B CN106269860 B CN 106269860B
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straightening
elongation percentage
rolling
strip
passes
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CN201610681836.1A
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CN106269860A (en
Inventor
陈连生
李跃
魏英立
宋进英
郑小平
李红斌
张荣华
董福涛
刘倩
马劲红
田亚强
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North China University of Science and Technology
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North China University of Science and Technology
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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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • 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
    • B21B2001/221—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 by cold-rolling
    • 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
    • B21B2015/0064—Uncoiling the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension

Abstract

The present invention provides a kind of method for preventing cold-strip steel edge crack, comprise the following steps：By steel successively through overpickling and rolling process；Wherein, in acid cleaning process, straightening elongation percentage is decreased to the 50% of conventional straightening elongation percentage in straightening uncoiling, and pickle concentration increases 5~10g/L on normal concentration, and pickling speed is down to the 70% of conventional speeds；The routine straightening elongation percentage is 1%~5%；The normal concentration is 120g/L~170g/L；The conventional speeds are 120m/min~170m/min.Test result indicates that method provided by the invention can be effectively improved cold-rolled strip edge cracks, product quality is improved.

Description

A kind of method for preventing cold-strip steel edge crack
Technical field
The invention belongs to steel processing technique field, more particularly to a kind of method for preventing cold-strip steel edge crack.
Background technology
While it is relatively conventional edge fault in cold-rolled strip production to split, often to occur in batches.While the presence split not only shadow The quality of strip product has been rung, but also can jointly cause the damage of production equipment, has caused the decline of production yields, serious shadow Being smoothed out for production is rung, larger economic loss is caused to manufacturing enterprise.It is always cold-strip steel enterprise for the control that side is split The problem of industry technological staff compares concern.
Because steel billet in itself existing for the inside and outside defect of partial decarburization or steel billet because of its high-temperature oxydation in heating furnace, make Into local organization oxidation and decarbonization, the serious inhomogeneous deformation of rolling section can be caused.Local organization decarburization defect is in metal inside point Cloth is uneven, and defect volume is bigger, and distribution is more uneven, and inhomogeneous deformation can be made stronger, easily cause stress collection in fault location In, cause formation of crack, during rolling and then expand to side and split.
For there are the raw material of partial decarburization, such as using conventional rolling strategy, the edge with partial decarburization can be because becoming Shape is uneven and produces side and splits defect, can cause broken belt accident occurs in the operation of rolling when serious, influence normal productive process, cause Business economic is lost.
The content of the invention
In view of this, it is an object of the invention to provide a kind of method for preventing cold-strip steel edge crack, the present invention to carry The method of confession can prevent cold-rolled strip from side occurs and splits on the premise of equipment is not changed, do not increase cost, improve product quality.
The present invention provides a kind of method for preventing cold-strip steel edge crack, comprise the following steps：Steel are passed through successively Overpickling and rolling process；
Wherein, in acid cleaning process, straightening elongation percentage is decreased to the 50% of conventional straightening elongation percentage in straightening uncoiling, pickle Concentration increases 5~10g/L on normal concentration, and pickling speed is down to the 70% of conventional speeds；
The routine straightening elongation percentage is 1%~5%；The normal concentration is 120g/L~170g/L；The conventional speed Spend for 120m/min~170m/min.
The present invention extends the straightening of straightening uncoiling in acid cleaning process on the premise of equipment is not changed, do not increase cost Rate is decreased to the 50% of conventional straightening elongation percentage, and reducing, there is the strip of partial decarburization defect, which to pass through drawing suffered during straightening, answers Power, so as to prevent or reduce layering at raw material partial decarburization and micro-crack is extended because by big tension force；At the same time by pickling Liquid concentration increases 5~10g/L on normal concentration, and pickling speed is down to the 70% of conventional speeds, is reducing withdrawal straightening machine elongation percentage In the case of, lifted pickling effect, it is ensured that belt steel surface iron scale pickling is clean, be to reduce elongation percentage caused by scale breading not The compensation of foot, so as to can realize the raw material with partial decarburization defect in the suitable steady rolling of cold mill complex and prevent from subsequently rolling Cold-rolled strip generation side is split during system, improves product quality.Test result indicates that method provided by the invention can effectively change Kind cold-rolled strip edge cracks, improve product quality.
Steel are carried out pickling by the present invention first, and specifically, the pickling is process well known to those skilled in the art, Such as one typical process can be：Straightening uncoiling → entrance shearing → welding → scale breading → pinch machine → kink → pickling → Acid tank → rinse bath → purging → potcher → neutralization chamber → purging → drying → outlet pinch → outlet is sheared → is returned to batch.
In acid cleaning process is carried out, straightening elongation percentage is decreased to the 50% of conventional straightening elongation percentage in straightening uncoiling, specifically For, operation can be taken the lead to the withdrawal straightening machine entrance weld seam detection position of pickling section in the strip with partial decarburization defect Before, automatically controlled manually on level-one basis interface by strip by the elongation percentage parameter setting of withdrawal straightening machine for it is conventional when 50%. For example, elongation percentage is set as 3% when normal volume passes through withdrawal straightening machine, then the strip with partial decarburization defect passes through withdrawal straightening machine Elongation percentage is just set as 1.5%.Such a straightening strategy, can reduce the institute when strip with partial decarburization defect passes through straightening The tension being subject to, so as to prevent or reduce the layering of raw material partial decarburization fault location and micro-crack expands because by big tension force Exhibition.The routine straightening elongation percentage is 1%~5%, is preferably 3%.
In acid cleaning process is carried out, pickle concentration increases 5~10g/L on normal concentration, and pickling speed is down to routine The 70% of speed, specifically, before the descaling bath entrance for taking the lead to run to pickling section of the strip with partial decarburization defect, Pickling concentration is increased 5 to 10g/L on the basis of normal concentration by pickling concentration control system；And with local de- The strip of carbon defects take the lead operation to pickling section descaling bath when pickling speed is down to routine when 70%.It is for example, normal Pickling concentration is 150g/L, and normal pickling speed is 150 meters of per minute, then pickling concentration of the strip with partial decarburization defect Need to adjust to 155 to 160g/L, pickling speed need to adjust to 105 meters it is per minute.Purpose is to reduce withdrawal straightening machine elongation percentage In the case of, lifted pickling effect, it is ensured that belt steel surface iron scale pickling is clean, be to reduce elongation percentage caused by scale breading not The compensation of foot.In the present invention, the normal concentration of the pickle is 120g/L~170g/L, is preferably 150g/L；The acid The conventional speeds washed are 120m/min~170m/min, are preferably 150m/min.
Rolled after pickling, the present invention is preferred to carry out cold continuous rolling rolling.Referring to Fig. 5, Fig. 5 is cold continuous rolling of the present invention Operation of rolling schematic diagram, the steel that pickling finishes are rolled by the first calibrator, the first tension meter roll, three roller jockey pulleys, 1# successively Machine, the second calibrator, the first tachymeter, 2# milling trains, the second tension meter roll, the second tachymeter, 3# milling trains, the 3rd tension meter roll, 3rd tachymeter, 4# milling trains, the 4th tension meter roll, the 3rd calibrator, the 4th tachymeter, 5# milling trains, the 5th tension meter roll, the 5th Calibrator, Bian Jiangyi, plate profile instrument, pinch roller, rotary drum flying shear, slewing rollers and coiling machine, complete rolling.That is, the present invention preferably passes through Cross five passes, i.e., rolled using five racks, wherein, the drafts of the first passes for overall reduction 40% with On, the drafts of the second passes is more than the 30% of overall reduction.Specifically, the present invention is rolled in rolling using big The sharing of load rolling strategy of pressing layering is realized in power and big pressure, and the sharing of load of the first two rack is set as overall reduction More than 70%：The first rack sharing of load is increased to more than the 40% of overall reduction, utilizes the rolling pressure of the first rack Power drop raw material lamination defect caused by decarburization is fully pressed；The sharing of load of second rack is increased into overall reduction More than 30%, utilize the second rack draught pressure consolidate pressing effect；The sharing of load of three racks is according to Secondary process afterwards Computer rolling model sets itself, it is ensured that completed belt steel plate shape and thickness control accuracy.For example, Secondary process computer rolls The sharing of load that model is set automatically is respectively：30%, 25%, 20%, 15%, 10%, then under this rolling strategy, it is necessary to Strip with partial decarburization defect is taken the lead before reaching 1# rack entrance weld seam detections, in Secondary process control interface manually Sharing of load is revised as：43%, 32%, then Secondary process computer rolling model can be former according to the distribution of certain rolling load The sharing of load of rear three rack is then calculated automatically, such as respectively 13%, 8%, 4%.
In the operation of rolling, the present invention uses the tension force setting strategy of micro- tension between forebay, in the first passes With the second passes, i.e., Minimal Tension setting value is used between the 1st and the 2nd rack, reduce strip between the 1st and the 2nd rack Suffered tension, it is ensured that the strip between the 1st and the 2nd rack will not be because being subject to larger tension and with decarburization defect Position produce side split defect；Conventional tensile setting value is used between follow-up rack, it is ensured that relatively thin strip is not between follow-up rack Deviation phenomenon occurs.For example, the tension schedule that Secondary process computer rolling model is set automatically is respectively：130N/mm2, 170N/mm2, 230N/mm2, 50N/mm2, then under this rolling strategy, take the lead to reach in the strip with partial decarburization defect By the tension force manual correction between the 1st and the 2nd rack it is 90N/ in Secondary process control interface before 1# rack entrance weld seam detections mm2, that is, about 30% is reduced, other racks remain unchanged.In the present invention, the force value that parts a little is 80N/mm2~100N/ mm2, it is preferably 90N/mm2。
Test result indicates that method provided by the invention can be effectively improved cold-rolled strip edge cracks, product matter is improved Amount.
Brief description of the drawings
Fig. 1 and Fig. 2 is the photo for the cold-rolled strip that the method that comparative example 1 of the present invention provides obtains；
Fig. 3 is the photo for the cold-rolled strip that the method that the embodiment of the present invention 1 provides obtains；
Fig. 4 is the broken belt rate of the embodiment of the present invention and comparative example by the monodrome control figure in stage；
Fig. 5 is cold continuous rolling operation of rolling schematic diagram of the present invention.
Embodiment
Comparative example 1
It is 2.6mm by thickness, width 1200mm, (its specific component is as follows for the hot-strip that steel grade is SPHC：0.08C, 0.014Si, 0.16Mn, 0.028P, 0.011S, 0.028Cr, 0.027Ni, 0.021Cu, surplus Fe, mass percent) pass through successively Overpickling and rolling process as shown in Figure 5, are prepared the cold-strip steel that thickness is 0.5mm, wherein, during pickling straightening extend Rate is 3%, pickle be 150g/L hydrochloric acid, pickling speed 150m/min；In the operation of rolling sharing of load of five racks according to Secondary is 30%, 25%, 20%, 15% and 10%；Tension force between 1#, 2#, 3#, 4# and 5# rack is followed successively by 130N/mm2, 170N/mm2, 230N/mm2, 50N/mm2。
Embodiment 1
It is 2.6mm by thickness, width 1200mm, (its specific component is as follows for the hot-strip that steel grade is SPHC：0.08C, 0.014Si, 0.16Mn, 0.028P, 0.011S, 0.028Cr, 0.027Ni, 0.021Cu, surplus Fe, mass percent) pass through successively Overpickling and rolling process as shown in Figure 5, are prepared the cold-strip steel that thickness is 0.5mm；Wherein, straightening extends during pickling Rate is 1.5%, acid solution be 160g/L hydrochloric acid, pickling speed 105m/min；In the operation of rolling sharing of load of five racks according to Secondary is 43%, 32%, 13%, 8% and 4%；Tension force between 1#, 2#, 3#, 4# and 5# rack is followed successively by 90N/mm2, 170N/ mm2, 230N/mm2, 50N/mm2。
As a result referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, Fig. 1 and Fig. 2 are the cold rollings that the method that comparative example 1 of the present invention provides obtains The photo of steel band；Fig. 3 is the photo for the cold-rolled strip that the method that the embodiment of the present invention 1 provides obtains；Fig. 4 is the embodiment of the present invention The monodrome control figure in stage is pressed with the broken belt rate of comparative example.From Fig. 1, Fig. 2, Fig. 3 and Fig. 4, method energy provided by the invention Cold-rolled strip edge cracks are enough effectively improved, improve product quality.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (7)

  1. A kind of 1. method for preventing cold-strip steel edge crack, it is characterised in that comprise the following steps：By steel successively through peracid Wash and rolling process；
    Wherein, in acid cleaning process, straightening elongation percentage is decreased to the 50% of conventional straightening elongation percentage in straightening uncoiling, pickle concentration Increase 5~10g/L on normal concentration, pickling speed is down to the 70% of conventional speeds；
    The routine straightening elongation percentage is 1%~5%；The normal concentration is 120g/L~170g/L；The conventional speeds are 120m/min~170m/min.
  2. 2. according to the method described in claim 1, it is characterized in that, the routine straightening elongation percentage is 3%；The normal concentration For 150g/L；The conventional speeds are 150m/min.
  3. 3. method according to claim 1 or 2, it is characterised in that the operation of rolling carries out five passes, wherein, first The drafts of passes is more than the 40% of overall reduction, the drafts of the second passes for overall reduction 30% with On.
  4. 4. according to the method described in claim 3, it is characterized in that, the first passes and the second passes in the operation of rolling Between be set as parting force value a little.
  5. 5. according to the method described in claim 4, it is characterized in that, the force value that parts a little is 80N/mm2~100N/mm2。
  6. 6. according to the method described in claim 5, it is characterized in that, the force value that parts a little is 90N/mm2。
  7. 7. according to the method described in claim 1, it is characterized in that, the trade mark of the steel is SPHC.
CN201610681836.1A 2016-08-18 2016-08-18 A kind of method for preventing cold-strip steel edge crack Active CN106269860B (en)

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CN112845675B (en) * 2021-01-04 2022-11-01 包头钢铁（集团）有限责任公司 Method for straightening low-grade non-oriented silicon steel by withdrawal straightening machine

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JP2003064461A (en) * 2001-06-14 2003-03-05 Nippon Steel Corp Continuous galvanizing treatment equipment and continuous galvanizing treatment method
CN100430511C (en) * 2005-06-30 2008-11-05 宝山钢铁股份有限公司 Cold rolled strip steel for shadow mask and its making process
CN103331303B (en) * 2013-06-17 2016-02-24 北京首钢股份有限公司 A kind of pickling milling method of cold rolling parking spot
CN105268746B (en) * 2015-11-11 2018-01-12 北京首钢股份有限公司 A kind of levelling method of hot rolling acid-cleaning plate surface cross breaks defect

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