JP5065733B2 - Flux-cored wire for welding stainless steel and method for producing the same - Google Patents
Flux-cored wire for welding stainless steel and method for producing the same Download PDFInfo
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本発明は、ステンレス鋼溶接用フラックス入りワイヤに係わり、溶接した際に生成するスラグ中の水に可溶性の６価Ｃｒ（以下、溶出Ｃｒという。）量の低減を図ったステンレス鋼溶接用フラックス入りワイヤおよびその製造方法に関するものである。 The present invention relates to a flux-cored wire for welding stainless steel, and is a flux-cored wire for stainless steel welding that reduces the amount of hexavalent Cr soluble in water in the slag produced during welding (hereinafter referred to as eluted Cr). The present invention relates to a wire and a manufacturing method thereof.
フラックス入りワイヤは、高能率で良好な溶接作業性が得られることから、被覆アーク溶接棒の需要から置換が進み、特にステンレス鋼の溶接の場合、最も使用量が多い溶接材料である。また、生成するスラグ量が被覆アーク溶接やサブマージアーク溶接に比べ大幅に少ないことから、産業廃棄物として処理されるスラグの低減につながり、造船、建築、車両、容器など多くの分野で使用されている。 Since the flux-cored wire is highly efficient and provides good welding workability, the replacement of the flux-cored wire has been progressed due to the demand for the coated arc welding rod, and is the welding material that is used most frequently in the case of stainless steel welding. In addition, the amount of slag produced is significantly less than that of clad arc welding and submerged arc welding, leading to reduction of slag that is treated as industrial waste, and is used in many fields such as shipbuilding, construction, vehicles, and containers. Yes.
しかし、溶接スラグ生成量が少ないながらもそのスラグには、有害とされる溶出Ｃｒが含有されている。産業廃棄物規制の一例として、東京都特別管理産業廃棄物の鉱さいでは、令第２条の４第５号ホにより、溶出Ｃｒ量は１．５ｍｇ／リットル以下とされており、溶出Ｃｒを非常に低い量に抑える必要がある。 However, although the amount of weld slag produced is small, the slag contains dissolved Cr that is considered harmful. As an example of industrial waste regulations, in the specially controlled industrial waste mine in Tokyo, the amount of Cr eluted is set to 1.5 mg / liter or less according to Article 2-4 No. 5 of the Ordinance. Must be kept low.
この課題を解決する技術として例えば、Ｓｉ、Ｔｉ、Ｚｒ、Ｃｒ、ＮａおよびＫ量を適正化することで、溶接スラグの溶出Ｃｒ量を低減できるステンレス鋼溶接用フラックス入りワイヤが提案（例えば、特許文献１参照）されている。しかし、前記技術に記載の溶接スラグの溶出Ｃｒ量では環境問題に厳しい規制のかけられた産業廃棄物として適合できない場合があった。 As a technique for solving this problem, for example, a flux-cored wire for welding stainless steel that can reduce the amount of Cr eluted from welding slag by optimizing the amount of Si, Ti, Zr, Cr, Na and K is proposed (for example, patent Reference 1). However, the amount of Cr eluted from the welding slag described in the above technology may not be suitable as industrial waste that is subject to strict regulations on environmental issues.
本発明は、ステンレス鋼溶接用フラックス入りワイヤを用いて溶接した場合に、生成する溶接スラグの溶出Ｃｒ量の低減を図ったステンレス鋼溶接用フラックス入りワイヤおよびその製造方法を提供することを目的とする。 It is an object of the present invention to provide a stainless steel welding flux cored wire and a method of manufacturing the same, in which the amount of Cr eluted from the weld slag produced when welding is performed using a stainless steel welding flux cored wire. To do.
本発明者らは、前記課題を解決するためにオーステナイト系ステンレス鋼外皮に充填するフラックスの金属およびスラグ剤成分について種々検討を行った。その結果、溶接スラグの溶出Ｃｒ量を低減するためには、充填するフラックスに金属弗化物を添加することが有効であることが判明した。金属弗化物中のＦは、Ｃｒと反応して毒性のない３価Ｃｒの安定化を行い、溶接スラグの溶出Ｃｒ量を低減する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 metal and slag agent components of the flux filled in the austenitic stainless steel skin. As a result, it has been found that it is effective to add metal fluoride to the flux to be filled in order to reduce the amount of Cr eluted from the weld slag. It has become clear that F in metal fluoride reacts with Cr to stabilize non-toxic trivalent Cr and reduces the amount of Cr eluted from the weld slag.
一方、Ｆの多量添加は、溶接時にヒュームの発生量を多くするという課題が生じたので、更なる検討を加えた。その結果、Ｃｒの無害化を促進するＦに対し、一定量のＮａ化合物およびＫ化合物を添加することによって少量のＦ量で溶出Ｃｒ量の低減が可能になることを見出した。 On the other hand, the addition of a large amount of F causes a problem of increasing the amount of fumes generated during welding, and thus further studies have been made. As a result, it was found that the amount of Cr eluted can be reduced with a small amount of F by adding a certain amount of Na compound and K compound to F which promotes the detoxification of Cr.
前記の知見によって、ステンレス鋼溶接用フラックス入りワイヤのＣｒ量に対し、Ｆを適量含有させることで溶接スラグの溶出Ｃｒを低減でき、さらにＮａ化合物およびＫ化合物からＮａおよびＫを添加することで、少量のＦ添加で溶接スラグの溶出Ｃｒ量を大幅に低減できることが明らかとなった。更にＡｌは、溶接時に酸化されてＡｌ２Ｏ３としてスラグになるが生成したスラグの中のＡｌ２Ｏ３は酸化の安定度が高く、スラグの融点を高めると共にＣｒの酸化をより安定化させ、溶接スラグの溶出Ｃｒ量を低減できることがわかった。 According to the above knowledge, by adding an appropriate amount of F with respect to the Cr amount of the flux-cored wire for stainless steel welding, the eluted Cr of the welding slag can be reduced, and by adding Na and K from the Na compound and K compound, It became clear that the amount of Cr dissolved out of the weld slag can be significantly reduced by adding a small amount of F. Furthermore Al is, Al 2 O 3 in the is oxidized at the time of welding was becomes the slag generated as Al 2 O 3 slag has a high stability of the oxide, is further stabilize the oxidation of Cr to increase the melting point of the slag It was found that the amount of Cr eluted from the welding slag can be reduced.
また製造方法から、溶接スラグの溶出Ｃｒ量低減の検討を行った結果、ワイヤの製造過程で、フラックス入りワイヤ素線を水素ガス雰囲気で焼鈍することにより、Ｃｒの過還元を行い、溶接スラグの溶出Ｃｒ量を更に低減できることを見出した。 In addition, as a result of studying the reduction of the amount of Cr dissolved out of the welding slag from the manufacturing method, the wire cored wire was annealed in a hydrogen gas atmosphere during the wire manufacturing process, so that Cr was excessively reduced. It was found that the amount of eluted Cr can be further reduced.
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次の通りである。
オーステナイト系ステンレス鋼外皮内にフラックスが充填され、該外皮およびフラックスにＣｒを合計で１２〜３２質量％含有するステンレス鋼溶接用フラックス入りワイヤにおいて、ワイヤ全質量に対する質量％で、外皮およびフラックスの合計で、Ａｌを０．００１〜０．２％、フラックスに、金属弗化物のＦ換算値で０．０１〜０．３％、Ｎａ化合物およびＫ化合物のＮａ換算値およびＫ換算値の１種または２種の合計で０．０１〜０．３％含有し、前記Ｃｒ、Ｆ換算値、Ｎａ換算値、Ｋ換算値が下記式のＤ値で７００以下であることを特徴とする。
Ｄ＝Ｃｒ／｛Ｆ×１００×（Ｎａ＋Ｋ）｝・・・・・・（式）
また、フラックス入りワイヤ素線を水素ガス雰囲気で焼鈍することも特徴とする。
This invention is made | formed by the above knowledge, The place made into the summary is as follows.
In a stainless steel welding flux-cored wire in which flux is filled in the austenitic stainless steel outer skin and the outer skin and the flux contain 12 to 32 mass% in total of Cr, the total of the outer skin and the flux in mass% with respect to the total mass of the wire. Then, Al is 0.001 to 0.2%, flux is 0.01 to 0.3% in terms of F of metal fluoride, Na conversion value of Na compound and K compound, and one kind of K conversion value or The total content of the two types is 0.01 to 0.3%, and the Cr, F converted value, Na converted value, and K converted value are 700 or less in terms of the D value of the following formula.
D = Cr / {F × 100 × (Na + K)} (formula)
In addition, the flux-cored wire is annealed in a hydrogen gas atmosphere.
本発明のステンレス鋼溶接用フラックス入りワイヤおよびその製造方法によれば、溶接時に生成する溶接スラグ中の毒性のある溶出Ｃｒ量を低減することができ、溶接スラグの溶出Ｃｒ量による環境汚染を抑制できるという顕著な効果を奏するものである。 According to the flux-cored wire for welding stainless steel of the present invention and the manufacturing method thereof, the amount of toxic dissolved Cr in the weld slag generated during welding can be reduced, and environmental pollution due to the amount of Cr dissolved in the weld slag is suppressed. There is a remarkable effect of being able to.
本発明は、オーステナイト系ステンレス鋼外皮および充填フラックス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 can be achieved by a single effect and a synergistic effect due to the coexistence of each component composition of the austenitic stainless steel skin and the filling flux. The reasons for addition and limitation of each component composition will be described below.
Ｃｒは、ステンレス鋼として最も重要な耐食性を得る目的で添加する。１２質量％（以下、％という。）未満の場合、本発明の狙いである生成した溶接スラグ１００ｇの水への溶出Ｃｒ量が０．１ｍｇ／リットル以下となるため課題とならない。一方、３２％を超えるとワイヤ製造の縮径時に断線して製造できない。従って、Ｃｒは１２〜３２％とする。 Cr is added for the purpose of obtaining the most important corrosion resistance as stainless steel. When the amount is less than 12% by mass (hereinafter referred to as “%”), the amount of Cr dissolved in water of 100 g of the generated weld slag, which is the target of the present invention, is 0.1 mg / liter or less, which is not a problem. On the other hand, if it exceeds 32%, it cannot be produced due to wire breakage when the diameter of the wire is reduced. Therefore, Cr is 12 to 32%.
Ａｌは、溶接時に酸化されてＡｌ２Ｏ３となり溶接スラグ中のＣｒの酸化をより安定化させて溶出Ｃｒ量を低減する目的で外皮およびフラックスに合計で０．００１％以上添加する。Ａｌが０．２％を超えると、ヒュームの発生量が多くなる。従って、Ａｌは外皮およびフラックスに合計で０．００１〜０．２％とする。Ａｌは、外皮およびフラックスから添加するが、フラックスから添加する場合、金属Ａｌ粉、Ａｌ−Ｍｇ合金粉、Ｆｅ−Ａｌ合金粉などが使用できる。 Al is oxidized at the time of welding to become Al 2 O 3 and is added in an amount of 0.001% or more in total to the outer skin and the flux for the purpose of further stabilizing the oxidation of Cr in the welding slag and reducing the amount of Cr eluted. If Al exceeds 0.2%, the amount of fumes generated increases. Therefore, Al is 0.001 to 0.2% in total in the outer skin and the flux. Al is added from the outer shell and the flux, but when added from the flux, metal Al powder, Al-Mg alloy powder, Fe-Al alloy powder, or the like can be used.
フラックス中の金属弗化物のＦ換算値は、溶接スラグの溶出Ｃｒ量を低減する目的で０．０１％以上添加する。金属弗化物のＦ換算値が０．０１％未満の場合においても、Ｎａ化合物およびＫ化合物のＮａ換算値およびＫ換算値の１種または２種の合計の調整により、溶接スラグの溶出Ｃｒ量を低くできるものの、０．１ｍｇ／リットル以下の極低溶出Ｃｒ量を実現するためには、金属弗化物のＦ換算値を０．０１％以上添加する必要がある。一方、０．３％を超えて添加すると、ヒューム発生量が多くなる。従って、金属弗化物のＦ換算値は０．０１〜０．３％とする。金属弗化物として、ＡｌＦ３、ＣａＦ２、ＮａＦ、ＬｉＦなどが使用できる。 The F converted value of the metal fluoride in the flux is added in an amount of 0.01% or more for the purpose of reducing the amount of Cr eluted from the weld slag. Even when the F conversion value of the metal fluoride is less than 0.01%, the dissolved Cr amount of the welding slag can be adjusted by adjusting the Na conversion value of the Na compound and the K compound and the total of one or two of the K conversion values. Although it can be lowered, in order to realize an extremely low eluted Cr amount of 0.1 mg / liter or less, it is necessary to add an F converted value of metal fluoride to 0.01% or more. On the other hand, if it exceeds 0.3%, the amount of generated fume increases. Therefore, the F conversion value of the metal fluoride is set to 0.01 to 0.3%. As the metal fluoride, AlF 3 , CaF 2 , NaF, LiF or the like can be used.
Ｎａ化合物およびＫ化合物のＮａ換算値およびＫ換算値の１種または２種の合計は、Ｆを活性化し、Ｆによる溶接スラグの溶出Ｃｒ量低減効果を活発にする目的で０．０１％以上添加する。０．０１％未満の場合においても、金属弗化物のＦ換算値の増加により、溶接スラグの溶出Ｃｒ量を低くできるものの、０．１ｍｇ／リットル以下の極低溶出Ｃｒ量を実現するためには、Ｎａ化合物およびＫ化合物のＮａ換算値およびＫ換算値の１種または２種の合計で０．０１％以上添加する必要がある。一方、０．３％を超えて添加すると、ヒュームの発生量が多くなる。従って、Ｎａ化合物およびＫ化合物のＮａ換算値およびＫ換算値の１種または２種の合計は０．０１〜０．３％とする。 The total of one or two of Na conversion value and K conversion value of Na compound and K compound added 0.01% or more for the purpose of activating F and activating the effect of reducing the amount of Cr dissolved out of weld slag by F To do. Even in the case of less than 0.01%, although the eluted Cr amount of the weld slag can be reduced by increasing the F conversion value of the metal fluoride, in order to realize an extremely low eluted Cr amount of 0.1 mg / liter or less. It is necessary to add 0.01% or more in total of one or two of Na converted value and K converted value of Na compound and K compound. On the other hand, if it exceeds 0.3%, the amount of fumes generated increases. Therefore, the Na conversion value and the total of one or two of the K conversion values of the Na compound and the K compound are set to 0.01 to 0.3%.
また、Ｃｒ、Ｆ換算値、Ｎａ換算値、Ｋ換算値が下記式のＤ値で７００以下とする。
Ｄ＝Ｃｒ／｛Ｆ×１００×（Ｎａ＋Ｋ）｝・・・（式）
上記式は、ワイヤ中のＣｒ量に対するスラグの溶出Ｃｒ量を低減するための指標Ｄであり、Ｆ、ＮａおよびＫをワイヤのＣｒ量に応じて添加することによって、スラグ中の酸化Ｃｒを３価とし、スラグの溶出Ｃｒ（６価Ｃｒ）量を大幅に低減するに必要な成分間の関係を示している。
Moreover, Cr, F conversion value, Na conversion value, and K conversion value shall be 700 or less by D value of a following formula.
D = Cr / {F × 100 × (Na + K)} (formula)
The above equation is an index D for reducing the amount of Cr eluted in the slag with respect to the amount of Cr in the wire. By adding F, Na and K according to the amount of Cr in the wire, the amount of Cr oxide in the slag is 3 The relationship between the components necessary for significantly reducing the amount of slag elution Cr (hexavalent Cr) is shown.
図１にＤ値と溶接スラグの溶出Ｃｒ量の関係を示す。図１から明らかなようにＤ値が低くなるにしたがい溶出Ｃｒ量を低減できる。Ｃｒ、Ｆ換算値、Ｎａ換算値、Ｋ換算値から算出されるＤ値は、フラックス入りワイヤのＣｒ量に対する溶接スラグの溶出Ｃｒ量を低減するための指標であり、Ｄ値を７００以下とすることによって溶接スラグの溶出Ｃｒ量を大幅に低減することができる。 FIG. 1 shows the relationship between the D value and the amount of dissolved Cr in the weld slag. As is apparent from FIG. 1, the amount of eluted Cr can be reduced as the D value becomes lower. The D value calculated from the Cr, F converted value, Na converted value, and K converted value is an index for reducing the dissolved Cr amount of the weld slag with respect to the Cr amount of the flux cored wire, and the D value is set to 700 or less. As a result, the amount of Cr eluted from the welding slag can be significantly reduced.
金属弗化物のＦ換算値、Ｎａ化合物およびＫ化合物のＮａ換算値およびＫ換算値の１種または２種の合計が適正であっても、Ｄ値が７００を超えるとＦ、Ｎａ、Ｋの相乗効果による溶接スラグの溶出Ｃｒ量低減効果が不十分であり、溶接スラグの溶出Ｃｒ量が多くなる。従ってＤ値は７００以下とする。 Even if the total of one or two of the F converted value of metal fluoride, the Na converted value and K converted value of Na compound and K compound is appropriate, if the D value exceeds 700, the synergistic effect of F, Na and K The effect of reducing the amount of Cr eluted from the weld slag due to the effect is insufficient, and the amount of Cr eluted from the weld slag increases. Accordingly, the D value is 700 or less.
本発明のステンレス鋼溶接用フラックス入りワイヤは、前記成分の他、溶接対象ステンレス鋼板成分および溶接金属の機械的性能を満足するために、ワイヤおよびフラックスの合計でＣ：０．０１〜０．１％、Ｓｉ：０．１〜０．９％、Ｍｎ：０．５〜４．０％、Ｎｉ：６〜２５％、Ｍｏ：５％以下、Ｎ：０．２％以下、Ｃｕ：３％以下を含む。また、フラックスにスラグ剤として、ＴｉＯ２、ＳｉＯ２、ＺｒＯ２、Ａｌ２Ｏ３、ＦｅＯ、Ｆｅ２Ｏ３、ＭｇＯなどを合計で３．０〜１０％程度使用することができる。 In addition to the above components, the flux-cored wire for stainless steel welding of the present invention has a total of C: 0.01 to 0.1 in order to satisfy the mechanical performance of the stainless steel plate component to be welded and the weld metal. %, Si: 0.1 to 0.9%, Mn: 0.5 to 4.0%, Ni: 6 to 25%, Mo: 5% or less, N: 0.2% or less, Cu: 3% or less including. Further, as a slag agent flux, TiO 2, SiO 2, ZrO 2, Al 2 O 3, FeO, Fe 2 O 3, MgO and the like in total it can be used about 3.0 to 10%.
ステンレス鋼溶接用フラックス入りワイヤの製造工程で、フラックス入りワイヤ素線を水素ガス雰囲気で焼鈍することによって、ワイヤ中のＣｒを過剰に還元させ、溶接後に生成するスラグ中の酸化Ｃｒを安定した酸化Ｃｒとすることができる。Ａｒなどの不活性ガス雰囲気やアンモニア分解ガスなどの活性ガス雰囲気および大気雰囲気では、ワイヤ中のＣｒが不安定に酸化され、溶接スラグの溶出Ｃｒ量が多くなる。 In the manufacturing process of stainless steel welding flux cored wire, the flux cored wire is annealed in a hydrogen gas atmosphere, so that Cr in the wire is excessively reduced and stable oxidation of Cr oxide in the slag generated after welding Cr can be used. In an inert gas atmosphere such as Ar, an active gas atmosphere such as ammonia decomposition gas, and an air atmosphere, Cr in the wire is unstablely oxidized, and the amount of Cr eluted from the weld slag increases.
図１にフラックス入りワイヤ素線（１．４ｍｍ径）を水素ガス雰囲気で焼鈍（焼鈍条件１０５０℃×１ｍｉｎ）した場合と焼鈍なしの溶接スラグの溶出Ｃｒ量の測定結果を示す。前記Ｄ値が高い場合においても水素ガス雰囲気で焼鈍することによって溶接スラグの溶出Ｃｒ量が低くなることがわかる。 FIG. 1 shows the measurement results of the amount of Cr eluted from the welded slag without annealing when the flux-cored wire (1.4 mm diameter) is annealed in a hydrogen gas atmosphere (annealing condition: 1050 ° C. × 1 min). It can be seen that even when the D value is high, the amount of Cr eluted from the weld slag is lowered by annealing in a hydrogen gas atmosphere.
フラックス入りワイヤ素線の焼鈍条件は、トンネル型の連続型焼鈍装置や固定炉装置など種々あるが、雰囲気が水素ガスであれば装置形態は問わない。焼鈍温度は８００〜１２００℃程度とし、保持時間はワイヤ径により異なるが、一例として２ｍｍ程度のワイヤ径であれば１分程度行い、その後水冷にて急冷する。長時間焼鈍や複数回の繰り返し焼鈍を行っても、溶着金属性能や溶接作業性には影響しない。 There are various annealing conditions for the flux-cored wire, such as a tunnel-type continuous annealing apparatus and a fixed furnace apparatus, but the apparatus form is not limited as long as the atmosphere is hydrogen gas. The annealing temperature is about 800 to 1200 ° C., and the holding time varies depending on the wire diameter. For example, if the wire diameter is about 2 mm, the annealing is performed for about 1 minute, and then rapidly cooled by water cooling. Even if annealing is performed for a long time or repeated multiple times, the weld metal performance and welding workability are not affected.
以上、本発明のステンレス鋼溶接用フラックス入りワイヤおよびその製造方法の構成要件の限定理由を述べたが、フラックス入りワイヤの製造方法について更に言及すると、例えば外皮を帯鋼より管状に成形する場合には、配合、撹拌、乾燥した充填フラックスをＵ形に成形した溝に充填した後丸形に成形し、所定のワイヤ径まで伸線する。この際、成形した外皮シームを溶接することで、シームレスタイプのフラックス入りワイヤとすることもできる。また外皮がパイプの場合には、パイプを振動させてフラックスを充填し、伸線途中でワイヤ素線を水素ガス雰囲気で焼鈍したのち所定のワイヤ径まで伸線する。 As mentioned above, although the reason for limitation of the constituent requirements of the flux cored wire for stainless steel welding of the present invention and the manufacturing method thereof has been described, when the manufacturing method of the flux cored wire is further described, for example, when the outer skin is formed into a tubular shape from the strip steel Is filled with a mixed, stirred, and dried filling flux into a U-shaped groove, then formed into a round shape, and drawn to a predetermined wire diameter. At this time, a seamless type flux-cored wire can be obtained by welding the formed outer seam. When the outer sheath is a pipe, the pipe is vibrated and filled with flux, and the wire is annealed in a hydrogen gas atmosphere in the middle of wire drawing, and then drawn to a predetermined wire diameter.
充填フラックスは、供給、充填が円滑に行えるように、固着剤（珪酸カリおよび珪酸ソーダの水溶液）を添加してボンドフラックス状にして用いることもできる。 The filling flux can be used in the form of a bond flux by adding a fixing agent (an aqueous solution of potassium silicate and sodium silicate) so that supply and filling can be performed smoothly.
以下、実施例により本発明をさらに詳細に説明する。 Hereinafter, the present invention will be described in more detail with reference to examples.
表１に示す化学成分のオーステナイト系ステンレス鋼外皮を用いて表２に示す組成のステンレス鋼溶接用フラックス入りワイヤを各種試作した。ワイヤ径は１．２ｍｍとした。なお、フラックス充填率は２０〜２３％とした。また、ワイヤ製造時の焼鈍はワイヤ素線径１．４ｍｍで水素ガス雰囲気により１０００℃×１ｍｉｎの条件で行った。 Various types of flux-cored wires for welding stainless steel having the compositions shown in Table 2 were prepared using austenitic stainless steel skins having chemical components shown in Table 1. The wire diameter was 1.2 mm. The flux filling rate was 20-23%. Moreover, annealing at the time of wire manufacture was performed under the condition of 1000 ° C. × 1 min in a hydrogen gas atmosphere with a wire diameter of 1.4 mm.
ヒューム発生量の測定は、ＳＭ４９０鋼の板厚２０ｍｍを用い、ＪＩＳ Ｚ ３９３０に従い、１分間当りのヒューム発生量の測定を行い、７００ｍｇ／ｍｉｎ以下を良好とした。 For the measurement of the amount of generated fumes, a plate thickness of SM490 steel of 20 mm was used, and the amount of generated fumes per minute was measured according to JIS Z 3930.
溶接スラグの溶出Ｃｒ量の測定は、ＳＭ４９０鋼の板厚２０ｍｍを用い、ビードオンプレート溶接を行い、生成したスラグを採取して分析に供した。また採取したスラグは、形および長さが一定ではないため、一旦、めのう乳鉢にて粉砕し、篩い分けした後、０．５〜５．０ｍｍの大きさに揃えてから試験に供した。スラグの溶出Ｃｒ量の分析方法は、産業廃棄物に含まれる金属等の検出方法（昭４８．２．１７環告１３号、以降改正アリ）に準拠した。具体的には、スラグ５０ｇに対して、混合水が合計５００ｃｃになるように蒸留水を混合した。この液を常温常圧で、振とう機により２００回／分で６時間振とうした。 The measurement of the amount of Cr eluted from the weld slag was performed using bead-on-plate welding with a plate thickness of SM490 steel of 20 mm, and the generated slag was collected and used for analysis. Moreover, since the shape and length of the collected slag were not constant, the slag was first pulverized in an agate mortar, sieved, and then adjusted to a size of 0.5 to 5.0 mm before being subjected to the test. The analysis method of the amount of Cr eluted from the slag was based on the detection method of metals and the like contained in industrial waste (Sho 48.2.17 Notification No. 13, revised ant). Specifically, distilled water was mixed with 50 g of slag so that the total amount of mixed water was 500 cc. This solution was shaken at 200 times / minute for 6 hours at room temperature and normal pressure with a shaker.
この液をガラス繊維フィルタ（１μｍ）にてろ過し、溶出検液とした。溶出Ｃｒ量は、０．１ｍｇ／リットル以下を良好とした。 This solution was filtered through a glass fiber filter (1 μm) to obtain an elution test solution. The amount of Cr eluted was set to be 0.1 mg / liter or less.
溶接条件は、溶接電流：１８０〜２５０Ａ、シールドガス：ＣＯ２にて実施した。それらの結果を表２にまとめて示す。 The welding conditions were as follows: welding current: 180 to 250 A, shield gas: CO 2 . The results are summarized in Table 2.
表２中ワイヤＮｏ．１〜５が本発明例、ワイヤＮｏ．６〜１２は比較例である。本発明であるワイヤＮｏ．１〜５は、Ａｌ、金属弗化物のＦ換算値、Ｎａ化合物およびＫ化合物のＮａ換算値およびＫ換算値の合計量およびＤ値が適正であるので、ヒューム発生量が少なくスラグの溶出Ｃｒ量も少ないなど極めて満足な結果であった。 In Table 2, wire No. 1 to 5 are examples of the present invention, wire Nos. 6 to 12 are comparative examples. Wire No. which is the present invention. Nos. 1 to 5 are F-converted values of Al, metal fluoride, Na-converted Na compounds and K-converted Na and K-converted values. The result was extremely satisfactory.
なお、フラックス入りワイヤ製造工程で水素ガス雰囲気での焼鈍をしなかったワイヤＮｏ．５は、ワイヤＮｏ．１〜４に比べて若干スラグの溶出Ｃｒ量が多くなった。 In addition, wire No. which was not annealed in a hydrogen gas atmosphere in the flux-cored wire manufacturing process. 5 is wire No. Compared with 1-4, the amount of slag elution Cr slightly increased.
比較例中ワイヤＮｏ．６は、金属弗化物のＦ換算値が低いので、スラグの溶出Ｃｒ量が多かった。 In the comparative example, the wire No. No. 6 had a large amount of Cr eluted from the slag because the F-converted value of the metal fluoride was low.
ワイヤＮｏ．７は、金属弗化物のＦ換算値が高いので、ヒューム発生量が多かった。 Wire No. No. 7 had a high F-converted value of metal fluoride, and therefore generated a large amount of fumes.
ワイヤＮｏ．８は、Ｎａ化合物およびＫ化合物のＮａ換算値およびＫ換算値の合計量が低いので、スラグからの溶出Ｃｒ量が多かった。 Wire No. No. 8 had a large amount of Cr eluted from the slag because the total amount of Na converted value and K converted value of the Na compound and K compound was low.
ワイヤＮｏ．９は、Ｎａ化合物およびＫ化合物のＮａ換算値およびＫ換算値の合計量高いので、ヒューム発生量が多かった。 Wire No. In No. 9, the total amount of Na converted value and K converted value of the Na compound and K compound was high, so that the amount of fume generation was large.
ワイヤＮｏ．１０は、Ｄ値が高いので、スラグの溶出Ｃｒ量が多かった。 Wire No. No. 10 had a high D value, so the amount of Cr eluted from the slag was large.
ワイヤＮｏ．１１は、Ａｌが低いので、スラグの溶出Ｃｒ量が多かった。 Wire No. No. 11 had a large amount of Cr eluted from the slag because Al was low.
ワイヤＮｏ．１２は、Ａｌが高いので、ヒューム発生量が多かった。 Wire No. No. 12 had a high amount of fumes because Al was high.
Claims (2)
Ｄ＝Ｃｒ／｛Ｆ×１００×（Ｎａ＋Ｋ）｝・・・（式） In a stainless steel welding flux cored wire, flux is filled in the austenitic stainless steel outer shell, and the outer shell and flux contain 12 to 32% by mass of Cr in total. Then, Al is 0.001 to 0.2%, flux is 0.01 to 0.3% in terms of F of metal fluoride, Na conversion value of Na compound and K compound, and one kind of K conversion value or The total content of the two types is 0.01 to 0.3%, and the Cr, F converted value, Na converted value, and K converted value are 700 or less in terms of the D value of the following formula. Flux-cored wire.
D = Cr / {F × 100 × (Na + K)} (formula)
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