JP2009039761A - Flux for submerged-arc welding for steel for low temperature use, and welding method thereof - Google Patents
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本発明は、低温液体用貯槽タンクの建造材料などに使用される５．５％Ｎｉ鋼や９％Ｎｉ鋼などの低温用鋼のサブマージアーク溶接用フラックスおよびその溶接方法に係わり、フラックス成分を適正化することで、従来の下向、水平すみ肉および横向姿勢溶接に加え、立向姿勢溶接が可能な低温用鋼のサブマージアーク溶接用フラックスおよびその溶接方法に関するものである。 The present invention relates to a flux for submerged arc welding of low-temperature steel such as 5.5% Ni steel and 9% Ni steel used as a construction material for a cryogenic liquid storage tank, and its welding method. The present invention relates to a flux for submerged arc welding of low temperature steel capable of vertical position welding in addition to conventional downward, horizontal fillet, and horizontal position welding, and its welding method.
サブマージアーク溶接方法は、高能率で高品位な溶接継手が得られることから、低温用鋼の溶接に多く使用されている。溶接姿勢は、下向や水平すみ肉などの従来使用されている姿勢の他、横向姿勢溶接が可能なフラックスが開発され、低温液体用貯槽タンクの建造などに適用されている。 The submerged arc welding method is often used for welding low-temperature steel because a high-efficiency and high-quality welded joint can be obtained. As for the welding posture, in addition to the conventionally used postures such as downward and horizontal fillets, a flux capable of transverse posture welding has been developed and applied to construction of storage tanks for cryogenic liquids.
５．５％Ｎｉ鋼や９％Ｎｉ鋼などの低温用鋼の溶接部は、熱処理を行わず溶接のままで低温靱性が要求されることから、母材よりもＮｉ含有量の多い溶接用ワイヤが適用されている。現場施工では、下向姿勢や水平すみ肉溶接にはサブマージアーク溶接方法、立向姿勢溶接には、被覆アーク溶接やＴＩＧ溶接方法が適用されている。更に最近では、高能率で溶接作業性に優れるガスシールドアーク溶接用フラックス入りワイヤの開発が進められているものの、耐割れ性が不十分であり、突合せ継手の溶接には、被覆アーク溶接方法が主流となっている。しかし被覆アーク溶接方法は、溶接能率が低く、現場施工の工期短縮の課題となっていた。そこで高能率で、溶接金属の耐割れ性に優れる立向上進溶接も可能なサブマージアーク溶接材料およびその溶接方法が要求されていた。 Because welding parts of low-temperature steel such as 5.5% Ni steel and 9% Ni steel do not undergo heat treatment and require low-temperature toughness, welding wires with a higher Ni content than the base metal Has been applied. In the field construction, the submerged arc welding method is applied to the downward posture and horizontal fillet welding, and the covering arc welding method and the TIG welding method are applied to the vertical posture welding. In recent years, the development of flux-cored wire for gas shielded arc welding, which is highly efficient and excellent in welding workability, has been progressed, but its crack resistance is insufficient. It has become mainstream. However, the coated arc welding method has a low welding efficiency, and has been a problem of shortening the construction period of on-site construction. Therefore, there has been a demand for a submerged arc welding material and a welding method thereof that are highly efficient and capable of advancing welding with excellent weld metal crack resistance.
従来、低温用鋼のサブマージアーク溶接材料およびその溶接方法は、例えば、特許文献１に、フラックス成分を適正化することで、水平すみ肉および横向姿勢溶接の溶接作業性に優れる９％Ｎｉ鋼のサブマージアーク溶接用フラックスが提案されている。しかし、特許文献１に記載の技術で立向姿勢溶接を行うとビード形状が凸状になりやすく、最終層の溶接ビードをグラインダなどで平滑にする必要があるなどの課題があり、立向姿勢溶接には適用が困難であった。 Conventionally, a submerged arc welding material for low temperature steel and a welding method thereof are disclosed in, for example, Patent Document 1 by using a 9% Ni steel excellent in welding workability in horizontal fillet and lateral posture welding by optimizing a flux component. Submerged arc welding fluxes have been proposed. However, when the vertical position welding is performed by the technique described in Patent Document 1, the bead shape tends to be convex, and there is a problem that the weld bead of the final layer needs to be smoothed by a grinder or the like. It was difficult to apply to welding.
また、特許文献２には、ワイヤおよびフラックス成分を適正化することで、耐割れ性およびビード外観の優れた溶接部が得られる低温用鋼のサブマージアーク溶接法が提案されている。しかし、特許文献２に記載の技術においても立向姿勢溶接を行うとビード形状が凸状になりやすい課題があり、立向姿勢溶接には適用が困難であった。 Further, Patent Document 2 proposes a submerged arc welding method for low-temperature steel in which a welded portion having excellent crack resistance and bead appearance can be obtained by optimizing the wire and flux components. However, even in the technique described in Patent Document 2, there is a problem that the bead shape tends to be convex when the vertical position welding is performed, and it is difficult to apply the vertical position welding.
本発明は、低温液体用貯槽タンクの建造材料等に使用される５．５％Ｎｉ鋼や９％Ｎｉ鋼などの溶接において、従来の下向、水平すみ肉および横向姿勢溶接に加え、立向姿勢溶接が可能な低温用鋼のサブマージアーク溶接用フラックスおよびその溶接方法を提供することを目的とする。 In the welding of 5.5% Ni steel, 9% Ni steel, etc. used for building materials for cryogenic liquid storage tanks, etc., in addition to the conventional downward, horizontal fillet and lateral posture welding, the present invention An object of the present invention is to provide a flux for submerged arc welding of low temperature steel capable of posture welding and a welding method thereof.
本発明者らは、前記課題を解決するためにサブマージアーク溶接用フラックスのスラグ生成剤および合金剤成分について種々検討を行った。その結果、ＣａＦ２を低減し、Ａｌ２Ｏ３を積極的に添加することで、従来の下向、水平すみ肉および横向姿勢溶接に加え、立向姿勢溶接が可能になることを見出した。しかし、Ａｌ２Ｏ３の過剰な添加は、スラグ巻込みを生じやすく、また溶接金属中に介在物が発生しやすいことが分かった。
そこで更に検討を加えた結果、Ｎａ２Ｏを適量添加することによってアークの安定性が向上し、スラグ巻込みを防止できると共に、溶接金属中の介在物をスラグへの放出を促すことが明らかとなった。
In order to solve the above-mentioned problems, the present inventors have conducted various studies on the slag generating agent and the alloying agent component of the flux for submerged arc welding. As a result, it has been found that by reducing CaF 2 and positively adding Al 2 O 3 , vertical position welding becomes possible in addition to conventional downward, horizontal fillet and horizontal position welding. However, it has been found that excessive addition of Al 2 O 3 tends to cause slag entrainment and to easily generate inclusions in the weld metal.
As a result of further studies, it is clear that adding an appropriate amount of Na 2 O improves the stability of the arc, prevents slag entrainment, and promotes the release of inclusions in the weld metal into the slag. became.
本発明は以上の知見によりなされたもので、その要旨とするところは、低温用鋼の溶接に用いるサブマージアーク溶接用フラックスにおいて、フラックス全質量に対する質量％で、
Ａｌ２Ｏ３：３１〜６０％、
ＣａＦ２：１０〜４０％、
ＳｉＯ２：１〜１０％、
Ｎａ２Ｏ：０．１〜５％、
金属Ａｌ：０．１〜５％を含有し、
その他はＣａＣＯ３、ＣａＯ、ＭｇＯ、金属Ｍｎおよび不可避不純物であることを特徴とする低温用鋼のサブマージアーク溶接用フラックス。
また、Ｎｉを６０質量％以上含むワイヤと前記フラックスを組合せて溶接することを特徴とする低温用鋼のサブマージアーク溶接方法にある。
The present invention has been made based on the above knowledge, and the gist of the present invention is, in the flux for submerged arc welding used for welding low temperature steel, in mass% with respect to the total mass of the flux,
Al 2 O 3: 31~60%,
CaF 2: 10~40%,
SiO 2: 1~10%,
Na 2 O: 0.1 to 5%,
Metal Al: contains 0.1 to 5%,
Others are CaCO 3 , CaO, MgO, metal Mn, and inevitable impurities, and a flux for submerged arc welding of low-temperature steel.
Further, the present invention is a submerged arc welding method for low temperature steel, characterized by welding by combining a wire containing 60 mass% or more of Ni and the flux.
本発明の低温用鋼のサブマージアーク溶接用フラックスおよびその溶接方法によれば、従来の下向、水平すみ肉および横向姿勢溶接に加え、立向姿勢溶接においてもアークが安定でスラグ剥離性およびビード形状が良好で溶接欠陥が生じないなど、高能率で高品位な溶接継手性能を得ることができる。 According to the flux for submerged arc welding of low temperature steel and the welding method of the present invention, the arc is stable and slag peelability and bead can be used in vertical position welding in addition to the conventional downward, horizontal fillet and horizontal position welding. High-efficiency and high-quality welded joint performance such as good shape and no weld defects can be obtained.
以下本発明を詳細に説明する。
本発明は、低温用鋼の溶接に用いるサブマージアーク溶接用フラックスおよび組合せるワイヤの各成分組成それぞれの共存による単独および相乗効果によりなし得たものであるが、以下にそれぞれの各成分組成の添加理由および限定理由を述べる。
The present invention will be described in detail below.
The present invention can be achieved by independent and synergistic effects due to the coexistence of each component composition of the submerged arc welding flux and the wire to be combined used for welding low temperature steel. Give reasons and reasons for limitation.
Ａｌ２Ｏ３：３１〜６０％、
Ａｌ２Ｏ３は、溶接スラグの融点を高め、ビード形状を平滑にする目的で添加する。３１質量％（以下、％という。）未満ではその効果が十分に得られず、特に立向姿勢溶接においてビード形状が凸状となる。一方、６０％を超えて添加すると、スラグの剥離性が悪くなる。従って、Ａｌ２Ｏ３は３１〜６０％とする。また効果が得られる、より好ましい範囲は３５〜５５％である。
Al 2 O 3: 31~60%,
Al 2 O 3 is added for the purpose of increasing the melting point of the weld slag and smoothing the bead shape. If the amount is less than 31% by mass (hereinafter referred to as “%”), the effect cannot be obtained sufficiently, and the bead shape becomes convex particularly in the vertical posture welding. On the other hand, if it is added in excess of 60%, the slag removability deteriorates. Accordingly, Al 2 O 3 is set to 31 to 60%. Moreover, the more preferable range from which an effect is acquired is 35 to 55%.
ＣａＦ２：１０〜４０％、
ＣａＦ２は、アークの安定性を向上させる目的で添加する。１０％未満では、その効果が十分に得られず、短絡が生じやすくアーク状態が不安定となる。一方、４０％を超えて添加すると、特に立向姿勢溶接においてアーク長の変動が生じやすく、アーク状態が不安定となる。従って、ＣａＦ２は１０〜４０％とする。また効果が得られる、より好ましい範囲は１５〜３５％である。
CaF 2: 10~40%,
CaF 2 is added for the purpose of improving the stability of the arc. If it is less than 10%, the effect cannot be obtained sufficiently, and a short circuit is likely to occur, and the arc state becomes unstable. On the other hand, if added over 40%, the arc length is likely to fluctuate particularly in the vertical position welding, and the arc state becomes unstable. Therefore, CaF 2 is 10 to 40%. Moreover, the more preferable range from which an effect is acquired is 15 to 35%.
ＳｉＯ２：１〜１０％、
ＳｉＯ２は、耐割れ性確保の観点から、極力添加しないことが好ましい。しかし、フラックスの造粒に必要な固着剤の主成分であることから、少なくとも１％は含有される。一方、１０％を超えて添加すると、低融点介在物を生成し、高温割れが発生しやすくなる。従って、ＳｉＯ２は１〜１０％とする。また効果が得られる、より好ましい範囲は１〜６％である。
SiO 2: 1~10%,
From the viewpoint of ensuring crack resistance, SiO 2 is preferably not added as much as possible. However, since it is a main component of the fixing agent necessary for the granulation of the flux, at least 1% is contained. On the other hand, if it exceeds 10%, low melting point inclusions are generated and high temperature cracking is likely to occur. Thus, SiO 2 is 1 to 10%. Moreover, the more preferable range from which an effect is acquired is 1 to 6%.
Ｎａ２Ｏ：０．１〜５％、
Ｎａ２Ｏは、アーク安定性を良好とすると共に、アークの集中性を高め、溶接金属中のスラグ巻込みおよびＡｌ２Ｏ３などの介在物をスラグへの放出を促し、耐欠陥性を高める目的で添加する。０．１％未満では、特に立向姿勢溶接においてその効果が十分に得られない。一方、５％を超えて添加すると、スラグの剥離性が悪くなる。従って、Ｎａ２Ｏは０．１〜５％とする。また効果が得られる、より好ましい範囲は１〜４％である。
Na 2 O: 0.1 to 5%,
Na 2 O improves arc stability, enhances the concentration of the arc, promotes slag entrainment in the weld metal and releases inclusions such as Al 2 O 3 into the slag, and improves defect resistance. Add for purpose. If it is less than 0.1%, the effect cannot be obtained sufficiently particularly in vertical posture welding. On the other hand, if it is added in excess of 5%, the slag removability deteriorates. Thus, Na 2 O is 0.1 to 5%. Moreover, the more preferable range from which an effect is acquired is 1-4%.
金属Ａｌ：０．１〜５％、
金属Ａｌは、ブローホールを低減する目的で添加する。０．１％未満では、その効果が十分に得られず、ブローホールが発生する。５％を超えて添加すると、スラグの剥離性が悪くなる。従って、金属Ａｌは０．１〜５％とする。金属Ａｌ源として、Ｆｅ−Ａｌ、Ａｌ、Ａｌ−Ｍｇなどが使用できる。また効果が得られる、より好ましい範囲は１〜３％である。
Metal Al: 0.1 to 5%,
Metal Al is added for the purpose of reducing blowholes. If it is less than 0.1%, the effect cannot be sufficiently obtained, and blow holes are generated. If it exceeds 5%, the slag peelability will deteriorate. Therefore, metal Al is made 0.1 to 5%. As the metal Al source, Fe—Al, Al, Al—Mg, or the like can be used. Moreover, the more preferable range from which an effect is acquired is 1-3%.
本発明の低温用鋼のサブマージアーク溶接用フラックスは、前記成分の他、スラグ生成剤や合金剤として、ＭｇＯ：１〜２０％、ＣａＣＯ３：１〜１８％、ＣａＯ：１〜２０％、金属Ｍｎ：０．１〜５％程度を含有することができる。 The flux for submerged arc welding of the low-temperature steel of the present invention includes MgO: 1 to 20%, CaCO 3 : 1 to 18%, CaO: 1 to 20%, metal as a slag generator and an alloying agent in addition to the above components. Mn: About 0.1 to 5% can be contained.
ＭｇＯは、スラグの融点を高くし、ビード形状を整える目的で添加できる。１％以上で効果が生じるが、添加量が過多で２０％を超えると、スラグインクルージョンを生じやすくなる。このためＭｇＯ：１〜２０％とすることが好ましい。 MgO can be added for the purpose of increasing the melting point of the slag and adjusting the bead shape. The effect is produced at 1% or more, but when the amount added is excessive and exceeds 20%, slag inclusion tends to occur. For this reason, it is preferable to set it as MgO: 1 to 20%.
ＣａＣＯ３は、溶接中にＣＯ２ガスを発生させ、溶接金属をシールドし、ＮやＯ量低い溶接金属を得る目的で添加できる。１％以上で効果が生じるが、添加量が過多で１８％を超えると、アーク状態が不安定となる。このためＣａＣＯ３：１〜１８％とすることが好ましい。 CaCO 3 can be added for the purpose of generating CO 2 gas during welding, shielding the weld metal, and obtaining a weld metal having a low N or O content. The effect is produced at 1% or more, but if the addition amount is excessive and exceeds 18%, the arc state becomes unstable. Therefore CaCO 3: It is preferable to 1-18%.
ＣａＯは、スラグの流動性を良好とし、融合不良やスラグインクルージョンを防止する目的で添加できる。１％以上で効果が生じるが、添加量が過多で２０％を超えると、ビード形状が凸状になりやすい。このためＣａＯ：１〜２０％とすることが好ましい。 CaO can be added for the purpose of improving fluidity of slag and preventing poor fusion and slag inclusion. The effect is produced at 1% or more, but if the addition amount is excessive and exceeds 20%, the bead shape tends to be convex. For this reason, it is preferable to set it as CaO: 1 to 20%.
金属Ｍｎは、溶接金属中の不純物であるＳと反応し、溶接金属のＭｎＳ介在物としてＳを固定させ、耐高温割れ性を向上させる目的で添加できる。０．１％以上で効果が生じるが、添加量が過多で１０％を超えると、スラグの剥離性を劣化させる。このため金属Ｍｎ：０．１〜５％とすることが好ましい。 Metal Mn can be added for the purpose of reacting with S which is an impurity in the weld metal, fixing S as MnS inclusions in the weld metal, and improving hot cracking resistance. The effect is produced at 0.1% or more, but if the amount added exceeds 10%, the slag peelability is deteriorated. For this reason, it is preferable to set it as metal Mn: 0.1-5%.
その他、溶接作業性調整のためＴｉＯ２、ＺｒＯ２、ＦｅＯ、Ｆｅ２Ｏ３、Ｋ２Ｏなどを、合金剤としてＮｉ、Ｍｏ、Ｗなどを適宜添加でき、これらの合計は１〜１０％程度含有することができる。 In addition, TiO 2 , ZrO 2 , FeO, Fe 2 O 3 , K 2 O and the like can be appropriately added as an alloying agent for adjusting welding workability, and the total of these is about 1 to 10%. Can be contained.
その他不可避不純物としては、フラックス原材料の不純物であるＣ、Ｐ、Ｓ、Ｆｅおよび水分などがある。 Other inevitable impurities include C, P, S, Fe, and moisture, which are impurities of the flux raw material.
以上、本発明の低温用鋼のサブマージアーク溶接用フラックス構成要件の限定理由を述べたが、フラックスの製造方法について更に言及すると、粉末原材料を、配合、撹拌した後、固着剤（珪酸ソーダおよび／または珪酸カリの水溶液）を添加し、その後流動乾燥、焼成を行い、ボンド状フラックスにする。 As mentioned above, although the reason for limitation of the flux constituent requirements for submerged arc welding of the low-temperature steel of the present invention has been described, when further referring to the method for producing the flux, the powder raw material is blended and stirred, and then the fixing agent (sodium silicate and / or Or an aqueous solution of potassium silicate), followed by fluid drying and firing to obtain a bond-like flux.
溶接作業性の向上を目的として、事前に溶解、粉砕したメルトフラックスを原材料として用いることもできる。 For the purpose of improving welding workability, a melt flux previously melted and pulverized can be used as a raw material.
前記フラックスと組合せるワイヤは、Ｎｉを６０％以上含有するインコネル系、ハステロイ系合金ワイヤとし、低温液体用貯槽タンクの品質要求に合わせて、適宜選択できる。ワイヤのＮｉが６０％未満であると、低温液体用貯槽タンクの品質要求を満足できない。したがって、Ｎｉを６０質量％以上含むワイヤと限定した。 The wire combined with the flux is an Inconel or Hastelloy alloy wire containing 60% or more of Ni, and can be appropriately selected according to the quality requirements of the cryogenic liquid storage tank. If the Ni of the wire is less than 60%, the quality requirement of the cryogenic liquid storage tank cannot be satisfied. Therefore, it was limited to a wire containing 60 mass% or more of Ni.
以下、実施例により本発明の効果をさらに詳細に説明する。 Hereinafter, the effect of the present invention will be described in more detail with reference to examples.
表１に試作フラックスを示す。組合せワイヤは、表２に示す組成のＮｉを６０質量％以上含有するワイヤとした。ワイヤ径は下向および横向姿勢溶接は２．４ｍｍ、立向姿勢溶接は１．２ｍｍとした。 Table 1 shows the prototype flux. The combination wire was a wire containing 60% by mass or more of Ni having the composition shown in Table 2. The wire diameter was 2.4 mm for downward and lateral position welding, and 1.2 mm for vertical position welding.
溶接は、９％Ｎｉ低温用鋼の板厚１６ｍｍを用い、ＪＩＳ Ｚ ３３３３の溶接継手の曲げ試験片採取用溶接試験体に準拠し、下向および横向姿勢溶接を行った。立向姿勢溶接については、下向姿勢溶接と同様の開先形状とした。溶接作業性は、アークの安定性、スラグの剥離性およびビード形状の評価を行った。スラグ巻込み、介在物の有無、ブローホールおよび割れの発生の有無については、溶接作業性評価に用いた溶接試験体の放射線透過試験を行い、ＪＩＳ Ｚ ３１０６による疵の像の分類に従い、第１種１類を良好とした。 Welding was performed by using a 9% Ni low-temperature steel plate thickness of 16 mm in accordance with JIS Z 3333 welded specimens for collecting bent specimens of welded joints, and performing downward and lateral posture welding. For the vertical position welding, the groove shape was the same as the downward position welding. Welding workability was evaluated for arc stability, slag peelability and bead shape. Regarding slag entrainment, presence of inclusions, occurrence of blowholes and cracks, a radiation transmission test was conducted on the weld specimen used for the evaluation of welding workability, and according to the classification of wrinkles according to JIS Z 3106, the first Species 1 was considered good.
溶接条件は、電極の極性をＤＣ（＋）とし、下向および横向姿勢溶接の場合、溶接電流：３００〜４００Ａ、立向姿勢溶接の場合、溶接電流：１５０〜２３０Ａとした。それらの結果を表１に纏めて示す。 The welding conditions were such that the polarity of the electrode was DC (+), the welding current was 300 to 400 A in the case of downward and lateral orientation welding, and the welding current was 150 to 230 A in the vertical orientation welding. The results are summarized in Table 1.
表１中フラックスＮｏ．１〜５が本発明例、フラックスＮｏ．６〜１０は比較例である。本発明であるフラックスＮｏ．１〜５は、Ａｌ２Ｏ３、ＣａＦ２、ＳｉＯ２、Ｎａ２Ｏおよび金属Ａｌの含有量が適正であるので、アークが安定し、スラグ剥離性およびビード形状が良好で、放射線透過試験結果も良好であり、極めて満足な結果であった。 In Table 1, Flux No. 1-5 are examples of the present invention, flux No. 6 to 10 are comparative examples. Flux No. which is the present invention. Nos. 1 to 5 have appropriate contents of Al 2 O 3 , CaF 2 , SiO 2 , Na 2 O and metal Al, so that the arc is stable, the slag peelability and the bead shape are good, and the radiation transmission test results The results were also very satisfactory.
比較例中フラックスＮｏ．６は、Ａｌ２Ｏ３が低いので、特に立向姿勢溶接においてビード形状が凸状であった。また、ＣａＦ２が高いので、特に立向姿勢溶接においてアーク状態が不安定であった。 In the comparative example, flux No. No. 6 was low in Al 2 O 3 , so that the bead shape was convex especially in the vertical position welding. Further, since CaF 2 is high, the arc state was unstable, particularly in vertical position welding.
フラックスＮｏ．７は、Ａｌ２Ｏ３が高いので、スラグの剥離性が悪かった。また、ＣａＦ２が低いので、アーク状態が不安定であった。 Flux No. No. 7 had high Al 2 O 3 , so the slag peelability was poor. In addition, since the CaF 2 is low, the arc state was unstable.
フラックスＮｏ．８は、ＳｉＯ２が高いので、割れが発生した。また金属Ａｌが低いので、ブローホールが発生して放射線透過試験結果が不良であった。 Flux No. In No. 8, since SiO 2 was high, cracks occurred. Moreover, since metal Al was low, a blowhole was generated and the radiation transmission test result was poor.
フラックスＮｏ．９は、Ｎａ２Ｏが高いので、スラグ剥離性が悪かった。 Flux No. 9, since the Na 2 O is high, the slag removability is poor.
フラックスＮｏ．１０は、Ｎａ２Ｏが低いので、立向姿勢溶接においてスラグ巻込みが発生し、介在物に起因する点状の疵が発生して放射線透過試験結果が不良であった。また金属Ａｌが高いのでスラグの剥離性も悪かった。 Flux No. In No. 10, since Na 2 O was low, slag entrainment occurred in vertical position welding, and dot-like wrinkles due to inclusions occurred, resulting in poor radiation transmission test results. Moreover, since metal Al was high, the slag peelability was also poor.
Claims (2)
Ａｌ２Ｏ３：３１〜６０％、
ＣａＦ２：１０〜４０％、
ＳｉＯ２：１〜１０％、
Ｎａ２Ｏ：０．１〜５％、
金属Ａｌ：０．１〜５％を含有し、その他はＣａＣＯ３、ＣａＯ、ＭｇＯ、金属Ｍｎおよび不可避不純物であることを特徴とする低温用鋼のサブマージアーク溶接用フラックス。 In the flux for submerged arc welding used for welding low temperature steel, in mass% with respect to the total mass of the flux,
Al 2 O 3: 31~60%,
CaF 2: 10~40%,
SiO 2: 1~10%,
Na 2 O: 0.1 to 5%,
A flux for submerged arc welding of low-temperature steel, characterized by containing metal Al: 0.1 to 5%, and the others being CaCO 3 , CaO, MgO, metal Mn and inevitable impurities.
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| CN101966630A (en) * | 2009-07-27 | 2011-02-09 | 株式会社神户制钢所 | Material and method for submerged arc welding of 9% Ni steel |
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