CN102152025B - Gas shielded welding wire with 900MPa tensile strength - Google Patents
Gas shielded welding wire with 900MPa tensile strength Download PDFInfo
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- CN102152025B CN102152025B CN 201110112979 CN201110112979A CN102152025B CN 102152025 B CN102152025 B CN 102152025B CN 201110112979 CN201110112979 CN 201110112979 CN 201110112979 A CN201110112979 A CN 201110112979A CN 102152025 B CN102152025 B CN 102152025B
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Abstract
The invention relates to a gas shielded welding wire with 900MPa tensile strength, which comprises the following components in percents by weight: 0.06-0.10% of C, 0.40-0.60% of Si, 1.60-1.90% of Mn, not more than 0.020% of P, not more than 0.020% of S, 2.40-3.00% of Ni, 0.40-0.69% of Cr, 0.40-0.80% of Mo, 0.20-0.40% of Cu, 0.05-0.15% of Ti, not more than 0.005% of N, not more than 0.015% of Al and the balance of Fe and unavoidable impurities. The carbon equivalent CE of the welding wire is 0.70-0.85, and CE = C + Mn/6 + (Ni+Cu)/15 + (Cr+Mo+V)/5. The invention provides a super-high strength gas shielded welding wire. The strength of welding joints is higher than 900MPa, and the toughness of the welding joints is higher than 227J at -20 DEG C KV. The textures of all parts of multiple layers of welding joints are uniform. The impact fractures are mainly dimple fractures. In the invention, the matched welding material for the application of super-high strength steel in China is provided.
Description
Technical field
The present invention relates to shield-arc welding solid core welding wire, specifically belong to the welding wire that the elements such as a kind of Ni of employing, Cr, Mo and Cu carry out alloying, when using, (be mainly 20%CO with rich Ar
2+ 80%Ar) gas as the protection gas; weld strength is higher than 900MPa; impact flexibility is good, and the heat affected area tissue on weld seam and the weld seam is martensite and adds bainite, and the comparatively uniformly gas protecting welding wire of tensile strength 900MPa level is organized at each position of multilayer weld.
Background technology
Along with steel construction progressively develops to lightweight, the intensity of ferrous materials improves day by day, and the application percentage of the iron and steel kind of tensile strength 900MPa level constantly enlarges.The above steel grade major part of tensile strength 900MPa adopts hardening and tempering process now, and the part steel grade has been used the advanced technologies productions such as TMCP, DIFT and SIDT, and the cracking resistance of steel has some improvement.900MPa level welding material is most of to be relied on from external import.Or adopt other welding wire of low intensity level to make low-intensity welding coupling, thereby make the advantage of high-strength steel grade can not get bringing into play completely.Development 900MPa level welding material has larger economy and technical meaning.
The tensile strength that JP2001001181 provides for the Kawasaki Steel has the gas protecting welding wire of superhigh intensity, superhigh tenacity up to more than the 950MPa.Its master alloying is Mn-Ni-Cr-Mo, and wherein Ni, Mo and Cr content are higher, cause cost higher; Other also adds Ti and Al carries out microalloying.The addition of this welding wire Ti is less, easily causes fine Ti compound particle number decline in the weld seam, the pinning effect of reduction grain nucleation.Be mingled with and Al content can form the Al that contains of larger particles when higher, make the weld seam embrittlement.
JP2007260697 for day iron live gold and weld industrial group and provide hot strength to be higher than more than the 900MPa, be used for high strength, the high-ductility gas shielded welding wire of high-tensile structural steel.Its master alloying is Mn-Ni-Cr-Mo, and wherein Ni, Mo and Cr content are higher, and other adds Ti, Al and V or Nb and carries out microalloying.The adding of V and Al easily causes coarse grain zone, the heat affected area embrittlement on the weld seam.
In addition, more than two patent composition scopes very wide, simultaneously near the upper limit or lower its corresponding welding wire weld seam intensity difference will be very large in limited time, the welding wire metallographic structure will be very unstable also at each element of actual constituent.Also can increase simultaneously drawing welding wire technique than great fluctuation process.
Summary of the invention
The object of the invention is to overcome the deficiency of present existence, provide a kind of welding deposited metal typical case mechanical property to be: tensile strength (Rm) is 960MPa, percentage elongation (A) is 15%, and the contraction percentage of area (Z) is 63.0%, v-notch Charpy-V impact power-20 ℃ KV
2Be 67J ,-50 ℃ of KV
254J, the heat affected area tissue on weld seam and the weld seam is martensite+bainite, and seam organization is even, and deposited metal impact fracture pattern is take the dimple shape as main gas protecting welding wire.
Realize the technical measures of above-mentioned purpose:
A kind of gas protecting welding wire of tensile strength 900MPa level, its component and percentage by weight are: C:0.06～0.10%, Si:0.40～0.60%, Mn:1.60～1.90%, P≤0.020%, S≤0.020%, Ni:2.40～3.00%, Cr:0.40～0.69%, Mo:0.40～0.80%, Cu:0.20～0.40%, Ti:0.05～0.15%, N≤0.005%, Als≤0.015%, all the other are Fe and inevitable impurity; Welding wire carbon equivalent ce: 0.70～0.85, CE=C+Mn/6+ (Ni+Cu)/15+ (Cr+Mo+V)/5.
The function and mechanism of each element among the present invention
C: when C content was low, weld strength was lower; When the C too high levels, welding seam toughness descends.C content in the welding wire is 0.06～0.10% better.
Si: have on the one hand deoxidation, also butt welding is sewed with invigoration effect on the other hand.But can affect the toughness of weld seam when Si content is too high in the weld seam, reduce the cracking resistance of weld seam.The weight percent content 0.40～0.60% of Si in the welding wire.
Mn: be the effective element of weld seam Strengthening and Toughening, when gas is protected weldering, also help deoxidation, prevent from causing the formation of the iron sulfide of fire check.Mn content is 1.6～1.90% in the welding wire.
Ni: the toughness that is conducive to improve weld metal is low-temperature impact toughness especially, reduces brittle transition temperature.Ni can reduce the proeutectoid ferrite body burden and improve welding seam toughness.The Ni too high levels can cause weld seam and mother metal composition difference large, and the welding wire cost increases simultaneously.The weight percent content of Ni is 2.4～3.0% in the welding wire.
Cr: be a kind of effective intensified element, and the effect of refinement ferrite crystal grain is arranged, but too high Cr can reduce the toughness of weld seam.The weight percent content of Cr is 0.40～0.69% in the welding wire.
Mo: be a kind of effective intensified element, and the effect of refinement ferrite crystal grain is arranged, improve the weld seam heat treatment performance, but too high Mo can reduce the toughness of weld seam.The weight percent content of Mo is 0.40～0.80% in the welding wire.
Cu content is within the specific limits the time, can solid solution in weld seam, improve weld strength and toughness.When its content is low, act on similar with nickel, raising weld strength and toughness; When content is higher, increase the tendency of copper brittleness.In addition, a certain amount of copper is conducive to improve the weld seam corrosion resistance, improves the ability that opposing was lost efficacy.It is better when Cu content is 0.20～0.40% in the welding wire.
Ti: the Ti of trace is conducive to form fine Ti compound in weld seam, and refinement weld grain, its content are 0.05～0.15%.
Among the present invention, the same P of Als, S equally are control element, so that weld seam maintains higher impact flexibility, it is controlled at 0.015%.
CE: because alloying element is more, and the content range of alloying element is wider, in order accurately to control the welding wire intensity rank, CE is controlled at 0.70～0.85.
Carbon equivalent (CE) was only for assessment of the tendency of hardenability of steel grade in the past, the rare report of the application in welding wire.Indivedual document analysises the weld seam CE of tensile strength below 700 MPas and the relation of weld seam tensile strength, there is no the people for the research of the CE of more high-intensity weld seam and application and relate to.The present patent application is by test, and CE is used for the population equilibrium of each composition of welding wire of tensile strength 900 MPa levels, stablize drawing welding wire technique, reducing weld strength and fluctuate and produced good effect.
The present invention compared with prior art provides a kind of superelevation strong gas shield welding wire.Adopt little vacuum drying oven to smelt, process stabilizing, steel is pure.In the smelting of welding wire steel, control each element and carbon equivalent ce in scope of design, weld strength is higher than 900MPa, and welding seam toughness reaches-20 ℃ of KV
2More than the 27J.Compare with existing Japanese welding wire, the content of noble element Ni, Mo and Cr is lower, adds the addition of C u, does not add V or Nb, Al.Through the test welding, respond well.This welding wire as-welded microstructure and weld heat-affected zone tissue are martensite and add bainite, and each position of multilayer weld is organized comparatively even; Impact fracture is take the dimple shape as main, and the present invention will provide for the application of China's super-high strength steel the welding material of coupling, and promotes the development of China's super-high strength steel wlding.
The specific embodiment
The below does detailed description:
During experiment, employing be that the 50kg vacuum drying oven is smelted, for the benefit of improve uniformity and the degree of purity of steel ingot, and the employing electromagnetic agitation, selecting low S, P scrap smelting, Ni, Cu and Mo allocate at when filling with substance, Cr added in refining period, and active trace element adds in the later stage or in ladle.Smelt and adopt Si iron and the deoxidation of Mn iron and vacuum deaeration, and strictly control trace element and gas content, casting ingot-forming.Wire rod is wanted blunting of attention heating square billet before rolling.Wire rod is made the finished product welding wire through techniques such as pickling, cleaning, oven dry, wire drawing, recrystallization annealing, water tank wire drawing, copper facing front surface pickling processes, cleaning, copper facing.
The component, weight percent of smelting six stoves when component and the weight percent of Comparative Examples is listed such as table 1;
Table 2 is butt welded seam and the tabulation of deposited metal Impulse Test Result;
Table 3 is the tabulation of butt welded seam stretch test result.
The experimental condition of table 2 and table 3:
Adopt 20%CO
2+ 80%Ar carries out gas shielded arc welding deposited metal soldering test and docking test, and welding technological properties is good.Wherein 1,2, No. 3 sample is 6mm steel plate (grade of steel is 900MPa) docking test, square groove, and heat input is about 16kJ/cm; 4,5 and No. 6 samples carry out with reference to the GB/T8110 standard for the welding deposited metal test specimen.Sample is dissected processing, and carry out the tests such as weld seam stretching, impact.
Each embodiment of table 1 and Comparative Examples welding wire chemical composition (wt%)
Annotate: N≤0.005% in 1～No. 6 welding wire.
Table 2 weld seam and deposited metal Impulse Test Result
| Test piece number (Test pc No.) | 20℃ | -30℃ | -40℃ | -50℃ |
| 1 | 52 51 57(53) | 45 46 43(45) | / | 51 38 43(44) |
| 2 | 33 46 45(41) | 38 35 42(38) | / | 40 22 22(28) |
| 3 | 46 43 50(46) | 46 45 47(46) | / | 40 45 37(41) |
| 4 | 43 55 42(47) | / | 31 43 44 45 50(44) | 25 34 34 38 40(35) |
| 5 | 78 69 80(76) | / | 50 53 62 68 70(61) | 41 46 52 63 65(54) |
| 6 | 87 98 87(91) | / | 73 74 75 77 85(75) | 73 67 88 73(75) |
| Comparative Examples 1 | / | / | 34 42 48(41) | / |
| Comparative Examples 2 | / | / | 45 53 55(51) | / |
Annotate: be in (1) bracket mean value (five values get centre three values); (2) 1,2 and No. 3 sample is of a size of 5 * 10 * 55 (mm).
Table 3 weld seam stretch test result
| Numbering | Specification/mm | Rm(MPa) | A(％) | Z(％) |
| 1 | Φ6 | 920 | 18.0 | 64.0 |
| 2 | Φ6 | 1040 | 17.0 | 57.5 |
| 3 | Φ6 | 960 | 14.5 | 55.0 |
| 4 | Φ10 | 1010 | 13.5 | 52.0 |
| 5 | Φ10 | 960 | 15.0 | 63.0 |
| 6 | Φ10 | 950 | 17.0 | 65.0 |
| Comparative Examples 1 | Φ10 | 960 | 14.0 | 55.0 |
| Comparative Examples 2 | Φ10 | 940 | 15.0 | 56.0 |
Can find out that from table 2 and table 3 it is good that the present invention tests welding effect, satisfy the welding performance requirement of 900MPa level ultrafort steel fully, obdurability has preferably coupling;
Analyzed tissue and the weld heat-affected zone tissue of as-welded metal in the weld metal, this welding wire as-welded microstructure and weld heat-affected zone tissue are martensite and add bainite, and each position of multilayer weld is organized comparatively even; The impact fracture is analyzed, and fracture is take the dimple shape as main.Inhomogeneous and the fracture of Comparative Examples seam organization is take the cleavage shape as main.By contrast, this welding wire has better performance.
Claims (1)
1. the gas protecting welding wire of a tensile strength 900MPa level, its component and percentage by weight are: C:0.06 ~ 0.10%, Si:0.40 ~ 0.60%, Mn:1.60 ~ 1.90%, P≤0.020%, S≤0.020%, Ni:2.40 ~ 3.00%, Cr:0.40 ~ 0.69%, Mo:0.40 ~ 0.80%, Cu:0.20 ~ 0.40%, Ti:0.09 ~ 0.15%, N≤0.005%, Als≤0.015%, all the other are Fe and inevitable impurity; Welding wire carbon equivalent ce: 0.70 ~ 0.85, CE=C+Mn/6+ (Ni+Cu)/15+ (Cr+Mo+V)/5.
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| CN102152025B true CN102152025B (en) | 2013-01-09 |
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| CN104227264B (en) * | 2013-06-21 | 2016-08-10 | 日铁住金溶接工业株式会社 | The surface treatment oil for solid wire for gas shielded arc welding of high strength steel |
| CN104722949A (en) * | 2015-02-02 | 2015-06-24 | 温州大学 | Solid-core welding wire for reducing welding residual stress of high-strength steel |
| CN106808106B (en) * | 2015-12-02 | 2019-04-26 | 鞍钢股份有限公司 | A kind of 960MPa grade high-strength metal powder type medicine core gas shield welding wire |
| CN107662064A (en) * | 2017-11-16 | 2018-02-06 | 天津大桥焊材集团有限公司 | A kind of 900MPa levels welding Shielding Solid Welding Wire |
| CN108788518A (en) * | 2018-07-26 | 2018-11-13 | 钢铁研究总院 | Antidetonation is anti-corrosion fire-resistive construction structural steel grade gas shielded welding wires of 690MPa |
| CN111673313A (en) * | 2020-06-04 | 2020-09-18 | 江苏省沙钢钢铁研究院有限公司 | Gas shielded welding wire with fire-resistant and weather-resistant characteristics |
| CN112935628A (en) * | 2021-02-05 | 2021-06-11 | 天津市金桥焊材集团股份有限公司 | 1000 MPa-level ultrahigh-strength high-toughness gas-shielded solid welding wire |
| CN112935629A (en) * | 2021-02-09 | 2021-06-11 | 天津市金桥焊材集团股份有限公司 | High-strength solid welding wire special for 100kg grade T/P960E steel pipe |
| CN115302126A (en) * | 2022-10-12 | 2022-11-08 | 中国科学院金属研究所 | Jepa-grade high-strength high-toughness argon tungsten-arc welding material for ocean engineering and application thereof |
| CN115369330B (en) * | 2022-10-24 | 2023-03-24 | 张家港荣盛特钢有限公司 | 90-kilogram gas shielded welding wire with high welding performance and preparation method thereof |
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| JPS60158995A (en) * | 1984-01-30 | 1985-08-20 | Kobe Steel Ltd | Mig welding wire for high-tension steel |
| JP5202862B2 (en) * | 2007-03-28 | 2013-06-05 | Ｊｆｅスチール株式会社 | High-strength welded steel pipe with weld metal having excellent cold cracking resistance and method for producing the same |
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|---|---|---|---|---|
| CN101244495A (en) * | 2008-03-07 | 2008-08-20 | 金秋生 | Welding wire for 90 kilogram grade low welding crack sensibility high-strength steel plate |
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| CN101987403A (en) * | 2010-12-09 | 2011-03-23 | 沈阳航空航天大学 | 900MPa-level high-performance gas shielded welding wire |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
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