CN103706921A - Build up welding repair method of supporting roller of hot continuous rolling finishing mill - Google Patents
Build up welding repair method of supporting roller of hot continuous rolling finishing mill Download PDFInfo
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- CN103706921A CN103706921A CN201310719539.8A CN201310719539A CN103706921A CN 103706921 A CN103706921 A CN 103706921A CN 201310719539 A CN201310719539 A CN 201310719539A CN 103706921 A CN103706921 A CN 103706921A
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- supporting roller
- finishing mill
- backing roll
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- 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
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
- B23K9/046—Built-up welding on three-dimensional surfaces on surfaces of revolution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
- B23K9/186—Submerged-arc welding making use of a consumable electrodes
- B23K9/188—Submerged-arc welding making use of a consumable electrodes making use of several electrodes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention relates to a build up welding repair method of a supporting roller of a hot continuous rolling finishing mill. A novel Cr-Mo-Mn-V series build up welding working layer material and a novel Cr-Mo-Mn-W series build up welding working layer material are selected, a transition layer, a middle layer and an abrasion resistance layer are sequentially arranged on the surface of the supporting roller in a build up welding mode, a build up welding repair technology is compiled in a matched mode, the temperature is monitored in real time and regulated at any time through a galvanic couple and an infrared thermometer, finally, the working performance of the supporting roller is improved, and the service life of the supporting roller is prolonged. The main technological process comprises the steps of roller blank preparation, nondestructive inspection, weld preheating, build up welding, intermediate heat treatment, finish heat treatment, roller body finishing, finished product flaw detection and inspection oiling packaging. Compared with the prior art, the build up welding repair method of the supporting roller of the hot continuous rolling finishing mill has the advantages that the repair and remanufacture problem of Cr4 and Cr5 forged steel supporting roller of the hot continuous rolling finishing mill is solved, the service life of the supporting roller is prolonged, recycling of the supporting roller is achieved, and the production cost of enterprises is effectively lowered.
Description
Technical field
The present invention relates to metallurgical technical field of steel rolling, relate in particular to a kind of hot-rolling finishing mill backing roll build-up welding repair method.
Background technology
In the hot-rolling finishing mill course of work, working roll directly contacts with rolled piece, make rolled piece generation plastic deformation, directly affect surface quality and the plate shape of strip, and backing roll has born most bending moments, plate shape impact for the stable operation, particularly Strip cross section of producing is very big.
In actual applications, the backing roll replacement cycle is long on the one hand, under operating pressure, impact, wearing and tearing, heat effect, because the factors such as work hardening, inhomogeneous, the tired micro-crack that weares and teares, the design of body of roll end-beveling are unreasonable cause backing roll surface abrasion to strengthen even local shedding, the manufacturing cost of backing roll is conventionally higher on the other hand, utilizes surface overlaying technology to repair and have more undoubtedly economy it.
The only Anshan iron and steel plant of current domestic hot continuous rolling thin Strip production and application Cr4, Cr5 support roll production line just has 5, other domestic production producer accumulative totals are more, but this kind of backing roll be there is no at present to the precedent of successfully repairing both at home and abroad, conventionally treat its diameter wearing and tearing over allowed band or peel off to lose efficacy because of roll surface large area to scrap.
Summary of the invention
The present invention overcomes the deficiencies in the prior art, and a kind of hot-rolling finishing mill backing roll build-up welding repair method is provided, and the reparation that solves hot-rolling finishing mill Cr4, Cr5 support roll is manufacturing issue again, extends backing roll service life, effectively reduces enterprise's production cost.
In order to achieve the above object, the present invention realizes by the following technical solutions:
The hot-rolling finishing mill backing roll build-up welding repair method that the present invention proposes, that to select novel Cr-Mo-Mn-V and Cr-Mo-Mn-W be built-up welding working layer, and supporting establishment build-up welding repair process, adopt galvanic couple, infrared radiation thermometer that temperature is monitored in real time, regulated at any time, finally reach or improve backing roll service behaviour and requirement in service life.
The hot-rolling finishing mill backing roll build-up welding repair method that the present invention proposes is built-up welding trilaminate material successively on backing roll surface: transition zone, intermediate layer, wearing layer.
(1) transition zone welding material (Y15-S welding wire+SF62 solder flux)
Backing roll mother metal phosphorus content is high, and solderability is poor, and the effect of transition zone welding material is dilution phosphorus content, guarantees carrying out smoothly of next step built-up welding.
The alloy system chemical analysis of transition zone welding material is by weight percentage:
All the other are Fe
(2) intermediate layer welding material (Y25-S welding wire+SF62 solder flux)
The effect of intermediate layer welding material is toughness and the strength matching that makes mother metal and overlay cladding faying face, reduces fragility.
The alloy system chemical analysis of intermediate layer welding material is by weight percentage:
All the other are Fe
(3) welding of wear-resisting layers material (Y23-S welding wire+SF62 solder flux)
The effect of welding of wear-resisting layers material is to make backing roll surface obtain the wear-resisting working lining of high strength, high tenacity.
The alloy system chemical analysis of welding of wear-resisting layers material is by weight percentage:
All the other are Fe
In the present invention, the built-up welding thickness of above-mentioned trilaminate material is generally:
Transition zone: 4-8mm
Intermediate layer: 4-16mm
Wearing layer: 50-85mm
Hot-rolling finishing mill backing roll build-up welding repair method concrete steps of the present invention are as follows:
1. roller stock is reorganized and outfit:
Object is that the defect of roll surface of backing roll and fatigue layer are removed, and is machined to and meets overlay cladding thickness requirement size, adopts turning and local abrasive machine polishing mode to carry out;
2. nondestructive inspection detects:
The roller stock of having reorganized and outfit is carried out to penetrant inspection and ultrasound examination, object is to check whether fatigue layer is removed completely and whether the body of roll exists defects i.e.cracks, if still defectiveness needs further processing to be eliminated, if ultrasonic examination shows in the body of roll, there is major defect, should do and scrap processing and no longer carry out built-up welding reparation;
3. weld preheating:
The object of weld preheating is to reduce the cooling velocity of deposited metal and heat affected area in weld deposit process, reduce tendency of hardenability and reduce welding stress, prevent that roller stock mother metal and resurfacing welding material from the crackle causing because of transformation stress occurring in weld deposit process, preheat temperature is determined according to phosphorus content and the alloy content of mother metal and resurfacing welding material.
Roller stock to be welded is packed into preheating in the electric furnace that is equipped with automatic temperature measurement system, programming rate 50-80 ℃/h, preheating insulation temperature 300-400 ℃, is incubated 10 hours, and concrete numerical basis roller stock chemical analysis and roller stock diameter are determined.
4. built-up welding:
Use build-up welding apparatus to carry out multi-machine heads monofilament circumferencial direction continuous helical automatical hidden arc overlay welding, weld deposit process must guarantee to work continuously, do not allow to stop weldering midway, while stopping welding as fortuitous event, should be by the requirement of stipulating in step 3 weld preheating again preheating, to guarantee the uniformity of hardness between each overlay cladding;
Before built-up welding, the solder flux of selecting is cured, to remove moisture content, select
flux-cored wire, solder flux model is SF62.
Welding process requirement:
Welding current: 300-500A
Weldingvoltage: 25-35V
Speed of welding: 8-16min/r
Electrode extension: 15-40mm
Welding wire eccentric throw: 30mm
Welding bead amount of lap: 30-60%
Welding bead interlayer temperature 260-450 ℃
5. intermediate heat-treatment:
Because hot continuous rolling finish rolling backing roll built-up welding thickness is larger, if once complete continuous weld deposit process, can make deposited metal produce very large transformation stress and welding stress, greatly increase the probability that backing roll cracks, when serious, also can cause backing roll cracking to scrap, therefore when resurfacing welding material thickness reaches 25-30mm, need carry out centre destressing heat treatment, to reduce or to eliminate cumulative stress.50 ℃/h of intermediate heat-treatment programming rate, holding temperature 480-600 ℃, temperature retention time 3 hours, 50 ℃/h of cooling velocity starts built-up welding to interlayer temperature;
6. final heat treatment:
Final heat treatment is the heat treatment process of carrying out after weld deposit process all completes, and object is in order to improve postwelding metallographic structure and to eliminate welding stress.Final 40 ℃/h of heat treatment programming rate, holding temperature 500-610 ℃, temperature retention time 10 hours, 40 ℃/h of cooling velocity comes out of the stove to room temperature;
7. body of roll finishing:
Through final heat treated backing roll, by finished product drawing requirement, carry out turning processing;
8. finished product nondestructive inspection detects:
Object is check surfacing layer quality, confirms the defects such as overlay cladding surface and inner flawless, pore, slag inclusion;
9. product inspection, oiling, packing.
Compared with prior art, the invention has the beneficial effects as follows:
The reparation that solves hot-rolling finishing mill Cr4, Cr5 support roll is manufacturing issue again, extends backing roll service life, realizes the recycling of backing roll, effectively reduces enterprise's production cost.
Accompanying drawing explanation
Fig. 1 is technical process flow process figure of the present invention.
Fig. 2 is intermediate heat-treatment process schematic diagram of the present invention.
Fig. 3 is final heat treatment process schematic diagram of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
The hot-rolling finishing mill backing roll build-up welding repair method that the present invention proposes, that to select novel Cr-Mo-Mn-V and Cr-Mo-Mn-W be built-up welding working layer, and supporting establishment build-up welding repair process, adopt galvanic couple, infrared radiation thermometer that temperature is monitored in real time, regulated at any time, finally reach or improve backing roll service behaviour and requirement in service life.
The hot-rolling finishing mill backing roll build-up welding repair method that the present invention proposes is built-up welding trilaminate material successively on backing roll surface: transition zone, intermediate layer, wearing layer.
(1) transition zone welding material (Y15-S welding wire+SF62 solder flux)
Backing roll mother metal phosphorus content is high, and solderability is poor, and the effect of transition zone welding material is dilution phosphorus content, guarantees carrying out smoothly of next step built-up welding.
The alloy system chemical analysis of transition zone welding material is by weight percentage:
All the other are Fe
(2) intermediate layer welding material (Y25-S welding wire+SF62 solder flux)
The effect of intermediate layer welding material is toughness and the strength matching that makes mother metal and overlay cladding faying face, reduces fragility.
The alloy system chemical analysis of intermediate layer welding material is by weight percentage:
All the other are Fe
(3) welding of wear-resisting layers material (Y23-S welding wire+SF62 solder flux)
The effect of welding of wear-resisting layers material is to make backing roll surface obtain the wear-resisting working lining of high strength, high tenacity.
The alloy system chemical analysis of welding of wear-resisting layers material is by weight percentage:
All the other are Fe
In the present invention, the built-up welding thickness of above-mentioned trilaminate material is generally:
Transition zone: 4-8mm
Intermediate layer: 4-16mm
Wearing layer: 50-85mm
Hot-rolling finishing mill backing roll build-up welding repair method concrete steps of the present invention are as follows:
1. roller stock is reorganized and outfit:
Object is that the defect of roll surface of backing roll and fatigue layer are removed, and is machined to and meets overlay cladding thickness requirement size, adopts turning and local abrasive machine polishing mode to carry out;
2. nondestructive inspection detects:
The roller stock of having reorganized and outfit is carried out to penetrant inspection and ultrasound examination, object is to check whether fatigue layer is removed completely and whether the body of roll exists defects i.e.cracks, if still defectiveness needs further processing to be eliminated, if ultrasonic examination shows in the body of roll, there is major defect, should do and scrap processing and no longer carry out built-up welding reparation;
3. weld preheating:
The object of weld preheating is to reduce the cooling velocity of deposited metal and heat affected area in weld deposit process, reduce tendency of hardenability and reduce welding stress, prevent that roller stock mother metal and resurfacing welding material from the crackle causing because of transformation stress occurring in weld deposit process, preheat temperature is determined according to phosphorus content and the alloy content of mother metal and resurfacing welding material.
Roller stock to be welded is packed into preheating in the electric furnace that is equipped with automatic temperature measurement system, programming rate 50-80 ℃/h, preheating insulation temperature 300-400 ℃, is incubated 10 hours, and concrete numerical basis roller stock chemical analysis and roller stock diameter are determined.
4. built-up welding:
Use build-up welding apparatus to carry out multi-machine heads monofilament circumferencial direction continuous helical automatical hidden arc overlay welding, weld deposit process must guarantee to work continuously, do not allow to stop weldering midway, while stopping welding as fortuitous event, should be by the requirement of stipulating in step 3 weld preheating again preheating, to guarantee the uniformity of hardness between each overlay cladding;
Before built-up welding, the solder flux of selecting is cured, to remove moisture content, select
flux-cored wire, solder flux model is SF62.
Welding process requirement:
Welding current: 300-500A
Weldingvoltage: 25-35V
Speed of welding: 8-16min/r
Electrode extension: 15-40mm
Welding wire eccentric throw: 30mm
Welding bead amount of lap: 30-60%
Welding bead interlayer temperature 260-450 ℃
5. intermediate heat-treatment:
Because hot continuous rolling finish rolling backing roll built-up welding thickness is larger, if once complete continuous weld deposit process, can make deposited metal produce very large transformation stress and welding stress, greatly increase the probability that backing roll cracks, when serious, also can cause backing roll cracking to scrap, therefore when resurfacing welding material thickness reaches 25-30mm, need carry out centre destressing heat treatment, to reduce or to eliminate cumulative stress.50 ℃/h of intermediate heat-treatment programming rate, holding temperature 480-600 ℃, temperature retention time 3 hours, 50 ℃/h of cooling velocity starts built-up welding to interlayer temperature;
6. final heat treatment:
Final heat treatment is the heat treatment process of carrying out after weld deposit process all completes, and object is in order to improve postwelding metallographic structure and to eliminate welding stress.Final 40 ℃/h of heat treatment programming rate, holding temperature 500-610 ℃, temperature retention time 10 hours, 40 ℃/h of cooling velocity comes out of the stove to room temperature;
7. body of roll finishing:
Through final heat treated backing roll, by finished product drawing requirement, carry out turning processing;
8. finished product nondestructive inspection detects:
Object is check surfacing layer quality, confirms the defects such as overlay cladding surface and inner flawless, pore, slag inclusion;
9. product inspection, oiling, packing.
Use restorative procedure of the present invention to make backing roll improve 1～2 times service life, the cost of repairing backing roll is the 30-40% that purchases new backing roll cost, and can repair more than 3 times, has good economic benefit and social benefit.
Following examples are implemented take technical solution of the present invention under prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention are not limited to following embodiment.In following embodiment, method therefor is conventional method if no special instructions.
[01] 3 backing roll built-up welding of embodiment 1 Anshan iron and steel plant 1700 line finishing mill are repaired
1, selected Y15-S welding wire as transition zone, Y25-S welding wire as intermediate layer, Y23-S welding wire as wearing layer, select SF62 sintered flux as built-up welding solder flux.
2, ultrasonic wave and penetrant inspection are carried out in pair roller footpath, if find that there is major defect (particularly roller footpath and body of roll transitional region, if there is defects i.e.cracks), this roller is not suitable for carrying out built-up welding reparation.
3, fatigue layer and the defects i.e.cracks on finishing mill backing roll to be repaired surface removed in processing.
4, roll surface fatigue layer is removed completely, and turning is to the following 20mm of working lining.
5, defect, compared with depths, adopts transition zone and intermediate layer material to carry out soldering, makes it smooth.
6, the roll surface after turning is carried out to penetrant inspection and ultrasonic examination, check in roll surface and roller whether also have defects i.e.cracks, if defectiveness still needs to continue turning, remove a hidden danger.If ultrasonic examination finds there is major defect in roller, do not allow to carry out again the built-up welding repair of this roller stock.
7, to finishing mill backing roll preheating to be repaired, temperature is 400 ℃, and interlayer temperature is controlled at more than 300 ℃.
8, adopt the flux-cored wire of Φ 3.2mm, welding current 480A, weldingvoltage 28V, speed of welding 12 minutes/turn.
9, when throat thickness reaches 30mm, carry out intermediate heat-treatment, after having welded, also need to carry out slow cooling.
10, postwelding must carry out final heat treatment, and temperature is made as 580 ℃, and temperature retention time is made as 10 hours.
11, after cool to room temperature, backing roll is carried out to turning processing by drawing, roll surface is reserved 1mm grinding allowance.
12, roll surface is carried out to hardness detection, penetrant inspection and ultrasonic examination, if can not reach requirement, need re-start built-up welding reparation.
13, qualified backing roll is cleared up, oiling, packing.
[02] 7 backing roll built-up welding of embodiment 2 Anshan iron and steel plant 1700 line finishing mill are repaired
1, selected Y15-S welding wire as transition zone, Y25-S welding wire as intermediate layer, Y23-S welding wire as wearing layer, select SF62 sintered flux as built-up welding solder flux.
2, ultrasonic wave and penetrant inspection are carried out in pair roller footpath, if find that there is major defect (particularly roller footpath and body of roll transitional region, if there is defects i.e.cracks), this roller is not suitable for carrying out built-up welding reparation.
3, fatigue layer and the defects i.e.cracks on finishing mill backing roll to be repaired surface removed in processing.
4, roll surface fatigue layer is removed completely, and turning is to the following 20mm of working lining.
5, defect, compared with depths, adopts transition zone and intermediate layer material to carry out soldering, makes it smooth.
6, the roll surface after turning is carried out to penetrant inspection and ultrasonic examination, check in roll surface and roller whether also have defects i.e.cracks, if defectiveness still needs to continue turning, remove a hidden danger.If ultrasonic examination finds there is major defect in roller, do not allow to carry out again the built-up welding repair of this roller stock.
7, to finishing mill backing roll preheating to be repaired, temperature is 300 ℃, and interlayer temperature is controlled at more than 280 ℃.
8, adopt the flux-cored wire of Φ 3.2mm, welding current 300A, weldingvoltage 26V, speed of welding 10 minutes/turn.
9, when throat thickness reaches 30mm, carry out intermediate heat-treatment, after having welded, also need to carry out slow cooling.
10, postwelding must carry out final heat treatment, and temperature is made as 510 ℃, and temperature retention time is made as 10 hours.
11, after cool to room temperature, backing roll is carried out to turning processing by drawing, roll surface is reserved 1mm grinding allowance.
12, roll surface is carried out to hardness detection, penetrant inspection and ultrasonic examination, if can not reach requirement, need re-start built-up welding reparation.
13, qualified backing roll is cleared up, oiling, packing.
Claims (3)
1. hot-rolling finishing mill backing roll build-up welding repair method, it is characterized in that, the hot-rolling finishing mill backing roll build-up welding repair method that the present invention proposes, built-up welding transition zone, intermediate layer, wearing layer trilaminate material successively on backing roll surface, the alloy system chemical analysis of this trilaminate material by weight percentage:
Transition zone welding material: Y15-S welding wire+SF62 solder flux
All the other are Fe
Intermediate layer welding material: Y25-S welding wire+SF62 solder flux
All the other are Fe
Welding of wear-resisting layers material: Y23-S welding wire+SF62 solder flux
All the other are Fe.
2. a kind of hot-rolling finishing mill backing roll build-up welding repair method according to claim 1, is characterized in that, the built-up welding thickness of above-mentioned trilaminate material is generally:
Transition zone: 4-8mm
Intermediate layer: 4-16mm
Wearing layer: 50-85mm.
3. a kind of hot-rolling finishing mill backing roll build-up welding repair method according to claim 1, is characterized in that, this restorative procedure technical process and main technologic parameters are as follows:
(1) roller stock is reorganized and outfit;
(2) nondestructive inspection detects;
(3) weld preheating; Programming rate 50-80 ℃/h, preheating insulation temperature 300-400 ℃, is incubated 10 hours;
(4) built-up welding:
Welding process requirement:
Welding current: 300-500A
Weldingvoltage: 25-35V
Speed of welding: 8-16min/r
Electrode extension: 15-40mm
Welding wire eccentric throw: 30mm
Welding bead amount of lap: 30-60%
Welding bead interlayer temperature 260-450 ℃
(5) intermediate heat-treatment:
50 ℃/h of programming rate, holding temperature 480-600 ℃, temperature retention time 3 hours, 50 ℃/h of cooling velocity starts built-up welding to interlayer temperature;
(6) final heat treatment:
40 ℃/h of programming rate, holding temperature 500-610 ℃, temperature retention time 10 hours, 40 ℃/h of cooling velocity comes out of the stove to room temperature;
(7) body of roll finishing;
(8) finished product nondestructive inspection detects;
(9) product inspection, oiling, packing.
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| CN108655538A (en) * | 2018-05-08 | 2018-10-16 | 大唐洛阳首阳山发电有限责任公司 | The overlaying method of MPS-200 Roller of Coal Grinder, lining tile |
| CN109434320A (en) * | 2018-11-27 | 2019-03-08 | 安徽泰尔表面工程技术有限公司 | A kind of wear-resisting welding wire with flux core and the method that part is repaired using it |
| CN109570695A (en) * | 2018-12-04 | 2019-04-05 | 四川川润液压润滑设备有限公司 | Process method for H3Cr13 surfacing on surface of 45 steel |
| CN112139756A (en) * | 2020-09-29 | 2020-12-29 | 南京合泰机械制造有限公司 | Large-thickness surfacing repair layer of large 70Cr3Mo supporting roller and repair process |
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