CN103801567A - Method for eliminating cold-strip steel ribbed strips - Google Patents
Method for eliminating cold-strip steel ribbed strips Download PDFInfo
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- CN103801567A CN103801567A CN201410046409.7A CN201410046409A CN103801567A CN 103801567 A CN103801567 A CN 103801567A CN 201410046409 A CN201410046409 A CN 201410046409A CN 103801567 A CN103801567 A CN 103801567A
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Abstract
The invention discloses a method for eliminating cold-strip steel ribbed strips, and belongs to the technical field of stainless steel production. The method is characterized in that firstly, the deformation rate of the strip steel finished product pass ranges from 7% to 12%; secondly, the unit tension of the strip steel finished product pass changes along with the change of the thickness of strip steel; thirdly, the difference between H3 and H4 times the difference between 1 and the total rolling deformation rate is equal to the inclination setting value delta of a rolling mill arch. According to the method, the ribbed strips on the surface of the strip steel can be eliminated, and quality of the surface of the strip steel is improved.
Description
Technical field
The present invention relates to a kind of method of eliminating Cold Rolling rib line, belong to stainless steel production technical field.
Background technology
Stainless-steel cold-rolling strip mill has strict quality requirement to rolled raw band steel.General Requirements band steel transverse gage is distributed symmetrically.
Shown in Fig. 1, H1 is steel edge portion thickness, and H2 is band steel center thickness, and H3 is band steel thickness thickness.Under normal circumstances, H3 should be in band steel center, and H2 overlaps with H3.But in actual production process, upper step operation, due to roll shape, roll wear and other various template control modes, causes supplying with cold rolling mill materials transverse gage distribution asymmetric, and thickest point always departs from Dai Gang center certain distance h.
Rolling mill for cold rolled steel strip is in the time of rolled band steel, and its roll gap is cydariform symmetric form; Due to the asymmetry distributing with steel transverse gage, the band steel of both sides, Hui Shidaigang center two symmetric points extends generation inhomogeneities, and the side that thickness is large is extended many, and the opposite side that thickness is little extends few.In Fig. 1, H3, the equidistant symmetric points in H2 both sides, H4Shi Daigang center.In the time of rolling, extend and extend many compared with the band steel at H4 place with steel at H3 place.Like this, extend many parts and can be subject to extending the compression of few part, extend few part and can be subject to extending the tension of many parts, belt steel surface there will be the flatness defect of similar people's rib shape, is commonly called as rib line flatness defect.
This flatness defect finished product thickness is thinner, and rib line is more obvious.In the time of finished products pickling, can cause pickling inequality, squeeze roll squeezing effect is poor, and belt steel surface produces serious chromatic aberration defect.
Summary of the invention
In order to overcome above-mentioned deficiency, the invention provides a kind of method of eliminating Cold Rolling rib line, the band steel of both sides, Shi Daigang center extends and reaches unanimity in the time of rolling, reaches and eliminates rib line, improves the object of strip surface quality.
The deformation rate of the present invention's final pass during mainly from rolling, when rolling tensile force and rolling, mill housing is obliquely installed three aspects and starts with to eliminate belt steel rolling rib line.
The technical solution used in the present invention is:
A method of eliminating Cold Rolling rib line, is characterized in that:
(1) band steel final pass deformation rate is 7 ~ 12%;
(2) change with the variation of belt steel thickness with steel final pass unit tension;
(3) mill housing value of being obliquely installed when rolling:
⊿=(H3-H4) × (1-rolling total deformation rate)
Wherein, H3 is band steel lateral cross section thickest point thickness, and H4 is that H3 is with respect to being with steel Central Symmetry point place thickness;
Rolling total deformation rate=1-finished product thickness/raw thickness.
In such scheme, described final pass deformation rate is: nickel steel final pass deformation rate is 7 ~ 9%, and chromium steel final pass deformation rate is 9 ~ 12%.
Described band steel final pass unit tension is: when chromium steel thickness is 0.3 ~ 0.5mm, unit tension is 29 ~ 31kg/mm
2; When chromium steel thickness is 0.6 ~ 0.8mm, unit tension is 27 ~ 30kg/mm
2; When chromium steel thickness is 0.9 ~ 1.2mm, unit tension is 25 ~ 28kg/mm
2; When chromium steel thickness is 1.2mm when above, unit tension is 18 ~ 21kg/mm
2.
Described band steel final pass unit tension is: when nickel steel thickness is 0.3 ~ 0.5mm, unit tension is 34 ~ 36kg/mm
2; When nickel steel thickness is 0.6 ~ 0.8mm, unit tension is 32 ~ 35kg/mm
2; When nickel steel thickness is 0.9 ~ 1.2mm, unit tension is 30 ~ 33kg/mm
2; When nickel steel thickness is 1.2mm when above, unit tension is 23 ~ 26kg/mm
2.
Final pass adopts compared with the rolling of small deformation rate, and draught pressure is little, and band steel plate type can be controlled preferably.
When rolling, mill housing uses tilt function, be mainly make mill roll-gap shape and raw band steel transverse gage distribution shape basically identical, like this, the band steel shutting out can not produce inhomogeneous deformation because of band steel transverse gage skewness, thereby make to be with steel plate type to keep straight, the appearance that alleviates rib line.
The Main Function of Cold Rolling tension force is to stop with the longitudinal inhomogeneous deformation of steel broad ways.When thick point extends when more, tension force can produce stress and concentrate extending less part, impels to extend smaller portions and increase and extend, and reaches the development length identical with extending more part, and like this, the band steel plate type shutting out is straight, basic apleuria striped.Although tension force is beneficial to the control of rolled band steel template, rolling tensile force is unsuitable excessive, otherwise easily zip strip steel causes broken belt.According to the tensile strength of chromium steel and nickel steel, the rolling tensile force of general chromium steel is less than the rolling tensile force of nickel steel.
The method of elimination Cold Rolling rib line provided by the invention, can eliminate the rib line of belt steel surface; Improve the quality of belt steel surface.
Below in conjunction with drawings and Examples, the present invention will be further described.
Accompanying drawing explanation
Fig. 1 is the existing schematic diagram with steel cross section.
Fig. 2 is the schematic diagram of product version type measuring method.
The specific embodiment
Embodiment 1: the method for eliminating Cold Rolling rib line
Take nickel steel as example, special process parameter arranged according to the present invention, carries out belt steel rolling, has eliminated cross rib crackle.
Belt steel thickness is H1=3.0mm, H3=3.05mm, and H4=3.02mm, finished product thickness 0.77mm, rolling total deformation rate is 74%.Rolling technological parameter is as follows:
The mill housing value of being obliquely installed: ⊿=(H3-H4) × (1-rolling total deformation rate)=(3.05-3.02) × (1-0.74)=0.0078
In the present embodiment, band steel is through 9 passage rollings, and the parameter of each passage is:
Finished product thickness is 0.77mm, and final pass deformation rate is 8.3%, and final pass unit tension is 32.2 ~ 32.7kg/mm
2.
Wherein, forward pull is 32.7kg/mm
2, backward pull is 32.2 kg/mm
2.
Effect of rolling: template is good, apleuria striped.Template measured value≤3I.
Template measurement has two kinds of modes, and one is unevenness, and another kind is I value, and unevenness is generally used for off-line finished strip template and measures, and I value is generally used for on-line measurement and the control of template.
The present invention adopts I value to measure version type, and as shown in Figure 2, I value is: Δ L/L (average) × 10
5
Be about to band steel and be longitudinally cut into some little, due to template reason, the length difference of each little.L in Fig. 2 (average) is the mean value of each little length, and Δ L is the poor of the most rectangular and average length L (average).
Embodiment 2: the method for eliminating Cold Rolling rib line
Take chromium steel as example, special process parameter arranged according to the present invention, carries out belt steel rolling, has eliminated cross rib crackle.
Belt steel thickness is H1=4.2mm, H3=4.26mm, H4=4.23mm, finished product thickness 1.44mm, rolling total deformation rate 66%.Rolling technological parameter is as follows:
The mill housing value of being obliquely installed: ⊿=(H3-H4) × (1-rolling total deformation rate)=(4.26-4.23) × (1-0.66)=0.0102
Rolling technological parameter is as follows:
Finished product thickness is 1.44mm, and final pass deformation rate is 10.53%, and final pass unit tension is 18.5 ~ 20.6kg/mm
2.
Wherein, forward pull is 20.6kg/mm
2, backward pull is 18.5 kg/mm
2.
Effect of rolling: template is good, apleuria striped, template measured value≤3I.
Embodiment 3: the method for eliminating Cold Rolling rib line
Take nickel steel as example, special process parameter arranged according to the present invention, carries out belt steel rolling, has eliminated cross rib crackle.
Belt steel thickness is H1=2.0mm, H3=2.03mm, and H4=2.01mm, finished product thickness 0.3mm, rolling total deformation rate is 85%.Rolling technological parameter is as follows:
The mill housing value of being obliquely installed: ⊿=(H3-H4) × (1-rolling total deformation rate)=(2.03-2.01) × (1-0.85)=0.003
In the present embodiment, band steel is through 9 passage rollings, and the parameter of each passage is:
Finished product thickness is 0.3mm, and final pass deformation rate is 8.5%, and final pass unit tension is 35kg/mm
2.
Wherein, forward pull is 35kg/mm
2, backward pull is 35 kg/mm
2.
Effect of rolling: template is good, apleuria striped.Template measured value≤5I.
Embodiment 4: the method for eliminating Cold Rolling rib line
Take chromium steel as example, special process parameter arranged according to the present invention, carries out belt steel rolling, has eliminated cross rib crackle.
Belt steel thickness is H1=3.0mm, H3=3.04mm, H4=3.03mm, finished product thickness 0.9mm, rolling total deformation rate 70%.Rolling technological parameter is as follows:
The mill housing value of being obliquely installed: ⊿=(H3-H4) × (1-rolling total deformation rate)=(3.04-3.03) × (1-0.70)=0.003
Rolling technological parameter is as follows:
Finished product thickness is 0.9mm, and final pass deformation rate is 10.9%, and final pass unit tension is 25 ~ 26kg/mm
2.
Wherein, forward pull is 26kg/mm
2, backward pull is 25kg/mm
2.
Effect of rolling: template is good, apleuria striped, template measured value≤3I.
Claims (4)
1. a method of eliminating Cold Rolling rib line, is characterized in that:
(1) band steel final pass deformation rate is 7 ~ 12%;
(2) change with the variation of belt steel thickness with steel final pass unit tension;
(3) mill housing value of being obliquely installed when rolling:
⊿=(H3-H4) × (1-rolling total deformation rate)
Wherein, H3 is band steel lateral cross section thickest point thickness, and H4 is that H3 is with respect to being with steel Central Symmetry point place thickness;
Rolling total deformation rate=1-finished product thickness/raw thickness.
2. the method for elimination Cold Rolling rib line according to claim 1, is characterized in that: described final pass deformation rate is: nickel steel final pass deformation rate is 7 ~ 9%, chromium steel final pass deformation rate is 9 ~ 12%.
3. the method for elimination Cold Rolling rib line according to claim 1, is characterized in that: described band steel final pass unit tension is: when chromium steel thickness is 0.3 ~ 0.5mm, unit tension is 29 ~ 31kg/mm
2; When chromium steel thickness is 0.6 ~ 0.8mm, unit tension is 27 ~ 30kg/mm
2; When chromium steel thickness is 0.9 ~ 1.2mm, unit tension is 25 ~ 28kg/mm
2; When chromium steel thickness is 1.2mm when above, unit tension is 18 ~ 21kg/mm
2.
4. the method for elimination Cold Rolling rib line according to claim 1, is characterized in that: described band steel final pass unit tension is: when nickel steel thickness is 0.3 ~ 0.5mm, unit tension is 34 ~ 36kg/mm
2; When nickel steel thickness is 0.6 ~ 0.8mm, unit tension is 32 ~ 35kg/mm
2; When nickel steel thickness is 0.9 ~ 1.2mm, unit tension is 30 ~ 33kg/mm
2; When nickel steel thickness is 1.2mm when above, unit tension is 23 ~ 26kg/mm
2.
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| CN201410046409.7A CN103801567B (en) | 2014-02-10 | 2014-02-10 | Eliminate the method for Cold Rolling rib line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107893155A (en) * | 2017-10-31 | 2018-04-10 | 首钢集团有限公司 | Method for eliminating surface color difference defect of phosphorus-containing high-strength IF steel |
| CN109465302A (en) * | 2018-10-09 | 2019-03-15 | 山西太钢不锈钢股份有限公司 | Eliminating 304 is the method that rolled stainless steel skidding prints |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002205107A (en) * | 2000-12-28 | 2002-07-23 | Nkk Corp | Method for cold-rolling steel sheet for thin tinplate |
| CN101352734A (en) * | 2008-08-12 | 2009-01-28 | 山西太钢不锈钢股份有限公司 | Flattening device of accurate band steel |
| CN101690940A (en) * | 2008-12-25 | 2010-04-07 | 山西太钢不锈钢股份有限公司 | Method for rolling precision stainless steel strips with Sendzimir rolling mill |
| CN102240786A (en) * | 2011-06-17 | 2011-11-16 | 云南浩鑫铝箔有限公司 | Method for eliminating longitudinal stripes on surface of cast rolling stock for ultra-thin aluminium foil |
| CN103240280A (en) * | 2013-04-28 | 2013-08-14 | 首钢总公司 | Hot-rolled steel strip vertical stripe defect eliminating method |
-
2014
- 2014-02-10 CN CN201410046409.7A patent/CN103801567B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002205107A (en) * | 2000-12-28 | 2002-07-23 | Nkk Corp | Method for cold-rolling steel sheet for thin tinplate |
| CN101352734A (en) * | 2008-08-12 | 2009-01-28 | 山西太钢不锈钢股份有限公司 | Flattening device of accurate band steel |
| CN101690940A (en) * | 2008-12-25 | 2010-04-07 | 山西太钢不锈钢股份有限公司 | Method for rolling precision stainless steel strips with Sendzimir rolling mill |
| CN102240786A (en) * | 2011-06-17 | 2011-11-16 | 云南浩鑫铝箔有限公司 | Method for eliminating longitudinal stripes on surface of cast rolling stock for ultra-thin aluminium foil |
| CN103240280A (en) * | 2013-04-28 | 2013-08-14 | 首钢总公司 | Hot-rolled steel strip vertical stripe defect eliminating method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107893155A (en) * | 2017-10-31 | 2018-04-10 | 首钢集团有限公司 | Method for eliminating surface color difference defect of phosphorus-containing high-strength IF steel |
| CN107893155B (en) * | 2017-10-31 | 2019-08-30 | 首钢集团有限公司 | Method for eliminating surface color difference defect of phosphorus-containing high-strength IF steel |
| CN109465302A (en) * | 2018-10-09 | 2019-03-15 | 山西太钢不锈钢股份有限公司 | Eliminating 304 is the method that rolled stainless steel skidding prints |
| CN109465302B (en) * | 2018-10-09 | 2020-03-17 | 山西太钢不锈钢股份有限公司 | Method for eliminating rolling slip mark of 304 series stainless steel |
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