JPH07303986A - Wire for gas metal arc welding - Google Patents
Wire for gas metal arc weldingInfo
- Publication number
- JPH07303986A JPH07303986A JP12074694A JP12074694A JPH07303986A JP H07303986 A JPH07303986 A JP H07303986A JP 12074694 A JP12074694 A JP 12074694A JP 12074694 A JP12074694 A JP 12074694A JP H07303986 A JPH07303986 A JP H07303986A
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- Prior art keywords
- wire
- corrosion resistance
- arc welding
- gas
- toughness
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＣＯ2 を含んだ石油、
天然ガス、またはＣＯ2 を輸送するラインパイプの円周
溶接に適するガスメタルアーク溶接ワイヤに関する。特
に溶接金属の耐選択腐食性、低温靱性に優れたガスシー
ルドアーク溶接ワイヤに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to petroleum containing CO 2 .
The present invention relates to a gas metal arc welding wire suitable for circumferential welding of a line pipe that transports natural gas or CO 2 . In particular, the present invention relates to a gas shielded arc welding wire having excellent selective corrosion resistance of weld metal and excellent low temperature toughness.
【０００２】[0002]
【従来の技術】寒冷地やオフショアにおける石油、ガス
輸送用大径ラインパイプに対しては高強度とともに優れ
た低温靱性、現地溶接性が要求される。さらに、近年原
油の２次、３次回収におけるＣＯ2 注入や深井戸化によ
るインヒビター効果の低下によって、ＣＯ2 ガスによる
ラインパイプの腐食が大きな問題となり、耐ＣＯ2 腐食
性が要求されるようになった。2. Description of the Related Art High strength, excellent low temperature toughness and field weldability are required for large diameter line pipes for oil and gas transportation in cold regions and offshore. Further, in recent years, due to a decrease in the inhibitor effect due to CO 2 injection and deep well formation in the secondary and tertiary recovery of crude oil, the corrosion of line pipes due to CO 2 gas has become a major problem, and CO 2 corrosion resistance is required. became.
【０００３】現在までに、ＣＯ2 腐食に関してはＣｒ添
加が有効であることが公表されている（石油技術協会
誌、第５０巻、第２号、図９，１０）。また、例えば特
開平３−２１１２３０号公報において鋼管の母材の耐Ｃ
Ｏ2 腐食性改善にＣｒ添加する方法が提案されている。
しかし、ＣＯ2 を含む腐食環境下で使用されるラインパ
イプ円周溶接部のＣＯ2 腐食、選択腐食抑制を考慮した
ガスメタルアーク溶接方法は開発されていない。Up to now, it has been announced that Cr addition is effective for CO 2 corrosion (Petroleum Technology Association, Vol. 50, No. 2, FIGS. 9 and 10). In addition, for example, in Japanese Patent Laid-Open No. 3-211230, the C resistance of the base material of the steel pipe is
A method of adding Cr for improving O 2 corrosiveness has been proposed.
However, no gas metal arc welding method has been developed in consideration of CO 2 corrosion and selective corrosion inhibition of line pipe circumferential welds used in a corrosive environment containing CO 2 .
【０００４】[0004]
【発明が解決しようとする課題】したがって本発明の目
的とするところは、特に円周溶接金属部のＣＯ2 腐食、
選択腐食の防止とともに、十分な強度と靱性を具備した
溶接金属が得られるガスメタルアーク溶接ワイヤを提供
することにある。Therefore, the object of the present invention is, in particular, CO 2 corrosion of the circumferential weld metal portion,
It is intended to provide a gas metal arc welding wire capable of obtaining a weld metal having sufficient strength and toughness while preventing selective corrosion.
【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、重量％で、Ｃ：０．０１〜０．０６
％、Ｓｉ：０．１０〜０．６０％、Ｍｎ：０．９〜３．
１％、Ｃｕ：０．０５〜０．３０％、Ｃｒ：０．７〜
２．０％、Ｔｉ：０．００５〜０．０６％、Ａｌ：０．
０８％以下を含有し、残部鉄および不可避的不純物から
なる耐炭酸ガス腐食性の優れたガスメタルアーク溶接ワ
イヤである。SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and in% by weight, C: 0.01 to 0.06.
%, Si: 0.10 to 0.60%, Mn: 0.9 to 3.
1%, Cu: 0.05 to 0.30%, Cr: 0.7 to
2.0%, Ti: 0.005 to 0.06%, Al: 0.
It is a gas metal arc welding wire which contains 08% or less and is composed of the balance iron and unavoidable impurities and is excellent in carbon dioxide corrosion resistance.
【０００６】[0006]
【作用】前記課題を解決するために本発明者らはガスメ
タルアーク溶接ワイヤの化学成分を種々変化させて、Ｃ
Ｏ2 と塩水（ＮａＣｌ水溶液）を含む腐食環境中で溶接
部の耐食性、耐選択腐食性と、機械的性質について綿密
な調査を重ねた結果、Ｃの低減かつＣｒ、Ｃｕの添加等
によって溶接金属部の化学成分を調整することにより円
周溶接部の選択腐食を効果的に防止し得るガスメタルア
ーク溶接ワイヤを見いだした。本発明においてガスメタ
ルアーク溶接ワイヤの化学成分の限定理由は以下の通り
である。In order to solve the above-mentioned problems, the present inventors changed the chemical composition of the gas metal arc welding wire variously,
As a result of thorough investigations on the corrosion resistance, selective corrosion resistance and mechanical properties of the welded part in a corrosive environment containing O 2 and salt water (NaCl aqueous solution), the weld metal was reduced by reducing C and adding Cr, Cu, etc. We have found a gas metal arc welding wire that can effectively prevent selective corrosion of circumferential welds by adjusting the chemical composition of the weld. The reasons for limiting the chemical composition of the gas metal arc welding wire in the present invention are as follows.
【０００７】Ｃ：Ｃは良好な機械的性質、作業性を得る
ためにワイヤ中に添加する。０．０１％未満では溶接金
属中の粒界フェライト、フェライトサイドプレートの生
成、さらに結晶粒が粗大化するため強度および靱性が低
下し機械的性質が母材に対して不十分である。また、溶
滴移行が不安定になりスパッタ量が増加する。一方、
０．０６％超にすると溶接金属内のカソードサイトとな
り得る炭化物が増加し耐ＣＯ2 腐食性、耐選択腐食性を
劣化させる。また、溶接金属の強度が母材に対して過大
となり、それによる靱性不足が生ずる。さらに硬さが上
昇するとともに溶接割れ感受性が上昇する。よって０．
０１〜０．０６％の範囲とした。C: C is added to the wire in order to obtain good mechanical properties and workability. If it is less than 0.01%, grain boundary ferrite and ferrite side plates in the weld metal are generated, and the crystal grains are coarsened, so that the strength and toughness are reduced and the mechanical properties are insufficient for the base metal. Further, the droplet transfer becomes unstable and the amount of spatter increases. on the other hand,
If it exceeds 0.06%, the amount of carbides that can serve as a cathode site in the weld metal increases, deteriorating CO 2 corrosion resistance and selective corrosion resistance. In addition, the strength of the weld metal becomes excessive with respect to the base metal, resulting in insufficient toughness. Further, the hardness increases and the weld crack susceptibility increases. Therefore, 0.
The range was 01 to 0.06%.
【０００８】Ｓｉ：Ｓｉは脱酸元素として０．１０％以
上添加する。０．１０％未満では脱酸能力が低下し溶接
作業性が低下する。また、０．６０％超にすると溶接金
属の強度が母材に対して過大となり、それによる靱性不
足が生ずる。さらに硬さが上昇するとともに溶接割れ感
受性が上昇する。よってＳｉ量は０．１０〜０．６０％
とした。Si: Si is added as a deoxidizing element in an amount of 0.10% or more. If it is less than 0.10%, the deoxidizing ability is lowered and the welding workability is lowered. On the other hand, if it exceeds 0.60%, the strength of the weld metal becomes excessive with respect to the base metal, resulting in insufficient toughness. Further, the hardness increases and the weld crack susceptibility increases. Therefore, the Si content is 0.10 to 0.60%
And
【０００９】Ｍｎ：Ｍｎは良好な機械的性質、作業性を
得るためにワイヤ中に添加する。しかし、０．９％未満
では溶接金属の強度が母材に対して不足したり、焼入性
が低下するため靱性が低下する。また、特にＭｎ量が過
度に少ないと脱酸不足によるブローホールが生ずる。一
方、３．１％超にすると溶接金属の硬さが上昇し、強度
が母材に対して過大となり、それによる靱性不足が生ず
る。さらに硬さが上昇する。よって、Ｍｎ量の適正範囲
を０．９〜３．１％とした。Mn: Mn is added to the wire in order to obtain good mechanical properties and workability. However, if it is less than 0.9%, the strength of the weld metal is insufficient with respect to the base metal, and the hardenability deteriorates, so that the toughness decreases. Further, in particular, when the amount of Mn is excessively small, blowholes are generated due to insufficient deoxidation. On the other hand, if it exceeds 3.1%, the hardness of the weld metal increases and the strength becomes excessive with respect to the base metal, resulting in insufficient toughness. The hardness increases further. Therefore, the appropriate range of the amount of Mn was set to 0.9 to 3.1%.
【００１０】Ｃｕ：Ｃｕは本発明では重要な元素であ
る。溶接金属の耐ＣＯ2 腐食性、耐選択腐食性の改善と
良好な機械的性質を得るためにワイヤ中に添加する。特
にＣｒとの複合効果により安定な腐食生成物を形成し、
耐ＣＯ2 腐食性を向上させる。溶接金属の耐選択腐食性
を向上させるためには０．０５％未満ではその効果が得
られない。また、０．３０％超にすると溶接金属の強度
が母材に対して過大となり、それによる靱性不足が生ず
る。さらに硬さが上昇するとともに溶接割れ感受性が上
昇する。よってＣｕ量の適正範囲は０．０５〜０．３０
％とした。なおＣｕは溶接ワイヤにメッキされるが、上
記の量はこれを含んだものである。Cu: Cu is an important element in the present invention. It is added to the wire to improve the CO 2 corrosion resistance and selective corrosion resistance of the weld metal and to obtain good mechanical properties. In particular, a stable corrosion product is formed by the combined effect with Cr,
Improves CO 2 corrosion resistance. In order to improve the selective corrosion resistance of the weld metal, the effect cannot be obtained if it is less than 0.05%. On the other hand, if it exceeds 0.30%, the strength of the weld metal becomes excessive with respect to the base metal, resulting in insufficient toughness. Further, the hardness increases and the weld crack susceptibility increases. Therefore, the appropriate range of Cu content is 0.05 to 0.30.
%. Although Cu is plated on the welding wire, the above amount includes it.
【００１１】Ｃｒ：Ｃｒは溶接金属の耐ＣＯ2 腐食性、
耐選択腐食性の改善と良好な機械的性質を得るためにワ
イヤ中に添加する。Ｃｒは溶接金属の耐選択腐食性を向
上させる有効な元素であり０．７％未満ではその効果が
得られない。また、２．０％超にすると溶接金属の強度
が母材に対して過大となり、それによる靱性不足が生ず
る。さらに硬さが上昇するとともに溶接割れ感受性が上
昇する。よって、Ｃｒ量の適正範囲を０．７〜２．０％
とした。Cr: Cr is the CO 2 corrosion resistance of the weld metal,
It is added to the wire to improve the selective corrosion resistance and to obtain good mechanical properties. Cr is an effective element for improving the selective corrosion resistance of the weld metal, and if it is less than 0.7%, the effect cannot be obtained. On the other hand, if it exceeds 2.0%, the strength of the weld metal becomes excessive with respect to the base metal, resulting in insufficient toughness. Further, the hardness increases and the weld crack susceptibility increases. Therefore, the appropriate range of Cr content is 0.7 to 2.0%.
And
【００１２】Ｔｉ：Ｔｉは溶接金属の低温靱性を確保す
るためにワイヤ中に添加する。Ｔｉはフェライトの微細
化による溶接金属の靱性向上に有効である。しかし、
０．００５％未満にするとその効果が得られない。一
方、０．０６％を超えるとスラグ量が増加し、スラグ巻
き込み等の欠陥の原因となる。よって、Ｔｉ量は０．０
０５〜０．０６％とした。Ti: Ti is added to the wire to ensure the low temperature toughness of the weld metal. Ti is effective in improving the toughness of the weld metal by refining the ferrite. But,
If it is less than 0.005%, the effect cannot be obtained. On the other hand, if it exceeds 0.06%, the amount of slag increases, causing defects such as slag inclusion. Therefore, the Ti amount is 0.0
It was set to 05 to 0.06%.
【００１３】Ａｌ：Ａｌは溶接性を確保するために規制
する。０．０８％を超えるとスラグ量が増加し、スラグ
巻き込み等の欠陥の原因となる。よって、Ａｌ量は０．
０８％以下とした。Al: Al is regulated to secure weldability. If it exceeds 0.08%, the amount of slag increases, causing defects such as slag inclusion. Therefore, the amount of Al is 0.
It was set to 08% or less.
【００１４】なお、不可避不純物の量は少ない方が望ま
しく、特にＰ：０．０３０％以下、Ｓ：０．０３０％以
下、Ｎｂ：０．０２％以下、Ｖ：０．０２％以下、Ｎ
ｉ：３．０％以下、Ｍｏ：１．０％以下、Ｚｒ：０．０
５％以下、Ｂ：０．００２％以下、Ｎ：０．０１％以
下、Ｏ：０．０８％以下の範囲内であれば、溶接金属の
耐ＣＯ2 腐食性および機械的性質を阻害しない。これら
の成分が上記範囲を超える場合には、溶接欠陥の発生
（Ｐ，Ｓ，Ｂ，Ｎ）、機械的性質の低下（Ｎｂ，Ｖ，Ｎ
ｉ，Ｃｕ，Ｍｏ，Ｎ，Ｏ）等の不具合が生ずる。It is desirable that the amount of unavoidable impurities be small, especially P: 0.030% or less, S: 0.030% or less, Nb: 0.02% or less, V: 0.02% or less, N.
i: 3.0% or less, Mo: 1.0% or less, Zr: 0.0
Within the ranges of 5% or less, B: 0.002% or less, N: 0.01% or less, and O: 0.08% or less, the CO 2 corrosion resistance and mechanical properties of the weld metal are not impaired. If these components exceed the above ranges, welding defects (P, S, B, N) and mechanical properties deteriorate (Nb, V, N).
Problems such as i, Cu, Mo, N, O) occur.
【００１５】また、ガスメタルアーク溶接に用いられる
シールドガスの種類、ワイヤ条件等の溶接条件は特に制
限されない。さらに、ガスシールドアーク溶接の適用鋼
種についても、この種の用途に適用できるものであれ
ば、適宜材質のものが可能である。The welding conditions such as the type of shield gas used for gas metal arc welding and the wire conditions are not particularly limited. Further, with respect to the steel type to which the gas shield arc welding is applied, any material can be used as long as it is applicable to this type of application.
【００１６】[0016]
【実施例】次に本発明の実施例を説明する。表１に示す
化学成分の板厚２５ｍｍの供試鋼を外径９１０ｍｍで造
管した後、表２に示す化学成分の溶接ワイヤを用いてガ
スメタルアーク溶接を実施した。ワイヤ径は１．２ｍｍ
を使用し、シールドガスには８０％Ａｒ＋２０％ＣＯ2
を用い溶接入熱１２ｋＪ／ｃｍで溶接した。EXAMPLES Examples of the present invention will be described below. After forming a test steel having a chemical composition shown in Table 1 and a plate thickness of 25 mm with an outer diameter of 910 mm, gas metal arc welding was performed using a welding wire having a chemical composition shown in Table 2. Wire diameter is 1.2mm
80% Ar + 20% CO 2 for the shielding gas
Was used and the welding heat input was 12 kJ / cm.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 [Table 2]
【００１９】その結果を表３に示す。ＹＳ（降伏応力）
はＡＰＩ平型引張を用いて評価し、靱性はＪＩＳ ４号
試験片を用いて−３０℃での吸収エネルギーで評価し
た。溶接割れ発生の有無は溶接後の５断面を観察し評価
した。耐ＣＯ2 腐食性は１０％ＮａＣｌ水溶液にｌａｔ
ｍＣＯ2 をバブリングし８０℃，ｐＨ５．０に調整し、
試験片を９６ｈｒ以上浸漬し評価した。なお、試験片か
ら溶接割れ、溶接欠陥、ブローホール等を極力排除する
よう心がけた。しかしながら、ＡＰＩ引張では採取困難
な場合は測定不可能（表３中の−）とした。The results are shown in Table 3. YS (yield stress)
Was evaluated by using API flat type tension, and toughness was evaluated by the energy absorbed at −30 ° C. using a JIS No. 4 test piece. The presence or absence of weld cracks was evaluated by observing 5 cross sections after welding. CO 2 corrosion resistance is lat in 10% NaCl solution
Bubbling mCO 2 to adjust to 80 ° C and pH 5.0,
The test piece was immersed for 96 hours or more and evaluated. In addition, we tried to eliminate weld cracks, weld defects, blowholes, etc. from the test pieces as much as possible. However, when it was difficult to collect by API tension, measurement was not possible (-in Table 3).
【００２０】[0020]
【表３】 [Table 3]
【００２１】表３に示すように本発明によるガスメタル
アーク溶接ワイヤでの溶接により、溶接性に優れかつ高
強度、高靱性で耐ＣＯ2 腐食性の優れた溶接金属が得ら
れた。しかしながら、ワイヤ１１〜２１は化学成分が適
切でなく、溶接作業性、機械的性質が得られない。ワイ
ヤ１１はＣ量が少なく、強度靱性が不足した。ワイヤ１
２はＣ量が過多で耐ＣＯ2 腐食性が劣化した。ワイヤ１
３はＳｉ量が少なく、ワイヤ１４はＳｉ量が多く溶接性
が悪く、また低温靱性が劣化した。As shown in Table 3, by welding with the gas metal arc welding wire according to the present invention, a weld metal having excellent weldability, high strength, high toughness and excellent CO 2 corrosion resistance was obtained. However, the chemical composition of the wires 11 to 21 is not appropriate, and welding workability and mechanical properties cannot be obtained. The wire 11 had a small amount of C and lacked strength and toughness. Wire 1
In No. 2, the amount of C was excessive and the CO 2 corrosion resistance was deteriorated. Wire 1
No. 3 had a small amount of Si, the wire 14 had a large amount of Si, poor weldability, and low-temperature toughness deteriorated.
【００２２】ワイヤ１５ではＭｎが少ないために、ワイ
ヤ１６ではＭｎが多いためそれぞれ溶接作業性、靱性が
低下した。ワイヤ１７ではＣｒ添加による耐ＣＯ2 腐食
性の向上は見られるが、Ｃｕ量が不足のため耐ＣＯ2 腐
食性が０．４ｍｍ／ｙ以上である。また、ワイヤ１８で
はＣｕ量が多いため靱性が劣化した。ワイヤ１９ではＣ
ｒ量の不足のため耐ＣＯ2 腐食性が劣化した。ワイヤ２
０ではＣｒ量が多いため、ワイヤ２１ではＴｉ量が少な
いためそれぞれ溶接金属の靱性が低下した。また、ワイ
ヤ２２はＴｉ量が、ワイヤ２３ではＡｌ量がそれぞれ多
く靱性が劣化した例である。Since the wire 15 has a small amount of Mn, and the wire 16 has a large amount of Mn, the welding workability and the toughness are deteriorated. In the wire 17, although the CO 2 corrosion resistance is improved by the addition of Cr, the CO 2 corrosion resistance is 0.4 mm / y or more because the amount of Cu is insufficient. In addition, the toughness of the wire 18 deteriorated due to the large amount of Cu. C on wire 19
The CO 2 corrosion resistance deteriorated due to the lack of r content. Wire 2
In No. 0, the amount of Cr is large, and in the wire 21, the amount of Ti is small, so that the toughness of the weld metal deteriorates. In addition, the wire 22 has a large amount of Ti, and the wire 23 has a large amount of Al.
【００２３】[0023]
【発明の効果】以上説明したように、本発明のガスシー
ルドアーク溶接ワイヤを用いて溶接すると高強度、高靱
性を有し、かつ耐溶接割れ性と耐ＣＯ2 腐食性に優れた
溶接金属が得られる。特に、ＣＯ2 を含有する石油、天
然ガスを輸送するラインパイプの溶接に適しており、母
材に対して選択腐食され難い円周溶接金属が得られる。
工業的にその効果の大きい発明である。As described above, when the gas shielded arc welding wire of the present invention is used for welding, a weld metal having high strength, high toughness, and excellent weld crack resistance and CO 2 corrosion resistance can be obtained. can get. In particular, it is suitable for welding line pipes for transporting CO 2 -containing petroleum and natural gas, and a circumferential weld metal that is resistant to selective corrosion with respect to the base metal can be obtained.
It is an invention that is industrially highly effective.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小川 洋之 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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Ogawa 20-1 Shintomi, Futtsu City, Chiba Shin Nippon Steel Co., Ltd. Technology Development Division
Claims (1)
ガス腐食性の優れたガスメタルアーク溶接ワイヤ。1. By weight%, C: 0.01 to 0.06% Si: 0.10 to 0.60% Mn: 0.9 to 3.1% Cu: 0.05 to 0.30% Cr : 0.7 to 2.0% Ti: 0.005 to 0.06% Al: 0.08% or less, and gas metal arc welding excellent in carbon dioxide corrosion resistance, which consists of balance iron and unavoidable impurities Wire.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12074694A JPH07303986A (en) | 1994-05-11 | 1994-05-11 | Wire for gas metal arc welding |
| PCT/JP1995/000412 WO1995024292A1 (en) | 1994-03-11 | 1995-03-13 | Wire for gas metal-arc welding |
| EP95910801A EP0698443A4 (en) | 1994-03-11 | 1995-03-13 | Wire for gas metal-arc welding |
| US08/824,079 US5723089A (en) | 1994-03-11 | 1997-03-24 | Line pipe metal arc welded with wire alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12074694A JPH07303986A (en) | 1994-05-11 | 1994-05-11 | Wire for gas metal arc welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07303986A true JPH07303986A (en) | 1995-11-21 |
Family
ID=14793964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12074694A Pending JPH07303986A (en) | 1994-03-11 | 1994-05-11 | Wire for gas metal arc welding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07303986A (en) |
-
1994
- 1994-05-11 JP JP12074694A patent/JPH07303986A/en active Pending
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