CN1654160A - Niobium-titanium-boron microalloy high-strength gas protecting welding wire - Google Patents
Niobium-titanium-boron microalloy high-strength gas protecting welding wire Download PDFInfo
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- CN1654160A CN1654160A CN 200510060033 CN200510060033A CN1654160A CN 1654160 A CN1654160 A CN 1654160A CN 200510060033 CN200510060033 CN 200510060033 CN 200510060033 A CN200510060033 A CN 200510060033A CN 1654160 A CN1654160 A CN 1654160A
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Abstract
The gas protected Nb-Ti-B micro alloy weld filament contains C 0.04-0.15 wt%, Mn 1.00-2.00 wt%, Si 0.30-1.20 wt%, Ni 0.60-1.80 wt%, Ti 0.08-0.20 wt%, Mo 0.10-0.80 wt%, Nb 0.01-0.05 wt%, B 0.002-0.012 wt%, S not more than 0.10 wt% and P not more than 0.20 wt%, except Fe and inevitable impurity. Under the protection of mixed gas of Ar and CO2 and proper welding technological parameter and interlayer temperature, the weld seam metal can reach tensile strength over 800 MPa and impact power at -30 deg.c higher than 100 J. When used in multilayer welding, the weld seam metal has excellent structure and performance homogeneity, and the weld filament has excellent technological performance. The present invention may be used widely for welding low alloy high strength steel in engineering machinery, railway bridge, marine facility, high pressure container, etc.
Description
Technical field
The present invention relates to a kind of niobium-titanium-boron microalloy high-strength gas protecting welding wire.This welding wire adopts M21 mist (80%Ar+20%CO
2) when welding protection, welding wire process is functional, have welding arc stablility, splash little, moulding is attractive in appearance, be adapted to advantage such as all-position welding.Simultaneously, suitably controlling under welding condition and the interlayer temperature condition yield strength 〉=690MPa of weld metal, tensile strength 〉=800MPa ,-30 ℃ of ballistic work A
Kv〉=100J is applicable to the gas shielded arc welding of 800MPa level low alloy high-strength structural steel.
Background technology
At present in the design and manufacturing process of naval vessel, ocean, engineering machinery, the important large welded structures of petroleum pipeline; in order to alleviate deadweight, cut down the consumption of energy, to improve the life-span; the structural steel and iron that has progressively adopted high strength and high tenacity to have both is to the also increase day by day of demand of corresponding supporting gas protecting welding wire.But the kind of gas protecting welding wire is single, up to now, does not still have ripe 800MPa level commercialization gas protecting welding wire.Japan Patent P2000-218391A discloses a kind of gas protecting welding wire, and the weld metal of this welding wire has good low-temperature impact toughness, can not reach 800MPa but weak point is a tensile strength.The ST800 mixed gas arc welding silk that ESAB company produces, though deposited metal tensile strength has reached 800MPa, weak point is that its impact flexibility can not satisfy the instructions for use of structure under low temperature is on active service.A kind of gas protecting welding wire of domestic-developed, the intensity of corresponding weld metal and toughness all can with 800MPa grade steel plate coupling, but because of added in the welding wire a large amount of nickel (〉=3.85wt%), cost is higher.
Summary of the invention
The purpose of this invention is to provide a kind of weld structure performance evenly, tensile strength 〉=800Mpa, low-temperature impact toughness height, welding technological properties is good, production cost is relatively low, be widely used in the gas protecting welding wire of respective strengths rank low-alloy high-strength steel important structure multilayer welding.
For achieving the above object; the present invention proposes a kind of gas protecting welding wire of deposited metal intensity high and low temperature good toughness, it is characterized in that adopting chemical analysis design (wt%): C 0.04～0.15, Mn 1.00～2.00, Si 0.30～1.20, Ni0.60～1.80, Ti 0.08～0.20, Mo 0.10～0.80, Nb 0.01～0.05, B0.002～0.012, S≤0.10, P≤0.20, the surplus of niobium-titanium-boron microalloyization and welding wire in weld seam is Fe and unavoidable impurities element.
Make weld metal tensile strength reach 〉=800MPa the time, obtain good low-temperature impact toughness again, key is the seam organization that forms based on high density dislocation fine acicular ferrite.For this reason, the present invention has added an amount of niobium, boron and other alloying element in welding wire, and when these alloying elements carried out the transition in the weld seam, the mechanism of action of butt welded seam tissue and performance was:
Trace B NONEQUILIBRIUM SEGREGATION in the weld seam continuous cooling process with suppressing the forming core of pro-eutectoid ferrite, enlarges the zone that acicular ferrite changes on austenite grain boundary; Nb, B be compound to be added fashionablely, obviously reduces the initial transition temperature of acicular ferrite, to improve the dislocation density of acicular ferrite.In addition, and the Nb that between lath, forms (C, molecule nail N) is mixed and can effectively hinder the alligatoring of lath on the lath border, makes when multilayer welding, and the tissue and the property retention of weld metal are uniform and stable.
Oxidation and nitrogenize for preventing B have added Ti in welding wire.In droplet transfer and melt tank reaction stage, form oxide inclusions or the oxygen sulphur complex inclusion of Ti, Si, Mn, Al etc.Wherein the part field trash is at high temperature grown up, and separates and enters in the slag, and part is stayed in the weld seam because of cooling off fast.Cross when being as cold as the acicular ferrite transition region when austenite, field trash brings out acicular ferrite at the intracrystalline forming core.By contrast, the oxide of Ti has the effect of the stronger heterogeneous forming core of promotion intracrystalline.
Therefore, when Nb, Ti, B unite add fashionable, there is reciprocation between the three, at certain suitable matching range, be about in the welding wire that Ti content is controlled at 0.08～0.20%, B content is controlled at 0.002～0.012%,, Nb content was controlled at 0.01～0.05% o'clock, can in weld seam, create to help obtaining the ferritic dynamic conditions of a large amount of high density dislocation fine aciculars.
Also added other alloying elements such as C, Mn, Si, Ni, Mo in the welding wire, its adding scope and effect are:
C content in the welding wire is controlled at 0.05～0.15%.Add suitable C in the welding wire, main effect is to guarantee that weld metal has certain quenching degree.Its secondary role is the second phase particle that forms Nb, Ti etc.In addition, certain carbon content also helps to improve droplet transfer characteristic and arc stability.But too much C can make the weld metal hardenability increase, and plasticity reduces, and crack sensitivity increases.
Si content in the welding wire is controlled at 0.20～1.00.In gas protecting welding wire, Si is one of main deoxidation and intensified element, and when the content of Si in the welding wire was lower than 0.20%, deoxidation was insufficient, made too high oxygen level in the weld seam; When in the weld seam during Si too high levels, can make the weld metal sclerosis, spatter increases, and the welding wire process performance descends.
Mn content in the welding wire is controlled in 1.00～2.00.Mn and Si play the combined deoxidation effect, when in the weld seam during Mn/Si ≈ 3, have deoxidation effect preferably.When Mn content is lower than 1.00 in the welding wire, insufficient at molten drop and the deoxidation of melt tank reaction stage, make too high oxygen level in the weld seam, and make weld strength on the low side.When in the welding wire during Mn too high levels, easily cause the segregation of Mn, easily produce the M-A island structure at the manganese segregated zone, reduce the plasticity of weld metal, the low-temperature impact toughness of weld metal obviously descends.
Ni content in the welding wire is controlled at 0.60～1.80.Ni obviously improves the toughness of weld metal, and especially its low-temperature impact toughness reduces brittle transition temperature.Ni plays important invigoration effect in weld metal simultaneously.Therefore, the Ni content in the welding wire should not be lower than 0.60, but Ni belongs to noble element, should not add.
Mo content in the welding wire is controlled at 0.10～0.80.An amount of Mo and B unite and add fashionablely, can suppress pro-eutectoid ferrite and change, and the promotion overcooling austenite is in the transformation of middle warm area.Weld metal plasticity descends, cold crack sensitiveness increases but too high Mo content can cause.
S, P element butt welded seam metal low-temperature flexibility have damaging effect, should reduce as far as possible.Require S≤0.10, P≤0.20 in the welding wire.
In a word, the present invention is by carrying out rational chemical analysis design to gas protecting welding wire, and the butt welded seam metal has carried out suitable Nb, Ti, B microalloying, has obtained acicular ferrite a large amount of, that have high density dislocation thereby stablize in weld seam; The Nb that forms between lath (C, mix on the lath border, can effectively hinder the alligatoring of lath by molecule nail N).Add an amount of Si, Mn in the welding wire, ferrite matrix in the strengthen welds, and butt welded seam carries out combined deoxidation, makes the oxygen content in the weld seam moderate.Add an amount of Ni in the welding wire, with the intensity and the low-temperature impact toughness of further raising weld metal.Welding wire adds an amount of Mo, to promote the middle temperature transformation of overcooling austenite; Reasonably the wire composition design makes weld metal have suitable alloy system, and finally makes weld seam have excellent obdurability coupling.Welding wire of the present invention has following advantage:
1. adopt mist (80%Ar+20%CO
2) during shielded arc welding, under control suitable welding condition and interlayer temperature condition, the tensile strength of weld metal reaches 〉=800MPa ,-30 ℃ of ballistic work A
Kv〉=100J, and during multilayer welding, the weld metal performance is uniform and stable.Can be widely used in the welding of large-scale important structure 800MPa level low alloy high-strength steel such as engineering machinery, railroad bridge, marine facility, high-pressure bottle, oil-gas pipeline.
2. this welding wire adopts M21 mist (80%Ar+20%CO
2) when welding protection, welding wire process is functional, and welding arc stablility, little, the pore-free of splashing, moulding be attractive in appearance, be adapted to all-position welding.
3. the used alloy system of welding wire of the present invention is suitable, and the smelting of its wire rod, drawing, copper facing rolling and welding wire realize that easily production cost is lower.
The specific embodiment
With embodiment welding wire of the present invention is described in further detail below:
Embodiment: select low S, P raw scrap material for use, adopt 0.2 ton of electric furnace to carry out welding wire steel and smelt.Note gas content and alloy addition sequence in the control steel in the smelting process.The chemical analysis of welding wire steel is (wt%): C 0.065, Mn 1.82, Si 0.58, S 0.0062, P 0.014, Ni1.42, Ti 0.18, Mo 0.32, B 0.0078, Nb 0.024.After the smelting welding wire steel is processed into the welding wire that specification is Φ 1.2mm through operations such as rolling, drawing, copper coatings.
Welding wire of the present invention adopts mist (80%Ar+20%CO
2) protect and carry out the welding of deposited metal test plate (panel), immediately the mechanical property of deposited metal and the processing performance of welding wire are evaluated.Welding conditions are: welding current 230～270A, weldingvoltage 23～25, speed of welding 21.5cm/min, gas flow 18L/min, weld heat input 17.2KJ/cm.Welding thickness of slab 18mm, 45 ° of bevel angles, band 10mm backing plate, root gap is 16mm.The mechanical property of deposited metal is: σ
s=696MPa, σ
b=824MPa, δ
5=17%, ψ=63%, deposited metal series of temperatures ballistic work A
KvBe respectively 152J (20 ℃), 134J (20 ℃), 125J (30 ℃), 102J (40 ℃).
Welding wire adopts mist (80%Ar+20%CO
2) protection, carry out engineering machinery and check with steel HQ620DB downhand welding butt joint.HQ620DB steel plate chemical analysis is (wt%): C 0.055, Si 0.267, Mn 1.482, P 0.010, S 0.003, Nb 0.045, Ni 0.304, Mo 0.156, Cu0.538, Ti 0.021, the steel plate tensile strength sigma
bBe 775MPa.Welding conditions are: welding current 220～240A, weldingvoltage 22～24V, speed of welding 20～22cm/min, average weld heat input 17.3KJ/cm.Welding thickness of slab 20mm, 75 ° of bevel angles, root face 1mm, root do not stay the gap.The chemical analysis of weld metal is (wt%): C 0.048, Si 0.46, Mn 1.62, P0.012, S 0.004, Ni 1.22, Mo 0.24, Ti 0.044, Nb 0.023, B 0.0074.Adapter plate draws the assay reflection joint 16mm place outside weld seam of breaking, weld metal series of temperatures ballistic work A
KvBe respectively 157J (0 ℃), 138J (30 ℃), 132J (40 ℃), 121J (50 ℃).Welding point clod wash d=3a, 180 ° are intact.
Claims (2)
1. niobium-titanium-boron microalloy high-strength gas protecting welding wire; it is characterized in that: the chemical analysis of welding wire is (wt%): C 0.04～0.15, Mn 1.00～2.00, Si 0.30～1.20, Ni 0.60～1.80, Ti 0.08～0.20, Mo 0.10～0.80, Nb 0.01～0.05, B 0.002～0.012, S≤0.10, P≤0.20, and surplus is Fe and unavoidable impurities element.
2. niobium-titanium-boron microalloy high-strength gas protecting welding wire according to claim 1; it is characterized in that: the chemical analysis of welding wire is (wt%): C 0.065, Mn 1.82, Si 0.58, S 0.0062, P 0.014, Ni 1.42, Ti 0.18, Mo 0.32, B 0.0078, Nb 0.024, and surplus is Fe and unavoidable impurities element.
Priority Applications (1)
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| CNB2005100600336A CN1321777C (en) | 2005-03-25 | 2005-03-25 | Niobium-titanium-boron microalloy high-strength gas protecting welding wire |
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| CNB2005100600336A CN1321777C (en) | 2005-03-25 | 2005-03-25 | Niobium-titanium-boron microalloy high-strength gas protecting welding wire |
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| CN1654160A true CN1654160A (en) | 2005-08-17 |
| CN1321777C CN1321777C (en) | 2007-06-20 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100425387C (en) * | 2006-10-31 | 2008-10-15 | 山东大学 | Method for producing welding materials by using offcut of steel plate |
| CN102528318A (en) * | 2010-12-17 | 2012-07-04 | 鞍钢股份有限公司 | Gas-shielded welding wire for nuclear power |
| CN103341686A (en) * | 2013-06-09 | 2013-10-09 | 武汉钢铁(集团)公司 | Submerged-arc welding method of high-intensity steel thick plate for nuclear power |
| CN106514038A (en) * | 2015-09-14 | 2017-03-22 | 江苏立新焊接材料有限公司 | Gas shielded welding wire for submarine pipeline welding and production method of gas shielded welding wire |
| CN106514037A (en) * | 2015-09-14 | 2017-03-22 | 江苏立新焊接材料有限公司 | Gas-shielded wire for submarine pipeline welding and production method of gas-shielded wire |
| CN107931840A (en) * | 2017-11-22 | 2018-04-20 | 宝鸡文理学院 | A kind of titanium nickel dissimilar welded joint induced with laser monotectic and uniform grain Reaction Welding method |
| CN108857141A (en) * | 2018-08-07 | 2018-11-23 | 鞍钢股份有限公司 | 620MPa grade gas protection welding wire capable of eliminating stress |
| CN112496595A (en) * | 2020-12-29 | 2021-03-16 | 中国电建集团上海能源装备有限公司 | Gas shielded welding wire for nuclear power containment vessel and preparation and application thereof |
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| CN101456102B (en) * | 2009-01-05 | 2011-05-04 | 西安理工大学 | Alpha titanium alloy manual tungsten-electrode argon-shielded tungsten arc welding refined grain type welding wire and preparation method thereof |
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| JP2822462B2 (en) * | 1989-07-20 | 1998-11-11 | 大同特殊鋼株式会社 | Gas shielded arc welding wire |
| TW574380B (en) * | 2000-10-06 | 2004-02-01 | Jfe Steel Corp | Submerged-arc welding point with large heat input, method for producing the welding point, steel solder wire used by the method, and solder flux |
| JP3891039B2 (en) * | 2002-05-27 | 2007-03-07 | Ｊｆｅスチール株式会社 | High heat input electroslag welding wire |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100425387C (en) * | 2006-10-31 | 2008-10-15 | 山东大学 | Method for producing welding materials by using offcut of steel plate |
| CN102528318A (en) * | 2010-12-17 | 2012-07-04 | 鞍钢股份有限公司 | Gas-shielded welding wire for nuclear power |
| CN103341686A (en) * | 2013-06-09 | 2013-10-09 | 武汉钢铁(集团)公司 | Submerged-arc welding method of high-intensity steel thick plate for nuclear power |
| CN103341686B (en) * | 2013-06-09 | 2016-01-20 | 武汉钢铁(集团)公司 | A kind of high-strength nuclear power steel thick plate buried arc welding method |
| CN106514038A (en) * | 2015-09-14 | 2017-03-22 | 江苏立新焊接材料有限公司 | Gas shielded welding wire for submarine pipeline welding and production method of gas shielded welding wire |
| CN106514037A (en) * | 2015-09-14 | 2017-03-22 | 江苏立新焊接材料有限公司 | Gas-shielded wire for submarine pipeline welding and production method of gas-shielded wire |
| CN107931840A (en) * | 2017-11-22 | 2018-04-20 | 宝鸡文理学院 | A kind of titanium nickel dissimilar welded joint induced with laser monotectic and uniform grain Reaction Welding method |
| CN107931840B (en) * | 2017-11-22 | 2020-04-28 | 宝鸡文理学院 | Laser-induced monotectic and homogeneous reaction welding method for titanium-nickel heterojunction |
| CN108857141A (en) * | 2018-08-07 | 2018-11-23 | 鞍钢股份有限公司 | 620MPa grade gas protection welding wire capable of eliminating stress |
| CN112496595A (en) * | 2020-12-29 | 2021-03-16 | 中国电建集团上海能源装备有限公司 | Gas shielded welding wire for nuclear power containment vessel and preparation and application thereof |
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|---|---|
| CN1321777C (en) | 2007-06-20 |
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