CN102189316B - Submerged-arc welding overlaying repairing method for stainless steel hot rolled delivery roll - Google Patents
Submerged-arc welding overlaying repairing method for stainless steel hot rolled delivery roll Download PDFInfo
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- CN102189316B CN102189316B CN 201010122513 CN201010122513A CN102189316B CN 102189316 B CN102189316 B CN 102189316B CN 201010122513 CN201010122513 CN 201010122513 CN 201010122513 A CN201010122513 A CN 201010122513A CN 102189316 B CN102189316 B CN 102189316B
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Abstract
The invention discloses a submerged-arc welding overlaying repairing method for a stainless steel hot rolled delivery roll. The method comprises the following steps of: 1) performing pre-welding treatment, namely performing pre-welding preheating on the roll, wherein the preheating temperature is controlled to be 250 to 300 DEG C and the heat preservation time is more than or equal to 3.5 hours; 2) performing submerged arc overlaying, namely a, performing overlaying on a base coat, wherein the welding current is controlled to be 300 to 350A, the welding voltage is 27 to 28V, the welding speed is controlled to be 500mm/min, the thread pitch is 10 to 11mm, the overlaying thickness is controlled to be single-side 1 to 1.5mm/layer, and the interlayer welding temperature is controlled to be 300 to 350 DEG C; b, performing overlaying on a working layer, wherein the welding current is controlled to be 330 to 380A, the welding voltage is 28 to 32V, the welding speed is controlled to be 500 to 650mm/min, the thread pitch is 12 to 13mm, the overlaying thickness is controlled to be single-side 2 to 2.5mm/layer, and the interlayer welding temperature is controlled to be 300 to 350 DEG C; and (3) performing post welding treatment, namely performing stress-relief heat treatment on the hot-rolled roll which is subjected to overlaying, wherein the temper temperature is controlled to be 550 to 580 DEG C and the preservation time is more than or equal to 6 hours. The overlaying layer has high anti-strip performance, wear resistance, and fatigue resistance.
Description
Technical field
The present invention relates to welding technology field, particularly stainless steel hot-rolling conveying roller submerged arc bead welding restorative procedure.
Background technology
In hot rolling was produced, the various rollers on the rolling line directly contacted with rolling metal, just produced attrition under the effect of mutual stress, until scrapping.Therefore, how to improve the service life of rolling line upper roller, pair of rollers is repaired the old and utilized scraps, and becomes an important channel that reduces product cost.
After the roller overlaying welding reparation refers to remove the fatigue layer or defective of roller surfaces, with suitable resurfacing welding material, the technological process of adopting science and technological parameter it is repaired to the process in original roller footpath.Its major advantage is that the roller footpath before and after roller uses is constant.Therefore this technology is for hot rolling reduces all kinds of roller consumption in producing, improving that roller provides service life may.
The technique for overlaying of metallurgy industry use at home and abroad has spraying plating, gas shielded arc welding, submerged-arc welding, electroslag welding at present; wherein adopting submerged arc bead welding to repair all kinds of hot rolls is most widely used technology, has that production efficiency height, quality are good, the advantage of better economic benefit.
The welding wire that the hot roll of metallurgy industry submerged arc overlay welding reparation both at home and abroad adopts is generally alloy welding wires such as 2Cr13,3Cr13,30CrMnSiA, 3Cr2W8V, 3CrMoSi, 3Cr2W4Mn.In weld deposit process, when the parent metal phase transformation critical-temperature of surfacing layer metal and roller has the bigger temperature difference, will produce bigger stress, when hot state or cooling, if stress sum total is during greater than the immanent structure power of surfacing layer metal, phenomenons such as surfacing layer metal will crack, comes off, steel bonding.
Summary of the invention
At some practical problems that run in the built-up welding reparation, as: crackle occurs, come off, phenomenon such as steel bonding, the purpose of this invention is to provide a kind of stainless steel hot-rolling conveying roller submerged arc bead welding restorative procedure, overlay cladding should satisfy the requirement of specific chemical composition, should have suitable metallographic structure (comprising matrix and carbide); Overlay cladding will have higher antistrip performance, advantages of good abrasion performance and anti-fatigue performance; Good processability; Continuously in the submerged arc overlay welding operation, the wlding processing performance is good, and welding slag has the good removability of slag (refer to not dry slag, take off slag automatically); Has higher (built-up welding) production efficiency, repeatedly built-up welding reparation after requiring simultaneously to use; Overlay cladding hardness and the uniformity of hardness specification requirement of satisfying roller-way after heat treatment; Roller-way after built-up welding is repaired, it uses on the machine the life-span and must not be lower than former roller.
For achieving the above object, technical scheme of the present invention is,
Stainless steel hot-rolling conveying roller submerged arc bead welding restorative procedure, it comprises the steps:
1) pre-welding treatment, pair of rollers is carried out weld preheating, and preheat temperature is controlled at 250～300 ℃,
Temperature retention time 〉=3.5h;
2) submerged arc overlay welding technology
A. prime coat built-up welding:
Welding current control is controlled at 300～350 ℃ in monolateral 1～1.5mm/ layer, interlayer welding temperature in 500mm/min, pitch: 10～11mm, built-up welding THICKNESS CONTROL in 300～350A, weldingvoltage 27～28V, speed of welding control;
B. working lining built-up welding:
Welding current control is controlled at 300～350 ℃ in monolateral 2～2.5mm/ layer, interlayer welding temperature in 500～650mm/min, pitch: 12～13mm, built-up welding THICKNESS CONTROL in 330～380A, weldingvoltage 28～32V, speed of welding control;
3) after welding treatment
The hot roll that built-up welding is good is done the heat treatment that eliminates stress, and temperature is controlled at 550～580 ℃, temperature retention time 〉=6h.
Further, solder wire material SW-510A is selected in the prime coat built-up welding for use, flux material HJ-431, and gage of wire: φ 4mm, dry by the fire 1～1.5h at 150～200 ℃ before the welding wire solder flux uses.
Further, solder wire material SW-524HL is selected in the working lining built-up welding for use, flux material HJ-107, and gage of wire: φ 4mm, dry by the fire 1～1.5h at 150～200 ℃ before the welding wire solder flux uses.
The present invention's difference or characteristics compared with prior art:
1. overlay cladding satisfies the requirement of specific chemical composition
The material of rollgang roller is SF55.Its phosphorus content is very high, and microscopic structure is cementite and ferritic line and staff control basically.Its thermal conductivity factor is very low, easily produces bigger thermal stress and structural stress in the weld deposit process, during built-up welding preheat temperature control bad, be easy to produce overlay cladding and peel off.
According to the failure cause of hot rolling conveying roller, the alloy system of resurfacing welding material should possess martensite transformation temperature, high strength, higher hardness and high temperature oxidation resistance etc.Molybdenum is the strong carbide forming element, and the carbide fusing point height of formation has higher anti-temper softening ability.Higher chromium content improves high temperature oxidation resistance greatly, the thermal fatigue resistance crackle is formed and the extended capability enhancing, improves thermal fatigue strength.Under the higher temperature, chromium, the martensitic decomposition of the strong postponement of molybdenum alloy element, thus improve resistance to tempering.If as-welded acquisition down is the lath martensite tissue, after the postwelding destressing is handled, the carbide particle of easier disperse distribution high rigidity on the very high lath martensite matrix of intensity, this second martensite of strengthening mutually has higher wearability and heat endurance than single martensitic structure.Body of roll be full of cracks is due to face crack is expanded, and is to reduce be full of cracks, and deposited metal must possess enough toughness.So roller-way surface overlaying metal should can disperse be separated out alloy carbide for containing the alloy of chromium, molybdenum and nickel etc. when tempering, material property is further improved.
2. technological parameter has guaranteed that overlay cladding has enough thickness, reduces postwelding allowance
The present invention is when being improved welding efficiency and deposition rate, reduced dilution rate, and reduced postwelding roll surface ratio of defects, postwelding roll surface flatness is greatly improved, allowance is by 6 original～7mm, drop to 4 present～5mm, when greatly reducing the welding wire consumption, reduce postwelding metalworking workload.This cover parameter has also realized the purpose of multiple-bead deposit in addition, has guaranteed that except prime coat working lining is at least more than 4 layers, and the THICKNESS CONTROL of working lining has effectively guaranteed the service life of roller-way more than monolateral 8mm.
3. realized that in continuous submerged arc overlay welding operation welding slag has the good removability of slag (refer to not dry slag, take off slag automatically);
The flux material HJ-107 that working lining adopts has the good removability of slag, can realize taking off automatically slag at the one or two layer, and welding performance is good, has significantly reduced working strength of workers.
4. has higher (built-up welding) production efficiency, repeatedly built-up welding reparation after using simultaneously;
Restorative procedure of the present invention can be realized repeatedly built-up welding reparation, and only need car to go fatigue layer when repairing next time, need not built-up welding prime coat again, direct built-up welding working lining, and economic benefit is more considerable.
5. overlay cladding hardness and the uniformity of hardness specification requirement of satisfying roller-way after heat treatment;
6. overlay cladding has good processability;
About HRC40, general metalworking all can realize the smooth processing to it to overlay cladding in the hardness after the heat treatment, we can say that it possesses good machining property.
7. the roller-way after built-up welding is repaired, it uses on the machine the life-span and is not less than former roller;
Adopt conveying roller hardness, red hardness, heat-resistant anti-fatigue performance and the anti-wear performance of new resurfacing welding material reparation to have and increase substantially, working lining hardness is even, steady quality.In use, roller-way surface flawless and crack performance have surpassed a year and a half service time; life-span reaches 1.5～2 times of new roller; and its rehabilitation expense has only 30～35% of new roller, has reduced the shutdown repairing time of unit simultaneously, has obtained the better economic effect.
8. the hot rolling conveying roller after the built-up welding has good crack resistance, wearability, cold-resistant thermal fatigue, flawless, come off, phenomenon such as steel bonding.
The built-up welding material of existing conveying roller roll surface layer belongs to the high carbon martensite stainless steel, contains the Cr amount up to reaching 13%, and its advantage is good heat resistance, i.e. resistance to high temperature oxidation (stainless), and calorific intensity, hardness are all high.Shortcoming is that Cr is also big with the affinity of contacting metal down in uniform temperature (more than 500 ℃).Especially rolling stainless steel when steel plate fiercely impacts conveying roller, produces immense pressure, makes the contact point of steel plate and conveying roller produce TRANSIENT HIGH TEMPERATURE, and steel billet temperature is high again in addition, has encouraged affinity between the two greatly.Under the synergy of high temperature and high pressure, the local severe plastic deformation that takes place of steel plate, and with conveying roller surface cementation (adhesion) or seam.During the roller rotation, the contact point of steel plate and conveying roller is under the shearing stress effect, and the steel material that intensity is lower is torn, and sticks to the conveying roller surface, has formed so-called " steel bonding ".Along with the increase of time, this buildup is more long-pending more big.In the process of conveying roller transmission steel plate, buildup makes surface of steel plate produce impression.And during rolling straight carbon steel, because the thrust between steel plate and the conveying roller is less, temperature is lower again in addition, just is difficult for producing steel bonding.
Analysis and research show: it is more high to contain the Cr amount in the conveying roller roll surface material, and the steel bonding possibility is more big; The surface of steel plate temperature is more high, the more easy steel bonding of roll surface.Obviously, steel billet temperature is to be determined by the kind of steel and specification, can't change.Solve chemical composition or performance that the steel bonding problem can only change the conveying roller roll surface.For this reason, must redesign conveying roller roll surface resurfacing welding material, develop new conveying roller bead-welding technology simultaneously.Reduction contains the Cr amount significantly in new resurfacing welding material, in order to ensure its heat resistance, adds a certain amount of other alloying elements.In addition, suitably improve C content, can improve conveying roller roll surface hardness and can fix a part of Cr again, generate Cr
7C
3, with the affinity of further weakening Cr.
Resurfacing welding material in the restorative procedure of the present invention and bead-welding technology are when guaranteeing good crack resistance, wearability, cold-resistant thermal fatigue, solved conveying roller steel bonding problem effectively, prolonged the service life of conveying roller, improve the surface quality of hot rolled steel plate, obtained the better economic effect.
Description of drawings
Fig. 1 is the photo (200 *) of embodiment of the invention surface overlaying layer microscopic structure;
Fig. 2 is the photo (500 *) of embodiment of the invention surface overlaying layer microscopic structure.
The specific embodiment
The selected dc source with decline power supply characteristic that uses of the present invention carries out filament circumferencial direction continuous helical submerged arc overlay welding at numerical control roll swinging arc overlaying welding machine tool complete set of equipments (MUB-2-1250-NC).
The resurfacing welding material of selecting for use is: welding wire SW-524L, supporting solder flux HJ-107, diameter phi 4mm, its concrete composition (%) is: C 0.08%, Si 0.50%, Mn 1.15%, Cr 13.50%, Ni 1.50%, Mo 1.15%, S≤0.03%, P≤0.03%.
The flux material HJ-107 that working lining adopts has the good removability of slag, can realize taking off automatically slag at the one or two layer, and welding performance is good.
1, pre-welding treatment
Pair of rollers is carried out weld preheating, and preheat temperature is controlled at 250～300 ℃, and temperature retention time is: φ 450 rollers 〉=4.5h, φ 400 rollers 〉=4h, φ 350 rollers 〉=3.5h
Welding material
Prime coat is selected solder wire material SW-510A for use, flux material HJ-431, gage of wire: φ 4mm, dry by the fire 1h at 150～200 ℃ before the welding wire solder flux uses.
Working lining is selected solder wire material SW-524HL for use, flux material HJ-107, gage of wire: dry by the fire 1h at 150～200 ℃ before φ 4mm, welding wire solder flux use.
Above-mentioned welding wire, flux material are standard brand.
2, submerged arc overlay welding technology
Take out the good roller of preheating and carry out the prime coat built-up welding: welding current control is controlled in 500mm.min-1, pitch: 10～11mm, built-up welding THICKNESS CONTROL at monolateral 1～1.5mm/ layer in 27～28V speed of welding in 300～350A, weldingvoltage control; The control of interlayer welding temperature is at 300～350 ℃.
Adopt contact temperature-measuring instrumentation amount interlayer temperature, to reach the order of strict control temperature.If temperature surpasses 350 ℃, then must stop weldering, adopt air cooling to guarantee interlayer temperature.
The working lining built-up welding: welding current control is controlled at 300～350 ℃ in monolateral 2～2.5mm/ layer, interlayer welding temperature in 500～650mm/min, pitch: 12～13mm, built-up welding THICKNESS CONTROL in 28～32V, the control of solder flux speed in 330～380A, weldingvoltage control.
Adopt contact temperature-measuring instrumentation amount interlayer temperature, to reach the order of strict control temperature.If temperature surpasses 350 ℃, then must stop weldering, adopt air cooling to guarantee interlayer temperature.
Dimensional requirement control exists after the built-up welding: φ 350 rollers: 〉=φ 355mm; φ 400 rollers: 〉=φ 405mm; φ 450 rollers: 〉=φ 455mm;
The built-up welding order: welding gun begins built-up welding from the roller end face, the same direction built-up welding of every course, following one deck change of direction.When putting arc and stop, the arc crater that needs to put the arc place with sander is worn into groove type, begins welding then in the built-up welding.
3, after welding treatment
The hot roll that built-up welding is good is done the heat treatment that eliminates stress, and temperature is controlled at 550～580 ℃, temperature retention time 〉=6h.
Referring to Fig. 1, Fig. 2, the metallographic structure that overlay cladding has.
Be martensite from surface overlaying layer microscopic structure table of discovery surface build-up welding layer tissue, guaranteed structural requirement.
Test specimen is processed into the sample of 20mm * 15mm * 10mm, sample is carried out 580 ℃ of temper, the hardness that records bead weld specimen sees Table 1.
The hardness of table 1 bead weld specimen (HRC)
| Test point | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Sample one | 42 | 39 | 38 | 41 | 42.5 | 37.2 | 39 | 36.5 | 36 | 38.8 |
| Sample two | 39 | 39.5 | 41 | 42.5 | 40 | 38.4 | 39.8 | 41.6 | 37.9 | 40.8 |
From the result of hardness test as can be seen, the hardness of overlay cladding is distributed in about HRC40, satisfies the instructions for use of hot rolling conveying roller fully.
Claims (1)
1. stainless steel hot-rolling conveying roller submerged arc bead welding restorative procedure, it comprises the steps:
1) pre-welding treatment, pair of rollers is carried out weld preheating, and preheat temperature is controlled at 250～300 ℃, temperature retention time 〉=3.5h;
2) submerged arc overlay welding technology
A. prime coat built-up welding:
Welding current control is controlled at 300～350 ℃ in monolateral 1.5～2mm/ layer, interlayer welding temperature in 500mm/min, pitch: 10～11mm, built-up welding THICKNESS CONTROL in 300～350A, weldingvoltage 26～37V, speed of welding control; Solder wire material SW-510A is selected in the prime coat built-up welding for use, flux material HJ-431, gage of wire: φ 4mm, dry by the fire 1～1.5h at 150～200 ℃ before the welding wire solder flux uses;
B. working lining built-up welding:
Welding current control is controlled at 300～350 ℃ in monolateral 2～2.5mm/ layer, interlayer welding temperature in 500～650mm/min, pitch: 12～13mm, built-up welding THICKNESS CONTROL in 330～380A, weldingvoltage 28～32V, speed of welding control; Solder wire material SW-524HL is selected in the working lining built-up welding for use, flux material HJ-107, and gage of wire: φ 4mm, dry by the fire 1～1.5h at 150～200 ℃ before the welding wire solder flux uses; Working lining has 4 layers at least, guarantees that the thickness of working lining is at monolateral 〉=8mm;
3) after welding treatment
The hot roll that built-up welding is good is done the heat treatment that eliminates stress, and temperature is controlled at 550～580 ℃, temperature retention time 〉=6h.
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