JP2002248598A - Coated welding electrode for high corrosion resistant stainless steel - Google Patents
Coated welding electrode for high corrosion resistant stainless steelInfo
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- JP2002248598A JP2002248598A JP2001050700A JP2001050700A JP2002248598A JP 2002248598 A JP2002248598 A JP 2002248598A JP 2001050700 A JP2001050700 A JP 2001050700A JP 2001050700 A JP2001050700 A JP 2001050700A JP 2002248598 A JP2002248598 A JP 2002248598A
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- Prior art keywords
- stainless steel
- welding rod
- resistant stainless
- high corrosion
- welding
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、海水淡水化プラン
ト，海水熱交換器，屋根，煙突内筒ライニング等に用い
られる高耐食ステンレス鋼の溶接に使用され、母材と同
等の耐食性を有する溶接金属が得られる被覆アーク溶接
棒に係るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for welding high corrosion resistant stainless steel used in seawater desalination plants, seawater heat exchangers, roofs, chimney inner cylinder linings, etc., and has the same corrosion resistance as the base metal. The present invention relates to a coated arc welding rod from which metal is obtained.
【０００２】[0002]
【従来の技術】近年、火力発電プラントでは、可採埋蔵
量が天然ガスの３倍以上ある石炭を燃料とした石炭炊き
プラントの導入が積極的に進められている。煙突内筒の
腐食環境は、ＬＮＧ炊きの場合排ガス中に硫黄などの不
純物がほとんど含まれず、比較的軽度な腐食環境である
が、石炭や石油炊きの場合、比較的低温部において燃焼
ガス中のＳＯ3が 水分と反応して硫酸を発生させ、煙突
内部の全面腐食やスケールとの間隙ですき間腐食が発生
する。この様な強い腐食環境には、Ｃｒ，Ｍｏ含有量の
高い高耐食ステンレス鋼が開発されている。これらの材
料を構造材料として適用する場合、その多くは施工上溶
接が必要となるが、一般に凝固組織のままで使用に供さ
れる溶接部は、Ｍｏ含有量が高いために、溶接金属中に
σ相，χ相等の金属間化合物が生成して延性に乏しく、
ぜい化に起因する割れを生じやすい。2. Description of the Related Art In recent years, in a thermal power plant, the introduction of a coal burning plant using coal whose recoverable reserves are three times or more than natural gas has been actively promoted. The corrosive environment of the chimney inner cylinder is a relatively mild corrosive environment with little impurities such as sulfur in the exhaust gas when cooking with LNG, but the combustion environment in the combustion gas at a relatively low temperature in the case of coal or oil cooking. SO 3 reacts with water to generate sulfuric acid, which causes overall corrosion inside the chimney and crevice corrosion in the gap with the scale. For such a strong corrosive environment, a high corrosion-resistant stainless steel having a high Cr and Mo content has been developed. When these materials are applied as structural materials, most of them require welding in construction, but generally, the welds used for use with a solidified structure have a high Mo content. Intermetallic compounds such as σ phase and χ phase are formed and have poor ductility.
Cracks due to embrittlement are likely to occur.
【０００３】よってこれらの高耐食ステンレス鋼の溶接
に際してはインコネル６２５や特開平８−２５２６９２
号公報に記載のようにインコネル６２５改良の溶接材料
が使用されている。しかしこれらのＮｉを主成分とする
溶接材料は非常に高価であること、またＮを含有するた
め、ブローホールが発生する、スラグの剥離性が悪いと
いう課題があった。[0003] Therefore, when welding these high corrosion resistant stainless steels, Inconel 625 and Japanese Patent Application Laid-Open No. 8-252692 have been proposed.
As described in Japanese Patent Application Publication No. H06-115, an improved welding material of Inconel 625 is used. However, these welding materials containing Ni as a main component are very expensive, and since they contain N, there are problems that blowholes are generated and slag removability is poor.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、高耐食ステ
ンレス鋼の溶接に際し、安価な共金系で母材と同等の耐
食性を有し、溶接のままで延性が良好であり、耐ブロー
ホール性、スラグの剥離性が良好な高耐食ステンレス鋼
溶接用被覆アーク溶接棒を提供することを目的とする。SUMMARY OF THE INVENTION The present invention provides an inexpensive co-metallic material which has the same corrosion resistance as a base metal when welding highly corrosion resistant stainless steel, has good ductility as it is welded, and has good blowhole resistance. It is an object of the present invention to provide a coated arc welding rod for high corrosion resistance stainless steel welding, which has good slag and peelability.
【０００５】[0005]
【課題を解決するための手段】本発明は、前記課題を解
決するものであって、その要旨とするところは以下の通
りである。 （１）オーステナイト系ステンレス鋼を心線とし、心線
と被覆剤の一方又は両者を合計して心線重量比で、Ｃ
：０．０５％（重量％、以下同じ）以下、Ｓｉ：０．
５〜１．６％、Ｎｉ：１６．０〜２５．０％、Ｃｒ：２
０．０〜３４．０％、Ｍｏ：４．０〜７．０％、Ｃｕ：
０．３〜１．８％、Ｎ ：０．２０〜０．３５％、Ａ
ｌ、Ｔｉのうち１種または２種の合計：０．５〜２．０
％を含有し、残部がＦｅ及び不可避的不純物であること
を特徴とする高耐食ステンレス鋼溶接用被覆アーク溶接
棒。 （２）（１）に記載の溶接棒で、心線と被覆剤の一方又
は両者を合計した心線重量比で更に、Ｓ＝Ｓｉ×（Ｃｒ
＋Ｍｏ）／Ｎｉで算出されるＳ値が３．０以下であるこ
とを特徴とする高耐食ステンレス鋼溶接用被覆アーク溶
接棒にある。 （３）前記高耐食ステンレス鋼は重量％で、Ｃｒ：１
８．０〜２５．０％、Ｎｉ：１１．０〜２８．０％、Ｍ
ｏ：２．０〜７．２％を含有し、残部はＦｅ及び不可避
的不純物からなるものである（１）または（２）に記載
の高耐食ステンレス鋼溶接用被覆アーク溶接棒。 （４）（３）に記載の高耐食ステンレス鋼は重量％で、
さらにＣｕ：０．３〜３．０％、Ｎ：０．１〜０．４％
の少なくとも一方を含有するものである高耐食ステンレ
ス鋼溶接用被覆アーク溶接棒。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and its gist is as follows. (1) Austenitic stainless steel is used as a core wire, and one or both of the core wire and the coating agent are added up to obtain a core weight ratio of C
: 0.05% (% by weight, hereinafter the same) or less, Si: 0.
5 to 1.6%, Ni: 16.0 to 25.0%, Cr: 2
0.0 to 34.0%, Mo: 4.0 to 7.0%, Cu:
0.3-1.8%, N: 0.20-0.35%, A
l, total of one or two of Ti: 0.5 to 2.0
%, With the balance being Fe and inevitable impurities. (2) In the welding rod described in (1), furthermore, S = Si × (Cr
+ Mo) / Ni is a coated arc welding rod for high corrosion resistance stainless steel welding, wherein the S value calculated by Ni is 3.0 or less. (3) The high corrosion-resistant stainless steel is expressed by weight%, and Cr: 1.
8.0 to 25.0%, Ni: 11.0 to 28.0%, M
o: The coated arc welding rod for high corrosion resistance stainless steel welding according to (1) or (2), containing 2.0 to 7.2%, with the balance being Fe and unavoidable impurities. (4) The high corrosion-resistant stainless steel described in (3) is in weight%.
Further, Cu: 0.3 to 3.0%, N: 0.1 to 0.4%
A coated arc welding rod for high corrosion resistance stainless steel welding, comprising at least one of the following.
【０００６】[0006]
【発明の実施の形態】本発明の被覆アーク溶接棒が対象
としている被溶接材は本発明の名称にもあるように高耐
食ステンレス鋼である。組織としてはオーステナイト系
のものであるが、オーステナイト系ステンレス鋼の代表
的なものであるＪＩＳ ＳＵＳ３０４（１８Ｃｒ−８Ｎ
ｉ）よりも特に耐食性が優れたものが対象となる。ＪＩ
Ｓ規格には高耐食ステンレス鋼の代表的なものとしてＳ
ＵＳ３１７（１８Ｃｒ−１２Ｎｉ−３．５Ｍｏ）があ
り、さらにこの系統の高耐食ステンレス鋼で特に耐食性
が優れたものとして、ＳＵＳ３１７Ｊ４Ｌ（２２Ｃｒ−
２５Ｎｉ−６Ｍｏ−０．２Ｎ−低Ｃ）やＳＵＳ３１７Ｊ
５Ｌ（２１Ｃｒ−２４．５Ｎｉ−４．５Ｍｏ−１．５Ｃ
ｕ−低Ｃ）などが規定されている。このようなことか
ら、本発明が被溶接材とする高耐食ステンレス鋼はＪＩ
Ｓ ＳＵＳ３１７以上の耐食性を持つステンレス鋼とす
るが、上記のＪＩＳ規格にあるものの他に外国の規格や
鋼材の製造者が定めた規格もある。BEST MODE FOR CARRYING OUT THE INVENTION The material to be welded by the coated arc welding rod of the present invention is a high corrosion-resistant stainless steel as the name of the present invention implies. Although the structure is austenitic, JIS SUS304 (18Cr-8N) which is a typical austenitic stainless steel is used.
Those having particularly excellent corrosion resistance than i) are targeted. JI
The S standard specifies S as a representative of high corrosion resistant stainless steel.
US317 (18Cr-12Ni-3.5Mo). Further, as a highly corrosion-resistant stainless steel of this system, which has particularly excellent corrosion resistance, SUS317J4L (22Cr-
25Ni-6Mo-0.2N-low C) and SUS317J
5L (21Cr-24.5Ni-4.5Mo-1.5C)
u-low C). Therefore, the high corrosion-resistant stainless steel used as the material to be welded by the present invention is JI
Although stainless steel having corrosion resistance of SSUS317 or higher is used, in addition to the above JIS standards, there are also foreign standards and standards set by steel manufacturers.
【０００７】上記高耐食ステンレス鋼の成分としては一
般的に以下のようなものである。すなわち、重量％で、
Ｃｒ：１８．０〜２５．０％、Ｎｉ：１１．０〜２８．
０％、Ｍｏ：２．０〜７．２％を必須の成分とし、必要
に応じてＣｕ：０．３〜３．０％、Ｎ：０．１〜０．４
％の少なくとも一方を成分とするものである。その他Ｆ
ｅ以外にＣ、Ｓｉ、Ｍｎ、Ｐ、Ｓなどを不可避的に含有
するが、特にＣは０．０３％以下と低いことが耐食性の
ために望ましい。[0007] The components of the above high corrosion resistant stainless steel are generally as follows. That is, in weight percent,
Cr: 18.0 to 25.0%, Ni: 11.0 to 28.
0%, Mo: 2.0-7.2% as essential components, and if necessary, Cu: 0.3-3.0%, N: 0.1-0.4.
% As at least one component. Other F
In addition to e, C, Si, Mn, P, S and the like are inevitably contained, and particularly, C is preferably as low as 0.03% or less for corrosion resistance.
【０００８】本発明者らは高耐食ステンレス鋼を被覆ア
ーク溶接するに当たり、溶接棒の合金組成を種々検討し
た。その結果、Ｓｉ，Ｎｉ，Ｃｒ，Ｍｏ量を適正とする
ことで、母材と同等の耐食性を有し、かつσ相，χ相等
の金属間化合物の生成を抑制し、溶接ままでの延性が確
保できるとの知見を得た。ブローホール性の改善には、
脱酸及び脱窒剤の種類及び量を検討し、Ａｌ、Ｔｉの適
正添加により耐ブローホール性が良好になるとの知見を
得た。スラグの剥離性改善の検討を実施し、Ｓｉの添加
が有効であるとの知見を得た。本発明高耐食ステンレス
鋼溶接用被覆アーク溶接棒は以上の知見を基に構成され
たものであり、以下に各組成の数値限定理由を述べる。[0008] The present inventors have studied various alloy compositions of a welding rod in covering arc welding of highly corrosion resistant stainless steel. As a result, by setting the appropriate amounts of Si, Ni, Cr, and Mo, it has the same corrosion resistance as the base material, suppresses the formation of intermetallic compounds such as the σ phase and the χ phase, and reduces the ductility as welded. The knowledge that it can be secured was obtained. In order to improve blowhole properties,
The types and amounts of the deoxidizing and denitrifying agents were examined, and it was found that blowhole resistance was improved by the proper addition of Al and Ti. Investigation of improvement of slag removability was carried out, and it was found that the addition of Si was effective. The coated arc welding rod for high corrosion resistance stainless steel welding of the present invention is constructed based on the above findings, and the reasons for limiting the numerical values of each composition will be described below.
【０００９】ＣはＣｒと結合しやすく結晶粒界にＣｒ炭
化物として析出する。その結果Ｃｒ欠乏層が粒界に形成
され、耐粒界腐食性が劣化する。したがってＣは０．０
５％以下にする必要がある。C is easily bonded to Cr and precipitates at the grain boundaries as Cr carbide. As a result, a Cr-deficient layer is formed at the grain boundary, and the intergranular corrosion resistance is deteriorated. Therefore, C is 0.0
Must be 5% or less.
【００１０】Ｓｉはスラグの剥離性を良くする目的で添
加するが、０．５％未満であるとその効果が不十分であ
る。一方、１．６％を超えて添加するとσ相の析出を助
長して延性を低下させる。したがってＳｉは０．５〜
１．６％にする必要がある。[0010] Si is added for the purpose of improving the slag removability, but if it is less than 0.5%, its effect is insufficient. On the other hand, when it is added in excess of 1.6%, precipitation of the σ phase is promoted and ductility is reduced. Therefore, Si is 0.5 to
It must be 1.6%.
【００１１】Ｎｉはオーステナイト系ステンレス鋼にお
いてオーステナイトを形成させ、また耐食性を確保する
ために必要な元素である。またσ相の析出を抑制する作
用もある。このためには１６．０％以上含有させる必要
がある。しかしながらＮｉは高価な元素であるので多量
の添加は経済性を損なう。したがってＮｉは１６．０〜
２５．０％とした。Ni is an element necessary for forming austenite in austenitic stainless steel and ensuring corrosion resistance. It also has the effect of suppressing the precipitation of the σ phase. For this purpose, it is necessary to contain 16.0% or more. However, since Ni is an expensive element, a large amount of addition impairs economic efficiency. Therefore, Ni is 16.0 to
It was 25.0%.
【００１２】Ｃｒは耐食性を確保するために必要な元素
であり、このためには２０．０％以上含有させる必要が
ある。一方、３４．０％を超えて添加するとσ相などの
金属間化合物が析出しやすくなり、延性を著しく劣化さ
せる。したがってＣｒは２０．０〜３４．０％とした。[0012] Cr is an element necessary for ensuring corrosion resistance, and for this purpose, it is necessary to contain 20.0% or more. On the other hand, if it is added in excess of 34.0%, intermetallic compounds such as the σ phase are likely to precipitate, and the ductility is significantly deteriorated. Therefore, Cr was set to 20.0 to 34.0%.
【００１３】Ｍｏは耐食性、特に塩素イオンを含む液に
対する耐孔食性を向上させるが、４．０未満ではその効
果が不十分である。一方、７．０％を超えて添加すると
金属間化合物が析出し、延性を著しく劣化させる。した
がってＭｏは４．０〜７．０％とした。Mo improves the corrosion resistance, especially the pitting corrosion resistance to a solution containing chloride ions, but if it is less than 4.0, the effect is insufficient. On the other hand, if it is added in excess of 7.0%, an intermetallic compound will precipitate and the ductility will be significantly deteriorated. Therefore, Mo was set to 4.0 to 7.0%.
【００１４】Ｃｕは耐食性を向上させるが、０．３％未
満ではその効果が不十分である。一方、１．８％を超え
て添加すると延性を低下させる。したがってＣｕは０．
３〜１．８％とした。Although Cu improves corrosion resistance, its effect is insufficient if it is less than 0.3%. On the other hand, if it is added in excess of 1.8%, the ductility decreases. Therefore, Cu is 0.
It was set to 3 to 1.8%.
【００１５】Ｎはオーステナイトを安定化し、また強度
を増大させる。しかし０．２０％未満ではその効果が不
十分である。一方、０．３５％を超えて添加すると固溶
できない窒素が窒化物として多量に析出し、延性を低下
させる。したがってＮは０．２０〜０．３５％とした。N stabilizes austenite and increases strength. However, if it is less than 0.20%, the effect is insufficient. On the other hand, if it is added in excess of 0.35%, a large amount of nitrogen that cannot be dissolved is precipitated as nitrides, thereby reducing ductility. Therefore, N was set to 0.20 to 0.35%.
【００１６】Ａｌ、Ｔｉは脱酸剤として使用するが、溶
接金属の脱窒素ガス剤として耐ブローホール性を向上せ
せる。しかしその合計量が０．５％未満であるとその十
分に得ることができない。一方、合計量で２．０％を超
えて添加すると溶接金属中に酸化物や窒化物が多く析出
し、延性が低下する。従ってＡｌ、Ｔｉのうち１種また
は２種の合計を０．５〜２．０％とした。Al and Ti are used as deoxidizing agents, but improve the blowhole resistance as a denitrifying gas agent for the weld metal. However, if the total amount is less than 0.5%, it cannot be obtained sufficiently. On the other hand, if the total amount exceeds 2.0%, a large amount of oxides and nitrides precipitate in the weld metal, and the ductility decreases. Therefore, the total of one or two of Al and Ti is set to 0.5 to 2.0%.
【００１７】さらに本発明の溶接棒においては、Ｓ＝Ｓ
ｉ×（Ｃｒ＋Ｍｏ）／Ｎｉで算出されるＳ値を規定す
る。すなわちＳ値はσ相，χ相等の金属間化合物の生成
指標となり、３．０以下にすることで金属間化合物の生
成が抑制でき、十分な延性が得られる。従ってＳ＝Ｓｉ
×（Ｃｒ＋Ｍｏ）／Ｎｉで算出されるＳ値は３．０以下
にすることが好ましい。Further, in the welding rod of the present invention, S = S
The S value calculated by i × (Cr + Mo) / Ni is defined. That is, the S value serves as an index for the formation of intermetallic compounds such as the σ phase and the に す る phase. By setting the S value to 3.0 or less, the formation of intermetallic compounds can be suppressed and sufficient ductility can be obtained. Therefore, S = Si
The S value calculated from × (Cr + Mo) / Ni is preferably 3.0 or less.
【００１８】以上のように合金成分を特定量に限定する
ことで、安価な共金系で母材と同等の耐食性を有し、溶
接ままで延性が良好であり、耐ブローホール性、スラグ
の剥離性が良好な高耐食ステンレス鋼溶接用被覆アーク
溶接棒を得ることができる。As described above, by limiting the alloy component to a specific amount, an inexpensive metal alloy having the same corrosion resistance as the base material, good ductility as it is welded, blowhole resistance, A coated arc welding rod for welding highly corrosion resistant stainless steel with good peelability can be obtained.
【００１９】なお、本発明において規定する心線重量比
とは、下記の数式で示されるものである。同式中の被覆
剤中の配合比とは被覆剤全重量に対して添加原料が占め
る配合割合を意味し、さらに被覆率とは溶接棒全重量に
対して被覆重量の占める割合を意味する。 心線重量比％＝心線中の含有量％＋被覆剤中の配合比％
×被覆率％／１００The core wire weight ratio defined in the present invention is represented by the following equation. In the formula, the compounding ratio in the coating agent means the mixing ratio of the added material to the total weight of the coating agent, and the coating ratio means the ratio of the coating weight to the total weight of the welding rod. Core wire weight ratio% = content in core wire + blending ratio in coating agent%
X coverage% / 100
【００２０】被覆アーク溶接棒の製造方法について言及
すると、心線と配合・混合した被覆剤を準備してから被
覆剤に固着剤（珪酸カリおよび珪酸ソーダの水溶液）を
添加しながら湿式混合を行い、心線周囲に被覆剤を塗装
する。塗装後これを１５０〜４２０℃で約１〜３時間の
乾燥・焼成を行うことにより製造することができる。Referring to the method of manufacturing a coated arc welding rod, a coating agent mixed and mixed with a core wire is prepared, and then wet mixing is performed while adding a fixing agent (aqueous solution of potassium silicate and sodium silicate) to the coating agent. Then, coat the coating around the core wire. After coating, it can be manufactured by drying and firing at 150 to 420 ° C. for about 1 to 3 hours.
【００２１】[0021]
【実施例】表１に使用した母材の化学成分を示す。母材
はＡＳＴＭ Ａ２４０ Ｓ３１２５４相当の高耐食ステ
ンレス鋼である。表２に供試心線の化学成分を示す。表
３〜表５に供試心線と被覆剤の組み合わせによる被覆ア
ーク溶接棒の組成を示す。表３〜表５中のその他スラグ
剤は、ＣａＯ、ＦｅＯ、ＭｇＯ、Ａｌ2Ｏ3等である。EXAMPLES Table 1 shows the chemical components of the base material used. The base material is a high corrosion resistant stainless steel corresponding to ASTM A240 S31254. Table 2 shows the chemical components of the test core wire. Tables 3 to 5 show the compositions of the coated arc welding rods by the combination of the test core wire and the coating agent. Tables 3 other slug agent 5 is CaO, FeO, MgO, Al 2 O 3 or the like.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】[0024]
【表３】 [Table 3]
【００２５】[0025]
【表４】 [Table 4]
【００２６】[0026]
【表５】 [Table 5]
【００２７】溶接方法は、棒径３．２ｍｍの溶接棒を用
い、溶接電流７０〜１００Ａ（ＡＣ）、アーク電圧２０
〜２５Ｖ、溶接速度１００〜２００ｍｍ／ｍｉｎで、図
１に示す開先形状の試験板を横向姿勢で溶接した。この
溶接した試験板についてスラグの剥離性を調査した。ま
た耐ブローホール性はＸ線透過試験を実施し、ＪＩＳ
Ｚ ３１６０の等級分類で判定し、１級を良好とした。
延性はＪＩＳ Ｚ ３１２２の表曲げ試験片によりＲ＝
２ｔ，曲げ角度６０°で欠陥の有無を調査し、無欠陥を
良好とした。The welding method uses a welding rod having a rod diameter of 3.2 mm, a welding current of 70 to 100 A (AC), and an arc voltage of 20.
At 25 to 25 V and a welding speed of 100 to 200 mm / min, the grooved test plate shown in FIG. The slag peelability of the welded test plate was investigated. In addition, the blow hole resistance was measured by conducting an X-ray transmission test.
Judgment was made according to the grade classification of Z3160, and the first grade was regarded as good.
The ductility was calculated as R = according to the JIS Z 3122 table bending test piece.
The presence or absence of a defect was examined at 2t and a bending angle of 60 °, and no defect was evaluated as good.
【００２８】耐食性試験は、石炭炊き煙突内筒の擬似環
境として６．５％ＳＯ4 -2 ＋３５０ｐｐｍＦ- ＋２．０
％Ｃｌ- 、ｐＨ３．０、８０℃における隙間腐食再不動
態化電位（ＥR，CREV）を測定した。ＥR，CREVは高いほ
ど耐食性が良好なことを示し、母材と同等の耐食性であ
る−２００ｍＶ以上を良好とした。The corrosion resistance test, 6.5% SO 4 -2 + 350ppmF as a pseudo environment of coal-fired chimney inner tube - +2.0
The crevice corrosion repassivation potential (E R , CREV ) at 80 ° C.,% Cl − , pH 3.0 was measured. The higher E R and CREV were, the better the corrosion resistance was. The corrosion resistance equivalent to the base metal was −200 mV or more.
【００２９】各試験結果を表６、表７に示す。表中溶接
棒Ｎｏ．１〜１２が本発明、溶接棒Ｎｏ．１３〜２４が
比較例である。本発明である溶接棒Ｎｏ．１〜１２は、
心線重量比でＣ、Ｓｉ、Ｎｉ、Ｃｒ、Ｍｏ、Ｃｕ、Ｎ、
Ｓ値、及びＡｌ、Ｔｉのうち１種または２種の合計量が
適正であるのでスラグの剥離性、耐ブローホール性、延
性、耐食性、経済性が良好であった。Tables 6 and 7 show the test results. Welding rod No. in the table. Nos. 1 to 12 of the present invention, welding rod No. 13 to 24 are comparative examples. The welding rod No. 1 to 12
C, Si, Ni, Cr, Mo, Cu, N,
Since the S value and the total amount of one or two of Al and Ti were appropriate, the slag removability, blowhole resistance, ductility, corrosion resistance, and economy were good.
【００３０】[0030]
【表６】 [Table 6]
【００３１】[0031]
【表７】 [Table 7]
【００３２】比較例中溶接棒Ｎｏ．１３は、Ｃが高いた
め耐食性が悪く、またＡｌ、Ｔｉのうち１種または２種
の合計が低いため耐ブローホール性が悪かった。また溶
接棒Ｎｏ．１４はＮｉが高いため経済性を損なう。また
溶接棒Ｎｏ．１５はＭｏが高いため延性が低い。In the comparative example, welding rod No. In No. 13, the corrosion resistance was poor due to high C, and the blowhole resistance was poor due to the low total of one or two of Al and Ti. In addition, welding rod No. No. 14 impairs economic efficiency due to high Ni. In addition, welding rod No. No. 15 has low ductility due to high Mo.
【００３３】溶接棒Ｎｏ．１６はＳｉが高くため延性が
低く、またＣｕが低いため耐食性が悪かった。また溶接
棒Ｎｏ．１７はＮｉが低いため、また溶接棒Ｎｏ．１８
はＭｏが低いためそれぞれ耐食性が悪い。、また溶接棒
Ｎｏ．１９はＳｉが低いためスラグの剥離性が悪く、ま
たＣｒが高いため延性が低い。The welding rod No. No. 16 had low ductility due to high Si, and poor corrosion resistance due to low Cu. In addition, welding rod No. No. 17 is low in Ni, and welding rod no. 18
Are low in corrosion resistance due to low Mo. , And welding rod No. No. 19 has low slag removability due to low Si, and low ductility due to high Cr.
【００３４】溶接棒Ｎｏ．２０はＮが低いため耐食性が
悪く、またＡｌ、Ｔｉのうち１種または２種の合計が高
いため延性が低い。また溶接棒Ｎｏ．２１はＳ値が高い
ため延性が低く、溶接棒Ｎｏ．２２はＣｒが低いため耐
食性が悪い。また溶接棒Ｎｏ．２３はＮが高いため、ま
た溶接棒Ｎｏ．２４はＣｕが高いためそれぞれ延性が低
い。The welding rod No. No. 20 has low corrosion resistance due to low N, and has low ductility due to high sum of one or two of Al and Ti. In addition, welding rod No. No. 21 has a low S value due to a high S value. Sample No. 22 has low corrosion resistance due to low Cr. In addition, welding rod No. No. 23 has a high N, and the welding rod No. No. 24 has low ductility because of high Cu.
【００３５】[0035]
【発明の効果】以上のように本発明によれば高耐食ステ
ンレス鋼の溶接に際し、安価な共金系で母材と同等の耐
食性を有し、溶接のままで延性が良好であり、耐ブロー
ホール性、スラグの剥離性が良好な高耐食ステンレス鋼
溶接用被覆アーク溶接棒を提供することができる。As described above, according to the present invention, when welding highly corrosion-resistant stainless steel, it is an inexpensive co-metal and has the same corrosion resistance as the base material, has good ductility as it is, and has good blow resistance. It is possible to provide a coated arc welding rod for welding high-corrosion-resistant stainless steel, which has good hole properties and slag peeling properties.
【図１】本発明の実施例に用いた溶接試験板を示す図FIG. 1 is a diagram showing a welding test plate used in an example of the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 井上 裕滋 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 Ｆターム(参考） 4E084 AA02 AA03 AA04 AA09 AA20 AA26 AA39 BA04 BA05 BA06 BA08 BA09 BA10 BA11 CA16 CA26 DA01 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroshi Inoue 20-1 Shintomi, Futtsu-shi, Chiba F-term in the Technology Development Division of Nippon Steel Corporation (reference) 4E084 AA02 AA03 AA04 AA09 AA20 AA26 AA39 BA04 BA05 BA06 BA08 BA09 BA10 BA11 CA16 CA26 DA01
Claims (4)
し、心線と被覆剤の一方又は両者を合計して心線重量比
で、 Ｃ ：０．０５％（重量％、以下同じ）以下、 Ｓｉ：０．５〜１．６％、 Ｎｉ：１６．０〜２５．０％、 Ｃｒ：２０．０〜３４．０％、 Ｍｏ：４．０〜７．０％、 Ｃｕ：０．３〜１．８％、 Ｎ ：０．２０〜０．３５％、 Ａｌ、Ｔｉのうち１種または２種の合計：０．５〜２．
０％ を含有し、残部がＦｅ及び不可避的不純物であることを
特徴とする高耐食ステンレス鋼溶接用被覆アーク溶接
棒。An austenitic stainless steel is used as a core wire, and one or both of the core wire and the coating agent are combined to obtain a core weight ratio of C: 0.05% (% by weight, the same applies hereinafter), Si: 0.5-1.6%, Ni: 16.0-25.0%, Cr: 20.0-34.0%, Mo: 4.0-7.0%, Cu: 0.3-1. 8%, N: 0.20 to 0.35%, Total of one or two of Al and Ti: 0.5 to 2.
A coated arc welding rod for welding highly corrosion resistant stainless steel, characterized by containing 0% and the balance being Fe and inevitable impurities.
剤の一方又は両者を合計した心線重量比で更に、Ｓ＝Ｓ
ｉ×（Ｃｒ＋Ｍｏ）／Ｎｉで算出されるＳ値が３．０以
下であることを特徴とする高耐食ステンレス鋼溶接用被
覆アーク溶接棒。2. The welding rod according to claim 1, wherein one or both of the core wire and the coating agent are further expressed as S = S
A coated arc welding rod for high corrosion resistance stainless steel welding, wherein an S value calculated by i × (Cr + Mo) / Ni is 3.0 or less.
ｒ：１８．０〜２５．０％、Ｎｉ：１１．０〜２８．０
％、Ｍｏ：２．０〜７．２％を含有し、残部はＦｅ及び
不可避的不純物からなるものである請求項１または２に
記載の高耐食ステンレス鋼溶接用被覆アーク溶接棒。3. The stainless steel according to claim 1, wherein said high corrosion resistant stainless steel is
r: 18.0 to 25.0%, Ni: 11.0 to 28.0
%, Mo: 2.0 to 7.2%, the balance being Fe and unavoidable impurities, the coated arc welding rod for highly corrosion resistant stainless steel welding according to claim 1 or 2.
重量％で、さらにＣｕ：０．３〜３．０％、Ｎ：０．１
〜０．４％の少なくとも一方を含有するものである高耐
食ステンレス鋼溶接用被覆アーク溶接棒。4. The high corrosion-resistant stainless steel according to claim 3, further comprising: Cu: 0.3-3.0%, N: 0.1% by weight.
A coated arc welding rod for high corrosion resistance stainless steel welding containing at least one of 0.4% and 0.4%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100486751C (en) * | 2007-04-05 | 2009-05-13 | 中国科学院广州电子技术研究所 | Nickel wire and copper wire welding method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5080941A (en) * | 1973-11-22 | 1975-07-01 | ||
| JPH03142099A (en) * | 1989-10-26 | 1991-06-17 | Nippon Steel Corp | Coated arc welding rod for stainless steel |
| JPH08252692A (en) * | 1995-03-15 | 1996-10-01 | Nippon Steel Corp | Coated electrode for highly corrosion resistant and high mo stainless steel |
| JP2000052089A (en) * | 1998-08-14 | 2000-02-22 | Nippon Steel Corp | Austenite system stainless steel filler rod with excellent high temperature characteristic |
-
2001
- 2001-02-26 JP JP2001050700A patent/JP4698857B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5080941A (en) * | 1973-11-22 | 1975-07-01 | ||
| JPH03142099A (en) * | 1989-10-26 | 1991-06-17 | Nippon Steel Corp | Coated arc welding rod for stainless steel |
| JPH08252692A (en) * | 1995-03-15 | 1996-10-01 | Nippon Steel Corp | Coated electrode for highly corrosion resistant and high mo stainless steel |
| JP2000052089A (en) * | 1998-08-14 | 2000-02-22 | Nippon Steel Corp | Austenite system stainless steel filler rod with excellent high temperature characteristic |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100486751C (en) * | 2007-04-05 | 2009-05-13 | 中国科学院广州电子技术研究所 | Nickel wire and copper wire welding method |
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|---|---|
| JP4698857B2 (en) | 2011-06-08 |
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