CN1358607A - High-toughness gas protective welding wire for low alloy high-strength steel - Google Patents
High-toughness gas protective welding wire for low alloy high-strength steel Download PDFInfo
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- CN1358607A CN1358607A CN 01133651 CN01133651A CN1358607A CN 1358607 A CN1358607 A CN 1358607A CN 01133651 CN01133651 CN 01133651 CN 01133651 A CN01133651 A CN 01133651A CN 1358607 A CN1358607 A CN 1358607A
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Abstract
The chemical composition of high-toughness gas shielded welding wire for low alloy high-strength steel contains (wt%): C 0.05-0.12, Mn 1.20-2.00, Ni 0.60-1.60, Si 0.30-1.20, Cu 0.10-0.50, Cu 0.10-0.60, Ti 0.10-0.20, B 0.02-0.010, S is less than or equal to 0.10, P is less than or equal to 0.20 and the rest is Fe and inevitable impurity elements. When said welding wire is used to make mixed gas (80% Ar+20% Co2) shielded arc welding the weld metal tensile strength is 700-800 MPa, and the persuccion power at -30 deg.C Akv is greater than or equal to 80J. Said invented with is applicable to gas shielded arc welding for 700 MPa low-alloy high-strength steel, and possesses good technological performance and is suitable for welding all positions.
Description
[technical field]
The present invention relates to a kind of high-toughness gas protective welding wire for low alloy high-strength steel, belong to field of welding material.This welding wire adopts mixed gas (80%Ar+20%CO
2) when protection was welded, the tensile strength of weld metal was 700～800MPa ,-30 ℃ of ballistic work A
Kv〉=80J.
[background technology]
At present; the usage quantity of gas protecting welding wire has accounted for 31% of welding material output in the U.S.; Japan accounts for 41%; West Europe accounts for 56%; domestic 10% of the wlding total amount that only accounts for; domestic still do not have sophisticated 700MPa grade gas shielded welding commodity welding wire, and kind is single, can not satisfy the demand of growing low-alloy high-strength steel shielded welding far away.The domestic Mn-Si series solder wire ER70S-6 that generally adopts low coupling, its weak point is that welding wire weld seam metal anti-stretching intensity is lower than 600MPa, low-temperature impact toughness is relatively poor.The ST700 mixed gas arc welding silk that ESAB company produces, though deposited metal tensile strength has reached 700MPa, its weak point is that impelling strength can not satisfy the service requirements of structure under low temperature is on active service." the line gas protection welding wire and the pipeline circumferential weld gas-shield welding method " of Co., Ltd. of Japanese Nippon Steel application in 2000; number of patent application JP2000218391A; the weld metal of the gas protecting welding wire of introducing has good low-temperature impact toughness, can not stablize and reaches 700MPa but weak point is a tensile strength.
[summary of the invention]
The purpose of this invention is to provide a kind of high-toughness gas protective welding wire for low alloy high-strength steel; weld metal tensile strength reaches 700～800MPa; the low-temperature impact toughness height, welding technological properties is good, can be used for that respective strengths rank low-alloy high-strength steel is large-scale, the gas protecting welding wire of important structure.
For achieving the above object; the invention provides a kind of high-toughness gas protective welding wire for low alloy high-strength steel; the Chemical Composition (% by weight) that it is characterized in that welding wire is: C 0.05～0.12, Mn1.20～2.00, Ni 0.60～1.60, Si 0.30～1.20, Cu 0.10～0.50, Cr0.10～0.60, Ti 0.10～0.20, B 0.002～0.010, S≤0.10, P≤0.20, surplus are Fe and unavoidable impurities element.
For tensile strength is the low-alloy high-strength steel of 700MPa level, make weld metal tensile strength reach 700～800MPa, obtain simultaneously good low-temperature impact toughness again, key is to impel the fine acicular ferritic structure that produces a large amount of high density dislocations in weld metal by add suitable alloying element in welding wire.For this reason, weld metal must have suitable alloy system, and satisfies following condition.
1. the restriction proeutectoid ferrite changes.
The NONEQUILIBRIUM SEGREGATION of B on austenite grain boundary of trace will obviously suppress proeutectoid ferrite forming core on austenite grain boundary in weld seam.Be oxidation and the nitrogenize that prevents B, need in weld seam, to add Ti.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.And have interaction between Ti, the B, when having the cooperation scope an of the best between the two, corresponding weld metal has excellent obdurability coupling.But the best fit scope of above-mentioned Ti, B content is different because of different weld seam alloy system and weld strength.
2. in not changing austenite crystal, there be the forming core particle of the inclusion of some amount and size as acicular ferrite.
Cross when austenite and to be as cold as acicular ferrite transition temperature when zone, because of the crystal boundary forming core is suppressed, the ferrite faller gill is that the center begins forming core and grows up with the intracrystalline inclusion just, till the faller gill that runs into other.The acicular ferrite sheet of elder generation's forming core can bring out other ferrite lamellae forming core.
The generation of oxide inclusion is because oxygen few solid solution in weld seam in the weld seam, when the Si in the welding wire, Mn by the drop transfer in weld seam the time, Si, Mn etc. carry out deoxygenation formation oxide inclusion or the oxygen sulfur compound is mingled with in most oxygen and the weld seam.Wherein the part inclusion is at high temperature grown up, and separates and enters in the slag.Part is stayed in the weld seam because of cooling off fast.Some inclusion is the nitride that the Ti denitrogenation forms.Above-mentioned inclusion or complex inclusion all might be as the forming core particles of acicular ferrite, and the quantity that does not change inclusion in the austenite crystal directly determines the size of acicular ferrite faller gill.
3. suitable austenite grain size acicular ferrite forms relevant with austenitic grain-size, when austenite grain size relatively hour, do not have enough spaces to form at intracrystalline, but preferentially carry out proeutectoid ferrite and bainite transformation at crystal boundary for acicular ferrite.The distribution of sizes of inclusion has significant effects to austenite grain size.
4. suitable weld metal hardening capacity
Various elements such as C, Mn, Si, Ni, Cr, Cu can improve the hardening capacity of weld metal, suppress the generation of proeutectoid ferrite, promote the formation of acicular ferrite.The weld metal alloy system that is made of above-mentioned element is in certain adding scope, can reduce the transition temperature of acicular ferrite, make the acicular ferrite that changes at a lower temperature have higher dislocation desity, thereby make weld metal tensile strength when reaching 700～800MPa, obtain good low-temperature impact toughness again.
But in the high strength weld metal, too high carbon content promotes the formation of high carbon martensite, and weld metal cold crack susceptibility is increased, and therefore the C content in the welding wire is controlled in 0.05%～0.12% scope.
Too high Mn content easily causes the segregation of Mn in the weld metal, easily produces the M-A island structure in the line of segragation, thereby reduces the toughness of weld metal, therefore, the Mn content in the welding wire is controlled between 1.20%～2.00%.
There is interaction between influence of Ni impact flexible and the Mn content in the weld metal, in the time of within two kinds of elements are positioned at best cooperation scope, corresponding weld metal has excellent obdurability coupling, therefore, according to the add-on of above-mentioned Mn, the optimum range that can determine Ni add-on in the welding wire is 0.60%～1.60%.
The Si add-on is 0.30%～1.20% 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 shielded welding and definite.
The effect of Cu in weld metal is relevant with its content, when Cu content less than 0.5% the time, play strengthening effect in the solution hardening mode, and reduce acicular ferrite and begin transition temperature, be beneficial to the fine acicular ferrite that obtains high density dislocation; When Cu content greater than 0.5% the time, play strengthening effect in the precipitation-hardening mode.When Cu exists in weld seam with the precipitated phase form, the butt welded seam metal toughness influence more complicated, therefore the Cu content in the welding wire is controlled at 0.10%～0.50% and is advisable.
The content of Cr in the welding wire is designed to 0.10%～0.60%, is because the effect of Cr reinforced ferrite is remarkable, and too high Cr content can cause weld metal cold crack susceptibility to increase.
The content of Ti, B is respectively 0.01%～0.04% and 0.001%～0.004% in the weld seam.Because two kinds of transfer coefficient of elements are lower, Ti, B adopt associating adding better effects if in the welding wire, and Ti content should be 0.10%～0.20%, B content should be 0.002%～0.010%.
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 level in the weld metal, and the reinforced ferrite matrix; Adding Ni further improves the intensity and the low-temperature impact toughness of weld metal; Adding Cu is beneficial to obtain the fine acicular ferrite of high density dislocation; Add Cr with reinforced ferrite; 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. 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.
2. welding wire of the present invention 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. welding wire steady quality of the present invention is adopting mixed gas (80% Ar+20% CO
2) when protection was welded, the tensile strength of weld metal reached 700～800MPa ,-30 ℃ of ballistic work A
Kv〉=80J.Be applicable to the gasshielded arc welding of 700MPa level low alloy steel, can be widely used in that engineering machinery, railroad bridge, maritime facilities, high pressure vessel, transportation pipe line etc. are large-scale, the welding of important structure low-alloy high-strength steel.
[embodiment]
With embodiment welding wire of the present invention is described in further detail below:
Embodiment 1: adopt 0.5 ton of electric furnace, select for use low S, P steel scrap to carry out welding wire steel and smelt.Note gas content in the control steel in the smelting process, smelting technology is not had particular requirement.The Chemical Composition of welding wire steel (% by weight) is: C 0.063, Mn 1.77, Ni 1.25, Si 0.65, Cu 0.30, Cr 0.27, Ti 0.19, B 0.0074, S 0.0079, P 0.011, surplus is Fe and unavoidable impurities element.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 mixed gas (80% Ar+20% CO
2) protect and carry out the deposited metal service check, welding condition are: welding current 220～260A, weldingvoltage 24～26V, welding speed 22cm/min, gas flow 18L/min, weld heat input 16.4kJ/cm.Welding thickness of slab 20mm, 45 ° of groove angles, band 12mm backing plate, root opening is 12mm.The mechanical property of deposited metal is: σ
s=665MPa, σ
b=740MPa, δ
5=17%, ψ=63%, the average ballistic work A of deposited metal series of temperatures
KvBe respectively 126J (20 ℃), 110J (20 ℃), 102J (30 ℃), 97J (40 ℃).
Embodiment 2: adopt welding wire of the present invention at mixed gas (80%Ar+20%CO
2) carry out low-carbon bainite steel downhand welding butt joint check under the protective condition.Low-carbon bainite steel main chemical (% by weight) contains: C 0.06, Si 0.35, Mn 1.55, P 0.013, S 0.0043, Nb 0.042, Cu0.153, Ti 0.018, B 0.0011, steel plate tensile strength sigma
bBe 715MPa.Welding condition are: welding current 200～220A, weldingvoltage 21～25V, welding speed 19cm/min, average weld heat input 15.3kJ/cm.Welding thickness of slab 6mm, 70 ° of groove angles, root face 1mm, root do not stay the gap.The main chemical of weld metal (% by weight) contains: C 0.047, Si0.414, Mn 1.38, P 0.011, S 0.008, Ni 0.95, Cr 0.20, Ti 0.041, B0.0070.The joint tension assay reflection joint 17mm place outside weld seam of breaking, the average ballistic work A of weld metal series of temperatures
KvBe respectively 131J (0 ℃), 126J (30 ℃), 130J (40 ℃), 111J (50 ℃) (impact check and adopt nonstandard specimen size), welding joint clod wash d=3a, 180 ° are intact.
Welding wire of the present invention 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.Be applicable to the gasshielded arc welding of 700MPa level low alloy high-strength steel, can be widely used in that engineering machinery, railroad bridge, maritime facilities, high pressure vessel, transportation pipe line etc. are large-scale, the welding of important structure low-alloy high-strength steel.
Claims (1)
1. high-toughness gas protective welding wire for low alloy high-strength steel; the Chemical Composition (% by weight) that it is characterized in that welding wire is: C 0.05～0.12, Mn 1.20～2.00, Ni 0.60～1.60, Si 0.30～1.20, Cu 0.10～0.50, Cr 0.10～0.60, Ti 0.10～0.20, B 0.002～0.010, S≤0.10, P≤0.20, surplus are Fe and unavoidable impurities element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133651 CN1127390C (en) | 2001-11-08 | 2001-11-08 | High-toughness gas protective welding wire for low alloy high-strength steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01133651 CN1127390C (en) | 2001-11-08 | 2001-11-08 | High-toughness gas protective welding wire for low alloy high-strength steel |
Publications (2)
| Publication Number | Publication Date |
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| CN1358607A true CN1358607A (en) | 2002-07-17 |
| CN1127390C CN1127390C (en) | 2003-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01133651 Expired - Fee Related CN1127390C (en) | 2001-11-08 | 2001-11-08 | High-toughness gas protective welding wire for low alloy high-strength steel |
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| CN101357425B (en) * | 2008-04-28 | 2010-09-01 | 湖北猴王焊材有限公司 | Weather resistance steel argon-rich gas shielded welding wire for high-intensity railway vehicle |
| CN101457273B (en) * | 2009-01-06 | 2010-10-27 | 首钢总公司 | Method for producing steel for small square billet continuous casting high titanium alloy bonding wire |
| CN101905390A (en) * | 2010-08-23 | 2010-12-08 | 武汉钢铁(集团)公司 | Gas-protection welding wire with low alloy and high strength |
| CN101984121A (en) * | 2010-12-09 | 2011-03-09 | 宣化钢铁集团有限责任公司 | Steel wire rod for 600MPa-grade high-strength welding wire and production process thereof |
| CN103464871A (en) * | 2013-09-06 | 2013-12-25 | 张盘 | High-toughness CO2 gas protection welding wire and wire rod and application thereof |
| CN104588913A (en) * | 2014-11-21 | 2015-05-06 | 宝鸡石油钢管有限责任公司 | Welding wire for submerged-arc welding suitable for X70 offshore oil and gas conveying steel |
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| CN103480976B (en) * | 2013-09-03 | 2016-04-20 | 海宁瑞奥金属科技有限公司 | A kind of high-intensity high-tenacity gas shield welding wire |
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| CN109093284A (en) * | 2018-09-13 | 2018-12-28 | 上海大西洋焊接材料有限责任公司 | A kind of low alloy steel welding wire used for gas shield welding for marine worker rack steel Q690 welding |
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| 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 |
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2001
- 2001-11-08 CN CN 01133651 patent/CN1127390C/en not_active Expired - Fee Related
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| CN101357425B (en) * | 2008-04-28 | 2010-09-01 | 湖北猴王焊材有限公司 | Weather resistance steel argon-rich gas shielded welding wire for high-intensity railway vehicle |
| CN101457273B (en) * | 2009-01-06 | 2010-10-27 | 首钢总公司 | Method for producing steel for small square billet continuous casting high titanium alloy bonding wire |
| CN101905390A (en) * | 2010-08-23 | 2010-12-08 | 武汉钢铁(集团)公司 | Gas-protection welding wire with low alloy and high strength |
| CN101984121A (en) * | 2010-12-09 | 2011-03-09 | 宣化钢铁集团有限责任公司 | Steel wire rod for 600MPa-grade high-strength welding wire and production process thereof |
| CN103480976B (en) * | 2013-09-03 | 2016-04-20 | 海宁瑞奥金属科技有限公司 | A kind of high-intensity high-tenacity gas shield welding wire |
| CN103464871B (en) * | 2013-09-06 | 2016-03-30 | 海宁瑞奥金属科技有限公司 | A kind of high tenacity CO 2gas protecting welding wire and application thereof |
| CN103464871A (en) * | 2013-09-06 | 2013-12-25 | 张盘 | High-toughness CO2 gas protection welding wire and wire rod and application thereof |
| CN104588913A (en) * | 2014-11-21 | 2015-05-06 | 宝鸡石油钢管有限责任公司 | Welding wire for submerged-arc welding suitable for X70 offshore oil and gas conveying steel |
| CN104801891A (en) * | 2015-04-24 | 2015-07-29 | 柳州金茂机械有限公司 | Manufacturing method of welding wire for welding process |
| CN104858562A (en) * | 2015-05-06 | 2015-08-26 | 贵州航天凯宏科技有限责任公司 | Heat-resistant flux-cored wire |
| CN108672981A (en) * | 2018-07-25 | 2018-10-19 | 武汉铁锚焊接材料股份有限公司 | A kind of increasing material manufacturing solid welding wire and its welding method |
| CN110773904A (en) * | 2018-07-30 | 2020-02-11 | 宝山钢铁股份有限公司 | Low carbon CO suitable for ultralow heat input automatic welding 2Gas shielded welding wire and method for manufacturing same |
| CN110773903A (en) * | 2018-07-30 | 2020-02-11 | 宝山钢铁股份有限公司 | CO suitable for ultralow heat input automatic welding 2Gas shielded welding wire and method for manufacturing same |
| CN109093284A (en) * | 2018-09-13 | 2018-12-28 | 上海大西洋焊接材料有限责任公司 | A kind of low alloy steel welding wire used for gas shield welding for marine worker rack steel Q690 welding |
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| CN108941975B (en) * | 2018-09-18 | 2021-03-16 | 天津市永昌焊丝有限公司 | High-toughness tungsten electrode gas protection welding wire for nuclear power manganese-nickel-molybdenum low-alloy high-strength steel |
| CN112692464A (en) * | 2020-12-16 | 2021-04-23 | 哈焊所华通（常州）焊业股份有限公司 | Corrosion-resistant high-strength welding material for E690 steel for ocean engineering |
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