CN105377458B - The manufacture method of mild steel cold-rolled strip - Google Patents
The manufacture method of mild steel cold-rolled strip Download PDFInfo
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- CN105377458B CN105377458B CN201380077756.XA CN201380077756A CN105377458B CN 105377458 B CN105377458 B CN 105377458B CN 201380077756 A CN201380077756 A CN 201380077756A CN 105377458 B CN105377458 B CN 105377458B
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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
- 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
- B21B2001/228—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 skin pass rolling or temper rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/10—Roughness of roll surface
-
- 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
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
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Abstract
By the generation of the press-in flaw on cold-rolled strip is prevented using wet type temper rolling, and manufacture the cold-rolled strip having with the cold-rolled strip degree identical surface smoothness manufactured in the case of dry type temper rolling is adopted.After the cold rolling band steel to being made up of mild steel, wet type temper rolling is carried out using smooth roll, manufacture the mild steel cold-rolled strip that surface roughness Ra is less than 0.3 μm.Described cold rolling in, at least one passage is using the hair side roll that surface roughness Ra is 1.0 μm～1.8 μm come, after implementing, final passage is implemented using the smooth roll that surface roughness Ra is 0.1 μm～0.3 μm.
Description
Technical field
The present invention relates to a kind of manufacture method of the good mild steel cold-rolled strip of surface smoothness.
Background technology
Generally, the good mild steel cold-rolled strip of surface smoothness be by the cold-rolled strip by regulation thickness of slab is cold-rolled to
Temper rolling (prolonging) is carried out manufactured.Temper rolling uses smooth roll (Block ラ イ ト ロ Le) as working roll, to pass through
The even surface of smooth roll is transferred in material to be rolled (cold-rolled strip), the Surface Finishing of the rolling stock is smooth shape
State.
As temper rolling, wet type temper rolling and dry type temper rolling both modes is extensively there are known to.Wet type surface
Dress rolling be while to material to be rolled and working roll both sides supply temper rolling oil (lubricating oil) while carrying out the side of temper rolling
Formula.By the cleaning action of the temper rolling oil, by the grease type (ROLLING OIL when cold rolling etc.) on material to be rolled surface, iron powder
And other foreign matters are washed away, its result is the press-in flaw for preventing from occurring in material to be rolled.In addition, press-in flaw be due to
Nip foreign matter between working roll and material to be rolled, and the foreign matter is pressed in material to be rolled and occurs.But, root
According to wet type temper rolling, as temper rolling oil is clipped between working roll and material to be rolled, therefore there is the smooth of smooth roll
Transfer efficiency in the face of material to be rolled declines, and the surface roughness of finished product steel belt becomes big problem.
On the other hand, dry type temper rolling is (not moisten to material to be rolled is oily with the surface supply temper rolling of working roll
Lubricating oil), and make again material to be rolled and working roll be almost dry in the state of carry out the mode of temper rolling.Therefore, in table
In the dress rolling of face, as working roll is directly contacted with material to be rolled not via oil film, therefore the even surface of smooth roll is efficient
Be transferred in material to be rolled.But, according to dry type temper rolling, due to the cleaning action without temper rolling oil, therefore
Foreign matter is liable to stick on material to be rolled or working roll, is susceptible to be pressed into flaw.
The manufacture method of the mild steel cold-rolled strip disclosed in patent document 1, be in the cold-rolled steel to being made up of mild steel
After band cleaning by degreasing is processed, the method that dry type temper rolling carried out to the cold-rolled strip using smooth roll.Cold rolling according to the mild steel
The manufacture method of steel band, due to processing, by cleaning by degreasing, the grease that will be attached on material to be rolled (cold-rolled strip) surface
After class and foreign matter are removed, dry type temper rolling is carried out to the material to be rolled, therefore, it is possible to the less state of the attachment in foreign matter
Under temper rolling is carried out to material to be rolled, the good finished product steel belt of surface smoothness can be manufactured.
Prior art literature
Patent document
Patent document 1：Japanese Patent Publication 2007-130679 publication
Content of the invention
(1) technical problem to be solved
But, in the manufacture method of the mild steel cold-rolled strip disclosed in patent document 1, although at cleaning by degreasing
The foreign matter that reason can be will be attached on cold-rolled strip surface is somewhat removed, but is difficult to adhere to after cleaning by degreasing is processed
Foreign matter in material to be rolled and the foreign matter being attached on the working roll of dry type skin rolling mill are removed.Accordingly, there exist dry type
Often there is the situation of press-in flaw on the surface of the finished product steel belt after temper rolling.For making the work in dry type skin rolling mill
Non-cohesive foreign matter in roller surface, even if thoroughly carry out the cleaning work of dry type skin rolling mill and its surrounding etc., but be also difficult to
Entirely prevent adhering to foreign matter on the surface of working roll.
Replace dry type temper rolling according to wet type temper rolling, then can be complete by the cleaning action of temper rolling oil
The foreign matter on being attached to material to be rolled or work roll surface is removed entirely, is prevented from being pressed into the generation of flaw.But, as described above
Like that, by wet type temper rolling, the even surface that there is smooth roll declines to the transfer efficiency of material to be rolled, the table of finished product steel belt
Face flatness is difficult to the situation of the requirement (such as surface roughness Ra is less than 0.3 μm) for meeting certain.
The present invention is completed in view of the above-mentioned problems, it is intended that providing a kind of system of mild steel cold-rolled strip
Method is made, its generation by preventing the press-in flaw on cold-rolled strip using wet type temper rolling, and tool can be manufactured
There is the cold-rolled strip with degree surface smoothness with the cold-rolled strip using manufacture in the case of dry type temper rolling.
(2) technical scheme
The manufacture method of the mild steel cold-rolled strip of the present invention, with using light after the cold rolling band steel to being made up of mild steel
Premised on roller carries out wet type temper rolling, it is characterised in that described cold rolling be at least one passage using hair roller (ダ Le ロ Le)
After implementing, final passage is implemented using smooth roll.
According to the manufacture method of the mild steel cold-rolled strip, by adopting wet type temper rolling, using temper rolling oil
The foreign substance cleaning that cleaning action is will be attached on working roll and material to be rolled surface is removed, therefore, it is possible to prevent in rolled material
The generation of the upper press-in flaw of material (cold-rolled strip).Additionally, in cold rolling before wet type temper rolling, when carrying out using hair side roll
Cold rolling when, the surface of hair side roll is played a role as oil groove, makes to be difficult to form oil groove in material to be rolled.Also, it is logical
Cross carries out to improve the surface smoothness of material to be rolled using the cold rolling of smooth roll in final passage.By using surface
The sufficiently small roller of roughness is used as the smooth roll used in the final passage, even if smooth roll is to quilt in wet type temper rolling
The transfer efficiency step-down of rolling stock, it is also possible to compensate the reduction amount of the transfer efficiency, makes the finished product steel belt after temper rolling
Surface roughness is fully smoothed.
Preferably, the surface roughness Ra for carrying out the cold-rolled strip after the wet type temper rolling is less than 0.3 μm.
Preferably, the surface roughness Ra of the smooth roll is 0.1 μm～0.3 μm.
Preferably, the surface roughness Ra of the hair side roll is 1.0 μm～1.8 μm.
(3) beneficial effect
According to the manufacture method of the mild steel cold-rolled strip of the present invention, can not make under the surface smoothness of finished product steel belt
Drop, prevents the generation for being pressed into flaw etc. on finished product steel belt.
Description of the drawings
Fig. 1 is to represent finished product steel belt obtained from the manufacture method by the mild steel cold-rolled strip of the embodiment of the present invention
The table of the measurement result of surface roughness and block diagram.In figure transverse axis represents the surface roughness of finished product steel belt, in figure longitudinal axis table
Show N number (manufacture number).
Fig. 2 is the rough surface for representing finished product steel belt obtained from the manufacture method by conventional mild steel cold-rolled strip
The table of the measurement result of degree and block diagram.In figure transverse axis represents the surface roughness of finished product steel belt, and the in figure longitudinal axis represents N number (system
Make number).
Specific embodiment
Below, the manufacture method to the mild steel cold-rolled strip of embodiment of the present invention is illustrated.The mild steel is cold rolling
The manufacture method of steel band is as described below：Slab with the mild steel that is modulated to regulation steel component as raw material, through hot-rolled process,
Pickling process etc. and obtain steel band, carry out cold rolling, to carry out wet type temper rolling afterwards method to the steel band.In addition, by adopting
Wet type temper rolling is used, and the cleaning by degreasing for removing the cold-rolled lubricating oil being attached in material to be rolled etc. can be omitted after cold rolling
Process.Further, since mild steel is not susceptible to by the cold rolling processing hardening for causing, therefore, it is possible to omit cold rolling rear wet type surface light
The annealing operation of the material to be rolled before rolling.
The steel type of above-mentioned mild steel cold-rolled strip is, for example, the mild steel that C content is below 0.12 mass %.As
The typical example of the mild steel, can enumerate described in " reference " hurdle of JIS G 3141 " cold rolling steel plate and steel band "
" SPCC (typically with cold-rolled carbon steel thin plate and steel band) ".In the SPCC, C content is below 0.12 mass %, and Mn content is 0.50
Below quality %, P content is below 0.040 mass %, and S content is 0.045 mass %, and its remaining part is miscellaneous by Fe and inevitably
Quality structure becomes.
As above-mentioned cold rolling cold-rolling mill is carried out, for example can be using the reversible cold-rolling that can be inverted rolling direction
Machine.Used as the working roll of the cold-rolling mill, the 1st passage uses hair side roll.After 2nd passage, except the situation for final passage
In addition, hair side roll is also then used by.Smooth roll used in final passage (ス system ス ロ Le).But, above-mentioned hair
Face roll preferably uses the roll that surface roughness Ra is 1.0 μm～1.8 μm, additionally, above-mentioned smooth roll preferably uses surface
Roughness Ra is 0.1 μm～0.3 μm of roll.Road number of times is not particularly limited, but for example in the case that road number of times is " 5 ",
Hair side roll is used in the 1st～4 passage, only smooth roll is used in the 5th passage as final passage.In addition, rough surface
Degree Ra be by the center line average roughness of 0601 defined of JIS B.In addition, cold rolling reduction ratio is suitable according to the purposes of steel band
When determined, but it is preferably set to e.g., from about 50%～70%.
In above-mentioned wet type temper rolling, smooth roll is used as the working roll of wet type skin rolling mill, to working roll
And material to be rolled both sides supply temper rolling oil (lubricating oil) are while rolled.The extension of the steel band in wet type temper rolling
Rate (ε) needs to control the scope 0.2～1.5%.Wide load corresponding with the elongation percentage (ε) is about 0.3～0.7Ton/
Mm degree.Elongation percentage (ε) is limited within the above range (0.2～1.5%).The table being because in the elongation percentage lower than the scope
In the dress rolling of face, the transferring effect of roller surface is weak, causes the deficiency of the flatness on finished product steel belt surface, on the other hand, is exceeding
In the temper rolling of the scope, the ductility of finished product steel belt declines to a great extent, it is difficult to guarantee good press processability etc..Preferably
Elongation percentage (ε) is for about 0.4%～1.0%, most preferably 0.6%～0.8%.
In the past, present applicant surface roughness Ra used in whole passages is 0.4 μm～0.6 μm of light face
Roll carries out cold rolling as the working roll of cold-rolling mill, then carries out dry type temper rolling after to the cold-rolled strip cleaning by degreasing,
Produce the finished product steel belt (mild steel cold-rolled strip) for meeting certain specification (such as surface roughness Ra is less than 0.3 μm).?
In the manufacture method, due to there is often press-in flaw on finished product steel belt, so present inventor is repeatedly to finished steel
Band disclosure satisfy that above-mentioned certain specification and can entirely prevent the manufacturer of the mild steel cold-rolled strip of the generation for being pressed into flaw
Method has carried out deep experimental study.
Its result is that present inventor using by entirely preventing pressure using wet type temper rolling as temper rolling
Premised on entering the generation of flaw, problem to the decline of the transfer efficiency of smooth roll, the working roll table being conceived to used in cold rolling
Surface roughness is solving the above problems.Following understanding has namely been obtained：By as described above in cold rolling 1st passage use
Hair side roll, after the 2nd passage, is also then used by hair side roll, in addition to the situation for final passage in final passage
Using smooth roll, the finished product steel belt after wet type temper rolling can be made to meet above-mentioned certain specification.
By so changing the surface roughness of the working roll of cold-rolling mill, finished product steel belt can be made to meet above-mentioned certain specification
The reasons why be, it may be considered that relevant with the formation of oil groove.When carrying out cold rolling, roll to material to be rolled and working roll supply
Liquefaction is while carry out cooling and the lubrication of these material to be rolled and working roll.As in the past in whole passages all using table
Surface roughness Ra be 0.4 μm～0.6 μm of smooth roll carry out cold rolling in the case of, can in material to be rolled formed oil groove,
So as to cause to define a large amount of oil grooves in the material to be rolled after cold rolling.
Cold rolling as present embodiment, in the case of using hair side roll beyond final passage as working roll,
Using during hair side roll, due to ROLLING OIL enter into hair side roller surface concavo-convex in, make the surface as oil groove
Play a role, therefore become to be difficult to oil groove is formed in material to be rolled.Also, pass through rough surface used in final passage
Degree Ra is 0.1 μm～0.3 μm of smooth roll (surface roughness is very little compared with the smooth roll for using in the past), makes cold rolling
The surface roughness of material to be rolled afterwards is compared with the past to become very little, even if smooth roll is to being rolled in wet type temper rolling
The transfer efficiency step-down of prepared material, it is also possible to compensate the slippage of the transfer efficiency, so as to substantially ensure that becoming after temper rolling
The surface roughness of product steel band.That is, disclosure satisfy that above-mentioned certain specification (surface roughness Ra is below 0.3 μm).
As described above, the manufacture method of the mild steel cold-rolled strip according to embodiment of the present invention, is made using wet-format
Be the temper rolling carried out after cold rolling, temper rolling oil is supplied to the working roll of skin rolling mill and material to be rolled both sides,
The foreign matter on the surface of working roll and material to be rolled be will be attached to by the cleaning action of the temper rolling oil to wash off, therefore can
The generation of press-in flaw material to be rolled in is enough prevented.Additionally, following cold rolling by implementing, i.e., the 1st passage uses surface
Roughness Ra is 1.0 μm～1.8 μm of hair side roll, after the 2nd passage, also then makes in addition to the situation for final passage
With identical hair side roll, surface roughness Ra used in final passage is 0.1 μm～0.3 μm of smooth roll, so as to i.e.
Make using wet type temper rolling, it is also possible to which (such as surface roughness Ra is 0.3 with horizontal identical surface roughness in the past for manufacture
Below μm) finished product steel belt.
Embodiment
Below, embodiments of the invention are illustrated.In this embodiment, with mild steel slab as raw material, via heat
Roll and the pickling processes (processing of rust removing) of hot rolled steel plate and obtain material to be rolled, the material to be rolled is carried out cold rolling.Cold rolling
In, hair side roll that surface roughness Ra is 1.0 μm～1.8 μm is used as working roll in the 1st～4 passage, as final
5th passage of passage uses smooth roll that surface roughness Ra is 0.1 μm～0.3 μm as working roll.Not to thus obtaining
Cold-rolled strip carry out cleaning by degreasing process, implement wet type temper rolling, so as to be adjusted the finished steel of surface roughness
Band (mild steel cold-rolled strip).The steel band is comparable to sheet material (the hardening classification of SPCC-1B (JIS G3141)：Hard；Surface
Finishing classification：Polishing finishing).
Additionally, as the manufacture method of conventional mild steel cold-rolled strip, with mild steel slab as raw material, via hot rolling and
The pickling processes of hot rolled steel plate and obtain material to be rolled, material is pressed to use surface roughness in the 1st～5 passage to this
It is cold rolling that Ra is that 0.4 μm～0.6 μm of smooth roll is carried out as working roll, and thus obtained cold-rolled strip cleaning by degreasing is processed
Afterwards, implement dry type temper rolling, be also adjusted the finished product steel belt (mild steel cold-rolled strip) of surface roughness.The steel band
It is comparable to sheet material (the hardening classification of SPCC-1B (JIS G3141)：Hard；Surface Finishing is classified：Polishing finishing).
The component of the steel in the manufacture method of embodiments of the invention and conventional manufacture method, hot-rolled condition, cold rolling bar
Shown in following (1)～(3) of part.That is, the component of (1) steel is：C content is 0.02～0.06 mass %, and Mn content is 0.4～0.48
Quality %, P content are 0.02 mass %, and S content is 0.01 mass %.(2) hot-rolled condition is：Hot rolling Finishing temperatures are 875
～935 DEG C, coiling temperature is 535～635 DEG C.(3) cold rolling condition is：Reduction ratio is 52.6%, and cold rolling thickness of slab is 1.61mm.
As temper rolling condition, using implement wet lapping process (using granularity for #320 abrasive sand) have
The smooth roll of even surface is used as working roll.In wet type temper rolling, " ND-10 changes " (Datong District's chemistry strain formula meeting of concentration 6%
Prepared by society) as temper rolling oil.Any surface dress rolling all makes steel band elongation percentage for 0.6%～0.7%.
Fig. 1 represents the measurement knot of the surface roughness of the finished product steel belt obtained by the manufacture method of embodiments of the invention
Really, Fig. 2 represents the measurement result of the surface roughness of the finished product steel belt obtained by conventional manufacture method.As shown in figure 1, logical
Cross the finished product steel belt that the manufacture method of embodiments of the invention is obtained, N number (manufacture number) be 21, surface roughness Ra average
It is worth for 0.148 (0.154), standard deviation is 0.011 (0.011), maximum is 0.169 (0.171), minimum of a value is 0.125
(0.132).In addition, () value outward represents the surface (i.e. upper surface) of steel band, the value in () represents the back side (the i.e. following table of steel band
Face).Do not find to be pressed into flaw on the finished product steel belt obtained by the manufacture method.
On the other hand, the finished product steel belt for being obtained by conventional manufacture method, N number (manufacture number) are 304 (304), table
The mean value of surface roughness Ra is 0.151 (0.169), and standard deviation is 0.035 (0.033), and maximum is 0.284 (0.292),
Minimum of a value is 0.078 (0.075).
If two kinds of manufacture methods compared, as N number has relatively big difference, the therefore standard deviation of surface roughness Ra
Difference, maximum and greatest length also have a relatively big difference, but the mean value of surface roughness Ra can be described as roughly equal.That is, according to
The manufacture method of embodiments of the invention, it may be said that the cold-rolled strip for having and manufacturing by conventional manufacture method can be manufactured
The finished product of degree identical surface roughness Ra.
Industrial applicibility
The present invention for example can be applied in the manufacturing line for being used for manufacturing the good mild steel cold-rolled strip of surface smoothness,
The mild steel cold-rolled strip for producing can be suitably applied to mechanical part, electric/electronic part, automobile component etc..
Claims (4)
1. a kind of manufacture method of mild steel cold-rolled strip, is carried out using smooth roll wet after the cold rolling band steel to being made up of mild steel
Formula temper rolling, it is characterised in that
Described cold rolling be that final passage is implemented using smooth roll after at least one passage is implemented using hair side roll.
2. the manufacture method of mild steel cold-rolled strip according to claim 1, it is characterised in that carry out the wet type surface
The surface roughness Ra of the cold-rolled strip after dress rolling is less than 0.3 μm.
3. the manufacture method of mild steel cold-rolled strip according to claim 1, it is characterised in that the table of the smooth roll
Surface roughness Ra is 0.1 μm～0.3 μm.
4. the manufacture method of the mild steel cold-rolled strip according to claim 1 or 3, it is characterised in that the hair side roll
Surface roughness Ra be 1.0 μm～1.8 μm.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2013/071193 WO2015019409A1 (en) | 2013-08-06 | 2013-08-06 | Process for producing cold-rolled low-carbon-steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105377458A CN105377458A (en) | 2016-03-02 |
| CN105377458B true CN105377458B (en) | 2017-03-08 |
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| WO (1) | WO2015019409A1 (en) |
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| CN114632825B (en) * | 2020-07-23 | 2024-02-02 | 柳州钢铁股份有限公司 | Cover type annealing production method for cold continuous rolling ultra-low roughness high strength steel optical panel |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04253504A (en) * | 1991-02-01 | 1992-09-09 | Sumitomo Metal Ind Ltd | Device and method for manufacturing cold rolled steel plate having clean surface |
| JP2915667B2 (en) * | 1991-12-27 | 1999-07-05 | 新日本製鐵株式会社 | Metal strip having high surface gloss and method for producing the same |
| JP2910603B2 (en) * | 1995-02-13 | 1999-06-23 | 住友金属工業株式会社 | Temper rolling method |
| JPH1177123A (en) * | 1997-09-03 | 1999-03-23 | Nkk Corp | Method for controlling dull rolling in cold rolling mill |
| JP4809664B2 (en) * | 2005-11-14 | 2011-11-09 | 日新製鋼株式会社 | Method for producing low-carbon steel cold-rolled steel strip with excellent surface smoothness |
| US8322178B2 (en) * | 2006-12-18 | 2012-12-04 | Jfe Steel Corporation | Method for performing temper rolling on steel strip and method for manufacturing high tensile-strength cold rolled steel sheet |
| JP4864172B2 (en) * | 2009-12-15 | 2012-02-01 | 三菱日立製鉄機械株式会社 | Cold rolled material manufacturing equipment and cold rolling method |
| CN101869910A (en) * | 2010-06-04 | 2010-10-27 | 山东泰山建能机械集团有限公司 | Method for machining special surface of cold rolled stainless steel band |
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2013
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| WO2015019409A1 (en) | 2015-02-12 |
| CN105377458A (en) | 2016-03-02 |
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