CN101722385A - Flux-cored wire and method for welding hot-rolled back-up roll by same - Google Patents
Flux-cored wire and method for welding hot-rolled back-up roll by same Download PDFInfo
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- CN101722385A CN101722385A CN200810225404A CN200810225404A CN101722385A CN 101722385 A CN101722385 A CN 101722385A CN 200810225404 A CN200810225404 A CN 200810225404A CN 200810225404 A CN200810225404 A CN 200810225404A CN 101722385 A CN101722385 A CN 101722385A
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- welding
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- cored wire
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Abstract
The invention discloses a flux-cored wire and a method for welding a hot-rolled back-up roll by the same, and relates to the welding technology. By using an iron-based steel strip as a sheath, the flux-cored wire comprises the following components in percentage by mass: 0.15 to 0.60 percent of carbon, 0.10 to 2.00 percent of silicon, 0.15 to 2.00 percent of manganese, 2.50 to 7.00 percent of chromium, 0.50 to 2.50 percent of molybdenum, 0.30 to 3.50 percent of tungsten, 0.20 to 1.00 percent of vanadium, 0.20 to 3.00 percent of nickel, 0 to 0.03 percent of sulfur, 0 to 0.03 percent of phosphorus, and the balance of iron. The flux-cored wire needs to keep the surfacing interpass temperature of the cold-rolled back-up roll between 300 and 350 DEG C during constant temperature surfacing work. The flux-cored wire well solves the problem that the intensity of a surfacing material is not matched with the toughness after surfacing of the cold-rolled work roll, so that the hot-rolled back-up roll has high intensity and excellent toughness. Therefore, the service life of the hot-rolled back-up roll is improved.
Description
Technical field
The present invention relates to welding technology field, specifically, relate to a kind of flux-cored wire of welding hot-rolled backing roll, and utilize above-mentioned flux-cored wire to carry out the method for welding hot-rolled backing roll.
Background technology
The hot rolling backing roll is the large-scale metallurgical spare part, used material mainly contains 50CrMo, 60CrNiMo, 60CrMnMo, 70Cr3Mo, 45Cr4NiMoV, Cr5 etc. both at home and abroad, failure reasons mainly is at heavy load, the alternating hot and cold state down during work, is subjected to the influence (adding the segregation of top mother metal composition and the defective on the manufacturing process) of the rolling steel grade variation of institute to make its roll surface very easily produce the gathering of the residual stress of local certain depth.As time goes on, extend to the lamellar tearing of local aspect gradually by point, in addition the generation of crackle, finally cause large-area coming off, therefore the technology for repairing surfacing of large-scale hot rolling backing roll requires height, and difficulty is big.After present most hot rolling backing roll uses and scraps size, many producers of the compound manufacture view of built-up welding and R﹠D institution are all attempting, subject matter is that the obdurability of resurfacing welding material can not mate well, and causing the subject matter that exists in the course of work is problems such as local shedding, wearability deficiency and crackle.
Summary of the invention
The object of the present invention is to provide a kind of method that is used for the flux-cored wire and the welding hot-rolled backing roll thereof of welding hot-rolled backing roll, to solve the hot rolling backing roll after built-up welding is repaired, problems such as the local shedding of existence, wearability deficiency and crackle.Flux-cored wire of the present invention adopts multi-component alloying, has improved intensity, toughness and the anti-wear performance of deposited metal.
For achieving the above object, technical solution of the present invention is:
A kind of flux-cored wire is a crust with the iron-based steel band, is used for welding hot-rolled backing roll; Its medicine core component is by mass percentage: carbon: 0.15～0.60%, silicon: 0.10～2.00%, manganese: 0.15～2.00%, chromium: 2.50～7.00, molybdenum: 0.50～2.50%, tungsten: 0.30～3.50%, vanadium: 0.20～1.00%, nickel: 0.20～3.00%, sulphur: 0～0.03%, phosphorus: 0～0.03%, surplus is an iron.
Described flux-cored wire, the granularity of its described medicine core component is 60～120 orders.
Described flux-cored wire, its described flux-cored wire is a flux cored wire, external diameter is 2.4～4.0mm.
The method of the welding hot-rolled backing roll of a kind of described flux-cored wire the steps include:
A) the hot rolling backing roll that will treat built-up welding is preheating to 350～450 ℃, and is incubated under this temperature;
B) carry out constant temperature built-up welding operation with flux-cored wire, keep hot rolling backing roll built-up welding interlayer temperature between 300～350 ℃;
C) when overlay cladding is thicker, when the every continuous welding of overlay cladding thickness reaches diametric(al) increase by 40～50mm, carry out intermediate heat-treatment one time, temperature is 450 ℃; Continue to keep interlayer temperature then between 300～350 ℃, carry out constant temperature built-up welding operation, repeatedly repeatedly, until the built-up welding diameter greater than required finished diameter size 4～8mm;
D), when being heated to 500 ℃, carry out tempering heat treatment by the firing rate that per hour is no more than 50 ℃ with the hot rolling backing roll after the constant temperature built-up welding;
E) cool to taking-up below 50 ℃ with the furnace, cooling velocity per hour is no more than 30 ℃;
F) hot rolling backing roll that built-up welding is good is machined to and requires size;
G) nondestructive inspection and hardness test are carried out in the built-up welding surface of hot rolling backing roll.
Described method, its described A) treats the hot rolling backing roll of built-up welding in the step, be meant hot rolling backing roll or the new hot rolling backing roll of making of using dimension limit.
Described method, its described A) before the step, also comprise a step: the hot rolling backing roll for the treatment of built-up welding is detected a flaw.
Described method, its described flaw detection are to adopt magnetic and ultrasonic carrying out.
Described method, its described C) in the step when overlay cladding is thicker, be meant when the overlay cladding diameter is 60～150mm.
Described method, its described E) processing in the step, be adopt that lathe is rough turn, finish turning and grinding machine correct grinding.
Described method, its described A) be incubated hourage, C in the step) step and D) tempering hourage in the step, calculated by following formula:
Time
Wherein:
Be the diameter of roll, unit: mm, K are coefficient: 50.4, and unit: mm/ hour.
The method of flux-cored wire provided by the invention and welding hot-rolled backing roll thereof, when hot rolling backing roll REPAIR WELDING, operating procedure is simple, does not have the welding defective.Hot rolling backing roll after the reparation can reduce cost about 50% than former hot rolling backing roll.Its anti-wear performance of hot rolling backing roll and obdurability through repairing have improved 1.5～2 times, have improved the service life of hot rolling backing roll greatly.
The specific embodiment
Embodiment 1: be used to repair tensile strength 〉=800N/mm
2The hot rolling backing roll of 60CrNiMo series.
Flux-cored wire of the present invention, according to the requirement of hot rolling backing roll serviceability, select following alloy powder: ferrochrome, tungsten carbide, molybdenum-iron, ferrosilicon, vanadium iron, ferronickel, iron powder, ferrotungsten, its granularity is 60～120 orders, pack into after evenly mixing in proportion in the distributing device of flux-cored wire wire rolling mill, when wire rolling mill is worked that mixed uniformly powder is stable and be sprinkling upon equably and wrap up into tubulose on the flux-cored wire foreskin steel band, carry out drawing through wire drawing machine again, make external diameter and be
The tubulose flux-cored wire; The chemical composition of flux-cored wire should be controlled at by mass percentage:
Carbon (C): silicon (Si) 0.20%: manganese (Mn) 0.80%: chromium (Cr) 0.30%: 3.00, molybdenum (Mo): tungsten (W) 1.50%: vanadium (V) 0.50%: nickel (Ni) 0.20%: 1.00%, sulphur: phosphorus 0.15%: 0.18%, surplus is an iron.
Embodiment 2: be used to repair tensile strength 〉=1000N/mm
2The hot rolling backing roll of 70Cr3Mo series.
It is 60～120 orders that ferrochrome, tungsten carbide, molybdenum-iron, ferrosilicon, vanadium iron, ferronickel, iron powder and ferro-tungsten powder are processed into granularity, after evenly mixing, ratio packs in the distributing device of flux-cored wire wire rolling mill, when wire rolling mill is worked that mixed uniformly powder is stable and be sprinkling upon equably and wrap up into tubulose on the flux-cored wire foreskin steel band, the process wire drawing machine carries out drawing again, makes external diameter and is
The tubulose flux-cored wire; The chemical composition of tubulose flux-cored wire should be controlled at by mass percentage:
C:0.25%, Si:0.70%, Mn:0.40%, Cr:3.50, Mo:1.50%, W:0.50%, V:0.20%, Ni:1.50%, sulphur: phosphorus 0.15%: 0.18%, surplus is an iron.
Embodiment 3: repair tensile strength 〉=1000N/mm
2The hot rolling backing roll of 45Cr4NiMoV series.
It is 60～120 orders that ferrochrome, tungsten carbide, molybdenum-iron, ferrosilicon, vanadium iron, ferronickel, iron powder and ferro-tungsten powder are processed into granularity, after evenly mixing, ratio packs in the distributing device of flux-cored wire wire rolling mill, when wire rolling mill is worked that mixed uniformly powder is stable and be sprinkling upon equably and wrap up into tubulose on the flux-cored wire foreskin steel band, the process wire drawing machine carries out drawing again, makes external diameter and is
The tubulose flux-cored wire; The chemical composition of tubulose flux-cored wire should be controlled at by mass percentage:
C:0.30%, Si:0.70%, Mn:0.40%, Cr:4.00, Mo:1.50%, W:0.30%, V:0.40%, Ni:1.00%, sulphur: phosphorus 0.15%: 0.18%, surplus is an iron.
Embodiment 4: repair tensile strength 〉=1000N/mm
2The hot rolling backing roll of Cr5 series.
It is 60～120 orders that ferrochrome, tungsten carbide, molybdenum-iron, ferrosilicon, vanadium iron, ferronickel, iron powder and ferro-tungsten powder are processed into granularity, after evenly mixing, ratio packs in the distributing device of flux-cored wire wire rolling mill, when wire rolling mill is worked that mixed uniformly powder is stable and be sprinkling upon equably and wrap up into tubulose on the flux-cored wire foreskin steel band, the process wire drawing machine carries out drawing again, makes external diameter and is
The tubulose flux-cored wire; The chemical composition of tubulose flux-cored wire should be controlled at by mass percentage:
C:0.30%, Si:0.70%, Mn:0.40%, Cr:5.20, Mo:1.50%, W:0.60%, V:0.50%, Ni:1.20%, sulphur: phosphorus 0.15%: 0.18%, surplus is an iron.
Embodiment 5: repair tensile strength 〉=1100N/mm
2The hot rolling backing roll of 45Cr4NiMoV series, hot rolling backing roll specification is
(roll surface width).Fatigue layer is fallen in the hot rolling backing roll turning that uses dimension limit, is adopted following method to carry out the built-up welding reparation:
1, machined and Non-Destructive Testing: old hot rolling backing roll or the new middle-low alloy steel hot rolling backing roll of making that will use dimension limit are machined into size to be welded, through magnetic and ultrasonic inspection, guarantee the hot rolling backing roll zero defect for the treatment of that built-up welding is made.
2, preheating: the flawless hot rolling backing roll of will detecting a flaw is preheating between 350～450 ℃, and insulation under this temperature 17 hours.
3, constant temperature built-up welding operation: adopt special-purpose hot rolling backing roll to repair and the manufacturing flux-cored wire special, keep hot rolling backing roll built-up welding interlayer temperature between 300～350 ℃, carry out constant temperature built-up welding operation, built-up welding to diameter is
Between.
4, when overlay cladding thicker (during diametric(al) 60～150mm), reach diametric(al) 40～50mm in the every continuous welding of overlay cladding thickness and carry out intermediate heat-treatment one time, temperature is 450 ℃ of X 17 hours, continue then to keep interlayer temperature between 300～350 ℃, carry out constant temperature built-up welding operation, repeatedly repeatedly, until built-up welding to diameter be
Between.
5, post weld heat treatment: with the hot rolling backing roll after the constant temperature built-up welding, put into heat-treatment furnace and be heated to 500 ℃ of tempering heat treatment of carrying out 17 hours, should control firing rate in the heating process and be no more than per hour 50 ℃, cool off with stove then, should control cooling velocity in the cooling procedure and be no more than per hour 30 ℃, to be cooledly can come out of the stove to time below 50 ℃.
6, postwelding machined: the hot rolling backing roll that built-up welding is good carries out that lathe is rough turn, finish turning and grinding machine correct grinding.Until being machined to hot rolling backing roll drawing requirement size diameter be
7, Non-Destructive Testing and hardness test: nondestructive inspection and hardness test are carried out in the hot rolling backing roll built-up welding surface that processes, and examination criteria and hardness require to satisfy hot rolling backing roll drawing performance requirement.
Embodiment 6: repair tensile strength 〉=1100N/mm
2The hot rolling backing roll of Cr5 series,
Hot rolling backing roll specification is
(roll surface width).Fatigue layer is fallen in the hot rolling backing roll turning that uses dimension limit, is adopted following method to carry out the built-up welding reparation:
1, machined and Non-Destructive Testing: old hot rolling backing roll or the new middle-low alloy steel hot rolling backing roll of making that will use dimension limit are machined into size to be welded, through magnetic and ultrasonic inspection, guarantee the hot rolling backing roll zero defect for the treatment of that built-up welding is made.
2, preheating: the flawless hot rolling backing roll of will detecting a flaw is preheating between 350～450 ℃, and insulation under this temperature 28 hours.
3, constant temperature built-up welding operation: adopt special-purpose hot rolling backing roll to repair and the manufacturing flux-cored wire special, keep hot rolling backing roll built-up welding interlayer temperature between 300～350 ℃, carry out constant temperature built-up welding operation, built-up welding to diameter is
Between.
4, when overlay cladding thicker (during diametric(al) 60～150mm), reach diametric(al) 40～50mm in the every continuous welding of overlay cladding thickness and carry out intermediate heat-treatment one time, temperature is 450 ℃ of X 28 hours, continue then to keep interlayer temperature between 300～350 ℃, carry out constant temperature built-up welding operation, repeatedly repeatedly, until built-up welding to diameter be
Between.
5, post weld heat treatment: with the hot rolling backing roll after the constant temperature built-up welding, put into heat-treatment furnace and be heated to 500 ℃ of tempering heat treatment of carrying out 28 hours, should control firing rate in the heating process and be no more than per hour 50 ℃, cool off with stove then, should control cooling velocity in the cooling procedure and be no more than per hour 30 ℃, to be cooledly can come out of the stove to time below 50 ℃.
6, postwelding machined: the hot rolling backing roll that built-up welding is good carries out that lathe is rough turn, finish turning and grinding machine correct grinding.Until being machined to hot rolling backing roll drawing requirement size diameter be
Claims (10)
1. a flux-cored wire is a crust with the iron-based steel band, is used for welding hot-rolled backing roll; It is characterized in that this medicine core component is by mass percentage: carbon: 0.15～0.60%, silicon: 0.10～2.00%, manganese: 0.15～2.00%, chromium: 2.50～7.00, molybdenum: 0.50～2.50%, tungsten: 0.30～3.50%, vanadium: 0.20～1.00%, nickel: 0.20～3.00%, sulphur: 0～0.03%, phosphorus: 0～0.03%, surplus is an iron.
2. flux-cored wire as claimed in claim 1 is characterized in that, the granularity of described medicine core component is 60～120 orders.
3. flux-cored wire as claimed in claim 1 or 2 is characterized in that, described flux-cored wire is a flux cored wire, and external diameter is 2.4～4.0mm.
4. method of utilizing the welding hot-rolled backing roll of the described flux-cored wire of claim 1 is characterized in that step is:
A) the hot rolling backing roll that will treat built-up welding is preheating to 350～450 ℃, and is incubated under this temperature;
B) carry out constant temperature built-up welding operation with flux-cored wire, keep hot rolling backing roll built-up welding interlayer temperature between 300～350 ℃;
C) when overlay cladding is thicker, when the every continuous welding of overlay cladding thickness reaches diametric(al) increase by 40～50mm, carry out intermediate heat-treatment one time, temperature is 450 ℃; Continue to keep interlayer temperature then between 300～350 ℃, carry out constant temperature built-up welding operation, repeatedly repeatedly, until the built-up welding diameter greater than required finished diameter size 4～8mm;
D), when being heated to 500 ℃, carry out tempering heat treatment by the firing rate that per hour is no more than 50 ℃ with the hot rolling backing roll after the constant temperature built-up welding;
E) cool to taking-up below 50 ℃ with the furnace, cooling velocity per hour is no more than 30 ℃;
F) hot rolling backing roll that built-up welding is good is machined to and requires size;
G) nondestructive inspection and hardness test are carried out in the built-up welding surface of hot rolling backing roll.
5. method as claimed in claim 4 is characterized in that, described A) treat in the step hot rolling backing roll of built-up welding to be meant hot rolling backing roll or the new hot rolling backing roll of making of using dimension limit.
6. method as claimed in claim 4 is characterized in that, described A) before the step, also comprise a step: the hot rolling backing roll for the treatment of built-up welding is detected a flaw.
7. method as claimed in claim 6 is characterized in that, described flaw detection is to adopt magnetic and ultrasonic carrying out.
8. method as claimed in claim 4 is characterized in that, described C) in the step when overlay cladding is thicker, be meant when the overlay cladding diameter is 60～150mm.
9. wait to require 4 described methods as right, it is characterized in that, described E) processing in the step, be adopt that lathe is rough turn, finish turning and grinding machine correct grinding.
10. wait to require 4 described methods as right, it is characterized in that, described A) be incubated hourage, C in the step) step and D) tempering hourage in the step, calculate by following formula:
Time
Hour, wherein:
Be the diameter of roll, unit: mm, K are coefficient: 50.4, and unit: mm/ hour.
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| CN200810225404A CN101722385A (en) | 2008-10-29 | 2008-10-29 | Flux-cored wire and method for welding hot-rolled back-up roll by same |
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| CN200810225404A CN101722385A (en) | 2008-10-29 | 2008-10-29 | Flux-cored wire and method for welding hot-rolled back-up roll by same |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286475A (en) * | 2013-03-08 | 2013-09-11 | 秦皇岛威尔德特种焊业有限责任公司 | Flux-cored wire for surfacing repair and cold hardening resistance for hot rolled support roll |
| CN104551437A (en) * | 2014-11-13 | 2015-04-29 | 上海施威重工成套有限公司 | Manufacture technology of submerged-arc welding tubular flux-cored wire |
| CN105382378A (en) * | 2015-10-27 | 2016-03-09 | 张荣斌 | Surfacing welding method for abraded large roll shaft |
| CN105436665A (en) * | 2015-12-16 | 2016-03-30 | 秦皇岛鸿翔焊业有限公司 | Surfacing reconstructed layer of large hot-rolled supporting roll Cr4 and method for repairing roll |
| CN105478962A (en) * | 2015-12-16 | 2016-04-13 | 秦皇岛鸿翔焊业有限公司 | Overlaying rebuilt layer for large cold-rolled supporting roll 70 Cr3Mo and method for repairing roll |
| CN106392374A (en) * | 2016-12-15 | 2017-02-15 | 昆山京群焊材科技有限公司 | Metal powder type flux-cored wire for Q690 low-temperature high-strength steel |
| CN108890075A (en) * | 2018-07-16 | 2018-11-27 | 中冶建筑研究总院有限公司 | A kind of new process of compound (again) the manufacture Continuous Casting Rolls of built-up welding |
| CN114571031A (en) * | 2022-04-12 | 2022-06-03 | 福建鼎信科技有限公司 | 430 stainless steel hot-rolled conveying roller and surfacing method thereof |
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- 2008-10-29 CN CN200810225404A patent/CN101722385A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286475A (en) * | 2013-03-08 | 2013-09-11 | 秦皇岛威尔德特种焊业有限责任公司 | Flux-cored wire for surfacing repair and cold hardening resistance for hot rolled support roll |
| CN103286475B (en) * | 2013-03-08 | 2015-09-16 | 秦皇岛威尔德特种焊业有限责任公司 | A kind of flux-cored wire for hot-rolling supporting roll Bead weld repair and anti-flow harden |
| CN104551437A (en) * | 2014-11-13 | 2015-04-29 | 上海施威重工成套有限公司 | Manufacture technology of submerged-arc welding tubular flux-cored wire |
| CN104551437B (en) * | 2014-11-13 | 2016-08-17 | 上海施威重工成套有限公司 | A kind of submerged-arc welding tubulose medicated core vermicelli production technique |
| CN105382378A (en) * | 2015-10-27 | 2016-03-09 | 张荣斌 | Surfacing welding method for abraded large roll shaft |
| CN105436665A (en) * | 2015-12-16 | 2016-03-30 | 秦皇岛鸿翔焊业有限公司 | Surfacing reconstructed layer of large hot-rolled supporting roll Cr4 and method for repairing roll |
| CN105478962A (en) * | 2015-12-16 | 2016-04-13 | 秦皇岛鸿翔焊业有限公司 | Overlaying rebuilt layer for large cold-rolled supporting roll 70 Cr3Mo and method for repairing roll |
| CN105478962B (en) * | 2015-12-16 | 2017-10-31 | 秦皇岛鸿翔焊业有限公司 | The method of large-scale cold rolling backing roll 70Cr3Mo built-up welding reconstruction layer and repaired roller |
| CN106392374A (en) * | 2016-12-15 | 2017-02-15 | 昆山京群焊材科技有限公司 | Metal powder type flux-cored wire for Q690 low-temperature high-strength steel |
| CN108890075A (en) * | 2018-07-16 | 2018-11-27 | 中冶建筑研究总院有限公司 | A kind of new process of compound (again) the manufacture Continuous Casting Rolls of built-up welding |
| CN108890075B (en) * | 2018-07-16 | 2021-11-19 | 中冶建筑研究总院有限公司 | Technology for overlaying composite (re) manufacturing continuous casting roller |
| CN114571031A (en) * | 2022-04-12 | 2022-06-03 | 福建鼎信科技有限公司 | 430 stainless steel hot-rolled conveying roller and surfacing method thereof |
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Open date: 20100609 |