JPS5912737B2 - Duplex stainless steel for oil country tubular goods with excellent corrosion resistance - Google Patents

Duplex stainless steel for oil country tubular goods with excellent corrosion resistance

Info

Publication number
JPS5912737B2
JPS5912737B2 JP56018373A JP1837381A JPS5912737B2 JP S5912737 B2 JPS5912737 B2 JP S5912737B2 JP 56018373 A JP56018373 A JP 56018373A JP 1837381 A JP1837381 A JP 1837381A JP S5912737 B2 JPS5912737 B2 JP S5912737B2
Authority
JP
Japan
Prior art keywords
less
stainless steel
country tubular
tubular goods
oil country
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.)
Expired
Application number
JP56018373A
Other languages
Japanese (ja)
Other versions
JPS57131347A (en
Inventor
赳夫 工藤
大司 諸石
昭夫 池田
史朗 向井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP56018373A priority Critical patent/JPS5912737B2/en
Publication of JPS57131347A publication Critical patent/JPS57131347A/en
Publication of JPS5912737B2 publication Critical patent/JPS5912737B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Heat Treatment Of Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Description

【発明の詳細な説明】 この発明は、耐食性、なかんずく耐応力腐食割れ性に優
れた油井管用二相ステンレス鋼に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a duplex stainless steel for oil country tubular goods that has excellent corrosion resistance, particularly stress corrosion cracking resistance.

近年、油井・天然ガス井は深井戸化の傾向が著しく、産
出ガス中に湿潤な硫化水素や塩素イオン等、腐食性物質
が多量含有される事例が多くなってきた。このような傾
向とともに油井管の使用条件が苛酷化すると、油井管の
防食は安定操業上よりー層重要な意味をもつこととなる
。油井管の腐食対策とし又は、インヒビターと呼ばれる
腐食抑制剤を使用して管表面に被膜を生成させ腐食を防
止するなど2|3の例が挙げられるが、何れも上記のよ
うな苛酷な使用条件では今一つ満足のゆく効果が期待で
きない。こうした事情から最近では、油井管により高級
な耐食性材料が用いられる傾向があり、各種ステンレス
鋼をはじめ、インコロイやバスアロイといった高合金鋼
の採用も検討されはじめ℃いる。しかしながらいまのと
ころ、HS−CO2−Cl一の油井環境における腐食挙
動についての詳細なことは十分に解明されておらず、こ
のような環境下での腐食と鋼成分の関連性についても、
僅かに現存する高合金鋼の適性テストなどがなされてい
る程度に過ぎない。
In recent years, there has been a marked trend toward deeper oil and natural gas wells, and there have been many cases where the produced gas contains large amounts of corrosive substances such as wet hydrogen sulfide and chlorine ions. As the usage conditions for oil country tubular goods become more severe along with this trend, corrosion protection of oil country tubular goods becomes even more important for stable operation. Examples of 2 to 3 include measures against corrosion of oil country tubular goods and the use of corrosion inhibitors called inhibitors to prevent corrosion by forming a film on the pipe surface, but all of these methods are used under the harsh operating conditions mentioned above. However, we cannot expect a satisfactory effect. Due to these circumstances, there has been a recent trend toward using high-grade corrosion-resistant materials for oil country tubular goods, and consideration has begun to be given to the use of various types of stainless steel, as well as high-alloy steels such as Incoloy and Bass Alloy. However, to date, the details of the corrosion behavior in the HS-CO2-Cl oil well environment have not been fully elucidated, and the relationship between corrosion and steel composition in such an environment has not been fully elucidated.
Only a few existing high-alloy steels have been tested for suitability.

本発明は、このきわめて腐食性のつよい、H2S−CO
2−CI一の油井環境下でも優れた耐久性を発揮する油
井管用鋼の提供を目的とするものである。
The present invention is directed to this highly corrosive, H2S-CO
The object of the present invention is to provide steel for oil country tubular goods that exhibits excellent durability even under the oil well environment of 2-CI.

すなわち本発明の要旨とするところは、C: イ☆0.
1%以下、Sil.O%以下、Mn2.O%以下、PO
.O3%以下、80.005%以下、NO.3%以下で
、MO4.O%以下を含み、Ni.Crを、下記式及び
式を満たす範囲で含有し、24%≦Cr(%)−1−
MO(%)≦29% ・・・更に場合によってはC
ul%以下を含み、残部は実質的にFeよりなることを
特徴とする耐食性に優れた油井管用二相ステンレス鋼に
ある。
That is, the gist of the present invention is that C: A☆0.
1% or less, Sil. 0% or less, Mn2. 0% or less, PO
.. O3% or less, 80.005% or less, NO. 3% or less, MO4. Contains 0% or less, Ni. Contains Cr within a range that satisfies the following formula and formula, 24%≦Cr(%)-1-
MO (%)≦29% ...and in some cases C
The duplex stainless steel for oil country tubular goods has excellent corrosion resistance and is characterized by containing ul% or less and the remainder being substantially Fe.

本発明者らの実験、研究によれば、H2S−CO2−C
z−環境下における腐食の主たるものは応力腐食割れで
あり、更にこの場合の応力腐食割れは、一般の場合のス
テンレス鋼のそれとは腐食挙動を全く異にするものであ
り、一般の応力腐食割れがCI−の存在と深く係わるも
のであるのに対し、上記油井環境によるものではCl一
もさることながら、それ以上にH2Sの影響が太きいと
いうことが明らかとなった。
According to the experiments and research of the present inventors, H2S-CO2-C
The main type of corrosion in the Z-environment is stress corrosion cracking, and the corrosion behavior of stress corrosion cracking in this case is completely different from that of general stainless steel, and is different from general stress corrosion cracking. is closely related to the presence of CI-, whereas in the oil well environment, it has become clear that the influence of H2S is greater than that of Cl-.

一方、油井管として実用に供される鋼管は一般に、油井
管として必要な強度を得るため,使用に先立ち冷間加工
が行われるが、冷間加工は応力腐食割れ性に対する悪影
競が著しいということもまた、本発明者らの研究の結果
判明した。二相ステ/レス鋼もその例外ではなく、一般
にH2S−CO2−CA一環境下での応力腐食割れに対
し可成り高い抵抗性を示すものではあるが、この鋼も油
井管としては、固溶化熱処理のままでは強度不足のため
冷間力旺が必須とされ、この冷間加工が施されると、と
くに圧延方向と直角(T方向)に引張応力が作用する場
合、応力腐食割れ抵抗性が低下する傾向がつよい。本発
明者らは、冷間加工後も二相ステンレス鋼本来のH2S
−CO2−CI−環境に対する耐応力腐食割れ性が維持
される鋼組成について系統的に実験、研究を推進し、そ
の結果、冷間加工を加えてもT方向の応力腐食割れ抵抗
性の劣化が小さい二相ステンレス鋼の開発に至ったもの
である。第1図は、上記油井環境下での耐応力腐食割れ
抵抗性とCr(%)+ MO(%)(以下、Xで示す)
、Ni(支))−+−30{C(%)十NφB(以下、
yで示す)との関係を示す。これは一試験結果を表わし
たものであるが、その試験とは、Cr,Ni,MO*C
.Nの各含有量を種々に変えたCr−Ni−MO鋼を溶
製し、鍛伸そし″C7mJX厚まで熱延を行なった後、
1050゜Cで30分保持後水冷する固溶化処理を行な
い、しかる後30%の冷間刀旺で強度を高め、この板か
らT方向に2T1j/t厚×107LIn巾×75闘長
の試験片をとり、応力腐食割れ試験を実施したものであ
る。応力腐食割れ試験としては、第2図に示す3点ビー
ム冶具によって試験片に0.2%耐力の70%に相当す
る引張応力を付加し、室温に″″C1気圧H2S,lO
気圧CO2でH2S,CO2をそれぞれ飽和させた20
%NaCl溶液(温度=200゜C)中に1000h浸
漬し、応力腐食割れ発生の有無を調べる方法によった。
図中、〇二割れなし、×:割れ発生、をそれぞれ示す。
同図より明らかなことは、Xの値が24%以上でかつX
とyの値がx−y二10%とx − y=16%(それ
ぞれ直線A.Bで示される)の間では、冷間加工後も良
好な耐応力腐食割れ性が維持されるということである。
On the other hand, steel pipes used for practical use as oil country tubular goods are generally cold-worked prior to use in order to obtain the strength required for oil country tubular goods, but it is said that cold working has a significant negative effect on stress corrosion cracking. This was also found as a result of research by the present inventors. Duplex stainless/stainless steel is no exception, and generally shows fairly high resistance to stress corrosion cracking in an H2S-CO2-CA environment, but this steel is also used as oil country tubular goods due to solid solution treatment. Cold working is essential because the strength is insufficient if heat treated, and when this cold working is applied, stress corrosion cracking resistance is improved, especially when tensile stress is applied perpendicular to the rolling direction (T direction). There is a strong tendency to decline. The present inventors have discovered that the inherent H2S of duplex stainless steel even after cold working.
-CO2-CI- We are conducting systematic experiments and research on steel compositions that maintain stress corrosion cracking resistance in the environment, and as a result, we have found that stress corrosion cracking resistance in the T direction does not deteriorate even after cold working. This led to the development of a small duplex stainless steel. Figure 1 shows stress corrosion cracking resistance and Cr (%) + MO (%) (hereinafter indicated by X) under the above oil well environment.
, Ni (support)) −+−30 {C (%) ten NφB (hereinafter,
(denoted by y). This shows the results of one test, but that test was for Cr, Ni, MO*C.
.. After melting Cr-Ni-MO steel with various N contents, forging and hot rolling to a thickness of C7mJX,
After holding at 1050°C for 30 minutes and cooling with water, the plate was subjected to solid solution treatment, and then the strength was increased with 30% cold treatment, and a test piece of 2T1j/t thickness x 107LIn width x 75 lengths was made from this board in the T direction. A stress corrosion cracking test was conducted. For the stress corrosion cracking test, a tensile stress equivalent to 70% of the 0.2% proof stress was applied to the test piece using the three-point beam jig shown in Figure 2, and the test piece was heated to room temperature with ``'' C1 atm H2S, lO
20 saturated H2S and CO2 with atmospheric CO2
% NaCl solution (temperature = 200°C) for 1000 hours, and the presence or absence of stress corrosion cracking was examined.
In the figure, ○2 indicates no cracking, and × indicates cracking occurred.
What is clear from the figure is that the value of X is 24% or more and
Good stress corrosion cracking resistance is maintained even after cold working when the values of It is.

云う迄もな(x−yとは、前出式の中位の式に相尚する
。本発明鋼における各成分限定の理由&’l下のとおり
である。
Needless to say, (x-y is equivalent to the intermediate equation in the above equation.The reasons for limiting each component in the steel of the present invention are as follows.

C:強度向上およびオーステナイト相安定性の向上に寄
与する元素であってNi使用量の節約を図る上で有効で
あるが、0,1%を越えると固溶化処理後の冷却中に腐
食の起点となるクロム炭化物の生成がみられ、耐食性の
劣化を来たす。
C: An element that contributes to improving strength and austenite phase stability, and is effective in reducing the amount of Ni used, but if it exceeds 0.1%, it becomes a starting point for corrosion during cooling after solution treatment. Formation of chromium carbide is observed, resulting in deterioration of corrosion resistance.

N:C同様の効果があるが、0.3%を越えると耐食性
への悪影響が出る。
N: Has the same effect as C, but if it exceeds 0.3%, it will have an adverse effect on corrosion resistance.

CrおよびMO二両者とも耐応力腐食割れ性を高めるの
に有効な元素であり、特にMOは少量でも効果が太きい
Both Cr and MO2 are effective elements for increasing stress corrosion cracking resistance, and MO in particular has a great effect even in small amounts.

しかしながら、Cr(%)+MO(%ν29%を越える
と、またCr(%)+ MO(%)が29%以下でもM
Oが4飴を上廻ると、固溶化処理後の冷却中にσ相が析
出し易くなり靭性が損われる危蔭性があるので、Crt
%)+ MO(%)≦29%、MO≦4%としなげれば
ならない。Cu:特に酸性環境下での耐食性を上げる効
果があるから、1%までの添加は場合によっては有利で
ある。
However, M
If O exceeds 4%, the σ phase tends to precipitate during cooling after solution treatment, and there is a risk of loss of toughness.
%) + MO (%)≦29%, MO≦4%. Cu: Addition of up to 1% is advantageous in some cases since it has the effect of increasing corrosion resistance, especially in an acidic environment.

1%を越えると、熱間加工性が劣化する。If it exceeds 1%, hot workability deteriorates.

この他の鋼成分については、Si:脱酸剤として必要で
あるが1.0%を越えると熱間加工性が劣化する。
Regarding other steel components, Si: necessary as a deoxidizing agent, but if it exceeds 1.0%, hot workability deteriorates.

Mn:脱酸剤として必要であり、応力腐食割れには影響
しないので2.0%まで許容した。
Mn: Necessary as a deoxidizer and does not affect stress corrosion cracking, so Mn was allowed up to 2.0%.

P :応力腐食割れ性に有害であるので0.0a%以下
とする。
P: Since it is harmful to stress corrosion cracking properties, the content should be 0.0a% or less.

S :Sは熱間加工性を著しく劣化させるので0.00
5%以下とする。
S: 0.00 as S significantly deteriorates hot workability.
5% or less.

次に本発明の効果を実施例に基いて説明する。Next, the effects of the present invention will be explained based on examples.

第1表に示す(1}−(17)の各成分の鋼を溶製し、
外径607njI1、肉厚4uの鋼管を通常の製管法に
て製作し、これに20%の冷間力旺を加えて強度を高め
油井管とした。この油井管から、中心角で60油に当た
る部分を切欠した長さ20,の管状体を試験片として採
取し、第3図に示すようにセツトしてボルト・ナットに
て管外表面で0.2%耐力の70%に相当する引張応力
なT方向、すなわち応力腐食割れの生じ易い方向に付加
し、1気圧H2S、10気圧CO2で飽和させた20%
NaCit溶液(温度二200゜C)に1000h浸漬
し応力腐食割れ発生の有無を調査した。結果は第1表に
示し“た。應(n)はSUS329Jlに相当する二相
ステンレス鋼であるが、これをはじめ、鋼成分の何れか
が本発明範囲から外れる比較例(11H47)は、全て
H2S−CO?−CllJj境下で応力腐食割れの発生
がみられたのに対し(1)〜斡沖本発明例では、応力腐
食割れは一切認められず、本発明鋼の有用性が実証され
た。
Steel having each component (1}-(17) shown in Table 1 is melted,
A steel pipe with an outer diameter of 607njI1 and a wall thickness of 4u was manufactured using a normal pipe manufacturing method, and 20% cold stress was added to the pipe to increase its strength, thereby making it into an oil country tubular product. From this oil country pipe, a 20 mm long tubular body with a central angle corresponding to 60 mm of oil cut out was taken as a test piece, set as shown in Fig. 3, and bolted and nutted to 0.0 mm on the outer surface of the tube. A tensile stress equivalent to 70% of the 2% proof stress is applied in the T direction, that is, a direction where stress corrosion cracking is likely to occur, and 20% is saturated with 1 atm H2S and 10 atm CO2.
The specimens were immersed in NaCit solution (temperature: 2200°C) for 1000 hours, and the presence or absence of stress corrosion cracking was investigated. The results are shown in Table 1. 應(n) is a duplex stainless steel equivalent to SUS329Jl, but this and other comparative examples (11H47) in which any of the steel components are outside the scope of the present invention are all In contrast to the occurrence of stress corrosion cracking under the H2S-CO?-CllJj condition, no stress corrosion cracking was observed in the inventive examples of (1) to Oki, demonstrating the usefulness of the inventive steel. .

以上の説明から明らかな如く本発明二相ステンレス鋼は
、冷間加工後もH2S−CO2−CI−環境下での応力
腐食割れに対する高い抵抗性が維持される特徴を有して
いるから、冷間加工して使用される油井管に用いて優れ
た耐久性を発揮するものである。
As is clear from the above description, the duplex stainless steel of the present invention maintains high resistance to stress corrosion cracking in an H2S-CO2-CI environment even after cold working. It exhibits excellent durability when used in oil country tubular goods that are used after partial processing.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は鋼中Cr(イ)+MO一よびNi(イ)十30
{C(イ)十N(%)}が耐応力腐食割れ性に及ぼす影
響を示す図、第2図は板状試験片用応力腐食割れ試験機
を示す図、第3図は管状試験片を示す図である。
Figure 1 shows Cr (a) + MO1 and Ni (a) 130 in steel.
Figure 2 shows the influence of {C(A) 10N (%)} on stress corrosion cracking resistance. Figure 2 shows the stress corrosion cracking tester for plate specimens. Figure 3 shows the stress corrosion cracking tester for tubular specimens. FIG.

Claims (1)

【特許請求の範囲】 1 C0.1%以下、Si1.0%以下、Mn2.0%
以下、P0.03%以下、S0.005%以下、N0.
3%以下で、Mo4.0%以下に、Ni、Crを、下式
(1)、(2)を満す範囲内で含有し、24%≦Cr(
%)+Mo(%)≦29%・・・(1)10%≦Cr(
%)+Mo(%)−Ni(%)−30{C(%)+N(
%)}≦16%・・・(2)残部は実質的にFeよりな
ることを特徴とする耐食性に優れた油井管用二相ステン
レス鋼。 2 C0.1%以下、Si1.0%以下、Mn2.0%
以下、P0.03%以下、S0.005%以下、N0.
3%以下で、Mo4.0%以下に、Ni、Crを、下式
(1)、(2)を満たす範囲内で含有し、24%≦Cr
(%)+Mo(%)≦29%・・・(1)10%≦Cr
(%)+Mo(%)−Ni(%)−30{C(%)+N
(%)}≦16%・・・(2)更にCu1%以下を含み
、残部は実質的にFeよりなることを特徴とする耐食性
に優れた油井管用二相ステンレン鋼。
[Claims] 1 C 0.1% or less, Si 1.0% or less, Mn 2.0%
Below, P0.03% or less, S0.005% or less, N0.
3% or less, Mo4.0% or less, Ni and Cr within a range that satisfies the following formulas (1) and (2), and 24%≦Cr(
%)+Mo(%)≦29%...(1)10%≦Cr(
%)+Mo(%)-Ni(%)-30{C(%)+N(
%)}≦16%...(2) A duplex stainless steel for oil country tubular goods having excellent corrosion resistance, characterized in that the remainder is substantially made of Fe. 2 C0.1% or less, Si1.0% or less, Mn2.0%
Below, P0.03% or less, S0.005% or less, N0.
3% or less, Mo4.0% or less, Ni and Cr within a range that satisfies the following formulas (1) and (2), and 24%≦Cr
(%)+Mo(%)≦29%...(1)10%≦Cr
(%) + Mo (%) - Ni (%) - 30 {C (%) + N
(%)}≦16% (2) A duplex stainless steel for oil country tubular goods having excellent corrosion resistance, which further contains 1% or less of Cu, and the remainder is substantially composed of Fe.
JP56018373A 1981-02-09 1981-02-09 Duplex stainless steel for oil country tubular goods with excellent corrosion resistance Expired JPS5912737B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56018373A JPS5912737B2 (en) 1981-02-09 1981-02-09 Duplex stainless steel for oil country tubular goods with excellent corrosion resistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56018373A JPS5912737B2 (en) 1981-02-09 1981-02-09 Duplex stainless steel for oil country tubular goods with excellent corrosion resistance

Publications (2)

Publication Number Publication Date
JPS57131347A JPS57131347A (en) 1982-08-14
JPS5912737B2 true JPS5912737B2 (en) 1984-03-26

Family

ID=11969900

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56018373A Expired JPS5912737B2 (en) 1981-02-09 1981-02-09 Duplex stainless steel for oil country tubular goods with excellent corrosion resistance

Country Status (1)

Country Link
JP (1) JPS5912737B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59143050A (en) * 1983-02-03 1984-08-16 Kubota Ltd Two-phase stainless cast steel with high corrosion resistance and toughness
JPH03146641A (en) * 1989-11-01 1991-06-21 Taiheiyo Tokushu Chuzo Kk Duplex stainless cast steel for manufacturing apparatus for wet type phosphoric acid
CA2638289C (en) * 2007-03-26 2011-08-30 Sumitomo Metal Industries, Ltd. Oil country tubular good for expansion in well and duplex stainless steel used for oil country tubular good for expansion
JP5717479B2 (en) * 2011-03-14 2015-05-13 新日鐵住金ステンレス株式会社 High-strength, high-corrosion-resistant stainless steel bolts excellent in stress-corrosion-resistant cracks and methods for producing the same
CN105886956B (en) * 2016-07-01 2017-10-31 东北大学 A kind of economizing type two-phase stainless steel sheet and preparation method thereof
CN111926257A (en) * 2020-08-13 2020-11-13 长兴云腾新能源科技有限公司 Corrosion-resistant stainless steel pipe and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4911127A (en) * 1972-05-29 1974-01-31
JPS505972A (en) * 1973-05-21 1975-01-22
JPS52143913A (en) * 1976-05-25 1977-11-30 Nippon Steel Corp Two phases stainless steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4911127A (en) * 1972-05-29 1974-01-31
JPS505972A (en) * 1973-05-21 1975-01-22
JPS52143913A (en) * 1976-05-25 1977-11-30 Nippon Steel Corp Two phases stainless steel

Also Published As

Publication number Publication date
JPS57131347A (en) 1982-08-14

Similar Documents

Publication Publication Date Title
JP4428237B2 (en) High strength martensitic stainless steel with excellent carbon dioxide corrosion resistance and sulfide stress corrosion cracking resistance
US4119765A (en) Welded ferritic stainless steel articles
BR112019001287B1 (en) HIGH STRENGTH SEAMLESS STAINLESS STEEL PIPE FOR TUBULAR GOODS FOR THE OIL INDUSTRY AND METHOD FOR PRODUCTION THE SAME
WO1996018751A1 (en) Duplex stainless steel excellent in corrosion resistance
BR112019002999B1 (en) DOUBLE PHASE SEAMLESS STAINLESS STEEL TUBE AND METHOD FOR PRODUCTION THEREOF
JPWO2009119630A1 (en) Ni-based alloy
US4942922A (en) Welded corrosion-resistant ferritic stainless steel tubing having high resistance to hydrogen embrittlement and a cathodically protected heat exchanger containing the same
JP2005023353A (en) Austenitic stainless steel for high temperature water environment
BR112019013808A2 (en) duplex stainless steel and method to produce the same
JP2003525354A (en) Duplex stainless steel
US5985209A (en) Martensitic steel for line pipe having excellent corrosion resistance and weldability
JP2002529599A (en) New uses for stainless steel with seawater applicability
JPS5912737B2 (en) Duplex stainless steel for oil country tubular goods with excellent corrosion resistance
US4585479A (en) Welding material of ferrite-austenite two-phase stainless steel and method of application
JP4312408B2 (en) Corrosion resistant austenitic alloy
JPH0375337A (en) Martensitic stainless steel having high strength and excellent corrosion resistance and its manufacture
JP3156170B2 (en) Martensitic stainless steel for line pipe
JP2620809B2 (en) High-strength martensitic stainless steel excellent in high-temperature high-chloride-ion-concentration wet high-pressure carbon dioxide gas environment corrosion resistance and stress corrosion cracking resistance, and method for producing the same
JPH059503B2 (en)
JP2602319B2 (en) High-strength, high-temperature, high-chloride-ion-concentration, wet carbon dioxide gas-corrosion-resistant, martensitic stainless steel excellent in stress corrosion cracking resistance and method for producing the same
JPS629661B2 (en)
JPS5819741B2 (en) Austenitic stainless steel with excellent stress corrosion cracking resistance and weldability in high-temperature pure water
JPH04224656A (en) Martensitic stainless steel for oil well casting, tubing and drill pipe
JPS59100219A (en) Production of stainless steel pipe for heat exchanger
JPS625975B2 (en)