CN102152058B - Surfacing repair method for large cold-rolled supporting roll - Google Patents
Surfacing repair method for large cold-rolled supporting roll Download PDFInfo
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- CN102152058B CN102152058B CN2011101203264A CN201110120326A CN102152058B CN 102152058 B CN102152058 B CN 102152058B CN 2011101203264 A CN2011101203264 A CN 2011101203264A CN 201110120326 A CN201110120326 A CN 201110120326A CN 102152058 B CN102152058 B CN 102152058B
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Abstract
The invention provides a surfacing repair method for a large cold-rolled supporting roll, comprising the following steps of: turning processing before welding; nondestructive flaw detection; preheating before welding; surfacing of a diluting layer; surfacing of a supporting layer; surfacing of a working layer; distressing heat treatment in the middle of welding; final heat treatment after welding; turning processing of a roll body; nondestructive flaw detection of a finished product; and coating and packaging of the finished product. The surfacing repair method has the effects that the large cold-rolled supporting roll normally scrapped can be repaired for reutilization, so that the production cost of a steel rolling enterprise is greatly reduced; the comprehensive performance and the service life of the repaired large cold-rolled supporting roll are superior to those of the bought integral forged steel large cold-rolled supporting roll; and the surfacing repair method is beneficial to achieving the purposes of repairing the old and utilizing the waste, improving the quality and reducing the consumption, saving the energy and reducing the emission and being green and environmentally-friendly.
Description
Technical field
The invention belongs to metallurgical machinery manufacturing technology field, specifically establishing what relate to is a kind of build-up welding repair method of large-scale cold rolling backing roll.
Background technology
The large-scale cold rolling backing roll is the important expendable rolling tool on the large-scale cold rolling unit, and cold-rolling support roll its diameter in rolled steel may wear to certain size or peels off to lose efficacy because of the roll surface large tracts of land to be scrapped.Large-scale cold rolling steel mill all will consume a large amount of such rolls every year, and its manufacturing process is complicated, and the manufacturing cycle is long, costs an arm and a leg, and every acquisition price is more than 1,000,000 yuan.The quality of roll quality not only directly influences its service life, and quality, production efficiency and the production cost of steel all had very big influence.
The large-scale cold rolling backing roll that adopts overlaying method to repair, its rehabilitation cost has only the 25%-30% that newly purchases the backing roll cost, and can repeat to repair 3-4 time, can improve roll service life simultaneously, and valuable non-ferrous metal is rationally used and practiced thrift to reduction roll consumption amount.Can improve the productivity effect and the product quality of milling train, be a kind of very effective Technological Economy measure.Therefore, large-scale cold rolling strip-mill strip backing roll is carried out the built-up welding reparation, further improve and seem very important and necessary in its performance and service life.
Summary of the invention
The build-up welding repair process method that the purpose of this invention is to provide a kind of large-scale cold rolling backing roll; Be beneficial to reach written-off large-scale cold rolling backing roll is repeated to repair manufacturing again; It is extraordinary that to have solved the large-scale cold rolling backing roll manufacturing cycle long; Service life is short, and combination property is unstable, problems such as acquisition cost height.Upgrading consumption reduction, the target of environmental protection have been realized repairing the old and utilizing scraps.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts provides a kind of build-up welding repair method of large-scale cold rolling backing roll, and this restorative procedure includes following steps: turning processing before the weldering; Nondestructive inspection detects; Weld preheating; The built-up welding diluent zone; The built-up welding supporting course; The built-up welding working lining; Middle destressing heat treatment; The final heat treatment of postwelding; Body of roll turning processing; The finished product nondestructive inspection detects; Finished product oiling packing.
Effect of the present invention is to adopt this method can be with the large-scale cold rolling backing roll repairing and reusing of normal abandonment; Reduce the production cost of Metallurgical Enterprise significantly; Through its combination property of large-scale cold rolling backing roll of repairing and the whole forged steel large-scale cold rolling backing roll that is superior to newly purchasing service life, be beneficial to energy-saving and cost-reducing.
Description of drawings
Fig. 1 is a build-up welding repair method flow chart of the present invention.
The specific embodiment
In conjunction with accompanying drawing the build-up welding repair method of large-scale cold rolling backing roll of the present invention is explained.
The build-up welding repair method of large-scale cold rolling backing roll of the present invention, this restorative procedure includes following steps:
(1), turning processing before the weldering
The roll surface defective of backing roll and fatigue layer are removed, and turning is to the requirement that guarantees overlay cladding thickness, the roll surface local defect adopts turning or abrasive machine detail sanding, guarantees roll surface defective and fatigue layer are all removed, and processes subsequent use roller stock;
(2), nondestructive inspection detects
Roller stock to turning carries out ultrasound examination, and whether the inspection fatigue layer is removed fully and the body of roll is given birth to crack defect in whether existing, if defectiveness still then need continue turning, removes a hidden danger; If ultrasonic inspection goes out roller stock serious internal injury is arranged, then do not continue to carry out again the built-up welding repair of this roller stock;
(3), weld preheating
The main purpose of preheating is to reduce the cooling velocity of deposited metal and heat affected area in the weld deposit process, reduces tendency of hardenability and also reduces welding stress, prevents that roller stock mother metal and resurfacing welding material from taking place to cause the crackle generation because of transformation stress in weld deposit process.Definite need of preheat temperature are according to the carbon content of mother metal and resurfacing welding material and alloy content and decide.
With the roller stock to be welded preheating in the electric furnace that is equipped with band automatic temperature measurement, temperature-controlling system of packing into, programming rate looks room temperature and the roller stock roller directly is 50-80 ℃/h, and the preheating insulation temperature is 320 ℃-350 ℃, and constant temperature begins built-up welding after 10 hours;
(4), bead-welding technology requirement
On large-scale roller automatic submerged-arc surfacing equipment; Carry out the built-up welding of multimachine head monofilament circumferencial direction continuous helical automatic submerged-arc, weld deposit process must guarantee continuous built-up welding, does not allow to stop weldering midway; When stopping welding like fortuitous event; (3) preheat temperature require to heat up and insulation set by step, to guarantee the uniformity of hardness between each overlay cladding, makes welding bead position between each overlay cladding 1/2 weld width that staggers each other during built-up welding;
Before the built-up welding, welding wire that resurfacing welding material is selected for use and adapted sintered flux cure respectively, and to remove moisture content, selecting welding wire for use is the flux-cored wire of Φ 4.0mm, and the sintered flux model is 107 sintered fluxes, technological requirement:
Welding current: 450A
Weldingvoltage: 30V
Speed of welding: 400-500mm/min linear velocity
The welding bead overlap joint: the lap width of adjacent overlay cladding welding bead must guarantee that welding bead is smooth smooth greater than 45%
Electrode extension: 30-35mm
Welding bead interlayer temperature: 300-320 ℃;
(5), built-up welding diluent zone
The built-up welding diluent zone, just bottom its objective is and in the built-up welding mixer of resurfacing welding material and backing roll mother metal, dilutes too high carbon content in the backing roll mother metal, improves the toughness of joint portion, falls end fragility.Diluent zone needs built-up welding two-layer, is not arrived in the working lining of follow-up built-up welding by fused to guarantee carbon content too high in the backing roll mother metal.
Diluent zone hardfacing alloy chemical analysis is by weight percentage:
C 0.15-0.35
Si 0.50-1.20
Mn 1.6-2.2
P ≤0.30
S ≤0.30
Cr 0.80-1.50
Ni 0.70-1.50
Mo 0.40-1.00
All the other are Fe;
(6), built-up welding supporting course
The built-up welding supporting course; Intermediate layer just; The performance that its objective is the metallurgical melting alloy that makes built-up welding working layer and built-up welding diluent zone material further improves, and makes the working lining hardfacing alloy can bear the working environment of big load alternate stress and intermetallic wearing and tearing.
Built-up welding one deck supporting course on diluent zone makes the toughness and the strength matching of diluent zone and working lining joint portion, falls end fragility;
Supporting course hardfacing alloy chemical analysis is by weight percentage:
C 0.30-0.45
Si 0.10-0.40
Mn 1.2-2.0
P ≤0.30
S ≤0.30
Cr 2.40-3.50
Ni 0.60-1.50
Mo 0.40-1.00
All the other are Fe;
(7), built-up welding working lining
To the requirement of unlike materials such as the primitive component 9Cr2Mo of large-scale cold rolling backing roll, 75CrMo and mill milling characteristic, we select Cr-Ni-Mo-V for use is that the good submerged arc overlay welding of wearability, obdurability and anti-contact fatigue property carries out the built-up welding reparation with solder wire material as working lining.Body of roll working lining deposited metal matrix is designed to the good single low-carbon (LC) returning fire plate strip martensitic structure with high strength, high tenacity and high-wearing feature of comprehensive mechanical performance; Avoid producing thick acicular martensitic structure, simultaneously the disperse evenly tiny alloy carbide that distributing on matrix.
Working lining hardfacing alloy chemical analysis is by weight percentage:
C 0.36-0.45
Si 0.10-0.40
Mn 1.50-2.00
P ≤0.30
S ≤0.30
Cr 5.40-6.50
Ni 2.60-3.50
Mo 1.80-2.50
V 0.40-0.90
All the other are Fe;
(8), middle destressing heat treatment
Because the built-up welding thickness of large-scale cold rolling backing roll is bigger; The thickest 50-80mm that reaches; If the one-time continuous built-up welding is accomplished, will make deposited metal produce very large transformation stress and welding stress, the existence of this cumulative stress; With increasing the tendency that the built-up welding backing roll cracks greatly, the backing roll cracking will take place when serious.Therefore when hardfacing alloy thickness reaches 25mm-30mm, must carry out centre destressing heat treatment, to reduce or to eliminate and weld cumulative stress.The destressing heat treatment temperature is controlled at 450-500 ℃, and the time is then confirmed with built-up welding thickness and roller stock diameter.
(9), the final heat treatment of postwelding
The main purpose of post weld heat treatment is for improving the postwelding tissue and eliminating welding stress.The post weld heat treatment of built-up welding reparation backing roll should be carried out in the heat treatment electric furnace of special use, requires the interior temperature homogeneity of stove good, and temperature measuring is accurate, and the temperature control process is accurate.
After the operation of roller stock built-up welding working lining finishes, the backing roll of postwelding is carried out temper in the heat treatment electric furnace, temperature is 480-550 ℃, and programming rate looks room temperature and the roller stock roller directly is 50-80 ℃/h, and is even to guarantee roller stock built-up welding working lining temperature; Temperature retention time 10-15 hour.Cool to the furnace below 50 ℃ and come out of the stove, and in still air, be cooled to room temperature.
(10), body of roll turning processing
To carry out turning processing through the backing roll of step (9) by drawing;
(11), the finished product nondestructive inspection detects
Body of roll overlay cladding to through the backing roll of step (10) processing carries out ultrasound examination, confirms the inner no sand holes of built-up welding, pore, the defective of field trash etc.;
(12), finished product oiling packing.
Claims (1)
1. the build-up welding repair method of a large-scale cold rolling backing roll, this restorative procedure includes following steps:
(1), turning processing before the weldering
The roll surface defective of backing roll and fatigue layer are removed, and with the turning of backing roll barrel diameter to the requirement that guarantees overlay cladding thickness, the roll surface local defect adopts turning or abrasive machine detail sanding, guarantees roll surface defective and fatigue layer are all removed, and processes and welds roller stock fully;
(2), nondestructive inspection detects
Roller stock to turning carries out ultrasound examination, and whether the inspection fatigue layer is thoroughly removed and the body of roll is given birth to crack defect in whether existing, if defectiveness still then need continue turning, removes a hidden danger; If ultrasonic inspection goes out roller stock serious internal injury is arranged, then can not carry out the built-up welding repair of this roller stock;
(3), weld preheating
Preheat temperature preestablishes according to the carbon content and the alloy content of roller stock mother metal and resurfacing welding material; With the roller stock to be welded preheating in the electric furnace that is equipped with band automatic temperature measurement, temperature-controlling system of packing into; Programming rate looks room temperature and the roller stock roller directly is 50-80 ℃/h; The preheating insulation temperature is 320 ℃-350 ℃, and constant temperature began built-up welding after 10 hours;
(4), bead-welding technology requirement
On large-scale roller automatic submerged-arc surfacing equipment; Carry out the built-up welding of multimachine head monofilament circumferencial direction continuous helical automatic submerged-arc, weld deposit process must guarantee continuous built-up welding, does not allow to stop weldering midway; When stopping welding like fortuitous event; (3) preheat temperature require to heat up and insulation set by step, to guarantee the uniformity of hardness between each overlay cladding, makes welding bead position between each overlay cladding 1/2 weld width that staggers each other during built-up welding;
Before the built-up welding, the welding wire of selecting for use and the sintered flux of adapted cure respectively, and to remove moisture content, selecting welding wire for use is the flux-cored wire of Φ 4.0mm, and the sintered flux model is 107 sintered fluxes, technological requirement:
Welding current: 450A
Weldingvoltage: 30V
Speed of welding: 400-500mm/min linear velocity
The welding bead overlap joint: the lap width of adjacent overlay cladding welding bead must guarantee that welding bead is smooth smooth greater than 45%
Electrode extension: 30-35mm
Welding bead interlayer temperature: 300-320 ℃;
(5), built-up welding diluent zone
The two-layer diluent zone of built-up welding on roller stock is not arrived in the working lining of follow-up built-up welding by fused to guarantee carbon content too high in the roller stock mother metal earlier;
Diluent zone hardfacing alloy chemical analysis is by weight percentage:
All the other are Fe;
(6), built-up welding supporting course
Built-up welding one deck supporting course on diluent zone makes the toughness and the strength matching of diluent zone and working lining joint portion, reduces fragility;
Supporting course hardfacing alloy chemical analysis is by weight percentage:
All the other are Fe;
(7), built-up welding working lining
Continuous built-up welding working lining on supporting course is to satisfy the needs of backing roll barrel diameter and serviceability;
Working lining hardfacing alloy chemical analysis is by weight percentage:
All the other are Fe;
(8), middle destressing heat treatment
In the process of built-up welding working lining; Must carry out centre destressing heat treatment; To reduce or to eliminate the welding cumulative stress, behind every built-up welding working lining 25-35mm, carry out once middle destressing heat treatment; The destressing heat treatment temperature is controlled at 450-500 ℃, and the time is then confirmed with built-up welding thickness and roller stock diameter;
(9), the final heat treatment of postwelding
After the operation of roller stock built-up welding working lining finishes, backing roll is carried out temper in the heat treatment electric furnace, temperature is 480-550 ℃, and programming rate looks room temperature and the roller stock roller directly is 50-80 ℃/h, guarantees that roller stock built-up welding working lining temperature is even; Temperature retention time 10-15 hour.Cool to the furnace below 50 ℃ and come out of the stove, and in still air, be cooled to room temperature;
(10), body of roll turning processing
To carry out turning processing through the backing roll of step (9) by drawing;
(11), the finished product nondestructive inspection detects
Body of roll overlay cladding to through the backing roll of step (10) processing carries out ultrasound examination, confirms the inner no sand holes of built-up welding, pore, the defective of field trash;
(12), finished product oiling packing.
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| CN2011101203264A CN102152058B (en) | 2011-05-11 | 2011-05-11 | Surfacing repair method for large cold-rolled supporting roll |
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| CN2011101203264A CN102152058B (en) | 2011-05-11 | 2011-05-11 | Surfacing repair method for large cold-rolled supporting roll |
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| CN102152058B true CN102152058B (en) | 2012-08-08 |
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| CN101804494A (en) * | 2010-03-31 | 2010-08-18 | 哈尔滨汽轮机厂有限责任公司 | Overlaying process for high-medium pressure rotor thrust disk made of ultra supercritical 12% Cr steel |
| CN101837501A (en) * | 2010-05-20 | 2010-09-22 | 哈尔滨汽轮机厂有限责任公司 | Surfacing method of 12-percent Cr steel high and middle pressure rotor journal of ultra supercritical steam turbine |
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| CN102152058A (en) | 2011-08-17 |
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