CN1328897A - Microtitanium-boron high-toughness gas protective welding stick - Google Patents
Microtitanium-boron high-toughness gas protective welding stick Download PDFInfo
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- CN1328897A CN1328897A CN 01128326 CN01128326A CN1328897A CN 1328897 A CN1328897 A CN 1328897A CN 01128326 CN01128326 CN 01128326 CN 01128326 A CN01128326 A CN 01128326A CN 1328897 A CN1328897 A CN 1328897A
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Abstract
The present invention relates to a micro titanium-boron high-toughness gas shielded welding wire, its chemical components (wt.%) are: C 0.03-0.10, Mn 1.00-1.80, Si 0.20-1.00, Ni 0.50-1.40, Ti 0.10-0.20, B 0.002-0.010, S less than or equal to 0.10, P less than or equal to 0.20 and the rest being Fe and other unavoidable impurity. When the welding wire is used to make protective welding by adopting mixed gas (80% Ar+20% CO2), the wield metal tensile strength is greater than or equal to 580 Mpa, -30 deg.C impact work Akv is greater than or equal to 80J, and it adapts to all-position welding. This invented welding wire possesses excellent processing property, and is suitable for gas protective arc welding of large-type structures of 600 MPa level low-alloy high strength steel, engineering machine, railway bridge, marine installation, high-pressure container and oil-gas transmission pipeline, etc.
Description
[technical field]
The present invention relates to a kind of microtitanium-boron high-toughness gas protective welding stick, specifically a kind of employing mist (80%Ar+20%CO
2) when protection is welded, the tensile strength 〉=580MPa of weld metal ,-30 ℃ of ballistic work A
KvThe welding wire of 〉=80J is a kind of welding wire of gas shielded arc welding of the 600MPa of can be used for level low alloy steel, belongs to field of welding material.
[background technology]
In recent years, because gas shielded arc welding production efficiency height, cost are low, be widely used in the making of large-scale important structure such as engineering machinery, railroad bridge, marine facility, high-pressure bottle.Simultaneously, in said structure, adopt the above intensity rank of 600MPa, have the steel of excellent low-temperature impact toughness, to reduce material consumption, alleviate construction weight, improve structural behaviour and security, become the manufacturing development trend of domestic and international structure, the situation of this growth is to the obdurability of welding point, and then the welding material and the welding technological properties thereof that obtain these performances are had higher requirement.But present other gas protecting welding wire scarcity of domestic respective strengths level for a long time, generally adopts traditional Mn-Si series solder wire H08Mn2Si, and its weak point is that the weld metal low-temperature impact toughness is relatively poor.General Research Inst. of Iron and Steel, Ministry of Metallurgical Industry has been introduced " a kind of gas protecting welding wire " in the patent (number of patent application is 95108258) of people such as pretty river invention; this welding wire weld metal has good low-temperature impact toughness; but it is on the low side that weak point is tensile strength, still can not satisfy the gas shielded arc welding of 600MPa level low alloy steel.The MG60 gas protecting welding wire that other has Japan Kobe system iron to be produced, though its weld metal tensile strength 〉=600MPa, weak point is that the impact flexibility level still is difficult to satisfy the instructions for use of structure under low temperature is on active service.
[summary of the invention]
The objective of the invention is to propose a kind of microtitanium-boron high-toughness gas protective welding stick that can overcome the deficiency of above-mentioned technology; a kind of postwelding weld metal tensile strength 〉=580MPa; low-temperature impact toughness is good, and welding technological properties is good, gas protecting welding wire applied widely.
For achieving the above object; the present invention proposes a kind of microtitanium-boron high-toughness gas protective welding stick; the chemical analysis (% by weight) that it is characterized in that welding wire is: C 0.03～0.10, Mn 1.00～1.80, Si 0.20～1.00, Ni 0.50～1.40, Ti 0.10～0.20, B 0.002～0.010, S≤0.10, P≤0.20, surplus are Fe and other unavoidable impurities.
An effective way that improves gas protecting welding wire weld metal obdurability is to produce a large amount of in weld seam and uniform fine acicular ferritic structure.Acicular ferrite can be summed up as schedule of reinforcements such as solution strengthening, refined crystalline strengthening, dislocation strengthening to the contribution of intensity.The mechanism that acicular ferrite improves toughness is: acicular ferrite reduces effective crystallite dimension, crackle expansion limit stress is improved, simultaneously because each lath position of acicular ferrite to entanglement, has hindered the expansion of crackle.
For in weld seam, obtaining a large amount of acicular ferrite structures, must make weld metal have suitable alloy system, change with the restriction pro-eutectoid ferrite, and in weld metal, produce the field trash that certain size distributes, make acicular ferrite have suitable forming core particle and growing space.Various elements such as C, Mn, Si, Ni have improved the quenching degree of weld metal, have suppressed the generation of pro-eutectoid ferrite, promote the formation of acicular ferrite in certain adding scope.The compound adding of an amount of Ti and B can enlarge the transition region of acicular ferrite, makes that the quantity of acicular ferrite increases in the weld seam.
The design principle of welding wire chemical analysis of the present invention is described as follows:
C 0.03～0.10:C is an essential element of adjusting weld metal intensity, and must guarantee has certain C content in the welding wire; Simultaneously, the C in the welding wire also influences the processing performance of welding wire, and in certain adding scope of C, along with C content increases, arc stability improves, and the droplet transfer characteristic is improved, and the welding wire process performance improves.But too much C content can make the weld metal hardenability increase, and plasticity reduces, and crack sensitivity increases.Therefore, the carbon content scope in the welding wire is set at 0.03～0.10.Si 0.20～1.00: in gas protecting welding wire, Si is indispensable as one of main deoxidant element, and Si works to adjust intensity in weld metal simultaneously.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 is increased, the welding wire process performance is descended.Therefore, Si content is controlled at 0.20～1.00th, suitable.
Mn 1.00～1.80:Mn and Si play the combined deoxidation effect, the forming core particle that oxide inclusions that deoxygenation produces and oxygen sulphur duplex impurity can be used as acicular ferrite.And Mn is the effective element that weld seam is strengthened, and is insufficient at molten drop and the deoxidation of melt tank reaction stage when Mn content is lower than 1.00 in the welding wire, makes too high oxygen level in the weld seam, and makes weld strength on the low side.When in the welding wire during Mn too high levels, the low temperature of weld metal obviously descends towards toughness.Therefore, the Mn content in the welding wire should be in 1.00～1.80.
Ni 0.50～1.40:Ni can improve the toughness of weld metal, especially improves the low-temperature impact toughness of weld metal, 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 0.50, but Ni belongs to noble element, should not add, so the Ni content in the welding wire is controlled between 0.50～1.40.
The NONEQUILIBRIUM SEGREGATION of B 0.002～0.010:B on austenite grain boundary will obviously suppress pro-eutectoid ferrite forming core on austenite grain boundary in weld seam, promote that acicular ferrite forms in austenite crystal, thereby improve the impact flexibility of weld metal.But then, excessive B can increase the weld metal hot cracking tendency.The transfer coefficient of considering B is lower, thereby the B content in the welding wire is 0.002～0.010.
Ti 0.10～0.20: oxidation and nitrogenize for preventing B, add Ti in the welding wire of being everlasting, and Ti and O, N have high affinity, and the oxide of Ti and nitride can be used as the forming core particle of acicular ferrite.Ti, B unite and add fashionablely, can enlarge the zone that acicular ferrite changes, and obtain a large amount of acicular ferrites thereby can stablize in weld seam.Generally between 0.01～0.04, because the Ti transfer coefficient is low, Ti content should be 0.10～0.20 to the content of Ti in the welding wire in the weld metal.
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 adds an amount of Ti and B by uniting in gas protecting welding wire, enlarge the zone that acicular ferrite changes, and obtains a large amount of acicular ferrites thereby stablize in weld seam; Add Si, Mn and carry out combined deoxidation, make to have suitable oxygen content in the weld metal; Adding Ni further improves the intensity and the low-temperature impact toughness of weld metal; Reduce the content of harmful elements such as S, P as far as possible.By above-mentioned wire composition design, thereby make weld metal have suitable alloy system, and finally make corresponding weld metal obtain excellent obdurability coupling.
Welding wire of the present invention has following advantage:
1) is applicable to the gas shielded arc welding of 600MPa level low alloy steel.Adopting mist (80%Ar+20%CO
2) when protecting, the tensile strength 〉=580MPa of weld metal ,-30 ℃ of ballistic work A
Kv〉=80J.Can be widely used in the making of large-scale important structure such as engineering machinery, railroad bridge, marine facility, high-pressure bottle, transportation pipe line.
2) welding wire has the favorable manufacturability energy, welding arc stablility, and it is little to splash, and pore-free, moulding are attractive in appearance, are adapted to all-position welding.
3) the used alloy system of welding wire of the present invention is suitable, and its wire rod smelts, rolling and drawing welding wire technology realizes that easily the cost of welding wire is lower.
[specific embodiment]
Be described in further detail with specific embodiment below the present invention:
Embodiment 1: adopt 0.5 ton of electric furnace, select low S, P steel scrap to carry out welding wire steel and smelt. Smelt Note gas content in the control steel in the process, smelting process is not had specific (special) requirements. The chemistry of welding wire steel becomes Part (by weight %) is: C 0.05, Mn 1.54, Si 0.50, S 0.005, P 0.005, Ni0.89, Ti 0.11, B 0.006, surplus is Fe and other inevitable impurity. To weld after the smelting The silk steel rolling becomes 60 * 60 * 1500 (mm) square billet, is drawn into then the welding wire that specification is φ 1.2mm, Behind copper coating, become finished product welding wire of the present invention.
With welding wire of the present invention at mist (80%Ar+20%CO2) carry out deposited metal and connect under the protection Standard is: welding current 220～260A, and weldingvoltage 24～26V, speed of welding 22cm/min, Weld heat input 16.4kJ/cm. Welding thickness of slab 20mm, 45 ° of bevel angles, band 12mm backing plate, root The section gap is 12mm. The mechanical property of deposited metal: σs＝515MPa，σ
b＝595MPa，
δ
5=24%, ψ=73%, 20 ℃ ballistic work Akv=159J ,-20 ℃ of ballistic work Akv=125J ,-30 ℃ of ballistic work Akv=97J ,-40 ℃ of ballistic work Akv＝83J。
Embodiment 2: use welding wire of the present invention at mist (80%Ar+20%CO2) protection under carry out the low-carbon (LC) shellfish Family name's body steel DB590 butt-weld in the downhand position. DB590 steel chemical analysis (by weight %) contains: C 0.067, Si 0.305, Mn 1.439, P 0.019, S 0.008, Nb 0.041, Cu 0.108, Ti0.021, B 0.0010. Welding conditions are: welding current 200～220A, and weldingvoltage 21～25V, speed of welding 18～20cm/min, average weld heat input 15.3kJ/cm. The welding thickness of slab 7mm, 70 ° of bevel angles, root face 1mm, root do not stay the gap.
The chemical analysis of weld metal (by weight %) contain C 0.049, Mn 1.21, Si 0.18, S 0.006, P 0.009, Ni 0.62, Ti 0.025, B 0.0053. The mechanics of weld metal Performance is: σb=630MPa ,-30 ℃ of ballistic work Akv=156J ,-40 ℃ of ballistic work Akv=133J (impact check employing non-standard sample size 5mm * 10mm * 55mm). Welding point clod wash d=3a, 180 ° intact.
In welding process, welding arc stablility, it is little to splash, and pore-free, moulding are attractive in appearance, are adapted to complete The position welding, welding wire has good processing performance.
Embodiment 3: welding wire of the present invention adopts mist (80%Ar+20%CO2) protect and carry out pipe line steel The X70 butt-weld in the downhand position. X70 steel chemical analysis (by weight %) contains: C 0.06, Mn 1.46, Si0.25, S 0.003, P 0.012, Ni 0.20, Cu 0.22, Mo 0.22. Welding conditions are: weldering Meet electric current 190～210A, weldingvoltage 25～27V, speed of welding 24～26cm/min, sealing wire Energy 12.5kJ/cm. Welding thickness of slab 11mm, 60 ° of bevel angles are not between root face 1mm, root stay The crack.
The chemical analysis of weld metal (by weight %) contains: C 0.054, Mn 1.38, Si0.23, S 0.0026, P 0.009, Ni 0.46, Cu 0.21, Cr 0.024, Ti 0.035, B0.0016. The mechanical property of weld metal is: σs＝575MPa，σ
b＝675MPa，δ
5=24%, ψ=77% ,-20 ℃ of ballistic work Akv=173J ,-30 ℃ of ballistic work Akv=152J ,-40 ℃ of ballistic work Akv＝148J。
Above-described embodiment explanation welding wire of the present invention is adopting mist (80%Ar+20%CO2) when protecting, suitable Be used for 600MPa level low alloy high-strength steel engineering machinery, railroad bridge, marine facility, high-pressure bottle, The gas shielded arc welding of the large-scale important structure such as transportation pipe line.
Claims (1)
1. microtitanium-boron high-toughness gas protective welding stick; the chemical analysis (% by weight) that it is characterized in that welding wire is: C 0.03～0.10, Mn 1.00～1.80, Si 0.20～1.00, Ni 0.50～1.40, Ti 0.10～0.20, B 0.002～0.010, S≤0.10, P≤0.20, surplus are Fe and other unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011283262A CN1152767C (en) | 2001-08-08 | 2001-08-08 | Microtitanium-boron high-toughness gas protective welding stick |
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|---|---|---|---|
| CNB011283262A CN1152767C (en) | 2001-08-08 | 2001-08-08 | Microtitanium-boron high-toughness gas protective welding stick |
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| CN1328897A true CN1328897A (en) | 2002-01-02 |
| CN1152767C CN1152767C (en) | 2004-06-09 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7119155B2 (en) * | 2002-10-25 | 2006-10-10 | Exxonmobil Chemical Patents Inc. | Polymerized catalyst composition II |
| CN100443246C (en) * | 2007-01-30 | 2008-12-17 | 山东大学 | Filling metallic particles for overlay welding and its preparation method |
| CN100460136C (en) * | 2007-01-30 | 2009-02-11 | 山东大学 | Filling metal particle for welding and manufacturing method therefor |
| CN100462185C (en) * | 2006-12-05 | 2009-02-18 | 金秋生 | Welding wire for gas shielded arc welding for high-tensile structural steel |
| CN101259571B (en) * | 2007-03-08 | 2010-10-06 | 株式会社神户制钢所 | Solid soldering wire for carbon dioxide gas protection arc welding |
| CN101992365A (en) * | 2010-12-20 | 2011-03-30 | 成都新大洋焊接材料有限责任公司 | High-strength and high-tenacity gas shielded welding wire |
| CN101318276B (en) * | 2007-06-08 | 2011-05-11 | 株式会社神户制钢所 | Solid-core welding wire for carbon dioxide gas protection arc welding |
| CN101367153B (en) * | 2008-07-14 | 2011-06-15 | 武汉钢铁(集团)公司 | High-strength bridge steel-gas protective welding method |
| CN1817550B (en) * | 2002-10-31 | 2011-09-07 | 株式会社神户制钢所 | Tubular wire rod for double-electrode gas protective welding |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100423880C (en) * | 2005-07-07 | 2008-10-08 | 武汉钢铁(集团)公司 | Gas-shielded welding wire for welding high-strength steel |
-
2001
- 2001-08-08 CN CNB011283262A patent/CN1152767C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7119155B2 (en) * | 2002-10-25 | 2006-10-10 | Exxonmobil Chemical Patents Inc. | Polymerized catalyst composition II |
| CN1817550B (en) * | 2002-10-31 | 2011-09-07 | 株式会社神户制钢所 | Tubular wire rod for double-electrode gas protective welding |
| CN100462185C (en) * | 2006-12-05 | 2009-02-18 | 金秋生 | Welding wire for gas shielded arc welding for high-tensile structural steel |
| CN100443246C (en) * | 2007-01-30 | 2008-12-17 | 山东大学 | Filling metallic particles for overlay welding and its preparation method |
| CN100460136C (en) * | 2007-01-30 | 2009-02-11 | 山东大学 | Filling metal particle for welding and manufacturing method therefor |
| CN101259571B (en) * | 2007-03-08 | 2010-10-06 | 株式会社神户制钢所 | Solid soldering wire for carbon dioxide gas protection arc welding |
| CN101318276B (en) * | 2007-06-08 | 2011-05-11 | 株式会社神户制钢所 | Solid-core welding wire for carbon dioxide gas protection arc welding |
| CN101367153B (en) * | 2008-07-14 | 2011-06-15 | 武汉钢铁(集团)公司 | High-strength bridge steel-gas protective welding method |
| CN101992365A (en) * | 2010-12-20 | 2011-03-30 | 成都新大洋焊接材料有限责任公司 | High-strength and high-tenacity gas shielded welding wire |
| CN101992365B (en) * | 2010-12-20 | 2013-07-24 | 成都新大洋焊接材料有限责任公司 | High-strength and high-tenacity gas shielded welding wire |
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| Publication number | Publication date |
|---|---|
| CN1152767C (en) | 2004-06-09 |
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