CN103084758A - Titanium-calcium welding rod - Google Patents
Titanium-calcium welding rod Download PDFInfo
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- CN103084758A CN103084758A CN2013100260907A CN201310026090A CN103084758A CN 103084758 A CN103084758 A CN 103084758A CN 2013100260907 A CN2013100260907 A CN 2013100260907A CN 201310026090 A CN201310026090 A CN 201310026090A CN 103084758 A CN103084758 A CN 103084758A
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Abstract
The invention discloses a titanium-calcium welding rod which comprises a welding core and a coating. The coating comprises, by weight, 6%-25% of dolomite, 2%-8% of fluorite, 30%-45% of rutile, 1%-8% of titanium dioxide, 2%-8% of ferrotitanium, 2%-10% of ferromanganese, 5%-20% of feldspar, 2%-10% of white mud, 2%-7% of chalk, 1%-2% of mica, wherein sum of the weight percentages of all the components is 100%. The welding core comprises, by weight, 0.02%-0.03% of carbon, 1.25%-1.6% of manganese, 0.2%-0.3% of silicon, 20%-23% of chromium, 8.5%-9.5% of nickel, 2.5%-4.0% of molybdenum, 0.15%-0.20% of nitrogen, less than 0.01% of sulfur, less than 0.02% of phosphorus and the rest of ferrum, wherein the sum of the weight percentages of all the components is 100%. After the titanium-calcium welding rod is welded, slag is easy to remove and cover of the slag is uniform.
Description
Technical field
The invention belongs to the materials processing technology field, relate to a kind of lime-titania type electrode, relate in particular to a kind of lime-titania type electrode for welding 2205 two phase stainless steels.
Background technology
2205 two phase stainless steels are a kind of two phase stainless steels that add nitrogen, be called for short 2205 dual phase steels, be the compound stainless steel that is made of 21% chromium, 2.5% molybdenum and 4.5% nickel nitrogen alloy, main alloying element is Cr, Ni, Mo and N, homogeneous corrosion and chlorine stress corrosion fracture that can anti-moderate strength.Also there is no in the market the welding material of specialized hand arc welding 2205 two phase stainless steels, therefore study 2205 two phase stainless steel couplings, improve simultaneously weld seam impact toughness, the welding material that solves postwelding welding seam toughness deficiency is very necessary.
Summary of the invention
The purpose of this invention is to provide a kind of lime-titania type electrode, solved the problem of the welding material that there is no in the market specialized hand arc welding 2205 two phase stainless steels.
The technical solution adopted in the present invention is that lime-titania type electrode comprises core wire and coating, coating is comprised of following material by weight percentage: dolomite 6%～25%, fluorite 2%～8%, rutile 30%～45%, titanium dioxide 1%～8%, ferrotianium 2%～8%, ferromanganese 2%～10%, feldspar 5%～20%, white clay 2%～10%, chalk 2%～7%, mica 1～2%, the percentage by weight sum of above-mentioned each component is 100%; Core wire is composed of the following components by weight percentage: carbon 0.02%～0.03%, manganese 1.25%～1.6%, silicon 0.2%～0.3%, chromium 20%～23%, nickel 8.5%～9.5%, molybdenum 2.5%～4.0%, nitrogen 0.15～0.20%, sulphur＜0.01%, phosphorus＜0.02%, surplus is iron, and the percentage by weight sum of above-mentioned each component is 100%.
The invention has the beneficial effects as follows, lime-titania type electrode of the present invention is the welding material that is exclusively used in manual arc welding 2205 two phase stainless steels, and its stabilising arc is functional, the molten bath good fluidity, the particle that splashes is tiny, and deslag after welding is easy, slag covers evenly, and appearance of weld is careful attractive in appearance.
Description of drawings
Fig. 1 is the deposited metal metallograph of the embodiment of the present invention 1 lime-titania type electrode;
Fig. 2 is the deposited metal metallograph of the embodiment of the present invention 2 lime-titania type electrodes.
The specific embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Lime-titania type electrode of the present invention comprises core wire and coating, and coating is comprised of following material by weight percentage: dolomite 6%～25%, fluorite 2%～8%, rutile 30%～45%, titanium dioxide 1%～8%, ferrotianium 2%～8%, ferromanganese 2%～10%, feldspar 5%～20%, white clay 2%～10%, chalk 2%～7%, mica 1～2%, the percentage by weight sum of above-mentioned each component is 100%; Core wire is composed of the following components by weight percentage: carbon 0.02%～0.03%, manganese 1.25%～1.6%, silicon 0.2%～0.3%, chromium 20%～23%, nickel 8.5%～9.5%, molybdenum 2.5%～4.0%, nitrogen 0.15～0.20%, sulphur＜0.01%, phosphorus＜0.02%, surplus is iron, and the percentage by weight sum of above-mentioned each component is 100%.
Lime-titania type electrode of the present invention is the welding material that is exclusively used in manual arc welding 2205 two phase stainless steels, and its stabilising arc is functional, the molten bath good fluidity, and the particle that splashes is tiny, and deslag after welding is easy, and slag covers evenly, and appearance of weld is careful attractive in appearance.
The preparation method of above-mentioned lime-titania type electrode, concrete steps are as follows:
step 1, core wire is composed of the following components by weight percentage: carbon 0.02%～0.03%, manganese 1.25%～1.6%, silicon 0.2%～0.3%, chromium 20%～23%, nickel 8.5%～9.5%, molybdenum 2.5%～4.0%, nitrogen 0.15～0.20%, sulphur＜0.01%, phosphorus＜0.02%, surplus are iron, and the percentage by weight sum of above-mentioned each component is 100%, at first be professional pure iron and the ingot iron of 1:1 with weight ratio, contain C, Si, Mo, Cr, the ore of N and nickel powder are together put into induction furnace and are smelted all to dissolve to material and form the alloy molten steel and its temperature reaches 1540 ℃, stopped heating when the alloy molten steel is tranquil, add heat refining 15～25min after coolant exhaust 10～20min, 5min is filled with argon gas and a small amount of nitrogen before the steel alloy liquid temp drops to 1540 ℃, make the induction furnace internal gas pressure reach 250～350mmHg, tap after adding in the alloy molten steel again Mn to stir 2min when the steel alloy liquid temp is 1540 ℃, evenly pour into a mould after the surperficial calmness of alloy molten steel, be cooled to room temperature and obtain steel ingot,
square billet will be forged into after ingot scalping, be cooled to remove square billet surface casting skin and crackle after room temperature and cut and begin to crop up, then with milling train, billet rolling being become diameter is mechanical descaling after the 6.5mm wire rod, be to adopt the chain-type drying oven 145～155 ℃ of oven dry after salt pickling 10～20min of 15% with volumetric concentration in the acid-resisting concrete pickling tube again, drying rate is 1.5～2.5m/s, carry out batching after dry wire drawing with the swinging wire drawing machine, use swinging wire drawing machine dry wire drawing again after naturally cooling to room temperature after the welding wire that batches is heated to 670～680 ℃, be wound in the welding wire that diameter is 4.0mm, it is core wire,
Step 2, take respectively dolomite 6%～25% according to percentage by weight, fluorite 2%～8%, rutile 30%～45%, titanium dioxide 1%～8%, ferrotianium 2%～8%, ferromanganese 2%～10%, feldspar 5%～20%, white clay 2%～10%, chalk 2%～7%, mica 1～2%, the percentage by weight sum of above-mentioned each component is 100%, above-mentioned coating material and sodium silicate is put into batch mixer together mix 10～20min take weight ratio as 3～3.5:1, then mixed medicinal powder is put into balling press and is pressed into cylindrical medicine group;
Step 3, the cylindrical medicine group that adds in electrode extrusion press that step 2 makes, and cylindrical medicine is rolled into a ball extrusion on the core wire that step 1 makes, then put into first 60 ℃ of low temperature baking 8h of batch-type furnace, then carry out hyperthermia drying with 120 ℃, 180 ℃, 250 ℃ and 350 ℃ of four temperature sections respectively, the drying time of each temperature section is 1h, namely obtains lime-titania type electrode.
The effect of each component in coating:
Dolomite: the main composition of dolomite is CaMg (CO
3)
2, play the effect of carbonate in electrode coating, its effect is mainly gas making and slag making, and it also produces certain impact to the stabilising arc performance in addition, and desulfurization and the dephosphorization of the oxidation product CaO Resistance of Weld Metal that it is main have very large effect; It also plays the effect of magnesium salts to dolomite in electrode coating, and is more favourable than simple calcium salt to the plasticity and toughness that improve weld seam, and can improve greatly the gas permeability of slag, has namely improved the ability of anti-pore.
Fluorite: the Main Function of fluorite is slag making and falls hydrogen, used comparatively widely in electrode coating.In the more slag of CaO, it can improve the performance of slag, reduces fusing point and changes and viscosity, increases the mobility of slag, makes the gas in weld seam be easy to overflow; Be combined into HF with hydrogen and volatilize, desulfurization and minimizing white point tendency.
Rutile: the main component of rutile is TiO
2, it is good slag former, is also fabulous plastic-viscous admixture, can make slag become short slag, is conducive to improve the welding technological properties of welding rod.
Titanium dioxide: titanium dioxide can make coating have good plasticity, improve welding rod extrusion processing performance, when the ratio of titanium dioxide and rutile remains on the 3.5:1 left and right, basically can obtain and learn from other's strong points to offset one's weaknesses, replace rutile with the partial-titanium white powder simultaneously, can also increase the coating of electrode coating.Titanium dioxide is also good slag former and plastic-viscous admixture simultaneously, can make slag become short slag, is conducive to improve the welding technological properties of welding rod.
Ferroalloy: ferroalloy comprises ferrotianium and ferromanganese at electrode coating of the present invention.Ferrotianium is main deoxidier, and can protect manganese few oxidated and be transitioned into molten bath, the product TiO after deoxidation
2Stronger shoddye effect is arranged.And ferrotianium is favourable to the welding technological properties that improves welding rod.Emit a large amount of heat energy during the manganese oxidation, improve bath temperature, be conducive to metallurgical reaction.
Silicate: the effect of silicate in the welding rod slag can not be despised, and the feldspar that adds in electrode coating of the present invention, white clay, chalk and mica all belong to silicate.Its oxidation product SiO
2In order to slag making, and can adjust the viscosity of slag, improve the extrusion performance of welding rod, and its addition also produces certain impact to the basicity of welding rod.Mixing and add feldspar, white clay, chalk, and directly do not add quartz sand, is because be the composite silica hydrochlorate at these silicate, removes SiO
2Effect, contain simultaneously Al
2O
3, Fe
2O
3, K
2O, Na
2The oxides such as O, these oxides can be played a positive role in the welding rod slag equally, as Al
2O
3Add the viscosity that can improve lime-titania type slag of the present invention, improve the centrality of electric arc, and increase the surface tension of slag, make welding rod to take off slag easier; K and for example
2O and Na
2O can make electric arc easily ignite, and impels arc stability burning, can reduce the fusion temperature of slag simultaneously, increases capillary difference between slag and weld metal, makes that skull is easier to come off from face of weld.
Mica: the Main Function of mica is extrusion performance and the slag making that improves coating, and helps to improve arc-stabilising, but has owing to containing the crystallization water, can make weld metal increase hydrogen.Mica has following characteristic: 1) corrosion resistance: mica and common acids aqueous slkali Fails To Respond, also do not react with water, thereby not aliquation, do not hang dirt, do not break, under washing away in long-term (2～3 years) of high-temperature high pressure water, still can substantially keep original clear and transparency; 2) hot property: because synthetic mica does not contain (OH)
-So its high temperature heat-resistant stability is more much higher than natural mica, synthetic mica just slowly decomposes more than 1200 ℃, and is significantly weightless more than 1100 ℃; 3) vacuum deflation performance: the vacuum deflation amount of synthetic mica is low, measures with mass spectrograph, and the minimum gas of emitting is O
2, N
2With adsorbed gases such as Ar.Owing to not emitting H
2O steam is well suited for will greatly improving the service life of vacuum device as the electrovacuum insulating materials; 4) water content of synthetic mica is less, is conducive to reduce hydrogen blistering, thereby is conducive to guarantee the intensity of weld seam.
The effect of each component in core wire:
Carbon: carbon is strong austenite former.Due to the carbide intercrystalline precipitation, make the weld metal embrittlement, the phenomenon of the poor chromium of crystal boundary appears.The weld metal corrosion resistance is reduced, and the invigoration effect of grain boundary carbide can make weld metal intensity and wearability increase, therefore take corrosion resistance as main stainless steel weld joint, phosphorus content is lower for well; And the stainless steel weld joint that requirement has elevated temperature strength, its phosphorus content should be suitable.Determine that based on above reason the present invention the composition range of C in core wire is 0.02%～0.04%.
Manganese: manganese is the austenitizing forming element.When not changing austenite+ferritic structure state, can improve the crack resistance of weld seam, increase the plasticity of weld seam.But when the manganese too high levels, just can cause the austenite alligatoring of weld seam, just can cause this moment weld seam anti intercrystalline corrosion ability to reduce.The present invention determines that the content of manganese in core wire is 1.2%～1.5%.
Silicon: silicon is the ferrite forming element, and it can increase the intensity of weld seam; In austenite+ferritic dual phase steel, low-temperature impact toughness is reduced, but but can effectively increase the cracking resistance of austenite+ferrite diphasic stainless steel weld seam.In oxidizing acid, silicon can increase the weld seam decay resistance; And under the prerequisite of the ferritic phase alligatoring that does not make weld seam, can increase weld seam anti intercrystalline corrosion ability.Therefore in core wire, the content of silicon is controlled at 0.2%～0.4%.
Chromium: chromium is the ferrite forming element, can increase yield strength and the ultimate strength of weld seam, and reduces percentage elongation and the contraction percentage of area, reduces sometimes impact flexibility; And chromium can improve weld seam anti intercrystalline corrosion ability, improves the corrosion resistance of two phase stainless steel weld seam in oxidizing acid.So in core wire, the scope control of network is 21%～22.5%.
Nickel and nitrogen: nickel is the austenitizing forming element.In the situation that do not make weld seam fire check occur, can increase the plasticity of weld seam.When nickel content causes in weld seam the alligatoring of austenite phase, just can reduce weld seam anti intercrystalline corrosion ability, but be increased in the corrosion resistance of weld seam in reductive acid.Nitrogen is the same with nickel has important impact aspect the formation austenite, and they are all to form and enlarge austenitic element.But the ability of nitrogen is far longer than nickel.At high temperature, the energy force rate nickel of nitrogen stable austenite is large.Can prevent that single-phase ferrite from appearring in postwelding, and can stop separating out of poisonous metal phase.In order to suppress ferritic excessive increase in weld seam, adopting the dominant weld metal of austenite is the welding trend of two phase stainless steel.Improve nickel or add these two approach of nitrogen in the general welding material that adopts.Usually the content of nickel exceeds 2%～4% than mother metal, so the content of the nickel that the present invention determines in core wire is 8%～10%.Improve the packing material better effects if of nickel with nitrogenous packing material than only, two kinds of elements can increase austenitic ratio, and make it stable, can not only delay separating out of intermetallic phase but add nitrogen, but also can improve intensity and the corrosion resistance of weld metal.The content of the determined nitrogen of the present invention in core wire is 0.15%～0.20%.
Molybdenum: molybdenum is the ferrite forming element, can improve stainless steel weld joint elevated temperature strength and crack resistance.Molybdenum content and present 2%～3% time particularly in reductive acid, can improve the weld seam decay resistance apparent in viewly, and can obviously improve the pitting corrosion resistant performance of weld metal in all kinds of acid.Therefore the composition of the determined molybdenum of the present invention is 2.5%～3.5%.
Sulphur and phosphorus: sulphur, phosphorus are impurity element.Sulphur increases the hot cracking tendency of weld seam, and in weld seam, content is more low better.In weld seam, ferritic phase is more, and the illeffects of phosphorus is more weak, and at this moment, phosphorus can not cause producing fire check.Sulphur and phosphorus belong to restricted impurity element, but reduce the content of sulphur and phosphorus unlimitedly, will inevitably cause the raising of production cost, are sulphur＜0.01% therefore control the content of sulphur, phosphorus, phosphorus＜0.02%.
Embodiment 1
step 1, at first be professional pure iron and the ingot iron of 1:1 with mass ratio, contain C, Si, Mo, Cr, the ore of N and nickel powder are together put into induction furnace and are smelted, treat that material all dissolves formation alloy molten steel and its temperature reaches 1540 ℃, stopped heating when the alloy molten steel is tranquil, add heat refining 20min after coolant exhaust 15min, 5min is filled with argon gas and a small amount of nitrogen before the steel alloy liquid temp drops to 1540 ℃, make the induction furnace internal gas pressure reach 250mmHg, tap after adding in the alloy molten steel again Mn to stir 2min when the steel alloy liquid temp is 1540 ℃, evenly pour into a mould after the surperficial calmness of alloy molten steel, be cooled to room temperature and obtain steel ingot,
square billet will be forged into after ingot scalping, be cooled to remove square billet surface casting skin and crackle after room temperature and cut and begin to crop up, then with milling train, billet rolling being become diameter is mechanical descaling after the 6.5mm wire rod, be to adopt the chain-type drying oven 150 ℃ of oven dry after 15% salt pickling 10min with volumetric concentration in the acid-resisting concrete pickling tube again, drying rate is 2.5m/s, carry out batching after dry wire drawing with the swinging wire drawing machine, use swinging wire drawing machine dry wire drawing again after naturally cooling to room temperature after the welding wire that batches is heated to 670 ℃, be wound in the welding wire that diameter is 4.0mm, it is core wire,
Step 2 takes respectively dolomite 6g, fluorite 3.4g, rutile 45g, titanium dioxide 1g, ferrotianium 4.4g, ferromanganese 8.4g, feldspar 20g, white clay 6.8g, chalk 3g, mica 2g, put into batch mixer mixing 10min with above-mentioned coating material with together with the 30g sodium silicate, then mixed medicinal powder is put into balling press and be pressed into cylindrical medicine group;
Step 3, the cylindrical medicine group that adds in electrode extrusion press that step 2 makes, and cylindrical medicine is rolled into a ball extrusion on the core wire that step 1 makes, then put into first 60 ℃ of low temperature baking 8h of batch-type furnace, then carry out hyperthermia drying with 120 ℃, 180 ℃, 250 ℃ and 350 ℃ of four temperature sections respectively, the drying time of each temperature section is 1h, namely obtains lime-titania type electrode.
Mechanical property and the processing performance of table 1 welding rod deposited metal
Fig. 1 is seen in the deposited metal metallographic structure, as seen from the figure, tissue is mainly ferrite and is the austenite that dendroid is separated out from ferrite intracrystalline or crystal boundary, organizes more even, such duplex structure to guarantee every mechanical property and the corrosion resistance of two phase stainless steel.
Embodiment 2
step 1, at first be professional pure iron and the ingot iron of 1:1 with mass ratio, contain C, Si, Mo, Cr, the ore of N and nickel powder are together put into induction furnace and are smelted, treat that material all dissolves formation alloy molten steel and its temperature reaches 1540 ℃, stopped heating when the alloy molten steel is tranquil, add heat refining 15min after coolant exhaust 10min, 5min is filled with argon gas and a small amount of nitrogen before the steel alloy liquid temp drops to 1540 ℃, make the stove internal gas pressure reach 350mmHg, tap after adding in the alloy molten steel again Mn to stir 2min when the steel alloy liquid temp is 1540 ℃, evenly pour into a mould after the surperficial calmness of alloy molten steel, be cooled to room temperature and obtain steel ingot,
square billet will be forged into after ingot scalping, be cooled to remove square billet surface casting skin and crackle after room temperature and cut and begin to crop up, then with milling train, billet rolling being become diameter is mechanical descaling after the 6.5mm wire rod, be to adopt the chain-type drying oven 145 ℃ of oven dry after 15% salt pickling 15min with volumetric concentration in the acid-resisting concrete pickling tube again, drying rate is 2m/s, carry out batching after dry wire drawing with the swinging wire drawing machine, use swinging wire drawing machine dry wire drawing again after naturally cooling to room temperature after the welding wire that batches is heated to 675 ℃, be wound in the welding wire that diameter is 4.0mm, it is core wire,
Step 2 takes respectively dolomite 16g, fluorite 3g, rutile 42g, titanium dioxide 3.2g, ferrotianium 3.8g, ferromanganese 3.6g, feldspar 17g, white clay 8.4g, chalk 2g, mica 1g, put into batch mixer mixing 15min with above-mentioned coating material with together with the 33g sodium silicate, then mixed medicinal powder is put into balling press and be pressed into cylindrical medicine group;
Step 3, the cylindrical medicine group that adds in electrode extrusion press that step 2 makes, and cylindrical medicine is rolled into a ball extrusion on the core wire that step 1 makes, then put into first 60 ℃ of low temperature baking 8h of batch-type furnace, then carry out hyperthermia drying with 120 ℃, 180 ℃, 250 ℃ and 350 ℃ of four temperature sections respectively, the drying time of each temperature section is 1h, namely obtains lime-titania type electrode.
Mechanical property and the processing performance of table 2 welding rod deposited metal
Embodiment 3
step 1, at first be professional pure iron and the ingot iron of 1:1 with mass ratio, contain C, Si, Mo, Cr, the ore of N and nickel powder are together put into induction furnace and are smelted, treat that material all dissolves formation alloy molten steel and its temperature reaches 1540 ℃, stopped heating when the alloy molten steel is tranquil, add heat refining 25min after coolant exhaust 20min, 5min is filled with argon gas and a small amount of nitrogen before the steel alloy liquid temp drops to 1540 ℃, make the induction furnace internal gas pressure reach 300mmHg, tap after adding in the alloy molten steel again Mn to stir 2min when the steel alloy liquid temp is 1540 ℃, evenly pour into a mould after the surperficial calmness of alloy molten steel, be cooled to room temperature and obtain steel ingot,
square billet will be forged into after ingot scalping, be cooled to remove square billet surface casting skin and crackle after room temperature and cut and begin to crop up, then with milling train, billet rolling being become diameter is mechanical descaling after the 6.5mm wire rod, be to adopt the chain-type drying oven 150 ℃ of oven dry after 15% salt pickling 20min with volumetric concentration in the acid-resisting concrete pickling tube again, drying rate is 2.0m/s, carry out batching after dry wire drawing with the swinging wire drawing machine, use swinging wire drawing machine dry wire drawing again after naturally cooling to room temperature after the welding wire that batches is heated to 680 ℃, be wound in the welding wire that diameter is 4.0mm, it is core wire,
Step 2 takes respectively dolomite 20g, fluorite 2g, rutile 45g, titanium dioxide 4.4g, ferrotianium 3.6g, ferromanganese 4.8g, feldspar 12g, white clay 4.2g, chalk 2.5g, mica 1.5g, put into batch mixer mixing 20min with above-mentioned coating material with together with the 29g sodium silicate, then mixed medicinal powder is put into balling press and be pressed into cylindrical medicine group;
Step 3, the cylindrical medicine group that adds in electrode extrusion press that step 2 makes, and cylindrical medicine is rolled into a ball extrusion on the core wire that step 1 makes, then put into first 60 ℃ of low temperature baking 8h of batch-type furnace, then carry out hyperthermia drying with 120 ℃, 180 ℃, 250 ℃ and 350 ℃ of four temperature sections respectively, the drying time of each temperature section is 1h, namely obtains lime-titania type electrode.
Mechanical property and the processing performance of table 3 welding rod deposited metal
Embodiment 4
step 1, at first be professional pure iron and the ingot iron of 1:1 with mass ratio, contain C, Si, Mo, Cr, the ore of N and nickel powder are together put into induction furnace and are smelted, treat that material all dissolves formation alloy molten steel and its temperature reaches 1540 ℃, stopped heating when the alloy molten steel is tranquil, add heat refining 20min after coolant exhaust 15min, 5min is filled with argon gas and a small amount of nitrogen before the steel alloy liquid temp drops to 1540 ℃, make the induction furnace internal gas pressure reach 300mmHg, tap after adding in the alloy molten steel again Mn to stir 2min when the steel alloy liquid temp is 1540 ℃, evenly pour into a mould after the surperficial calmness of alloy molten steel, be cooled to room temperature and obtain steel ingot,
square billet will be forged into after ingot scalping, be cooled to remove square billet surface casting skin and crackle after room temperature and cut and begin to crop up, then with milling train, billet rolling being become diameter is mechanical descaling after the 6.5mm wire rod, be to adopt the chain-type drying oven 148 ℃ of oven dry after 15% salt pickling 15min with volumetric concentration in the acid-resisting concrete pickling tube again, drying rate is 1.5m/s, carry out batching after dry wire drawing with the swinging wire drawing machine, use swinging wire drawing machine dry wire drawing again after naturally cooling to room temperature after the welding wire that batches is heated to 670 ℃, be wound in the welding wire that diameter is 4.0mm, it is core wire,
Step 2 takes respectively dolomite 15g, fluorite 8g, rutile 40g, titanium dioxide 2g, ferrotianium 5g, ferromanganese 8g, feldspar 15g, white clay 2g, chalk 4g, mica 1g, put into batch mixer mixing 10min with above-mentioned coating material with together with the 31g sodium silicate, then mixed medicinal powder is put into balling press and be pressed into cylindrical medicine group;
Step 3, the cylindrical medicine group that adds in electrode extrusion press that step 2 makes, and cylindrical medicine is rolled into a ball extrusion on the core wire that step 1 makes, then put into first 60 ℃ of low temperature baking 8h of batch-type furnace, then carry out hyperthermia drying with 120 ℃, 180 ℃, 250 ℃ and 350 ℃ of four temperature sections respectively, the drying time of each temperature section is 1h, namely obtains lime-titania type electrode.
Mechanical property and the processing performance of table 4 welding rod deposited metal
Embodiment 5
step 1, at first be professional pure iron and the ingot iron of 1:1 with mass ratio, contain C, Si, Mo, Cr, the ore of N and nickel powder are together put into induction furnace and are smelted, treat that material all dissolves formation alloy molten steel and its temperature reaches 1540 ℃, stopped heating when the alloy molten steel is tranquil, add heat refining 25min after coolant exhaust 10min, 5min is filled with argon gas and a small amount of nitrogen before the steel alloy liquid temp drops to 1540 ℃, make the induction furnace internal gas pressure reach 250mmHg, tap after adding in the alloy molten steel again Mn to stir 2min when the steel alloy liquid temp is 1540 ℃, evenly pour into a mould after the surperficial calmness of alloy molten steel, be cooled to room temperature and obtain steel ingot,
square billet will be forged into after ingot scalping, be cooled to remove square billet surface casting skin and crackle after room temperature and cut and begin to crop up, then with milling train, billet rolling being become diameter is mechanical descaling after the 6.5mm wire rod, be to adopt the chain-type drying oven 145 ℃ of oven dry after 15% salt pickling 10min with volumetric concentration in the acid-resisting concrete pickling tube again, drying rate is 1.5m/s, carry out batching after dry wire drawing with the swinging wire drawing machine, use swinging wire drawing machine dry wire drawing again after naturally cooling to room temperature after the welding wire that batches is heated to 680 ℃, be wound in the welding wire that diameter is 4.0mm, it is core wire,
Step 2 takes respectively dolomite 10g, fluorite 5.4g, rutile 35g, titanium dioxide 7.6g, ferrotianium 8g, ferromanganese 10g, feldspar 5g, white clay 10g, chalk 7g, mica 2g, put into batch mixer mixing 20min with above-mentioned coating material with together with the 30g sodium silicate, then mixed medicinal powder is put into balling press and be pressed into cylindrical medicine group;
Step 3, the cylindrical medicine group that adds in electrode extrusion press that step 2 makes, and cylindrical medicine is rolled into a ball extrusion on the core wire that step 1 makes, then put into first 60 ℃ of low temperature baking 8h of batch-type furnace, then carry out hyperthermia drying with 120 ℃, 180 ℃, 250 ℃ and 350 ℃ of four temperature sections respectively, the drying time of each temperature section is 1h, namely obtains lime-titania type electrode.
Mechanical property and the processing performance of table 5 welding rod deposited metal
Fig. 2 is seen in the deposited metal metallographic structure, as seen from the figure, tissue is mainly ferrite and is the austenite that dendroid is separated out from ferrite intracrystalline or crystal boundary, organizes more even, such duplex structure to guarantee every mechanical property and the corrosion resistance of two phase stainless steel.
Embodiment 6
step 1, at first be professional pure iron and the ingot iron of 1:1 with mass ratio, contain C, Si, Mo, Cr, the ore of N and nickel powder are together put into induction furnace and are smelted, treat that material all dissolves formation alloy molten steel and its temperature reaches 1540 ℃, stopped heating when the alloy molten steel is tranquil, add heat refining 15min after coolant exhaust 20min, 5min is filled with argon gas and a small amount of nitrogen before the steel alloy liquid temp drops to 1540 ℃, make the induction furnace internal gas pressure reach 350mmHg, tap after adding in the alloy molten steel again Mn to stir 2min when the steel alloy liquid temp is 1540 ℃, evenly pour into a mould after the surperficial calmness of alloy molten steel, be cooled to room temperature and obtain steel ingot,
square billet will be forged into after ingot scalping, be cooled to remove square billet surface casting skin and crackle after room temperature and cut and begin to crop up, then with milling train, billet rolling being become diameter is mechanical descaling after the 6.5mm wire rod, be to adopt the chain-type drying oven 148 ℃ of oven dry after 15% salt pickling 20min with volumetric concentration in the acid-resisting concrete pickling tube again, drying rate is 2.5m/s, carry out batching after dry wire drawing with the swinging wire drawing machine, use swinging wire drawing machine dry wire drawing again after naturally cooling to room temperature after the welding wire that batches is heated to 675 ℃, be wound in the welding wire that diameter is 4.0mm, it is core wire,
Step 2 takes respectively dolomite 25g, fluorite 6.5g, rutile 30g, titanium dioxide 8g, ferrotianium 2g, ferromanganese 2g, feldspar 15g, white clay 5g, chalk 5g, mica 1.5g, put into batch mixer mixing 15min with above-mentioned coating material with together with the 32g sodium silicate, then mixed medicinal powder is put into balling press and be pressed into cylindrical medicine group;
Step 3, the cylindrical medicine group that adds in electrode extrusion press that step 2 makes, and cylindrical medicine is rolled into a ball extrusion on the core wire that step 1 makes, then put into first 60 ℃ of low temperature baking 8h of batch-type furnace, then carry out hyperthermia drying with 120 ℃, 180 ℃, 250 ℃ and 350 ℃ of four temperature sections respectively, the drying time of each temperature section is 1h, namely obtains lime-titania type electrode.
Mechanical property and the processing performance of table 6 welding rod deposited metal
Claims (1)
1. lime-titania type electrode, is characterized in that, comprises core wire and coating, described coating is comprised of following material by weight percentage: dolomite 6%～25%, fluorite 2%～8%, rutile 30%～45%, titanium dioxide 1%～8%, ferrotianium 2%～8%, ferromanganese 2%～10%, feldspar 5%～20%, white clay 2%～10%, chalk 2%～7%, mica 1～2%, the percentage by weight sum of above-mentioned each component is 100%; Described core wire is composed of the following components by weight percentage: carbon 0.02%～0.03%, manganese 1.25%～1.6%, silicon 0.2%～0.3%, chromium 20%～23%, nickel 8.5%～9.5%, molybdenum 2.5%～4.0%, nitrogen 0.15～0.20%, sulphur＜0.01%, phosphorus＜0.02%, surplus is iron, and the percentage by weight sum of above-mentioned each component is 100%.
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| CN106825985A (en) * | 2015-12-07 | 2017-06-13 | 海宁瑞奥金属科技有限公司 | Phase stainless steel use welding rod |
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| CN106825985A (en) * | 2015-12-07 | 2017-06-13 | 海宁瑞奥金属科技有限公司 | Phase stainless steel use welding rod |
| CN110605502A (en) * | 2019-09-18 | 2019-12-24 | 中国电建集团上海能源装备有限公司 | Titanium-calcium slag system double-phase stainless steel welding rod and preparation thereof |
| CN110773906A (en) * | 2019-11-22 | 2020-02-11 | 株洲湘江电焊条有限公司 | Stainless steel welding rod and preparation method thereof |
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