CN101994114A - Laser cladding wear-resisting and heat fatigue-resisting alloy coating process for manufacturing hot rolled seamless steel tube rolling mill retained mandrel - Google Patents
Laser cladding wear-resisting and heat fatigue-resisting alloy coating process for manufacturing hot rolled seamless steel tube rolling mill retained mandrel Download PDFInfo
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- CN101994114A CN101994114A CN2009100133286A CN200910013328A CN101994114A CN 101994114 A CN101994114 A CN 101994114A CN 2009100133286 A CN2009100133286 A CN 2009100133286A CN 200910013328 A CN200910013328 A CN 200910013328A CN 101994114 A CN101994114 A CN 101994114A
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Abstract
The invention discloses a laser cladding wear-resisting and heat fatigue-resisting alloy coating method for manufacturing a hot rolled seamless steel tube rolling mill retained mandrel, which is characterized by comprising the following steps: carrying out surface cleaning on greasy dirt and rustyscale of a retained mandrel; selecting cobalt-base alloy powder; adopting laser equipment and an automatic powder delivering device; carrying out laser cladding processing on the surface of the retained mandrel so as to form a 0.2-2mm coating with high-temperature oxidation resistance, heat fatigue resistance and heat abrasion resistance; and carrying out high temperature tempering processing on the retained mandrel after being subject to the laser cladding processing so as to decrease the coating after being subject to the laser cladding processing and the residual stress after the gene matrix is transformed. The laser cladding alloy coating of the invention is even and compact, has the characteristics of high production efficiency, low energy consumption, small machining allowance of a cladding layer, high yield and low comprehensive cost and the like.
Description
Technical field
The present invention relates to a kind of wear-resisting erosion resistance method of metallurgical equipment parts, particularly relate to a kind ofly adopt the preparation hot rolled seamless steel tube milling train retained mandrel of laser melting and coating technique wear-resisting, the technology of thermal fatigue resistance alloy coat, belong to C23C24/10 (2006.01) the I technical field in the IPC International Patent Classification (IPC).
Background technology
The fastest development had since the dawn of human civilization appearred in China's weldless steel tube industry in recent years, and as tool and mould-plug important in the tube rolling unit, its demand also increases substantially thereupon.The expert thinks: the Eleventh Five-Year Plan period building and the operation successively of new production line along with domestic, the domestic consumption of estimating China's plug in 2010 is about 1.5～2.0 ten thousand tons.
In the productive expense of weldless steel tube, the consumption of rolling tool and mould-plug reaches 50-100 unit/ton.China's hot rolled seamless steel tube output in 2008 is more than 2,000 ten thousand tons according to statistics, and plug consumption reaches hundred million yuan of 10-20, and heavy caliber seamless steel pipe retained mandrel 80% needs import, and therefore steel pipe enterprise pays high acquisition expenses.Thereby the work-ing life, the consumption of reduction instrument that improve plug are the technical barriers that weldless steel tube enterprise presses for solution.
Retained mandrel rapid heat cycle repeatedly in the operation of rolling bears huge pulsating stress, and therefore its surface forms heat fatigue cracking and thermal wear and lost efficacy.The main path that improves at present retained mandrel work-ing life is to adopt heavy alloyed hot-work die steel and ultra-clean steel smelting technology to improve wear-resisting, the thermal fatigue resistance of retained mandrel.Obviously the whole purity that improves steel can bring the increasing of manufacture difficulty and the significantly rising of cost, inefficacy that the more important thing is plug is because of the former of surface crack and thermal wear thereby causes whole scrapping, can cause social cost and huge waste rare, precious resource virtually.It also is one of technology that adopts at present that retained mandrel plates surperficial hard chrome, but anchoring strength of coating is poor, easily peels off and not environmental protection, belongs to the technology that country's restriction is adopted.
Therefore, select that suitable preparation hot rolled seamless steel tube milling train retained mandrel is wear-resisting, the technology of thermal fatigue resistance alloy coat, make that hot rolled seamless steel tube milling train retained mandrel is wear-resisting, thermal fatigue resistance alloy coat and substrate combinating strength height, wear-resisting and thermal fatigue resistance good, the thickness of alloy coat is even, be the current problem that needs to be resolved hurrily.
Laser melting and coating technique has obtained rapid popularization and widespread use in recent years as a kind of advanced person's re-manufacturing technology.
Laser melting and coating technique utilizes the high characteristics of high energy laser beam focused energy, moment will be preset or send the powdered alloy of putting, have specific physical, chemistry or mechanical property to melt fully synchronously automatically with laser at substrate surface, base material part fusing simultaneously, form a kind of new composite shape matl, rapid solidification after the laser beam flying, the fine and close coating of acquisition and matrix metallurgical binding is to reach the purpose of recovering geometrical dimension and surface strengthening.
At present, about utilizing laser melting and coating process to prepare the patent of equipment unit wear-resisting erosion resistance alloy coat and reporting a lot: for example,
Publication number is " laser smelting coating after metal surface plasma spray prepares the method for ceramic coating " that the Chinese invention patent application of CN1202534 provides, this method is to prepare ceramic coating in the metallic surface with plasma spraying method earlier, then in laser radiation, ceramic powder is sprayed to coatingsurface, ceramic coating is carried out the secondary cladding handle.
Publication number is " preparation method of laser fusion covered nickel base nanometer WC/Co precoated layer " that the Chinese invention patent application of CN1786272 provides, 1. this preparation method comprise the following steps: by the shellac of every grammes per square metre and the dehydrated alcohol weighing shellac and the dehydrated alcohol of 10～20 grammes per square metres, then will described shellac adds in the dehydrated alcohol to make binding agent; 2. as required in the ratio of the binding agent of every gram nickel base nanometer WC/Co powder and 0.1 milliliter～0.25 milliliter, weighing nickel base nanometer WC/Co powder and described binding agent also mix, and stir and make pre-gluing; 3. above-mentioned pre-gluing is coated in the workpiece surface for the treatment of Laser Cladding Treatment equably, makes precoated layer; 4. oven dry.Adopt homemade adhesive preparation nickel base nanometer WC/Co precoated layer, and then adopt laser melting and coating process, prepared that the surface is more smooth, finer and closely woven, basically eliminate crackle and hole and be the nickel base nanometer WC/Co compound coating of metallurgical binding with matrix.
Publication number is " laser melting and coating process of hydraulic support column cylinder, piston rod wear-resisting erosion resistance coating " that the Chinese invention patent application of CN101338427 provides, comprise following technological process: at first column cylinder, piston rod surface pre-treatment: column cylinder barrel, piston rod surface carry out oil removing, rust cleaning under the room temperature, and clean with alcohol wash; The adjusting of the selection of powdered alloy and automatic powder feeding device then: select for use have good wear-resisting erosion resistance performance and with the good iron(-)base powder of the metallurgical consistency of matrix, mainly contain Fe, C, Cr, Ni, Mo, Si, N, Nb, Ta, B in the composition of iron(-)base powder; The adjusting of last automatic powder feeding device: regulate the automatic powder feeding device, the powdered alloy that the automatic powder feeding head is come out just in time drops in the laser molten pool, regulates powder sending quantity, makes the thickness of alloy powder coating reach 0.6-1.2mm.
Publication number is " the railroad switch sliding bed surface abrasion resistance non-corrosive alloy coating laser melting and coating process " that the Chinese invention patent application of CN101338425 provides, comprise following technological process: at first slide plate surface preparation, promptly at room temperature degreasing and rust removal is carried out on the slide plate surface, and clean with alcohol wash; Be presetting of powdered alloy then, promptly the iron-based for the treatment of cladding, Ni-based or Co-based alloy powder are preset in slide plate surface after the above-mentioned processing, and adjust prealloyed powder with the floating rule that has guide rail, make it to be evenly distributed on slide plate surface and have suitable thickness, to satisfy the requirement of coat-thickness after the cladding; Be that slide plate is strengthened in the light cladding at last, select gas CO for use
2Laser apparatus, worktable are numerically-controlled machine, carry out laser melting coating on the slide plate surface and strengthen.
Publication number is " the pick-like bit denticle head laser fusing and coating wear-resistant coating reinforcing process " that the Chinese invention patent application of CN101338428 provides, and comprises following technological process: at first be the pre-treatment of pick denticle head surface; Be the selection of powdered alloy and the adjustment of automatic powder feeding device then; Be pick head laser melting coating coated with wear-resisting alloy at last.
Though the technique scheme that prior art provides can be utilized laser melting and coating process that the equipment component parts are carried out antiseptic wearable coat and handle, and, obtain certain technique effect by preparing the problem that suitable cladding material has overcome crackle, pore and the microtexture ununiformity of the existence of laser crucible zone.But to other specific equipment unit, the special construction as hot rolled seamless steel tube milling train retained mandrel for example, existing laser melting and coating process obviously can not adapt to.
Retrieve verification through the applicant: adopt laser melting and coating process to finish wear-resisting, the thermal fatigue resistance alloy coat of hot rolled seamless steel tube milling train retained mandrel, domestic beyond example is not still seen relevant report abroad yet.Therefore, seek out suitable employing laser melting coating and finish that hot rolled seamless steel tube milling train retained mandrel is wear-resisting, the processing method of thermal fatigue resistance alloy coat, still need the those skilled in the art further to make creationary research work.
Summary of the invention
The objective of the invention is to problem wear-resisting at prior art, that the thermal fatigue resistance alloy coat is handled difficulty to hot rolled seamless steel tube milling train retained mandrel, by research improvement repeatedly, provided a kind of new wear-resisting, thermal fatigue resistance alloy coating technique of hot rolled seamless steel tube milling train retained mandrel laser melting coating.This laser melting and coating process adopts high power laser light equipment and synchronous automatic powder feeding device, when high-power laser beam irradiation retained mandrel surface forms laser molten pool, the Co-based alloy powder material of excellent performance is sent into the molten bath synchronously, laser beam is removed the coating that back molten bath rapid solidification forms resistance to high temperature oxidation about 0.2--2mm, thermal fatigue resistance, heat resistanceheat resistant wearing and tearing, thereby improves 1 times of plug work-ing life or more than the several times.
The technical scheme that the present invention provides is: wear-resisting, the thermal fatigue resistance alloy coating technique of this hot rolled seamless steel tube milling train retained mandrel laser melting coating, adopt laser equipment and automatic powder feeding device, when laser beam irradiation retained mandrel surface forms laser molten pool, alloy powder material is sent into the molten bath, the coating of the resistance to high temperature oxidation of molten bath rapid solidification formation 0.2--2mm, thermal fatigue resistance, heat resistanceheat resistant wearing and tearing after laser beam is removed is characterized in including following steps:
1, working lining mechanical workout and surface-conditioning
In order to reserve the required working lining thickness of laser melting coating, remove the retained mandrel greasy dirt with solvent or clean-out system, to retained mandrel rusty scale polishing or blast cleaning;
2, laser melting coating processing
1) adjustment of the selection of powdered alloy and automatic powder feeding device
According to the retained mandrel operating mode, adopt Co-based alloy powder, its Chemical Composition is by weight percentage: C:0.2-0.3%, Cr:25-30%, Ni:2-4%, Mo:4.5-6.5%, Si:0.7-1.5%, surplus are Co.Regulate automatic powder feeding device powder feeding rate, to satisfy the required powder feeding rate of coat-thickness, powder feeding rate is 5-20g/min;
2) circular light beam laser cladding technological parameter
Condensing lens f=300～400mm
Cladding power P=3000～10000W
Spot diameter D=2～6mm
Cladding scan velocity V=200～1000mm/min
Overlapping rate 40～60%
The rectangular light beam laser melting coating
Cladding power P=3000～10000W
Rectangular light spot length * wide=(8～10) mm * (1～2) mm
Cladding scan velocity V=100～800mm/min
Overlapping rate 40～60%;
3, subsequent heat treatment
In heat treatment furnace the retained mandrel behind the laser melting coating being carried out high tempering handles: temperature is 550-600 ℃, and stress relief annealing 5～7 hours is with the unrelieved stress after coating and matrix change behind the minimizing laser melting coating.
The present invention selects for use Co-based alloy powder to have good high temperature oxidation resistance, thermal fatigue resistance and heat resistanceheat resistant abradability; The alloy thermal expansivity is molten very close with matrix, can suppress like this in the laser cladding process owing to the difference between base material and the hot rerum natura of cladding material causes the structural stress that produces.
Principle of the present invention is: by adopting the fabulous Co-based alloy powder of high-temperature behavior, utilize laser melting coating advanced person's process means, coating in the resistance to high temperature oxidation about formation 0.2-2mm, thermal fatigue, heat resistanceheat resistant wearing and tearing on the matrix, thereby improve plug work-ing life, realize high performance-price ratio the laser plug manufacturing and making.
Compared with prior art, the invention has the beneficial effects as follows:
1, laser cladding Co-based alloy coating is even, fine and close, forms firm metallurgical binding with matrix.
2, adopt structural alloy steel (35CrMoV, 40CrNiMo etc.) recombination laser cladding Co-based alloy can replace the ultrapure steel technology for making and the expensive hot-work die steel materials such as H11, H13 of traditional retained mandrel, realize the laser manufacturing of retained mandrel.
3, the technology of the present invention has environmentally safe, radiationless, lower noise, also has the productivity height, characteristics such as energy consumption is low, cladding layer process redundancy is little, yield rate is high and comprehensive cost is low.
4, the present invention can be used for the reparation of retained mandrel and makes.
Embodiment
Case study on implementation 1:
Hot rolled seamless steel tube milling train retained mandrel laser melting coating manufacturing processed:
1, working lining mechanical workout and surface-conditioning
The purpose of mechanical workout is in order to reserve the required working lining thickness of laser melting coating, and surface-conditioning is the important procedure that guarantees coating and substrate combinating strength, and retained mandrel greasy dirt etc. are removed with solvent or clean-out system, can be with polishing or blast cleaning to the retained mandrel rusty scale.
2, laser melting coating processing
1) adjustment of the selection of powdered alloy and automatic powder feeding device
According to the retained mandrel operating mode, select Co-based alloy powder for use, the Chemical Composition of Co-based alloy powder is by weight percentage: C:0.2-0.3%, Cr:25-30%, Ni:2-4%, Mo:4.5-6.5%, Si:0.7-1.5%, surplus are Co.
Regulate automatic powder feeding device powder feeding rate, to satisfy the required powder feeding rate of coat-thickness.
2) laser cladding technological parameter
Condensing lens f=400
Cladding power P=4000W
Spot diameter D=4mm
Cladding scan velocity V=500mm/min
Overlapping rate 50%
3, subsequent heat treatment
In heat treatment furnace the retained mandrel behind the laser melting coating being carried out high tempering handles: temperature is 580 ℃, and stress relief annealing 6 hours is with the unrelieved stress after coating and matrix change behind the minimizing laser melting coating.
Embodiment 2
Hot rolled seamless steel tube milling train retained mandrel laser melting coating manufacturing processed of the present invention:
1, working lining mechanical workout and surface-conditioning
The purpose of mechanical workout is in order to reserve the required working lining thickness of laser melting coating, surface-conditioning is the important procedure that guarantees coating and substrate combinating strength, the greasy dirts of retained mandrel etc. are removed with solvent or clean-out system, can be with polishing or blast cleaning to the rusty scale of retained mandrel.
2, laser melting coating processing
1) adjustment of the selection of powdered alloy and automatic powder feeding device
According to the retained mandrel operating mode, select Co-based alloy powder for use, the Chemical Composition of Co-based alloy powder is by weight percentage: C:0.2-0.3%, Cr:25-30%, Ni:2-4%, Mo:4.5-6.5%, Si:0.7-1.5%, surplus are Co.
Regulate automatic powder feeding device powder feeding rate, to satisfy the required powder feeding rate of coat-thickness.
2) laser cladding technological parameter
Cladding power P=7000W
Rectangular light spot length * wide=10mm * 1mm
Cladding scan velocity V=400mm/min
Overlapping rate 40%
3, subsequent heat treatment
In heat treatment furnace the retained mandrel behind the laser melting coating being carried out high tempering handles: temperature is 600 ℃, and stress relief annealing 7 hours is with the unrelieved stress after coating and matrix change behind the minimizing laser melting coating.
Claims (1)
1. wear-resisting, thermal fatigue resistance alloy coating technique of hot rolled seamless steel tube milling train retained mandrel laser melting coating, adopt laser equipment and automatic powder feeding device, when laser beam irradiation retained mandrel surface forms laser molten pool, alloy powder material is sent into the molten bath, the coating of the resistance to high temperature oxidation of molten bath rapid solidification formation 0.2--2mm, thermal fatigue resistance, heat resistanceheat resistant wearing and tearing after laser beam is removed is characterized in that including following steps:
(1) working lining mechanical workout and surface-conditioning
In order to reserve the required working lining thickness of laser melting coating, remove the retained mandrel greasy dirt with solvent or clean-out system, to retained mandrel rusty scale polishing or blast cleaning;
(2) laser melting coating processing
1) adjustment of the selection of powdered alloy and automatic powder feeding device
According to the retained mandrel operating mode, adopt Co-based alloy powder, its Chemical Composition is by weight percentage: C:0.2-0.3%, Cr:25-30%, Ni:2-4%, Mo:4.5-6.5%, Si:0.7-1.5%, surplus are Co.Regulate automatic powder feeding device powder feeding rate, to satisfy the required powder feeding rate of coat-thickness, powder feeding rate is 5-20g/min;
2) circular light beam laser cladding technological parameter
Condensing lens f=300～400mm
Cladding power P=3000～10000W
Spot diameter D=2～6mm
Cladding scan velocity V=200～1000mm/min
Overlapping rate 40～60%
The rectangular light beam laser melting coating
Cladding power P=3000～10000W
Rectangular light spot length * wide=(8～10) mm * (1～2) mm
Cladding scan velocity V=100～800mm/min
Overlapping rate 40～60%;
(3) subsequent heat treatment
In heat treatment furnace the retained mandrel behind the laser melting coating being carried out high tempering handles: temperature is 550-600 ℃, and stress relief annealing 5～7 hours is with the unrelieved stress after coating and matrix change behind the minimizing laser melting coating.
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|---|---|---|---|
| CN2009100133286A CN101994114A (en) | 2009-08-24 | 2009-08-24 | Laser cladding wear-resisting and heat fatigue-resisting alloy coating process for manufacturing hot rolled seamless steel tube rolling mill retained mandrel |
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| CN2009100133286A CN101994114A (en) | 2009-08-24 | 2009-08-24 | Laser cladding wear-resisting and heat fatigue-resisting alloy coating process for manufacturing hot rolled seamless steel tube rolling mill retained mandrel |
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Application publication date: 20110330 |