JPH01100247A - Austenitic corrosion-resisting cast steel - Google Patents
Austenitic corrosion-resisting cast steelInfo
- Publication number
- JPH01100247A JPH01100247A JP25692087A JP25692087A JPH01100247A JP H01100247 A JPH01100247 A JP H01100247A JP 25692087 A JP25692087 A JP 25692087A JP 25692087 A JP25692087 A JP 25692087A JP H01100247 A JPH01100247 A JP H01100247A
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- cast steel
- steel
- casting
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 15
- 238000005260 corrosion Methods 0.000 claims abstract description 29
- 230000007797 corrosion Effects 0.000 claims abstract description 29
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract 3
- 239000000463 material Substances 0.000 abstract description 17
- 238000003466 welding Methods 0.000 abstract description 16
- 238000005266 casting Methods 0.000 abstract description 13
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 18
- 238000005336 cracking Methods 0.000 description 17
- 239000011324 bead Substances 0.000 description 11
- 239000010955 niobium Substances 0.000 description 10
- 239000011651 chromium Substances 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 229910001293 incoloy Inorganic materials 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- UNASZPQZIFZUSI-UHFFFAOYSA-N methylidyneniobium Chemical compound [Nb]#C UNASZPQZIFZUSI-UHFFFAOYSA-N 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 229910001119 inconels 625 Inorganic materials 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- -1 chlorine ions Chemical class 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、天然ガスの生産井および輸送パイプラインに
おけるマニホールド管、レジューサ−管などの配管材料
等として有用な耐食鋳鋼に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a corrosion-resistant cast steel useful as a piping material for manifold pipes, reducer pipes, etc. in natural gas production wells and transportation pipelines.
天然ガスの生産井や輸送ライン等における配管材は、Ｈ
２Ｓ、ＣＯｚ、ＣＩ−等を含む腐食環境に対する安定し
た耐食性が必要である。その耐食配管材料として従来よ
り、オーステナイト系耐食合金である「インコロイ８２
５Ｊ 合金鋼（Ｃ：０．０５％以下、Ｓｔ：０．５％以
下、Ｍｎ：１％以下、 Ｃｒ： １９．５〜２３．５％
、 Ｎ ｉ ： ３Ｂ〜４６％、Ｍｏ：２．３〜３．
５％、 Ｃｕ ：１．５〜３．０％、 Ｔｉ ：０
．６〜１．２％、Ａ１：０．２％以下、残部Ｆｅ）が使
用されている。この合金からなる管体は、インゴットを
素材とし、鍛圧工程を経て製造されるのが一般である。Piping materials for natural gas production wells, transportation lines, etc.
Stable corrosion resistance against corrosive environments including 2S, COz, CI-, etc. is required. Incoloy 82, an austenitic corrosion-resistant alloy, has traditionally been used as a corrosion-resistant piping material.
5J Alloy steel (C: 0.05% or less, St: 0.5% or less, Mn: 1% or less, Cr: 19.5-23.5%
, Ni: 3B-46%, Mo: 2.3-3.
5%, Cu: 1.5-3.0%, Ti: 0
．． 6 to 1.2%, A1: 0.2% or less, balance Fe) is used. A tube body made of this alloy is generally manufactured from an ingot through a forging process.
近年、上記インコロイ８２５合金の鋳造材として、Ｔｉ
をＮｂに置換したものが実用に供されている。この合金
は鋳造合金であり、その配管材は、鍛圧法に比し工程が
簡素な遠心力鋳造法等によりマニホールド管のような比
較的複雑な形状を有するものや、小口径から大口径に到
る任意の鋳造サイズのものを比較的容易に製造すること
ができる。In recent years, Ti has been used as a casting material for the above Incoloy 825 alloy.
Substituents in which Nb is substituted are in practical use. This alloy is a cast alloy, and its piping materials can be made into relatively complex shapes such as manifold pipes, or from small diameters to large diameters, by centrifugal casting, which is a simpler process than the forging method. It is relatively easy to manufacture any casting size.
上記インコロイ８２５鋳造材を鋳造して得られる配管材
は、溶接割れ感受性が高く、ビードと母材との境界部や
溶接熱影響部、あるいはビード下の熱影響部等に、０．
１〜１１１程度のミクロクラックが生じ易いという問題
がある。そのミクロクランクは結晶粒界に沿って生じる
粒界割れである。Piping materials obtained by casting the above-mentioned Incoloy 825 casting material have a high weld crack susceptibility, and 0.0% is generated at the boundary between the bead and the base metal, the weld heat affected zone, or the heat affected zone under the bead.
There is a problem in that microcracks of about 1 to 111 are likely to occur. The microcrank is a grain boundary crack that occurs along grain boundaries.
溶接部にこのようなミクロクラックを内包する配管材を
以て組立てられた配管ラインは、ミクロクランクを起点
とする溶接継手強度の著しい低下を避けることができず
、配管ラインとしての信頷性に欠けたものとなる。Piping lines assembled using piping materials containing such microcracks in the welded parts cannot avoid a significant decrease in the strength of the welded joints starting from the microcranks, and lack reliability as piping lines. Become something.
上記オーステナイト系耐食合金が溶接割れに対して高い
感受性を示すのは、Ｃが０．０５％以下と極めて低いた
め、鋳造材の結晶粒が粗大化し易く、その粗大化した結
晶組織の粒界に低融点不純物（Ｐ、Ｓ、０等）が偏析濃
化することに主として起因している。この低融点不純物
の混在量を可及的に少なくすることは、溶接割れ抵抗性
を改善する一つの方法ではあるが、それだけでは十分な
対策となり得す、溶接継手部のミクロクラックの完全な
防止は不可能である。The reason why the above-mentioned austenitic corrosion-resistant alloy shows high susceptibility to weld cracking is that the C content is extremely low at 0.05% or less, so the crystal grains of the cast material tend to coarsen, and the grain boundaries of the coarsened crystal structure This is mainly due to the segregation and concentration of low melting point impurities (P, S, 0, etc.). One way to improve weld cracking resistance is to reduce the amount of low melting point impurities as much as possible, but it alone may be a sufficient measure to completely prevent microcracks in welded joints. is impossible.
本発明は上記に鑑み、天然ガスの生産井や輸送ラインに
使用される配管材として必要な高耐食性と、溶接部の粒
界割れ抵抗性にすぐれたオーステナイト系耐食鋳鋼を提
供するものである。In view of the above, the present invention provides an austenitic corrosion-resistant cast steel that has the high corrosion resistance necessary as a piping material used in natural gas production wells and transportation lines, and has excellent resistance to intergranular cracking in welded parts.
〔問題点を解決するための手段および作用〕本発明のオ
ーステナイト系耐食鋳鋼は、Ｃ：０．０３〜０．１％、
Ｓ ｉ：０．５〜１．５％、Ｍｎ：０，３〜１．５
％、ｐ：０．０２％以下、ｓ：０．０２％以下、Ｎｉ：
３５〜５０％、 Ｃｒ ： １８〜２５％、Ｍｏ：２
〜４％。[Means and effects for solving the problems] The austenitic corrosion-resistant cast steel of the present invention contains C: 0.03 to 0.1%,
Si: 0.5-1.5%, Mn: 0.3-1.5
%, p: 0.02% or less, s: 0.02% or less, Ni:
35-50%, Cr: 18-25%, Mo: 2
~4%.
Ｃｕ：１〜３％、 Ｎ ｂ ：０．５〜１．５％、ｏ：
ｏ、ｏｉ％以下、Ｎ：０．０４％以下、残部実質的にＦ
ｅからなる化学成分組成を有している。Cu: 1-3%, Nb: 0.5-1.5%, o:
o, oi% or less, N: 0.04% or less, remainder substantially F
It has a chemical composition consisting of e.
本発明耐食鋳鋼における成分組成上の最も特徴とする点
は、高Ｃ・高Ｎｂ組成とすると共に、不純物元素である
ＯおよびＮ３Ｊを低レベルに抑えていることである。本
発明の耐食鋳鋼は、上記高Ｃ・高Ｎｂ組成により粒界に
分散析出するニオブ炭化物（ＮｂＣ）が粒界の割れ発生
抑制作用をなし、また高Ｎｂ化による結晶粒の微細化と
、不純物元素である０およびＮｉｔの抑制に伴う粒界強
化効果等により、溶接割れ感受性を著しく低下させてい
るのである。The most characteristic feature of the corrosion-resistant cast steel of the present invention in terms of its composition is that it has a high C and high Nb composition, and that impurity elements O and N3J are suppressed to low levels. In the corrosion-resistant cast steel of the present invention, niobium carbide (NbC), which is dispersed and precipitated at the grain boundaries due to the above-mentioned high C/high Nb composition, has the effect of suppressing the occurrence of cracking at the grain boundaries. The susceptibility to weld cracking is significantly reduced due to the grain boundary strengthening effect associated with the suppression of the elements O and Ni.
なお、本発明耐食鋳鋼は、鋳造後、１１８０〜１２２０
℃に適当時間（例えば、１〜３Ｈｒ）加熱保持する安定
化処理が施されることにより、所定の高耐食性と共に、
高位の安定した溶接割れ抵抗性が付与される。In addition, the corrosion-resistant cast steel of the present invention has a temperature of 1180 to 1220 after casting.
By performing a stabilization treatment of heating and holding at a temperature of
Provides high and stable weld cracking resistance.
以下、本発明耐食鋳鋼の成分限定理由を説明する。The reasons for limiting the components of the corrosion-resistant cast steel of the present invention will be explained below.
Ｃ： ０．０３〜０．１％
Ｃは、鋳造凝固過程、およびその後の安定化熱処理にお
いてＮｂと結合してＮｂＣを形成する。C: 0.03 to 0.1% C combines with Nb to form NbC during the casting solidification process and subsequent stabilization heat treatment.
このＮｂＣが結晶粒界に析出することにより割れ感受性
が低下する。この効果を確保するためには、少なくとも
０．０３％を必要とする。より好ましくは、０．０６％
以上である。しかし、０．１％をこえると、結晶粒界付
近のＣｒ濃度の減少（クロム炭化物の生成）による耐食
性の低下をきたし、例えば、沸騰硝酸水溶液中での腐食
抵抗性が損なわれるので、０．１％を越えてはならない
。This NbC precipitates at grain boundaries, reducing cracking susceptibility. To ensure this effect, at least 0.03% is required. More preferably 0.06%
That's all. However, if it exceeds 0.1%, the corrosion resistance will decrease due to a decrease in the Cr concentration near the grain boundaries (formation of chromium carbide), and for example, the corrosion resistance in boiling nitric acid aqueous solution will be impaired. Must not exceed 1%.
Ｓｉ：０，５〜１．５％
Ｓｔは溶鋼の脱酸元素として、また鋳造時の溶鋼の湯流
れ性を高めるために、０．５％以上を必要とする。しか
し、１．５％を越えると溶接性が悪くなるので、１．５
％を上限とする。Si: 0.5 to 1.5% St is required to be 0.5% or more as a deoxidizing element for molten steel and to improve the flowability of molten steel during casting. However, if it exceeds 1.5%, weldability deteriorates, so 1.5%
The upper limit is %.
Ｍｎ：０．３〜１．５％
ＭｎはＳｉと同様に溶鋼の脱酸元素として必要であり、
また鋼中の不純物であるＳをＭｎＳとして固定すること
より溶接割れ感受性を低下させる効果を有するやこのた
めに少なくとも０．３％を必要とするが、１．５％をこ
えるとその効果はほぼ飽和する。よって、０．３〜１．
５％とする。Mn: 0.3-1.5% Mn is necessary as a deoxidizing element for molten steel like Si,
Furthermore, by fixing S, which is an impurity in steel, as MnS, it has the effect of reducing weld cracking susceptibility.For this purpose, at least 0.3% is required, but if it exceeds 1.5%, the effect is almost negligible. saturate. Therefore, 0.3 to 1.
5%.
Ｐ ７０．０２％以下、Ｓ ： ０．０２％以下Ｐおよ
びＳは、結晶粒界に偏析し、粒界強度を弱める有害不純
物元素であるので、それぞれ０．０２％を上限とする。P: 70.02% or less, S: 0.02% or less P and S are harmful impurity elements that segregate at grain boundaries and weaken grain boundary strength, so the upper limit is 0.02% for each.
Ｎｉ：３５〜５０％
Ｎｉはオーステナイト生成元素であり、安定なオーステ
ナイト組織を形成する。また、Ｈｚ Ｓを含む環境での
耐応力腐食割れ抵抗性を高める効果を有する。これらの
効果を確保するには少なくとも３５％を必要とする。添
加量の増加に伴ってその効果は増大するが、５０％をこ
えると効果はほぼ飽和し、それ以上の添加は経済性を損
なうので５０％を上限とする。Ni: 35-50% Ni is an austenite-forming element and forms a stable austenite structure. It also has the effect of increasing stress corrosion cracking resistance in an environment containing HzS. At least 35% is required to ensure these effects. The effect increases as the amount added increases, but if it exceeds 50%, the effect is almost saturated, and adding more than that impairs economic efficiency, so the upper limit is set at 50%.
Ｃｒ：１８〜２５％
Ｃｒは、耐食性向上元素であり、１８％以上の添加によ
り耐粒界腐食性が高められる。添加量を増すとともに、
その効果は増大するが、２５％を越えると靭性が低下す
るので、２５％を上限とする。Cr: 18-25% Cr is an element that improves corrosion resistance, and by adding 18% or more, intergranular corrosion resistance is improved. As the amount of addition increases,
The effect increases, but if it exceeds 25%, the toughness decreases, so 25% is the upper limit.
Ｍｏ：２〜４％
ＭＯは耐腐食性改善に有効な元素であり、また硫化物を
含む溶液中での耐食性の向上に奏効する。Mo: 2-4% MO is an element effective in improving corrosion resistance, and is also effective in improving corrosion resistance in solutions containing sulfides.
その効果は２％以上の添加により得られるが、４％をこ
えると、靭性が低くなるので、２〜４％とする。This effect can be obtained by adding 2% or more, but if it exceeds 4%, the toughness decreases, so the content is set at 2 to 4%.
Ｃｕｒｌ〜３％
Ｃｕは、耐全面腐食性を高める元素であり、また硫化物
溶液中での耐食性の向上に奏効する。この効果は１％以
上の添加により得られるが、３％をこえると、金属間化
合物の生成による脆化を招くので、１〜３％とする。Curl ~ 3% Cu is an element that improves general corrosion resistance, and is also effective in improving corrosion resistance in sulfide solutions. This effect can be obtained by adding 1% or more, but if it exceeds 3%, embrittlement occurs due to the formation of intermetallic compounds, so the content is set at 1 to 3%.
Ｎｂ：０．５〜１．５％
Ｎｂは、本発明鋳鋼の鋳造凝固過程、およびその後に行
われる安定化熱処理において、Ｃと結合し結晶粒界にＮ
ｂＣを形成することにより粒界割れ抵抗性を高める。ま
た、粒界でＮｂＣが形成されることにより、ＣｒとＣの
結合による粒界のＣｒ濃度の減少とそれに伴う耐食性の
低下が抑制される。更にＮｂは結晶粒微細化効果を有し
、その微細化に伴って粒界への低融点不純物（Ｐ、Ｓ。Nb: 0.5-1.5% Nb combines with C and forms N at grain boundaries during the casting solidification process of the cast steel of the present invention and the subsequent stabilization heat treatment.
By forming bC, grain boundary cracking resistance is enhanced. Furthermore, the formation of NbC at the grain boundaries suppresses a decrease in the Cr concentration at the grain boundaries due to the combination of Cr and C and a corresponding decrease in corrosion resistance. Furthermore, Nb has the effect of refining grains, and as the grains become finer, low melting point impurities (P, S, etc.) are introduced into the grain boundaries.
０）等の偏析濃度が希釈されることにより粒界強化の効
果が得られる。これらの効果を確保するためのＮｂ量は
少なくとも０．５％であることを要する。その量の増加
に伴って効果の増大をみる。好ましくは、０．７％以上
とする。但し、１．５％をこえると却って溶接割れ感受
性が高くなるので、１．５％を越えてはならない。By diluting the segregation concentration such as 0), the effect of grain boundary strengthening can be obtained. In order to ensure these effects, the amount of Nb needs to be at least 0.5%. The effect increases as the amount increases. Preferably, it is 0.7% or more. However, if it exceeds 1.5%, the susceptibility to weld cracking will increase, so it should not exceed 1.5%.
０ ： ０．０１％以下
０は、結晶粒界に低融点酸化物を形成し、溶接割れ感受
性を高めるので、０．０１％を上限とする。0: 0.01% or less Since 0 forms low melting point oxides at grain boundaries and increases weld cracking susceptibility, the upper limit is set to 0.01%.
Ｎ ： ０．０４％以下
Ｎは、粒界に偏析して溶接割れ感受性を高める原因とな
るので、０．０４％を上限とする。より好ましくは、０
．０２％以下である。N: 0.04% or less Since N segregates at grain boundaries and causes increased weld cracking susceptibility, the upper limit is set at 0.04%. More preferably, 0
．． 0.02% or less.
〔実施例〕
高周波誘導溶解炉で溶製した耐食鋳鋼溶湯を、遠心力鋳
造に付し、中空鋳物（外径３００ｎｘ肉厚５０關×長さ
１２００ｍ）を得た。各供試鋳物の化学成分組成を第１
表に示す。各鋳物から溶接試験片（外径２９０顛メ肉厚
３５ｍＸ長さ２００朋）を採取し、Ｕ開先に仕上げ、突
き合わせ溶接を行った。初層、２層ビードは「インコネ
ル６２５」を用いてタングステン不活性ガスアーク溶接
（ＴＩＧ溶接）により形成し、第３層以降のビードは「
インコネル１１２」を用いてアーク溶接により形成した
。第１図は溶接試験片の開先形状と突き合わせ溶接状況
を示している。（１）、（１）は溶接試験片であり、初
層ビード（２）、第２層ビード（３）、および最終層ビ
ード（４）を−点鎖線で示した。溶接条件は通常の高Ｎ
ｉ −高Ｃｒステンレス鋼に使用される条件を用いた。[Example] Molten corrosion-resistant cast steel melted in a high-frequency induction melting furnace was subjected to centrifugal force casting to obtain a hollow casting (outer diameter 300nx wall thickness 50mx length 1200m). The chemical composition of each test casting was determined first.
Shown in the table. A welding test piece (outer diameter 290mm, wall thickness 35m x length 200mm) was taken from each casting, finished into a U groove, and butt welded. The first layer and second layer beads are formed by tungsten inert gas arc welding (TIG welding) using "Inconel 625", and the beads from the third layer onwards are formed using "Inconel 625".
It was formed by arc welding using Inconel 112. Figure 1 shows the groove shape of the welding test piece and the butt welding situation. (1), (1) are welding test pieces, and the first layer bead (2), the second layer bead (3), and the final layer bead (4) are shown by dashed-dot lines. Welding conditions are normal high N
i - Conditions used for high Cr stainless steel were used.
溶接後、各試験片の溶接部分についてカラーチエツクを
行い溶接割れ発生の有無を検査した。また溶接部軸方向
の切断面を検鏡しミクロクラックの有無を検査した。こ
れらの結果を第２表に示す。After welding, a color check was performed on the welded portion of each test piece to determine the presence or absence of weld cracking. In addition, the axial cut surface of the weld was examined using a microscope to check for the presence of microcracks. These results are shown in Table 2.
賦香（ｔｉｌｌ） １〜７は発明例、患１０１〜１０７
は比較例である。比較例１１ｈ １０１〜１０７のうち
、患１０１〜１０６は、いずれかの成分量（表中、下線
付）が本発明の規定からはずれている例、Ｎ１１１０７
は「インコロイ８２５鋳造材」の例である。Till 1 to 7 are invention examples, patients 101 to 107
is a comparative example. Comparative Example 11h Among 101 to 107, cases 101 to 106 are examples in which the amount of any component (underlined in the table) deviates from the provisions of the present invention, N11107
is an example of "Incoloy 825 cast material".
この溶接試験結果から明らかなように、ＣおよびＮｂ量
が不足する場合（１１ｈＩＯＩ）はもちろん、そのいず
れか一方の含有量が不足している場合（阻１０２〜１０
５）には溶接割れが発生しており、またそれらの成分量
が本発明の規定を満足していても、０、Ｎ量が本発明の
規定からはずれた場合（患１０６）にも、溶接割れを回
避できないことがわかる。As is clear from the results of this welding test, not only when the content of C and Nb is insufficient (11hIOI), but also when the content of either one of them is insufficient (102 to 10
5), welding cracks have occurred, and even if the content of these components satisfies the provisions of the present invention, even if the amount of 0 and N deviates from the provisions of the present invention (case 106), welding It can be seen that cracking cannot be avoided.
また、「インコロイ８２５鋳造材」も上記比較例と同じ
ように溶接割れが発生している。これに対し、発明例（
磁１〜７）は、いずれも溶接割れは全く認められず、す
ぐれた溶接性を有していることがわかる。In addition, weld cracking occurred in the "Incoloy 825 cast material" as well as in the above comparative example. In contrast, the invention example (
Magnetics 1 to 7) showed no weld cracks at all, indicating that they had excellent weldability.
本発明の耐食鋳鋼は、溶接割れ抵抗性にすぐれており、
また硫化水素、炭酸ガス、塩素イオン等を含む腐食環境
に対する高度の耐食性を備えている。従って、本発明の
耐食鋳鋼からなる鋳造材は、溶接性と耐食性とが要求さ
れる配管ライン材料として有用であり、特に石油・天然
ガスの採掘・輸送用配管ラインを構成するマニホールド
管、その他の配管材料として高い信頬性を有するもので
ある。The corrosion-resistant cast steel of the present invention has excellent weld cracking resistance,
It also has a high degree of corrosion resistance against corrosive environments containing hydrogen sulfide, carbon dioxide, chlorine ions, etc. Therefore, the cast material made of corrosion-resistant cast steel of the present invention is useful as a piping line material that requires weldability and corrosion resistance, and is particularly useful for manifold pipes constituting piping lines for oil and natural gas extraction and transportation, and other materials. It has high reliability as a piping material.
第１図は、溶接試験片の開先形状および７層溶接のビー
ドの状況図である。
１：溶接試験片、２：初層ビード、３：第２層ビード、
４ ：最４冬層ビード。FIG. 1 is a diagram showing the groove shape of a welding test piece and the bead of seven-layer welding. 1: Welding test piece, 2: First layer bead, 3: Second layer bead,
4: Up to 4 winter layer beads.
Claims (1)
％、Ｍｎ：０．３〜１．５％、Ｐ：０．０２％以下、Ｓ
：０．０２％以下、Ｎｉ：３５〜５０％、Ｃｒ：１８〜
２５％、Ｍｏ：２〜４％、Ｃｕ：１〜３％、Ｎｂ：０．
５〜１．５％、Ｏ：０．０１％以下、Ｎ：０．０４％以
下、残部実質的にＦｅからなる溶接性にすぐれたオース
テナイト系耐食鋳鋼。(1) C: 0.03-0.1%, Si: 0.5-1.5
%, Mn: 0.3 to 1.5%, P: 0.02% or less, S
: 0.02% or less, Ni: 35-50%, Cr: 18-
25%, Mo: 2-4%, Cu: 1-3%, Nb: 0.
Austenitic corrosion-resistant cast steel with excellent weldability, consisting of 5 to 1.5%, O: 0.01% or less, N: 0.04% or less, and the remainder substantially Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25692087A JPH01100247A (en) | 1987-10-12 | 1987-10-12 | Austenitic corrosion-resisting cast steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25692087A JPH01100247A (en) | 1987-10-12 | 1987-10-12 | Austenitic corrosion-resisting cast steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01100247A true JPH01100247A (en) | 1989-04-18 |
Family
ID=17299214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25692087A Pending JPH01100247A (en) | 1987-10-12 | 1987-10-12 | Austenitic corrosion-resisting cast steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01100247A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04154935A (en) * | 1990-10-12 | 1992-05-27 | Kubota Corp | High nickel-chromium iron-base ally for casting |
| JP2011501698A (en) * | 2007-09-18 | 2011-01-13 | エクソンモービル リサーチ アンド エンジニアリング カンパニー | Weld metal compositions for joining steel structures in the oil and gas industry |
| US8467498B2 (en) | 2006-02-20 | 2013-06-18 | Kabushiki Kaisha Toshiba | Image diagnostic apparatus, image processing apparatus, and program |
| US8778260B2 (en) | 2006-08-08 | 2014-07-15 | Nippon Steel & Sumikin Stainless Steel Corporation | Duplex stainless steel |
| US9862168B2 (en) | 2011-01-27 | 2018-01-09 | Nippon Steel & Sumikin Stainless Steel Corporation | Alloying element-saving hot rolled duplex stainless steel material, clad steel plate having duplex stainless steel as cladding material therefor, and production method for same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58100661A (en) * | 1981-12-11 | 1983-06-15 | Nippon Steel Corp | High ni alloy with superior weldability and corrosion resistance |
| JPS6199660A (en) * | 1984-10-22 | 1986-05-17 | Sumitomo Metal Ind Ltd | High strength welded steel pipe for line pipe |
-
1987
- 1987-10-12 JP JP25692087A patent/JPH01100247A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58100661A (en) * | 1981-12-11 | 1983-06-15 | Nippon Steel Corp | High ni alloy with superior weldability and corrosion resistance |
| JPS6199660A (en) * | 1984-10-22 | 1986-05-17 | Sumitomo Metal Ind Ltd | High strength welded steel pipe for line pipe |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04154935A (en) * | 1990-10-12 | 1992-05-27 | Kubota Corp | High nickel-chromium iron-base ally for casting |
| US8467498B2 (en) | 2006-02-20 | 2013-06-18 | Kabushiki Kaisha Toshiba | Image diagnostic apparatus, image processing apparatus, and program |
| US8778260B2 (en) | 2006-08-08 | 2014-07-15 | Nippon Steel & Sumikin Stainless Steel Corporation | Duplex stainless steel |
| JP2011501698A (en) * | 2007-09-18 | 2011-01-13 | エクソンモービル リサーチ アンド エンジニアリング カンパニー | Weld metal compositions for joining steel structures in the oil and gas industry |
| US9862168B2 (en) | 2011-01-27 | 2018-01-09 | Nippon Steel & Sumikin Stainless Steel Corporation | Alloying element-saving hot rolled duplex stainless steel material, clad steel plate having duplex stainless steel as cladding material therefor, and production method for same |
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