CN101406995B - Ultra-low carbon nitrogen reinforced self-protecting flux-cored wire - Google Patents
Ultra-low carbon nitrogen reinforced self-protecting flux-cored wire Download PDFInfo
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- CN101406995B CN101406995B CN2007101756798A CN200710175679A CN101406995B CN 101406995 B CN101406995 B CN 101406995B CN 2007101756798 A CN2007101756798 A CN 2007101756798A CN 200710175679 A CN200710175679 A CN 200710175679A CN 101406995 B CN101406995 B CN 101406995B
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Abstract
The invention provides a super-low carbon-nitrogen strengthening self-protection flux-cored wire. The flux-cored wire has a steel belt as an outer skin. The flux core comprises the following components in weight percentage: 40 to 45 percent of chromium powder, 12 to 15 percent of nickel, 1.6 to 3 percent of molybdenum, 2 to 4 percent of 75ferrosilicon, 4 to 6 percent of manganese, 1 to 10 percent of iron powder, 4 to 8 percent of rutile, 3 to 7 percent of fluorite, 1 to 6 percent of lithium fluoride, 5 to 10 percent of barium fluoride, 5 to 8 percent of marble, 3 to 5 percent of sodium carbonate, 1 to 10 percent of aluminum-magnesium alloy, 0 to 1 percent of sodium fluoride, 0 to 2 percent of titanium dioxide, 0 to 2 percent of iron red, 0 to 5 percent of ferrotitanium, 0 to 5 percent of quartz and 0 to 4 percent of siliceous lime.
Description
Technical field
The present invention relates to a kind of self-protection flux-cored wire, relate in particular to a kind of ultra-low carbon nitrogen reinforced self-protecting flux-cored wire.
Background technology
The continuous casting roller is in the double action of high temperature billet steel and cooling water, and the surface is prone to produce defectives such as cold and hot fatigue crack, burn into wearing and tearing.As the built-up welding repair materials, the overlay cladding of its hardfacing alloy requires to have good cold-resistant thermal fatigue, mar proof, corrosion resistance, to improve the service life of continuous casting roller.
The self-protection flux-cored wire built-up welding is a kind of novel surface reinforcement technique.Need not any protective gas and solder flux in weld deposit process, easy and simple to handle.Advantages such as it is high with efficient, dilution rate is low, integrated cost is low become present less expensive, one of solder technology easily.
Summary of the invention
The ultra-low carbon nitrogen solution strengthening self-protection flux-cored wire that the purpose of this invention is to provide a kind of welding technological properties and satisfactory mechanical property.
For realizing above-mentioned purpose, ultra-low carbon nitrogen reinforced self-protecting flux-cored wire provided by the invention is a crust with the steel band, and the medicine core component is:
Chromium powder: 40～45%;
Nickel: 12～15%;
Molybdenum: 1.6～3%;
75 ferrosilicon: 2～4%;
Manganese: 4～6%;
Iron powder: 1～10%;
Natural rutile: 4～8%;
Fluorite: 3～7%;
Lithium fluoride: 1～6%;
Sodium fluoride: 0～1%;
Barium fluoride: 5～10%
Marble: 5～8%;
Sodium carbonate: 3～5%
Almag: 1～10%;
Titanium white powder: 0～2%;
Iron oxide red: 0～2%;
Ferrotianium: 0～5%;
Quartzy: 0～5%;
Wollastonite: 0～4%.
Described ultra-low carbon nitrogen reinforced self-protecting flux-cored wire, wherein steel band is the ordinary carbon steel band.
Described ultra-low carbon nitrogen reinforced self-protecting flux-cored wire, wherein, thickness of strips * width is: 0.5mm * 12.5mm.
Described ultra-low carbon nitrogen reinforced self-protecting flux-cored wire, wherein, filling rate is 30%.
Described ultra-low carbon nitrogen reinforced self-protecting flux-cored wire, wherein, gage of wire is 1.6mm～2.4mm.
Ultra-low carbon nitrogen reinforced self-protecting flux-cored wire of the present invention takes off slag when built-up welding easy, welding bead surface pore-free slag inclusion, and the welding wire wellability is good, and it is little to splash, and mechanical performance is good.
Description of drawings
After Fig. 1 is ultra-low carbon nitrogen reinforced self-protecting flux-cored wire built-up welding of the present invention, the microphotograph of its capping tissue (200 times).
The specific embodiment
Ultra-low carbon nitrogen reinforced self-protecting flux-cored wire of the present invention adopts the alloy nitrogen fixation process from air, to obtain needed nitrogen in the deposited metal, and in alloyed powder, does not add nitride.
Ultra-low carbon nitrogen reinforced self-protecting flux-cored wire provided by the present invention, the source of required nitrogen element is in weld deposit process, from air, to obtain in its deposited metal.The essential element nitrogen source is in airborne nitrogen in the alloy system.In welding process, although adding volume boiling point is low in the core wire, be prone to form gas-forming agent--the fluoride that the steam capsule can squeeze reaction zone surrounding air, always there is nitrogen more or less to invade the molten bath district.Nitrogen can be dissolved in the motlten metal when high temperature in a large number, at high temperature forms stable nitride with chromium, iron, silicon, molybdenum etc., and this is an important source of nitrogen in the cladding metal; The solubility of nitrogen reduces suddenly during weld pool solidifies, and oversaturated nitrogen is outwards overflowed with the form of bubble, when the crystallization rate of weld seam during greater than the effusion speed of nitrogen, is easy to generate pore.Therefore, in this welding wire, added a certain amount of strong nitride forming element--almag, generated stable nitride fast and suppress pore, this is another important source of nitrogen in the cladding metal.The quantity of nitride surpasses certain limit, can cause the decline of weld metal impact flexibility; And nitrogen content is low excessively, and the nitride in the cladding metal is few, poor mechanical property.Source according to above-mentioned nitrogen knows that the amount of alloying element chromium, iron, silicon, molybdenum remains unchanged in the medicine core, can only change almag content and regulate the quantity of nitride and then the nitrogen content of control cladding metal.Fluoride in the core wire be prone to form the steam capsule, squeezes the reaction zone ambient air, and the amount that generates gas directly influences the amount that nitrogen is invaded the molten bath in the air, so the ratio of fluoride and almag is the key that obtains required nitrogen content among the present invention.
Drug core component mass percentage content of the present invention is following:
Chromium powder: 40～45%, nickel: 12～15%, molybdenum: 1.6～3%, 75 ferrosilicon: 2～4%, manganese: 4～6%, rutile: 4～8%, fluorite: 3～7%, lithium fluoride: 1～6%; Barium fluoride: 5～10%; Marble: 5～8%; Sodium carbonate: 3～5%; Almag: 1～10%; Iron powder: 1～10%;
Also possibly contain following several kinds of compositions in the welding wire: sodium fluoride: 0～1%; Titanium white powder: 0～2%; Iron oxide red: 0～2%; Ferrotianium: 0～5%, quartz: 0～5%; Wollastonite: 0～4% etc.
The effect of main component in its medicine core:
Chromium: the intensity and the hardness that improve deposited metal; High temperature excellent high-temperature red hardness and high-temperature oxidation resistance; Acted on good corrosion resistance simultaneously with nickel, Cr content will fully just can be guaranteed decay resistance, 12～14%Cr resistance to high temperature oxidation, excellent corrosion resistance in the deposited metal.
Ni: guarantee ductility and obtain martensitic structure that be the increase that prevents linear expansion coefficient and the reduction of Ac1 transformation temperature, content should be limited in below 5% in the deposited metal.
Mo: carbon, nitride forming element, form double carbide, in the continuous casting roller, make every effort to Mo through high rigidity
2The C carbide separate out the generation post-curing, when helping to improve body of roll working lining wearability, also improve hardenability and heat crack resistance.But the Mo too high levels can be facilitated the growth of net carbide, and fragility is increased.For this reason, Mo content is controlled at below 1.5% in the continuous casting roller deposited metal.
Almag and ferrotianium: as deoxidier, can fixed nitrogen, reduce the pore on the bead welding.
Manganese: deoxidation, desulfurization replenishes the manganese content of weld seam.
Rutile: main component TiO
2Fusing point is 1560 ℃ of weak oxide property, in welding wire, adds to make arc stability, and the molten bath is tranquil.Appearance of weld is attractive in appearance, and slag covers, and makes that to take off slag easy.
Fluorite: 1375 ℃ in low melting point fluoride, the calcirm-fluoride boiling point is low, is prone to form CaF
2The steam capsule, the surface that prevents air intrusion molten steel; Strong diluent makes the gas in the weld seam be easy to overflow, and combines to generate HF with hydrogen and volatilize, and reduces white point and is inclined to.
Lithium fluoride+barium fluoride+sodium fluoride: fluoride, can be at the most advanced and sophisticated protection steam that forms of molten drop, prevent the intrusion of nitrogen and oxygen in the air.Support very short electric arc during the barium fluoride welding, the nitrogen amount that molten drop absorbs when having reduced the self-protection flux-cored wire welding.The viscosity and the removability of slag of fluoride scalable slag.
Calcium carbonate+sodium carbonate: carbonate, when built-up welding, resolve into carbon dioxide, the protection weld seam is not by oxygen, nitrogenize.In welding wire, add the generation that a large amount of carbonate can suppress nitrogen pore fully, reduce the addition of almag and aluminium, can obtain good impact flexibility.Add and to cause when too much and splash, so addition is moderate.
Titanium white powder: can produce slag breezily, evenly weld seam is protected in covering in welded joints, reduces dry slag, and it is convenient to take off slag, the ability stable arc, and minimizing is splashed.Because a little less than the flowability of this powder, so consumption is little, welding wire is produced in control, and powder is not smooth at present.
Iron oxide red: slag former, the dilution slag can be accelerated to weld speed and fusion penetration, makes skull light, but can cause and splash.
Quartzy: slag former can increase the active degree of slag less than 1% quartz.
Wollastonite: arc stabilizer, slag former.The physical and chemical performance of adjustment slag improves the removability of slag.
Ordinary carbon steel band H08A thickness (mm) * width (mm) is: 0.5mm * 12.5mm; Medicine core composition is: chromium powder: 450 grams, nickel: 120 grams, molybdenum: 16 grams, 75 ferrosilicon: 21 grams, manganese: 50 grams; Iron powder: 13 grams, almag: 20 grams, barium fluoride: 60 grams, lithium fluoride: 20 grams; Sodium carbonate: 40 grams, marble: 60 grams, rutile: 80 grams, fluorite: 40 grams.
Embodiment 2
Ordinary carbon steel band H08A thickness (mm) * width (mm) is: 0.5mm * 12.5mm; Medicine core composition is: chromium powder: 450 grams, nickel: 120 grams, molybdenum: 16 grams, 75 ferrosilicon: 21 grams, manganese: 50 grams; Iron powder: 23 grams, almag: 10 grams, ferrotianium: 50 grams, titanium white powder: 17 grams, iron oxide red: 10 grams; Sodium fluoride: 8 grams, barium fluoride: 58 grams, lithium fluoride: 10 grams, sodium carbonate: 37 grams; Wollastonite: 13 grams, rutile 69 grams, fluorite: 38 grams, quartz: 10 grams.
Embodiment 3
Ordinary carbon steel band H08A thickness (mm) * width (mm) is: 0.5mm * 12.5mm; Medicine core composition is: chromium powder: 450 grams, nickel: 120 grams, molybdenum: 16 grams, 75 ferrosilicon: 21 grams, manganese: 50 grams; Iron powder: 23 grams, almag: 43 grams, ferrotianium: 10 grams, titanium white powder: 10 grams; Iron oxide red: 17 grams, sodium fluoride: 16, barium fluoride: 58 grams, lithium fluoride: 22 grams; Sodium carbonate: 37 grams, rutile 69 grams, fluorite: 38 grams.
Embodiment 4
Ordinary carbon steel band H08A thickness (mm) * width (mm) is: 0.5mm * 12.5mm; Medicine core composition is: chromium powder: 450 grams, nickel: 120 grams, molybdenum: 16 grams, 75 ferrosilicon: 21 grams; Manganese: 50 grams, iron powder: 23 grams, almag: 55 grams, iron oxide red: 16 grams; Barium fluoride: 58 grams, lithium fluoride: 10 grams, sodium carbonate: 37 grams, wollastonite: 25 grams; Rutile 69 grams, fluorite: 38 grams, quartz: 12 grams.
For investigating rutile and fluorite proportionate relationship, the spy is configured to following seven groups with rutile and fluorite content: rutile (g)/fluorite (g)=240/40,120/40,80/40; 40/40,20/40,13/40,6.5/40; Under the situation that keeps all the other components (only changing iron content) to remain unchanged, iron content is respectively: 0 gram, 120 grams, 160 grams; 200 grams, 220 grams, 227 grams, 233.5 grams.Filling rate is 30%.Configuration medicine core 1000 grams, all reagent granularities were all wanted 40 mesh sieves, and the medicine core for preparing mixed 15 minutes in mixed powder machine, in 150 ℃ heating furnace, toasted 20 minutes then, except that water treatment.On welding wire production machine, being drawn into diameter again is Φ 2.4mm welding wire, carries out soldering test, investigates processing performance.See table 1.
Table 1: rutile/fluorite content is to the influence of processing performance
Can know that by experiment the 3rd group of data are better, finally obtain: rutile is 80 grams, when calcirm-fluoride is 40 grams, and arc stability, it is easy to take off slag, welding bead surface pore-free slag inclusion, the welding wire wellability is good, and the little welding technological properties that waits splashes.Mechanical performance is good.
The deposited metal composition is seen table 2 after the built-up welding.
Table 2: development resurfacing welding material deposited metal composition (canonical analysis example value)
After the built-up welding its capping of deposited metal be organized as cryptocrystalline martensite and nitride distribution (see figure 1) that some are tiny, organize that more tiny evenly as-welded hardness is 45～50HRC, be fit in the steel mill the particularly field repair of continuous casting roller of multiple roller.
Claims (5)
1. a ultra-low carbon nitrogen reinforced self-protecting flux-cored wire is a crust with the steel band, and the medicine core component is:
Chromium powder 45%; Nickel 12%; Molybdenum 1.6%; 75 ferrosilicon 2.1%; Manganese 5%; Iron powder 2.3%; Almag 4.3%; Ferrotianium 1.0%; Titanium white powder 1.0%; Iron oxide red 1.7%; Sodium fluoride 1.6%; Barium fluoride 5.8%; Lithium fluoride 2.2%; Sodium carbonate 3.7%; Rutile 6.9%; Fluorite 3.8%.
2. ultra-low carbon nitrogen reinforced self-protecting flux-cored wire as claimed in claim 1, wherein steel band is the ordinary carbon steel band.
3. according to claim 1 or claim 2 ultra-low carbon nitrogen reinforced self-protecting flux-cored wire, wherein, thickness of strips * width is: 0.5mm * 12.5mm.
4. ultra-low carbon nitrogen reinforced self-protecting flux-cored wire as claimed in claim 1, wherein, filling rate is 30%.
5. ultra-low carbon nitrogen reinforced self-protecting flux-cored wire as claimed in claim 1, wherein, gage of wire is 1.6mm～2.4mm.
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| CN2007101756798A CN101406995B (en) | 2007-10-10 | 2007-10-10 | Ultra-low carbon nitrogen reinforced self-protecting flux-cored wire |
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| CN2007101756798A CN101406995B (en) | 2007-10-10 | 2007-10-10 | Ultra-low carbon nitrogen reinforced self-protecting flux-cored wire |
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| CN101406995B true CN101406995B (en) | 2012-02-22 |
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Cited By (1)
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| CN104095134A (en) * | 2014-07-10 | 2014-10-15 | 桐乡市绿康菊业有限公司 | Fixation device special for chrysanthemum bud fixation machine |
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| CN101905396B (en) * | 2010-08-20 | 2012-09-05 | 河北翼辰实业集团有限公司 | Self-protecting flux-cored wire for hardfacing |
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| WO2002090038A1 (en) * | 2001-05-07 | 2002-11-14 | Alfa Laval Corporate Ab | Material for coating and product coated with the material |
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| CN101011785A (en) * | 2007-02-01 | 2007-08-08 | 北京工业大学 | Cr13 series overlay welding self-protection flux-cored wire |
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| CN104095134A (en) * | 2014-07-10 | 2014-10-15 | 桐乡市绿康菊业有限公司 | Fixation device special for chrysanthemum bud fixation machine |
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