CN103042321B - Metal powder-cored type nitrogen austenite stainless steel flux-cored wire - Google Patents
Metal powder-cored type nitrogen austenite stainless steel flux-cored wire Download PDFInfo
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- CN103042321B CN103042321B CN201210563503.0A CN201210563503A CN103042321B CN 103042321 B CN103042321 B CN 103042321B CN 201210563503 A CN201210563503 A CN 201210563503A CN 103042321 B CN103042321 B CN 103042321B
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Abstract
The invention relates to a metal powder-cored type nitrogen austenite stainless steel flux-cored wire and a method for manufacturing the same. The metal powder-cored type nitrogen austenite stainless steel flux-cored wire comprise a carbon steel cored shell and powder filled in the shell, and is characterized in that the powder comprises, by weight, from 35% to 45% of metal chromium, from 15% to 25% of nickel powder, from 3% to 6% of ferrochromium nitride, from 10% to 15% of silicon-magnesium alloy, from 2% to 8% of molybdenum powder, from 0.5% to 2.5% of ferrotitanium powder, from 0.5% to 1% of potassium carbonate arc stabilizers, from 0.5% to 1% of aluminum-magnesium powder, from 0.5% to 1% of bismuth oxide, from 0.3% to 0.5% of sodium oxide, from 0.01% to 0.1% of rare-earth cerium and from 1% to 10% of iron powder, and the weight of the powder ranges from 40% to 50% of the total weight of the wire. Compared with the prior art, the metal powder-cored type nitrogen austenite stainless steel flux-cored wire has the advantages that weld metal has excellent mechanical properties such as good toughness and high strength after the wire is applied to welding high-nitrogen steel, and a corrosion resistant effect is good.
Description
Technical field
The present invention relates to stainless steel welding material technical field, specifically refer to a kind of metal powder core pattern austenitic stainless steel flux-cored wire.
Background technology
Stainless welding method generally has SMAW, gas tungsten arc welding, submerged-arc welding etc.Stainless flux-cored wire welding is a stainless steel welded revolution, and the development and application of stainless flux-cored wire accelerates the carrying out of this revolution.Stainless flux-cored wire active gas shielded arc welding and carbon steel CO
2weld identical, semi-automatic have efficiency characteristic high, simple to operate with during automatic welding.Therefore be used widely in boats and ships, bridge, pressure vessel, field of petrochemical industry.
At present, on market, flux-cored wire is all have slag type welding wire substantially, is in drug core component, add a certain amount of slag former, is generally divided into acid slag, basic slag and neutral slag.And metal powder type flux-cored wire does not add slag making thing, thus improve deposition efficiency.This kind of flux-cored wire is existing development to a certain degree abroad, but the domestic research about this kind of flux-cored wire is less, in the low-alloy steel flux-cored wire standard GB/T 17493-2008 of new revision, by included for low-alloy steel metal powder type flux-cored wire, visible metal powder type flux-cored wire more and more pay attention to by China.
And stainless steel market rises and falls very large in recent years, main by nickel with chromium is raw-material affects.On raw material, China is the country of the few chromium of a scarce nickel, and especially nickel mainly relies on import, adds that steel grade that China produces is based on austenitic stainless steel, and cost and price affects larger by international nickel market.Therefore, we need resources for research economizing type stainless steel-high nitrogen steel more.
High-nitrogen austenitic stainless steel and high nitrogen steel are a kind of resource-conserving stainless steels of high-strength and high ductility, and its N element mass content is generally greater than 0.4%, utilize N element to replace alloying element Ni as austenite stable element to obtain austenite structure.And the adding of N, under the prerequisite that toughness is not lost, effectively raise the intensity of steel, improve the N content of austenitic stainless steel, the yield strength of steel can improve nearly 2 times.Therefore, high nitrogen steel has good obdurability and corrosion resistance, and still has high intensity and toughness when this steel has paramagnetism feature and low temperature (4K) and be engaged in cryogenic engineering field and be also with a wide range of applications.Therefore the development and application of high nitrogen steel also more and more receives the concern of scholars.
High nitrogen steel (HNS) material system is with existing different by other steel grade system, the nitrogenous height of high nitrogen steel causes its weldability to have the advantages that to be different from other medium carbon low alloy steel, the most essential problem of high nitrogen steel welding avoids the loss of nitrogen, ensure the nitrogen content of deposited metal, nitrogen discharge can cause mechanical property, shock resistance and decay resistance to decline.In welding process, welding rod, welding wire jointly melt with groove mother metal, form deposited metal under the effect of electric arc thermal source, and produce complicated physical-chemical reaction, solidify formation weld seam, deposited metal composition, particularly nitrogen element content and welding material closely related, need the special welding material of the complicated materializing procedure in applicable high nitrogen steel molten bath, ensure to obtain the property of welded joint matched with mother metal performance.
Welding material is the basis that high nitrogen steel structure material manufactures, it is the core realizing advanced arc welding method, ensure Weld Performance, it is the technical bottleneck that high nitrogen Steel material manufactures, only have and break through high nitrogen welding material composition and technology of preparing, form perfect high nitrogen steel solder technology system, high its combination property advantage of nitrogen Steel material competence exertion.
Summary of the invention
Technical problem to be solved by this invention provides that a kind of strength of welded joint is high, shock resistance good and the metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire that welding quality stable, cost are low for the present situation of prior art.
Second technical problem to be solved by this invention is to provide that a kind of strength of welded joint is high, shock resistance good and the preparation method of the metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire that welding quality stable, cost are low.
The present invention solves the problems of the technologies described above adopted technical scheme: this metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire, the medicinal powder comprising carbon steel cored housing and be filled in described housing, is characterized in that the weight percent of described medicinal powder is composed as follows:
The weight of described medicinal powder is 40 ~ 50% of this welding wire gross weight.
Preferably, described housing can be mild steel, and C≤0.050% in this mild steel, Mn≤0.200%, Si≤0.010%, S≤0.010%, P≤0.020%.
In preferred described nitrided ferro-chromium, the weight content of nitrogen is 10%, and the weight content of chromium is 60%; In described silicomangan, the content of silicon is 20%, and the content of manganese is 60%; In described titanium-iron powder, the weight content of titanium is 25-30%; In described al-mg powder, the content of aluminium, magnesium is respectively 50%.
The thickness of described housing is 0.3 ~ 0.7mm, and width is 8 ~ 12mm.
The preparation method of above-mentioned metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire, is characterized in that comprising the steps:
1) weigh each component in described medicinal powder according to formula, and each component is spiked into is mixed together evenly;
2) described mild steel steel band is pressed into the uncovered shape with hopper by forming machine;
3) load in described hopper by the medicinal powder after mixing, filling rate is 40 ~ 50%; Then by the uncovered docking of hopper or lap seal, described medicinal powder is sealed in mild steel housing;
4) roll becomes diameter to be the metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire of 1.0 ~ 4.0mm.
Metal powder type nitrogen austenite flux-cored wire provided by the present invention, the hafnium metal powfer in medicine core is as the transition elements material in weld metal during welding, and chromium powder can improve pitting corrosion resistant performance, ensure that the corrosion resistance of weld metal and the intensity of welding.
Nickel powder described above is also as transition alloy elements in a kind of weld metal, is a kind of metallic element of stable generation austenitic microstructure, can strengthens corrosion resistance and the toughness of weld metal.If the amount added is too low, then toughness is not enough, easily produces brittle crack; If the amount added is too high, then formed austenite divides digit rate can be excessive, thus makes intensity be tending towards reducing, and can affect the weld metal performance after welding.Simultaneously because it expands austenitic area element, the height of its content also affects the content of solid solution nitrogen in weld metal.
Molybdenum powder can play the intensity increasing substantially weld metal under the prerequisite of the corrosion resistance ensureing weld metal; Meanwhile, it coordinates with other component in the present invention and has good synergy, can better ensure the high strength of weld metal.The addition of molybdenum is too low, and the corrosion resistance of weld metal and intensity are all inadequate, and weld seam nitrogen fixation effect is poor; Addition is too high, can make to produce intermetallic compound in weld metal structure, thus toughness is reduced, and adds the fragility of weld metal.The present invention by the plenty of time the consumption of molybdenum selected can either ensure the corrosion resistance of weld metal have the weld metal that can obtain high strength.
Silicomangan plays the effect of deoxidier and alloying constituent, and it is combined with oxygen and plays deoxidation in molten bath, and on the other hand to weld metal transition manganese and element silicon, (feeling that this sentence is not very clear and coherent) provides excellent mechanical property to weld seam.Silicon can close austenitic area, is unfavorable for the solid solution of nitrogen element; And manganese can expand austenitic area element, suitable content is beneficial to the solid solution of nitrogen element.
Ferrotianium and al-mg powder mainly play the effect of precedent desoxydation, to avoid the generation of the defects such as pore.And titanium is a kind of strong ferrite former, if the amount added is too high, ferrite area can be expanded, reduce austenitic area, cause weld metal not undergo phase transition in cooling procedure, also can not produce Grain Refinement Effect, thus greatly reduce the plasticity of weld metal, cause the fragility of weld metal.The present invention, through the determined amount ranges of lot of experiments, can act synergistically with other element, solve the problems referred to above well, simultaneously the plasticity of weld metal and toughness also better.Magnesium elements then plays the effect improving low-temperature impact toughness.
Potassium class arc stabilizer and sodium oxide molybdena mainly play stabilising arc effect, and suitable consumption can improve arc burning stability, reduce and splash, then can worsen technique during too high levels.
Bismuth oxide can crystal grain thinning, improves low-temperature impact toughness, with C, Si, Mn, Ti add simultaneously fashionable have improve impact flexibility effect significantly, and welding pool surface tension can be improved, improve the shaping of weld seam.
Rare-earth element cerium plays the effect of purification crystal boundary, crystal grain thinning, is of value to and eliminates solidification cracking, the mechanical strength improving weld metal and toughness.
The material of carbon steel crust of the present invention is mild steel, and described thickness of strips is 0.3 ~ 0.7mm, and width is 8 ~ 12mm, the percentage by weight that composition in described mild steel accounts for mild steel is: C≤0.050%, Mn≤0.200%, Si≤0.010%, S≤0.010%, P≤0.020%.Above-mentioned mild steel steel band is selected more to be conducive to actual production operation, equally can be more effective in conjunction with medicine core of the present invention, make the flux-cored wire quality made better.
In sum, 1, metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire provided by the present invention, each composition consumption proportion in medicine core is reasonable, between each component, synergistic action effect is good, particularly can the appropriate nitrogen of transition in weld metal by medicinal powder, flux-cored wire has good toughness, the high preferably mechanical property of intensity for the weld metal after welding high nitrogen steel, and corrosion resistance effect is better.
2, a kind of metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire provided by the present invention, there is no the required a large amount of slag making things added of common stainless steel flux-cored wire, improve deposition efficiency, have during for welding high nitrogen Steel material that deposition rate is fast and flue dust is less, splash little, appearance of weld is good, the advantage that welding stability is higher, has good welding procedure adaptability.
3, the present invention adopts quality carbon steel steel band by powder such as core such as medicine such as parcel chromium, nickel etc., adopts full rolling mill practice to make, raw material and low cost of manufacture, is applicable to industrialized mass production, remarkable in economical benefits.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
One, metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire is prepared
1, take each powder of preparation medicine core by table 1 formula, each component all crosses 80 mesh standard sieves, and is mixed by the powder taken, for subsequent use;
2, mild steel steel band is pressed into channel-shaped structure by forming machine; Following each embodiment all selects the trade mark to be the mild steel steel band of SYHS, and the thick 0.3mm of steel band, wide 8.25mm, in steel band, each constituent content is C≤0.050%, Mn≤0.200%, Si≤0.010%, S≤0.010%, P≤0.020%, Fe surplus.
3, loaded by the spice after mixing in groove that steel band suppresses, the percentage that filling rate and powder weight account for welding wire weight is 40 ~ 50%; Then the opening of groove is sealed in the mode of docking or overlap joint, powder dense is enclosed in mild steel housing;
4, diameter is become by the steel band roll that sealing is loaded with medicine core powder to be the metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire of 1.0 ~ 4.0mm.
Each component proportion and filling rate in table 1 embodiment 1 to embodiment 6
Two, welding wire performance test
Weld respectively with the flux-cored wire that embodiment 1 ~ 6 is obtained, in carbon dioxide rich argon protection atmosphere, carry out (80%Ar+20%CO
2) downhand position welding, welding conditions are as shown in table 2.
Table 2 welding conditions
| Specification (mm) | Welding current (A) | Weldingvoltage (V) | Gas flow L/min | Speed of welding cm/min |
| φ1.6 | 220～260 | 26～30 | 15～20 | 22～26 |
1, welding procedure
In welding process, welding wire is sent to stable, arc stability, and molten drop is tiny, and can carry out spray transfer, splash little, flue dust is less, and appearance of weld is attractive in appearance.
2, weld metal mechanical property test and weld seam nitrogen analysis
Adopt carbon dioxide or rich argon (80%Ar+20%CO
2) gas shield; test plate (panel) bevel 35 °; size 12 × 150 × 300mm, downhand position is welded, and produces the welding wire weld seam Metal Mechanic Property sample of embodiment 1 ~ 6 with reference to GB/T17853-1999 " stainless flux-cored wire " national standard and carries out mechanical test (see table 3).
Nitrogen content in table 3 each embodiment weld metal mechanical property and weld metal
As shown in Table 3, the flux-cored wire welding that embodiment 1 ~ 6 is obtained obtains the equal > 0.2% of the content of nitrogen in weld seam.
3, slit type cracking test
Slit type cracking test is carried out to the weld seam after the welding wire welding using embodiment 1 ~ 6 to prepare, is 0 through inspection face of weld cracking breakout, section crack rate and root crack rate.
4, deposition efficiency measures
Deposition efficiency=(M
1-M
0)/M
Wherein, M
1for the test plate (panel) welded removes the weight after the foreign material such as splashing, oxidation slag crust; M
0for welding front test plate (panel) weight; M is the welding wire weight that welding consumes
Deposition rate through recording the obtained flux-cored wire of embodiment 1 ~ 6 is respectively 94%, 95%, 93%, 93%, 91%, 92%.
Claims (4)
1. a metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire, the medicinal powder comprising carbon steel cored housing and be filled in described housing, is characterized in that the weight percent of described medicinal powder is composed as follows:
The weight of described medicinal powder is 40 ~ 50% of this welding wire gross weight.
2. metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire according to claim 1, is characterized in that described housing is mild steel, and C≤0.050% in this mild steel, Mn≤0.200%, Si≤0.010%, S≤0.010%, P≤0.020%.
3. metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire according to claim 1 and 2, is characterized in that the weight content of nitrogen in described nitrided ferro-chromium is 10%, and the weight content of chromium is 60%; In described silicomangan, the content of silicon is 20%, and the content of manganese is 60%; In described titanium-iron powder, the weight content of titanium is 25-30%; In described al-mg powder, the content of aluminium, magnesium is respectively 50%.
4. metal powder core pattern nitrogenous austenitic stainless steel flux-cored wire according to claim 3, it is characterized in that the thickness of described housing is 0.3 ~ 0.7mm, width is 8 ~ 12mm.
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| CN201210563503.0A CN103042321B (en) | 2012-12-21 | 2012-12-21 | Metal powder-cored type nitrogen austenite stainless steel flux-cored wire |
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| KR100774155B1 (en) * | 2006-10-20 | 2007-11-07 | 고려용접봉 주식회사 | Flux cored wire for duplex stainless steel and the manufacturing method thereof |
| CN100515655C (en) * | 2007-08-09 | 2009-07-22 | 武汉铁锚焊接材料股份有限公司 | Low alloy steel flux-cored welding wire for carbon dioxide gas protection welding |
| CN100513612C (en) * | 2007-09-28 | 2009-07-15 | 王新虎 | Self-lubricating wear-resisting overlaying alloy |
| CN100467190C (en) * | 2007-10-11 | 2009-03-11 | 北京工业大学 | Full-position soldering biphase stainless steel flux-cored wire |
| CN102284806A (en) * | 2011-08-24 | 2011-12-21 | 北京工业大学 | High-boron iron-based wear-resistant flux-cored welding wire |
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