JP2002327251A - Chromium-containing steel superior in intergranular corrosion resistance and low temperature toughness in weld - Google Patents
Chromium-containing steel superior in intergranular corrosion resistance and low temperature toughness in weldInfo
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- JP2002327251A JP2002327251A JP2001128925A JP2001128925A JP2002327251A JP 2002327251 A JP2002327251 A JP 2002327251A JP 2001128925 A JP2001128925 A JP 2001128925A JP 2001128925 A JP2001128925 A JP 2001128925A JP 2002327251 A JP2002327251 A JP 2002327251A
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- less
- chromium
- corrosion resistance
- intergranular corrosion
- temperature toughness
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、腐食環境の厳しい
用途で使用される場合の、溶接部近傍での耐粒界腐食性
と共に低温靭性を向上させ、構造用鋼等として長期間に
亘って使用できる、溶接部の耐粒界腐食性および低温靭
性に優れたクロム含有鋼に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves the low-temperature toughness as well as the intergranular corrosion resistance in the vicinity of a weld when used in a severely corrosive environment. The present invention relates to a chromium-containing steel which can be used and has excellent intergranular corrosion resistance and low-temperature toughness of a weld.
【０００２】[0002]
【従来の技術】鋼中のクロム含有量が低く、かつニッケ
ル含有量が低いクロム含有鋼は、ＳＵＳ３０４鋼のよう
なオーステナイト系ステンレス鋼と比較して、価格的に
極めて有利であることから、構造用鋼のように大量に使
用される用途に適している。このようなクロム含有鋼
は、その成分組成によってフェライト組織あるいはマル
テンサイト組織を有するが、一般的にフェライト系ある
いはマルテンサイト系ステンレス鋼は、溶接部の低温靭
性あるいは耐食性に劣る。2. Description of the Related Art A chromium-containing steel having a low chromium content and a low nickel content in steel is extremely advantageous in terms of price as compared with an austenitic stainless steel such as SUS304 steel. Suitable for applications that are used in large quantities, such as steel. Such a chromium-containing steel has a ferritic structure or a martensitic structure depending on the composition of the component. Generally, a ferritic or martensitic stainless steel is inferior in low-temperature toughness or corrosion resistance of a welded portion.
【０００３】このような溶接部の特性劣化を防止する手
段として、特公昭５１−１３４６３号公報および特公昭
６１−２３２５９号公報に記載されているような、溶接
部でのマルテンサイト組織の形成を用いて、耐食性およ
び低温靭性の低下を防止する方法が開示されている。As means for preventing such deterioration of the properties of the welded portion, formation of a martensite structure in the welded portion as described in JP-B-51-13463 and JP-B-61-23259 is known. A method for preventing deterioration of corrosion resistance and low-temperature toughness by using the method is disclosed.
【０００４】溶接部でのマルテンサイト変態を用いたク
ロム含有鋼は、実際に海上コンテナーの骨材として使用
されており、今まで溶接部における耐食性あるいは低温
靭性が問題となった例はない。しかしながら、使用環境
が厳しい腐食環境（鋼材の濡れ時間が長い、塩化物濃度
が高い、高温、ｐＨが低い等）で使用された場合には、
溶接部における耐食性が不十分である場合が生じること
が分かってきた。[0004] Chromium-containing steel using martensitic transformation in welds has been actually used as an aggregate for marine containers, and there has been no example of corrosion resistance or low-temperature toughness in welds. However, when used in a severe corrosive environment (long steel wetting time, high chloride concentration, high temperature, low pH, etc.),
It has been found that the corrosion resistance at the weld may be insufficient.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、マルテンサ
イト変態を用いたクロム含有鋼の溶接部での耐食性劣化
を防止し、厳しい腐食環境においても、溶接部の耐粒界
腐食性および低温靭性に優れたクロム含有鋼を提供する
ことをその課題とする。SUMMARY OF THE INVENTION The present invention is intended to prevent the deterioration of corrosion resistance at the weld of a chromium-containing steel using martensitic transformation, and to prevent intergranular corrosion resistance and low-temperature toughness of the weld even in severe corrosive environments. It is an object of the present invention to provide a chromium-containing steel excellent in quality.
【０００６】[0006]
【課題を解決するための手段】発明者らは、上記課題を
解決すべく鋭意検討した結果、溶接部およびその近傍で
の粒界腐食の発生を防止するには、粒界腐食の発生原因
となる炭素および窒素を安定化するＴｉおよび／または
Ｎｂを添加することによって達成することができるが、
一方、Ｔｉおよび／またはＮｂの添加は溶接部靭性を低
下させることを見出した。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, in order to prevent the occurrence of intergranular corrosion at the welded portion and its vicinity, the cause of the intergranular corrosion is described. Can be achieved by adding Ti and / or Nb to stabilize carbon and nitrogen
On the other hand, it has been found that the addition of Ti and / or Nb lowers the weld toughness.
【０００７】そこで、さらに溶接部靭性の低下を防止す
ると共に、粒界腐食の発生を防止すべく検討した結果、
下記（１）式を満足すべく成分設計することによって、
目的を達成しうること、また０．０２質量％を超え０．
０４質量％以下のＰの添加やフェライト平均粒径を微細
化によって、溶接部の耐粒界腐食性および低温靭性をさ
らに向上できることをを見い出した。 １８×Ｃｒ％＋３５×Ｓｉ％＋１５×Ｍｏ％＋１００×Ｔｉ％＋５０× Ｎｂ％−２０×Ｍｎ％−４０×Ｎｉ％−３０×Ｃｕ％−５４０×Ｃ％− ４６０×Ｎ％≦２２０％ …………（１）[0007] Therefore, as a result of further investigation to prevent the decrease in weld toughness and to prevent the occurrence of intergranular corrosion,
By designing the components to satisfy the following equation (1),
It is possible to achieve the object, and more than 0.02% by mass.
It has been found that the addition of P of not more than 04% by mass and the refinement of the average ferrite grain size can further improve the intergranular corrosion resistance and low-temperature toughness of the welded portion. 18 x Cr% + 35 x Si% + 15 x Mo% + 100 x Ti% + 50 x Nb%-20 x Mn%-40 x Ni%-30 x Cu%-540 x C%-460 x N% ≤ 220% ... …… (1)
【０００８】本発明は、かかる知見に基づいて完成され
たものであって、その要旨とするところは以下の通りで
ある。 （１）質量％で、 Ｃ ：０．０３％以下、 Ｎ ：０．０２％以下、 Ｓｉ：１％以下、 Ｍｎ：２％以下、 Ｐ ：０．０２％以下、 Ｓ ：０．０３％以下、 Ｃｒ：７〜１８％、 Ｎｉ：０．２〜３．４％ を含有し、さらに、 Ｔｉ：２×（Ｃ％＋Ｎ％）〜２０×（Ｃ％＋Ｎ％）、 Ｎｂ：４×（Ｃ％＋Ｎ％）〜２０×（Ｃ％＋Ｎ％） の１種または２種を含有し、残部がＦｅおよび不可避不
純物からなり、かつ、各元素の含有量が下記（１）式を
満足することを特徴とする溶接部の耐粒界腐食性および
低温靭性に優れたクロム含有鋼。 １８×Ｃｒ％＋３５×Ｓｉ％＋１５×Ｍｏ％＋１００×Ｔｉ％＋５０× Ｎｂ％−２０×Ｍｎ％−４０×Ｎｉ％−３０×Ｃｕ％−５４０×Ｃ％− ４６０×Ｎ％≦２２０％ …………（１）The present invention has been completed based on such findings, and the gist thereof is as follows. (1) In mass%, C: 0.03% or less, N: 0.02% or less, Si: 1% or less, Mn: 2% or less, P: 0.02% or less, S: 0.03% or less , Cr: 7 to 18%, Ni: 0.2 to 3.4%, Ti: 2 × (C% + N%) to 20 × (C% + N%), Nb: 4 × (C % + N%) to 20 × (C% + N%), the balance being Fe and inevitable impurities, and the content of each element satisfying the following formula (1). Chromium-containing steel with excellent intergranular corrosion resistance and low-temperature toughness of the weld. 18 x Cr% + 35 x Si% + 15 x Mo% + 100 x Ti% + 50 x Nb%-20 x Mn%-40 x Ni%-30 x Cu%-540 x C%-460 x N% ≤ 220% ... …… (1)
【０００９】（２）質量％で、 Ｃ ：０．０３％以下、 Ｎ ：０．０２％以下、 Ｓｉ：１％以下、 Ｍｎ：２％以下、 Ｐ ：０．０２％超０．０４％以下、 Ｓ：０．０３％以下、 Ｃｒ：７〜１８％、 Ｎｉ：０．２〜３．４％ を含有し、さらに、 Ｔｉ：２×（Ｃ％＋Ｎ％）〜２０×（Ｃ％＋Ｎ％）、 Ｎｂ：４×（Ｃ％＋Ｎ％）〜２０×（Ｃ％＋Ｎ％） の１種または２種を含有し、残部がＦｅおよび不可避不
純物からなり、かつ、各元素の含有量が前記（１）式を
満足することを特徴とする溶接部の耐粒界腐食性および
低温靭性に優れたクロム含有鋼。(2) In mass%, C: 0.03% or less, N: 0.02% or less, Si: 1% or less, Mn: 2% or less, P: more than 0.02% and 0.04% or less , S: 0.03% or less, Cr: 7 to 18%, Ni: 0.2 to 3.4%, and Ti: 2 × (C% + N%) to 20 × (C% + N%) ), Nb: contains one or two of 4 × (C% + N%) to 20 × (C% + N%), the balance being Fe and unavoidable impurities, and the content of each element being the above ( 1) A chromium-containing steel excellent in intergranular corrosion resistance and low-temperature toughness of a weld, which satisfies the formula.
【００１０】（３）質量％でさらに、 Ｍｏ：０．１〜５％、 Ｃｕ：０．１〜４％ の１種または２種を含有することを特徴とする前記
（１）または（２）に記載の溶接部の耐粒界腐食性およ
び低温靭性に優れたクロム含有鋼。 （４）質量％でさらに、Ｍｇ：０．０００５〜０．０１
％を含有することを特徴とする前記（１）乃至（３）の
いずれか１項に記載の溶接部の耐粒界腐食性および低温
靭性に優れたクロム含有鋼。 （５）フェライト平均粒径が、ＪＩＳ Ｇ０５２２によ
って定められる粒度番号において６番以上であることを
特徴とする前記（１）乃至（４）のいずれか１項に記載
の溶接部の耐粒界腐食性および低温靭性に優れたクロム
含有鋼。(3) The above (1) or (2), further comprising one or two of Mo: 0.1 to 5% and Cu: 0.1 to 4% by mass%. A chromium-containing steel excellent in intergranular corrosion resistance and low-temperature toughness of a weld described in 1. (4) Mg: 0.0005 to 0.01 in mass%
%. The chromium-containing steel according to any one of the above (1) to (3), which is excellent in intergranular corrosion resistance and low-temperature toughness of the weld. (5) The average grain size of ferrite is 6 or more in a grain size number defined by JIS G0522, wherein the intergranular corrosion resistance of the welded portion according to any one of (1) to (4) above, Chromium-containing steel with excellent heat resistance and low temperature toughness.
【００１１】[0011]
【発明の実施の形態】本発明についてさらに詳細に説明
する。先ず、成分の限定理由を説明する。Ｃは、溶接部
のマルテンサイト組織の靭性を低下すると共に、耐粒界
腐食性の低下原因となるため、その含有量は０．０３％
以下とする。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail. First, the reasons for limiting the components will be described. C reduces the toughness of the martensitic structure of the welded portion and causes a decrease in intergranular corrosion resistance, so its content is 0.03%.
The following is assumed.
【００１２】Ｎは、窒化物として析出し耐粒界腐食性を
劣化させるため、その含有量は０．０２％以下とする。Since N precipitates as nitride and deteriorates intergranular corrosion resistance, its content is made 0.02% or less.
【００１３】Ｓｉは、通常は脱酸材として用いられる元
素であり、また耐酸化性を向上させる目的で積極的に添
加される場合もあるが、その含有量が１％を超えると材
料の製造性を劣化させるため、その含有量は１％以下に
する必要がある。[0013] Si is an element usually used as a deoxidizing material, and may be positively added for the purpose of improving oxidation resistance. In order to deteriorate the property, the content needs to be 1% or less.
【００１４】Ｍｎは、鋼材の耐食性を劣化させる硫化物
系介在物を形成し、材料の耐食性を劣化させるので、そ
の含有量は２％以下にする必要がある。Mn forms sulfide-based inclusions that degrade the corrosion resistance of steel and degrades the corrosion resistance of the material, so its content must be 2% or less.
【００１５】Ｐは、粒界偏析しやすい元素であり、鋼材
の熱間加工性を劣化させるため、０．０２％を超えなよ
うに添加する必要があるが、発明者らは、０．０２％を
超える添加が溶接部の低温靭性の向上に効果があること
を新たに見出した。したがって、さらに優れた溶接部の
低温靭性を得るためには、０．０２％を超え０．０４％
以下の範囲でＰを添加することが好ましい。[0015] P is an element that is liable to segregate at the grain boundary and degrades the hot workability of steel. Therefore, it is necessary to add P in an amount exceeding 0.02%. % Was newly found to be effective in improving the low-temperature toughness of the weld. Therefore, in order to obtain more excellent low-temperature toughness of the welded portion, the content exceeds 0.02% and 0.04%.
It is preferable to add P in the following range.
【００１６】Ｓは、硫化物系介在物を形成し、鋼材の耐
食性を劣化させる元素であり、その含有量の上限は０．
０３％にする必要がある。S is an element that forms sulfide-based inclusions and degrades the corrosion resistance of the steel material.
It needs to be 03%.
【００１７】Ｃｒは、耐食性の向上に不可欠な元素であ
り、その含有量は少なくとも７％以上必要となる。一
方、その含有量が１８％を超えると、溶接部でのマルテ
ンサイト組織を得にくくなることから、７〜１８％の添
加とする。Cr is an element indispensable for improving corrosion resistance, and its content is required to be at least 7% or more. On the other hand, if the content exceeds 18%, it becomes difficult to obtain a martensite structure in the welded portion.
【００１８】Ｎｉは、耐食性の向上および溶接部のマル
テンサイトを形成し、溶接部靭性向上に不可欠な元素で
あり、その含有量は少なくとも０．２％以上必要とな
る。ただし、その含有量が３．４％を超えると溶接部で
のマルテンサイトの生成量が著しく増加するため、０．
２〜３．４％の含有とする。Ni is an element which forms corrosion resistant and forms martensite in a welded part and is indispensable for improving welded toughness. Its content is required to be at least 0.2% or more. However, if the content exceeds 3.4%, the amount of martensite generated in the welded portion increases significantly.
The content is 2 to 3.4%.
【００１９】ＴｉとＮｂは、溶接部での耐粒界腐食性の
防止に不可欠な元素であり、一方もしくは両方を添加す
る。Ｔｉの含有量は、ＣとＮの含有量の和に対して、少
なくとも２倍の含有量が必要となるが、一方で２０倍を
超えて添加しても耐粒界腐食性の改善効果は飽和し、加
工性など他の特性を劣化させる原因になる。したがっ
て、Ｔｉの含有量は２×（Ｃ％＋Ｎ％）〜２０×（Ｃ％
＋Ｎ％）の範囲とする。Ti and Nb are indispensable elements for preventing intergranular corrosion resistance in a welded portion, and one or both of them are added. The content of Ti is required to be at least twice as much as the sum of the contents of C and N. On the other hand, even if added more than 20 times, the effect of improving intergranular corrosion resistance is not improved. Saturation causes deterioration of other characteristics such as workability. Therefore, the content of Ti is 2 × (C% + N%) to 20 × (C%
+ N%).
【００２０】Ｎｂの含有量は、ＣとＮの含有量の和に対
して、少なくとも４倍の含有量が必要となるが、一方で
２０倍を超えて添加しても耐粒界腐食性の改善効果は飽
和し、加工性など他の特性を劣化させる原因になる。し
たがって、Ｔｉの含有量は４×（Ｃ％＋Ｎ％）〜２０×
（Ｃ％＋Ｎ％）の範囲とする。The content of Nb is required to be at least four times the sum of the contents of C and N. The improvement effect is saturated and causes other characteristics such as workability to deteriorate. Therefore, the content of Ti is 4 × (C% + N%) 〜20 ×
(C% + N%).
【００２１】さらに、以上の成分濃度範囲に加えて下記
（１）式を満足するように成分濃度を規定する。かかる
規定によって溶接部の靭性、粒界腐食とも優れたクロム
含有鋼を得ることができる。 １８×Ｃｒ％＋３５×Ｓｉ％＋１５×Ｍｏ％＋１００×Ｔｉ％＋５０× Ｎｂ％−２０×Ｍｎ％−４０×Ｎｉ％−３０×Ｃｕ％−５４０×Ｃ％− ４６０×Ｎ％≦２２０％ …………（１）Further, in addition to the above component concentration range, the component concentration is defined so as to satisfy the following equation (1). By such a rule, a chromium-containing steel excellent in both toughness and intergranular corrosion of a weld can be obtained. 18 x Cr% + 35 x Si% + 15 x Mo% + 100 x Ti% + 50 x Nb%-20 x Mn%-40 x Ni%-30 x Cu%-540 x C%-460 x N% ≤ 220% ... …… (1)
【００２２】以上説明したクロム含有鋼は、溶接部の靭
性および耐粒界腐食性に優れるが、さらにｐＨの低い溶
液中での耐食性を向上させるには、鋼中へのＭｏあるい
はＣｕの添加が有効に働く。Ｍｏ，Ｃｕとも耐食性を向
上させるには、少なくともそれぞれ０．１％以上添加す
る必要があるが、Ｍｏは５％、Ｃｕは４％を超えて添加
すると、耐食性の向上効果が飽和し加工性などを劣化さ
せる原因となることから、Ｍｏは５％、Ｃｕは４％をそ
の上限とする。The chromium-containing steel described above is excellent in the toughness and intergranular corrosion resistance of the weld, but in order to further improve the corrosion resistance in a solution having a low pH, it is necessary to add Mo or Cu to the steel. Work effectively. In order to improve the corrosion resistance of both Mo and Cu, it is necessary to add at least 0.1% or more, respectively. The upper limit of Mo is 5% and that of Cu is 4%, because it causes deterioration of Cu.
【００２３】Ｍｇは、結晶粒径の微細化に伴う低温靭性
の改善に極めて有効であり、少なくとも０．０００５％
以上の添加でその効果がある。一方０．０１％を超えて
添加すると、介在物の粗大化により逆に靭性を低下させ
る。Mg is extremely effective in improving the low-temperature toughness due to the refinement of the crystal grain size.
The above addition has the effect. On the other hand, if it is added in excess of 0.01%, the toughness is reduced due to the coarsening of inclusions.
【００２４】また、フェライトの結晶粒径も微細な方
が、粒界面積を増加させることによる耐粒界腐食性の向
上ならびに低温靭性の向上にも有利であり、従ってフェ
ライト平均粒径は、ＪＩＳ Ｇ０５２２に準拠したフェ
ライト粒度番号で６番以上とすることが好ましい。な
お、このフェライト粒度番号は最終製品におけるものを
指すが、本発明のクロム含有鋼は構造材料として低コス
トであることが求められるため、最終製品は専ら熱延焼
鈍材である。Further, the finer ferrite crystal grain size is also advantageous for improving the intergranular corrosion resistance and the low-temperature toughness by increasing the grain boundary area. It is preferable to set the ferrite grain size number to 6 or more according to G0522. The ferrite grain number refers to that of the final product. However, since the chromium-containing steel of the present invention is required to have low cost as a structural material, the final product is exclusively a hot-rolled annealed material.
【００２５】[0025]
【実施例】表１は、本発明鋼及び比較鋼の鋼中成分にお
いて、板厚は４ｍｍの試験材をＭＩＧ溶接した試験片
の、粒界腐食試験結果およびシャルピー試験結果を示し
たものである。溶接材料は共金系を用い、電圧２０〜３
０Ｖ、電流：１５０〜２５０Ａ、シールドガス：ＣＯ2
の条件で行った。EXAMPLES Table 1 shows the results of intergranular corrosion test and Charpy test of MIG-welded test material having a thickness of 4 mm in the steel components of the present invention steel and comparative steel. . The welding material is a common metal type, and the voltage is 20 to 3
0 V, current: 150 to 250 A, shielding gas: CO 2
Was performed under the following conditions.
【００２６】粒界腐食試験としては、基本的にＪＩＳに
規格された硫酸−硫酸銅試験（Ｇ０５７５）を用いた
が、鋼中のクロム含有量が低い（１２％以下）ものにつ
いては腐食性が厳しすぎるため、硫酸濃度を０．５％ま
で低減した溶液中で試験を行った。硫酸濃度を低減した
以外は、ＪＩＳに準拠して試験を行った。シャルピー試
験については、ＪＩＳに準拠して０℃で試験を行った。
表１に示したように、本発明鋼は優れた溶接部の耐粒界
腐食性および低温靭性を有している。As the intergranular corrosion test, a sulfuric acid-copper sulfate test (G0575) standardized by JIS was basically used, and those having a low chromium content (12% or less) in steel have low corrosiveness. The test was performed in a solution where the sulfuric acid concentration was reduced to 0.5% because it was too severe. The test was performed in accordance with JIS except that the sulfuric acid concentration was reduced. The Charpy test was performed at 0 ° C. in accordance with JIS.
As shown in Table 1, the steel of the present invention has excellent resistance to intergranular corrosion and low-temperature toughness of the welded portion.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【発明の効果】以上示したように、本発明は必要以上に
高価元素を含有することなく、厳しい腐食環境において
も構造用鋼として使用できる、溶接部の耐粒界腐食性お
よび低温靭性に優れたクロム含有鋼を提供でき、産業上
極めて価値の高い発明である。As described above, the present invention has excellent intergranular corrosion resistance and low-temperature toughness of welds without containing unnecessarily expensive elements and can be used as structural steel even in severe corrosive environments. Chromium-containing steel, which is an industrially extremely valuable invention.
Claims (5)
純物からなり、かつ、各元素の含有量が下記（１）式を
満足することを特徴とする溶接部の耐粒界腐食性および
低温靭性に優れたクロム含有鋼。 １８×Ｃｒ％＋３５×Ｓｉ％＋１５×Ｍｏ％＋１００×Ｔｉ％＋５０× Ｎｂ％−２０×Ｍｎ％−４０×Ｎｉ％−３０×Ｃｕ％−５４０×Ｃ％− ４６０×Ｎ％≦２２０％ …………（１）1. Mass%, C: 0.03% or less, N: 0.02% or less, Si: 1% or less, Mn: 2% or less, P: 0.02% or less, S: 0.03 %: Cr: 7 to 18%, Ni: 0.2 to 3.4%, Ti: 2 × (C% + N%) to 20 × (C% + N%), Nb: 4 × One or two of (C% + N%) to 20 × (C% + N%), the balance being Fe and inevitable impurities, and the content of each element satisfies the following formula (1). A chromium-containing steel having excellent intergranular corrosion resistance and low-temperature toughness of a weld. 18 x Cr% + 35 x Si% + 15 x Mo% + 100 x Ti% + 50 x Nb%-20 x Mn%-40 x Ni%-30 x Cu%-540 x C%-460 x N% ≤ 220% ... …… (1)
純物からなり、かつ、各元素の含有量が下記（１）式を
満足することを特徴とする溶接部の耐粒界腐食性および
低温靭性に優れたクロム含有鋼。 １８×Ｃｒ％＋３５×Ｓｉ％＋１５×Ｍｏ％＋１００×Ｔｉ％＋５０× Ｎｂ％−２０×Ｍｎ％−４０×Ｎｉ％−３０×Ｃｕ％−５４０×Ｃ％− ４６０×Ｎ％≦２２０％ …………（１）2. In mass%, C: 0.03% or less, N: 0.02% or less, Si: 1% or less, Mn: 2% or less, P: more than 0.02% and 0.04% or less, S: 0.03% or less, Cr: 7 to 18%, Ni: 0.2 to 3.4%, Ti: 2 × (C% + N%) to 20 × (C% + N%) Nb: contains one or two of 4 × (C% + N%) to 20 × (C% + N%), the balance being Fe and unavoidable impurities, and the content of each element is as follows: ) A chromium-containing steel excellent in intergranular corrosion resistance and low-temperature toughness of a weld, characterized by satisfying the formula: 18 x Cr% + 35 x Si% + 15 x Mo% + 100 x Ti% + 50 x Nb%-20 x Mn%-40 x Ni%-30 x Cu%-540 x C%-460 x N% ≤ 220% ... …… (1)
特徴とする請求項１または２に記載の溶接部の耐粒界腐
食性および低温靭性に優れたクロム含有鋼。3. The welding according to claim 1, further comprising, by mass%, one or two of Mo: 0.1 to 5% and Cu: 0.1 to 4%. Chromium-containing steel with excellent intergranular corrosion resistance and low-temperature toughness.
１項に記載の溶接部の耐粒界腐食性および低温靭性に優
れたクロム含有鋼。4. The intergranular corrosion resistance of a welded part according to claim 1, further comprising Mg: 0.0005 to 0.01% by mass%. Chromium-containing steel with excellent low-temperature toughness.
２２によって定められる粒度番号において６番以上であ
ることを特徴とする請求項１乃至４のいずれか１項に記
載の溶接部の耐粒界腐食性および低温靭性に優れたクロ
ム含有鋼。5. The ferrite particles having an average ferrite particle diameter of JIS G05.
The chromium-containing steel according to any one of claims 1 to 4, wherein the chromium-containing steel has a grain size number of 6 or more in a grain size number defined by No. 22.
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001128925A JP4297631B2 (en) | 2001-04-26 | 2001-04-26 | Chromium-containing steel with excellent intergranular corrosion resistance and low temperature toughness of welds |
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| JP4297631B2 JP4297631B2 (en) | 2009-07-15 |
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Cited By (4)
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|---|---|---|---|---|
| WO2008004684A1 (en) * | 2006-07-04 | 2008-01-10 | Nippon Steel & Sumikin Stainless Steel Corporation | Stainless steel with low chromium content excellent in the corrosion resistance of repeatedly heat-affected zones and process for production thereof |
| JP2009013431A (en) * | 2006-07-04 | 2009-01-22 | Nippon Steel & Sumikin Stainless Steel Corp | Low chromium-containing stainless steel excellent in the corrosion resistance of repeatedly welded heat-affected zone, and producing method thereof |
| WO2011105591A1 (en) * | 2010-02-24 | 2011-09-01 | 新日鐵住金ステンレス株式会社 | Low-chromium-content stainless steel with excellent corrosion resistance of weld |
| JP2016191150A (en) * | 2015-03-30 | 2016-11-10 | 新日鐵住金ステンレス株式会社 | Stainless steel sheet excellent in toughness and production method thereof |
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2001
- 2001-04-26 JP JP2001128925A patent/JP4297631B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008004684A1 (en) * | 2006-07-04 | 2008-01-10 | Nippon Steel & Sumikin Stainless Steel Corporation | Stainless steel with low chromium content excellent in the corrosion resistance of repeatedly heat-affected zones and process for production thereof |
| JP2009013431A (en) * | 2006-07-04 | 2009-01-22 | Nippon Steel & Sumikin Stainless Steel Corp | Low chromium-containing stainless steel excellent in the corrosion resistance of repeatedly welded heat-affected zone, and producing method thereof |
| AU2007270326B2 (en) * | 2006-07-04 | 2010-02-11 | Nippon Steel & Sumikin Stainless Steel Corporation | Stainless steel with low chromium content excellent in the corrosion resistance of repeatedly heat-affected zones and process for production thereof |
| US7883663B2 (en) | 2006-07-04 | 2011-02-08 | Nippon Steel & Sumikin Stainless Steel Corporation | Low chromium stainless steel superior in corrosion resistance of multipass welded heat affected zones and its method of production |
| WO2011105591A1 (en) * | 2010-02-24 | 2011-09-01 | 新日鐵住金ステンレス株式会社 | Low-chromium-content stainless steel with excellent corrosion resistance of weld |
| JP2011174122A (en) * | 2010-02-24 | 2011-09-08 | Nippon Steel & Sumikin Stainless Steel Corp | Low-chromium-containing stainless steel superior in corrosion resistance at welded part |
| US8900380B2 (en) | 2010-02-24 | 2014-12-02 | Nippon Steel & Sumikin Stainless Steel Corporation | Low-chromium stainless steel excellent in corrosion resistance of weld |
| JP2016191150A (en) * | 2015-03-30 | 2016-11-10 | 新日鐵住金ステンレス株式会社 | Stainless steel sheet excellent in toughness and production method thereof |
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