CN102198568A - Flux cored wire for impact-resistant nonstick steel overlaying - Google Patents
Flux cored wire for impact-resistant nonstick steel overlaying Download PDFInfo
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- CN102198568A CN102198568A CN2010101326170A CN201010132617A CN102198568A CN 102198568 A CN102198568 A CN 102198568A CN 2010101326170 A CN2010101326170 A CN 2010101326170A CN 201010132617 A CN201010132617 A CN 201010132617A CN 102198568 A CN102198568 A CN 102198568A
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Abstract
The invention discloses a flux cored wire for impact-resistant nonstick steel overlaying. The flux cored wire comprises the following components in percentage by weight: 0.4-0.5 percent of carbon, 12.5-14.0 percent of chromium, 1.5-2.0 percent of manganese, 0.5-0.8 percent of silicon, 2.0-2.5 percent of nickel, 1.0-1.8 percent of molybdenum, 0.5-0.8 percent of vanadium, 0.2-0.5 percent of niobium, less than or equal to 0.010 percent of phosphorus, less than or equal to 0.010 percent of sulfur and the balance of Fe. The flux cored wire is used for surface overlaying strengthening of a wide and heavy plate frame roller; no welding defects such as bubbles, cracks and the like exist on the overlaid surface; and the flux cored wire has the mechanical performance such as high strength, impact toughness and the like, crucially has steel sticking resistance and meets the production requirements of a wide and heavy plate production line.
Description
Technical field
The present invention relates to welding material, particularly the flux cored wire of shock resistance non-stick steel built-up welding.
Background technology
Flux cored wire is promptly used plastic sheet metal strip, adopts special fabrication processes, with the tubulose welding wire material that the filler cladding is made therein, its outside stainless steel band, inner medicine core alloy powder.
Modern technologies are normally used a silk material forming machine, plastic strip-rolling is become the u type, to insert wherein with the even filler that multiple pre-platform bronze end is mixed with, through multiple roll tandem rolling (minimum tens pairs of running roller number, nearly two, 30 pairs), closure of openings is got up the pipe silk that rerolls and make required size.
Although the development of flux cored wire starts from 1920's, extensive use is in recent years thing still, its main cause be it manufacturing process and pipe in the immature and imperfection of filler.After the seventies, people have grasped the manufacturing technology of various flux cored wires, and it uses just flourish.
The characteristics of the impact endurance test shock of the heavy and slab course of conveying of high strength steel grade (X80, stainless steel, Q550, Q690), the slab own wt of producing at the Wide and Thick Slab production line, require resurfacing welding material not only will possess higher hardness and wearability, more must possess good impact flexibility (anti-strip ability) and resisting viscosity steel ability, could satisfy instructions for use.
Wide and Thick Slab production line standing roller frame roller is installed on the import and export of vertical miller, the outlet of finishing mill, and every block of finished product steel plate passes through by this, and the quality of roll surface directly influences the surface quality of steel plate.
Breast roll is a solid forging, material 34CrNiMo6 modifier treatment, and hardness HB265-320, yield strength=540MPa, tensile strength=740-890MPa, percentage elongation=12% impacts Akv=41J, the no built-up welding protection in surface.Used only 12 months, roll surface sliding injury serious and obvious (about 15mm is monolateral) influences slab quality.Following machine is repaired breast roll, repairs and adopts surface overlaying.
The test of built-up welding for the first time, adopt 2Cr13MnSi built-up welding reparation, hardness reaches HRC45, yield strength=750MPa, tensile strength=950-1050MPa, percentage elongation=12% impacts Akv=31J hardness and wearability and obviously improves, use on the machine that process generation fritter loses flesh and a small amount of steel bonding phenomenon, can not satisfy instructions for use.Short two months in October, 08 to December, reach 13.21 hours the fault time of on-the-spot reconditioning breast roll, has a strong impact on the direct motion and the plate surface quality of slab.
The welding wire main component of original 2Cr13MnSi is: carbon 0.4-0.5%, chromium 12.5-14.0%, manganese 0.8-1.0%, silicon 0.5-0.8%, phosphorus≤0.020%, sulphur≤0.020%, all the other Fe.Though possessed a certain amount of silicon, manganese in the deposited metal, its welding performance is poor, is easy to generate fire check and steel bonding phenomenon.
Summary of the invention
The object of the present invention is to provide the flux cored wire of a kind of shock resistance non-stick steel built-up welding, the surface overlaying that is used for the Wide and Thick Slab breast roll is strengthened, weld defects such as the surperficial pore-free after the built-up welding, flawless, and have mechanical performances such as higher intensity, impact flexibility, most critical be to possess the resisting viscosity steel performance, satisfy Wide and Thick Slab Production Line needs.
For achieving the above object, technical scheme of the present invention is,
The flux cored wire of shock resistance non-stick steel built-up welding, its composition percentage by weight is: carbon 0.4～0.5%, chromium 12.5～14.0%, manganese 1.5～2.0%, silicon 0.5～0.8%, nickel 2.0～2.5%, molybdenum 1.0～1.8%, vanadium 0.5～0.8%, niobium 0.2～0.5%, phosphorus≤0.010%, sulphur≤0.010%, all the other are Fe.
In deposited metal of the present invention,, also comprised following ingredients except a certain amount of silicon (silicon can significantly improve the elastic limit of steel, yield point and tensile strength), manganese (enough toughness is not only arranged, and higher intensity and hardness are arranged):
Nickel: if nickel content surpasses 6%, can enlarge the austenitic area, reduce the Ms point, unfavorable to welding, be easy to generate fire check; Nickel content is less than 0.5%, and performance boost is not obvious.The present invention considers above-mentioned characteristic and cost factor, determines that nickel content is 2.0～2.5%.
Molybdenum: can make the grain refinement of deposited metal, improve quenching degree and heat resistance energy, keep enough intensity and creep resisting abilities when high temperature, can improve plasticity and toughness, take all factors into consideration above-mentioned performance and cost factor, molybdenum of the present invention is 1.0～1.8%;
Vanadium: in thick martensitic structure, grain boundary carbide and " second phase " tissue that distributes along crystal boundary are the main causes of impelling martensitic stain less steel to crack.Production practices show, add 0.1%～0.45% vanadium in the martensitic stain less steel after, but crystal grain thinning reduces grain boundary carbide and suppresses " second phase " tissue generating, so can improve crack resistance.But 0.5% vanadium thinning microstructure crystal grain improves intensity and toughness.The carbide that vanadium and carbon form can improve anti-hydrogen-type corrosion ability under HTHP;
Niobium: suppress the formation of chromium carbide, the anti-tempered performance of deposited metal is improved.Because the submerged-arc welding cooling velocity is slow, the content that suppresses the welding bead intercrystalline corrosion should be 1.75-2.0 greater than 7C+0.35, but a large amount of like this niobiums but is harmful to, and produces the tendency aggravation of bead crack, takes off the slag difficulty, has directly influenced welding quality.Therefore consider solderability, the content of niobium is controlled in the safe range.Niobium of the present invention is 0.2～0.5%, and an amount of niobium energy crystal grain thinning and the superheated susceptivity and the temper brittleness of reduction deposited metal improve intensity.
The present invention finally shows in the 2Cr13MnSi performance and has improved anti-brittleness index, plays " losing flesh " problem of eliminating in the use.
The problem of " steel bonding " is mainly solved by the adding of molybdenum, the part molybdenum bisuphide compound of formation, and its coefficient of friction is low, is difficult for " taking " sheet metal to the built-up welding surface of the work, thereby avoids " steel bonding ".
Material of the present invention belongs to the martensitic stain less steel category, and the nickel of interpolation, vanadium, niobium have improved elevated temperature strength, and niobium is again the reinforcement compound of carbon, and difficult branch parses, and plays the effect of crystal grain thinning.Therefore, bulk strength and impact flexibility increase.An amount of nickel and molybdenum further improve corrosion resistance on stainless basis, and then play the purpose that prevents steel bonding.And the raising of welding wire combination property also must be considered the content problem of P, S, has only the extremely low better performance of impurity competence exertion material.
As everyone knows, p and s can make its deterioration in material properties as a kind of impurity element in the stainless steel, so the content of control impurity must be from making the outside stainless steel belt of welding wire, selection is crucial, has only content to be lower than 0.005% just can adopt; Inner medicine core alloy powder is the broken powder of prealloy, and impurity content is lower than 0.01%.Simultaneously because submerged-arc welding need be used 260 solder flux, the detection P of true reactor postwelding, S content will≤0.015%, and this belongs in welding material at home than low impurity content (be generally≤0.025).Yield strength=850MPa, tensile strength=950-1100MPa, percentage elongation=18% impacts Akv=38J.
Beneficial effect of the present invention
Original breast roll roll surface can satisfy the requirement of common operating mode substantially, but when the slab production capacity promotes with rolling high-strength degree steel grade significantly, defective such as steel bonding just takes place, peel off.
Flux cored wire of the present invention is further perfect on the basis that keeps original advantage, with the breast roll case hardness height of its built-up welding, non-stick steel, strong shock resistance.Adopt to use behind the machine on the standing roller frame roller of this flux cored wire built-up welding reparation and do not take place so far together that roll surface has also alleviated direct labor's labour intensity simultaneously greatly in the fault of machine maintenance mill.
Adopt flux cored wire of the present invention (being designated hereinafter simply as the pipe silk) built-up welding to make coating, compare, very significantly advantage is arranged with other stiff dough technologies:
1) compare with alloy powder thermal spraying (weldering), pipe silk built-up welding coating layer thickness is unrestricted, and powder coating thickness generally is no more than 5mm; Its Bond Strength of Coating and general welding suitable (being higher than 750Mpa), and the bond strength of powder coating is 20～250MPa.
2) stock utilization with the built-up welding of pipe silk is 97%, and the stock utilization of manual welding rod built-up welding is 55%～65%, and the stock utilization of thermal spraying (weldering) alloy powder is 50%～80%.
3) produce high alloy, the high hardness material that solid core welding wire can not be made with Guan Sineng.
4) with pipe silk than the easier adjustment composition of solid core welding wire, in adapting to, small lot batch manufacture, convenient, flexible, manufacturing cost is also low.
5) be 8～12kg/h with pipe silk built-up welding application rate, and manual electric welding application rate is 1～3kg/h, the gas welding application rate is 1～4kg/h.Not only speed is fast for the built-up welding of pipe silk, and coating surface is more smooth, and is easy to operate, grasps easily.
6) advantage of above pipe silk built-up welding is when making the large tracts of land hard-surface coating, more apparent outstanding.
The specific embodiment
The present invention will be further described below in conjunction with embodiment.
The embodiment composition adopts conventional flux cored wire preparation method to make referring to table 1.
The standing roller frame roller is repaired in built-up welding:
1) prepares before the weldering
1. roller-way is checked, machined, to remove defective, fatigue layer:
2. the source of welding current adopts MZ.1-1000 type automatic submerged arc welding machine;
3. do not have rust, wet goods foreign material of welding wire in the welding material must be at 200～300 ℃ of baking 5h down, removal moisture before solder flux uses;
4. built-up welding turntable velocity of rotation is stable, should be able to guarantee that the welding bead of bead-on-plate weld is even.
2) weld preheating
Because the material carbon equivalent Ceq=C+Mn of institute's built-up welding roller-way ,/6+Si/24+Cr/5+Mo/4=0.68 is higher, the relatively poor L of solderability, therefore the built-up welding roller should be delivered in the heat-treatment furnace before the built-up welding, slowly be heated to design temperature, and be incubated one and regularly ask, remove the preceding stress of weldering, warm-up curve as shown in Figure 2.
3) welding parameter
For guaranteeing surfacing quality, through a large amount of experiments, welding parameter is set at the most at last: electric current 380～420A, and voltage 28～32V, gage of wire Φ 4, workpiece built-up welding speed 480～500mm/min, the weld seam amount of lap is about 60% of weld width.
4) after welding treatment
The built-up welding interlayer temperature should remain on the Ms point of resurfacing welding material more than the temperature, will weld roller after the built-up welding as early as possible and be transported in the heating furnace, is heated to 580 ℃ with the speed of 60 ℃/h, and constant temperature 8h is cooled to normal temperature gradually and comes out of the stove, and eliminates stress.
5) finished product processing.
The present invention adopts the design principle and the structure of original flux cored wire substantially.The composition of flux cored wire is implemented to optimize improvement, its bulk strength, impact flexibility and resistance to corrosion are improved greatly, thoroughly eliminate breast roll roll surface steel bonding phenomenon.The present invention can be applied even more extensively the roller class reparation in other similar operating mode.
Table 1 unit: percentage by weight
| Embodiment | Carbon | Chromium | Manganese | Silicon | Nickel | Molybdenum | Vanadium | Niobium | Phosphorus | Sulphur |
| 1 | 0.40 | 12.5 | 1.5 | 0.5 | 2.0 | 1.0 | 0.5 | 0.2 | 0.01 | 0.01 |
| 2 | 0.50 | 14.0 | 2.0 | 0.8 | 2.5 | 1.8 | 0.8 | 0.5 | 0.01 | 0.01 |
| 3 | 0.45 | 12.8 | 1.6 | 0.55 | 2.4 | 1.1 | 0.55 | 0.25 | 0.01 | 0.01 |
| 4 | 0.44 | 13.2 | 1.7 | 0.65 | 2.15 | 1.2 | 0.5 | 0.28 | 0.01 | 0.01 |
| 5 | 0.43 | 13.7 | 1.8 | 0.75 | 2.1 | 1.3 | 0.65 | 0.3 | 0.005 | 0.01 |
| 6 | 0.42 | 13.5 | 1.9 | 0.6 | 2.25 | 1.4 | 0.6 | 0.35 | 0.01 | 0.005 |
| 7 | 0.46 | 13.8 | 1.7 | 0.7 | 2.25 | 1.7 | 0.75 | 0.38 | 0.005 | 0.005 |
| 8 | 0.48 | 13.6 | 1.85 | 0.68 | 2.3 | 1.6 | 0.7 | 0.4 | 0.005 | 0.01 |
| 9 | 0.49 | 13.0 | 1.50 | 0.58 | 2.35 | 1.5 | 0.68 | 0.45 | 0.01 | 0.01 |
| 10 | 0.41 | 12.9 | 1.55 | 0.78 | 2.45 | 1.55 | 0.64 | 0.48 | 0.005 | 0.005 |
Claims (1)
1. the flux cored wire of shock resistance non-stick steel built-up welding, its composition percentage by weight is:
Carbon 0.4～0.5%
Chromium 12.5～14.0%
Manganese 1.5～2.0%
Silicon 0.5～0.8%
Nickel 2.0～2.5%
Molybdenum 1.0～1.8%
Vanadium 0.5～0.8%
Niobium 0.2～0.5%
Phosphorus≤0.010%
Sulphur≤0.010%
All the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010132617 CN102198568B (en) | 2010-03-25 | 2010-03-25 | Flux cored wire for impact-resistant nonstick steel overlaying |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010132617 CN102198568B (en) | 2010-03-25 | 2010-03-25 | Flux cored wire for impact-resistant nonstick steel overlaying |
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| CN102198568A true CN102198568A (en) | 2011-09-28 |
| CN102198568B CN102198568B (en) | 2013-03-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105290644A (en) * | 2015-10-22 | 2016-02-03 | 镇江市华盈轧辊有限公司 | Flux-cored wire for remanufacturing cold hardening resisting supporting roll through bead welding |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62224493A (en) * | 1986-03-24 | 1987-10-02 | Kobe Steel Ltd | Wire for welding 9cr-2mo steel |
| EP0489648A1 (en) * | 1990-12-04 | 1992-06-10 | Tecphy | Stainless steel usable for applying a hard facing to hot-work tools and tools provided with a hard facing made from this stainless steel |
| CN1209372A (en) * | 1998-07-14 | 1999-03-03 | 王玉彬 | Special flux-cored wirecord for repairing continuous-casting roller |
| CN101269447A (en) * | 2007-03-23 | 2008-09-24 | 中国科学院金属研究所 | Heat-proof stainless steel gas protection welding wire of martensite |
| CN101293308A (en) * | 2008-06-12 | 2008-10-29 | 上海施威焊接产业有限公司 | Solder wire formula for ultra-large type backing roll renovation layer |
-
2010
- 2010-03-25 CN CN 201010132617 patent/CN102198568B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62224493A (en) * | 1986-03-24 | 1987-10-02 | Kobe Steel Ltd | Wire for welding 9cr-2mo steel |
| EP0489648A1 (en) * | 1990-12-04 | 1992-06-10 | Tecphy | Stainless steel usable for applying a hard facing to hot-work tools and tools provided with a hard facing made from this stainless steel |
| CN1209372A (en) * | 1998-07-14 | 1999-03-03 | 王玉彬 | Special flux-cored wirecord for repairing continuous-casting roller |
| CN101269447A (en) * | 2007-03-23 | 2008-09-24 | 中国科学院金属研究所 | Heat-proof stainless steel gas protection welding wire of martensite |
| CN101293308A (en) * | 2008-06-12 | 2008-10-29 | 上海施威焊接产业有限公司 | Solder wire formula for ultra-large type backing roll renovation layer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105290644A (en) * | 2015-10-22 | 2016-02-03 | 镇江市华盈轧辊有限公司 | Flux-cored wire for remanufacturing cold hardening resisting supporting roll through bead welding |
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