CN102658294B - The very thin steel band of toy industry mild steel precision cold-rolled, its process and uses thereof - Google Patents
The very thin steel band of toy industry mild steel precision cold-rolled, its process and uses thereof Download PDFInfo
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Abstract
The present invention relates to the production technology of the very thin steel band of mild steel precision cold-rolled, comprising: pretreatment, heat treatment, finish rolling system, stretch-bending straightening, slitting is cut and is obtained finished product.The very thin steel band of mild steel precision cold-rolled of described explained hereafter has certain roughness, and surface printing layer or protective layer firmly do not come off; Plate shape glacing flatness is high, easy-formation; Thickness is below 0.08mm, even can reach below 0.06mm, can be used for the production of the steel article needing coating pigment or protective layer.
Description
Technical field
The present invention relates to mild steel cold-rolled strip field, particularly, the present invention relates to the very thin steel band of mild steel precision cold-rolled, its production technology and uses thereof.
Background technology
In the production process of many industries, need very thin and there is certain roughness, the steel band of difficult drop-off after dyeing.Such as, current domestic toy industry low-carbon cold rolling steel band used is general surface, and it is thick that thickness is greater than 0.10mm, and plate shape belongs to the steel band of common grade, and usually adopt six rollers and above mill milling, two-high dressing mill improves the explained hereafter of plate shape.Along with the development of toy industry, entered intellectuality, automation, miniaturization, colouring, traditional mild steel cold-rolled strip cannot satisfy the demands.In recent years, in this area, large quantity research has been made to precise paper-thin steel band.
CN 1709597A discloses a kind of high-precision very-thin special-wide cold-rolled steel band and processing technology thereof, is specifically widely used in the plate material in high-energy rechargeable battery, belongs to electrode substrate for battery field of material technology.It mainly adopts the hot-rolled strip coiled strip through pickling cold rolling through first rolling process, then through trimming, degreasing, annealing heat treatment, then it is thick to be cold-rolled to 0.035-0.055mm through second rolling process, can be undertaken being cut to finished product by user's requirement finally by after stretch-bend leveller.This product thickness and glacing flatness meet current needs, but its smooth surface, not easily paint, and easily come off after surface printing.
CN 102284481A discloses a kind of production technology of ultrathin cold-rolled deep drawing steel strap, be widely used in battery production industry, comprise the following steps, a, select materials: selection cold rolling coil is raw material, b, finish rolling: utilize four roller high accuracy reversable mills to carry out finish rolling to cold rolling coil raw material, c, spray degreasing: utilize degreasing unit to carry out spray degreasing process to the steel band after finish rolling, d, annealing: bell-type annealing process is carried out to the steel band after degreasing, e, smooth: to adopt two-high dressing mill to carry out dry type the steel band after bell-type annealing process smooth, f, stretch-bending straightening: adopt withdrawal straightening machine to carry out stretch-bending straightening to smooth rear steel band, g, cutting: the finished product steel band after stretch-bending straightening being cut into various width requirement.The product thickness of this technique and glacing flatness meet current needs, but there is smooth surface equally, not easily paint, and caducous problem after surface printing.
Therefore, develop a kind of thickness requirement very thin, have certain roughness, firmly do not come off after surface printing, the precise stainless steel strip that plate shape glacing flatness is high is the difficult problem of this area.
Summary of the invention
For the deficiencies in the prior art, an object of the present invention is the production technology providing the very thin steel band of a kind of mild steel precision cold-rolled.Described technique comprises the following steps:
(1) pretreatment;
(2) heat treatment: the steel band that step (1) obtains is carried out annealing in process at 500 ~ 700 DEG C;
(3) finish rolling system: adopt roughness to be the working roll of Ra0.1 ~ 0.7 μm, the steel band essence that step (2) obtains is rolling to below 0.08mm thickness, and roll-force is 200 ~ 900 tons;
(4) stretch-bending straightening: steel band step (3) obtained adopts the straight technique of the permanent extension of straightening combination to carry out stretch-bending straightening process;
(5) slitting is cut: the steel band sub-cut that step (4) obtains is finished product by width as requested.
Preferably, described in step (1), pretreatment comprises:
(1 ') peels off, pickling: with thickness be the mild steel hot rolled coil of 1.0 ~ 4.5mm for raw material, carry out uncoiling, mechanical descaling, pickling, passivation, drying, rolling successively by after its sub-cut;
(2 ') roughing system: steel band rolling step (1 ') obtained is 0.20 ~ 0.40mm;
(3 ') loose winding, degreasing, dry: steel band step (2 ') obtained carries out uncoiling, then degreased surface, final drying, rolling.
Preferably, the thickness of the hot rolled coil of raw material mild steel described in step (1 ') is 2.0 ~ 3.5mm, is particularly preferably 2.75 ~ 3.0mm.
Preferably, before the post-passivation of pickling described in step (1 '), steel band is cleaned; Preferably, described cleaning sprays for adopting water; Preferably, described cleaning temperature is 5 ~ 90 DEG C, more preferably 20 ~ 70 DEG C, is particularly preferably 30 ~ 60 DEG C.
Preferably, pickling described in step (1 ') is through more than 2 groove pickling, and such as 4 grooves, 5 grooves, 6 grooves, 7 grooves, 10 grooves etc., be particularly preferably 3 groove pickling; Preferably, the pickle that described pickling adopts comprises strong acid, such as sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid etc., also can comprise other material, such as corrosion inhibiter, antifoggant, surfactant etc., those skilled in the art can select according to prior art and/or new technology, and particularly preferably described pickle is hydrochloric acid.
Preferably, described in step (1 ') during pickling, each groove pickle concentration presses steel band traffic direction order to be increased; Preferably, be 1 ~ 20% by the acid solution liquid mass percentage concentration of steel band traffic direction first groove, more preferably 3 ~ 15%, be particularly preferably 5 ~ 10%; Preferably, pickling temperature is 40 ~ 100 DEG C, more preferably 60 ~ 90 DEG C, is particularly preferably 75 ~ 80 DEG C.
Preferably, the speed of pickling described in step (1 ') is 10 ~ 80 ms/min, more preferably 30 ~ 50 ms/min, is particularly preferably 40 ms/min.
Preferably, pickling described in step (1 ') is the pickling of shallow slot immersion.
Passivation object described in step (1 ') is that later process is unlikely and gets rusty, and guarantees that surface is silvery white in color; The passivating solution that described passivation adopts is affiliated field conventional passivation liquid, the prior art that one of ordinary skill in the art can grasp according to it and/or new technology are selected, preferably, described passivating solution is nitrite solution, more preferably sodium nitrite solution, is particularly preferably the sodium nitrite solution that mass concentration is 10%.
Preferably, passivation temperature described in step (1 ') is 30 ~ 90 DEG C, more preferably 50 ~ 80 DEG C, is particularly preferably 60 ~ 70 DEG C.
Preferably, in step (1 '), after passivation, the dry front squeeze roll that adopts squeezes out raffinate.
Preferably, dry for drying described in step (1 ').
Preferably, after dry described in step (1 ') before rolling, correct through arbor press.
Preferably, step (2 ') thickness of strips after roughing system is 0.25 ~ 0.35mm, is particularly preferably 0.28 ~ 0.30mm.
Preferably, described in step (2 '), roughing system adopts more than 2 passages, and such as 3 passages, 4 passages, 5 passages, 6 passages, 9 roads are inferior.
Preferably, roughing system described in step (2 ') adopts four roller reversable cold-rolling machines, and particularly preferably adopt the four roller reversable cold-rolling machines that tape thickness AGC controls, it has high strength, large draught pressure, high stable tension force.
Preferably, roughing system described in step (2 ') adopts ROLLING OIL pH to be 5 ~ 9, is particularly preferably 6 ~ 8.
The ROLLING OIL that roughing system described in step (2 ') adopts is affiliated field pair rolling oil, preferred employing mass percent is that the C420 aqueous solution of Quaker Chemical（China）Co., Ltd.'s production of 1 ~ 15% lubricates, and is particularly preferably the C420 aqueous solution that mass percent is Quaker Chemical（China）Co., Ltd.'s production of 2 ~ 6%.
Preferably, the employing of degreasing described in step (3 ') alkaline degreasing liquid, the model preferably adopting Fine Chemical Co., Ltd of superfamily of Foshan City to produce further is the aqueous solution of F-8300, and particularly preferably employing concentration is the F-8300 aqueous solution of 20 ~ 60g/L.
Preferably, skimming temp described in step (3 ') is 30 ~ 100 DEG C, more preferably 50 ~ 80 DEG C, is particularly preferably 60 ~ 75 DEG C.
Preferably, degreasing speed described in step (3 ') is less than 80 ms/min, such as: 0.1 m/min, 0.2 m/min, 1 m/min, 2 ms/min, 5 ms/min, 10 ms/min, 15 ms/min, 25 ms/min, 35 ms/min, 50 ms/min, 70 ms/min, 75 ms/min, 78 ms/min, 79 ms/min, 79.5 ms/min, 79.9 ms/min etc., more preferably 20 ~ 60 ms/min, be particularly preferably 30 ~ 50 ms/min.
Preferably, clean before drying after degreasing described in step (3 '); Preferably, described cleaning sprays for adopting water.
Preferably, dry for drying described in step (3 ').
Preferably, rolling described in step (3 ') adopts winding tension to be 1 ~ 20kg/mm
2, more preferably 2 ~ 15kg/mm
2, be particularly preferably 4 ~ 10kg/mm
2, reach the object of loose winding, produce during to avoid annealing in process between steel band and bond, affect steel strip surface quality, steel band generation hole when even there is rolling, belt phenomenon.
Preferably, described in step (2), heat treatment temperature is 550 ~ 650 DEG C, is particularly preferably 590 ~ 610 DEG C.
Preferably, heat treatment described in step (2) adopts shield type bright annealing oven, particularly preferably adopt the shield type bright annealing oven of strong convection protective gas, owing to there being the atmosphere of strong convection to make coil of strip internal and external temperature even, stable performance after heat treatment, unanimously extending longitudinally, thus ensure that the steel band template glacing flatness after calendering is desirable, to ensure the rear steel band light of annealing, without any oxidation, thus greatly improve the surface quality of steel band; Preferably; described protective gas is reducibility gas and/or inert gas; such as: a kind in nitrogen, argon gas, helium, hydrogen or the combination of at least 2 kinds; the typical but non-limiting example of described combination has: the combination of nitrogen and helium; the combination of argon gas, helium and hydrogen; the combination etc. of nitrogen, argon gas, helium, hydrogen, the more preferably combination of nitrogen and hydrogen, being particularly preferably volume content is 25%N
2and 75%H
2and the ammonolysis craft gas of dew point up to-60 DEG C.
In step (2), steel band recovers plasticity through brightness heat treatment.
Preferably, described in step (3), finish rolling system adopts four roller reversable cold-rolling machines.
Preferably, described in step (3), finish rolling system adopts more than 2 passages, and such as 3 passages, 4 passages, 5 passages, 6 passages, 9 roads are inferior.
Preferably, in step (3), institute's employing working roll roll surface roughness is Ra0.12 ~ 0.4 μm, more preferably Ra0.15 ~ 0.3 μm, is particularly preferably Ra0.2 ~ 0.3 μm.
Preferably, in step (3), institute's employing working roll hardness is more than HS80, more preferably HS88 ~ 98, is particularly preferably HS90 ~ 95.
Preferably, after finish rolling system described in step (3), thickness of strips is 0.03 ~ 0.07mm, is particularly preferably 0.06mm.
Preferably, described in step (3), roll-force is 250 ~ 700 tons, is particularly preferably 300 ~ 600 tons.
Preferably, described in step (3), smart mill speed is 200 ~ 450 ms/min, is particularly preferably 300 ~ 350 ms/min.
Preferably, finish rolling system described in step (3) adopts the rolling of working roll positive curve, and convex value is 0.005 ~ 0.10mm, more preferably 0.01 ~ 0.08mm, is particularly preferably 0.02 ~ 0.07mm, smooth to ensure plate shape.
The ROLLING OIL that finish rolling system described in step (3) adopts is affiliated field pair rolling oil, is preferably PT-T ROLLING OIL that grand lubricating oil (China) Co., Ltd of state produces.
Preferably, described in step (4), stretch-bending straightening flexibility is 5 ~ 80mm, more preferably 10 ~ 60mm, is particularly preferably 15 ~ 50mm.
Preferably, described in step (4), stretch-bending straightening percentage elongation is 0.1 ~ 1%, more preferably 0.2 ~ 0.7%, be particularly preferably 0.3 ~ 0.5%.
Preferably, described in step (4), stretch-bending straightening speed is less than 120 ms/min, such as 0.1 m/min, 0.2 m/min, 1 m/min, 2 ms/min, 5 ms/min, 10 ms/min, 29 ms/min, 31 ms/min, 60 ms/min, 90 ms/min, 110 ms/min, 115 ms/min, 118 ms/min, 119 ms/min, 119.9 ms/min etc., more preferably 30 ~ 100 ms/min, be particularly preferably 50 ~ 80 ms/min.
Preferably, described in step (4), stretch-bending straightening adopts 23 roller drawing and straightening machines.
Preferably, slitting described in step (5) is cut and is adopted hobboing cutter disc type slitter.
Preferably, described in step (5), slitting cuts finished width is 50 ~ 500mm, more preferably 100 ~ 300mm, is particularly preferably 170 ~ 250mm.
Can by examination and test of products packaging warehouse-in after step (5).
An object of the present invention is also to provide a kind of mild steel precision cold-rolled very thin steel band, the very thin steel band of described mild steel precision cold-rolled is produced by above-mentioned production technology, and its thickness is below 0.08mm, even can reach below 0.06mm, and roughness is Ra0.1 ~ 0.7 μm, unevenness≤0.5mm.
An object of the present invention is also the purposes providing the very thin steel band of described mild steel precision cold-rolled; the very thin steel band of described mild steel precision cold-rolled can be used for the production of the steel article needing coating pigment or protective layer; be particularly preferred for the production of toy industry steel article; can meeting intellectuality, automation, miniaturization and colouring toy, to be less than 0.10mm to material thickness requirement thick; there is certain roughness on surface; firmly do not come off after printing color, and the requirement of the smooth easy-formation of plate shape.
Very thin steel band of the present invention refers to the steel band of thickness at below 0.08mm.
Object of peeling off of the present invention is remove oxide layer and other material on raw material coil of strip surface.
Compared with prior art, remarkable advantage of the present invention is:
(1) production technology is simple, adopts existing equipment and technology, by selecting the synergy of raw material and technological parameter, and the product of preparation high-quality;
(2) product has certain roughness, and surface printing layer or protective layer firmly do not come off;
(3) plate shape glacing flatness is high, easy-formation;
(4) thickness is below 0.08mm, even can reach below 0.06mm.
Accompanying drawing explanation
Fig. 1 is the process chart of one embodiment of the invention.
Detailed description of the invention
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment is only help to understand the present invention, should not be considered as concrete restriction of the present invention.
Embodiment 1
Select the trade mark to be SPHC low-carbon hot-rolled steel stock roll in the present embodiment, its thickness is 3.0mm, width 1245mm.Mild steel cold-rolled strip finished product thickness is 0.06mm ± 0.005, and width is
vickers hardness hv>=170.
(1) first selecting the trade mark to be SPHC low-carbon hot-rolled steel stock roll is raw material, its chemical analysis: carbon (C) 0.04%, silicon (Si) 0.020%, manganese (Mn) 0.18%, phosphorus (P) 0.016%, sulphur (S) 0.010%, its thickness is that 3.0mm is thick, width 455mm wide (1245mm is wide to cut).
(2) the low-carbon hot-rolled steel stock roll being 3.0mm to thickness is peeled off pickling, and Cleaning and Passivation is dried.Adopt three slot type shallow slots to immerse acid cleaning process, its mordant is hydrochloric acid, and point three grooves, increase successively by steel band traffic direction and treat that principle preparation acid strength is 5%, 10%, 18%, pickling temperature is followed successively by 75 DEG C, 77 DEG C, 80 DEG C.Steel band pickling speed 40 ms/min, enters deactivation slot calorized steel belt surface at once, its temperature 70 C after the residual acid solution in cleaning showers surface, enters hot air chamber and dry surface, then align steel band, rolling by squeeze roll after squeezing raffinate.
(3) hot-rolled billet that pickling processes surface has been silvery white in color adopts four roller reversable cold-rolling machines of high stiffness, large roll-force, high stable tension force, tape thickness AGC control system, is rolled to the thick semi-finished product cold-rolled strip of 0.30mm by thick for 3.0mm hot rolled coil by 7 passages.The model selecting Quaker Chemical（China）Co., Ltd. to produce during rolling is that to prepare mass concentration be 2 ~ 6% for C420 special-purpose emulsifying liquid and water, pH value be 8 cooling fluid breaker roll carry out cooling and lubricating.
(4) uncoiling is carried out to the cold rolling rerolled steel roll coil of strip through roughing, the degreaser of the degreasing agent containing 40g/L that the model using Fine Chemical Co., Ltd of superfamily of Foshan City to produce is prepared for F-8300 kaline metal surfaces degreasing powder and water, spray steel strip surface implements surface degreasing process to steel band, it is 75 DEG C that its temperature controls, clean water chamber clean surface is entered after degreasing, then drying surface, rolling, adopting winding tension to be 1kg/mm for avoiding producing steel band bonding during annealing
2.The degreasing unit speed of service is set to 40 ms/min.
(5) adopt the steel band shove charge of strong convection gas shield shield type bright annealing oven to degreasing, loose winding to heat-treat annealing in process, now adopting protective atmosphere to be volume content is 25%N
2and 75%H
2and the ammonolysis craft gas of dew point up to-60 DEG C, guarantee the steel strip surface non-oxidizing bright after annealing, soap-free emulsion polymeization.Annealing temperature is set as 610 DEG C.
(6) utilize high accuracy four roller reversable cold-rolling machine to carry out second time to the steel band that bright annealing recovers plasticity to cold pressing and prolong.Thick for 0.30mm steel band is rolled to 0.06mm thick through multiple passage.The work roll surface hardness HS 95 selected, roll surface roughness controls to Ra0.2 ~ 0.3 μm, with steel strip surface light after ensureing rolling there is the sags and crests of certain depth, namely required roughness value, to ensure the firmness of the colour plane after printing, adopt the just curved pattern of working roll and large convexity roll shape, convex value is 0.005mm, roll-force controls 450 tons, and object is that very thin steel band template is straight without side wave and medium wave.Mill speed is set to 350 ms/min, and the model adopting grand lubricating oil (China) Co., Ltd of state to produce during rolling is the cooling and lubricating that calendering bright dipping PT-T ROLLING OIL carries out roll and steel band.
(7) taking super large flexibility i.e. bending angle value to be that 15mm carries out stretch-bending straightening process to being rolled down to finished product thickness 0.06mm steel band, then adopting 23 roller stretch bending-straightening machines again to carry out the improvement of plate shape to steel band.Now take permanent percentage elongation pattern and percentage elongation is set to 0.5%, speed is 50 ms/min.Through the very thin steel band every meter side wave of above-mentioned technique be no more than 5 and height lower than 0.5mm.
(8) hobboing cutter disc type slitter is adopted to divide the finished product packing being cut into 170 ~ 250mm warehouse-in to the steel band width on request that straightening is up to the standards.
Adopt the product that above-mentioned technology is produced, its main performance index can reach:
Thickness deviation: 0.06 ± 0.005mm
Width difference:
Hardness: HV >=170
Unevenness≤0.5mm
Surface: light and there is the even convex-concave surface that roughness is Ra0.2 ~ 0.3 μm.
Embodiment 2
Select the trade mark to be SPHC low-carbon hot-rolled steel stock roll in the present embodiment, its thickness is 2.75mm, width 1245mm.Mild steel cold-rolled strip finished product thickness is 0.06 ± 0.005mm, and width is
vickers hardness hv>=170.
(1) first selecting the trade mark to be SPHC low-carbon hot-rolled steel stock roll is raw material, its chemical analysis: carbon (C) 0.04%, silicon (Si) 0.020%, manganese (Mn) 0.18%, phosphorus (P) 0.016%, sulphur (S) 0.010%, its thickness is that 2.75mm is thick, width 455mm wide (1245mm is wide to cut).
(2) the low-carbon hot-rolled steel stock roll being 2.75mm to thickness is peeled off pickling, and Cleaning and Passivation is dried.Adopt three slot type shallow slots to immerse acid cleaning process, its mordant is hydrochloric acid, point three grooves, and increase successively by steel band traffic direction and treat that principle preparation acid strength is 12%, 15%, 18%, pickling temperature is followed successively by 75 DEG C, 78 DEG C, 80 DEG C.Steel band pickling speed 40 ms/min, enters deactivation slot calorized steel belt surface at once, its temperature 60 C after the residual acid solution in cleaning showers surface, enters hot air chamber and dry surface, then align steel band, rolling by squeeze roll after squeezing raffinate.
(3) hot-rolled billet that pickling processes surface has been silvery white in color adopts high stiffness, large roll-force, high stable tension force, possesses four roller reversable cold-rolling machines of thickness AGC control system, is rolled to the thick semi-finished product cold-rolled strip of 0.28mm by thick for 2.75mm hot rolled coil by 6 passages.The model selecting Quaker Chemical（China）Co., Ltd. to produce during rolling is C420 special-purpose emulsifying liquid and water compound concentration is 3%, and the cooling fluid breaker roll of pH value 6 carries out cooling and lubricating.
(4) uncoiling is carried out to the cold rolling rerolled steel roll coil of strip through roughing, the model adopting Fine Chemical Co., Ltd of superfamily of Foshan City to produce is the degreaser of the degreasing agent containing 40g/L that F-8300 kaline metal surfaces degreasing powder and water are prepared, spray steel strip surface, surface degreasing process is implemented to steel band, it is 60 DEG C that its temperature controls, and enters clean water chamber clean surface, then dry surface after degreasing, rolling, adopts winding tension to be 20kg/mm for avoiding producing steel band bonding during annealing
2.The degreasing unit speed of service is set to 40 ms/min.
(5) adopt the steel band shove charge of strong convection gas shield shield type bright annealing oven to degreasing, loose winding to heat-treat annealing in process, now adopting protective atmosphere to be volume content is 25%N
2and 75%H
2and dew point is the ammonolysis craft gas of 60 DEG C, guarantee the steel strip surface non-oxidizing bright after annealing, soap-free emulsion polymeization.Annealing temperature is set as 610 DEG C.
(6) utilize high accuracy four roller reversable cold-rolling machine to carry out second time to the steel band that bright annealing recovers plasticity to cold pressing and prolong.Thick for 0.28mm steel band is rolled to 0.06mm thick through multiple passage.The work roll surface hardness HS 95 selected, roll surface roughness controls to Ra0.2 ~ 0.3 μm, and have a sags and crests of certain depth with steel strip surface light after ensureing rolling, namely required roughness value, to ensure the firmness of the colour plane after printing.Adopt the just curved pattern of working roll and large convexity roll shape, convex value is 0.10mm, and roll-force is 300 tons, and object is the straight calm and medium wave of very thin steel band template.Mill speed is set to 350 ms/min, and the model adopting grand lubricating oil (China) Co., Ltd of state to produce during rolling is the cooling and lubricating that PT-T ROLLING OIL carries out roll and steel band.
(7) taking super large flexibility i.e. bending angle value to be that 50mm carries out stretch-bending straightening process to being rolled down to finished product thickness 0.06mm steel band, then adopting 23 roller stretch bending-straightening machines again to carry out the improvement of plate shape to steel band.Now take permanent percentage elongation pattern and percentage elongation is set to 0.3%, speed is 80 ms/min.Through the very thin steel band every meter side wave of above-mentioned technique be no more than 5 and height lower than 0.5mm.
(8) adopt hobboing cutter disc type slitter to divide to the steel band width on request that straightening is up to the standards and be cut into the wide finished product packing warehouse-in of 170 ~ 250mm.
Adopt the product that above-mentioned technology is produced, its main performance index can reach:
Thickness deviation: 0.06 ± 0.005mm
Width difference:
Hardness: HV >=170
Unevenness≤0.5mm
Surface: light and there is the even convex-concave surface that roughness is Ra0.2 ~ 0.3 μm.
Embodiment 3
Select the trade mark to be SPHC low-carbon hot-rolled steel stock roll in the present embodiment, its thickness is 1.0mm, width 1245mm.Mild steel cold-rolled strip finished product thickness is 0.03 ± 0.005mm, and width is
vickers hardness hv>=170.
(1) first selecting the trade mark to be SPHC low-carbon hot-rolled steel stock roll is raw material, its chemical analysis: carbon (C) 0.04%, silicon (Si) 0.020%, manganese (Mn) 0.18%, phosphorus (P) 0.016%, sulphur (S) 0.010%, its thickness is that 1.0mm is thick, width 455mm wide (1245mm is wide to cut).
(2) the low-carbon hot-rolled steel stock roll being 1.0mm to thickness is peeled off pickling, and Cleaning and Passivation is dried.Adopt two slot type shallow slots to immerse acid cleaning process, its mordant is hydrochloric acid, point two grooves, and increase successively by steel band traffic direction and treat that principle preparation acid strength is 15%, 20%, pickling temperature is followed successively by 40 DEG C, 60 DEG C.Steel band pickling speed 80 ms/min, enters deactivation slot calorized steel belt surface at once, its temperature 30 DEG C after the residual acid solution in cleaning showers surface, enters hot air chamber and dry surface, then align steel band, rolling by squeeze roll after squeezing raffinate.
(3) hot-rolled billet that pickling processes surface has been silvery white in color adopts high stiffness, large roll-force, high stable tension force, possesses four roller reversable cold-rolling machines of thickness AGC control system, is rolled to the thick semi-finished product cold-rolled strip of 0.20mm by thick for 1.0mm hot rolled coil by 4 passages.The model selecting Quaker Chemical（China）Co., Ltd. to produce during rolling is C420 special-purpose emulsifying liquid and water compound concentration is 1%, and the cooling fluid breaker roll of pH value 5 carries out cooling and lubricating.
(4) uncoiling is carried out to the cold rolling rerolled steel roll coil of strip through roughing, the model adopting Fine Chemical Co., Ltd of superfamily of Foshan City to produce is the degreaser of the degreasing agent containing 20g/L that F-8300 kaline metal surfaces degreasing powder and water are prepared, spray steel strip surface, surface degreasing process is implemented to steel band, it is 100 DEG C that its temperature controls, and enters clean water chamber clean surface, then dry surface after degreasing, rolling, adopts winding tension to be 2kg/mm for avoiding producing steel band bonding during annealing
2.The degreasing unit speed of service is set to 80 ms/min.
(5) adopt the steel band shove charge of strong convection gas shield shield type bright annealing oven to degreasing, loose winding to heat-treat annealing in process, now adopt protective atmosphere to be N
2, guarantee the steel strip surface non-oxidizing bright after annealing, soap-free emulsion polymeization.Annealing temperature is set as 500 DEG C.
(6) utilize high accuracy four roller reversable cold-rolling machine to carry out second time to the steel band that bright annealing recovers plasticity to cold pressing and prolong.Thick for 0.20mm steel band is rolled to 0.03mm thick through multiple passage.The work roll surface hardness HS 80 selected, roll surface roughness controls to Ra0.6 ~ 0.7 μm, and have a sags and crests of certain depth with steel strip surface light after ensureing rolling, namely required roughness value, to ensure the firmness of the colour plane after printing.Adopt the just curved pattern of working roll and large convexity roll shape, convex value is 0.01mm, and roll-force is 200 tons, and object is the straight calm and medium wave of very thin steel band template.Mill speed is set to 200 ms/min, and the model adopting grand lubricating oil (China) Co., Ltd of state to produce during rolling is the cooling and lubricating that PT-T ROLLING OIL carries out roll and steel band.
(7) taking super large flexibility i.e. bending angle value to be that 5mm carries out stretch-bending straightening process to being rolled down to finished product thickness 0.03mm steel band, then adopting 23 roller stretch bending-straightening machines again to carry out the improvement of plate shape to steel band.Now take permanent percentage elongation pattern and percentage elongation is set to 0.1%, speed is 20 ms/min.Through the very thin steel band every meter side wave of above-mentioned technique be no more than 5 and height lower than 0.5mm.
(8) adopt hobboing cutter disc type slitter to divide to the steel band width on request that straightening is up to the standards and be cut into the wide finished product packing warehouse-in of 170 ~ 250mm.
Adopt the product that above-mentioned technology is produced, its main performance index can reach:
Thickness deviation: 0.03 ± 0.005mm
Width difference:
Hardness: HV >=170
Unevenness≤0.5mm
Surface: light and there is the even convex-concave surface that roughness is Ra0.6 ~ 0.7 μm.
Embodiment 4
Select the trade mark to be SPHC low-carbon hot-rolled steel stock roll in the present embodiment, its thickness is 4.5mm, width 1245mm.Mild steel cold-rolled strip finished product thickness is 0.08 ± 0.005mm, and width is
vickers hardness hv>=170.
(1) first selecting the trade mark to be SPHC low-carbon hot-rolled steel stock roll is raw material, its chemical analysis: carbon (C) 0.04%, silicon (Si) 0.020%, manganese (Mn) 0.18%, phosphorus (P) 0.016%, sulphur (S) 0.010%, its thickness is that 4.5mm is thick, width 455mm wide (1245mm is wide to cut).
(2) the low-carbon hot-rolled steel stock roll being 4.5mm to thickness is peeled off pickling, and Cleaning and Passivation is dried.Adopt four-groove type shallow slot to immerse acid cleaning process, its mordant is hydrochloric acid, point four grooves, and increase successively by steel band traffic direction and treat that principle preparation acid strength is 1%, 4%, 10%, 16%, pickling temperature is followed successively by 50 DEG C, 60 DEG C, 80 DEG C, 100 DEG C.Steel band pickling speed 10 ms/min, enters deactivation slot calorized steel belt surface at once, its temperature 90 DEG C after the residual acid solution in cleaning showers surface, enters hot air chamber and dry surface, then align steel band, rolling by squeeze roll after squeezing raffinate.
(3) hot-rolled billet that pickling processes surface has been silvery white in color adopts high stiffness, large roll-force, high stable tension force, possesses four roller reversable cold-rolling machines of thickness AGC control system, is rolled to the thick semi-finished product cold-rolled strip of 0.40mm by thick for 4.5mm hot rolled coil by 3 passages.The model selecting Quaker Chemical（China）Co., Ltd. to produce during rolling is C420 special-purpose emulsifying liquid and water compound concentration is 15%, and the cooling fluid breaker roll of pH value 9 carries out cooling and lubricating.
(4) uncoiling is carried out to the cold rolling rerolled steel roll coil of strip through roughing, the model adopting Fine Chemical Co., Ltd of superfamily of Foshan City to produce is the degreaser of the degreasing agent containing 60g/L that F-8300 kaline metal surfaces degreasing powder and water are prepared, spray steel strip surface, surface degreasing process is implemented to steel band, it is 30 DEG C that its temperature controls, and enters clean water chamber clean surface, then dry surface after degreasing, rolling, takes to adopt winding tension to be 15kg/mm for avoiding producing steel band bonding during annealing
2.The degreasing unit speed of service is set to 20 ms/min.
(5) adopt the steel band shove charge of strong convection gas shield shield type bright annealing oven to degreasing, loose winding to heat-treat annealing in process, now adopt protective atmosphere to be helium, guarantee the steel strip surface non-oxidizing bright after annealing, soap-free emulsion polymeization.Annealing temperature is set as 700 DEG C.
(6) utilize high accuracy four roller reversable cold-rolling machine to carry out second time to the steel band that bright annealing recovers plasticity to cold pressing and prolong.Thick for 0.40mm steel band is rolled to 0.08mm thick through multiple passage.The work roll surface hardness HS 88 selected, roll surface roughness controls to Ra0.1 ~ 0.2 μm, and have a sags and crests of certain depth with steel strip surface light after ensureing rolling, namely required roughness value, to ensure the firmness of the colour plane after printing.Adopt the just curved pattern of working roll and large convexity roll shape, convex value is 0.08mm, and roll-force is 900 tons, and object is the straight calm and medium wave of very thin steel band template.Mill speed is set to 450 ms/min, and the model adopting grand lubricating oil (China) Co., Ltd of state to produce during rolling is the cooling and lubricating that PT-T ROLLING OIL carries out roll and steel band.
(7) taking super large flexibility i.e. bending angle value to be that 80mm carries out stretch-bending straightening process to being rolled down to finished product thickness 0.08mm steel band, then adopting 23 roller stretch bending-straightening machines again to carry out the improvement of plate shape to steel band.Now take permanent percentage elongation pattern and percentage elongation is set to 1%, speed is 120 ms/min.Through the very thin steel band every meter side wave of above-mentioned technique be no more than 5 and height lower than 0.5mm.
(8) adopt hobboing cutter disc type slitter to divide to the steel band width on request that straightening is up to the standards and be cut into the wide finished product packing warehouse-in of 170 ~ 250mm.
Adopt the product that above-mentioned technology is produced, its main performance index can reach:
Thickness deviation: 0.08 ± 0.005mm
Width difference:
Hardness: HV >=170
Unevenness≤0.5mm
Surface: light and there is the even convex-concave surface that roughness is Ra0.1 ~ 0.2 μm.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of auxiliary element, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (71)
1. a production technology for the very thin steel band of mild steel precision cold-rolled, comprises the following steps:
(1) pretreatment;
(2) heat treatment: the steel band that step (1) obtains is carried out annealing in process at 500 ~ 700 DEG C;
(3) finish rolling system: adopt roughness to be the working roll of Ra0.1 ~ 0.7 μm, the steel band essence that step (2) obtains is rolling to below 0.08mm thickness, and roll-force is 200 ~ 900 tons;
(4) stretch-bending straightening: steel band step (3) obtained adopts the straight technique of the permanent extension of straightening combination to carry out stretch-bending straightening process;
(5) slitting is cut: the steel band sub-cut that step (4) obtains is finished product by width as requested;
Wherein, heat treatment described in step (2) adopts the shield type bright annealing oven of strong convection protective gas, and described protective gas is volume content is 25%N
2and 75%H
2and the ammonolysis craft gas of dew point up to-60 DEG C; Described in step (3), finish rolling system adopts more than 2 passages, finish rolling system described in step (3) adopts the rolling of working roll positive curve, convex value is 0.005 ~ 0.10mm, and the ROLLING OIL that finish rolling system described in step (3) adopts is PT-T ROLLING OIL that grand lubricating oil (China) Co., Ltd of state produces.
2. the production technology of the very thin steel band of mild steel precision cold-rolled as claimed in claim 1, it is characterized in that, described in step (1), pretreatment comprises:
(1 ') peels off, pickling: with thickness be the mild steel hot rolled coil of 1.0 ~ 4.5mm for raw material, carry out uncoiling, mechanical descaling, pickling, passivation, drying, rolling successively by after its sub-cut;
(2 ') roughing system: steel band rolling step (1 ') obtained is 0.20 ~ 0.40mm;
(3 ') loose winding, degreasing, dry: steel band step (2 ') obtained carries out uncoiling, then degreased surface, final drying, rolling.
3. the production technology of the very thin steel band of mild steel precision cold-rolled as claimed in claim 2, it is characterized in that, the thickness of the hot rolled coil of raw material mild steel described in step (1 ') is 2.0 ~ 3.5mm.
4. the production technology of the very thin steel band of mild steel precision cold-rolled as claimed in claim 3, it is characterized in that, the thickness of the hot rolled coil of raw material mild steel described in step (1 ') is 2.75 ~ 3.0mm.
5. the production technology of the very thin steel band of mild steel precision cold-rolled as claimed in claim 2, is characterized in that, before the post-passivation of pickling described in step (1 '), clean steel band.
6. the production technology of the very thin steel band of mild steel precision cold-rolled as claimed in claim 5, is characterized in that, described cleaning sprays for adopting water; Described cleaning temperature is 5 ~ 90 DEG C.
7. the production technology of the very thin steel band of mild steel precision cold-rolled as claimed in claim 6, it is characterized in that, described cleaning temperature is 20 ~ 70 DEG C.
8. the production technology of the very thin steel band of mild steel precision cold-rolled as claimed in claim 7, it is characterized in that, described cleaning temperature is 30 ~ 60 DEG C.
9. the production technology of the very thin steel band of mild steel precision cold-rolled as claimed in claim 2, it is characterized in that, pickling described in step (1 ') is through more than 2 groove pickling.
10. the production technology of the very thin steel band of mild steel precision cold-rolled as claimed in claim 9, it is characterized in that, pickling described in step (1 ') is 3 groove pickling.
The production technology of the very thin steel band of 11. mild steel precision cold-rolled as claimed in claim 2, is characterized in that, the pickle that described pickling adopts comprises strong acid.
The production technology of the very thin steel band of 12. mild steel precision cold-rolled as claimed in claim 11, it is characterized in that, described pickle is hydrochloric acid.
The production technology of the very thin steel band of 13. mild steel precision cold-rolled as claimed in claim 2, it is characterized in that, described in step (1 ') during pickling, each groove pickle concentration presses steel band traffic direction order to be increased, and is 1 ~ 20% by the acid solution liquid mass percentage concentration of steel band traffic direction first groove.
The production technology of the very thin steel band of 14. mild steel precision cold-rolled as claimed in claim 13, is characterized in that, is 3 ~ 15% by the acid solution liquid mass percentage concentration of steel band traffic direction first groove.
The production technology of the very thin steel band of 15. mild steel precision cold-rolled as claimed in claim 14, is characterized in that, is 5 ~ 10% by the acid solution liquid mass percentage concentration of steel band traffic direction first groove.
The production technology of the very thin steel band of 16. mild steel precision cold-rolled as claimed in claim 2, it is characterized in that, pickling temperature is 40 ~ 100 DEG C.
The production technology of the very thin steel band of 17. mild steel precision cold-rolled as claimed in claim 16, it is characterized in that, pickling temperature is 60 ~ 90 DEG C.
The production technology of the very thin steel band of 18. mild steel precision cold-rolled as claimed in claim 17, it is characterized in that, pickling temperature is 75 ~ 80 DEG C.
The production technology of the very thin steel band of 19. mild steel precision cold-rolled as claimed in claim 2, is characterized in that, the speed of pickling described in step (1 ') is 10 ~ 80 ms/min.
The production technology of the very thin steel band of 20. mild steel precision cold-rolled as claimed in claim 19, is characterized in that, the speed of pickling described in step (1 ') is 30 ~ 50 ms/min.
The production technology of the very thin steel band of 21. mild steel precision cold-rolled as claimed in claim 20, is characterized in that, the speed of pickling described in step (1 ') is 40 ms/min.
The production technology of the very thin steel band of 22. mild steel precision cold-rolled as claimed in claim 2, is characterized in that, pickling described in step (1 ') is the pickling of shallow slot immersion.
The production technology of the very thin steel band of 23. mild steel precision cold-rolled as claimed in claim 2, it is characterized in that, the passivating solution that described in step (1 '), passivation is used is nitrite solution.
The production technology of the very thin steel band of 24. mild steel precision cold-rolled as claimed in claim 23, it is characterized in that, the passivating solution that described in step (1 '), passivation is used is sodium nitrite solution.
The production technology of the very thin steel band of 25. mild steel precision cold-rolled as claimed in claim 24, is characterized in that, the passivating solution that described in step (1 '), passivation is used to be mass concentration be 10% sodium nitrite solution.
The production technology of 26. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-3, it is characterized in that, described in step (1 '), passivation temperature is 30 ~ 90 DEG C.
The production technology of the very thin steel band of 27. mild steel precision cold-rolled as claimed in claim 26, it is characterized in that, passivation temperature described in step (1 ') is 50 ~ 80 DEG C.
The production technology of the very thin steel band of 28. mild steel precision cold-rolled as claimed in claim 27, it is characterized in that, passivation temperature described in step (1 ') is 60 ~ 70 DEG C.
The production technology of 29. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-3, is characterized in that, adopts squeeze roll to squeeze out raffinate before dry after passivation in step (1 ').
The production technology of 30. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-3, is characterized in that, dry for drying described in step (1 ').
The production technology of 31. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-3, is characterized in that, after dry described in step (1 ') before rolling, corrects through arbor press.
The production technology of 32. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-4, it is characterized in that, step (2 ') thickness of strips after roughing system is 0.25 ~ 0.35mm.
The production technology of the very thin steel band of 33. mild steel precision cold-rolled as claimed in claim 32, is characterized in that, step (2 ') thickness of strips after roughing system is 0.28 ~ 0.30mm.
The production technology of 34. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-4, it is characterized in that, described in step (2 '), roughing system adopts more than 2 passages.
The production technology of 35. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-4, it is characterized in that, roughing system described in step (2 ') adopts four roller reversable cold-rolling machines.
The production technology of 36. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-4, is characterized in that, the four roller reversable cold-rolling machines that roughing system described in step (2 ') adopts tape thickness AGC to control.
The production technology of 37. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-4, is characterized in that, roughing system described in step (2 ') adopts ROLLING OIL pH to be 5 ~ 9.
The production technology of the very thin steel band of 38. mild steel precision cold-rolled as claimed in claim 37, is characterized in that roughing system described in step (2 ') adopts ROLLING OIL pH to be 6 ~ 8.
The production technology of 39. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-4, it is characterized in that, the employing of roughing system described in step (2 ') mass percent is that the C420 aqueous solution of Quaker Chemical（China）Co., Ltd.'s production of 1 ~ 15% lubricates.
The production technology of 40. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-4, it is characterized in that, the employing of roughing system described in step (2 ') mass percent is the C420 aqueous solution of Quaker Chemical（China）Co., Ltd.'s production of 2 ~ 6%.
The production technology of 41. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-5, is characterized in that, degreasing described in step (3 ') adopts alkaline degreasing liquid.
The production technology of the very thin steel band of 42. mild steel precision cold-rolled as claimed in claim 41, is characterized in that, the F-8300 aqueous solution that degreasing described in step (3 ') adopts Fine Chemical Co., Ltd of superfamily of Foshan City to produce.
The production technology of the very thin steel band of 43. mild steel precision cold-rolled as claimed in claim 42, is characterized in that, the employing of degreasing described in step (3 ') concentration is the F-8300 aqueous solution of 20 ~ 60g/L.
The production technology of 44. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-5, it is characterized in that, described in step (3 '), skimming temp is 30 ~ 100 DEG C.
The production technology of the very thin steel band of 45. mild steel precision cold-rolled as claimed in claim 44, it is characterized in that, skimming temp described in step (3 ') is 50 ~ 80 DEG C.
The production technology of the very thin steel band of 46. mild steel precision cold-rolled as claimed in claim 45, it is characterized in that, skimming temp described in step (3 ') is 60 ~ 75 DEG C.
The production technology of 47. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-5, it is characterized in that, degreasing speed described in step (3 ') is less than 80 ms/min.
The production technology of the very thin steel band of 48. mild steel precision cold-rolled as claimed in claim 47, it is characterized in that, degreasing speed described in step (3 ') is 20 ~ 60 ms/min.
The production technology of the very thin steel band of 49. mild steel precision cold-rolled as claimed in claim 48, it is characterized in that, degreasing speed described in step (3 ') is 30 ~ 50 ms/min.
The production technology of 50. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-5, is characterized in that, clean after degreasing described in step (3 ') before drying, and described cleaning sprays for adopting water.
The production technology of 51. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-5, is characterized in that, dry for drying described in step (3 ').
The production technology of 52. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 2-5, is characterized in that, rolling described in step (3 ') adopts winding tension to be 1 ~ 20kg/mm
2.
The production technology of 53. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-6, it is characterized in that, described in step (2), heat treatment temperature is 550 ~ 650 DEG C.
The production technology of the very thin steel band of 54. mild steel precision cold-rolled as claimed in claim 53, it is characterized in that, described in step (2), heat treatment temperature is 590 ~ 610 DEG C.
The production technology of 55. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-6, it is characterized in that, described in step (3), finish rolling system adopts four roller reversable cold-rolling machines.
The production technology of 56. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-6, is characterized in that, in step (3), institute's employing working roll roll surface roughness is Ra0.12 ~ 0.4 μm.
The production technology of 57. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-6, is characterized in that, in step (3), institute's employing working roll hardness is HS88 ~ 98.
The production technology of the very thin steel band of 58. mild steel precision cold-rolled as claimed in claim 57, is characterized in that, in step (3), institute's employing working roll hardness is HS90 ~ 95.
The production technology of 59. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-7, it is characterized in that, after finish rolling system described in step (3), thickness of strips is 0.03 ~ 0.07mm.
The production technology of the very thin steel band of 60. mild steel precision cold-rolled as claimed in claim 59, it is characterized in that, after finish rolling system described in step (3), thickness of strips is 0.06mm.
The production technology of 61. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-7, it is characterized in that, described in step (3), roll-force is 250 ~ 700 tons.
The production technology of the very thin steel band of 62. mild steel precision cold-rolled as claimed in claim 61, it is characterized in that, described in step (3), roll-force is 300 ~ 600 tons.
The production technology of 63. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-7, it is characterized in that, described in step (3), smart mill speed is 300 ~ 350 ms/min.
The production technology of 64. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-7, it is characterized in that, described in step (4), stretch-bending straightening flexibility is 5 ~ 80mm.
The production technology of 65. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-7, it is characterized in that, described in step (4), stretch-bending straightening percentage elongation is 0.1 ~ 1%.
The production technology of 66. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-7, it is characterized in that, described in step (4), stretch-bending straightening speed is less than 120 ms/min.
The production technology of 67. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-7, it is characterized in that, described in step (4), stretch-bending straightening adopts 23 roller drawing and straightening machines.
The production technology of 68. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-7, is characterized in that, slitting described in step (5) is cut and adopted hobboing cutter disc type slitter.
The production technology of 69. very thin steel bands of mild steel precision cold-rolled as described in any one of claim 1-7, it is characterized in that, it is 50 ~ 500mm that slitting described in step (5) cuts finished width.
70. 1 kinds of very thin steel bands of mild steel precision cold-rolled, is characterized in that, the very thin steel band of described mild steel precision cold-rolled is produced by the production technology of the very thin steel band of mild steel precision cold-rolled described in any one of claim 1-69.
The purposes of 71. very thin steel bands of mild steel precision cold-rolled as described in claim 70, it is characterized in that, the very thin steel band of described mild steel precision cold-rolled is for needing the production of the steel article of coating pigment or protective layer.
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| CN103418612B (en) * | 2013-08-27 | 2015-05-06 | 大连职业技术学院 | Six-roller reversible cold-rolling production technology of common carbon steel sheet |
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| CN115121609B (en) * | 2022-06-29 | 2023-04-28 | 山东新美达科技材料有限公司 | Manufacturing method and equipment for 0.06mm cold rolled steel foil |
| CN115569986B (en) * | 2022-09-26 | 2023-05-05 | 山东新美达科技材料有限公司 | Rolling method for rolling 0.115 x 750mm narrow-band cold-rolled low-carbon steel coil by wide rolling mill |
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