CN103372567A - Method for producing ferritic stainless steel bands with roughened surfaces through cold continuous rolling - Google Patents
Method for producing ferritic stainless steel bands with roughened surfaces through cold continuous rolling Download PDFInfo
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Abstract
A method for producing ferritic stainless steel bands with roughened surfaces through cold continuous rolling comprises that (1), a five-rack serial type cold continuous rolling is performed, a five-rack serial type cold continuous rolling unit is adopted, the diameter of a working roll of each rolling mill is 300-500mm, and endless rolling is performed; the roughness degrees of the rolls of the first rack to the fourth rack are in a range of 0.5-1.0mum and decrease sequentially; the working roll of the fifth rack is subjected to roughening and chromium plating treatment; an emulsion lubrication rolling mode is adopted, the temperature of an emulsion is 50-60DEG C, the emulsion is sprayed to roll gaps for cooling and lubricating, the temperature of cold-rolled band steel is controlled below 150DEG C; the accumulated reduction rate of the first rack to the fourth rack is larger than 60%, the reduction rate of the fifth rack is in a range of 4-10%, and the roughness of the cold-rolled band steel is controlled in a range of 0.5-1.0mum; (2), the cold-rolled band steel is subjected to annealing acid picking treatment, heating and annealing are performed in a continuous horizontal gas furnace, the annealing temperature is in a range of 800-1000DEG C, and recrystallization of the band steel is finished; finished surfaces are obtained finally through electrolytic picking by Na2SO4 and H2SO4 solutions and soaking picking by a nitric acid and hydrofluoric acid mixed acid solution sequentially after annealing.
Description
Technical field
The present invention relates to stainless steel material and manufacture method thereof, particularly a kind of method of cold continuous rolling production texturing surface ferrite stainless steel band
Background technology
According to standard GB/T 3280-2007 " cold rolled stainless steel sheet and steel band " regulation, stainless Surface Machining type comprises the 2D surface, 2B is surperficial, BA is surperficial, 3# is surperficial, HL is surperficial etc.Wherein the 2D surface processing technique is to heat-treat and pickling after cold rolling, obtains matt surface, again through the smooth texturing surface product that obtains of dull roll.But because this production technology need to be carried out an independently smooth operation of dull roll after cold rolling, can bring the decline of lumber recovery and the rising of production cost.
Because texturing surface stainless steel has inferior light characteristic, thereby is widely used in the industries such as building roof, interior decoration and meal kitchen tool.Because the larger hair side stainless steel of roughness can provide larger surface adhesion force, be fit to carry out follow-up surface treatment simultaneously, brought advantage for the operations such as plating and coating.
Referring to Fig. 1, the production procedure of traditional texturing surface ferrite stainless steel band comprises: hot-roll annealing pickling volume 10 → multi-roll mill reversible rolling 20 → cold coiling annealing and pickling 30 → smooth 40 → finished product steel belt 50.
Also introduced the method that adopts 20 roller reversable cold-rolling machines to produce the hair side stainless steel band just like Chinese patent CN101244427A " method for producing textured surface accurate stainless steel band " and CN101537425A " a kind of cold-rolling process of corrosion resistant plate of frosting ", it is reversible cold rolling that its Patent CN101244427A uses 20 rollers, in the end a passage adopts hair rolling system, the material W6Mo5Cr4V2 of working roll, be that the sand of 46-100 carries out sandblast texturing and processes the texturing surface stainless steel belt that rolling rear acquisition rough surface Ra is 0.5-1.0 with granularity; The working roll roughness Ra that patent CN101537425A adopts is 0.3-0.8 μ m, and the band steel is that the planisher of 0.4-0.5 μ m is smooth through gloss level of roll through bright annealing again behind the reversible rolling, obtains texturing surface stainless steel product.
Adopt 20 roll reversing roller production texturings surface stainless steel method, if increase cold rolling after-baking and smooth operation, then cost increases and the lumber recovery reduction; Even do not increase cold rolling after-baking and the operation such as smooth, because the work roll diameter of mill itself is less, surface texturing decorative pattern periodicity is comparatively obvious, and the texturing effect is not satisfactory.The present invention is a kind of method of cold continuous rolling production texturing surface ferrite stainless steel band, owing to do not increase heat treatment and the operation such as smooth so that production efficiency improves, adopt simultaneously the surface through the big roller footpath working roll of electric spark and chromium plating processing, obtain the respond well stainless steel product of surface texturing.
Summary of the invention
The objective of the invention is to propose a kind of method of cold continuous rolling production texturing ferritic stainless steel band, its hot-rolled stainless steel steel band that adopts the conventional annealing pickling is raw material, adopt five Stands Cold Tandem Mill groups to carry out continuous cold rolling, spray emulsion and be lubricated rolling at operation of rolling roll gap place, the working roll of tandem mills is the Cr5 forged steel, obtains the surface roughness and the anti-wear performance that require after the process texturing of the 5th frame work roll surface and chromium plating are processed.The present invention not only can bring into play the high efficiency characteristics of tandem rolling unit greatly, and can reduce production process, improves lumber recovery and qualification rate, reduces production costs.
For achieving the above object, technical scheme of the present invention is:
A kind of method of cold continuous rolling production texturing surface ferrite stainless steel band, it comprises the steps:
1) five frame tandem cold continuous rollings
Adopt five frame tandem tandem mills, the operation roll of mill roller directly is 300～500mm, and the raw band steel carries out laser weld at the unit entrance, makes front and back band steel from beginning to end, realizes endless rolling;
The working roll of milling train adopts the forged steel material, and the gloss level of roll of Shore hardness 〉=90, first to fourth frames is at 0.5～1.0 μ m, and reduces successively; The working roll of the 5th frame is processed through texturing and chromium plating, and the roughness after its grinding is 0.5～1.5 μ m, and texturing is processed and adopted electric spark texturing technique, and the gloss level of roll Ra after the texturing is between 3.0～4.0 μ m, and peak value is between 55～80peaks/cm; Roll after the texturing carries out chromium plating to be processed, and chromium coating is the be full of cracks structure, and thickness of coating is controlled at 5-10 μ m;
Rolling employing emulsion lubrication is rolling, and the emulsion temperature is controlled at 50～60 ℃, and emulsion is ejected into the effect that Cooling and Lubricator is played at the roll gap place, and the belt steel temperature after cold rolling is controlled at below 150 ℃; The accumulative total reduction ratio of first to fourth frame, is controlled at the roughness of cold-strip steel between 0.5～1.0 μ m 4～10% greater than the reduction ratio of 60%, the five frame;
2) carry out annealing and pickling through the band steel after cold rolling and process, heating anneal in the continuous horizontal type gas furnace, 800～1000 ℃ of annealing temperatures are finished the recrystallization with steel; Priority is through Na after the annealing
2SO
4Solution and H
2SO
4Electrolysis of solutions pickling and nitric acid hydrofluoric acid mixed acid solution soak acid-cleaning obtain final finished surface.
Further, described working roll adopts 5Cr forged steel material.The working roll width is 1200～2000mm, and maximum rolling force is greater than 20000kN.
In addition, described emulsion is oil-in-water emulsion, and its dynamic viscosity (40 ℃) is at 50～100mm
2Between/the s, oil concentration is 2～10wt%.
In the inventive method,
Adopting the working roll roller directly is the five frame connection rolling machine group of 300～500mm, can realize high efficiency production, and maximum mill speed surpasses 500m/min.Adopt laser welder to connect front and back band steel, can avoid not rolling section end to end in the reversible rolling, improve lumber recovery about 3%.
Adopt the electric spark roughing method that the working roll of 5Cr forged steel material is carried out texturing and process, can control the texturing effect and optimize by parameters such as pulse width, pulse spacing, peak point currents, have efficient, stable, controlled characteristics.Roll after the texturing can prolong after chromium plating is processed more than its rolling milimeter number to 50 kilometer.
Employing concentration is that the high viscosity oil-in-water emulsion of 2～10wt% is rolling, at the cooling roll and when being with steel, form the oil film of stable high extreme pressure property, can avoid ferritic stainless steel that the blemish such as heat scuffing occur in continuous rolling process, guarantee surface quality.
By controlling the distribution of depressing of each frame, can guarantee surface texturing pattern with the 5th frame working roll good copy to belt steel surface, will roll hard steel volume roughness and be controlled between 0.5～1.0 μ m.Referring to Fig. 3, Fig. 4.
Through after 800～1000 ℃ the recrystallization annealing, material obtains good mechanics and corrosive nature when having good texturing surface after rolling.
Priority is through Na after the annealing
2SO
4Solution and H
2SO
4Electrolysis of solutions pickling and nitric acid hydrofluoric acid mixed acid solution soak acid-cleaning can be removed the iron scale that flash annealing generates, and eliminate the metallic luster of belt steel surface, obtain the final finished of matt surface.
Beneficial effect of the present invention:
Adopt production method of the present invention, namely carry out the ferritic stainless steel steel band that mao rolling system obtains the texturing surface through the tandem continuous-rolling, not only have preferably surface quality, dimensional accuracy and plate shape, and with traditional texturing surface production to compare process flow simpler, reduced cold rolling smooth operation afterwards, in the situation that guarantees product mechanical property and surface quality, greatly improved lumber recovery and qualification rate, reduced production cost.This method can be widely used in the production of ferritic stainless steel.
Description of drawings
Fig. 1 is traditional texturing surface stainless steel production method.
Fig. 2 is the schematic diagram of technological process of the present invention.
Fig. 3, Fig. 4 are the stereoscan photograph of texturing surface ferrite stainless steel surface topography of the present invention.
The specific embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Referring to Fig. 2, technological process of the present invention: hot-roll annealing pickling volume 1 → five frame tandem cold continuous rolling 2 → cold coiling annealing and pickling 3 → finished product steel belt 4.
Embodiment 1
Thickness be the hot rolling stock roll of 4.0mm when five frame tandem cold-mill groups are rolling, strictly control work roll surface roughness and the reduction ratio of each frame.The working roll width of milling train is 1780mm, and diameter is 450mm, and maximum rolling force is 27000kN.Working roll is through 80 order abrasion wheel grindings, and the roll surface roughness of the first to the 4th frame is respectively 0.93 μ m, 0.88 μ m, 0.72 μ m, 0.55 μ m, and the reduction ratio of the first to five frame is respectively 26.3%, 25.9%, 22.3%, 20.2%, 3.5%.The Grinding Roughness of the 5th frame working roll is 1.2 μ m.Gloss level of roll Ra after the texturing is 3.8 μ m, and peak value is 60peaks/cm.Roll after the texturing carries out chromium plating to be processed.The oil-in-water emulsion dynamic viscosity that uses (40 ℃) is 60mm
2/ s, oil concentration is 2.3wt%, rolls rear band steel and is cooled to 90 ℃.The outlet mill speed is 500m/min.Belt steel surface roughness after rolling is 0.7 μ m, and the final products surface roughness after 880 ℃ of annealing and pickling processes is 0.9 μ m.
Embodiment 2
Thickness be the hot rolling stock roll of 3.0mm when five frame tandem cold-mill groups are rolling, strictly control work roll surface roughness and the reduction ratio of each frame.The working roll width of milling train is 1780mm, and diameter is 400mm, and maximum rolling force is 27000kN.Operation roll of mill is through 80 order abrasion wheel grindings, the roll surface roughness of the first to the 4th frame is respectively 1.04 μ m, 0.86 μ m, 0.75 μ m, 0.51 μ m, and the reduction ratio of the first to five frame is respectively 32.2%, 34.1%, 27.4%, 25.2%, 4.0%.The Grinding Roughness of the 5th frame working roll is 1.1 μ m.Gloss level of roll Ra after the texturing is 3.6 μ m, and peak value is 71peaks/cm.Roll after the texturing carries out chromium plating to be processed.The emulsion dynamic viscosity that uses (40 ℃) is 70mm
2/ s, concentration is 4.1wt%, rolls rear band steel and is cooled to 95 ℃.The outlet mill speed is 650m/min.Belt steel surface roughness after rolling is 0.65 μ m, through 960 ℃ of annealing of annealing temperature, and the surface roughness 0.74 μ m of final products after the annealing and pickling unit is processed.
Embodiment 3
The hot rolling stock roll of thickness 6.0mm will strictly be controlled work roll surface roughness and the reduction ratio of each frame when five frame tandem cold-mill groups are rolling.The working roll width of milling train is 1420mm, and diameter is 300mm, and maximum rolling force is 23000kN.Operation roll of mill is through 80 order abrasion wheel grindings, the roll surface roughness of the first to the 4th frame is respectively 1.21 μ m, 0.91 μ m, 0.73 μ m, 0.43 μ m, and the reduction ratio of the first to five frame is respectively 33.3%, 22.5%, 16.1%, 15.4%, 9.1%.The Grinding Roughness of the 5th frame working roll is 1.2 μ m.Gloss level of roll Ra after the texturing is 3.8 μ m, and peak value is 58peaks/cm.Roll after the texturing carries out chromium plating to be processed.The emulsion dynamic viscosity that uses (40 ℃) is 95mm
2/ s, concentration is 8.3wt%, rolls rear band steel and is cooled to 120 ℃.The outlet mill speed is 600m/min.Belt steel surface roughness after rolling is 0.85 μ m, through 990 ℃ of annealing of annealing temperature, and the surface roughness 0.93 μ m of final products after the annealing and pickling unit is processed.
Adopt the present invention to make the hair side stainless steel, not only can obtain to have the preferably product of surface quality, dimensional accuracy and plate shape, and with traditional texturing surface production to compare process flow simpler, reduced cold rolling smooth operation afterwards, in the situation that guarantees product mechanical property and surface quality, greatly improve lumber recovery and qualification rate, reduced production cost.The inventive method can be widely used in the production of ferritic stainless steel.
Claims (4)
1. the method for a cold continuous rolling production texturing surface ferrite stainless steel band, it comprises the steps:
1) five frame tandem cold continuous rollings
Adopt five frame tandem tandem mills, the operation roll of mill roller directly is 300～500mm, and the raw band steel carries out laser weld at the unit entrance, makes front and back band steel from beginning to end, realizes endless rolling;
The working roll of milling train adopts the forged steel material, and the gloss level of roll of Shore hardness 〉=90, first to fourth frames is at 0.5～1.0 μ m, and reduces successively; The working roll of the 5th frame is processed through texturing and chromium plating, and the roughness after its grinding is 0.5～1.5 μ m, and texturing is processed and adopted electric spark texturing technique, and the gloss level of roll Ra after the texturing is between 3.0～4.0 μ m, and peak value is between 55～80peaks/cm; Roll after the texturing carries out chromium plating to be processed, and chromium coating is the be full of cracks structure, and thickness of coating is controlled at 5～10 μ m;
Rolling employing emulsion lubrication is rolling, and the emulsion temperature is controlled at 50～60 ℃, and emulsion is ejected into the effect that Cooling and Lubricator is played at the roll gap place, and the belt steel temperature after cold rolling is controlled at below 150 ℃; The accumulative total reduction ratio of first to fourth frame, is controlled at the roughness of cold-strip steel between 0.5～1.0 μ m 4～10% greater than the reduction ratio of 60%, the five frame;
2) carry out annealing and pickling through the band steel after cold rolling and process, heating anneal in the continuous horizontal type gas furnace, 800～1000 ℃ of annealing temperatures are finished the recrystallization with steel; Priority is through Na after the annealing
2SO
4Solution, H
2SO
4Electrolysis of solutions pickling and nitric acid hydrofluoric acid mixed acid solution soak acid-cleaning obtain final finished surface.
2. the method for cold continuous rolling production texturing surface ferrite stainless steel band as claimed in claim 1 is characterized in that described working roll width is 1200～2000mm, and maximum rolling force is greater than 20000kN, and maximum mill speed is greater than 500m/min.
3. the method for cold continuous rolling production texturing surface ferrite stainless steel band as claimed in claim 1 or 2 is characterized in that, described working roll adopts 5Cr forged steel material.
4. the method for cold continuous rolling production texturing surface ferrite stainless steel band as claimed in claim 1 is characterized in that described emulsion is oil-in-water emulsion, and its dynamic viscosity (40 ℃) is at 50-100mm
2Between/the s, oil concentration is 2～10wt%.
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