CN106111699A - A kind of processing method of edge crack when suppressing fragile material to roll - Google Patents
A kind of processing method of edge crack when suppressing fragile material to roll Download PDFInfo
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- CN106111699A CN106111699A CN201610487428.2A CN201610487428A CN106111699A CN 106111699 A CN106111699 A CN 106111699A CN 201610487428 A CN201610487428 A CN 201610487428A CN 106111699 A CN106111699 A CN 106111699A
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- edge
- rolling
- latten
- fragile material
- plastic material
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- 239000000463 material Substances 0.000 title claims abstract description 107
- 238000003672 processing method Methods 0.000 title description 3
- 238000005096 rolling process Methods 0.000 claims abstract description 60
- 229910000806 Latten Inorganic materials 0.000 claims abstract description 41
- 238000003466 welding Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000005336 cracking Methods 0.000 claims abstract description 13
- 238000005097 cold rolling Methods 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 238000005516 engineering process Methods 0.000 claims abstract description 8
- 238000003801 milling Methods 0.000 claims abstract description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 238000005554 pickling Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000005728 strengthening Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 5
- 229910000976 Electrical steel Inorganic materials 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 15
- 229910052710 silicon Inorganic materials 0.000 description 12
- 230000006698 induction Effects 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 229910000640 Fe alloy Inorganic materials 0.000 description 3
- 239000010425 asbestos Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 229910052895 riebeckite Inorganic materials 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- 229910017372 Fe3Al Inorganic materials 0.000 description 2
- 229910001005 Ni3Al Inorganic materials 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 230000003064 anti-oxidating effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910021330 Ti3Al Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Metal Rolling (AREA)
Abstract
A kind of method that the invention provides edge crack behavior suppressing fragile material in the operation of rolling, it is characterized in that technological process is: both sides and the material with some strength and plasticity to fragile material latten are connected, to strengthen the plastic working ability of edge, first with milling train, composite plate is carried out warm-rolling, then cold rolling at room temperature is carried out, final acquisition surface quality is good, without edge cracking phenomena latten.The present invention utilizes the technology of edge welding plastic material, the edge that fragile material is easily generated cracking is strengthened, overcome fragile material difficult cold rolling time edge crack problem, obtain perfect sunken and that surface quality is good fragile material latten, the technology of the plastic material of edge welding simultaneously improves the lumber recovery that fragile material latten produces, and also considerably reduces the probability that the broken belt casualty accident caused during continuous prodution occurs due to edge crack problem.
Description
Technical field
The present invention relates to technical field of metal material preparation, edge when fragile material can be suppressed to roll particularly to one
The processing method of cracking.
Technical background
Only produce the least deformation under external force i.e. to destroy the material of fracture be referred to as fragility (such as stretching, impact etc.)
Material.Ti is included at the typical fragile material of metal material field3Al base alloy, TiAl-base alloy, Ti2AlNb base alloy,
Ni3Al base alloy, Fe3Al base alloy and Fe-6.5wt.%Si height silicon steel.
Ti3Al base alloy, TiAl-base alloy and Ti2AlNb base alloy has low-density (3.8～5.8g/cm3), high temperature
The advantages such as high intensity, high stiffness and the antioxidation of excellence, creep resistant, can make structural member loss of weight 35～50%.Ni3Al base closes
Gold, MX-246 has the most corrosion-resistant, wear-resistant and cavitation performance, shows fabulous application prospect.Fe3Al base alloy
There is good antioxidation and wear-corrosion resistance, have higher-strength, low cost in middle temperature (less than 600 DEG C), be that one can portion
Divide and replace stainless new material.Fe-6.5wt.%Si height silicon steel has the most excellent soft magnet performance, for improving electrical equipment effect
Rate, the saving energy have very important significance.
There is many difficulties in fragile material in terms of machining, and fragile material is moulded because of itself when rolling always
Property is poor, and to cause the cracking phenomenon of edge be wherein highlighted.
Steel edge portion cracking (being called for short limit to split) is the problem often met in cold-rolled process.Strip edge splits and directly results in band
The decline of steel quality of edges, reduces the lumber recovery of steel, causes the huge wasting of resources, and serious even causing is disconnected
Band accident；Cold rolling being usually is carried out under the high-speed working condition of the tension force and hundreds of meters per minute that bear tens of tons, and broken belt causes
Enormous impact production equipment can be made badly damaged, thus cause production efficiency to reduce, cause the tremendous economic being difficult to estimate to damage
Lose.
The influence factor of cold rolling edge crack is a lot, and from steel-making to hot rolling again to cold rolling process, coverage is relatively wide, but from
The angle analysis of cold rolling mill, the reason causing damage limit, cold rolling limit to split defect can be divided into two kinds: cold-rolled substrate quality problems and cold rolling
Process control issues and cold-rolled substrate quality problems include that cold-rolled substrate edge fault and cold-rolled substrate edging tissue are uneven etc..
This invention address that by high silicon plate is carried out edge welding plastic material come to fragile material edge row protect
Protect and then suppress the generation of edge crack phenomenon in the fragile material operation of rolling, improve fragile material roll forming lumber recovery,
Advance the process of fragile material continuous prodution.Have not yet to see and utilize edge welding to suppress fragile material edge crack behavior
Report.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that limit in a kind of suppression fragile material operation of rolling
The method of portion's cracking phenomena, by the method for edge welding plastic material, can effectively suppress edge crack phenomenon, improve fragility
Material roll forming lumber recovery, and finally prepare the surface quality flawless latten of good edge.
A kind of method suppressing fragile material edge crack behavior in cold-rolled process, it is characterised in that technological process
For: both sides and the material with some strength and plasticity to fragile material latten are connected, and add strengthening the plasticity of edge
Work ability, carries out warm-rolling first with milling train to composite plate, then carries out cold rolling at room temperature, and final acquisition surface quality is good, nothing
Edge crack phenomenon latten；
Concrete technology step is as follows:
(1) pretreatment: fragile material latten is carried out at a certain temperature smooth, pickling, to latten edge,
After plastic material edge utilizes grinding machine to polish, at the edge Rankine that the thickness that the welding of latten both sides is prefabricated is identical
Material, obtains composite sheet, and processing cutting edge strengthening material is to one fixed width；
Edge plastic material:
Prefabricated edge plastic material is the plastic material thin plate close with fragile material latten thickness.
Edge plastic material to meet three conditions when selecting:
A) there is good plasticity, individually roll under same process, boundless split generation,
B) carbon equivalent is less than 0.62%, good with fragile material weldability, weld seam flawless,
C) after after under same rolling condition, plastic material rolls, percentage elongation rolls with fragile material, the difference of percentage elongation is exhausted
To value less than 80%；
(3) connect: edge plastic material and fragile material use the mode of argon arc welding or laser welding to be attached, for
Suitable welding procedure selected by brittle alloy and edge plastic material；
(4) line cutting: the width of edge plastic material should control at 1-5mm；Line cut welding to be cut striking at and
Receive at arc；
(5) rolling: preheated by roll before rolling, then selects suitable warm-rolling temperature and temperature according to the difference of fragile material
Roll speed and warm-rolling reduction in pass also has room temperature rolling speed, select suitable rolling pass according to desired thickness；Alloy is thin
Plate, through room temperature repeat-rolling, is rolled to desired thickness；
(6) the fragile material flat cold-rolled sheet that the surface quality of cracking phenomena without edge thick for 0.04-0.5mm is good is obtained.
Wherein the thickness of the fragile material latten described in step (1) is 0.5mm-1mm, and smooth temperature is 500-1000
℃。
Plastic material thin plate described in step (2) is less than 40% with fragile material latten thickness difference, plastic material
Web width is 40-70mm；The carbon equivalent of plastic material thin plate is less than 0.62%.
Preheating temperature before rolling described in step (5) and be 30-100 DEG C, warm-rolling temperature is 50-400 DEG C, warm-rolling speed 20-
40m/min, warm-rolling reduction in pass is 20-50%, selects suitable rolling pass according to desired thickness；Room temperature rolling speed is
20-40m/min。
It is an advantage of the current invention that: utilize the technology of edge welding plastic material, fragile material is easily generated the limit of cracking
Portion strengthens, overcome fragile material difficult cold rolling time edge crack problem, obtained perfect fall into and surface quality is good
Good fragile material latten, the technology of the plastic material of edge welding simultaneously improves the one-tenth that fragile material latten produces
Material rate, also considerably reduce that the broken belt casualty accident caused due to edge crack problem during continuous prodution occurs can
Can property.
Accompanying drawing explanation
Fig. 1 show edge welding and prepares thin strip cold process route chart.
Fig. 2 show Fe-6.5wt.%Si height silicon steel and the 304 stainless steel welded composite members of the embodiment of the present invention one preparation
The microstructure of weld seam.
Fig. 3 show Fe-6.5wt.%Si height silicon steel and the 304 stainless steel welded composite members of the embodiment of the present invention one preparation
The scanning electron microscope backscattered electron image of weld seam.
Fig. 4 show the 0.06mm thickness Fe-6.5wt.%Si height silicon steel flat cold-rolled sheet weld seam of the embodiment of the present invention one preparation
The microstructure at place.
Detailed description of the invention
The specific embodiment of the invention is described in detail below in conjunction with concrete accompanying drawing.It should be noted that, in following embodiment
The technical characteristic described or the combination of technical characteristic are not construed as isolating, and they can be mutually combined thus reach
To superior technique effect.In the accompanying drawing of following embodiment, the identical label that each accompanying drawing is occurred represent identical feature or
Person's parts, can be applicable in different embodiment.
Embodiment one
(1) pretreatment: the Fe-6.5wt.%Si height si fe alloy thin plate that 0.5mm is thick is put into the chamber type electric resistance furnace of temperature
In smooth fixture in, chamber type electric resistance furnace temperature 850 DEG C, temperature retention time 5min, then take out, with two blocks of rustless steels do not heated
Plate press against and cools down, and is cooled to room temperature, then latten carries out pickling and removes scale on surface；To latten limit
Portion, plastic material edge utilize grinding machine to polish.
(2) 304 rustless steels selected by plastic material.
(3) connect: use Laser Welding to fetch the connection realized between Fe-6.5wt.%Si height silicon steel and 304 rustless steels；Adopt
With particular manufacturing craft, grinded for described pickling warm-rolling thin plate is docked with plastic material；Laser welding use weld preheating and
Postheating, preheating temperature is 150 DEG C, and postwelding uses asbestos to wrap up weldment；Welding manner uses two-sided welding i.e.
Overturning test specimen after completing side welding and carry out the welding of opposite side, laser instrument bonding power is 180W, and speed of welding is 30mm/s.
(4) cutting of composite plate is welded: the width of plastic material is 1mm；Line cut at the striking of laser welding and
Receive at arc.
(5) rolling: use induction heating apparatus to realize the heating to roll and latten；With sensing heating before rolling
Roll is preheated to 50 DEG C, and induction heating temperature is 150 DEG C, and induction heating power is 17.3KW；Warm-rolling speed 30m/min, temperature
Rolling reduction in pass is 40%, and after twice warm-rolling, latten thickness is at 0.15-0.25mm；Room temperature rolling speed is 30m/
Min, latten, through room temperature repeat-rolling, obtains the high silicon steel that the surface quality of cracking phenomena without edge thick for 0.06mm is good
Flat cold-rolled sheet.
Embodiment two
(1) pretreatment: the Fe-6.5wt.%Si height si fe alloy thin plate that 0.5mm is thick is put into the chamber type electric resistance furnace of temperature
In smooth fixture in, chamber type electric resistance furnace temperature 850 DEG C, temperature retention time 5min, then take out, with two blocks of rustless steels do not heated
Plate press against and cools down, and is cooled to room temperature, then latten carries out pickling and removes scale on surface；To latten limit
Portion, plastic material edge utilize grinding machine to polish.
(2) plastic material selects the Baosteel trade mark to be the non-oriented silicon steel sheet of B50A470.
(3) connect: use Laser Welding to fetch the non-oriented silicon steel sheet realizing Fe-6.5wt.%Si height silicon steel with B50A470
Between connection；Particular manufacturing craft is used to be docked with plastic material by grinded for described pickling warm-rolling thin plate；Laser welding
Using weld preheating and postheating, preheating temperature is 150 DEG C, and postwelding uses asbestos to wrap up weldment；Welding manner
Using two-sided welding to overturn test specimen after i.e. completing side welding and carry out the welding of opposite side, laser instrument bonding power is 180W, weldering
Connecing speed is 30mm/s.
(4) cutting of composite plate is welded: the width of plastic material is 1mm；Line cut at the striking of laser welding and
Receive at arc.
(5) rolling: use induction heating apparatus to realize the heating to roll and latten；With sensing heating before rolling
Roll is preheated to 50 DEG C, and induction heating temperature is 150 DEG C, and induction heating power is 17.3KW；Warm-rolling speed 30m/min, temperature
Rolling reduction in pass is 40%, and after twice warm-rolling, latten thickness is at 0.15-0.25mm；Room temperature rolling speed is 30m/
Min, latten, through room temperature repeat-rolling, obtains the high silicon steel that the surface quality of cracking phenomena without edge thick for 0.06mm is good
Flat cold-rolled sheet.
Embodiment three
(1) pretreatment: the Fe-6.5wt.%Si height si fe alloy thin plate that 0.5mm is thick is put into the chamber type electric resistance furnace of temperature
In smooth fixture in, chamber type electric resistance furnace temperature 850 DEG C, temperature retention time 5min, then take out, with two blocks of rustless steels do not heated
Plate press against and cools down, and is cooled to room temperature, then latten carries out pickling and removes scale on surface；To latten limit
Portion, plastic material edge utilize grinding machine to polish.
(2) plastic material selects the Baosteel trade mark to be the non-oriented silicon steel sheet of B50A800.
(3) connect: use Laser Welding to fetch the non-oriented silicon steel sheet realizing Fe-6.5wt.%Si height silicon steel with B50A800
Connection；Particular manufacturing craft is used to be docked with plastic material by grinded for described pickling warm-rolling thin plate；Laser welding uses
Weld preheating and postheating, preheating temperature is 150 DEG C, and postwelding uses asbestos to wrap up weldment；Welding manner uses
Two-sided welding overturns test specimen after i.e. completing side welding and carries out the welding of opposite side, and laser instrument bonding power is 180W, welding speed
Degree is 30mm/s.
(4) cutting of composite plate is welded: the width of plastic material is 1mm；Line cut at the striking of laser welding and
Receive at arc.
(5) rolling: use induction heating apparatus to realize the heating to roll and latten；With sensing heating before rolling
Roll is preheated to 50 DEG C, and induction heating temperature is 150 DEG C, and induction heating power is 17.3KW；Warm-rolling speed 30m/min, temperature
Rolling reduction in pass is 40%, and after twice warm-rolling, latten thickness is at 0.15-0.25mm；Room temperature rolling speed is 30m/
Min, latten, through room temperature repeat-rolling, obtains the high silicon steel that the surface quality of cracking phenomena without edge thick for 0.06mm is good
Flat cold-rolled sheet.
The invention have the benefit that the technology utilizing edge welding plastic material, fragile material is easily generated edge and opens
The edge split is protected, overcome fragile material difficult cold rolling time edge crack problem, obtained perfect falling into and surface
The second best in quality fragile material latten, it is raw that the technology of the plastic material of edge welding simultaneously improves fragile material latten
The lumber recovery produced, also considerably reduces the broken belt casualty accident caused due to edge crack problem during continuous prodution and sends out
Raw probability.
Although having been presented for several embodiments of the present invention herein, it will be appreciated by those of skill in the art that
Without departing from the spirit of the invention, the embodiments herein can be changed.Above-described embodiment is exemplary, no
Should be using the embodiments herein as the restriction of interest field of the present invention.
Claims (4)
1. the method suppressing fragile material edge crack behavior in cold-rolled process, it is characterised in that technological process is:
Both sides and the material with some strength and plasticity to fragile material latten are connected, to strengthen the plastic working energy of edge
Power, carries out warm-rolling first with milling train to composite plate, then carries out cold rolling at room temperature, and final acquisition surface quality is good, without edge
Cracking phenomena latten；
Concrete technology step is as follows:
(1) pretreatment: carried out by fragile material latten smooth at a certain temperature, pickling, to latten edge, plasticity
After material edge utilizes grinding machine to polish, at the edge strengthening material that the thickness that the welding of latten both sides is prefabricated is identical,
To composite sheet, processing cutting edge strengthening material is to one fixed width；
(2) edge plastic material:
Prefabricated edge plastic material is the plastic material thin plate close with fragile material latten thickness；
Edge plastic material to meet three conditions when selecting:
A) there is good plasticity, individually roll under same process, boundless split generation,
B) carbon equivalent is less than 0.62%, good with fragile material weldability, weld seam flawless,
C) absolute value of the difference of percentage elongation after percentage elongation and fragile material roll after plastic material rolls under same rolling condition
Less than 80%；
(3) connect: edge plastic material and fragile material use the mode of argon arc welding or laser welding to be attached, for fragility
Suitable welding procedure selected by alloy and edge plastic material；
(4) line cutting: the width of edge plastic material should control at 1-5mm；Line cuts at the striking of welding to be cut and receives arc
Place；
(5) rolling: preheated by roll before rolling, then selects suitable warm-rolling temperature and warm-rolling speed according to the difference of fragile material
Rate and warm-rolling reduction in pass also have room temperature rolling speed, select suitable rolling pass according to desired thickness；Latten warp
Room temperature repeat-rolling, is rolled to desired thickness；
(6) the fragile material flat cold-rolled sheet that the surface quality of cracking phenomena without edge thick for 0.04-0.5mm is good is obtained.
A kind of method suppressing fragile material edge crack behavior in cold-rolled process, it is special
Levying and be that the thickness of the fragile material latten described in step (1) is 0.5mm-1mm, smooth temperature is 500-1000 DEG C.
A kind of method suppressing fragile material edge crack behavior in cold-rolled process, it is special
Levying and be that the plastic material thin plate described in step (2) is less than 40% with fragile material latten thickness difference, plastic material is thin
Plate width is 40-70mm；The carbon equivalent of plastic material thin plate is less than 0.62%.
A kind of method suppressing fragile material edge crack behavior in cold-rolled process, it is special
Preheating temperature before levying the rolling being described in step (5) and be 30-100 DEG C, warm-rolling temperature is 50-400 DEG C, warm-rolling speed 20-
40m/min, warm-rolling reduction in pass is 20-50%, selects suitable rolling pass according to desired thickness；Room temperature rolling speed is
20-40m/min。
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| CN201610487428.2A CN106111699B (en) | 2016-06-28 | 2016-06-28 | A kind of processing method for inhibiting edge crack during fragile material rolling |
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| CN201610487428.2A CN106111699B (en) | 2016-06-28 | 2016-06-28 | A kind of processing method for inhibiting edge crack during fragile material rolling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106702287A (en) * | 2016-12-13 | 2017-05-24 | 东北大学 | Method for improving hot-working performance and room-temperature plasticity of high-boron stainless steel |
| CN114453430A (en) * | 2022-01-20 | 2022-05-10 | 安阳钢铁股份有限公司 | Control method for preventing high magnetic induction oriented silicon steel cold rolling strip breakage |
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| JPH09256067A (en) * | 1996-03-19 | 1997-09-30 | Nisshin Steel Co Ltd | Production of steel sheet for heat treatment excellent in peeling resistance of scale |
| CN102071356A (en) * | 2010-12-22 | 2011-05-25 | 山西太钢不锈钢股份有限公司 | Method for preventing edge crack of low-carbon steel during rolling at high temperature |
| CN102240894A (en) * | 2011-06-01 | 2011-11-16 | 河北钢铁集团有限公司 | Composite manufacturing method of ultra-thick steel plate |
| CN103302097A (en) * | 2013-06-29 | 2013-09-18 | 济钢集团有限公司 | Method for rolling carbon steel and low alloy steel large-piece-weight extra thick composite blank |
| CN104985021A (en) * | 2015-07-29 | 2015-10-21 | 中冶南方(武汉)威仕工业炉有限公司 | Edge heating device and method for preventing edge of strip steel from cracking |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256067A (en) * | 1996-03-19 | 1997-09-30 | Nisshin Steel Co Ltd | Production of steel sheet for heat treatment excellent in peeling resistance of scale |
| CN102071356A (en) * | 2010-12-22 | 2011-05-25 | 山西太钢不锈钢股份有限公司 | Method for preventing edge crack of low-carbon steel during rolling at high temperature |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106702287A (en) * | 2016-12-13 | 2017-05-24 | 东北大学 | Method for improving hot-working performance and room-temperature plasticity of high-boron stainless steel |
| CN106702287B (en) * | 2016-12-13 | 2018-05-29 | 东北大学 | A kind of method for improving high boron stainless steel hot processing performance and temperature-room type plasticity |
| CN114453430A (en) * | 2022-01-20 | 2022-05-10 | 安阳钢铁股份有限公司 | Control method for preventing high magnetic induction oriented silicon steel cold rolling strip breakage |
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| CN106111699B (en) | 2018-05-18 |
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