CN104923967A - High-strength and high-toughness gas shielded welding wire and weld metal capable of being free of pre-heating - Google Patents

High-strength and high-toughness gas shielded welding wire and weld metal capable of being free of pre-heating Download PDF

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Publication number
CN104923967A
CN104923967A CN201510354418.7A CN201510354418A CN104923967A CN 104923967 A CN104923967 A CN 104923967A CN 201510354418 A CN201510354418 A CN 201510354418A CN 104923967 A CN104923967 A CN 104923967A
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weld metal
strength
welding wire
weld
welding
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CN104923967B (en
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张宇
董利明
郭慧英
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Jiangsu Shagang Iron and Steel Research Institute Co Ltd
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Jiangsu Shagang Iron and Steel Research Institute Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/308—Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The invention discloses a high-strength and high-toughness gas shielded welding wire and weld metal capable of being free of pre-heating. The gas shielded welding wire comprises, by weight, the chemical components of C 0.03%-0.07%, Si 0.25%-0.45%, Mn 0.60%-1.10%, S<=0.01%, P<=0.01%, Ni 7.0%-12.0%, Cr 17%-21%, Ti 0.10%-0.25% and the balance being Fe and impurity elements. By the adoption of mixed gas shielded welding, the obtained weld metal is composed of martensite, acicular bainite and retained austenite, the tensile strength of the weld metal is larger than or equal to 1,000 MPa, the yield strength of the weld metal is larger than or equal to 830 MPa, and the impact work of the weld metal is larger than or equal to 47 J at the temperature of -40 DEG C. As the weld metal is capable of being free of pre-heating before welding and heat treatment after welding, the retained austenite in the weld metal lowers cold crack sensitivity after welding by absorbing diffusible hydrogen, and the acicular bainite in the weld metal effectively improves the low-temperature toughness of the weld metal.

Description

High-strength and high ductility gas shield welding wire and the weld metal of preheating can be exempted
Technical field
The invention belongs to technical field of welding materials, relate to a kind of high-strength and high ductility gas shield welding wire and the weld metal of exempting preheating, particularly relate to a kind of the gaseous mixture shield welding wire and the weld metal that are applicable to 1000MPa grade high-strength degree steel plate.
Background technology
In recent years, engineering machinery pump truck and arm, hydroelectric project penstocks and coal mine machinery hydraulic support etc. have employed the high strength steel of tensile strength 800 ~ 1000MPa one after another, to improve bearing capacity and the combination property of structure member.Generally, the usual demand fulfillment of such steel plate-20 DEG C of ballistic works are greater than the requirement of 47J.Such steel plate adopts controlled rolling and controlled cooling and heat treated production technology usually, and microstructure is based on tempered martensite; For guaranteeing mechanical property and welding performance, then adopt low-carbon (LC) and low-alloyed design principle, to reduce weld preheating temperature.
Such ultrahigh-strength steel plates be unable to do without assemble welding in commercial Application, but domesticly there is no special coupling welding material.The welding wire mentioned in patent CN101244495A and CN101987403A all can not meet the technical requirement of 1000MPa.Patent CN102626836A refer to one and is suitable for tungsten electrode argon shield weldering welding solid core welding wire; adopt this welding wire to weld, can obtain full martensite weld metal, its yield strength is at more than 850MPa; tensile strength is at more than 1050MPa, and-20 DEG C of ballistic works are at more than 25J.Although intensity and toughness meet the demands, because weld metal is martensitic structure, postwelding cool attenuation is large, and easily crack, need weld preheating process, efficiency is low.For above-mentioned shortcoming; patent document JP 2013-86134 achieves martensite and austenitic weld seam organization design by the careful design of Cr and Ni alloying element; thus the inert gas-shielded arc welding realizing exempting preheating connects; and more than the tensile strength 950MPa of weld metal; but this welding wire and weld metal all connect for inert gas-shielded arc welding; cost is high, and efficiency is low.
Said method all adopts Control for Oxygen Content in inert gas-shielded arc welding welding seam metal in 50ppm, to meet low-temperature impact toughness requirement.But after adopting mixed gas arc welding, the oxygen content of weld metal will be increased between 100 ~ 450ppm from below 50ppm, can not meet the low-temperature flexibility energy requirement of weld metal.
Summary of the invention
For the deficiency that prior art exists, the object of the present invention is to provide a kind of high-strength and high ductility gas shield welding wire and the weld metal of exempting preheating, be applicable to mixed gas arc welding, weld preheating process can be exempted, meet superhigh intensity requirement.
For achieving the above object, the present invention adopts following technical scheme:
The high-strength and high ductility gas shield welding wire of preheating can be exempted, in percentage by weight for chemical composition be: C0.03 ~ 0.07%, Si 0.25 ~ 0.45%, Mn 0.60 ~ 1.10%, S≤0.01%, P≤0.01%, Ni 7.0 ~ 12.0%, Cr 17 ~ 21%, Ti 0.10 ~ 0.25%, surplus is Fe and impurity element.
Further, the high-strength and high ductility gas shield welding wire of the described preheating exempted is applicable to gaseous mixture and protects weldering, and protective atmosphere need select the mist of the inert gas containing 95% or more ratio, thermal weld stress amount 5 ~ 18kJ/cm.
The weld metal obtained after can exempting the high-strength and high ductility gas shield welding wire welding of preheating, in percentage by weight for chemical composition be: C 0.03 ~ 0.07%, Si 0.25 ~ 0.45%, Mn 0.60 ~ 1.10%, S≤0.01%, P≤0.01%, Ni 7.0 ~ 12.0%, Cr 17 ~ 21%, Ti 0.05 ~ 0.25%, O 0.01 ~ 0.04%, remaining is Fe and impurity element; And Cr≤0.6Ni+12, Ceq 4.0 ~ 4.5, wherein Ceq=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4.
Further, described weld metal is made up of martensite, acicular bainite and retained austenite, and wherein the volume content of acicular ferrite and retained austenite is between 15 ~ 30%.
Further, the yield strength >=830MPa of described weld metal, tensile strength >=1000MPa ,-40 DEG C of ballistic work >=47J.
Element in welding wire and weld metal adds reason, and details are as follows:
C: suitable C content is the key factor ensureing weld strength, and therefore C content is unsuitable too low, but too high C content can worsen weldability, increases cold cracking inclination, so C content is also unsuitable too high; The upper bainite worsening weld metal impact flexibility organizes all higher with local C content relevant with Ma Ao island.Therefore, preferably its content is 0.03-0.07%.
Si: be element indispensable in gas shield welding wire and weld metal.Be the deoxidant element in weld metal on the one hand, effectively can be improved the intensity of weld metal on the other hand by solution strengthening.But in the present invention, be the adverse effect preventing excessive Si from adding Resistance of Weld Metal toughness, preferably its content is 0.25-0.45%.
Mn: be that effective intensity increases element and deoxidant element in weld seam, be conducive to refinement seam organization.But too high Mn content can make welding seam toughness reduce, and increases the crack sensitivity of weld seam, therefore preferably Mn content is 0.60 ~ 1.10%.
Ni: mainly utilize its malleableize ferrite matrix principle to improve the impact flexibility of weld metal, also utilizes it to increase quenching degree to improve weld metal intensity simultaneously; But too high Ni content can reduce the mobility of weld metal, it is unfavorable that butt welded seam is shaped, and also easily causes the defects such as weld seam slag inclusion and pore.
In addition, from three organizational controls angles of weld metal, when its content >=7.0%, just can guarantee have retained austenite to exist in weld metal.Therefore, preferably its content is 7.0 ~ 12.0%.
Cr: coordinate for Ni and carry out microstructures of weld metals control, in above-mentioned Ni content range, the preferred content of Cr is 17.0 ~ 21.0%, and Cr≤0.6Ni+12.
Ti: be one of most important element in the present invention, what be mainly used to be formed tiny, fine and close distribution in a large number contains Ti oxide particle, thus form a certain proportion of acicular bainite tissue by the heterogeneous forming core of intracrystalline, thus improve the low-temperature impact toughness of weld metal.
O: carry out deoxygenation with Ti, generate the oxide particle containing Ti.
Existing result shows, is produced by the content of Ti and O determine impact to the size, volume content etc. of its final reacting product.When ratio is suitable, oxide particle that is a large amount of, tiny and the distribution in dense uniform can be formed, and be not easy agglomeration.These, in the existence of fine and close distribution, undersized high-melting-point particle, will become heterogeneous forming core particle and healthy hair acicular bainite forming core at weld metal, then just martensite transfor mation can occur in the cold process of postwelding.The acicular bainite of oxide particle inductive formation improves the toughness of weld metal on the one hand, on the other hand also can the martensitic structure that generates subsequently of refinement, also can be useful to toughness.
Therefore, should control Ti content be 0.10 ~ 0.25%, control O content be 0.01 ~ 0.04%.The low-temperature flexibility of S, P butt welded seam is unfavorable, should should control at zone of reasonableness as impurity element, in the present invention, controls its content S≤0.01%, P≤0.01%.
Beneficial effect of the present invention:
1. the present invention adopts the heterogeneous weld structure design of CrNiTi alloy designs and martensite, acicular bainite and retained austenite, makes welding procedure that gaseous mixture can be adopted to protect weldering.
2. the weld structure design of heterogeneous structure improves the low-temperature impact toughness of weld metal, adopts gaseous mixture to protect the yield strength >=850MPa welding the weld metal obtained, tensile strength >=1000MPa, its-40 DEG C ballistic work >=100J.
3. the weld metal design of the three-phase structure of martensite, acicular bainite and retained austenite can exempt weld preheating and post weld heat treatment, retained austenite in weld metal reduces postwelding cool attenuation by absorbing diffusible hydrogen, and the acicular bainite in weld metal effectively improves the low-temperature flexibility of weld metal.
Detailed description of the invention
Below in conjunction with preferred embodiment, technical scheme of the present invention is further described.
Through smelting into steel ingot, heating furnace heating put into by smelting steel billet, high speed no-twist mill is rolled into wire rod.Wire rod through peeling off, to make diameter be 0.8 ~ 1.6mm finished product welding wire for pickling, drawing, copper facing.
1000MPa level steel plate carries out the welds prepares such as groove, adopts the mist containing more than 95% grade ratio inert gas as the welding of protective atmosphere, thermal weld stress amount 5 ~ 18kJ/cm, namely make welding point and weld metal.
Embodiment 1:
Adopt said method obtain diameter 1.2mm gas shield welding wire, in percentage by weight for chemical composition be: C 0.05%, Si 0.32%, Mn 0.76%, S 0.005%, P 0.009%, Ni 8.80%, Cr 18.7%, Ti0.16%, all the other are Fe and impurity element.
Adopt 95%Ar+5%CO 2mist as protective atmosphere, heat input is 9kJ/cm.Select that 8mm is thick, the steel plate of tensile strength 1150MPa as mother metal, adopt one side double V-groove, bevel angle is 55 °, does not swing, without preheating and post weld heat treatment.Postwelding does not find the defect such as crackle, incomplete fusion through nondestructive testing and structure observation.
The chemical composition of weld metal is: C 0.06%, Si 0.28%, Mn 0.96%, S 0.004%, P 0.006%, Ni 8.2%, Cr 17.4%, Ti 0.12%, O 0.024%, and all the other are Fe and impurity element, and Ceq 4.1,
Through inspection, the yield strength of weld metal is 868MPa, and tensile strength is 1037MPa ,-40 DEG C of ballistic work 126J.Weld metal is made up of martensite, acicular bainite and a small amount of retained austenite, and the volume content of acicular bainite and retained austenite is 24%.
Embodiment 2:
Adopt said method obtain diameter 1.0mm gas shield welding wire, in percentage by weight for chemical composition be: C 0.07%, Si 0.28%, Mn 0.92%, S 0.004%, P 0.007%, Ni 11.4%, Cr 18.2%, Ti0.14%, all the other are Fe and impurity element.
Adopt 98%Ar+2%O 2mist as protective atmosphere, heat input is 5kJ/cm.Select that 6mm is thick, the steel plate of tensile strength 1076MPa as mother metal, adopt one side double V-groove, bevel angle is 55 °, does not swing, without preheating and post weld heat treatment.Postwelding does not find the defect such as crackle, incomplete fusion through nondestructive testing and structure observation.
The chemical composition of weld metal is: C 0.06%, Si 0.28%, Mn 0.85%, S 0.003%, P 0.005%, Ni 10.8%, Cr 17.6%, Ti 0.11%, O 0.018%, and all the other are Fe and impurity element, and Ceq 4.2.
Through inspection, the yield strength of weld metal is 862MPa, and tensile strength is 1053MPa ,-40 DEG C of ballistic work 118J.Weld metal is made up of martensite, acicular bainite and a small amount of retained austenite, and the volume content of acicular bainite and retained austenite is 18%.
Embodiment 3:
Adopt said method obtain diameter 1.2mm gas shield welding wire, in percentage by weight for chemical composition be: C 0.06%, Si 0.42%, Mn 1.05%, S 0.003%, P 0.006%, Ni 8.6%, Cr 20.6%, Ti0.22%, all the other are Fe and impurity element.
Adopt 95%Ar+5%CO 2mist as protective atmosphere, heat input is 14kJ/cm.Select that 16mm is thick, the steel plate of tensile strength 1088MPa as mother metal, adopt two-sided double V-groove, bevel angle is 45 °, without preheating and post weld heat treatment.Postwelding does not find the defect such as crackle, incomplete fusion through nondestructive testing and structure observation.
The chemical composition of weld metal is: C 0.06%, Si 0.36%, Mn 0.96%, S 0.003%, P 0.005%, Ni 8.2%, Cr 19.4%, Ti 0.18%, O 0.036%, and all the other are Fe and impurity element, and Ceq 4.3.
Through inspection, the yield strength of weld metal is 856MPa, and tensile strength is 1042MPa ,-40 DEG C of ballistic work 104J.Weld metal is made up of martensite, acicular bainite and a small amount of retained austenite, and the volume content of acicular bainite and retained austenite is 26%.
Known by above-described embodiment; the high-strength and high ductility gas shield welding wire that the present invention can exempt preheating protects weldering for gaseous mixture; protective atmosphere selects the mist of the inert gas containing 95% or more ratio; sweating heat enters amount 5-18kJ/cm; yield strength >=850MPa can be obtained; the high-strength and high ductility weld metal of tensile strength >=1000MPa ,-40 DEG C of ballistic work >=100J.
The above embodiment only have expressed the specific embodiment of the present invention, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.Those skilled in the art all drops in protection scope of the present invention any variation that the present invention does under the enlightenment that the present invention conceives.

Claims (5)

1. can exempt the high-strength and high ductility gas shield welding wire of preheating, it is characterized in that: in percentage by weight for chemical composition be: C 0.03 ~ 0.07%, Si 0.25 ~ 0.45%, Mn 0.60 ~ 1.10%, S≤0.01%, P≤0.01%, Ni 7.0 ~ 12.0%, Cr 17 ~ 21%, Ti 0.10 ~ 0.25%, surplus is Fe and impurity element.
2. the high-strength and high ductility gas shield welding wire exempting preheating according to claim 1; it is characterized in that: described gas shield welding wire is applicable to gaseous mixture and protects weldering; protective atmosphere selects the mist of the inert gas containing 95% or more ratio, thermal weld stress amount 5 ~ 18kJ/cm.
3. a weld metal, it is characterized in that: in percentage by weight for chemical composition be: C0.03 ~ 0.07%, Si 0.25 ~ 0.45%, Mn 0.60 ~ 1.10%, S≤0.01%, P≤0.01%, Ni 7.0 ~ 12.0%, Cr 17 ~ 21%, Ti 0.05 ~ 0.25%, O 0.01 ~ 0.04%, remaining is Fe and impurity element; And Cr≤0.6Ni+12, Ceq 4.0 ~ 4.5, wherein Ceq=C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4.
4. weld metal according to claim 3, is characterized in that: weld seam is made up of martensite, acicular bainite and retained austenite, and wherein the volume content of acicular ferrite and retained austenite is between 15 ~ 30%.
5. the weld metal according to claim 3 or 4, is characterized in that: the yield strength >=830MPa of weld metal, tensile strength >=1000MPa ,-40 DEG C of ballistic work >=47J.
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CN106312372A (en) * 2016-11-23 2017-01-11 四川西冶新材料股份有限公司 Gas protection solid welding wire for 1000 MPa high-strength steel welding and preparing and welding methods of gas protection solid welding wire
CN106563888A (en) * 2015-10-10 2017-04-19 丹阳市华龙特钢有限公司 High-cost-performance submerged-arc welding wire and producing method thereof
CN108015450A (en) * 2017-11-30 2018-05-11 钢铁研究总院 One kind is used for reactor supporting structure steel gas shield welding wire
CN108500508A (en) * 2018-03-16 2018-09-07 上海连山金属材料有限公司 A kind of 770MPa grades of high-strength steel preheating-free gas protecting welding wire
CN111571062A (en) * 2020-05-26 2020-08-25 哈尔滨焊接研究院有限公司 Low alloy steel gas shielded welding wire for 800 MPa-level welding
CN111872561A (en) * 2020-06-10 2020-11-03 中国兵器科学研究院宁波分院 Welding joint and welding method of low-alloy ultrahigh-strength steel
CN115302128A (en) * 2022-10-12 2022-11-08 中国科学院金属研究所 Gippel-grade low-temperature high-toughness consumable electrode gas shielded welding material for ocean engineering and application thereof

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CN108500508A (en) * 2018-03-16 2018-09-07 上海连山金属材料有限公司 A kind of 770MPa grades of high-strength steel preheating-free gas protecting welding wire
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CN111872561A (en) * 2020-06-10 2020-11-03 中国兵器科学研究院宁波分院 Welding joint and welding method of low-alloy ultrahigh-strength steel
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CN115302128A (en) * 2022-10-12 2022-11-08 中国科学院金属研究所 Gippel-grade low-temperature high-toughness consumable electrode gas shielded welding material for ocean engineering and application thereof
CN115302128B (en) * 2022-10-12 2022-12-13 中国科学院金属研究所 Gipah-grade low-temperature high-toughness consumable electrode gas shielded welding material for ocean engineering and application thereof

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