CN105127205B - Large-scale bushing roll for producing strip and preparation method thereof - Google Patents
Large-scale bushing roll for producing strip and preparation method thereof Download PDFInfo
- Publication number
- CN105127205B CN105127205B CN201510546922.7A CN201510546922A CN105127205B CN 105127205 B CN105127205 B CN 105127205B CN 201510546922 A CN201510546922 A CN 201510546922A CN 105127205 B CN105127205 B CN 105127205B
- Authority
- CN
- China
- Prior art keywords
- roll
- strip
- layer
- bushing
- cast
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
- B21B27/032—Rolls for sheets or strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
Large-scale bushing roll for producing strip and preparation method thereof, belongs to technical field of steel rolling.First cast composite roll set, composite roll set is combined into one by outer layer cast abrasion-resistant alloy and internal layer low-alloy steel bushing using static casting methods, the waste and old strip roller hot charging that composite roll is covered with processing is combined into one again, the large-scale bushing roll for producing strip is obtained.The present invention realizes the twice laid of large-scale waste and old strip roll, and with obvious energy-conservation, section material effect, popularization and application achievement of the present invention has good economic and social benefit.
Description
Technical field
The invention discloses a kind of bushing roll and preparation method thereof, more particularly to bushing rolled for producing the large-scale of strip
Roller and preparation method thereof, belongs to technical field of steel rolling.
Background technology
The abrasion of roller surface working lining is that roll is normally consumed in the operation of rolling, is also cause roll to be scrapped most universal
Reason.In the normal operation of rolling, after roll working lining wear extent reaches to a certain degree, roll need to be gone by grinding roller process
It is continuing with after falling surface coarsening and cracking layer, after being repaired through grinding roller for several times, dimension of roller is too small or working lining runs out of, and rolls
Roller is integrally scrapped.It is unilateral general in below 100mm and roll working lining refers generally to roll barrel quench-hardened case thickness, it is generally not enough
Roll oeverall quality 20%.As can be seen here, the roll caused due to the consumption of working lining, which is scrapped, has great material wave
Take.
In order to extend roll campaign, current common method is to carry out built-up welding processing, Chinese invention patent CN in roller surface
104416293 disclose a kind of composite manufacturing by hard surfacing Casting Roller method, and it includes：1) matrix of Casting Roller is manufactured, to matrix
Surface is handled；2) matrix is preheated；3) in matrix periphery successively built-up welding prime coat and transition zone；4) in transition zone table
Surface build-up welding capping layer forms Casting Roller, and the chemical element component weight/mass percentage composition of capping layer is：C0.3~0.8%；Mn1.0~
4.8%；Si0.4~6.0%；Cr4.0~8.0%；Ti0.01~1.0%；V2.0~10%；W2.0~10.0%；Mo1.0~
6.0%；Co2.0~5.0%；Ca0~0.4%；Ba0~0.4%；Rare earth element 0~0.5%；Surplus is that Fe can not with other
The impurity avoided；5) temper of slowly heating and Slow cooling is carried out to Casting Roller, temperature is 560 DEG C~600 DEG C.
Chinese invention patent CN 103009015 also discloses the manufacture method of bimetal composite wear resistant metallurgical roller, including roller core processing
Step, preheating step, built-up welding composite bed step, finishing step and heat treatment step, wherein：Roller core procedure of processing is first with anti-
Tensile strength, yield strength and the excellent steel of shock resistance make roller core blank, then by roller by forging and stamping and modifier treatment
The roughing of core blank is to reserved built-up welding composite bed size；Preheating step is by the suitable weldering temperature of Preheating Core to 380 DEG C ± 5 DEG C.
Built-up welding composite bed step is the built-up welding composite bed flux-cored wire heap that will reserve the roller core surface submerged welding process after preheating
Weldering is filled up；Finishing step is that the bimetal composite wear resistant metallurgical roller blank of heap postwelding is machined into design size；Heat treatment
Step makes its top layer reach possess for the bimetal composite wear resistant metallurgical roller after finishing is quenched and modifier treatment
Antisticking abrasion, the requirement of anti-abrasive wear, red hardness, thermal fatigue resistance and resistance to flaking.Chinese invention patent CN
103785976 also disclose a kind of hot roll built-up welding submerged arc flux-cored wire and preparation method thereof, and its drug core component is with weight percent
Than being calculated as:5%~14%CaF2,0%~5%Na2SiF6,0%~5%BaCO3,0.1%~0.4%C, 2.0%~5.5%
Mn, 14%~28%Cr, 0.8%~6%Ni, 2%~4.8%Si, 0.6%~4.8%V, 0.8%~7.2%W, 2%~
6%Mo, surplus is Fe.The steel band of flux-cored wire uses low-carbon, and carbon content is less than 0.05%；Medicinal powder filling rate be 18%~
28%, granularity is 80~200 mesh.The submerged-arc welding flux-cored wire that the invention is proposed, it is equal with surfacing layer metal alloying elements distribution
Even, carbide is low in disperse shape, uniform hardness, impurity and diffusible hydrogen content, and crack resistance is good, and Thermal fatigue properties are strong, overlay cladding
The characteristics of hardness uniform abrasion resistance is high, service life is long.Chinese invention patent CN 101804530 also discloses a kind of BD rolls
Special flux-cored wire for surfacing repair, is made up of pipe skin and medicine core, and its pipe skin is HO8A steel bands, and its medicine core composition is：Containing 15-
The high carbon ferro-chrome of 25% mass percent, the chromic carbide iron of 2-10% mass percents, the metal of 5-7% mass percents
Manganese, the molybdenum-iron of 6-12% mass percents, the ferrotungsten of 3-10% mass percents, the vanadium iron of 5-10% mass percents,
The ferrotianium of 0.5-6% mass percents, the Yttrium base rare earth of 0.3-5% mass percents, the ferro-niobium of 1-3% mass percents,
The ice crystal of 4-10% mass percents, the iron powder of 10-50% mass percents, fill factor is 30-45%.The invention
The Cr-Mo-W-V alloy systems matched from optimal alloy, and Ti-Nb-Re microalloy crystal grain thinnings are carried out, make heap
Deposited repair layer has high rigidity, high abrasion, high heat-resisting, high tenacity, high cold-and-heat resistent alternation thermal fatigue property, makes the BD of Bead weld repair
Roll has than the BD roll campaigns of common roll flux-cored wire reparation to be increased exponentially.Chinese invention patent CN 101658986
A kind of Cr3 series of rollers surfacing electrode for repairing and overlaying method, its welding rod include core wire and coating, and core wire is H08A steel, institute
The quality % components for stating electrode coating are：Marble 36~42, fluorite 20~26, low-carbon ferromanganese 1.5~4, molybdenum-iron 1~4, high-carbon
Ferrochrome 13~17, soda ash 0~1.5, rare earth alloy 1~4, titanium dioxide 4~8, graphite 0.5~1.5, No. 45 ferrosilicon 3~5, two
Silica 4~7.Deposited metal flawless, cracking resistance is good, and wearability is good, and hardness is high with plasticity, and temper resistance is good.Weldering
Connect method easy, deposited metal is connected firmly with roll, preferably meets the reparation requirement of Cr3 series of support rolls.China
Patent of invention CN 101104180 also discloses a kind of technical scheme that medication core welding wire built-up welding repairs half steel rider.Welding process point
Three layers；First layer transition zone, flux-cored wire composition C ＜ 0.1%, Mn1.4-1.85%, remaining is Fe.Throat thickness 3mm.The
Two layers of strength layer, flux-cored wire composition C0.15-0.25%, Si ＜ 0.8%, Mn0.8-1.2%, Cr12-14%, Ni ＜
1%, Mo ＜ 1%, Nb ＜ 0.3, remaining is Fe.Throat thickness 10mm.Hardness HRC33-43.Third layer wearing layer, flux-cored wire
Composition C0.3-0.4%, Si ＜ 0.8%, Mn1.2-1.5%, Cr13-15%, Ni3.5-4.5%, Mo1.5-2.5%, V
＜ 1%, W ＜ 3%, remaining is Fe.Throat thickness 15mm, hardness HRC40-50.Ensure 300 DEG C or so of interlayer temperature during welding,
In 600 DEG C of holding furnace inside holding certain times after being continuously soldered.1-2 times is improved with this technique welding ferrosteel roll life-span,
Cost is the 1/3 of former cost, and welding can be repeated several times.With fine economic benefit and social benefit.Chinese invention is special
Sharp CN 101003104 also discloses a kind of section roll build-up welding repair process, and its sequence of process steps is followed successively by thick before roll weldering
Car, carrying out flaw detection, preheating, built-up welding transition zone, built-up welding working lining, post weld heat treatment, roll finished product turnery processing, carrying out flaw detection；
Transition zone resurfacing welding material matches somebody with somebody SSF solder flux using SN-YD1031 flux-cored wires, and working lining resurfacing welding material uses SN-YD285 medicine cores
Welding wire matches somebody with somebody HJ107 solder flux, carries out an intermediate heat-treatment when unilateral thick per built-up welding 30mm in weld deposit process, built-up welding completes laggard
Row post weld heat treatment.The BD2 rolls repaired with this method are through flaw detection, the welding such as no slag inclusion, incomplete fusion, lack of penetration, crackle
Defect, hardness can meet roll rolling use requirement in HRC35-42 scopes.The also public affairs of Chinese invention patent CN 104551444
A kind of cold roll high rigidity high cracking resistance submerged arc overlay welding sintered flux and preparation method, sintered flux constituent mass percentage are opened
Than for：5%≤SiO2≤12%, 1%≤ZrO2≤5%, 8%≤Al2O3≤18%, 1%≤MnO2≤5%, 3≤CaF2≤
14,5%≤MgO≤9%, 1%≤SrCO3≤4%, 5%≤Cr3C2≤12%, 2%≤NbC≤5%, 1%≤Nd2O3≤
3%, 2%≤Y≤5%, 2%≤C≤5%, 3%≤Ni≤8%, 6%≤Cr-Fe≤16%, 5%≤Ti-Fe≤8%, 1%
≤ V-Fe≤3%, 1%≤B-Fe≤3%, 1%≤Mn-Fe≤5%, 2%≤Si-Fe≤5%, the quality hundred of above each component
It is 100% to divide than summation.Under the conditions of submerged-arc welding, welding technological properties is excellent, is not preheated before weldering, postwelding is without slow cooling, weld seam
Beautiful appearance, the removability of slag is good, and built-up welding deposited metal hardness is more than 60HRC, and hardness is evenly distributed, without crackle, surfacing layer metal
Crack resistance is excellent, and impact flexibility is more than 12J.Chinese invention patent CN 1152491 also discloses a kind of surfacing welding electrode for roller, adopts
Core wire is made of H08A steel, electrode coating is low hydrogen type slag system, and coating is by high carbon ferro-chrome 8~10%, molybdenum-iron 3~5%, tungsten
0.5~1.5%, high carbon ferromanganese 1~3%, lithium carbonate 0~1%, the grade of carboxymethyl cellulose 1~2% composition (proportioning by weight hundred
Divide ratio).This welding rod is applied to the built-up welding of the roll stells such as 9Cr2,9CrSi, 9CrV, 9Cr2Mo, 9CrW, 9Cr2MoV, it can also be used to
Surfacing hardness HRc >=60 under the built-up welding of other carbon steels and steel alloy, normal temperature, are not preheated, postwelding need not carry out hot place again before weldering
Reason, overlay cladding flawless, it is as-welded under can be used directly.Chinese invention patent CN 103418923 also discloses a kind of worn rolls
Build-up welding repair method, it is characterised in that comprise the following steps that：The wear surface of worn rolls is first subjected to turnery processing,
Then the high tough transition zone of built-up welding on finished surface, then the build-up wear-resistant working lining on transition zone, then rolls to Bead weld repair
Roller is heat-treated, and is finally refined to given size and precision.The invention and conventional manufacturing process and production method
Compare, manufacturing cost is relatively low, manufacturing cycle is shorter, Bead weld repair roll working life is long.
But, using overlaying method repaired roller, the relatively low steel rider of carbon content is suitable only at present, and for production strip
Large-scale roller, be generally all carbon content higher high-carbon steel rider and cast iron roll, using overlaying method reparation, overlay cladding and transition
Easily there is crackle in layer, and repaired roller percent defective is high, in the industrial production can not popularization and application.
The content of the invention
The present invention seeks to using the waste and old large-sized strip roll after use, using bushing method, recover outside roll barrel
Shape size and hardness, it is ensured that large-sized strip roll has excellent using effect.
The object of the invention can be realized by following technical matters measure.
A kind of large-scale bushing roll for being used to produce strip, it is characterised in that the large-scale bushing roll for producing strip
It is that composite roll set is got rid of obtained by the wearing layer of roll surface, surface coarsening layer and cracking layer with the waste and old large-sized strip roll after use
Roll body hot charging be combined into one, composite roll set is to be cast by outer layer cast abrasion-resistant alloy and internal layer low-alloy steel bushing using static
Method is combined into one；
The chemical composition and its mass fraction % of outer layer cast abrasion-resistant alloy be:1.8-2.5C,18-25Cr,1.5-2.0V,
1.0-1.5Mo,1.0-1.5Ni,3.0-3.5Mn,0.03-0.06Ca,0.08-0.12Mg,0.008-0.015Ce,0.08-
0.15Ti,0.12-0.16N,0.03-0.06Zn,0.5-1.0Si,<0.04S,<0.04P, surplus Fe, 10≤Cr/C≤12；
The chemical composition and its mass fraction % of internal layer low-alloy steel bushing be:0.15-0.30C,0.17-0.40Si,1.6-
2.0Mn,0.17-0.28Cr,0.015-0.030Nb,0.018-0.029Zr,0.025-0.040V,0.02-0.04Y,<0.03S,
<0.03P, surplus Fe.
Further composite roll set outer layer cast abrasion-resistant alloy thickness reaches 50-80mm, and internal layer low-alloy steel bushing thickness is 15-
25mm。
Above-mentioned a kind of preparation method for being used to produce the large-scale bushing roll of strip, it is characterised in that comprise the following steps：
(1) low-alloy steel bushing outer surface is subjected to sandblast texturing, its outer surface roughness is reached after 90-140 μm, outside
The volume ratio of surface coating boric acid solution, boric acid solution mesoboric acid and water is 1:(4.5-5.5), the coating thickness of boric acid solution is
0.6-0.9mm；
(2) the low-alloy steel bushing after step (1) outer surface sandblast texturing and coating boric acid solution is used into electrical induction
Device is heated to after 800-900 DEG C loading casting mold, then cast cast abrasion-resistant alloy liquation, low during cast cast abrasion-resistant alloy liquation
The temperature of alloy steel bushing is not less than 450 DEG C, and 1530-1560 DEG C of cast abrasion-resistant alloy liquation pouring temperature, cast abrasion-resistant alloy melts
After liquid is poured into a mould 2-4 hours, unpack and remove casting, obtain composite roll set blank, composite roll set blank is entered into stove heat to 520-550
DEG C, insulation is furnace-cooled to temperature less than 180 DEG C after 8-10 hours, come out of the stove and be air-cooled to room temperature, then to the composite roll set after heat treatment
Blank carries out machining and obtains composite roll set；
(3) composite roll for processing step (2) is inserted in stove heat to 300~450 DEG C, and insulation is come out of the stove after 6-8 hours, with
The roll body hot charging that waste and old large-sized strip roll gets rid of obtained by the wearing layer of roll surface, surface coarsening layer and cracking layer is combined into one
Body, its magnitude of interference is preferably 0.12-0.18mm, and roll of the hot charging after compound is continued into stove heat to 350-380 DEG C, is incubated
Temperature is furnace-cooled to after 12-15 hours less than 120 DEG C, comes out of the stove and is air-cooled to room temperature, be finally refined to given size and precision, you can
Obtain the large-scale bushing roll for producing strip.
After the present invention utilizes waste or old roll machined, the roll body of bushing roll is done, plays carrying, waste and old roll is realized
The recycling of roller.The present invention uses composite roll set, it is ensured that roller set surface has high rigidity and excellent wearability, roller set internal layer tool
There is high intensity and excellent toughness and excellent machining property.Composite roll of the present invention covers the chemistry of outer layer cast abrasion-resistant alloy
Composition and its mass fraction % are:1.8-2.5C,18-25Cr,1.5-2.0V,1.0-1.5Mo,1.0-1.5Ni,3.0-3.5Mn,
0.03-0.06Ca,0.08-0.12Mg,0.008-0.015Ce,0.08-0.15Ti,0.12-0.16N,0.03-0.06Zn,0.5-
1.0Si,<0.04S,<0.04P, surplus Fe, 10≤Cr/C≤12, it can be ensured that MC and M in outer tissue7C3Type carbide hard
Matter phase, is firmly embedded on martensite-bainite matrix, cladding material is had excellent wearability and antifatigue peeling
Power.
The chemical composition and its mass fraction % of composite roll of the present invention set internal layer low-alloy steel bushing be:0.15-0.30C,
0.17-0.40Si,1.6-2.0Mn,0.17-0.28Cr,0.015-0.030Nb,0.018-0.029Zr,0.025-0.040V,
0.02-0.04Y,<0.03S,<0.03P, surplus Fe, it is ensured that internal layer has excellent obdurability and processing characteristics.In addition, in order to
The combination effect of outer abrasion resistant alloy and internal layer low-alloy steel bushing is improved, firm metallurgical binding is achieved, the present invention will be low
Alloy steel bushing outer surface carries out sandblast texturing, its outer surface roughness is reached after 90-140 μm, and in outer surface, coating boric acid is molten
The volume ratio of liquid, boric acid solution mesoboric acid and water is (1:4.5)-(1:5.5), the coating thickness of boric acid solution is 0.6-0.9mm.
In order to further improve bond quality, the present invention also adopts the low-alloy steel bushing after outer surface sandblast texturing and coating boric acid solution
It is heated to after 800-900 DEG C loading casting mold with electric induction heater, then cast cast abrasion-resistant alloy liquation, pours into a mould casting wear-resistant
The temperature of low-alloy steel bushing is not less than 450 DEG C, 1530-1560 DEG C of cast abrasion-resistant alloy liquation pouring temperature during alloy molten solution.
In order to ensure compound roller sleeve abrasion resistant layer occurs without crackle, after cast abrasion-resistant alloy liquation is poured into a mould 2-4 hours, unpack
Casting is removed, composite roll set blank is obtained, composite roll set blank is entered into stove heat to 520-550 DEG C, stove after being incubated 8-10 hours
It is cooled to temperature less than 180 DEG C, comes out of the stove and be air-cooled to room temperature, machining acquisition then is carried out to the composite roll set blank after heat treatment
Composite roll set, makes composite roll cover outer layer cast abrasion-resistant alloy thickness and reaches 50-80mm, internal layer low-alloy steel bushing thickness is 15-
25mm。
The composite roll processed is also inserted in stove heat to 300~450 DEG C by the present invention, and insulation is come out of the stove after 6-8 hours, with giving up
The roll body hot charging that old large-sized strip roll gets rid of obtained by the wearing layer of roll surface, surface coarsening layer and cracking layer is combined into one,
Its magnitude of interference is 0.12-0.18mm.In order to ensure the safe handling of large-scale bushing roll, the present invention rolling after compound also by hot charging
Roller continues into stove heat to 350-380 DEG C, and insulation is furnace-cooled to temperature less than 120 DEG C after 12-15 hours, come out of the stove and be air-cooled to room temperature,
Finally it is refined to given size and precision, you can obtain the large-scale bushing roll for producing strip.
The present invention compared with prior art, with advantages below：
1) the large-sized strip roll scrapped can be used, accomplishes to make the best use of everything, save roll fund；
2) manufacturing cycle of large-sized strip roll is reduced, with obvious energy-saving advantage；
3) bushing roll working lining hardness is high, reaches 82-85HSD, and uniformity of hardness is good, and roll surface difference of hardness is less than
1.8HSD；
4) being used to produce the large-scale bushing roll of strip has excellent using effect, and its service life reaches former roll
120-125%, but production cost only has the 50-55% of former roll, popularization and application achievement of the present invention has good economy and society
Can benefit.
Brief description of the drawings
Fig. 1 is used for waste and old large-sized strip roll schematic diagram after the use of machining
The roll body of the waste and old large-sized strip rolls of 1-, the wearing layers of the waste and old large-sized strip roll surfaces of 4-, surface coarsening layer and
Be cracked layer.
Fig. 2 is used for the large-scale bushing roll schematic diagram for producing strip
The roll body of the waste and old large-sized strip rolls of 1-, 2- cast abrasion-resistant alloy outer layers, 3- internal layer low-alloy steel bushings.
Embodiment
The present invention is further described with reference to embodiments, but the present invention is not limited to following examples.
Embodiment 1：
The present invention is using the waste and old large-sized strip roll after use, using bushing method, recovers large-sized strip roll barrel
Appearance and size and hardness, it is ensured that large-sized strip roll has excellent using effect.
Composite roll set is first cast, composite roll set is cast by outer layer cast abrasion-resistant alloy 2 and internal layer low-alloy steel bushing 3 using static
The method of making is combined into one, then composite roll set and waste and old large-sized strip roll are got rid of into the wearing layer of roll surface, surface coarsening layer
It is combined into one with the hot charging of roll body 1 obtained by cracking layer, obtains the large-scale bushing roll for producing strip；
The chemical composition and its mass fraction % of outer layer cast abrasion-resistant alloy 2 be:1.82C,20.47Cr,1.53V,
1.44Mo,1.49Ni,3.05Mn,0.034Ca,0.116Mg,0.009Ce,0.12Ti,0.121N,0.058Zn,0.64Si,
0.017S, 0.028P, surplus Fe, Cr/C=11.25；
The chemical composition and its mass fraction % of internal layer low-alloy steel bushing 3 be:0.19C,0.36Si,1.88Mn,0.18Cr,
0.019Nb, 0.027Zr, 0.028V, 0.035Y, 0.014S, 0.026P, surplus Fe.
Its particular technique processing step is：
(1) outer surface of low-alloy steel bushing 3 is subjected to sandblast texturing, its outer surface roughness is reached after 90-115 μm,
The volume ratio of outer surface coating boric acid solution, boric acid solution mesoboric acid and water is 1:4.5, the coating thickness of boric acid solution is 0.6-
0.8mm；
(2) the low-alloy steel bushing 3 after outer surface sandblast texturing and coating boric acid solution is added using medium frequency induction heater
Load casting mold after hot to 800-900 DEG C, then cast cast abrasion-resistant alloy liquation, low-alloy during cast cast abrasion-resistant alloy liquation
The temperature of steel bushing 3 is not less than 450 DEG C, and 1532 DEG C of cast abrasion-resistant alloy liquation pouring temperature, cast abrasion-resistant alloy liquation cast 4 is small
Shi Hou, unpacks and removes casting, obtains composite roll set blank, composite roll set blank is entered into stove heat to 520 DEG C, after being incubated 10 hours
Temperature is furnace-cooled to less than 180 DEG C, comes out of the stove and is air-cooled to room temperature, then carrying out machining to the composite roll set blank after heat treatment obtains
Composite roll set is obtained, composite roll is covered the thickness of outer layer cast abrasion-resistant alloy 2 and reaches 52mm, the thickness of internal layer low-alloy steel bushing 3 is 18mm；
(3) composite roll processed is inserted in stove heat to 380 DEG C, insulation is come out of the stove after 7 hours, is rolled with waste and old large-sized strip
The hot charging of roll body 1 that roller gets rid of obtained by the wearing layer of roll surface, surface coarsening layer and cracking layer is combined into one, and its magnitude of interference is
0.12mm, roll of the hot charging after compound was continued into stove heat to 360 DEG C, insulation is furnace-cooled to temperature less than 120 DEG C after 14 hours,
Come out of the stove and be air-cooled to room temperature, be finally refined to given size and precision, you can obtain the large-scale bushing roll for producing strip,
Its mechanical property is shown in Table 1.
Embodiment 2：
The present invention is using the waste and old large-sized strip roll after use, using bushing method, recovers large-sized strip roll barrel
Appearance and size and hardness, it is ensured that large-sized strip roll has excellent using effect.
Composite roll set is first cast, composite roll set is cast by outer layer cast abrasion-resistant alloy 2 and internal layer low-alloy steel bushing 3 using static
The method of making is combined into one, then composite roll set and waste and old large-sized strip roll are got rid of into the wearing layer of roll surface, surface coarsening layer
It is combined into one with the hot charging of roll body 1 obtained by cracking layer, obtains the large-scale bushing roll for producing strip；
The chemical composition and its mass fraction % of outer layer cast abrasion-resistant alloy 2 be:2.44C,24.68Cr,1.99V,
1.02Mo,1.36Ni,3.48Mn,0.059Ca,0.087Mg,0.014Ce,0.09Ti,0.148N,0.033Zn,0.92Si,
0.021S, 0.030P, surplus Fe, Cr/C=10.11；
The chemical composition and its mass fraction % of internal layer low-alloy steel bushing 3 be:0.29C,0.18Si,1.61Mn,0.26Cr,
0.028Nb, 0.018Zr, 0.038V, 0.021Y, 0.017S, 0.025P, surplus Fe.
Particular technique processing step is：
(1) outer surface of low-alloy steel bushing 3 is subjected to sandblast texturing, its outer surface roughness is reached after 120-140 μm,
The volume ratio of outer surface coating boric acid solution, boric acid solution mesoboric acid and water is 1:5.5, the coating thickness of boric acid solution is 0.7-
0.9mm；
(2) the low-alloy steel bushing 3 after outer surface sandblast texturing and coating boric acid solution is added using line-frequency induction heater
Load casting mold after hot to 800-900 DEG C, then cast cast abrasion-resistant alloy liquation, low-alloy during cast cast abrasion-resistant alloy liquation
The temperature of steel bushing 3 is not less than 450 DEG C, and 1559 DEG C of cast abrasion-resistant alloy liquation pouring temperature, cast abrasion-resistant alloy liquation cast 2 is small
Shi Hou, unpacks and removes casting, obtains composite roll set blank, composite roll set blank is entered into stove heat to 550 DEG C, after being incubated 8 hours
Temperature is furnace-cooled to less than 180 DEG C, comes out of the stove and is air-cooled to room temperature, then carrying out machining to the composite roll set blank after heat treatment obtains
Composite roll set is obtained, composite roll is covered the thickness of outer layer cast abrasion-resistant alloy 2 and reaches 75mm, the thickness of internal layer low-alloy steel bushing 3 is 25mm；
(3) composite roll processed is inserted in stove heat to 450 DEG C, insulation is come out of the stove after 6 hours, is rolled with waste and old large-sized strip
The hot charging of roll body 1 that roller gets rid of obtained by the wearing layer of roll surface, surface coarsening layer and cracking layer is combined into one, and its magnitude of interference is
0.18mm, roll of the hot charging after compound was continued into stove heat to 380 DEG C, insulation is furnace-cooled to temperature less than 120 DEG C after 12 hours,
Come out of the stove and be air-cooled to room temperature, be finally refined to given size and precision, you can obtain the large-scale bushing roll for producing strip,
Its mechanical property is shown in Table 1.
Embodiment 3：
The present invention is using the waste and old large-sized strip roll after use, using bushing method, recovers large-sized strip roll barrel
Appearance and size and hardness, it is ensured that large-sized strip roll has excellent using effect
Composite roll set is first cast, composite roll set is cast by outer layer cast abrasion-resistant alloy 2 and internal layer low-alloy steel bushing 3 using static
The method of making is combined into one, then composite roll set and waste and old large-sized strip roll are got rid of into the wearing layer of roll surface, surface coarsening layer
It is combined into one with the hot charging of roll body 1 obtained by cracking layer, obtains the large-scale bushing roll for producing strip；
The chemical composition and its mass fraction % of outer layer cast abrasion-resistant alloy 2 be:2.14C,24.69Cr,1.79V,
1.35Mo,1.08Ni,3.28Mn,0.049Ca,0.099Mg,0.011Ce,0.107Ti,0.144N,0.051Zn,0.82Si,
0.012S, 0.029P, surplus Fe ,≤Cr/C=11.54；
The chemical composition and its mass fraction % of internal layer low-alloy steel bushing 3 be:0.22C,0.31Si,1.97Mn,0.19Cr,
0.020Nb, 0.025Zr, 0.031V, 0.034Y, 0.019S, 0.020P, surplus Fe.
Its particular technique processing step is：
(1) outer surface of low-alloy steel bushing 3 is subjected to sandblast texturing, its outer surface roughness is reached after 100-130 μm,
The volume ratio of outer surface coating boric acid solution, boric acid solution mesoboric acid and water is 1:5, the coating thickness of boric acid solution is 0.6-
0.7mm；
(2) the low-alloy steel bushing 3 after outer surface sandblast texturing and coating boric acid solution is heated using electric induction heater
Load casting mold after to 800-900 DEG C, then cast cast abrasion-resistant alloy liquation, low-alloy steel during cast cast abrasion-resistant alloy liquation
The temperature of set 3 is not less than 450 DEG C, and 1541 DEG C of cast abrasion-resistant alloy liquation pouring temperature, cast abrasion-resistant alloy liquation is poured into a mould 3 hours
Afterwards, unpack and remove casting, obtain composite roll set blank, composite roll set blank is entered into stove heat to 540 DEG C, stove after being incubated 9 hours
It is cooled to temperature less than 180 DEG C, comes out of the stove and be air-cooled to room temperature, machining acquisition then is carried out to the composite roll set blank after heat treatment
Composite roll set, makes composite roll cover the thickness of outer layer cast abrasion-resistant alloy 2 and reaches 60mm, the thickness of internal layer low-alloy steel bushing 3 is 20mm；
(3) composite roll processed is inserted in stove heat to 300 DEG C, insulation is come out of the stove after 8 hours, is rolled with waste and old large-sized strip
The hot charging of roll body 1 that roller gets rid of obtained by the wearing layer of roll surface, surface coarsening layer and cracking layer is combined into one, and its magnitude of interference is
0.15mm, roll of the hot charging after compound was continued into stove heat to 350 DEG C, insulation is furnace-cooled to temperature less than 120 DEG C after 15 hours,
Come out of the stove and be air-cooled to room temperature, be finally refined to given size and precision, you can obtain the large-scale bushing roll for producing strip,
Its mechanical property is shown in Table 1.
Table 1 is used for the large-scale bushing roll mechanical property for producing strip
The large-scale bushing roll working lining hardness that the present invention is used to produce strip is high, reaches 82-85HSD, and hardness is uniform
Property it is good, roll surface difference of hardness is less than 1.8HSD, for large strip rolling mill, and the high nickel chromium triangle generally used at present can be replaced unlimited
Chilled cast iron roll, its service life reaches the 120-125% of former roll, but production cost only has the 50-55% of former roll, this
Invention realizes the twice laid of large-scale waste and old strip roll, with obvious energy-conservation, section material effect, the popularization and application present invention into
Fruit has good economic and social benefit.
Claims (4)
1. a kind of be used to produce the large-scale bushing roll of strip, it is characterised in that the large-scale bushing roll for producing strip is
Composite roll covers the roll body hot charging got rid of with waste and old large-sized strip roll obtained by the wearing layer of roll surface, surface coarsening layer and cracking layer
It is combined into one, composite roll set is to be combined into by outer layer cast abrasion-resistant alloy and internal layer low-alloy steel bushing using static casting methods
One；
The chemical composition and its mass fraction % of outer layer cast abrasion-resistant alloy be:1.8-2.5C,18-25Cr,1.5-2.0V,1.0-
1.5Mo,1.0-1.5Ni,3.0-3.5Mn,0.03-0.06Ca,0.08-0.12Mg,0.008-0.015Ce,0.08-0.15Ti,
0.12-0.16N,0.03-0.06Zn,0.5-1.0Si,<0.04S,<0.04P, surplus Fe, 10≤Cr/C≤12；
The chemical composition and its mass fraction % of internal layer low-alloy steel bushing be:0.15-0.30C,0.17-0.40Si,1.6-
2.0Mn,0.17-0.28Cr,0.015-0.030Nb,0.018-0.029Zr,0.025-0.040V,0.02-0.04Y,<0.03S,
<0.03P, surplus Fe.
2. according to a kind of large-scale bushing roll for being used to produce strip of claim 1, it is characterised in that composite roll set outer layer casting
Make antifriction alloy thickness and reach 50-80mm, internal layer low-alloy steel bushing thickness is 15-25mm.
3. according to a kind of preparation method for being used to produce the large-scale bushing roll of strip of claim 1, it is characterised in that including
Following steps：
(1) low-alloy steel bushing outer surface is subjected to sandblast texturing, its outer surface roughness is reached after 90-140 μm, in outer surface
The volume ratio of coating boric acid solution, boric acid solution mesoboric acid and water is 1:(4.5-5.5), the coating thickness of boric acid solution is 0.6-
0.9mm；
(2) the low-alloy steel bushing after step (1) outer surface sandblast texturing and coating boric acid solution is added using electric induction heater
Load casting mold after hot to 800-900 DEG C, then cast cast abrasion-resistant alloy liquation, low-alloy during cast cast abrasion-resistant alloy liquation
The temperature of steel bushing is not less than 450 DEG C, 1530-1560 DEG C of cast abrasion-resistant alloy liquation pouring temperature, and cast abrasion-resistant alloy liquation is poured
Note is unpacked after 2-4 hours and removes casting, obtains composite roll set blank, and composite roll set blank is entered into stove heat to 520-550 DEG C,
Insulation is furnace-cooled to temperature less than 180 DEG C after 8-10 hours, come out of the stove and be air-cooled to room temperature, then covers blank to the composite roll after heat treatment
Carry out machining and obtain composite roll set；
(3) composite roll for processing step (2) is inserted in stove heat to 300~450 DEG C, and insulation is come out of the stove after 6-8 hours, and waste and old
The roll body hot charging that large-sized strip roll gets rid of obtained by the wearing layer of roll surface, surface coarsening layer and cracking layer is combined into one, will
Roll after hot charging is compound continues into stove heat to 350-380 DEG C, and insulation is furnace-cooled to temperature less than 120 DEG C after 12-15 hours, go out
Stove is air-cooled to room temperature, is finally refined to given size and precision, you can obtain the large-scale bushing roll for producing strip.
4. according to the method for claim 3, it is characterised in that its magnitude of interference of step (3) hot charging compound tense is 0.12-0.18mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510546922.7A CN105127205B (en) | 2015-08-31 | 2015-08-31 | Large-scale bushing roll for producing strip and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510546922.7A CN105127205B (en) | 2015-08-31 | 2015-08-31 | Large-scale bushing roll for producing strip and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105127205A CN105127205A (en) | 2015-12-09 |
| CN105127205B true CN105127205B (en) | 2017-08-29 |
Family
ID=54712965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510546922.7A Active CN105127205B (en) | 2015-08-31 | 2015-08-31 | Large-scale bushing roll for producing strip and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105127205B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106623861A (en) * | 2016-10-17 | 2017-05-10 | 武汉春禾科技有限公司 | Wear-resisting roll collar |
| CN107350289A (en) * | 2017-06-29 | 2017-11-17 | 太仓市钧胜轧辊有限公司 | A kind of high hardness wear-resisting type composite roll |
| CN108342657B (en) * | 2018-03-27 | 2019-06-11 | 东北大学 | A kind of high abrasion cermet composite roll set and preparation method thereof |
| CN108277436B (en) * | 2018-03-27 | 2019-06-11 | 东北大学 | A kind of high-toughness wear-resistant bimetallic composite roll set and preparation method |
| CN109047725A (en) * | 2018-08-17 | 2018-12-21 | 京港工业炉科技(苏州)有限公司 | A kind of renovation technique of high-temperature heat treatment furnace roller |
| CN109513903A (en) * | 2018-11-22 | 2019-03-26 | 湖南三泰新材料股份有限公司 | A kind of low-carbon high-boron wear-resistant alloy roll and preparation method thereof |
| CN109550787B (en) * | 2018-12-07 | 2020-02-14 | 燕山大学 | Sectional type variable interference magnitude combined cold rolling supporting roll |
| CN111438201A (en) * | 2020-04-01 | 2020-07-24 | 上海英佛曼纳米科技股份有限公司 | Cold rolling tensioning roller with wear-resistant rough and super-reduction-resistant nano coating |
| CN117226075B (en) * | 2023-10-08 | 2024-02-23 | 湖南省品源机械制造有限公司 | Manufacturing process of integrally formed bimetal cast roller |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57195517A (en) * | 1981-05-27 | 1982-12-01 | Kubota Ltd | Three-layered sleeve for h-steel rolling roll |
| JPS57195517U (en) * | 1981-06-03 | 1982-12-11 | ||
| CN2281228Y (en) * | 1995-03-10 | 1998-05-13 | 鞍山钢铁公司 | Composite support roller for cold rolling |
| CN1074323C (en) * | 1996-08-13 | 2001-11-07 | 鞍钢附企冷轧冶金设备公司 | Sleeving regeneration tech. for cold-rolling working roller |
| CN101058099A (en) * | 2006-04-21 | 2007-10-24 | 佳木斯大学 | Producing technology method for centrifugal casting composite bimetallic combination roll |
| CN100566873C (en) * | 2008-11-28 | 2009-12-09 | 北京工业大学 | A kind of straightening of kinked rail cast iron roll collar and preparation method thereof |
| CN101412105B (en) * | 2008-11-28 | 2013-03-06 | 北京工业大学 | Method for producing wear-resistant composite roller |
| CN100584475C (en) * | 2008-12-31 | 2010-01-27 | 北京工业大学 | Manufacture method for high boron high speed steel composite roll by centrifugal casting |
| CN101704024A (en) * | 2009-11-20 | 2010-05-12 | 娄底市三泰轧辊有限公司 | Hot charging thick-wall combination roller with bimetal roll cover |
| CN102251187B (en) * | 2011-07-19 | 2013-05-15 | 中材装备集团有限公司 | Production method of extrusion roller including high-speed steel |
| CN102430582B (en) * | 2011-12-29 | 2013-09-18 | 河北津西钢铁集团大方重工科技有限公司 | Manufacturing method of roll sleeve of ultra-strong wear-resistant high alloy steel roll squeezer |
| CN102615108B (en) * | 2012-04-09 | 2014-01-29 | 北京工业大学 | Centrifugal casting high-speed steel composite roll and manufacture method thereof |
| CN103008050B (en) * | 2012-10-23 | 2013-10-09 | 河北磨倒山粉磨设备有限公司 | Surfacing-free centrifugal combined ultra-high anti-abrasion roll squeezer roller sleeve and manufacturing method thereof |
| CN102962423B (en) * | 2012-11-28 | 2014-12-10 | 江苏共昌轧辊股份有限公司 | Centrifugal high-carbon, high-boron and high-speed steel composite roller shell and fabrication method of combined roller of composite roller shell |
| CN105121044B (en) * | 2013-05-02 | 2017-03-08 | 日立金属株式会社 | Centrifugal casting hot rolling composite roll |
| CN103866200B (en) * | 2013-10-28 | 2015-02-25 | 娄底市鸿亿新型耐磨材料厂（普通合伙） | High-boron high-speed steel combined roller and manufacturing method thereof |
| CN103624084B (en) * | 2013-11-20 | 2015-06-17 | 枣庄瑞兴机械制造有限公司 | Resource-saving type high-boron high-speed steel composite roll and manufacturing method thereof |
| CN104148399B (en) * | 2014-06-16 | 2016-06-22 | 枣庄瑞兴机械制造有限公司 | For abrasion-resistant roller of mill stand and preparation method thereof in steel rolling |
| CN104384193B (en) * | 2014-10-16 | 2016-11-23 | 中钢集团邢台机械轧辊有限公司 | The manufacture method of the high-speed steel planishing roll of wire and bar mill |
-
2015
- 2015-08-31 CN CN201510546922.7A patent/CN105127205B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105127205A (en) | 2015-12-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105127205B (en) | Large-scale bushing roll for producing strip and preparation method thereof | |
| CN105290703B (en) | A kind of method that hot roll is worn with submerged arc overlay welding and laser melting coating reparation | |
| CN105618715B (en) | A kind of wear-resistant high speed steel composite roll and preparation method thereof | |
| CN105562963B (en) | Lumber recovery it is higher prepare nickel-base alloy bare welding filler metal method | |
| CN101537427B (en) | Composite roll for centrifugally casting high-chromium cast iron and a preparation method thereof | |
| CN103866200B (en) | High-boron high-speed steel combined roller and manufacturing method thereof | |
| CN101265547B (en) | High-chromium-manganese cast iron roller and preparation method thereof | |
| CN105779861B (en) | A kind of wear-resisting high vanadium nitrogen high-speed steel shaped roll and its manufacture method | |
| CN101249591A (en) | Nickel-based welding wire and preparation technique thereof | |
| CN104388812A (en) | High-speed steel composite roller for rods/wires and preparation method of high-speed steel composite roller | |
| CN103418923A (en) | Overlaying repair method for worn roller | |
| CN107699831A (en) | Pack rolling as-cast state TiAl sheet alloy method based on composite structural design | |
| CN106884118A (en) | Forging Electroslag Cladding high-speed steel roll and its manufacture method | |
| CN102864372A (en) | Wear-resisting rolling mill guide and guard and manufacture method thereof | |
| CN104438337B (en) | A kind of abrasion-resistant roller for cold rolling of strip steel and preparation method thereof | |
| CN107598351A (en) | The cylindrical large area plasma overlaying method of Stellite cobalt-base alloys | |
| CN102107215A (en) | Resource-saving boron-containing high-speed steel composite roll and preparation method thereof | |
| CN104593691A (en) | Roller sleeve for large forged alloy steel carrying roller and manufacturing method thereof | |
| CN101695714A (en) | Cast steel back-up roller and preparation method thereof | |
| CN107962167B (en) | A kind of method that founding remanufactures roll | |
| CN106544596A (en) | A kind of aluminium alloying high-boron high-speed steel composite roller and preparation method thereof | |
| CN105624565A (en) | Chrome-plating-free cold roll and producing method thereof | |
| CN101892441A (en) | Ultrafine crystal grain semi-trailer axle tube material and processing method of axle tube | |
| CN104785895A (en) | Submerged arc surfacing manufacturing technology of looper roll for rolling mill | |
| CN109825773B (en) | Thick-wall high-speed steel wear-resistant roll collar and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yan Ming Inventor before: Yan Jianwen |
|
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20170717 Address after: 417000 Loudi City, Hunan province Lian bin Cun Huangnitang Louxing district public offices Applicant after: Loudi Juneng high wear-resistant materials Co. Ltd. Address before: 417000 Loudi City, Hunan province Huangnitang Lian bin Cun, Louxing District Office Applicant before: Loudi Hongyi new type abrasion resistant material factory (general partnership) |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |