CN103920738B - A kind of low acid consumes with heat for cold belt product made from steel production method - Google Patents
A kind of low acid consumes with heat for cold belt product made from steel production method Download PDFInfo
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Abstract
The present invention relates to a kind of low acid consumption with heat for cold belt product made from steel production method, specifically comprise the steps: uncoiler uncoiling; Planisher carries out fragmentation, stripping to the oxide of belt steel surface; Multi-roll straightening machine is to broken, the stripping further of the oxide of belt steel surface; Scrubbing roller in brushing device removes the oxide that belt steel surface comes off and loosens; Pickling, rinsing is carried out by through smooth, the band steel aligned and scrub after process; Through polishing machine, even surface roughness process is carried out to the product after pickling; Strip coiling after process is become finished product by coiling machine; By this programme, facilitate the acid solution rapid osmotic in acid cleaning process, promote pickling efficiency; Scrub technique will to be separated with band steel body but still unpeeled oxide is removed further, thus greatly reduce acid reaction amount, reduce acid consumption; After processing, band steel yield strength value added is low, and strip property is substantially unaffected; Avoid the luders band defect that common hot-rolled product often occurs.
Description
Technical field
The present invention relates to common hot rolled flat material deep process technology field, particularly relate to a kind of low acid consumption with heat for cold belt product made from steel production method.
Background technology
Hot-strip is through process of surface treatment clear board face oxide, building can be applied to by Substitute For Partial cold-rolled products after the process of recycling polishing machine, automobile, the fields such as household electrical appliances, this product has very large cost-competitive, pickling skin pass mill group as shown in Figure 1 produces the said goods, conventional pickling skin pass mill group is by uncoiler 1, entry loop 2, withdrawal straightening machine 3, pickling 4, rinsing 30, outlet looping 5, polishing machine and coiling machine 6 are formed, withdrawal straightening machine 4 is adopted to carry out mechanical scale breading, band steel 7 after scale breading enters in pickling 4, surface finishing process is carried out after pickling 4, it is undesirable that this production technology also exists scale breading effect, pickling efficiency is low, acid consumption is large, the problems such as properties of product and surface quality cannot meet the demands.
As shown in Figure 2, oxide 8 with steel 7 surface in straightening process forms the oxide crackle 9 consistent with band steel 7 width under the effect of tension with bending stress, in band steel 7 elastic recovery after withdrawal straightening machine 3, the oxide crackle 9 that band steel 7 surface has been produced closes, for retainer belt steel 7 performance, need the percentage elongation of withdrawal straightening machine 3 to be arranged on below band steel 7 yield limit, under such conditions, after band steel 7 leaves withdrawal straightening machine 3, band steel 7 body elastic recovery, causes band steel 7 oxide on surface crackle 9 to close.
Therefore in the process of pickling 4, acid solution in descaling bath is difficult to penetrate into FeO layer from closed oxide crackle 9, and react with it, thus cause the efficiency of pickling 4 very low, in order to improve pickling efficiency, on the yield limit needing the percentage elongation of withdrawal straightening machine 3 to be arranged on band steel 7, band steel 7 is made to produce plastic deformation, under such conditions, the gap of oxide on surface 8 partly can be kept after leaving withdrawal straightening machine 3 with steel 7, promote pickling efficiency, but the performance loss of band steel 7 product is serious.
As shown in Figure 3, for the conventional hot rolled plate of the interstitial atom such as carbon, nitrogen content >=30ppm, uneven surface surrender can be produced on band steel 7 surface after entering withdrawal straightening machine 3, be commonly called as luders band 10; For the band steel 7 that high-strength steel, IF steel are made, although luders band 10 can not be produced on band steel 7 surface, due to the unidirectional increase along with the increase of percentage elongation of its yield strength, therefore, strengthen percentage elongation and can worsen properties of product undoubtedly.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of low acid consumption to pass through the technical program with heat for cold belt product made from steel production method, the combination of planisher, multi-roll straightening machine, brushing device is adopted to substitute traditional withdrawal straightening machine, reduce the necessary large percentage elongation of withdrawal straightening machine scale breading, under the prerequisite of not influence zone Steel Properties, strengthen mechanical scale breading, scale removal effect, to make after processing quantity of formation on belt steel surface oxide many, and be permanent oxide crackle.On this basis, by the oxide scrubbing middle scrubbing roller and remove further belt steel surface, reduce the oxide aggregate entered in pickling, reach the effect promoting pickling efficiency, reduce acid consumption; Reduce the percentage elongation needed for withdrawal straightening machine scale breading, dimension, avoid the luders band defect of belt steel surface when common Hot Rolling Plate Production; When high-strength steel, IF rigidity are produced, reduce the performance losses of product.
In order to achieve the above object, technical scheme of the present invention is achieved in that a kind of low acid consumption with heat for cold belt product made from steel production method, specifically comprises the steps:
A. uncoiler uncoiling
B. planisher planisher carries out fragmentation, stripping to the oxide of belt steel surface;
C. multi-roll straightening machine is to broken, the stripping further of the oxide of belt steel surface;
D. the scrubbing roller in brushing device removes the oxide that belt steel surface comes off and loosens;
E. pickling, rinsing is carried out by through smooth, the band steel aligned and scrub after process;
F. through polishing machine, even surface roughness process is carried out to the product after rinsing;
G. the strip coiling after process is become finished product by coiling machine.
Production method of the present invention is by flattening process, multiple roll straightening process, scrub technique, acid cleaning process, rinsing process, finishing process combine, after processing uncoiler, be configured with planisher, process equipment that multi-roll straightening machine, brushing device three cover possess scale breading, de-scaling function, treated band steel enters acid tank again and carries out pickling processing, finally the band steel after pickling is carried out to the skin processing of even surface roughness again.
In technical scheme of the present invention, comprise three mechanical type scale breadings, de-scaling functions, first by planisher, fragmentation is carried out to the oxide of belt steel surface, then the multi-roll straightening machine utilizing planisher to export carries out repeatedly forward and reverse bending to broken oxide, further broken oxide, finally utilize brushing device to carry out oxide removing to belt steel surface, three complete equipment coordinated, remove the oxide of Surfaces of Hot Rolled Strip as much as possible.
The present invention has shortening acid reaction time function, described band steel is after the secondary scale breading, brushing device de-scaling of a scale breading of planisher, multi-roll straightening machine, permanent, large scale oxide crackle is defined at belt steel surface, now enter again in pickling and carry out chemical de-scaling, because belt steel surface possesses large scale oxide crackle, acid solution can rapid osmotic be reacted to FeO layer, and the pickling time of straight carbon steel is shortened to 10-12s by the 16-22s of routine; Dual phase steel pickling time in high-strength steel is shortened to 20-25s by 35-45s.
In technical scheme of the present invention, have the function reducing acid consumption, described band steel, after planisher scale breading, multi-roll straightening machine secondary scale breading, brushing device de-scaling, removes belt steel surface partial oxide, decreases chemical reaction amount, reduces acid consumption.
In technical scheme of the present invention, comprise the breaking elongation controlling functions of scale breading process, while belt steel surface oxide removed by planisher, by planisher roll-force dynamic adjustment function, control the breaking elongation of planisher and multi-roll straightening machine, and then ensure the performance of institute's rapidoprint.
The present invention has under the prerequisite of not influence zone Steel Properties, remove the function of belt steel surface oxide, the combination of planisher, multi-roll straightening machine and brushing device, can when being with steel percentage elongation to be 0.8%-1.5%, permanent, large-sized oxide crackle is formed at belt steel surface, complete chemical surface treatment fast, avoid common hot-rolled product and produce luders band defect; High-strength steel, IF Steel Properties is avoided to worsen.
Technical scheme of the present invention, comprise secondary plate shape and improve function, be with steel tentatively to improve after plate shape through planisher and enter multi-roll straightening machine, and adjust the registration of smoothing roll up and down of multi-roll straightening machine according to belt steel thickness and material, thus improve plate shape and thickness and precision further
In technical scheme of the present invention, comprise the smooth scale breading step of a band elongation control function, in formation process, the band steel body tissue extending very capable is attempted to extend forward under roll-force effect, and the Fe of belt steel surface
2o
3, Fe
3o
4organize poor ductility, cannot follow band steel and synchronously extend, thus cause between oxide on surface and band steel body tissue and produce horizontal tangential power, this tangential force impels oxide on surface to peel off from belt steel surface; Meanwhile, the upper working rolls and lower working rolls in planisher is compressive zone steel under the effect of roll-force, by the oxide pressure break of belt steel surface, forms many fine and closely woven and oxide crackles that direction is random.
In technical scheme of the present invention, comprise an aligning scale breading de-scaling step, to process through planisher, oxide on surface sends into multi-roll straightening machine with the band steel of fine and closely woven oxide crackle align, in straightening process, the band steel with fine and closely woven oxide crackle is carried out repeatedly forward and reverse bending by smoothing roll, makes belt steel surface be flattened the oxide of machine pressure break broken further.
Beneficial effect after employing technique scheme is: a kind of low acid consumes with heat for cold belt product made from steel production method, by the technical program compared with prior art, after 1 process, the quantity of belt steel surface oxide crackle is more, and the gap of oxide crackle is large, facilitate the acid solution rapid osmotic in acid cleaning process, can significantly promote pickling efficiency; 2 scrub technique will be separated with band steel body but still unpeeled oxide is removed further, stop band steel body and to be separated but still unpeeled oxide enters into acid tank again reacts, thus greatly reduced acid reaction amount, reduce acid consumption; After 3 processing, band steel yield strength value added is low, and strip property is substantially unaffected; 4 eliminate the yield point elongation of band steel by flattening process processing, avoid the luders band having stopped often to be formed at common hot rolling product surface.
Accompanying drawing explanation
Fig. 1 is conventional pickling withdrawal straightening stands schematic diagram in prior art.
Fig. 2 is the view of hot-strip straightening front and rear surfaces iron scale in prior art.
Fig. 3 is the luders band sample picture that in prior art, common hot rolled plate surface often produces after straightening.
Fig. 4 is process equipment layout drawing of the present invention.
Fig. 5 is flattening process in the present invention, aligning scale breading technique and scrub the equipment structure chart of technique.
Fig. 6 is the percentage elongation of flattening process in the present invention is belt steel surface oxide crackle picture under 0.8%-1.5% state.
In figure, 1 uncoiler, 2 entry loops, 3 withdrawal straightening machines, 4 pickling, 5 outlet loopings, 6 coiling machines, 7 band steel, 8 oxides, 9 oxide crackles, 10 luders bands, 11 planishers, 12 multi-roll straightening machines, 13 working rolls, 14 smoothing rolls, 15 brushing devices, 16 scrubbing rollers, polishing machine 22,30 rinsing.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment in the present invention is described in further detail.
As shown in Figure 4 and Figure 5, the low acid consumption of the one that the present invention relates to, specifically comprises the steps: for cold belt product made from steel production method with heat
A. uncoiler 1 uncoiling;
B. the oxide 8 of planisher 11 to band steel 7 surface carries out fragmentation, stripping;
C. multi-roll straightening machine 12 is to broken, the stripping further of the oxide 8 on band steel 7 surface;
D. the scrubbing roller 16 in brushing device 15 removes the oxide 8 that band steel 7 surface comes off and loosens;
E. pickling 4, rinsing 30 is carried out by through smooth, the band steel 7 aligned and scrub after process;
F. through polishing machine 22, even surface roughness process is carried out to the product after rinsing 30;
G. the band steel 7 after process batches by coiling machine 6 becomes finished product.
Production method described in the present invention is by flattening process, multiple roll straightening process, scrub technique, acid cleaning process, finishing process combine, after processing uncoiler 1, be configured with planisher 11, process equipment that multi-roll straightening machine 12, brushing device 15 3 cover possess scale breading, de-scaling function, treated band steel 7 enters acid tank again to carry out pickling 4 and processes, and finally carries out the uniform skin processing of roughness to the band steel 7 after pickling 4 again.
In technical scheme of the present invention, comprise three mechanical type scale breadings, de-scaling functions, first fragmentation is carried out by the oxide 8 of planisher 11 to band steel 7 surface, then the multi-roll straightening machine 12 utilizing planisher 11 to export carries out repeatedly forward and reverse bending to broken oxide 8, further broken oxide 8, finally utilize brushing device 15 to carry out oxide 8 to band steel 7 surface to remove, three complete equipment coordinated, remove the oxide 8 on hot-strip 7 surface as much as possible.
The present invention has shortening acid reaction time function, described band steel 7 is after the secondary scale breading, brushing device 15 de-scaling of a scale breading of planisher 11, multi-roll straightening machine 12, permanent, large scale oxide crackle is defined on band steel 7 surface, now enter again in pickling 4 and carry out chemical de-scaling, because band steel 7 surface possesses large scale oxide crackle, acid solution can rapid osmotic be reacted to FeO, and pickling 4 time of straight carbon steel is shortened to 10-12s by the 16-22s of routine; Dual phase steel pickling 4 time in high-strength steel is shortened to 20-25s by 35-45s.
In technical scheme of the present invention, have the function reducing acid consumption, described band steel 7, after planisher 11 scale breadings, multi-roll straightening machine 12 2 scale breadings, brushing device 15 de-scaling, removes band steel 7 surface portion oxide 8, decrease chemical reaction amount, reduce acid consumption.
In technical scheme of the present invention, comprise the breaking elongation controlling functions of scale breading process, while band steel 7 oxide on surface 8 removed by planisher 11, by planisher 11 roll-force dynamic adjustment function, control the breaking elongation of planisher 11 and multi-roll straightening machine 15, and then ensure the performance of institute's rapidoprint.
The present invention has under the prerequisite of not influence zone steel 7 performance, remove the function of band steel 7 oxide on surface 8, the combination of planisher 11, multi-roll straightening machine 12 and brushing device 15, can when being with steel 7 percentage elongation to be 0.8%-1.5%, permanent, large-sized oxide crackle is formed on band steel 7 surface, complete chemical surface treatment fast, avoid common hot-rolled product and produce luders band 10 defect; High-strength steel, IF Steel Properties is avoided to worsen.
Technical scheme of the present invention, comprise secondary plate shape and improve function, band steel 7 tentatively improves after plate shape through planisher 11, enters multi-roll straightening machine 12, and adjust smoothing roll up and down 14 registration of multi-roll straightening machine 12 according to band steel 7 thickness and material, thus improve plate shape and thickness and precision further.
In technical scheme of the present invention, comprise the smooth scale breading step of a band elongation control function, in formation process, the band steel body tissue extending very capable is attempted to extend forward under roll-force effect, and the Fe of belt steel surface
2o
3, Fe
3o
4organize poor ductility, band steel cannot be followed synchronously extend, thus cause between oxide on surface and band steel body tissue and produce horizontal tangential power, this tangential force impels oxide on surface 8 from band steel 7 sur-face peeling, simultaneously, upper working rolls and lower working rolls 13 in planisher 11 compressive zone steel 7 under the effect of roll-force, will oxide 8 pressure break on band steel 7 surface, forms many fine and closely woven and oxide crackles 9 that direction is random.
In technical scheme of the present invention, comprise an aligning scale breading de-scaling step, to process through planisher 11, oxide on surface 8 sends into multi-roll straightening machine 12 with the band steel of fine and closely woven oxide crackle 9 align, in straightening process, the band steel with fine and closely woven oxide crackle 9 is carried out repeatedly forward and reverse bending by smoothing roll 14, makes band steel 7 surface be flattened oxide 8 fragmentation further of machine 11 pressure break.
At work, the band steel 7 on uncoiler 1 is connected with the band steel 7 on entry loop 2 through welding, and first band steel 7 enters into planisher 11, due to the Fe of band steel 7 oxide on surface 8 in the present invention
2o
3, Fe
3o
4the ductility of tissue is poor, add man-hour carrying out planisher 11, band steel 7 body tissue extending very capable is attempted to extend forward under roll-force effect, this trend is subject to the restriction of the poor oxide on surface of ductility 8, therefore between oxide on surface 8 and band steel 7 body tissue, produce horizontal tangential power, help oxide on surface 8 from band steel 7 sur-face peeling; Meanwhile, the compressive zone steel 7 under the effect of roll-force of the working roll 13 in planisher 11, and will oxide 8 pressure break on band steel 7 surface, form many fine and closely woven and oxide crackles 9 that direction is random.
After the band steel 7 having a fine and closely woven oxide crackle 9 when surface leaves planisher 11, enter into multi-roll straightening machine 12 and carry out secondary scale breading, smoothing roll 14 in multi-roll straightening machine 12 makes band steel 7 produce forward and reverse bending repeatedly, each Forging Process with steel 7 makes band steel 7 surface be flattened the oxide 8 further fragmentation of machine 11 pressure break, oxide crackle 9 on band steel 7 oxide on surface is increased further, the oxide 8 simultaneously making part be separated with band steel 7 body tissue in planisher 11 directly comes off, oxide 8 structure on band steel 7 surface forms permanent oxide crackle 9, this oxide crackle 9 is still retained in band steel 8 surface after band steel 7 elastic recovery, after band steel 7 enters pickling 4, acid solution can rapid osmotic be reacted to FeO layer.
After planisher 11 and the straight machine 12 of multiple roll sedan-chair, the scrubbing roller 16 of brushing device 15 is entered into steel 7, under the rotation of scrubbing roller 16, wire bristle on scrubbing roller 16 constantly scrubs band steel 7 surface, and extend in the crack of oxide 8, will to be separated with band steel 7 body but still unpeeled oxide 8 is removed further.
Through planisher 11, band steel 7 after multi-roll straightening machine 12 and brushing device 15, enter into pickling 4 and carry out chemical surface treatment, owing to being with the oxide crackle 9 that on the oxide 8 on steel 7 surface, quantity of formation is numerous, and, oxide crackle 9 gap is larger, acid solution can rapid osmotic react to FeO layer, due in the present invention, band steel 7 after smooth has carried out multiple roll aligning and has scrubbed processing, remove the oxide 8 on part band steel 7 surface, decrease the reacting dose of pickling 4, reaction time and acid solution consumption, experimental data shows, after the combined treatment process process in the present invention, pickling efficiency can be made to improve 30%-50%, acid solution consumption reduces 30%-40%.
Because the present invention manufactures oxide crackle 9 by mechanical combination mode on the oxide 8 on band steel 7 surface, the oxide crackle 9 formed number and oxide crackle 9 size with band steel 7 plastic deformation amount have nothing to do, and the percentage elongation positive correlation of the increase of yield strength with steel 7 and band steel 7, the deflection used in process is less, fewer to the performance compromise of product after processing, therefore, smooth straightening process is compared with traditional straightening technique, there is following feature, can under the prerequisite not damaging band steel 7 performance, the oxide 8 on band steel 7 surface manufactures oxide crackle, improve pickling efficiency.
In the application of common hot rolling product scope, due to common hot-rolled product organize interstitial atoms carbon, the content of nitrogen is greater than 30ppm, therefore, very easily luders band 10 defect is formed on band steel 7 surface in processing and follow-up use procedure, and planisher 11 can the yield point elongation of cancellation band steel 7, avoids the generation of luders band defect.
As shown in Figure 6, at high-strength steel, the application in IF product made from steel field, high-strength steel, IF steel is in whole processing interval, yield strength all unidirectional increases with the increase of process deflection of product, in order to not damage material property, strictly percentage elongation must be limited during production, cause pickling efficiency extremely low, for the dual phase steel in high-strength steel, general pickling time is between 35s-45s, therefore, the pickling efficiency how promoting the said goods in deflection little is as far as possible a large technical barrier of this series products, the present invention can not occur or only produce very little plastic deformation, generally, pickling efficiency is improved under the condition of 0.8%-1.5%, the pickling time of pickling 4 is shortened 10-20s, substantially increase operating efficiency, and solve high-strength steel in carbon steel, the a great problem that IF steel is produced.
In embodiments of the invention, the working roll 13 in described planisher 11, multi-roll straightening machine 12, brushing device 15 and polishing machine 22, smoothing roll 14 and scrubbing roller 16 are prior art, and in this its structure, it is no longer repeated.
The above, be only better possible embodiments of the present invention, and be not used to limit protection scope of the present invention.
Claims (10)
1. low acid consumption is with heat for a cold belt product made from steel production method, it is characterized in that, specifically comprises the steps:
A. uncoiler uncoiling;
B. planisher carries out fragmentation, stripping to the oxide of belt steel surface;
C. multi-roll straightening machine is to broken, the stripping further of the oxide of belt steel surface;
D. the scrubbing roller in brushing device removes the oxide that belt steel surface comes off and loosens;
E. pickling, rinsing is carried out by through smooth, the band steel aligned and scrub after process;
F. through polishing machine, even surface roughness process is carried out to the product after rinsing;
G. the strip coiling after process is become finished product by coiling machine.
2. the low acid of one according to claim 1 consumes with heat for cold belt product made from steel production method, it is characterized in that, described production method by flattening process, multiple roll straightening process, scrub technique, acid cleaning process, rinsing process, finishing process combine, after processing uncoiler, be configured with planisher, process equipment that multi-roll straightening machine, brushing device three cover possess scale breading, de-scaling function, treated band steel enters acid tank again and carries out pickling processing, finally the band steel after rinsing is carried out to the skin processing of even surface roughness again.
3. the low acid consumption of one according to claim 2 is with heat for cold belt product made from steel production method, it is characterized in that, comprises three mechanical type scale breadings, de-scaling functions, first carry out fragmentation by planisher to the oxide of belt steel surface; Then the multi-roll straightening machine utilizing planisher to export carries out repeatedly forward and reverse bending, further broken oxide to broken oxide; Finally utilize brushing device to carry out oxide removing to belt steel surface, three complete equipment coordinated, remove the oxide of Surfaces of Hot Rolled Strip as much as possible.
4. the low acid of one according to claim 3 consumes with heat for cold belt product made from steel production method, it is characterized in that, have and shorten acid reaction time function, described band steel is after the secondary scale breading, brushing device de-scaling of a scale breading of planisher, multi-roll straightening machine, permanent, large scale oxide crackle is defined at belt steel surface, now enter again in pickling and carry out chemical de-scaling, because belt steel surface possesses large scale oxide crackle, acid solution can rapid osmotic be reacted to FeO layer, and the pickling time of straight carbon steel is shortened to 10-12s by the 16-22s of routine; Dual phase steel pickling time in high-strength steel is shortened to 20-25s by 35-45s.
5. the low acid of one according to claim 3 consumes with heat for cold belt product made from steel production method, it is characterized in that, there is the function reducing acid consumption, described band steel is after planisher scale breading, multi-roll straightening machine secondary scale breading, brushing device de-scaling, remove belt steel surface partial oxide, decrease chemical reaction amount, reduce acid consumption.
6. the low acid of one according to claim 3 consumes with heat for cold belt product made from steel production method, it is characterized in that, comprise the breaking elongation controlling functions of scale breading process, while belt steel surface oxide removed by planisher, by planisher roll-force dynamic adjustment function, control breaking elongation that is smooth, multiple roll straightening section, ensure the performance of institute's rapidoprint.
7. the low acid of one according to claim 3 consumes with heat for cold belt product made from steel production method, it is characterized in that, have under the prerequisite of not influence zone Steel Properties, remove the function of belt steel surface oxide, the combination of planisher, multi-roll straightening machine and brushing device, when being with steel percentage elongation to be 0.8%-1.5%, can form permanent, large-sized oxide crackle at belt steel surface, complete chemical surface treatment fast, avoid common hot-rolled product and produce luders band defect; High-strength steel, IF Steel Properties is avoided to worsen.
8. the low acid of one according to claim 3 consumes with heat for cold belt product made from steel production method, it is characterized in that, comprise secondary plate shape and improve function, band steel tentatively improves after plate shape through planisher, enter multi-roll straightening machine, and adjust the registration of smoothing roll up and down of multi-roll straightening machine according to belt steel thickness and material, thus improve plate shape and thickness and precision further.
9. the low acid of one according to claim 3 consumes with heat for cold belt product made from steel production method, it is characterized in that, comprise the smooth scale breading step of a band elongation control function, in formation process, extend under very capable band steel matrix is organized in roll-force effect and attempt to extend forward, and the Fe of belt steel surface
2o
3, Fe
3o
4organize poor ductility, band steel cannot be followed synchronously extend, thus cause between oxide on surface and band steel matrix tissue and produce horizontal tangential power, this tangential force impels oxide on surface to peel off from belt steel surface, simultaneously, upper working rolls and lower working rolls in planisher is compressive zone steel under the effect of roll-force, by the oxide pressure break of belt steel surface, forms many fine and closely woven and oxide crackles that direction is random.
10. the low acid of one according to claim 3 consumes with heat for cold belt product made from steel production method, it is characterized in that, comprise an aligning scale breading de-scaling step, to process through planisher, oxide on surface sends into multi-roll straightening machine with the band steel of fine and closely woven oxide crackle align, in straightening process, the band steel with fine and closely woven oxide crackle is carried out repeatedly forward and reverse bending by smoothing roll, makes belt steel surface be flattened the oxide of machine pressure break broken further.
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