CN101157164B - Gas coverage arc welding compound core solder wire for steel with high tension - Google Patents

Gas coverage arc welding compound core solder wire for steel with high tension Download PDF

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Publication number
CN101157164B
CN101157164B CN 200710141172 CN200710141172A CN101157164B CN 101157164 B CN101157164 B CN 101157164B CN 200710141172 CN200710141172 CN 200710141172 CN 200710141172 A CN200710141172 A CN 200710141172A CN 101157164 B CN101157164 B CN 101157164B
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mass
welding
wt
mgo
ti02
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CN 200710141172
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CN101157164A (en
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冈崎喜臣
日高武史
末永和之
石田齐
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株式会社神户制钢所
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Priority to JP2006271314A priority patent/JP5005309B2/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053Fe as the principal constituent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261Rods, electrodes, wires
    • B23K35/0266Rods, electrodes, wires flux-cored
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3602Carbonates, basic oxides or hydroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3603Halide salts
    • B23K35/3605Fluorides

Abstract

A flux-cored wire for gas-shielded arc welding which contains in its total weight C: 0.02 to 0.14 wt%, Si: 0.4 to 1.1 wt%, Mn: 0.8 to 3.0 wt%, Ni: 0.2 to 3.1 wt%, Ti: no more than 0.2 wt%, either or both of Cr and Mo: 0.1 to 4.0 wt% in total, TiO2 and MgO: 5.0 to 7.2 wt% in total, N: no more than 0.0150 wt%, optionally any or all of alkali metal fluoride and oxide, alkaline earth metal fluoride and oxide, B, Al, and Mg: no more than 2.0 wt% in total, with the remainder being inevitable impurities and Fe, wherein the content of MgO and the content of Ti02 satisfy the equation: 0.05 0.22 (wherex denotes the ratio of MgO/Ti02). The flux-cored wire has good welding usability and gives weld metal superior in low-temperature toughness (at about -60 degree C) and cold crack resistance when applied to high-tensile strength steel having a proof strength greater than 620 MPa.

Description

高张力钢用气体保护弧焊药芯焊丝 High-tensile steel with gas shielded arc welding flux cored

技术领域 FIELD

[0001] 本发明涉及使用于屈服点为620MPa级以上的高张力钢的气体保护弧焊中的适用的药芯焊丝(flux-cored wire),特别是涉及能够得到低温韧性优异的焊接金属,在全部焊接姿势的焊接作业性及耐裂纹性都优异的高张力钢用气体保护弧焊药芯焊丝。 [0001] The present invention relates to a flux cored wire suitable yield point (flux-cored wire) of more than 620MPa grade high-tensile steel gas shielded arc welding in particular relates to a superior low temperature toughness can be obtained weld metal, in all welding posture of the welding operation and are excellent in the crack resistance of high-tensile steel with gas shielded arc welding flux cored wire.

背景技术 Background technique

[0002] 伴随着近来的钢结构物的大型化,而方图实现结构物的轻量化,为此,推进了高张力钢在钢结构物上的应用。 [0002] With the recent large-scale steel structures of, and square in FIG weight reduction of the structure, for this purpose, to promote the application of high-tensile steel in the steel structure. 特别是在海洋结构物及压力容器等的领域,需要钢结构物有良好的低温韧性,对满足这一点的焊接材料的需求迫切。 Especially in the field of marine structures and pressure vessels or the like, the steel structure requires a good low temperature toughness, it satisfies the urgent need for welding materials. 至今为止的现状是,在气体保护金属极电弧焊和潜弧焊等之中,都应用低温韧性优异的焊接材料,但是在作业效率、焊接作业性及适用姿势等方面仍存在课题。 Until now the status quo is, in gas metal arc welding and submerged arc welding, etc. among all applications excellent low-temperature toughness of the material, but still there is a problem in terms of operating efficiency, welding workability and suitable posture. 为此,就迫切要求高效率、优选的低温韧性及全部焊接姿势下都有良好的焊接作业性这3个特性均优异的药芯焊丝。 For this reason, there is an urgent requirement at high efficiency, the low-temperature toughness and all have good welding posture of the welding operation these three properties are excellent in flux cored wire.

[0003] 作为如此高性能的药芯焊丝,已开发有几种。 [0003] As such a high performance wire, it has been developed in several ways. 作为一例,在特开平9-253886号公 As an example, Laid-Open No. 9-253886 well

报中公开有一种抗拉强度为690MPa级的高张力钢用的气体保护弧焊药芯焊丝,该药芯焊 Datagram discloses a gas shielded arc welding flux cored wire for the tensile strength of 690MPa grade high-tensile steel with the drug core welding

丝是相对于焊丝整体重量,规定TiOy金属氟化物、C、 Si、 Mn、 Ni、 Cr、 Mo、 Cu、 Mg、 Ti及B的 Wire with respect to the overall weight of the wire, a predetermined TiOy metal fluoride, C, Si, Mn, Ni, Cr, Mo, Cu, Mg, Ti and B

含量,和焊丝中的Mg量/金属氟化物量比的适当范围,以确保良好的焊接作业性和长时间 Content, and the appropriate range of the Mg content of the wire / metal ratio of fluoride, to ensure good welding workability and long

PWHT(焊接后热处理:Post Weld Heat Treatment)后的高温强度及低温韧性。 PWHT (post weld heat treatment: Post Weld Heat Treatment) after high-temperature strength and low temperature toughness.

[0004] 另外,特开平3-047695号公报中公开了一种填充有以Ti02、 MgO及MnO为主成分 [0004] Further, JP-A-3-047695 discloses a to be filled with Ti02, MgO, and MnO as main components

的二氧化钛系焊剂的高张力钢用药芯焊丝。 Titania-based flux cored wire with high tensile steel. 该现有技术通过规定高张力钢用药芯焊丝的C、 The prior art through the provision of high-tensile steel flux-cored wire C,

Mn、 Ni及Mo的含量,并使Ti02/MgO比最佳化以及添加Co和Cr,从而确保良好的焊接作业 Mn, Ni and Mo content, and Ti02 / MgO ratio optimization, and adding Co and Cr, in order to ensure a good welding operation

性及韧性。 And toughness.

[0005] 另外,在特开平8-174275号公报中,公开有一种抗拉强度为680N/mm2级以上的高张力钢用的气体保护弧焊药芯焊丝。 [0005] Further, in JP 8-174275, discloses a gas shielded arc welding flux cored wire tensile strength of more than 680N / mm2 grade high-tensile steel used. 该现有技术是通过相对于焊丝整体重量,规定C、 Si、Mn、 P、 S、 Ni、 Cr及Mo的含量的适当范围,并规定Ta的添加量,从而在低热能至高热能的广泛使用范围中确保相当于母材强度的强度及良好的韧性,此外为了提高作业效率,而规定焊剂中的金属粉的重量比率。 The prior art with respect to the wire by total weight, a predetermined proper range C, Si, Mn, P, S content, Ni, Cr and Mo, and a predetermined amount of Ta added is widely used in low-calorie and thus a high heat range corresponds to ensure the strength of the base material strength and good toughness, in addition to improve operating efficiency, and a predetermined weight ratio of the metal powder in the flux.

[0006] 此外在特开平3-294093号公报中是关于一种二氧化钛系的气体保护弧焊用药芯 [0006] Further is cored gas shielded arc welding of titanium dioxide relates to a system in the JP 3-294093

焊丝,其提出这样一种方法,通过对于该药芯焊丝添加MgO及金属氟化物,以促进来自熔融 Wire, which proposes a method, and a metal fluoride by adding MgO to the wire, from the molten to facilitate

金属的熔渣的浮上分离,降低焊接金属中的氧量,从而改善焊接金属的低温韧性。 Metallic floatation slag, reducing the amount of oxygen in the weld metal, thereby improving the low temperature toughness of the weld metal.

[0007] 然而,在上述的各现有技术中,因为会根据-30〜-401:的摆锤冲击值评价低温韧 [0007] However, in the above-described prior art, because based -30 ~ -401: Evaluation of low temperature toughness of the Charpy impact value

性,所以其目的还在于确保-30〜-4(TC左右的低温韧性。然而,如果考虑应用到海洋结 Resistance, it also aims to ensure the low temperature toughness of about -30~-4 (TC. However, in consideration of application to marine junction

构物等在极低温下使用的结构物上,则在上述温度域得到的高韧性仍不充分,而是需要确 The structure for use at a very low temperature configuration and the like, it is still insufficient in the above temperature range to obtain a high toughness, but the need to ensure

保-e(rc左右的极低温域下的高韧性。 Paul -e (about rc high toughness at cryogenic temperature domain.

[0008] 另外,在特开平9-253886号公报及特开平8-174275号公报所公开的技术中,并没有公开对于二氧化钛系焊剂添加Mg0带来的作用效果。 [0008] Further, in the technique and JP Laid-Open No. 9-253886 Publication Laid-Open No. 8-174275 disclosed, and no disclosure of the effects brought Mg0 added to the titania-based flux. 此外,在特开平3-294093号公报中,也没有将全部焊接姿势下的焊接作业性的提高作为课题,另外在由同一文献规定的Ti02/Mg0比,向上立焊中的焊缝(bead)形状不良。 Further, in JP 3-294093, it is also not a problem to increase the welding workability at all the welding posture, in addition Ti02 / Mg0 ratio defined by the same document, in the vertical upward welding seam (a bead) bad shape. 因此,在现场焊接不可能由焊接变位机(positioner)等展开焊接处从而变更姿势的大型结构物时,存在此焊丝的应用困难的问题。 Therefore, in the field of welding by the welding can not expand positioner (Positioner) welding and the like so as to change the posture of the large structure, difficulty of application of this wire.

[0009] 在特开平3-047695号公报中,虽然是在150A左右的比较低的电流下评价向上立焊的焊接作业性,以决定Ti02/Mg0比的范围,但是在150A左右的低电流下,以提高焊接施工效率为目的而应用药芯焊丝(FCW)的效果难以取得。 [0009] In JP-A-3-047695, although the welding workability at a relatively low current of about 150A under evaluation vertical upward welding, in order to determine the range of Ti02 / Mg0 ratio, but at the low current of about 150A to improve the efficiency of construction for the purpose of the application of welding flux cored wire (the FCW) effect difficult to obtain. 另一方面,若为了提高焊接施工效率而使用220A左右的高电流,则在特开平3-047695号公报所规定的Ti02/Mg0比下,会发生焊缝形状不良,或者变成不可焊接的可能性极高。 On the other hand, when the construction in order to improve the efficiency of welding using a high current of about 220A, at Ti02 / Mg0 ratio specified Laid Open Publication No. 3-047695, the shape of weld failure may occur, or may become non-weldable extremely high.

[0010] 如此在现有技术中,满足更低的低温域下的韧性确保、全部焊接姿势下的良好的焊接作业性、焊接施工效率提高、优异的耐裂纹性的高张力钢用药芯焊丝尚未取得,强烈要求对其的开发。 [0010] As in the prior art, to meet the lower toughness at low temperature range to ensure good welding workability, the welding work efficiency in all welding positions, excellent cracking resistance of high-tensile steel flux-cored wire Not made, strong demand of its development.

发明内容 SUMMARY

[0011] 本发明鉴于这一问题点而进行,其目的在于提供这样一种高张力钢用气体保护弧焊药芯焊丝,其在屈服点620MPa级以上的高张力钢的焊接中,能够在-6(TC左右得到低温韧性优异的焊接金属,另外在全部焊接姿势都能够确保良好的焊接作业,焊接施工效率提高,且焊接金属的耐裂纹性优异。 [0011] In view of this problem the present invention is carried out, and its object is to provide a high-tensile steel with gas shielded arc welding flux cored wire, which is above the yield point of 620MPa grade high-tensile steel welding, it is possible - about 6 (TC obtain superior low temperature toughness of the weld metal, all further welding posture can ensure good welding work, welding work efficiency is improved, and crack resistance of the weld metal is excellent.

[0012] 本发明的另一气体保护弧焊药芯焊丝,其相对于焊丝总质量,含有C:0.02〜0. 14质量%、 Si :0. 4〜1. 1质量%、 Mn :0. 8〜3. 0质量%、 Ni :0. 2〜3. 1质量%、 Ti :0. 2质量%以下、Cr及Mo :以总量计为O. 1〜4. 0质量X,并含有Ti02及MgO以总量计为5. 0〜7.2质量%,此外,还含有碱金属氟化物、碱金属氧化物、碱土类金属氟化物、碱土类金属氧化物、B、 Al及Mg以总量计为2. 0质量X以下,此外,将N规定在0.0150质量%以下,余量由不可避免的杂质和Fe构成。 [0012] Another gas shield arc welding flux cored wire according to the present invention, with respect to the total mass of the wire, comprising C:. 0.02~0 14 mass%, Si:.. 0 4~1 1 mass%, Mn: 0. . 8~3 0 mass%, Ni:.. 0 2~3 1 mass%, Ti: 0 2 mass%, Cr and Mo:. in terms of total mass O. 1~4 0 X, and contains. Ti02 and MgO in total amount 0~7.2 5% by mass, in addition, also contains an alkali metal fluoride, alkali metal oxides, alkaline earth metal fluoride, alkaline earth metal oxide, B, Al and Mg in a total amount X 2.0 in terms of mass or less, in addition, at the N predetermined 0.0150 mass% or less, the balance consisting of unavoidable impurities and Fe.

[0013] 另外,本发明的另一气体保护弧焊药芯焊丝,其相对于焊丝总质量,含有C:0. 02〜0. 14质量X、Si :0. 4〜1. l质量X、Mn :0. 8〜3. 0质量% 、Ni :0. 2〜3. 1质量%、Ti :0. 2质量X以下、Cr及Mo :以总量计为O. 1〜4. 0质量% ,并含有Ti02及MgO以总量计为5. 0〜7. 2质量X,此外,将N规定在0. 0150质量%以下,余量由不可避免的杂质和Fe构成,设MgO的含量和Ti02的含量的比为x( = MgO/Ti02)时,O. 05《x《0. 22。 [0013] Further, another gas shield arc welding flux cored wire according to the present invention, with respect to the total mass of the wire, comprising C:.. 0 02~0 14 mass X, Si:.. 0 4~1 l quality X, mn:.. 0 8~3 0 mass%, Ni:.. 0 2~3 1 mass%, Ti: 0 2 X mass or less, Cr and Mo:. in total amount O. 1~4 0 mass. % and contains Ti02 and MgO in total amount 5. 0 to 7. 2 mass X, in addition, N is the predetermined 0.0150 mass%, the balance being unavoidable impurities and Fe, the content of MgO is provided when the content of Ti02 and the ratio of x (= MgO / Ti02), O. 05 "x" 0. 22. [0014] 另外,本发明的又一气体保护弧焊药芯焊丝,其相对于焊丝总质量,含有C:0. 02〜0. 14质量X、Si :0. 4〜1. l质量X、Mn :0. 8〜3. 0质量% 、Ni :0. 2〜3. 1质量%、Ti :0. 2质量X以下、Cr及Mo :以总量计为O. 1〜4. 0质量% ,并含有Ti02及MgO以总量计为5. 0〜7. 2质量%,此外,还含有碱金属氟化物、碱金属氧化物、碱土类金属氟化物、碱土类金属氧化物、B、A1及Mg以总量计为2. 0质量%以下,此外,将N规定在0. 0150质量%以下,余量由不可避免的杂质和Fe构成,设MgO的含量和Ti02的含量的比为x( = MgO/Ti02)时,O. 05《x《0. 22。 [0014] Further, another gas shield arc welding flux cored wire according to the present invention, with respect to the total mass of the wire, comprising C:.. 0 02~0 14 mass X, Si:.. 0 4~1 l quality X, mn:.. 0 8~3 0 mass%, Ni:.. 0 2~3 1 mass%, Ti: 0 2 X mass or less, Cr and Mo:. in total amount O. 1~4 0 mass. % and contains Ti02 and MgO in total amount 5. 0 to 7. 2 mass%, in addition, also contains an alkali metal fluoride, alkali metal oxides, alkaline earth metal fluoride, alkaline earth metal oxide, B, A1 and Mg is the total amount of 2.0 mass% or less, in addition, N is the predetermined 0.0150 mass%, the balance being composed of Fe and inevitable impurities, provided than the content of MgO and the content of Ti02 as when x (= MgO / Ti02), O. 05 "x" 0. 22.

[0015] 根据本发明能够得到一种焊接金属,即使在-e(rc左右的低温下也能够得到焊接金属的良好的低温韧性,能够得到全部焊接姿势下的优异的焊接作业性及焊接施工效率,耐裂纹性优异。 [0015] The present invention can obtain a weld metal according to, even at a low temperature (about rc -e possible to obtain good low-temperature toughness of the weld metal, it is possible to obtain an excellent welding workability and efficiency of the welding work in all welding posture , is excellent in crack resistance.

4附图说明 BRIEF DESCRIPTION OF 4

[0016] 图1是表示F(x)和vE-6(TC的关系的曲线图。[0017] 图2是表示焊缝形状的评价方法的图。 [0016] FIG. 1 shows a F (x) and vE-6 (graph showing the relationship of the TC. [0017] FIG. 2 is a diagram showing an evaluation method of the shape of the weld.

具体实施方式 Detailed ways

[0018] 以下,对于本发明的实施方式进行具体地说明。 [0018] Hereinafter, embodiments of the present invention will be specifically described. 本发明者等为了使高张力钢用气体保护弧焊药芯焊丝的低温韧性提高,而对于有效的合金成分及熔渣造渣剂进行各种研究,其结果明确了高张力钢用气体保护弧焊药芯焊丝中的合金成分的添加量与焊接金属的低温韧性的关系。 In order to make a high-tensile steel gas shielded arc welding flux cored wire of the low temperature toughness improved, and made various studies for efficient slagging agent slag and alloy composition of the present inventors, as a result of the clear high-tensile steel gas shielded arc relationship between added amount of alloy components in a flux-cored wire welding and the low temperature toughness of the weld metal. 此外,还发现了确保良好的低温韧性及焊接作业性的Ti02量和MgO量的关系。 In addition, also we found the relationship to ensure good low-temperature toughness and Ti02 amount and the amount of MgO workability of welding. 另外,焊接金属的韧性会在合金成分的相互作用下受到影响,因此对于高张力钢用气体保护弧焊药芯焊丝中的各种合金成分给焊接金属的低温韧性造成的影响进行调查,其结果是得出以下的结论。 Further, the toughness of the weld metal is affected by the interaction of the alloy composition, and therefore for the various alloy compositions gas shielded arc welding flux cored wire used in high-tensile steel to low temperature impact toughness of the weld metal caused by the investigation, as a result It is come to the following conclusions.

[0019] 首先,在屈服点620MPa级以上的高张力钢的焊接中,随着高张力钢用气体保护弧焊药芯焊丝中的C、Cr、Ti、Mo的增加而有韧性降低的倾向,特别是因C、Ti的含有带来的影响大。 [0019] First, in the welding of high-tensile steel than the yield point of 620MPa class, as the,, of Mo increases high-tensile steel with gas shielded arc welding flux cored wire in C Cr, Ti has a tendency to decrease in toughness, especially because of C, Ti containing a large impact.

[0020] 由此Ti的添加,焊接金属中的固溶Ti增大,在重新加热部有TiC析出,因此核生成能降低。 [0020] Thus the addition of Ti, solid solution Ti in the weld metal increases, TiC precipitates have a reheating portion, thus nucleation can be reduced. 由此,粗大的板条状的贝氏体成为支配性的组织,韧性大大降低。 Thus, a coarse lath-like bainite becomes dominant tissue, toughness is greatly reduced. 还有,所谓重新加热部是指,焊接金属在后续焊道(后续电极形成的焊道)作用下形成的热影响部。 There, the so-called reheat section means, the heat-affected zone of weld metal is formed in the subsequent bead (bead subsequent electrode formation) effect. 另外,由于C的增加,焊接金属中生成岛状马氏体,韧性劣化。 Further, due to the increase of C, island martensite is generated in the weld metal, the toughness is deteriorated.

[0021] 反之,添加Si、Mn、Ni则有韧性提高的倾向,特别是含有Si和Mn带来的韧性提高效果明显。 [0021] Conversely, adding Si, Mn, of Ni tends to improve the toughness, especially those containing Mn and Si brings toughness improving effect. 通过增加Mn及Si的含量,焊接金属中的氧量被降低,能够确保良好的韧性。 By increasing the content of Mn and Si, the amount of oxygen in the weld metal is reduced, good toughness can be ensured. [0022] MgO在各种熔渣造渣剂这中是脱氧力最强的碱性熔渣造渣剂之一。 [0022] MgO is one of the strongest deoxidation agent in a variety of basic slag slag slag in which a flux. 在二氧化钛系FCW中,通过添加MgO作为熔渣造剂渣,能够大幅地降低焊接金属中的氧浓度,低温韧性大幅地改善。 In the titanium dioxide-based FCW by adding MgO as a slag agent residue made possible to significantly reduce the concentration of oxygen in the weld metal, significantly improve the low temperature toughness.

[0023] 另一方面,在二氧化钛系焊剂中的添加MgO,因为熔渣粘性及熔点降低,所以在全部焊接姿势、特别是向上立焊时的焊缝形状变凸等,成为使焊接作业性劣化的要因。 [0023] On the other hand, the titania-based flux was added MgO, because of the reduced viscosity and the melting point of the slag, it is all welded in position, especially when the weld shape become convex upward vertical position welding and the like, the welding workability becomes deteriorated the essential factor. 由于熔渣的粘性和熔点降低,熔化的熔渣难以凝固而容易流下来。 Due to reduced viscosity and melting point of the slag, it is difficult to solidify the molten slag flow down easily. 由此,抑制熔渣造成的熔融金属的垂落很困难,在大量添加MgO时会发生垂落,造成焊接困难。 Accordingly, to prevent the molten metal is drawn to slag caused difficulties occur when drawn large amount of MgO, resulting in difficult to weld.

[0024] 因此,经本发明者等的各种研究的结果发现,将Ti02量和MgO量的关系作为Mg0/Ti02比进行整理,在低温韧性改善方面有效,能够确保全部焊接姿势下的焊接作业性的最佳的平衡。 [0024] Thus, the result of various investigations of the present inventors found that the relationship between the amount of Ti02 and MgO amount as Mg0 / Ti02 ratio finishing effective in improvement of low-temperature toughness, the welding operation can be ensured under all welding posture optimal balance of. 这里,Mg0是Mg0的量和将金属Mg及Mg化合物的量换算成氧化物量的值的合计。 Here, the amount of Mg0 and the amount of the metal is Mg, and Mg compound oxide Mg0 converted into a value of the total amount. 金属Mg和Mg化合物与Mg0同样对焊接金属的脱氧效果强,在低温韧性改善方面有很大效果,但若大量添加则焊缝的形状不良,招致因垂落造成的无法焊接。 Mg compound with Mg metal and Mg0 same effect deoxidation of the weld metal is strong, has a great effect on improvement of low temperature toughness, but if the shape of the large amount of weld failure, leading to dripping caused by not welding. 为此,将此金属Mg及Mg化合物的量换算成氧化物量,作为Mg0量进行整理,能够明确给低温韧性及全部焊接姿势下的焊接作业性造成影响的因素。 For this reason, the amount of this metal compound, Mg and Mg in terms of oxide amount, the amount of a sort Mg0, can be clearly factors to cause the welding workability at all the welding posture and low temperature toughness.

[0025] 然而,仅仅使MgO/Ti(^比最佳化,对于评价全部焊接姿势下的焊接作业性尚不充分。向上立焊的焊缝形状与熔渣量大有关系,规定此溶渣量很重要。 [0025] However, just to make MgO / Ti (^ optimal ratio for the evaluation of the welding workability at all the welding posture is not sufficient. Vertical up welding seam shape relationship large slag, this slag predetermined the amount is very important.

[0026] 熔渣量过少时,因为不能在向上立焊中确保抑制焊接金属的熔渣的绝对量,所以会发生焊缝凸起或垂落。 [0026] excessively small amount of slag, the absolute amount of inhibition can not be ensured because the slag in the weld metal in the vertical upward welding, the weld projections or dripping can occur. 反之,熔渣量过多时,电弧也被埋在熔化的熔渣中,电弧稳定性劣 Conversely, too large amount of slag, arc is also buried in the molten slag, arc stability inferior

5化,确认到有飞溅发生量显著增加的倾向。 Of 5, tends to confirm the occurrence of a significant increase in the amount of spatter.

[0027] 由此,在确保MgO/Ti(^比(各化合物的质量比)的最佳平衡上,通过规定最佳熔渣量,能够确保全部焊接姿势下的良好的焊接作业性。除此以外,通过与上述的合金成分最佳化结合,能够兼顾低温韧性。 [0027] Accordingly, to ensure MgO / Ti (^ the ratio (mass ratio of each compound) optimal balance by a predetermined optimum amount of slag, it is possible to ensure good welding workability at all the welding posture. In addition outside, by optimizing the alloy composition described above in conjunction with, can achieve both low-temperature toughness.

[0028] 本发明基于以上结论,通过使焊丝中的合金成分的适当化及熔渣造渣剂的成分最佳化(MgO/Ti02比,熔渣量),来解决本发明的课题。 [0028] The present invention is based on the above conclusion, by suitably of slag and slag forming agents alloy component in the wire component Optimizer (MgO / Ti02 ratio, the amount of slag), the present invention is to solve the problem.

[0029] 接着,针对本发明的高张力钢用气体保护弧焊药芯焊丝,就其成分添加理由及其组成限定理由进行说明。 [0029] Next, shielded arc welding flux cored wire for high-tensile steel of the present invention is a gas, its components and of added reasons for limiting the composition will be explained. 还有,以下所示的成分,表示焊丝全部重量下的成分。 Also, the composition shown below, indicates the weight of all the components of the wire. 本发明的高张力钢用药芯焊丝由钢制外皮和填充焊剂构成,以下所示的成分,作为钢制外皮的组成成分及/或填充焊剂的含有成分被添加。 High-tensile steel according to the present invention is constituted by the steel sheath and the flux-cored wire filled with a flux component shown below, it is added as a component of the steel sheath and / or flux-containing filling ingredient. [0030] "C :0. 02〜0. 14质量%" [0030] "C:.. 0 02~0 14% by mass."

[0031] C是在焊接金属的强度确保中极其重要的成分。 [0031] C is an extremely important element to ensure the strength of the weld metal. 在本实施方式的高张力钢用气体保护弧焊药芯焊丝中,C含量低于O. 02质量X时,不能确保620MPa级以上的屈服点。 In the present embodiment, high tension steel used in gas shielded arc welding flux cored wire, C content is less than mass O. 02 X, does not ensure that more than 620MPa yield point level. 另外, 若C含量超O. 14%,则焊接金属的强度增加,低温裂纹敏感性显著提高。 Further, if the C content exceeds O. 14%, the strength of the weld metal increases, cold cracking susceptibility is remarkably improved. 因此,本实施方式的高张力钢用气体保护弧焊药芯焊丝的C含量为0. 02〜0. 14质量% ,更优选为0. 02〜 0. 08质量%。 Thus, the present embodiment is a high-tensile steel C content in gas shielded arc welding flux cored wire 0. 02~0. 14% by mass, more preferably 0.5% by mass 02~ 0.08.

[0032] "Si :0. 4〜1. 1质量%" [0032] "Si:.. 0 4~1 1% by mass."

[0033] Si是脱氧剂,是具有确保焊接金属的强度及降低氧量的效果的元素。 [0033] Si is a deoxidizing agent, is an element ensuring the strength of the weld metal and reducing the effects of oxygen. 在本实施方式的高张力钢用气体保护弧焊药芯焊丝中,Si含量低于0. 4质量%时,脱氧不充分,致使气孔发生及韧性不良。 In the present embodiment, high tension steel used in gas shielded arc welding flux cored wire, Si content is less than 0.4 mass%, deoxidation is insufficient, resulting in blowholes and poor toughness. 另一方面,若Si含量超过l. 1质量%,则焊接金属的粘性变高,与母材的融合变差等等焊接作业性劣化。 On the other hand, when the Si content exceeds l. 1% by mass, the viscosity of the weld metal is increased, poor integration of the base material is deteriorated and the like welding operation. 因此本实施方式的高张力钢用气体保护弧焊药芯焊丝的Si含量为0. 4〜1. 1质量%,更优选为0. 4〜0. 9质量%。 Thus a high-tensile steel according to the present embodiment is a gas shielded arc welding flux cored wire Si content is 0. 4~1. 1% by mass, more preferably 0.5 4~0. 9 mass%. [0034] "Mn :0. 8〜3. 0质量% " [0034] "Mn:.. 0 8~3 0 mass%."

[0035] Mn与Si同样作为脱氧剂使用,此外在提高焊接金属的韧性方向也有效。 [0035] Mn, like Si as a deoxidizer, in addition is also effective in the direction of improving the toughness of the weld metal. 在本实施方式的高张力钢用气体保护弧焊药芯焊丝中,当Mn含量低于0. 8质量%时,脱氧不足,致使气孔发生及韧性不良。 In the present embodiment, a high-tensile steel with a flux cored gas shielded arc welding, when the Mn content is less than 0.8 mass%, deoxidation is insufficient, resulting in blowholes and poor toughness. 另一方面,若Mn含量超过3. 0质量% ,则焊接金属的强度增加,低温裂纹敏感性显著变高。 On the other hand, when the Mn content is more than 3.0 mass%, the strength of the weld metal increases, cold cracking susceptibility becomes remarkably high. 因此,本实施方式的高张力钢用气体保护弧焊药芯焊丝的Mn含量为0. 8〜3. 0质量%,更优选为2. 1〜2. 9质量%。 Accordingly, the Mn content of steel with the gas shielded arc welding flux cored wire according to the present embodiment is a high tensile 8~3 0. 0% by mass, more preferably 2 ~ 2. 9 mass%. [0036] Ni :0. 2〜3. 1质量% [0036] Ni:.. 0 2~3 1 mass%

[0037] Ni是在确保焊接金属的强度和韧性上极其重要的成分。 [0037] Ni is extremely important in ensuring the strength and toughness of the weld metal component. 在本实施方式的高张力钢用气体保护弧焊药芯焊丝中,当Ni含量低于0. 2质量%时,得不到充分的韧性改善效果,若Ni超过l^,则高温裂纹的危险性高。 In the present embodiment dangerous high tension steel embodiment flux cored gas shielded arc welding, when the Ni content is less than 0.2 mass%, a sufficient toughness improving effect, than if the Ni l ^, high-temperature cracks high. 因此,本实施方式的高张力钢用气体保护弧焊药芯焊丝的Ni含量为0. 2〜3. 1质量% ,更优选为0. 8〜2. 7质量% 。 Thus, the Ni content steel gas shielded arc welding flux cored wire according to the present embodiment, high tensile strength is 2 ~ 0. 1% by mass, more preferably 0.5 8~2. 7 mass%. [0038] "Ti :0. 2质量%以下" [0038] "Ti: 0 2 mass% or less."

[0039] Ti的少量添加在使结晶粒微细化方面有效,但是Ti的添加超过0. 2质量%时,焊接金属中的固溶Ti增大,在重新加热部析出TiC,因此核生成能降低。 When the [0039] Ti is added in a small amount so that the effective grain refinement, but the addition of Ti more than 0.2 mass%, solid solution Ti in the weld metal increases, TiC precipitates in the reheating section, can be reduced so nucleation . 由此,粗大的板条状的贝氏体成为支配性的组织,韧性大大降低。 Thus, a coarse lath-like bainite becomes dominant tissue, toughness is greatly reduced. 因此,本实施方式的高张力钢用气体保护弧焊药芯焊丝的Ti含量控制在0. 2质量%以下。 Thus, a high-tensile steel according to the present embodiment is a gas shielded arc welding flux cored wire Ti content is controlled to 0.2 mass% or less. 但是,在本发明中即使不添加Ti,通过其他合金成分的适当化也能够确保良好的低温韧性。 However, in the present invention, even without adding Ti, by an appropriate component of the other alloy can be ensured good low-temperature toughness. 还有,Ti以金属Ti、Fe-Ti等的Ti合金形态 There, Ti metal Ti, Fe-Ti alloy such as Ti forms

6添加。 6 Add.

[0040] "N :0. 0150质量%以下" [0040] "N:. 0 0150% by mass or less"

[0041 ] 若N超过0. 0150质量% ,则焊接金属中的N量增加,气孔发生,此外成为韧性劣化的原因。 [0041] If N is more than 0.0150 mass%, the amount of N in the weld metal increases, blowholes, in addition causes deterioration of toughness. 因此N为0.0150质量X以下。 Thus the quality of X N is 0.0150 or less. 在本实施方式的高张力钢用气体保护弧焊药芯焊丝中,含有 In the present embodiment, a high-tensile steel with gas shielded arc welding flux cored wire, comprising

[0042] "Cr+Mo :0. 1〜4. 0质量% " [0042] "Cr + Mo:.. 0 1~4 0 mass%."

[0043] Cr能够稳定地确保强度,另外Mo也能够确保稳定的强度,另外通过其添加,能够实现结晶粒的微细化,是提高低温韧性的成分。 [0043] Cr is possible to stably secure strength, Mo additional stable strength can be ensured, through which the further addition, fine crystal grains can be achieved is to improve the low temperature toughness of the composition. 在本发明的高张力钢用气体保护弧焊药芯焊丝中,含有Cr及Mo的任意一方或双方,但Cr+Mo含量(如果Cr或Mo为单独添加则是单一含量,如果Cr或Mo是复合添加则是总量)低于O. 1质量%时,不能确保充分的强度。 In the present invention, a high-tensile steel used in gas shielded arc welding flux cored wire, comprising either one or both of Cr and Mo, the Cr + Mo content (Cr or Mo as if it is added separately, a single level, if a Cr or Mo the total amount of compound is added) below O. 1% by mass, sufficient strength can not be secured. 另一方面,若Cr+Mo含量超过4. 0质量% ,则不但焊接金属的强度增加,同时韧性劣化,另外还成为低温裂纹的原因。 On the other hand, when the Cr + Mo content is more than 4.0 mass%, not only the strength of the weld metal increases, while toughness is deteriorated, and also cause low-temperature cracking. 因此,本发明的高张力钢用气体保护弧焊药芯焊丝的Cr+Mo含量为0. 1〜4. 0质量%,更优选为0. 2〜1. 1质量%。 Accordingly, Cr is a high-tensile steel of the present invention is a gas shielded arc welding flux cored wire + Mo content of 0.5 ~ 4. 0% by mass, more preferably 2~1 0. 1% by mass. [0044] "Ti02+Mg0 :5. 0〜7. 2质量% " [0044] "Ti02 + Mg0:.. 5 0~7 2% by mass"

[0045] 在本发明的高张力钢用气体保护弧焊药芯焊丝中,当Ti02+Mg0含量(Ti02及Mg0 的合计含量)低于5. 0质量%时,由于熔渣量过少,从而在向上立焊中不能通过熔渣来抑制焊接金属,发生垂落。 [0045] In the present invention, a high-tensile steel with gas shielded arc welding flux cored wire, when Ti02 + Mg0 content (total content of Mg0 and Ti02) is less than 5.0 mass%, since the amount of slag is too small, so that can not stand up welding slag in the weld metal is suppressed, the occurrence of dripping. 另一方面,若Ti(^+Mg0含量超过7.2质量^,则由于熔渣量过多, 电弧也被埋在熔化的熔渣中,使电弧稳定性劣化,飞溅发生量增加。因此,Ti(^+Mg0含量为5. 0〜7. 2质量%。还有,这里MgO是MgO与金属Mg、Mg化合物的氧化物换算的合计。Ti02 是作为1102被添加的量。 On the other hand, if the Ti (^ + Mg0 content more than 7.2 mass ^, since the excessive amount of slag, arc is also buried in the molten slag, arc stability is deteriorated, the amount of occurrence of spatter increases. Thus, Ti ( ^ + Mg0 content of 5. 0 to 7. 2 mass%. also, where MgO is Mg metal and MgO, Mg compound oxide in terms of the total amount .Ti02 1102 as added.

[0046]"碱金属氟化物、碱金属氧化物、碱土类金属氟化物、碱土类金属氧化物、B、 Al及Mg:以总量计为2.0质量%以下" [0046] "alkali metal fluorides, alkali metal oxides, alkaline earth metal fluoride, alkaline earth metal oxide, B, Al and Mg: in a total amount of 2.0 mass% or less"

[0047] 碱金属氟化物、碱金属氧化物、碱土类金属氟化物、碱土类金属氧化物、B、Al及Mg 也可以被含有,不过也可以不被含有。 [0047] alkali metal fluoride, alkali metal oxides, alkaline earth metal fluoride, alkaline earth metal oxide, B, Al, and Mg may be contained, but may not be contained. 但是,含有这些元素或化合物时,以总量计要在2.0 质量%以下。 However, when containing these elements or compounds, to a total amount of 2.0 mass% or less. 碱金属氟化物、碱金属氧化物、碱土类金属氟化物、碱土类金属氧化物可使电弧稳定性提高,使飞溅减少。 Alkali metal fluorides, alkali metal oxides, alkaline earth metal fluoride, alkaline earth metal oxide can improve the arc stability, spatter reduction so. 另外,B使焊接金属的韧性提高。 Further, B increases the toughness of the weld metal. Al和Mg作为脱氧剂被添加。 Al and Mg is added as a deoxidizer. 这些物质以总量计若超过2. 0质量%,则会妨碍本发明的效果,因此这些物质的含量在2. 0 质量%以下。 These materials in total amount exceeds 2.0% by mass, the effect of the present invention will be hindered, and therefore the content of these substances in 2.0 mass% or less.

[0048] "Mg0/Ti02比x :0. 05〜0. 22" [0048] "Mg0 / Ti02 ratio x:.. 0 05~0 22"

[0049] 若Mg0的含量和Ti02的含量的比x( = Mg0/Ti02)超过0. 22,则在向上立焊中,作为容易使焊接金属垂落的成分的Mg0量与Ti02相比变得相对过大,因此在焊接中熔渣容易流下来,难以利用熔渣来抑制熔融金属的垂落。 [0049] If the content of Mg0 and Ti02 content ratio x (= Mg0 / Ti02) more than 0.22, then the upward vertical welding, weld metal as easily drawn to the component amount becomes relatively compared with Ti02 Mg0 is too large, the welding slag flow down easily, it is difficult to suppress the use of slag dripping of the molten metal. 因此,焊缝形状凸起或垂落。 Thus, the shape of the weld projections or curtaining. 如果x在0.22 以下,则在角焊中的角焊缝的脚长L和余高H的比(由后面的实施例说明)为10以上,能够得到良好的特性。 If x is 0.22 or less, the ratio of leg length of fillet weld fillet I L and high H (the embodiment described by the following Example) is 10 or more, good characteristics can be obtained. 此外,如果x在O. 10以下,则L/H为12以上,能够得到更优选的特性。 Further, if x is O. 10 or less, the L / H is 12 or more, more preferable characteristics can be obtained. 另一方面,因为后述的函数F(x)的上限值为15,所以必然地Mg0/Ti(^比x的下限值为0.05。 因此,Mg0/Ti02比x为0. 05〜0. 22。还有,这里Mg0是Mg0与金属Mg、Mg化合物的氧化物换算的合计。1102是作为1102被添加的量。 [0050] "F(x) :11〜15" On the other hand, since the upper limit of the function F (x) to be described later is 15, so inevitably Mg0 / Ti (^ than the lower limit value of 0.05 x Accordingly, Mg0 / Ti02 ratio x 0. 05~0 22. Further, where the metal Mg0 Mg0 is Mg, Mg compound oxide in terms of the total amount .1102 1102 is added as [0050] "F (x): 11~15".

[0051] F(x)由下述数式1赋予。 [0051] F (x) given by the following equation 1. 在此,x是前述的Mg0/Ti02比。 Here, x is the aforementioned Mg0 / Ti02 ratio. [0052] 【数式1】 [0052] [Equation 1]

[0053] F(x) = 37. 2Xxi0665-30 [0053] F (x) = 37. 2Xxi0665-30

[0054] F(x)表示实验求得的MgO/Ti02比x与低温韧性的关系。 [0054] F (x) shows a relationship between the experimentally obtained MgO / Ti02 ratio x and the low temperature toughness. 该关系式是在以下所示 This relationship is shown below

的各种合金及熔渣造渣剂的成分范围中,使用十数种的焊丝,通过统计处理计算出的该熔 The composition range of various alloys and slag in the slagging agent, a dozen kinds of wire, calculated by statistical processing of the fuse

敷金属在-e(TC的摆锤冲击试验结果和焊丝成分中的MgO/Ti02比x的关系。 Metallized impact MgO / Ti02 relationship between test results and the wire component ratio x in -e (TC pendulum.

[0055] C :0. 02〜0. 14质量% [0055] C:.. 0 02~0 14 mass%

[0056] Si :0. 4〜1. 1质量% [0056] Si:.. 0 4~1 1 mass%

[0057] Mn :0. 8〜3. 0质量% [0057] Mn:.. 0 8~3 0 mass%

[0058] Ni :0. 2〜3. 1质量% [0058] Ni:.. 0 2~3 1 mass%

[0059] Cr :0. 1〜4. 0质量% [0059] Cr:.. 0 1~4 0 mass%

[0060] Mo :0. 1〜4. 0质量% [0060] Mo:.. 0 1~4 0 mass%

[0061] Ti :0〜0. 2质量%以下 [0061] Ti:. 0~0 2 mass% or less

[0062] Fe :84. 1〜90. 1质量% [0062] Fe:.. 84 1~90 1% by mass

[0063] N :0. 0150质量%以下 [0063] N:. 0 0150% by mass

[0064] 其他的成分(B、Na、F、K、Li、Al、Ca、Mg、P、S) :0. 10〜3. 25质量% [0065] Ti02 :3. 5〜7. 8质量% [0066] MgO :0. 1〜5. 0质量% [0064] The other components (B, Na, F, K, Li, Al, Ca, Mg, P, S):.. 0 10~3 25 mass% [0065] Ti02:.. 3 5~7 8 mass % [0066] MgO:.. 0 1~5 0 mass%

[0067] 图l是表示通过本发明者的实验求得的F(x)与-6(TC的摆锤冲击值(以下称为vE-6(TC)的关系的曲线图。F(x)和vE-6(TC处于单递减的关系,当F(x)《15时, vE-6(TO 47J,可知具有优异的低温韧性。另外,因为MgO/Ti(^比x的上限值为0. 22,所以F(x)的下限值必然为ll。因此,根据此F(x),能够以高精度推定高张力钢用气体保护弧焊药芯焊丝的焊丝成分和焊接金属的低温韧性的关系。 [0067] Figure l is a diagram of the present inventors experimentally determined the F (x) -6 and Charpy impact value (TC (hereinafter referred graph showing the relationship vE-6 (TC) of .F (x) and vE-6 (TC in relation monotonously decreases when F (x) "15 when, vE-6 (tO 47J, found to have superior low temperature toughness. Further, since the MgO / Ti (^ than the upper limit value of x 0.22, the F (x) is necessarily lower limit ll. Thus, according to this F (x), it can be estimated with high accuracy with a high-tensile steel cryogenic gas shielded arc welding flux cored wire welding and metal components toughness relationship.

[0068] 若关于以上的x和F(x)进行归纳,若归纳本发明的范围,则为0.05《x《0.22即可。 [0068] If more than about x and F (x) to summarize, if the scope of the present invention are summarized, it was 0.05 "x" 0.22 to.

[0069] 另外,也如后面的实施例所示,即使不满足该x的范围,通过满足前述的其他条件,也能够得到焊接作业性和焊接金属的低温韧性两方面都良好的药芯焊丝。 [0069] Further, as also shown in the examples that follow, even if this does not satisfy the range of x by the other conditions are satisfied, the welding workability can be obtained and the low temperature toughness of the weld metal are both good flux-cored wire. 但是通过满足该x的范围,能够进一步使焊接金属的低温韧性提高。 However, by satisfying the range of x, it is possible further improve the low temperature toughness of the weld metal.

[0070] 本发明的药芯焊丝的余量的主要成分,是钢制外皮、填充焊剂中所含的各种Fe合金(Fe-Si、Fe-Mn、Fe-Cr、Fe-Mo、Fe-Ti等)及由铁粉而来的Fe。 [0070] The main component of the balance of the flux cored wire of the present invention, the sheath is made of steel, various Fe alloy (Fe-Si contained in the filler flux, Fe-Mn, Fe-Cr, Fe-Mo, Fe- Ti, etc.) and iron powder came Fe. 该Fe在焊丝全部重量中含有80质量%。 The Fe containing 80 mass% of the entire weight of the wire. 此外在本发明的药芯焊丝中,还含有碱金属氟化物、同氧化物、碱土类金属氟化物、同氧化物、B、Al、Mg等。 Further, in the flux cored wire of the present invention further contains an alkali metal fluoride, with oxides, alkaline earth metal fluorides, with the oxide, B, Al, Mg and the like. 本试验使用的药芯焊丝的N量在0.0150质量X以下。 N amount of flux cored wire used in this test X 0.0150 mass or less. 该N量越过0. 0150质量%时,焊接金属中的N量增加,气孔多发。 When the amount of N beyond 0.0150 mass%, N content of the weld metal increases, multiple pores. [0071]【实施例】 [0071] EXAMPLES

[0072] 以下,对于本发明的实施例的效果,与脱离本发明的范围的比较例相比较而进行说明。 [0072] Hereinafter, the effect of the embodiment of the present invention, as compared with Comparative Examples departing from the scope of the present invention will be described. 首先,作为本发明的实施例及比较例的焊丝,使用下述表3〜表5所示的焊丝成分(对于焊丝总质量的比例)及F(x)值的焊丝。 First, as a comparative example of the embodiment and the welding wire of the present invention, as shown below in Table 5 Table 3 ~ wire components (ratio to the total wire mass) and F (x) value of the welding wire. 这些供试焊丝的外箍(hoop)组成显示在下述表6中。 These test wire outer cuff (Hoop) composition shown in Table 6 below. 表7是表示在实施例及比较例的焊丝中使用的外箍种类的对照表。 Table 7 shows the outer ferrule type table used in the Examples and Comparative Examples wire in. 如该表7所示,表3及表4所示的各焊丝使用该表6所述的A或B的外箍。 As shown in Table 7, Table 3 and Table 4 using the respective wire shown in the table of the outer ferrule 6 A or B. 还有,在实施例及比较例的焊丝中,其他添加成分为P、S、Nb、V。 Further, in Examples and Comparative Examples wire, the other additive components as P, S, Nb, V.

8[0073](俯焊) 8 [0073] (a plan welding)

[0074] 表1显示了俯焊时的焊接条件。 [0074] Table 1 shows welding conditions when welding a plan. 以该表1所示的焊接条件焊接HT780钢,制作熔敷金属。 The welding conditions shown in Table 1 HT780 steel welding, making the deposited metal. 从该熔敷金属提取拉伸试验片(JIS Z3111 Al号)及摆锤冲击试验片(JIS Z3111 A4号),实施机械试验。 The extraction from a refractory metal cladding tensile test pieces (JIS No. Z3111 Al) and Charpy impact test piece (JIS Z 3111 No. A4), a mechanical test. 其结果是,得到的0. 2%屈服点及摆锤冲击值的测定值,和焊接作业性的评价结果显示在下述表8及表9中。 As a result, evaluation results of 0.2% yield point and the obtained measured value of the Charpy impact value, and the workability of the weld are indicated in Tables 8 and 9. 在表8及表9中,综合评价栏0为良好,X为不良。 In Table 8 and Table 9, column 0 is a good evaluation, X is bad.

[0075] 还有,如果熔敷金属的0. 2%屈服点为620MPa以上,_60°C的摆锤冲击值为27J以 [0075] Also, if the deposited metal 0.2% yield point of 620MPa or more, Charpy impact value of 27J _60 ° C to

上,则判断为机械的性质良好。 On, it is determined that the good mechanical properties. 此外,如果-60°C的摆锤冲击值为47J以上,则判断为具有优 Further, if the Charpy impact value of 47J -60 ° C or more, it is judged to have excellent

异的低温韧性。 Different low-temperature toughness.

[0076] 【表1】 [0076] [Table 1]

[0077] [0077]

<table>table see original document page 9</column></row> <table> <Table> table see original document page 9 </ column> </ row> <table>

[0078] 焊接条件如下。 [0078] The welding conditions were as follows.

[0079] 保护气体:80% Ar-20% C02, 25公升/分[0080] 焊丝直径:1.2mm [0081] 焊接姿势:俯焊 [0079] The shielding gas: 80% Ar-20% C02, 25 liters / min [0080] wire diameter: 1.2mm [0081] Welding position: welding a plan

[0082] 供试钢板:JIS G 3128 SHY685 (板厚:20mm) [0083] 坡口形状:45° V [0084] 坡口间隙:12mm [0085](角焊) [0082] The test steel: JIS G 3128 SHY685 (thickness: 20mm) [0083] groove shape: 45 ° V [0084] groove gap: 12mm [0085] (fillet weld)

[0086] 表l显示角焊的焊接条件。 [0086] Table l show welding conditions of fillet weld. 按表2所示的焊接条件,进行向上立角焊,评价向上立角焊的焊接作业性。 Welding conditions shown in Table 2, a vertical upward fillet welding, the welding operation evaluation vertical upward fillet welding. 图2是表示焊缝形状的评价方法的图。 FIG 2 is a diagram showing an evaluation method of the shape of the weld. 这时,为了根据角焊缝的脚长L和余高H来评价焊缝的垂下,使用L/H,如果该L/H的值为10以上则判断为良好。 In this case, in order to evaluate according to the leg length of fillet weld height H L and I hang down, using L / H, if the L / H is 10 or more is determined to be good. 还有, 焊缝的垂落、不可焊接时,L/H的值为0。 Also, drawn weld, welding is not available, L / H is zero. [0087] 【表2】 [0088] [0087] [Table 2] [0088]

<table>table see original document page 9</column></row> <table> <Table> table see original document page 9 </ column> </ row> <table>

[0089] 焊接条件如下。 [0089] The welding conditions were as follows.

[0090] 保护气体:80% Ar-20% C02, 25公升/分 [0090] The shielding gas: 80% Ar-20% C02, 25 liters / min

[0091] 焊丝直径:1.2mm [0091] The wire diameter: 1.2mm

[0092] 焊接姿势:向上立焊 [0092] Welding position: vertical up welding

[0093] 供试钢板:JIS G 3128 SHY685 (板厚:12mm) [0093] The test steel: JIS G 3128 SHY685 (thickness: 12mm)

[0094] 坡口间隙:0mm[0095] 另外,在此俯焊和角焊的焊接试验中,低温裂纹、高温裂纹的评价方法如下。 [0094] groove gap: 0mm [0095] Further, this welding tests overlooking welding and fillet weld, the low-temperature cracking, high-temperature cracking evaluation method is as follows. 即,低温裂纹是在焊接后放置96小时后,切削底层,通过超声波探伤试验(JIS Z 3060)、磁粉探伤试验(JIS G 0565)确认缺陷的有无。 That is, low temperature cracks after standing 96 hours after welding, cutting the bottom by ultrasonic flaw detection test (JIS Z 3060), magnetic particle testing (JIS G 0565) to confirm the presence or absence of defects. 此夕卜,用SEM(Scanning Electron Microscope)观察断面,确认裂纹的形态。 Bu this evening, the section was observed by SEM (Scanning Electron Microscope), the crack morphology confirmed.

[0096] 另外,拉伸试验及摆锤冲击试验依据JIS Z 3111熔敷金属的拉伸及冲击试验方法。 [0096] The tensile test and Charpy impact test and tensile deposited metal 3111 test according to JIS Z.

[0097] 【表3】 [0098] [0097] [Table 3] [0098]

<table>table see original document page 10</column></row> <table>[0101] 还有,在表3及表4中,其他栏中所述的数值的明细是碱金属氟化物、碱金属氧化物、碱土类金属氟化物、碱土类金属氧化物、B、Al及Mg和不可避免的杂质(P、S、V、Nb)的总量。 <Table> table see original document page 10 </ column> </ row> <table> [0101] Further, in Tables 3 and 4, the details of the other column values ​​are alkali metal fluorides, alkali ,, B the total alkaline earth metal oxide,, of Al and Mg and inevitable impurities (P, S, V, Nb) metal fluorides of alkaline earth metal oxide. 但是,不可避免的杂质的量整体为O. 1质量%,因此,例如表4的实施例17,其他为1.0 质量%,碱金属氟化物、碱金属氧化物、碱土类金属氟化物、碱土类金属氧化物、B、 Al及Mg 的总量为0. 9质量%,不可避免的杂质为0. 1质量%。 However, the amount of unavoidable impurities whole O. 1% by mass, and therefore, for example, Example 17 in Table 4, 1.0 mass% of other alkali metal fluoride, alkali metal oxides, alkaline earth metal fluoride, an alkaline earth a metal oxide, B, Al, and Mg is the total amount of 0.9 mass%, inevitable impurities is 0.1% by mass. 另外,实施例20不含碱金属氟化物、碱金属氧化物、碱土类金属氟化物、碱土类金属氧化物、B、 Al及Mg,其他的栏的数值为不可 Further, Example 20 alkali metal fluorides, alkali metal oxides, alkaline earth metal fluoride, alkaline earth metal oxide, B, Al and Mg, the value of the other column is not

避免的杂质的量。 The amount of impurities to avoid. [0102] 【表5】 [0102] [Table 5]

[0103] [0103]

<table>table see original document page 11</column></row> <table>[0104] 【表6】 [0105] <Table> table see original document page 11 </ column> </ row> <table> [0104] Table 6 [0105]

<table>table see original document page 11</column></row> <table>[0106] 【表7】 [0107] <Table> table see original document page 11 </ column> </ row> <table> [0106] Table 7 [0107]

<table>table see original document page 11</column></row> <table><table>table see original document page 12</column></row> <table>[0108] 【表8】 [0109] <Table> table see original document page 11 </ column> </ row> <table> <table> table see original document page 12 </ column> </ row> <table> [0108] Table 8 [0109]

<table>table see original document page 12</column></row> <table>[0112] 上述表8及表9显示这些试验结果。 <Table> table see original document page 12 </ column> </ row> <table> [0112] Table 8 and Table 9 shows the results of these tests. 实施例1〜5及实施例17〜21,0. 2%屈服点(PS)、 -e(TC的低温韧性.和包括焊缝形状的熔接作业性的全部都能够得到优异的特性。相对于此,比较例6〜16及比较例22〜30这些特性的某一种低, ~ 5 Example 17~21,0 and 2% proof stress (PS) Example embodiment, -e (TC low-temperature toughness and workability all fusion weld profile comprises both excellent characteristics can be obtained relative to here, a certain kind of these characteristics 22~30 6~16 and Comparative Example Comparative Example is low,

Claims (2)

  1. 一种气体保护弧焊药芯焊丝,其特征在于,由钢制外皮和填充焊剂构成,相对于焊丝总质量,含有:C:0.02~0.14质量%、Si:0.4~1.1质量%、Mn:0.8~3.0质量%、Ni:0.2~3.1质量%、Ti:0.2质量%以下、Cr及Mo:以总量计为0.1~4.0质量%,并含有TiO2及MgO以总量计为5.0~7.2质量%,还含有碱金属氟化物、碱金属氧化物、碱土类金属氟化物、碱土类金属氧化物、B、Al及Mg以总量计为2.0质量%以下,并且,将N限定在0.0150质量%以下,余量是不可避免的杂质和Fe。 A gas shielded arc welding flux cored wire, wherein the sheath is made from steel and flux filled with respect to the total mass of the wire, comprising: C: 0.02 ~ 0.14 mass%, Si: 0.4 ~ 1.1 mass%, Mn: 0.8 to 3.0 mass%, Ni: 0.2 ~ 3.1 mass%, Ti: 0.2 mass%, Cr and Mo: in a total amount of 0.1 to 4.0 mass%, and contains TiO2 and MgO in a total amount of 5.0 to 7.2 mass% further comprising an alkali metal fluoride, alkali metal oxides, alkaline earth metal fluoride, alkaline earth metal oxide, B, Al and Mg in total amount of 2.0 mass% or less, and N is limited to 0.0150% by mass or less , the balance being inevitable impurities and Fe.
  2. 2. 根据权利要求1所述的气体保护弧焊药芯焊丝,其特征在于,将MgO的含量和Ti02 的含量之比Mg0/Ti02定为x时,O. 05《x《0. 22。 The gas shielded arc welding flux cored wire as claimed in claim 1, wherein, when the content ratio of the Mg0 content of MgO and Ti02 / Ti02 as x, O. 05 "x" 0. 22.
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CN1709636A (en) 2005-07-18 2005-12-21 门树槐 Pipe die build-up welding cored wire
CN1739907A (en) 2005-09-15 2006-03-01 姜春 High hardness submerged arc welding wire

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NL1034459C2 (en) 2008-10-16
NL1034459A1 (en) 2008-04-08
KR100922095B1 (en) 2009-10-16
JP2008087043A (en) 2008-04-17
CN101157164A (en) 2008-04-09
NO20074783L (en) 2008-04-03
KR20080030936A (en) 2008-04-07
SE532239C2 (en) 2009-11-17
JP5005309B2 (en) 2012-08-22
SG141332A1 (en) 2008-04-28

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