CN102825401A - Corrosion-resistant flux-cored welding wire used for gas shielded welding - Google Patents
Corrosion-resistant flux-cored welding wire used for gas shielded welding Download PDFInfo
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Abstract
The invention discloses a corrosion-resistant flux-cored welding wire used for gas shielded welding; the flux-cored welding wire is characterized in that the chemical components and content of the alloy powder in percentage by total weight of the wire are as follows: 0.03%-0.08% of C, 0.3%-0.7% of Si, 1.1%-1.5% of Mn, less than or equal to 0.015% of S, less than or equal to 0.02% of P, 0.2%-0.5% of Cu, 0.4%-0.8% of Cr, 0.2%-0.6% of Ni, 0.03%-0.1% of Ti, 0.02%-0.10% of Sb, and the balance of iron and unavoidable impurity; and meanwhile, the ratio of Cu and Sb elements is controlled to be within the range of 4.0-8.0. The wire deposited metal and the welded have excellent mechanical property, the deposited metal has the tensile strength of more than 550MPa and has the impact toughness of more than 60J at (-40) DEG C. The gas shielded welding wire has the combination property of air-corrosion resistance and sulphuric acid dew point corrosion resistance, and meanwhile, the wire is wide in welding parameter adjustment range, stable in welding process and attractive in the formed welding line, so that the wire is beneficial to the all-position welding.
Description
Technical field
The invention belongs to metal material field, relate to a kind of corrosion-resistant welding material, specifically is a kind of corrosion proof flux cored wire for gas shielded welding that has.
Background technology
In commercial production; Usually the sulphur that contains higher amount in the fuel such as heavy oil or coal contains the various forms oxide of sulphur in the flue gas that these fuel produce in combustion process, they combine to generate sulfurous acid and sulfuric acid with steam in the flue gas; When environment temperature is in below 150 ℃; Dew point appears in the sulfuric acid in the flue gas, produces " corrosion of sulfuric acid at dew point " phenomenon, makes burning and heat-exchange system equipment receive grievous injury.Different with common atmospheric corrosion phenomenon, corrosion of sulfuric acid at dew point not only corrodes the common carbon steel of using, and can corrode stainless steel, very harmful to industrial installation.Therefore; At industrial circles such as electric power, petrochemical industry, tobaccos; With coal or heavy oil is the burning and the heat-exchange system of main fuel, has adopted the steel with resistant to sulfuric acid dew point corrosion characteristic widely like the equipment such as air preheater, economizer, flue, chimney and desulfurizer at intensive oven heat exchanger, boiler low-temperature position.
The popularization of corrosionproof steel against sulfuric acid at dew point and use efficiently solve the caused material of corrosion of sulfuric acid at dew point, corrosion on Equipment problem.Yet in the process that this type steel use, find that the corrosion resistance mismatch problem of steel and welding material is very outstanding.Existing welding material causes welding point because of not possessing the performance of resistant to sulfuric acid dew point corrosion, and especially heavy corrosion very easily appears in the commissure, directly influences welded security and service life.Therefore, it is significant that exploitation has the welding wire of good resistance to sulfuric acid dew point corrosion.Facts have proved, in welding wire, add Ni, Cr, Cu, Mo, Sb, Sn, Se, elements such as w, can obviously improve the decay resistance of welding wire.
" high-intensity railway vehicle is used Weather resistance steel argon-rich gas shielded welding wire " patent that existing corrosion-resistant welding wire proposes like the disclosed Hubei Houwang Welding Material Co., Ltd. of: one Chinese patent application 200810047484.x.Its composition (mass percent) is as follows: C 0.05%~0.10%, Si0.3%~0.5%, Mn 1.2%~1.45%, S≤0.015%, P≤0.015%, Cu0.2%~0.35%, Cr 0.3%~0.7%, Ni 0.2%~0.6%, surplus is iron and unavoidable impurities.
" weather-proof gas protecting welding wire " patent that the disclosed Baoshan Iron and Steel Company of one Chinese patent application numbers 200310108200.0 group proposes.Its composition (mass percent) is as follows: C≤0.1%, Si≤0.6%, Mn 1.2%~1.6%, S≤0.030%, P≤0.030%, Cu 0.1%~0.6%, Cr 0.3%~0.9%; Ni 0.2%~0.6%, Ti 0.03%~0.06%, surplus is an iron.
" the high weather-proof gas shield welding wire of high-intensity high-tenacity " patent that the disclosed wuhan iron & steel croup co. of one Chinese patent application 200410013357.x company proposes, its composition (mass percent) be as follows: C 0.04%~0.12%, Si 0.4%~0.8%, Mn 1.4%~2.0%, S≤0.015%, P≤0.02%, Cu 0.3%~0.5%, Cr 0.2%~0.5%, Ni 0.4%~1.0%, Ti0.06%~0.2%, B 0.002%~0.0079%, ALs≤0.02% surplus are iron and unavoidable impurities.
Above patent is the real core gas shield welding wire of atmospheric corrosion resistance, has added elements such as Cr, Ni, Cu in the welding wire, has certain atmospheric corrosion resistance.But these several kinds of welding wires are for the corrosion of sulfuric acid at dew point poor effect.
Summary of the invention
The object of the present invention is to provide the flux cored wire for gas shielded welding of a kind of resistant to sulfuric acid dew point corrosion, atmospheric corrosion resistance, high tenacity.Mainly be applicable to the gas shield welding of steel grade with resistant to sulfuric acid dew point corrosion and atmospheric corrosion resistance.Can guarantee that gained deposited metal and welding point have excellent corrosion resisting performance, have good comprehensive performances simultaneously, especially low-temperature flexibility is better, and in the time of can reaching-40 ℃, ballistic work is greater than 60J, and yield strength is greater than 450MPa.
The present invention develops a kind of resistant to sulfuric acid dew point corrosion that has, the flux cored wire for gas shielded welding that comprehensive mechanical property is good through the alloying element in the adjustment welding wire.
The objective of the invention is to realize like this, the high tenacity corrosion resistant flux cored wire for gas shielded welding adopts the outer intracutaneous filler alloys powder of steel to process.The percentage that alloying element in the wherein said alloy powder accounts for the welding wire gross mass is: C:0.03%~0.08%, Si:0.3%~0.7%, Mn; 1.1%~1.5%, Cu:0.2%~0.5%, Cr:0.4%~0.8%, Ni:0.2%~0.6%, Ti:0.03%~0.1%; Sb:0.02%~0.10%; S≤0.015%, P≤0.02%, the proportion of controlling the Cu/Sb element simultaneously is between 4.0~8.0.
The composition system characteristics of this welding wire are to have added corrosion-resistant element sb.
Main component design considerations of the present invention is narrated as follows:
C: normal form with carbide exists in steel.See that from the angle of corrosion C content has different influences in different media.In non-oxidizing acid medium, C content increases, and corrosion rate is accelerated.Simultaneously, too high carbon content promotes the formation of high carbon martensite, and the weld metal hardenability is increased, and plasticity reduces, and increases weld metal cold crack sensitiveness.In order to guarantee that weld seam has higher decay resistance and toughness, C content preferable range is between 0.03%~0.08%.
Mn: be main deoxidier, the forming core particle that oxide inclusions that deoxygenation produces and oxygen sulphur duplex impurity can be used as acicular ferrite.Mn content in the weld seam is lower than at 1.1% o'clock, and is insufficient at molten drop and the deoxidation of melt tank reaction stage, and too high oxygen level in the weld seam causes weld strength on the low side.When in the welding wire during Mn too high levels, be prone to segregation, reduce the toughness of weld metal.This welding wire Mn elemental range need be controlled at 1.1%~1.5%.
Si: play the combined deoxidation effect with Mn.The addition of Si is 0.3%~0.7% in the welding wire, and this scope is according to when in the weld seam during Mn/Si ≈ 3, has deoxidation effect preferably, and the transfer coefficient of consideration two kinds of elements in gas shielded arc welding and definite.
Ti: stronger with the adhesion of O, N element, be prone to form TiO, TiO
2And TiN, become the forming core particle of acicular ferrite, promote the formation of acicular ferrite in the austenite crystal, thereby the refinement seam organization improves toughness.When Ti content is lower than 0.03%, its refinement seam organization, the effect that improves toughness is not obvious, and content is higher than at 0.1% o'clock, excessive Ti element can cause the decline of weld metal toughness on the contrary.Simultaneously, the adding of Ti element also can improve the welding procedure property of welding wire.
Cr: increase the antioxidation of weld metal, improve the welding wire corrosion resistance.Its preferable range is 0.5%~0.8%.After content surpassed 0.8%, the low-temperature flexibility of weld metal seriously descended.The corrosion resistance that is lower than 0.4% weld metal can not guarantee.
Ni: can improve the welding wire low-temperature flexibility.Guarantee that weld metal has high toughness when low temperature.Strengthen the corrosion resistance of welding wire simultaneously.Because Ni belongs to precious metal, when Ni content is higher, improve the welding wire production cost.The preferable range of Ni is 0.25%~0.5%.
Cu: improve the effective elements of rotproofness.Under certain condition, the Cu element can promote anodic passivity, thereby reduces corrosion rate, when containing the copper of q.s in the weld seam, in the process of sulfuric acid corrosion, can generate Cu
2The S diaphragm, the reaction of retardance cathode and anode, thereby the decay resistance of raising weld metal, the protective effect that the enrichment of Cu in rusty scale simultaneously also can improve rusty scale.When interpolation Cu was 0.1%~0.5% in the welding wire, its decay resistance is existing obviously to be improved, and after Cu content in the welding wire surpasses 0.5%, the performance of welding wire will worsen.
Sb:,, can form fine and close Cu at face of weld with the Cu acting in conjunction to improving corrosion resistance very effectively
2The Sb film stops the further corrosion of sulfuric acid, improves the resistance to sulfuric acid dew point corrosion of weld metal.When the content ratio of Cu element and Sb element is between 4.0~8.0, the Cu of formation
2Sb film situation is relatively more rational, can improve the corrosion resistance against sulfuric acid of weld metal greatly.When but Sb content is higher, can cause the weldability of welding wire to descend, and the corrosion resistance variation of weld metal in hot environment.
S, P should control in the reasonable scope as impurity element, the P in welding wire>0.02%, and S>0.015% o'clock, the weldability of welding wire and the mechanical property of weld metal and corrosion resisting property all can seriously descend.
The present invention adopts cold-rolled strip to carry out the making of flux-cored wire; The alloy powder granularity of using is 80~100 orders; Alloy powder mixed by certain filling rate when welding wire is rolled down to the U type, add in the welding wire; With of the drawing of this welding wire through 12 passages; End surface shape becomes V-U-O successively, and being made into diameter is the finished product welding wire of 1.6mm, and the drawing welding wire passage is followed successively by: 4.6mm-4.3mm-4.0mm-3.6mm-3.2mm-3.0mm-2.8mm-2.6mm-2.4mm-2. 2mm-2.0mm-1.8mm-1.6mm.
The flux-cored wire indifference is used in flux cored wire for gas shielded welding production process of the present invention and common gases protection weldering.
1, welding wire deposited metal of the present invention and welding point have good mechanical performance deposited metal tensile strength greater than 550MPa, and-40 ℃ of impact flexibility are more than 60J.
2, gas protecting welding wire of the present invention has the combination property of atmospheric corrosion resistance and corrosion resistance to sulfuric acid dew point.
3, welding wire welding parameter area of the present invention adjusting is wide, and welding procedure is stable, and appearance of weld is attractive in appearance, is fit to all-position welding.
The specific embodiment
Below in conjunction with specific embodiment the present invention is elaborated,
Alloying element accounts for the percentage of welding wire gross mass and is in the wherein said alloy powder of welding wire of the present invention: C:0.03%~0.08%, Si:0.3%~0.7%, Mn:1.1%~1.5%, Cu:0.2%~0.5%, Cr:0.4%~0.8%, Ni:0.2%~0.6%, Ti:0.03%~0.1%; Sb:0.02%~0.10%; S≤0.015%, P≤0.02%, the proportion of controlling the Cu/Sb element simultaneously is between 4.0~8.0.Adopt cold-rolled strip to carry out the making of flux-cored wire, thickness of strips 0.9mm, width 10mm.Employed alloy powder granularity is 80~100 orders.Behind the steel band process flux-cored wire mill milling, end surface shape becomes V-U-O successively, alloy powder is mixed by certain filling rate when welding wire is rolled down to the U type, add in the welding wire, finally may be molded to the flux-cored wire of φ 4.6mm.With the drawing of this welding wire through 12 passages, being made into diameter is the finished product welding wire of 1.6mm afterwards, and the drawing welding wire passage is followed successively by: 4.6mm-4.3mm-4.0mm-3.6mm-3.2mm-3.0mm-2.8mm-2.6mm-2.4mm-2. 2mm-2.0mm-1.8mm-1.6mm.
In this embodiment, by different medicine core component proportionings, table 1 is the proportioning table, has carried out the flux-cored wire making.The gross mass of making welding wire is 4kg, and the alloyed powder filling rate is 15% in the welding wire.
Table 1 medicine core component proportioning table
The finished product flux-cored wire that utilization is processed; Carry out the welding of deposited metal test plate (panel) according to GB/T 8110-1995 standard; Weld procedure specification is: welding current: 220~250A, weldingvoltage: 26~27V, speed of welding: 5.6mm/s; Weld heat input is: 10~12kJ/cm, protective gas are 80%Ar+20%CO
2(percent by volume), control interlayer temperature≤150 ℃.Deposited metal composition and mechanical property are seen table 2 and table 3.
Corrosion resistance test adopts the concentrated sulfuric acid to soak corrosion test simulation corrosion of sulfuric acid at dew point entirely, in the sulfuric acid of different temperatures and variable concentrations, has carried out the contrast test of 24h.Welding wire corrosion test sample is the welding point of the steel of anti-the sulphuric acid dew point, and specimen size is 25*25*3.5mm, weld seam in the middle of test plate (panel), 3 on parallel sample, 20 ± 1 ℃ and 70 ± 1 ℃ of test temperatures, the corrosion test solution: mass percent concentration is 20% H
2SO
4With concentration be 50% H
2SO
4(mass percent).Corrosion test result is as shown in table 3.
Table 2 deposited metal is learned composition (Wt%)
Numbering | C | Si | Mn | P | S | Cr | Ni | Cu | Ti | Sb |
Embodiment 1 | 0.035 | 0.42 | 1.03 | 0.0054 | 0.015 | 0.65 | 0.43 | 0.27 | 0.04 | 0.058 |
Embodiment 2 | 0.04 | 0.36 | 1.12 | 0.0053 | 0.013 | 0.42 | 0.21 | 0.29 | 0.05 | 0.060 |
Embodiment 3 | 0.031 | 0.33 | 0.98 | 0.0048 | 0.014 | 0.81 | 0.37 | 0.25 | 0.05 | 0.061 |
Embodiment 4 | 0.042 | 0.35 | 1.05 | 0.0052 | 0.014 | 0.42 | 0.63 | 0.26 | 0.05 | 0.06 |
Embodiment 5 | 0.03 | 0.51 | 1.35 | 0.0050 | 0.012 | 0.47 | 0.22 | 0.52 | 0.065 | 0.06 |
Embodiment 6 | 0.03 | 0.40 | 1.01 | 0.0052 | 0.013 | 0.42 | 0.22 | 0.41 | 0.068 | 0.11 |
Embodiment 7 | 0.038 | 0.32 | 1.02 | 0.0052 | 0.013 | 0.68 | 0.45 | 0.27 | 0.051 | 0.02 |
Embodiment 8 | 0.078 | 0.30 | 0.95 | 0.0051 | 0.012 | 0.65 | 0.42 | 0.31 | 0.04 | 0.069 |
Embodiment 9 | 0.048 | 0.28 | 1.02 | 0.0050 | 0.013 | 0.57 | 0.46 | 0.36 | 0.053 | 0.04 |
Embodiment 10 | 0.03 | 0.44 | 1.28 | 0.0052 | 0.014 | 0.42 | 0.56 | 0.41 | 0.037 | 0.052 |
Embodiment 11 | 0.06 | 0.37 | 1.11 | 0.0053 | 0.013 | 0.52 | 0.61 | 0.21 | 0.028 | 0.072 |
Comparative Examples 1 | 0.04 | 0.45 | 1.11 | 0.0055 | 0.013 | 0.41 | 0.56 | 0.33 | 0.04 | 0.20 |
Comparative Examples 2 | 0.039 | 0.41 | 1.15 | 0.0053 | 0.014 | 0.21 | 0.12 | 0.15 | 0.03 | 0.06 |
Comparative Examples 3 | 0.05 | 0.40 | 1.43 | 0.0055 | 0.011 | 0.34 | 0.71 | 0.38 | 0.08 | -- |
Table 3 welding wire deposited metal mechanical property and corrosion test result
*The impact flexibility data of deposited metal are the mean value of five samples.
By above-mentioned visible: the Sb constituent content in the Comparative Examples 1 outside prescribed limit of the present invention, result, seriously corroded in high-temperature high concentration acid, and low-temperature impact toughness is poor.Cr in the Comparative Examples 2, Ni, Cu constituent content all are lower than prescribed limit of the present invention, do not contain the Sb element in the Comparative Examples 3, and the result has produced serious corrosion under two kinds of experiment conditions.Embodiment 1~embodiment 6 takes all factors into consideration from each side such as mechanical property, corrosion rate and welding wire costs, all than Comparative Examples 1~Comparative Examples 3 remarkable advantages is arranged.Especially the value that differs of the corrosion rate under different condition also is the less of welding wire of the present invention.
Flux-cored wire of the present invention, welding technological properties is good, welding arc stablility, it is little to splash, pore-free, the weld metal moulding is attractive in appearance, and low-temperature impact toughness is good.Can be widely used in the welding of corrosion resistant steel such as chimney, flue, boiler low-temperature parts, flue-cured tobacco case, dust arrester and desulfurization special equipment.
Claims (1)
1. one kind has corrosion proof flux cored wire for gas shielded welding; It is characterized in that; Wherein the chemical composition of alloy powder and content account for the percentage of welding wire gross mass and are: C0.03%~0.08%, Si 0.3%~0.7%, Mn 1.1%~1.5%, S≤0.015%, P≤0.02%, Cu 0.2%~0.5%, Cr 0.4%~0.8%, Ni 0.2%~0.6%, Ti 0.03%~0.1%; Sb0.02%~0.10%; All the other are iron and unavoidable impurities, and the proportion of controlling the Cu/Sb element simultaneously is 4.0~8.0.
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Cited By (5)
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CN104858568A (en) * | 2015-03-31 | 2015-08-26 | 上海焊接器材有限公司 | Gas shielded flux cored welding wire resistant to sulfuric acid dew point corrosion, and preparation method thereof |
CN105937010A (en) * | 2016-06-30 | 2016-09-14 | 江阴兴澄特种钢铁有限公司 | Improved 09CrCuSb steel resistant to sulfuric acid dew point corrosion and manufacturing method thereof |
CN110202290A (en) * | 2019-05-29 | 2019-09-06 | 武汉铁锚焊接材料股份有限公司 | A kind of high-strength weathering steel flux-cored wire and its application |
CN111014882A (en) * | 2019-12-18 | 2020-04-17 | 内蒙古第一机械集团股份有限公司 | Electric arc additive manufacturing method for locking pin body |
CN113770590A (en) * | 2021-10-13 | 2021-12-10 | 浙江强力控股有限公司 | Antimony-containing soldering tin wire free of soldering flux and preparation method thereof |
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CN104858568A (en) * | 2015-03-31 | 2015-08-26 | 上海焊接器材有限公司 | Gas shielded flux cored welding wire resistant to sulfuric acid dew point corrosion, and preparation method thereof |
CN105937010A (en) * | 2016-06-30 | 2016-09-14 | 江阴兴澄特种钢铁有限公司 | Improved 09CrCuSb steel resistant to sulfuric acid dew point corrosion and manufacturing method thereof |
CN105937010B (en) * | 2016-06-30 | 2018-06-19 | 江阴兴澄特种钢铁有限公司 | A kind of modified 09GrCuSb steel for resisting sulfuric acid dew point corrosion and its manufacturing method |
CN110202290A (en) * | 2019-05-29 | 2019-09-06 | 武汉铁锚焊接材料股份有限公司 | A kind of high-strength weathering steel flux-cored wire and its application |
CN111014882A (en) * | 2019-12-18 | 2020-04-17 | 内蒙古第一机械集团股份有限公司 | Electric arc additive manufacturing method for locking pin body |
CN113770590A (en) * | 2021-10-13 | 2021-12-10 | 浙江强力控股有限公司 | Antimony-containing soldering tin wire free of soldering flux and preparation method thereof |
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