JPS62250156A - Ferritic stainless steel having superior corrosion resistance in crude phosphoric acid - Google Patents
Ferritic stainless steel having superior corrosion resistance in crude phosphoric acidInfo
- Publication number
- JPS62250156A JPS62250156A JP9222386A JP9222386A JPS62250156A JP S62250156 A JPS62250156 A JP S62250156A JP 9222386 A JP9222386 A JP 9222386A JP 9222386 A JP9222386 A JP 9222386A JP S62250156 A JPS62250156 A JP S62250156A
- Authority
- JP
- Japan
- Prior art keywords
- less
- stainless steel
- corrosion resistance
- phosphoric acid
- ferritic stainless
- 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.)
- Granted
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 41
- 230000007797 corrosion Effects 0.000 title claims abstract description 41
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 25
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 abstract description 13
- 239000000203 mixture Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 229910052758 niobium Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- -1 fluoride ions Chemical class 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
- Catalysts (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分骨〕
この発明は、粗製リン酸環境で使用する二相系ステンレ
ス鋼に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] This invention relates to a duplex stainless steel for use in a crude phosphoric acid environment.
リン酸は、通常硫酸を使用しｔこ湿式プロセスにて製造
され、大半の用途は肥料原料といわれる。。Phosphoric acid is usually produced by a wet process using sulfuric acid, and is mostly used as a raw material for fertilizer. .
８式プロセスによると、リン鉱石中の不純物（Ｐ２０５
以外の塩化物、フッ化物、硫酸塩、酸化物等）の多くが
そのままリン酸に混入する。（湿式プロセスによるリン
酸を湿式リン酸と呼び、以下Ｗ Ｉ）Ａと称す。）
即ち、リシ鉱石の品位０組成がその産地によって異なる
結果、ＷＰＡの不純物濃度はおおよそ、Ｈ２３０４’２
．０〜４．５ＸＳＦ −’０．１〜１．ＨｌＦ ｅ ２
０３０．２〜１．５Ｘ、 Ａ Ｉ 、Ｏ、：ｏ、ｚ〜
ｔ、ｓｘｌＭ ｇ Ｏ：ｚ、ｓｙ以下、Ｃａ ＯＯ，５
に以下、ＣＩ −：ｏ、ｏｓｘ以下等の範囲で変動する
。According to the formula 8 process, impurities in phosphate rock (P205
Many of the other chlorides, fluorides, sulfates, oxides, etc.) are mixed into phosphoric acid as is. (Phosphoric acid produced by a wet process is called wet phosphoric acid, hereinafter referred to as WI)A. ) That is, as a result of the grade 0 composition of Rishi ore differing depending on its production area, the impurity concentration of WPA is approximately H2304'2.
．． 0~4.5XSF -'0.1~1. HlF e 2
030.2~1.5X, A I , O, :o, z~
t, sxlM g O: z, sy or less, Ca OO, 5
Below, CI -:o, below osx, etc. will fluctuate within a range.
ＷＰＡを専門に運搬する場合その腐食性のために、従来
ではゴムライニング材をタンクに使用する例が多かった
が、最近ではタンクの汎用性と、メシテナシスフリーを
目的としてスデシしス鋼の１吏用が検討されつつある。Traditionally, rubber lining materials were often used for tanks when transporting WPA specifically due to its corrosivity, but recently Sudesis steel has been used for tank versatility and maintenance-free construction. One-person use is being considered.
然し、最大の問題はステンレス鋼の耐食性である。However, the biggest problem is the corrosion resistance of stainless steel.
ＷＰＡの不純物のうち塩素イオンとフッ素イオンは、ス
テンレス鋼の耐食性を劣化させることが知られており、
０．５にＦ−を含有する条件では０．０３ＸＣ１−以上
になると、３１６タイプのステンレス鋼は激しく腐食す
る。一方、ステンレス鋼のＣ「とＭｏの含有量を増すと
ＷＰＡ中の耐食性は向上することが知られているが、Ｗ
ＰＡで予想されるＦ−、ＣＩ−濃度に対する耐食性に必
要なＣｒ。Among the impurities in WPA, chloride ions and fluoride ions are known to deteriorate the corrosion resistance of stainless steel.
Under conditions containing 0.5% F-, 316 type stainless steel corrodes severely when it exceeds 0.03XC1-. On the other hand, it is known that increasing the content of C and Mo in stainless steel improves the corrosion resistance in WPA.
Cr required for corrosion resistance to expected F-, CI- concentrations in PA.
Ｍｏ量が不明であると共に、一般の耐酸用ステノし、ス
鋼はオー・ステナイト系のｔこめＣｒ 、 Ｍ ｏ 量
の増加と共に高価なＮｉ量を増すことも必要となり、素
材費の高価格化を招来する。In addition to the fact that the amount of Mo is unknown, general acid-resistant stainless steels require an increase in the amount of Cr and Mo, which is austenitic, and an increase in the amount of expensive Ni, resulting in higher material costs. invite.
以上の状況を鑑みると、ＷＰＡ用ステンレス鋼として経
済的で最も厳しい腐食性が予想されるＷＰＡ中で擾れた
耐食性を示し、且つＮｉの使用を省略した安価なステン
レス鋼の開発が望まれているう
〔発明の解決すべき問題点〕
本発明は、湿式リン酸のプロセスに用いる従来の耐食材
における問題点を解決するにあり、３１６タイプのステ
ンレス鋼がｒｆ食するような厳しい条件でも良好な耐食
性を示すステンＬ・ス鋼を提供することを目的とする。In view of the above circumstances, it is desired to develop an inexpensive stainless steel that is economical as a stainless steel for WPA, exhibits poor corrosion resistance in WPA, which is expected to be the most severely corrosive, and omit the use of Ni. [Problems to be solved by the invention] The present invention solves the problems in the conventional corrosion resistance used in the wet phosphoric acid process, and is good even under severe conditions such as RF corrosion of 316 type stainless steel. The purpose of the present invention is to provide stainless steel that exhibits excellent corrosion resistance.
本発明は、次に示す第１〜第２発明からなるものである
。即ち、
第１発明は、
重量基準にて、ｃ；ｏ、ｏｔｘ以下、Ｓ ｉ ； １．
ｏ０％以下、Ｍ ｎ ； １．００％以下、ＰＨ０，０
６ｘ以下、Ｓｉ０．０３Ｘ以下、Ｎｉ； ６．ＯＮ以下
、Ｃｒ ； １９．０〜２８、ｏＸ、 Ｍ ｏ ； Ｌ
ｏ〜（ｉ、ｏＸ、 Ｎ ； ｏ、ｏａＸ以下を含有し、
残部が鉄及び不可避不純物からなり、且つｉ：Ｍｏが１
．０Ｘ以上２．０Ｘ未ｓでは一３ｘＭ ｏ ４４５．０
＜％Ｃｒ≦２８．０ をｉｉ ： Ｍ ｏが２．０〜Ｂ
、 ０％では１９、０＜ ＸＣｒ≦２８．０ を
夫々満足することを特徴とする粗製リン酸中で侵れｒニ
ー ｗＡ食性を有するフェライト系ステンレス鋼であり
、
第２発明は、 前記第１発明の成分に更にＮｂ。The present invention consists of the following first and second inventions. That is, the first invention provides: On a weight basis, c; o, otx or less, S i ; 1.
o0% or less, M n ; 1.00% or less, PH0,0
6x or less, Si0.03x or less, Ni; 6. Below ON, Cr; 19.0-28, oX, Mo; L
Contains o ~ (i, oX, N; o, oaX or less,
The remainder consists of iron and unavoidable impurities, and i:Mo is 1
．． 0X or more and 2.0X or less is -3xMo 445.0
<%Cr≦28.0 ii: Mo is 2.0 to B
, 19 at 0%, and 0<XCr≦28.0, respectively. Furthermore, Nb is added to the ingredients of the invention.
１０ＸＸＣ〜０．８Ｘ、 Ｔ ｉ ； ５ＸＸＣ〜Ｏ，
ａｘの一種または二種を含有する粗製リン酸中で優れｔ
コ耐食性を有するフェライト系ステンレス鋼である。10XXC~0.8X, T i ; 5XXC~O,
Excellent in crude phosphoric acid containing one or two types of ax
It is a ferritic stainless steel with good corrosion resistance.
本発明の、粗製リン酸中で優れた耐食性を有するフェラ
イト系ステンレス鋼中に含有する各成分ノ限定理由につ
いて次に述べる。The reasons for limiting each component contained in the ferritic stainless steel of the present invention, which has excellent corrosion resistance in crude phosphoric acid, will be described below.
Ｃ：ステンレス鋼の粒界腐食（σ受性を高める元素であ
るため、Ｃ含有量をＯ，Ｏｎ以下に限定しな。C: Since it is an element that increases the intergranular corrosion (σ) susceptibility of stainless steel, the C content should not be limited to O, On or less.
ＳＩ：脱酸のために必要な元素で、耐酸性の向上にも有
効な元素であるため、その含有量を１．００２以下に限
定した。SI: An element necessary for deoxidation and effective for improving acid resistance, so its content was limited to 1.002 or less.
Ｍｎ：この元素は鋼中のＳと結合して局部腐食の起点と
なるＭ ｎ Ｓを形成するので少ない方が望ましいが、
１．Ｏｎ以下に含有量を限定すれば実用上の問題はない
。Mn: This element combines with S in steel to form M n S, which becomes the starting point of local corrosion, so it is desirable to have a small amount.
1. There is no practical problem if the content is limited to less than On.
Ｐ：ステンレス鋼の粒界腐食感受性を上げ、また熱間加
工性にも悪影響を及ぼすため、少ない方が望ましい。但
しＯ，ＩＸ以下にすれば、実用上問題を生じないので、
その含有量を０．０６Ｘ以下に限定した。P: P increases the intergranular corrosion susceptibility of stainless steel and also has a negative effect on hot workability, so a smaller amount is preferable. However, if it is below O, IX, there will be no practical problem, so
Its content was limited to 0.06X or less.
Ｓ：熱間加工性と耐局部腐食性を増すためには少ない方
が望ましいので、その含有量を０．０３Ｘ以下に限定し
た。S: In order to increase hot workability and local corrosion resistance, it is desirable to have less S, so the content was limited to 0.03X or less.
ＮＩ： フェライト系ステンレス鋼では、靭性を高める
が、余り多いと塩化物中の耐応力腐食割れ性を損なうの
で、その含有量を６．０ｚ以下に限定した。NI: In ferritic stainless steel, the toughness is improved, but if too much it impairs stress corrosion cracking resistance in chloride, the content is limited to 6.0z or less.
Ｃｒ： ステ、し・ス消の−・般の耐食性を維持ずろ基
本元素であるため、その含有量は多い方が望ましいが、
強腐食性の腐食ＷＰＡ中で所定の耐食性を１！Ｊろため
、その含有量ば１９．Ｈ以上含有する必要があるが、２
８．０を超えると、その効果は飽和するのでＨ済性を考
慮してその含有量を次のように限定した。Cr: Since it is a basic element that maintains corrosion resistance in steel, metal, and metal, it is desirable to have a high content.
The specified corrosion resistance in highly corrosive WPA is 1! J filter, its content is 19. It is necessary to contain H or more, but 2
If it exceeds 8.0, the effect will be saturated, so the content was limited as follows in consideration of H-resistance.
ｉ：Ｍｏが１．０Ｘ以上２．０ｚ未満では一３ＸＭ ｏ
＋２５．０＜％Ｃｒ≦２８．０ をｉｉ：Ｍｏが２．
０〜６．０Ｘ テは
１９．０＜％Ｃｒ≦２８．０ を
夫々満足する含有量が最適である。i: If Mo is 1.0X or more and less than 2.0z, -3XMo o
+25.0<%Cr≦28.0 ii: Mo is 2.
The optimal content of 0 to 6.0X Te satisfies 19.0<%Cr≦28.0.
Ｍｏ：Ｃｒと共に含有させ、その添加量を増すと、一般
の耐食性を顕著に向上する。強腐食性のＷＰＡ中では１
．０％以上の含有でその浸れた添加効果が現れ、６．１
を超えるとその効果は飽和ずろので、経済性を考慮して
、その含有量を１．０〜Ｇ、Ｏｚに限定した。Mo: When Mo is contained together with Cr and the amount added is increased, general corrosion resistance is significantly improved. 1 in highly corrosive WPA
．． The added effect appears when the content is 0% or more, and 6.1
If the content exceeds 1.0 G, the effect will reach saturation, so in consideration of economic efficiency, the content was limited to 1.0 to 1.0 G, Oz.
Ｎ：フエライト系ステンレス鋼では、Ｃｒ窒化物等の析
出に起因した材質、耐食性の劣化を生じろつそのため０
．０３Ｆ；以下に限定した。。N: In ferritic stainless steel, the material quality and corrosion resistance deteriorate due to the precipitation of Cr nitrides, etc. Therefore, 0
．． 03F: Limited to the following. .
以上が第１発明についての添加元素及びその数値限定理
由であるが、第２発明は第１発明添加元素に追加して必
要に応じＴｉ、Ｎｂの−・種または二種を添加すること
が出来る。The above are the additive elements and the reasons for limiting their numerical values in the first invention, but in the second invention, in addition to the additive elements in the first invention, Ti, Nb, or two species can be added as necessary. .
Ｔｉ、Ｎｂニステンレス鋼中のＣ＠ Ｔ ｉやＮｂの炭
化物として固定し耐粒界腐食性、靭性を改善する１、そ
のためＣ含有１応じてＴ ｉ 、 Ｎ ｂの一種または
二種を夫々１０ｘにＣ以上、 ５ｘｚＣ以上加える。Ti, Nb fixes C@ Ti and Nb in stainless steel as carbides to improve intergranular corrosion resistance and toughness. Therefore, depending on the C content, one or two of Ti and Nb are added at 10x each. Add C or more to 5xzC or more.
また、それらの最大添加量は夫々０．８Ｘ以下とする。Further, the maximum amount of each of them added is 0.8X or less.
Ｔｉ、Ｎｂの添加量は、鋼中のＣに対して一定址以上な
いと効果は現れず、０．８ｚを超えるとその効果は飽和
するばかりか、表面疵の原因にもなる。The amount of Ti and Nb added will not be effective unless it exceeds a certain level with respect to C in the steel, and if it exceeds 0.8z, not only will the effect be saturated, but it will also cause surface flaws.
次に本発明の実施例について述べる。Next, examples of the present invention will be described.
表に本実施例において供された鋼の化学成分並びに腐食
速度を示す。The table shows the chemical composition and corrosion rate of the steel used in this example.
表に示された組成のフエライ１へ系ステノＬス鋼、（何
れも溶体化処理済み）について、以下の手順に従って腐
食試験を実施した、。Corrosion tests were conducted on Ferrai 1 stainless steels (both solution treated) having the compositions shown in the table according to the following procedure.
試薬特級の薬品を用いて調製した実験室ＷＰＡ（５０Ｘ
Ｐ 、Ｏ、＋３ＸＳ ０４”−＋０．５ＸＦ ｅ ”＋
１．０ＸＦ −＋０．０５ｘＣｌ−）を恒温水槽で５０
℃に加熱しておき、８１減加工、湿式研摩仕上げによゆ
製作した試験片を１２０時間浸漬して腐食減量を求めた
。Laboratory WPA (50X
P, O, +3XS 04"-+0.5XF e"+
1.0XF −+0.05xCl−) in a constant temperature water bath at 50
A test piece prepared by heating to 81 °C and subjected to wet polishing was immersed for 120 hours to determine the corrosion loss.
耐食性の評価は、腐食減量から求めた腐食速度（ｇ ／
ｍ’、 ｂ ｒ）によった。Corrosion resistance was evaluated using the corrosion rate (g /
m', b r).
尚本実施例にて採用したＷＰＡ組成はその変動範囲で最
も多量のＦ−、ＣＩ−を含むので、現在製造されている
ＷＰＡのなかで最も激しい腐食を再現するものの一つと
思われる。The WPA composition adopted in this example contains the largest amount of F- and CI- within its variable range, and therefore is considered to be one of the WPAs currently manufactured that reproduces the most severe corrosion.
ＪＩＳ規格の３１６Ｌに相当するＭ鋼を始め、比較鋼は
何れも８．０ｇ／ ｍ’、 ｈ ｒ以上の激しい腐食を
示すに対し本発明鋼は何れも０．２ｇ／ｍ’、 ｈｒ禾
満の浸れた耐食性を示した。All comparison steels, including M steel, which corresponds to JIS standard 316L, showed severe corrosion of 8.0 g/m', hr or more, whereas the steels of the present invention showed severe corrosion of 0.2 g/m', hr or more. It showed excellent corrosion resistance.
次に腐食速度と鋼組成（ＣｒとＭｏ）の関係を図に示す
。Next, the relationship between corrosion rate and steel composition (Cr and Mo) is shown in the figure.
図示する如（、腐食速度が０．２ｇ／ｍ“、 ｈｒ未満
の優れた耐食性を得るためには、ＣｒとＭｏとを複合し
て含有することが必要で、１．０＊以上２．０にＭ。As shown in the figure (in order to obtain excellent corrosion resistance with a corrosion rate of less than 0.2 g/m", hr, it is necessary to contain Cr and Mo in combination, and the corrosion rate is 1.0* or more and 2.0 To M.
未満の領域では、−３＊Ｍ ｏ ＋２５．０を超えると
Ｃｒ量を必要とし、２．０＊Ｍ Ｏ〜６．０＊Ｍ ｏ
では１９．０＊を超えるＣｒ量を必要とする。In the region of less than -3*Mo +25.0, the amount of Cr is required, and from 2.0*Mo to 6.0*Mo
In this case, a Cr amount exceeding 19.0* is required.
本発明の粗製リン酸中で浸れた耐食性を有するフェライ
ト系ステンレス鋼は、現用の３１６Ｌタイプのステンレ
ス鋼が腐食するような厳しい条件でも良好なＮ（食性を
示すものである。The corrosion-resistant ferritic stainless steel soaked in crude phosphoric acid of the present invention exhibits good N corrosion resistance even under severe conditions where current 316L type stainless steel corrodes.
図は、実施例における腐食速度と鋼組成との関係グラフ
である。。The figure is a graph showing the relationship between corrosion rate and steel composition in Examples. .
Claims (1)
００％以下、Ｍｎ；１．００％以下、Ｐ；０．０６％以
下、Ｓｉ０．０３％以下、Ｎｉ；６．０％以下、Ｃｒ；
１９．０〜２８．０％、Ｍｏ；１．０〜６．０％、Ｎ；
０．０３％以下を含有し、残部が鉄及び不可避不純物か
らなり、且つ ｉ：Ｍｏが１．０％以上２．０％未満では −３×Ｍｏ＋２５．０＜％Ｃｒ≦２８．０をｉｉ：Ｍｏ
が２．０〜６．０％では １９．０＜％Ｃｒ≦２８．０を 夫々満足することを特徴とする粗製リン酸中で優れた耐
食性を有するフェライト系ステンレス鋼。 （２）重量基準にて、Ｃ；０．０４％以下、Ｓｉ；１．
００％以下、Ｍｎ；１．００％以下、Ｐ；０．０６％以
下、Ｓ；０．０３％以下、Ｎｉ；６．０％以下、Ｃｒ；
１９．０〜２８．０％、Ｍｏ；１．０〜６．０％、Ｎ；
０．０３％以下及びＮｂ；１０×％Ｃ〜０．８％、Ｔｉ
；５ｘ％Ｃ〜０．８％の一種または二種を含有し、残部
が鉄及び不可避不純物からなり、且つ ｉ：Ｍｏが１．０％以上２．０％未満では −３×Ｍｏ＋２５．０＜％Ｃｒ≦２８．０をｉｉ：Ｍｏ
が２．０〜６．０％では １９．０＜％Ｃｒ≦２８．０を 夫々満足することを特徴とする粗製リン酸中で優れた耐
食性を有するフェライト系ステンレス鋼。[Claims] (1) On a weight basis, C: 0.04% or less, Si: 1.
00% or less, Mn; 1.00% or less, P; 0.06% or less, Si 0.03% or less, Ni; 6.0% or less, Cr;
19.0-28.0%, Mo; 1.0-6.0%, N;
0.03% or less, the balance consists of iron and unavoidable impurities, and i:Mo is 1.0% or more and less than 2.0%, -3×Mo+25.0<%Cr≦28.0 ii: Mo
A ferritic stainless steel having excellent corrosion resistance in crude phosphoric acid, which satisfies 19.0<%Cr≦28.0 when Cr is 2.0 to 6.0%. (2) Based on weight, C: 0.04% or less, Si: 1.
00% or less, Mn; 1.00% or less, P; 0.06% or less, S; 0.03% or less, Ni; 6.0% or less, Cr;
19.0-28.0%, Mo; 1.0-6.0%, N;
0.03% or less and Nb; 10×%C to 0.8%, Ti
; Contains one or two of 5x%C to 0.8%, the remainder consists of iron and unavoidable impurities, and i:Mo is 1.0% or more and less than 2.0% -3xMo+25.0< %Cr≦28.0 ii:Mo
A ferritic stainless steel having excellent corrosion resistance in crude phosphoric acid, which satisfies 19.0<%Cr≦28.0 when Cr is 2.0 to 6.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61092223A JPH0772326B2 (en) | 1986-04-23 | 1986-04-23 | Ferrite stainless steel with excellent corrosion resistance in crude phosphoric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61092223A JPH0772326B2 (en) | 1986-04-23 | 1986-04-23 | Ferrite stainless steel with excellent corrosion resistance in crude phosphoric acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62250156A true JPS62250156A (en) | 1987-10-31 |
| JPH0772326B2 JPH0772326B2 (en) | 1995-08-02 |
Family
ID=14048440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61092223A Expired - Lifetime JPH0772326B2 (en) | 1986-04-23 | 1986-04-23 | Ferrite stainless steel with excellent corrosion resistance in crude phosphoric acid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0772326B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002146557A (en) * | 2000-11-08 | 2002-05-22 | Nippon Steel Corp | Lubrication surface treated stainless steel for fuel tank having excellent corrosion resistance, formability and weldability |
| JP2013199679A (en) * | 2012-03-26 | 2013-10-03 | Nippon Steel & Sumikin Stainless Steel Corp | Stainless steel having excellent corrosion resistance to high temperature lactic acid and method for using the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4850917A (en) * | 1971-10-26 | 1973-07-18 | ||
| JPS4931523A (en) * | 1972-07-24 | 1974-03-22 | ||
| JPS57114639A (en) * | 1976-04-27 | 1982-07-16 | Crucible Inc | Ferrite type stainless steel welded article |
| JPS59159974A (en) * | 1983-03-02 | 1984-09-10 | Sumitomo Metal Ind Ltd | Ferritic chromium stainless steel |
-
1986
- 1986-04-23 JP JP61092223A patent/JPH0772326B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4850917A (en) * | 1971-10-26 | 1973-07-18 | ||
| JPS4931523A (en) * | 1972-07-24 | 1974-03-22 | ||
| JPS57114639A (en) * | 1976-04-27 | 1982-07-16 | Crucible Inc | Ferrite type stainless steel welded article |
| JPS59159974A (en) * | 1983-03-02 | 1984-09-10 | Sumitomo Metal Ind Ltd | Ferritic chromium stainless steel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002146557A (en) * | 2000-11-08 | 2002-05-22 | Nippon Steel Corp | Lubrication surface treated stainless steel for fuel tank having excellent corrosion resistance, formability and weldability |
| JP2013199679A (en) * | 2012-03-26 | 2013-10-03 | Nippon Steel & Sumikin Stainless Steel Corp | Stainless steel having excellent corrosion resistance to high temperature lactic acid and method for using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0772326B2 (en) | 1995-08-02 |
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