CN103785976A - Hot roll surfacing submerged arc flux-cored welding wire and preparation method for same - Google Patents
Hot roll surfacing submerged arc flux-cored welding wire and preparation method for same Download PDFInfo
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- CN103785976A CN103785976A CN201310694862.4A CN201310694862A CN103785976A CN 103785976 A CN103785976 A CN 103785976A CN 201310694862 A CN201310694862 A CN 201310694862A CN 103785976 A CN103785976 A CN 103785976A
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- 238000003466 welding Methods 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 27
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 238000011049 filling Methods 0.000 claims abstract description 4
- 239000003814 drug Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000012387 aerosolization Methods 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000008358 core component Substances 0.000 claims description 6
- 229940079593 drug Drugs 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 25
- 239000010959 steel Substances 0.000 abstract description 25
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 7
- 239000001257 hydrogen Substances 0.000 abstract description 7
- 239000012535 impurity Substances 0.000 abstract description 6
- 230000004907 flux Effects 0.000 abstract description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract 1
- 150000001247 metal acetylides Chemical class 0.000 abstract 1
- 229910001092 metal group alloy Inorganic materials 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 238000009827 uniform distribution Methods 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 20
- 239000002184 metal Substances 0.000 description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 239000000463 material Substances 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 8
- 229910000859 α-Fe Inorganic materials 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000005336 cracking Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000011417 postcuring Methods 0.000 description 6
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 238000005275 alloying Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 208000025599 Heat Stress disease Diseases 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 229910001567 cementite Inorganic materials 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000007885 magnetic separation Methods 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- 229910000616 Ferromanganese Inorganic materials 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 2
- 229910001145 Ferrotungsten Inorganic materials 0.000 description 2
- 108010038629 Molybdoferredoxin Proteins 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- HBELESVMOSDEOV-UHFFFAOYSA-N [Fe].[Mo] Chemical compound [Fe].[Mo] HBELESVMOSDEOV-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006356 dehydrogenation reaction Methods 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009851 ferrous metallurgy Methods 0.000 description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 2
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000007630 basic procedure Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000320 mechanical mixture Substances 0.000 description 1
- 235000012459 muffins Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
- B23K9/046—Built-up welding on three-dimensional surfaces on surfaces of revolution
- B23K9/048—Built-up welding on three-dimensional surfaces on surfaces of revolution on cylindrical surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
本发明涉及一种热轧辊堆焊埋弧药芯焊丝及其制备方法，其药芯成分以重量百分比计为:5%～14%CaF2，0%～5%Na2SiF6，0%～5%BaCO3，0.1％～0.4％C，2.0%～5.5%Mn，14％～28％Cr，0.8%～6%Ni，2%～4.8%Si，0.6％～4.8％V，0.8％～7.2％W，2％～6％Mo，余量为Fe。药芯焊丝的钢带采用低碳，碳含量小于0.05%；药粉填充率为18%～28%，粒度为80～200目。本发明提出的埋弧焊药芯焊丝，具有堆焊层金属合金元素分布均匀、碳化物呈弥散状、硬度均匀、杂质及扩散氢含量低,抗裂性好，抗热疲劳能力强，堆焊层硬度均匀耐磨性高、使用寿命长的特点。The invention relates to a submerged arc flux -cored welding wire for hot roll surfacing welding and its preparation method. 5%BaCO 3 , 0.1%～0.4%C, 2.0%～5.5%Mn, 14%～28%Cr, 0.8%～6%Ni, 2%～4.8%Si, 0.6%～4.8%V, 0.8%～ 7.2% W, 2% ~ 6% Mo, and the balance is Fe. The steel strip of the flux-cored wire is low-carbon, with a carbon content of less than 0.05%; the powder filling rate is 18%-28%, and the particle size is 80-200 mesh. The submerged arc welding flux-cored welding wire proposed by the present invention has the advantages of uniform distribution of metal alloy elements in the surfacing layer, dispersed carbides, uniform hardness, low content of impurities and diffusible hydrogen, good crack resistance, strong thermal fatigue resistance, and surfacing welding. The hardness of the layer is uniform, the wear resistance is high, and the service life is long.
Description
Technical field
The present invention relates to field of welding material, relate in particular to a kind of hot roll built-up welding submerged arc flux-cored wire and preparation method thereof.
Background technology
Hot roll is the critical component of iron company, directly has influence on consumption, material cost and the maintenance expense of the output of production operational availability, rolled products of enterprise's rolling mill and quality, roll in its quality and service life.The course of work of hot roll is mainly born the wearing and tearing between metal and metal, and the abrasive wear that causes of the hard point such as surface of steel plate oxide skin, and hot roll more than 70% take wear out failure as main.Therefore require surfacing layer metal surface to there is high rigidity and high-wearing feature.When hot roll work simultaneously, the rolled parts that exceedes 900 ℃ with temperature contacts, and makes the maximum surface temperature of roll up to 600 ℃ of left and right, spray water again subsequently cooling, roll often rotates a circle and just stands the effect of a rapid heat cycle like this, and surface colds and heat succeed each other, and cold and hot fatigue cracking is serious.Therefore, require again it to have good cold & heat fatigue resisting.Heat fatigue cracking edge peels off, and the hard points such as spall and surface scale also can cause abrasive wear, and unstable wear lost efficacy.Roll contacts with high-temperature steel plate for a long time in addition, requires to have good red hardness, temper resistance and high temperature oxidation resistance.
In the face of severe condition of work like this, the hot roll flux-cored welding wire for overlaying welding of market supply now exists alloy element component deviation large mostly, skewness, make surfacing layer metal have larger thermal stress, be easy to cracking, fall piece, hardness number gap is large, cold & heat fatigue resisting and wearing no resistance, the defect such as service life is short.Therefore improve the performance of flux-cored wire, extend service life of hot roll, for improve iron and steel enterprise production efficiency, reduce production costs significant.
Summary of the invention
The hot roll built-up welding submerged arc flux-cored wire that the object of the present invention is to provide the high cracking resistance of a kind of high abrasion, has good welding operation performance, wearability and crack resistance.Mainly be applicable to the application of hot roll built-up welding.
For the existing bead-welding technology complexity of hot roll flux-cored wire in the past, overlay cladding is easy to produce heat, cold crack defect, surfacing layer metal hardness is inhomogeneous, wearability deficiency, the problem that service life is short, the present invention proposes one and comprises fritting alloyed powder, diffusible hydrogen inhibitor the heat treated submerged-arc welding flux-cored wire of process dehydrogenation, it is even that it has surfacing layer metal alloying elements distribution, carbide is disperse shape, hardness is even, impurity and diffusible hydrogen content are low, crack resistance is good, thermal fatigue resistance ability is strong, the even wearability of surfacing hardness is high, the feature of long service life.
Technical scheme of the present invention is:
A hot roll built-up welding submerged arc flux core for high cracking resistance high abrasion, its drug core component is by weight percentage: 5%～14%CaF
2, 0%～5%Na
2siF
6, 0%～5%BaCO
3, 0.4%～1.6%C, 2.0%～5.5%Mn, 14%～28%Cr, 0.8%～6%Ni, 2%～4.8%Si, 0.6%～4.8%V, 0.8%～7.2%W, 2%～6%Mo, surplus is Fe.
Alloyed powder Bian in drug core component makes fritting powder by aerosolization method, then adds in proportion in welding wire after mixing with mineral powder, makes the flux-cored wire that diameter is 3.2mm～5.0mm.
The preparation method of medicine core of the present invention: be that C, Cr, Mo, W, V and Ni are associated to the uniform fritting alloy powder of composition that bronze is the manufacture of aerosolization method, add fluoride and/or carbonate in medicine core simultaneously; Finished product welding wire is through the heat treatment of 300～450 ℃.
For improving the distributing homogeneity of alloying element in surfacing layer metal, adopt the aerosolization method in Ferrous Metallurgy, it is to utilize high velocity air directly to smash liquid metals and a kind of method of making metal dust.The basic procedure of gas-atomized powder is that alloy smelting, atomization, magnetic separation, dehydration, oven dry, high temperature reduction, muffin are pulverized, sieve division and combination is criticized.Adopting aerosolization method that carbon evanohm, ferromanganese, ferrosilicon, metallic nickel, vanadium iron, ferrotungsten, molybdenum-iron and iron powder in medicine core are connect to ratio adds melt in furnace, atomization to make the uniform single powder of composition, pass through magnetic separation, sieve, close and criticize, check to meet through composition to be again predetermined to be a point requirement, just become the alloy powder that can be used for manufacturing flux-cored wire.
Than multiple alloyed powder mechanical mixture effect, aerosolization alloyed powder has improved overlay cladding alloying elements distribution uniformity greatly, has reduced impurity content, and this,, to increasing the uniformity of surfacing layer metal hardness, improves thermal fatigue resistance and wearability.Reduce the thermal stress being caused by composition, Tissue distribution inequality, thereby the fire check sensitiveness of minimizing weld seam is very favourable simultaneously.In welding wire medicine core formula, add the diffusible hydrogen such as fluoride, carbonate inhibitor, drawing welding wire is after finished size simultaneously, the lubricant of welding wire remained on surface is carried out to mechanical chipping, and carry out the heat treatment of 300～450 ℃, further to reduce weld seam diffusible hydrogen, this is for reducing cold crack in weld seam, prevents that piece from appearring falling in weld metal and the too early destruction of causing has important function.
The design considerations of drug core component of the present invention is:
C: be strong austenitizing forming element and reduction Ms point element.In the design of resurfacing welding material, C is most important intensified element, is also to cause crisp element simultaneously.C has the effect of gap solution strengthening, increases the content of C in material, will impel the formation of twin crystal martensite, increases carbide quantity, reduces carbonization material dot spacing, increases post-curing peak value, obtains high hardness.But the increase of C content can make the impact toughness of material decline.
Cr: improve quenching degree, produce solution strengthening, promote the formation of M, in ferrochrome, in the time that Cr content is in 26%, the impact toughness of alloy can increase along with the increase of Cr content, but exceedes 26%, and impact toughness can sharply decline.The post-curing peak temperature of Cr is 500 ℃ of left and right.
V: be strong ferrite former, because itself and carbon, nitrogen, oxygen have strong adhesion, will form the very strong compound of corresponding stability, in steel, V is main post-curing element, and its peak temperature is greatly about 600～625 ℃.A small amount of V can crystal grain thinning, thereby improves intensity and the toughness of steel, but in the time that they are large numbers of, toughness that will damage steel.
W: can increase quenching degree, produce solution strengthening, suppress temper brittleness, appropriate interpolation, is conducive to the raising of impact toughness.The W elements adding, major part is distributed in solid solution, a small amount of carbide that enters into, when tempering time is longer, the Carbide Phases of formation is relatively many.W is one of important element improving the high-temperature stability of steel.
Si: be strong ferrite former, Si, except improving in ferrite and austenite the effect of solution strengthening, also has deoxidation, reduces the oxygen content in weld seam, thereby reduces the detrimental effect of oxygen Resistance of Weld Metal.
Mn: be stable austenite element, reduce Ms point, improve quenching degree.In addition, Mn or good deoxidier and desulfurizing agent, Mn and Si synergy are conducive to reduce the oxygen content in weld seam, be combined with S and form MnS, the FeS that prevents low melting point forms, and prevents from producing in weld metal the tendency of fire check, improves the ability of the heat resistanceheat resistant crackle of weld seam.Mn and iron can form solid solution, improve ferrite and austenitic intensity and hardness in steel, are again weak carbide formers simultaneously, replace the part Fe in cementite, form compound cementite.But excessive Mn content will make the grain coarsening of steel, the ductility of steel is reduced, toughness declines.
In the present invention, the steel band of flux-cored wire adopts the mild-carbon steel strip that carbon content is less than 0.05%, and the content of wherein controlling impurity element sulphur in steel band is less than 0.008%, and the content of phosphorus is less than 0.015%, and the content of nitrogen is less than 50ppm.The filling rate of medicinal powder is 18%～28%, and the granularity of medicinal powder is 80～200 orders.Steel band is rolled into after U-shaped and adds medicinal powder, seal into O type, and be drawn to finished size, the diameter of finished product welding wire is 3.2mm～5.0mm.
The present invention proposes one and comprises fritting alloyed powder, diffusible hydrogen inhibitor the heat treated submerged-arc welding flux-cored wire of process dehydrogenation, have surfacing layer metal alloying elements distribution evenly, carbide be disperse shape, hardness evenly, impurity and diffusible hydrogen content low, crack resistance is good, thermal fatigue resistance ability is strong, and the even wearability of surfacing hardness is high, the feature of long service life.
The specific embodiment
Alloyed powder except mineral powder in the each embodiment providing in table 1 is made to fritting alloyed powder by aeroponics, after mixing with the mineral powder of giving certainty ratio in formula, pack U-shaped steel coil strip into, then be drawn into the welding wire that diameter is 4.0mm, for hot roll built-up welding, draw the hardness of the deposited metal that respective table 1 provides, the crack resistance of deposited metal is high, wearability good.
Table 1 embodiment drug core component and deposited metal performance
In the embodiment of the present invention, being described as follows of various raw materials:
C: be strong austenitizing forming element and reduction Ms point element.In the design of resurfacing welding material, C is most important intensified element, is also to cause crisp element simultaneously.C has the effect of gap solution strengthening, increases the content of C in material, will impel the formation of twin crystal martensite, increases carbide quantity, reduces carbonization material dot spacing, increases post-curing peak value, obtains high hardness.But the increase of C content can make the impact toughness of material decline.
Cr: improve quenching degree, produce solution strengthening, promote the formation of M, in ferrochrome, in the time that Cr content is in 26%, the impact toughness of alloy can increase along with the increase of Cr content, but exceedes 26%, and impact toughness can sharply decline.The post-curing peak temperature of Cr is 500 ℃ of left and right.
V: be strong ferrite former, because itself and carbon, nitrogen, oxygen have strong adhesion, will form the very strong compound of corresponding stability, in steel, V is main post-curing element, and its peak temperature is greatly about 600～625 ℃.A small amount of V can crystal grain thinning, thereby improves intensity and the toughness of steel, but in the time that they are large numbers of, toughness that will damage steel.
W: can increase quenching degree, produce solution strengthening, suppress temper brittleness, appropriate interpolation, is conducive to the raising of impact toughness.The W elements adding, major part is distributed in solid solution, a small amount of carbide that enters into, when tempering time is longer, the Carbide Phases of formation is relatively many.W is one of important element improving the high-temperature stability of steel.
Si: be strong ferrite former, Si, except improving in ferrite and austenite the effect of solution strengthening, also has deoxidation, reduces the oxygen content in weld seam, thereby reduces the detrimental effect of oxygen Resistance of Weld Metal.
Mn: be stable austenite element, reduce Ms point, improve quenching degree.In addition, Mn or good deoxidier and desulfurizing agent, Mn and Si synergy are conducive to reduce the oxygen content in weld seam, be combined with S and form MnS, the FeS that prevents low melting point forms, and prevents from producing in weld metal the tendency of fire check, improves the ability of the heat resistanceheat resistant crackle of weld seam.Mn and iron can form solid solution, improve ferrite and austenitic intensity and hardness in steel, are again weak carbide formers simultaneously, replace the part Fe in cementite, form compound cementite.But excessive Mn content will make the grain coarsening of steel, the ductility of steel is reduced, toughness declines.
The preparation method of medicine core: be that C, Cr, Mo, W, V and Ni are associated to the uniform fritting alloy powder of composition that bronze is the manufacture of aerosolization method, add fluoride and/or carbonate in medicine core simultaneously; Finished product welding wire is through the heat treatment of 300～450 ℃.For improving the distributing homogeneity of alloying element in surfacing layer metal, adopt the aerosolization method in Ferrous Metallurgy, adopting aerosolization method that carbon evanohm, ferromanganese, ferrosilicon, metallic nickel, vanadium iron, ferrotungsten, molybdenum-iron and iron powder in medicine core are connect to ratio adds melt in furnace, atomization to make the uniform single powder of composition, pass through magnetic separation, sieve, close and criticize, check to meet through composition to be again predetermined to be a point requirement, just become the alloy powder that can be used for manufacturing flux-cored wire.
In the present invention, the steel band of flux-cored wire adopts the mild-carbon steel strip that carbon content is less than 0.05%, and the content of wherein controlling impurity element sulphur in steel band is less than 0.008%, and the content of phosphorus is less than 0.015%, and the content of nitrogen is less than 50ppm.The filling rate of medicinal powder is 18%～28%, and the granularity of medicinal powder is 80～200 orders.Steel band is rolled into after U-shaped and adds medicinal powder, seal into O type, and be drawn to finished size, the diameter of finished product welding wire is 3.2mm～5.0mm.
Superiority of the present invention is that surfacing layer metal has high cracking resistance, good wearability and cold & heat fatigue resisting ability, thereby improves the service life of hot roll.
Claims (3)
1. a hot roll built-up welding submerged arc flux-cored wire, is characterized in that drug core component is by weight percentage: 5%～14%CaF
2, 0%～5%Na
2siF
6, 0%～5%BaCO
3, 0.1%～0.4%C, 2.0%～5.5%Mn, 14%～28%Cr, 0.8%～6%Ni, 2%～4.8%Si, 0.6%～4.8%V, 0.8%～7.2%W, 2%～6%Mo, surplus is Fe.
2. the preparation method of the welding wire of claim 1, is characterized in that it is the uniform fritting alloy powder of composition that aerosolization method is manufactured that C, Cr, Mo, W, V and Ni are associated to bronze, adds fluoride and/or carbonate in medicine core simultaneously; Finished product welding wire is through the heat treatment of 300～450 ℃.
3. flux-cored wire as claimed in claim 1, is characterized in that the mild-carbon steel strip that flux-cored wire adopts carbon content to be less than 0.05%; The filling rate of drug core component is 18%～28%,, the granularity of medicinal powder is 80～200 orders; The diameter of finished product welding wire is 3.2mm～5.0mm.
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| US9962748B2 (en) | 2014-06-19 | 2018-05-08 | Nippon Steel & Sumikin Hardfacing Co., Ltd. | Roll for winding equipment in hot rolling factory |
| CN110076478A (en) * | 2019-06-10 | 2019-08-02 | 四川鸿舰重型机械制造有限责任公司 | Rare earth hardfacing materials for blast furnace top bell series of products |
| CN113579548A (en) * | 2021-07-07 | 2021-11-02 | 四川大西洋焊接材料股份有限公司 | Welding rod, preparation method and application thereof and deposited metal |
| CN114101966A (en) * | 2021-11-19 | 2022-03-01 | 济南法瑞钠焊接器材股份有限公司 | Micro-smoke environment-friendly carbon steel flux-cored wire |
| CN114248039A (en) * | 2021-12-20 | 2022-03-29 | 武汉铁锚焊接材料股份有限公司 | High-strength anti-crack metal powder core type submerged arc welding wire for engineering machinery and application |
| CN115922143A (en) * | 2022-12-09 | 2023-04-07 | 山东聚力焊接材料有限公司 | Flux-cored wire for backing BD roller repair and preparation method thereof |
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Application publication date: 20140514 |