CN102922168B - Nickel-based welding rod for welding nickel chromium iron alloy steel - Google Patents
Nickel-based welding rod for welding nickel chromium iron alloy steel Download PDFInfo
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- CN102922168B CN102922168B CN201210426322.3A CN201210426322A CN102922168B CN 102922168 B CN102922168 B CN 102922168B CN 201210426322 A CN201210426322 A CN 201210426322A CN 102922168 B CN102922168 B CN 102922168B
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Abstract
The invention belongs to a nickel-based welding rod for welding nickel chromium iron alloy steel. The nickel-based welding rod comprises a core wire, a coating and an adhesive, wherein the core wire comprises the following components in percentage by weight: 2.5%<=Mn<=4.0%, 15.0%<=Cr<=18.0%, 2.0%<=Fe<=5.0%, 0.4%<=Ti<=1.0%, 1.5%<=Nb<=2.5%, Co<=0.05%, Cu<=0.30%, C<=0.04%, S<=0.010%, P<=0.025%, Si<=0.20%, the balance of Ni; and the coating comprises the following components in percentage by weight: 20 to 35% of rutile powder, 15 to 30% of cryolite, 20 to 35% of marble powder, 3 to 7% of ilmenite powder, 3 to 8% of barium carbonate, 0.5 to 1% of sodium alginate, 0.2 to 0.6% of soda ash, 3 to 6% of electrolytic manganese, and 3 to 6% of ferrocolumbium powder. The nickel-based welding rod for welding nickel chromium iron alloy steel has the advantages that the welding technology capacity is high, weld joints are smooth and bright, the appearance is nice, welding beads are in proper height, and infiltration angles of the weld joints are proper; the deposited metal is high in comprehensive mechanical performance under conditions with common temperature, ultralow temperature and high temperature, and can be applied to the working condition with high radiation; and a welding body can be safely and reliably operated within the working temperature range from -196 DEG C to 980 DEG C.
Description
Technical field
The present invention relates in a kind of welding processing welding rod, particularly a kind of GB/T13814-2008 of meeting and the welding rod heat-resisting, high-temperature corrosion resistance, creep rupture strength require higher resisto steel (UNS NO8800) is welded to being exclusively used in of ENi6133 requirement; The welding body adopting this welding rod to process can in-196 DEG C of ultralow temperature to 980 DEG C operating temperature range safety, reliably use.This welding rod can be used for the different-metal material welding between the austenite of various composition and ferritic stainless steel and Langaloy, as: Inconel (Yin Kangluoyi alloy) and carbon steel, stainless steel, nickel 200, covers your alloy of nickel, the welding of 70-30 corronil; Corronil and nickel 200, cover welding of your alloy of nickel etc.Be particularly useful for welding of welding processing LNG liquid nitrogen storage tank and Yin Kangluoyi 800 and 9% nickel steel.
Background technology
Nickel-base alloy refers to the class alloy having the combination property such as higher intensity and certain antioxidant anticorrosive ability under 650 ~ 1000 DEG C of high temperature.Nickel-base alloy based on nickel, and contains other alloying elements, and has good corrosion resistance in some media.Mainly contain several classes such as nickel, nickel molybdenum (nickel-molybdenum iron) alloy, nickel chromium triangle (ferronickel) alloy, Ni-Cr-Mo, nickel chromium iron.Nickel base superalloy is subdivided into again, abros, nickel-base antiwear alloy, Ni-based Precise Alloy and Ni-based marmem according to main performance.
Along with the development of industry, the application of nickel-base alloy is more and more extensive, the heat exchanger of the various large chemical equipments that the corrosion of acidproof, resistance to oxidation and INCONEL (nichrome) make, nuclear reactor, LNG liquid nitrogen storage tank, reactor pressure vessel force container, the manufacture of vacuum plant and the built-up welding of dissimilar steel, will using nickel welding rod more and more; Thus the demand of Nickel-based Alloy Welding material is increasing.
The domestic producer that can produce the supporting welding rod of nickel-base alloy is few, and most product all establishes one's own system, and coating type has slant acidity and alkalescence.Wherein basic coating type welding rod, based on marble and fluorite, coordinate some other arc stabilizer and improve extrusion material, this coating type welding rod skull is crisp, and diffusible hydrogen content is low, but arc stability is poor, molten bath poor fluidity, it is bad that slag covers uniformity, and de-slag is unclean, residue not easy to clean, appearance of weld out-of-flatness; And slant acidity coating type welding rod notification number be CN101745759B, namely denomination of invention belong to this type of slant acidity covered electrode for " a kind of nickel-base welding rod ", this covering of an electrode adopts rutile-fluorite-ice crystal slant acidity slag system; Although it is better that this type of welding rod has arc stability, slag spreadability and appearance of weld, but it is large to there is skull hardness, de-slag is unclean, face of weld easily leaves residue, not easy to clean, and deposited metal tensile strength at normal temperatures (Rm) after its welding, yield strength (Rp0.2), percentage elongation (A) are lower, the ballistic work (AKV) under-196 DEG C of ultralow temperature and the mechanical property under 820 DEG C of high temperature are all difficult to disadvantages such as meeting the demands.
Summary of the invention
The object of the invention is the defect existed for background technology, research and develop a kind of nichrome steel welding nickel-base welding rod; For the welding of UNS NO8800 nichrome steel, reach and effectively improving on the basis of the mechanical property of weld(ing) deposit under normal temperature, 820 DEG C of high temperature and-196 DEG C of ultralow temperature, when realizing welding, slag fluidity is good, arc stability, slag cover evenly, it is little to splash, the removability of slag is excellent, weld seam light, beautiful appearance, it is moderate that bead height and weld seam infiltrate angle, and the object such as comprehensive good operation performance.
Solution of the present invention is high compared with the fusing point of ferrous alloy for the fusing point of nickel-base alloy, the welding rod of common slant acidity or the trial-production of basic slag system coating recipe is adopted often to occur that arc stability is bad, slag viscosity is large, molten bath mobility is bad, and slag skull covers uneven; Skull is hard, and de-slag is difficult, and residue cleaning is unclean; The shortcoming such as appearance of weld out-of-flatness, surface brightness are bad.The present invention adopts nichrome as core wire, and adopts the compound slag system coating of soda acid.Thus in nichrome steel welding nickel-base welding rod of the present invention, the weight percent content of each chemical composition of core wire is respectively: 2.5≤Mn≤4.0,15.0≤Cr≤18.0,2.0≤Fe≤5.0,0.4≤Ti≤1.0,1.5≤Nb≤2.5, Co≤0.05, Cu≤0.30, C≤0.04, S≤0.010, P≤0.025, Si≤0.20, surplus are Ni; In coating, the weight percent content of each composition is respectively: golden red stone flour 20 ~ 35%, cryolite powder 15 ~ 30%, marble powder 20 ~ 35%, ilmenite powder 3 ~ 7%, brium carbonate 3 ~ 8%, sodium alginate 0.5 ~ 1%, soda ash 0.2 ~ 0.6%, electrolytic manganese 3 ~ 6%, molybdenum-iron powder 3 ~ 6%, ferro-niobium powder 4 ~ 8%, and the total amount of each composition is 100%; The powder of composition each in coating is mixed in proportion rear, to add the heavy 22-28% of total composition binding agent to be uniformly mixed; Then send in plodder and wrapped according to a conventional method on core wire, again through low temperature and high bake temperature; In welding rod, the weight of coating is the 40-50% of core wire weight.
TiO in above-mentioned golden red stone flour
2>=91%, F>=54%, Al>=15%, Na≤29% in cryolite powder, CaCO in marble powder
3content>=96%, FeO+Fe in ilmenite powder
2o
3>=45%, TiO
2>=46%, BaCO in brium carbonate
3>=98.5%, in sodium alginate ash be 20 ~ 30%, Na
2o is 9.5 ~ 13.0%, Na in soda ash
2cO
3>=98.5%, Mn>=99.5% in electrolytic manganese, Mo>=55% in molybdenum-iron powder, Nb>=50%, Si≤2.5%, Al≤2.0%, FeO.20-30% in ferro-niobium powder.And described in add the heavy 22-28% of total composition binding agent be sodium silicate or KP1 or potassium-sodium water glass, its Baume concentration is 41 ° ~ 43 °.The temperature of described soft bake is 80-120 DEG C, and the temperature of high bake temperature is 350-400 DEG C.
After described nichrome steel welding nickel-base welding rod welding, the weight percent content of deposited metal composition is respectively: C≤0.03%, Mn:2.0 ~ 3.0%, Si:0.35 ~ 0.45%, S≤0.015%, P≤0.010%, Cr:14.5 ~ 16.5%, Mo:1.25 ~ 1.85%, Fe:7.0 ~ 10.5%, Cu:0.02 ~ 0.05%, Ti:0.07 ~ 0.10%, Nb:2.0 ~ 2.8%, and surplus is Ni and inevitable impurity.
In coating raw material of the present invention, the Main Function of each composition is as follows:
Rutile: the Main Function of rutile is stable arc, slag making, the physical property such as surface tension, viscosity, mobility of adjustment slag, improves and improves deslag performance, improve appearance of weld, reduces the effects such as splashing; The content of rutile in coating is 20 ~ 35%.
Ice crystal: Main Function is slag making, the physical property of adjustment slag, dehydrogenation and improve usability of electrode energy; The content of ice crystal in coating is 15 ~ 30%.
Marble: Main Function is slag making, gas making, stable arc, improves slag basicity, improves deslag performance, and have good desulphurizing ability and indirect dephosphorization effect, decomposes CO
2protection weld seam, not by oxygen, nitrogenize, reduces the hydrogen content in weld metal; The content of marble in coating is 20 ~ 35%.
Ilmenite: Main Function is slag making, impels molten drop to be vaporific transition, improves speed of welding, is conducive to weld seam and takes off slag and improve appearance of weld, partly can replace rutile, reduce welding rod cost; The content of ilmenite in coating is 3 ~ 7%.
Brium carbonate: Main Function is slag making, gas making, stable arc, adjustment slag physical property, improves the removability of slag and extrusion performance; The content of brium carbonate in coating is 3 ~ 8%.
Sodium alginate: adding sodium alginate is extrusion in order to increase welding rod; Sodium alginate content in coating is 0.5 ~ 1%.
Soda ash: soda ash as lubricant, can add the extrusion that soda ash can increase welding rod in welding rod, also has stabilising arc effect simultaneously; The content of soda ash in coating is 0.2 ~ 0.6%, and addition is crossed and caused the easy moisture absorption of coating at most.
Electrolytic manganese: electrolytic manganese add mainly excessive manganese element in weld seam, improve the intensity of weld metal and plasticity, deoxidization desulfuration can be played simultaneously, accelerate the effect of welding reaction speed; The content of electrolytic manganese in coating is 3 ~ 6%.
Molybdenum-iron: molybdenum mainly plays solution strengthening effect is also carbide former, on the heat resistance of nickel-base alloy and the impact of plasticity best, the solution temperature of γ ' phase can be significantly improved thus improve the serviceability temperature of nickel-base alloy; The all right refinement weld metal crystal grain of molybdenum, prevents crack sensitivity, improves weld metal intensity, impact flexibility and acidproof heat-proof ability; The content of molybdenum-iron in coating is 3 ~ 6%.
Ferro-niobium: niobium can improve the ability of the intensity of weld metal, plasticity and heat-and corrosion-resistant, ferro-niobium add mainly to transition niobium element in weld seam, meet the requirement to the content of niobium, adding of ferro-niobium can also improve welding technological properties; The content of ferro-niobium in coating is 4 ~ 8%.
Namely the present invention is combined coating by the organic of mentioned component and coordinated with nichrome core wire thus realize object of the present invention.
The present invention due to the arc stability adopting soda acid compound slag system coating to coordinate with nichrome core wire both to overcome the welding rod adopting common slant acidity or basic slag system coating to produce and exist bad, slag viscosity is large; The defects such as skull is hard, and de-slag is difficult, surface brightness difference, effectively improve again the mechanical property of welding rod deposited metal at normal temperatures, when particularly using under ultralow temperature, hot conditions.The present invention's slag fluidity when welding is good, arc stability, slag cover evenly, the function admirable of little, the de-slag that splashes; Weld seam light, beautiful appearance, it is moderate that bead height and weld seam infiltrate angle, can carry out direct current reversed polarity, all-position welding and welding performance is excellent; Welding rod deposited metal tensile strength at normal temperatures (Rm) reaches 650MPa, yield strength (Rp0.2) is 380 ~ 390MPa, percentage elongation (A) reaches 42.5 ~ 45.0%; Be on close level with external similar welding rod;-196 DEG C of ultralow temperature ballistic work AKV average out to 115.5J; And 820 DEG C of mechanical behavior under high temperature Rm:215 ~ 260MPa, yield strength (Rp0.2): 285 ~ 305MPa, percentage elongation (A) average out to 20% (in American I NCONEL ENiCrFe-2 820 DEG C of high temperature: Rm=210Mp, A=17%).Thus nickel-base welding rod of the present invention has that welding usability is good, weld seam is bright, beautiful appearance, and it is moderate that bead height and weld seam infiltrate angle; The every mechanical performance index of deposited metal is all excellent, especially the combination property using it good under ultralow temperature, hot conditions is that background technology is incomparable, the welding body of welding rod of the present invention processing in safety in-196 DEG C of ultralow temperature to 980 DEG C operating temperature range, reliably use, can fully can meet in GB/T13814-2008 the requirement to ENiCrFe-2 in ENi6133 and AWS A5.11 (Unite States Standard).
Detailed description of the invention
Embodiment 1:
In the present embodiment, the chemical composition (percentage by weight) of nickel chromium iron core wire is respectively: C:0.013, S:0.002, P:0.003, Si:0.07, Mn:3.07, Cr:16.49, Fe:3.38, Cu:0.017, Ti:0.48, Co:0.019, Nb:1.77, surplus is Ni; The present embodiment is to prepare 250kg core wire coating, and in coating, each Ingredients Weight is as follows: containing TiO
2the golden red stone flour 34kg of 94.6wt%, containing the cryolite powder 24kg of F55wt%, containing CaCO
3the marble powder 20kg of 98.50wt%, containing FeO+Fe
2o
348.80wt%, TiO
2the ilmenite powder 3kg of 47.07wt%, containing BaCO
3the brium carbonate 3kg of 99.3wt%, containing Na
2the sodium alginate 0.5kg of O 12.67wt%, containing Na
2cO
3the soda ash 0.5kg of 99.1wt%, containing the electrolytic manganese 5kg of Mn99.56wt%, containing the molybdenum-iron powder 4kg of Mo57.35wt%, containing the ferro-niobium powder 6kg of Nb55.52wt%; After being mixed by above-mentioned each powder after weighing, to add the potassium-sodium water glass wet-mixing that 25kg concentration (Be ') is 43 °, modulus is 3.1M even, the group of beating is prepared into coating lotion, then sending into is wrapped on core wire in plodder, again through 100 DEG C of soft bake, 2 hours, 380 DEG C high bake temperature 1 hour.
Welding rod (adopting DC reverse connection welding) obtained by the present embodiment carries out welding technological properties experiment, and during welding, slag fluidity is good, arc stability, slag cover evenly, it is little to splash, the removability of slag is excellent; Weld seam light, beautiful appearance, bead height is moderate, and it is moderate that weld seam infiltrates angle, all positon good operation performance; After tested: (welding rod) deposited metal composition is: C:0.024%, Mn:2.03%, Si:0.42%, S:0.010%, P:0.001%, Cr:13.73%, Mo:1.797%, Fe:9.83%, Cu:0.041%, Ti:0.0766%, Nb:2.718%, surplus is Ni and inevitable impurity; Deposited metal mechanical property at normal temperatures: Rm=650Mpa, Rp
0.2=385Mpa, A=45%;-196 DEG C of ultralow temperature ballistic work AKV mean value 113J; High temperature 820 DEG C of mechanical properties: Rm=260Mpa, A=19%.
Embodiment 2:
In the present embodiment, core wire composition is identical with embodiment 1; Still to prepare 250kg core wire coating, in coating, each Ingredients Weight is as follows: golden red stone flour 22kg, cryolite powder 16kg, marble powder 35kg, ilmenite powder 5kg, brium carbonate 6kg, sodium alginate 0.5kg, soda ash 0.5kg, electrolytic manganese 5kg, molybdenum-iron powder 4kg, ferro-niobium powder 6kg; All the other are also identical with embodiment 1.The present embodiment gained welding rod carries out Welding experiment, and its welding usability is identical with embodiment 1; Welding rod deposited metal composition is: C:0.025%, Mn:2.04%, Si:0.38%, S:0.009%, P:0.001%, Cr:14.434%, Mo:1.35%, Fe:8.44%, Cu:0.035%, Ti:0.074%, Nb:2.468%, and surplus is Ni and inevitable impurity; Deposited metal mechanical property at normal temperatures: Rm=645Mpa, Rp
0.2=390Mpa, A=42.5% ,-196 DEG C of ultralow temperature ballistic work AKV mean value 118J; High temperature 820 DEG C of mechanical properties: Rm=215Mp, A=21%.
Above-described embodiment 1,2 Welding experiment, two groups of every mechanical index such as deposited metal ambient temperature mechanical properties ,-196 DEG C of ultralow temperature ballistic works (AKV), 820 DEG C of mechanicals behavior under high temperature are all excellent, can fully meet in GB/T13814-2008 the requirement to ENiCrFe-2 in ENi6133 and AWS A5.11 (Unite States Standard).
Claims (5)
1. a nichrome steel welding nickel-base welding rod, comprise core wire and wrap the coating in core wire surface, it is characterized in that the weight percent content of each chemical composition in core wire is respectively: 2.5≤Mn≤4.0,15.0≤Cr≤18.0,2.0≤Fe≤5.0,0.4≤Ti≤1.0,1.5≤Nb≤2.5, Co≤0.05, Cu≤0.30, C≤0.04, S≤0.010, P≤0.025, Si≤0.20, surplus are Ni; In coating, the weight percent content of each composition is respectively: golden red stone flour 20 ~ 35%, cryolite powder 15 ~ 30%, marble powder 20 ~ 35%, ilmenite powder 3 ~ 7%, brium carbonate 3 ~ 8%, sodium alginate 0.5 ~ 1%, soda ash 0.2 ~ 0.6%, electrolytic manganese 3 ~ 6%, molybdenum-iron powder 3 ~ 6%, ferro-niobium powder 4 ~ 8%, and the total amount of each composition is 100%; The powder of composition each in coating is mixed in proportion rear, to add the heavy 22-28% of total composition binding agent to be uniformly mixed; Then send in plodder and wrapped according to a conventional method on core wire, again through low temperature and high bake temperature; In welding rod, the weight of coating is the 40-50% of core wire weight.
2., by nichrome steel welding nickel-base welding rod described in claim 1, it is characterized in that TiO in described golden red stone flour
2>=91%, F>=54%, Al>=15%, Na≤29% in cryolite powder, CaCO in marble powder
3content>=96%, FeO+Fe in ilmenite powder
2o
3>=45%, TiO
2>=46%, BaCO in brium carbonate
3>=98.5%, in sodium alginate, ash is 2O ~ 30%, Na
2o is 9.5 ~ 13.0%, Na in soda ash
2cO
3>=98.5%, Mn>=99.5% in electrolytic manganese, Mo>=55% in molybdenum-iron powder, Nb>=50%, Si≤2.5%, Al≤2.0%, FeO:20-30% in ferro-niobium powder.
3., by nichrome steel welding nickel-base welding rod described in claim 1, the binding agent adding total composition weight 22-28% described in it is characterized in that is sodium silicate or KP1 or potassium-sodium water glass, and its Baume concentration is 41 ° ~ 43 °.
4., by nichrome steel welding nickel-base welding rod described in claim 1, it is characterized in that the temperature of described soft bake is 80-120 DEG C, the temperature of high bake temperature is 350-400 DEG C.
5. by nichrome steel welding nickel-base welding rod described in claim 1, after it is characterized in that nickel-base welding rod welding, in deposited metal, the weight percent content of each chemical composition is respectively: C≤0.03%, Mn:2.0 ~ 3.0%, Si:0.35 ~ 0.45%, S≤0.015%, P≤0.010%, Cr:13.73 ~ 14.5%, Mo:1.25 ~ 1.85%, Fe:7.0 ~ 10.5%, Cu:0.02 ~ 0.05%, Ti:0.07 ~ 0.10%, Nb:2.0 ~ 2.8%, and surplus is Ni and inevitable impurity.
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| CN201210426322.3A CN102922168B (en) | 2012-10-30 | 2012-10-30 | Nickel-based welding rod for welding nickel chromium iron alloy steel |
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