JP4327629B2 - Austenitic stainless steel - Google Patents
Austenitic stainless steel Download PDFInfo
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- JP4327629B2 JP4327629B2 JP2004081820A JP2004081820A JP4327629B2 JP 4327629 B2 JP4327629 B2 JP 4327629B2 JP 2004081820 A JP2004081820 A JP 2004081820A JP 2004081820 A JP2004081820 A JP 2004081820A JP 4327629 B2 JP4327629 B2 JP 4327629B2
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims description 16
- 230000007797 corrosion Effects 0.000 claims description 69
- 238000005260 corrosion Methods 0.000 claims description 69
- 150000003839 salts Chemical class 0.000 claims description 26
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 150000003841 chloride salts Chemical class 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- -1 NaCl Chemical class 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Description
本発明は、高温塩害腐食に対する耐食性が要求される自動車用排気管などに使用する材料として好適なオーステナイト系ステンレス鋼に関する。詳しくは、凍結防止のために融雪剤を道路に撒く地域を通行する自動車の排気管などで問題になる、ＮａＣｌ、ＣａＣｌ2、ＭｇＣｌ2、ＫＣｌなどの塩化物塩による高温塩害腐食に対し、重ね合った板間の隙間部において腐食抵抗を高めたオーステナイト系ステンレス鋼に関する。 The present invention relates to an austenitic stainless steel suitable as a material used for an automobile exhaust pipe or the like that requires corrosion resistance against high temperature salt damage corrosion. Specifically, repeated high-temperature salt corrosion corrosion caused by chloride salts such as NaCl, CaCl 2 , MgCl 2 , KCl, which is a problem in the exhaust pipes of automobiles that pass through snow-melting agents on roads to prevent freezing. The present invention relates to an austenitic stainless steel having enhanced corrosion resistance in a gap between joined plates.
従来、たとえば自動車用の排気管部材には、ＳＵＳ３０４に代表されるオーステナイト系ステンレス鋼が一般に用いられている。この種のオーステナイト系ステンレス鋼は、要求される特性として、高温強度、耐高温酸化性、疲労寿命、成形性、溶接性などの基本的材料特性に加え、自動車が凍結防止のための融雪剤を散布した道路を通過することを考慮すると、ＮａＣｌ、ＣａＣｌ2、ＭｇＣｌ2、ＫＣｌなどの塩化物塩に対して耐高温塩害腐食性に優れた特性を保有していることが重要である。 Conventionally, for example, austenitic stainless steel represented by SUS304 is generally used for an exhaust pipe member for automobiles. This type of austenitic stainless steel has required properties such as high-temperature strength, high-temperature oxidation resistance, fatigue life, formability, and weldability, as well as a snow melting agent for automobiles to prevent freezing. Considering passing through the sprayed road, it is important that the salt has excellent high temperature salt corrosion resistance with respect to chloride salts such as NaCl, CaCl 2 , MgCl 2 and KCl.
そのため、従来は、この種のオーステナイト系ステンレス鋼に対し、耐高温塩害腐食性を保有させるために、特開２００３−２６８５０４号公報や特開２００１−５９１４１号公報などで開示されたような対策・改善が一般に行われている。
従来のこれら対策材は、塩化物塩を付着させ、大気雰囲気中で６５０℃以上の高温に加熱される環境下で優れた耐食性を示す。他方、長時間走行した後の実車の排気管における腐食状況を観察すると、大気に触れる部分の腐食は軽微であるが、重ね合った板間の隙間部分では、粒界浸食型の腐食がかなり進行している。 These conventional countermeasure materials adhere to a chloride salt and exhibit excellent corrosion resistance in an environment heated to a high temperature of 650 ° C. or higher in an air atmosphere. On the other hand, when observing the corrosion situation in the exhaust pipe of an actual vehicle after running for a long time, the corrosion of the part that touches the atmosphere is slight, but the intergranular erosion-type corrosion progresses considerably in the gap part between the overlapping plates. is doing.
そこで、この状況を実験室的に再現するため、隙間構造を有する試験片を用いて高温塩害腐食試験を実施した。その結果、６５０℃以上の高温域では、前記隙間部と大気側（非隙間部）の双方で速やかに腐食が進行し、前記従来の対策材は高い抵抗力を示した。他方、５００〜６００℃の中温域では、大気側（非隙間部）の腐食が急速に軽減されるのに対し、隙間部では、粒界型の腐食が進行し、実車の排気管の腐食形態と類似の腐食形態を示した。この中温域で発生する隙間部の塩害腐食に対して、前記従来の対策材は十分な抵抗力を示さず、該隙間部での腐食は、６５０℃以上での大気側（非隙間部）の腐食とは腐食機構の異なる現象と判断された。また、粒界型の腐食は、応力が集中しやすい形状であり、疲労破壊の起点となり得ることから、排気管の寿命に大きな影響を与える因子となる。そのため、従来の耐高温塩害腐食の対策材は、実環境で自動車用排気管の耐久性を十分改善したとは言えず、従来、この隙間部での耐高温塩害腐食性を改善することが課題であった。 Therefore, in order to reproduce this situation in a laboratory, a high temperature salt damage corrosion test was performed using a test piece having a gap structure. As a result, in the high temperature region of 650 ° C. or higher, corrosion rapidly progressed both on the gap and on the atmosphere side (non-gap), and the conventional countermeasure material showed high resistance. On the other hand, in the middle temperature range of 500 to 600 ° C., corrosion on the atmosphere side (non-gap part) is rapidly reduced, whereas in the gap part, intergranular corrosion proceeds, and the corrosion pattern of the exhaust pipe of the actual vehicle. It showed a similar corrosion form. The conventional countermeasure material does not exhibit sufficient resistance against the salt damage corrosion of the gap portion occurring in the intermediate temperature range, and the corrosion in the gap portion is caused by the atmospheric side (non-gap portion) at 650 ° C. or more. Corrosion was judged to be a phenomenon with a different corrosion mechanism. Further, the grain boundary type corrosion is a shape in which stress is easily concentrated, and can be a starting point of fatigue failure, and thus is a factor that greatly affects the life of the exhaust pipe. Therefore, it can not be said that conventional high temperature salt corrosion resistant materials have sufficiently improved the durability of automobile exhaust pipes in the actual environment. Met.
そこで、本発明の目的は、自動車用排気管などの寿命延長のために、重ね合った板間の隙間部に生ずる高温塩害腐食に対して優れた耐食性を有するオーステナイト系ステンレス鋼を提供することにある。 Accordingly, an object of the present invention is to provide an austenitic stainless steel having excellent corrosion resistance against high temperature salt damage corrosion occurring in a gap portion between stacked plates in order to extend the life of an automobile exhaust pipe or the like. is there.
そのため、本発明者らは、上述のように分析し、隙間部での高温塩害腐食が粒界型の腐食であり、６５０℃以上の大気側非隙間部での高温塩害腐食とは異なるメカニズムであることに着目し、鋭意研究を重ねた結果、下記の如く構成した化学組成からなるオーステナイト系ステンレス鋼によれば、隙間部で生じる高温塩害腐食を抑制し、たとえ寒冷地使用される、自動車用排気管などの材料として用いられた場合でも、その寿命を著しく延長させることができることを見い出し、本発明を完成するに至った。 Therefore, the inventors analyzed as described above, and the high temperature salt damage corrosion in the gap is a grain boundary type corrosion, and the mechanism is different from the high temperature salt damage corrosion in the non-gap portion on the air side at 650 ° C. or higher. As a result of intensive research with a focus on a certain point, according to the austenitic stainless steel having the chemical composition configured as follows, the high temperature salt damage corrosion generated in the gap portion is suppressed, and it is used even in cold regions, even for automobiles. Even when used as a material for exhaust pipes and the like, it has been found that the lifetime can be significantly extended, and the present invention has been completed.
そこで、請求項１に記載の発明は、質量％で、Ｃ：０．０８％以下、Ｓｉ：１．５〜２．５％、Ｍｎ：０．４〜２．０％、Ｐ：０．０４％以下、Ｓ：０．０２％以下、Ｃｒ：１９．０〜２１．０％、Ｎｉ：９．０〜１３．０％、Ｍｏ：０．７〜２．０％、Ｃｕ：１．５〜２．５％、Ｎ：０．２０％以下であり、残部がＦｅおよび不可避的不純物からなるオーステナイト系ステンレス鋼で、重ね合った板間の隙間部に発生する高温塩害腐食に対して優れた耐食性を有し、自動車用排気管として用いてなることを特徴とする。 Therefore, the invention according to claim 1 is mass%, C: 0.08% or less, Si: 1.5-2.5%, Mn: 0.4-2.0%, P: 0.04. % Or less, S: 0.02% or less, Cr: 19.0 to 21.0 %, Ni: 9.0 to 13.0%, Mo: 0.7 to 2.0%, Cu: 1.5 to Austenitic stainless steel with 2.5%, N: 0.20% or less, the balance being Fe and inevitable impurities, excellent corrosion resistance against high-temperature salt damage corrosion occurring in the gaps between the stacked plates have a, wherein Rukoto such used as vehicle exhaust pipes.
請求項２に記載の発明は、請求項１に記載のオーステナイト系ステンレス鋼において、前記自動車用排気管が、波板を螺旋状に巻いて多層状とした可撓管であることを特徴としている。 According to a second aspect of the invention, the austenitic stainless steel according to claim 1, wherein the vehicle exhaust pipe, are characterized by a flexible tube with a multi-layered by winding a corrugated plate in a spiral .
本発明のオーステナイト系ステンレス鋼によれば、大気側の非隙間部だけではなく、隙間部に生じる高温塩害腐食に対しても優れた耐食性を示し、たとえ寒冷地で使用される、自動車用排気管等に用いられた場合であっても、寿命を著しく延長させることができる。 According to the austenitic stainless steel of the present invention, it exhibits excellent corrosion resistance against high-temperature salt damage corrosion occurring not only in the non-gap portion on the air side but also in the gap portion, and is used in a cold region, an automobile exhaust pipe Even if it is used for the above, the life can be remarkably extended.
以下、本発明の実施の形態について詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail.
本発明によるオーステナイト系ステンレス鋼は、その化学組成が、質量％で、Ｃ：０．０８％以下、Ｃｒ：１８．０〜２３．０％、Ｓｉ：１．５〜２．５％、Ｎｉ：９．０〜１３．０％、Ｍｎ：０．４〜２．０％、Ｍｏ：０．７〜２．０％、Ｐ：０．０４％以下、Ｃｕ：１．５〜２．５％、Ｓ：０．０２％以下、Ｎ：０．２０％以下であり、残部がＦｅおよび不可避的不純物からなる。そして、本発明鋼は、従来からあるＳＵＳ３０４、ＳＵＳ３１６Ｌなどの一般的なオーステナイト系ステンレス鋼と同様の手段で溶製し、熱間圧延や冷間圧延を経て薄鋼板を製造する。この薄鋼板を波板状に成形した後、螺旋状に巻いて多層状とした可撓管に加工し、たとえば自動車用排気管に用いられる。そこで、以下、非隙間部は自動車用排気管の大気に触れる部分を示し、隙間部は重ね合った波状薄板間の僅かな隙間を示すこととする。 The chemical composition of the austenitic stainless steel according to the present invention is, by mass%, C: 0.08% or less, Cr: 18.0 to 23.0%, Si: 1.5 to 2.5%, Ni: 9.0-13.0%, Mn: 0.4-2.0%, Mo: 0.7-2.0%, P: 0.04% or less, Cu: 1.5-2.5%, S: 0.02% or less, N: 0.20% or less, with the balance being Fe and inevitable impurities. The steel of the present invention is melted by the same means as conventional austenitic stainless steels such as SUS304 and SUS316L, and a thin steel plate is produced through hot rolling and cold rolling. After forming this thin steel plate into a corrugated plate, it is spirally wound into a multilayered flexible tube, which is used, for example, in an automobile exhaust pipe. Therefore, hereinafter, the non-gap portion indicates a portion of the automobile exhaust pipe that comes into contact with the atmosphere, and the gap portion indicates a slight gap between the overlapping wavy thin plates.
さて、本発明鋼において、「Ｃ」はオーステナイト組織の安定と高温強度を高めるために有効であるが、６００℃程度の高温になると、Ｃｒと炭化物を形成し結晶粒界の耐食性を損なうことが知られており、０．０８％以下であることが求められる。 In the steel of the present invention, “C” is effective for increasing the stability and high temperature strength of the austenite structure. However, when the temperature is about 600 ° C., it forms carbides with Cr and impairs the corrosion resistance of the grain boundaries. It is known and is required to be 0.08% or less.
「Ｓｉ」は、耐酸化性及び耐高温塩害腐食性の向上に効果があり、大気雰囲気下の非隙間部での高温塩害腐食に対して３％を越えてもさらに高い方が有効であるが、隙間部での高温塩害腐食に対して２％以上では効果は飽和傾向にある、また、２．５％を越える高Ｓｉになると、製造時の熱間加工性を悪くする。一方、１．５未満では高温塩害腐食に対する効果が不充分であり、従って１．５〜２．５％が適当である。 “Si” is effective in improving oxidation resistance and high-temperature salt damage corrosion resistance, and even higher than 3% against high-temperature salt damage corrosion in a non-gap portion in an air atmosphere is more effective. The effect tends to saturate at 2% or more with respect to high-temperature salt damage corrosion in the gap, and when high Si exceeds 2.5%, the hot workability at the time of manufacture deteriorates. On the other hand, if it is less than 1.5, the effect on high temperature salt corrosion is insufficient, so 1.5 to 2.5% is appropriate.
「Ｍｎ」は、溶製時の脱酸材として０．４％以上添加が必要である。溶接高温割れに有害なＳをＭｎＳとして固定できるが、２％を超えてもその効果は向上しないため、０．４〜２．０％とする。 “Mn” needs to be added in an amount of 0.4% or more as a deoxidizer during melting. S which is harmful to welding hot cracking can be fixed as MnS, but if it exceeds 2%, the effect is not improved, so 0.4 to 2.0%.
「Ｐ」および「Ｓ」は、溶接高温割れに有害である。そこで、「Ｐ」は０．０４％まで許容され、「Ｓ」は０．０１％以下に低減することが望ましいが、０．０２％まで許容される。 “P” and “S” are detrimental to hot weld cracking. Therefore, “P” is allowed to be 0.04% and “S” is preferably reduced to 0.01% or less, but is allowed to be 0.02%.
「Ｃｒ」は、６５０℃以上の大気雰囲気（非隙間）の高温塩害腐食では有害であるために減量が望ましく、室温環境の腐食に対してはＣｒが多い方が耐食性は良好である。実車で中心となる６００℃以下の隙間部における高温塩害腐食に対して、最も腐食量が少ないのは２０％前後であり、それより多くても少なくても腐食量は増大する。高温塩害腐食に対して有効である含有量は、１８．０〜２３．０％であるが、望ましくは１９．０〜２１．０％である。 “Cr” is harmful in high-temperature salt damage corrosion in an air atmosphere (non-gap) at 650 ° C. or higher, so it is desirable to reduce the weight. For corrosion in a room temperature environment, the more Cr, the better the corrosion resistance. With respect to high-temperature salt damage corrosion at a gap of 600 ° C. or less, which is the center of an actual vehicle, the amount of corrosion is about 20%, and the amount of corrosion increases even if it is more or less. The content that is effective against high temperature salt corrosion is 18.0 to 23.0%, preferably 19.0 to 21.0%.
「Ｍｏ」は、耐酸化性の向上に効果があり、そのためには０．７％以上が必要である。また、２％を越えても耐酸化性の向上効果が増大しない上に、高価であることと、製造時に熱間割れを生じることから、０．７〜２．０％とする。 “Mo” is effective in improving the oxidation resistance, and 0.7% or more is necessary for that purpose. Moreover, even if it exceeds 2%, the effect of improving the oxidation resistance is not increased, and since it is expensive and hot cracks occur during production, it is set to 0.7 to 2.0%.
「Ｃｕ」は、隙間部における耐高温塩害腐食性の向上に効果があり、そのためには１．５％以上が必要である。また、２．５％を越えても、隙間部における耐高温塩害腐食性の向上効果が増大しない上に、製造性を低下させることから、１．５〜２．５％とする。 “Cu” is effective in improving the high temperature salt damage corrosion resistance in the gap, and for that purpose, 1.5% or more is required. Moreover, even if it exceeds 2.5%, since the improvement effect of the high temperature salt damage corrosion resistance in a clearance gap does not increase and manufacturability is reduced, it is set to 1.5 to 2.5%.
「Ｎ」は、オーステナイト組織の安定と高温強度を高めるのに有効であるが、耐力を高くすることで冷間圧延時の生産性を低下させることから、０．２０％以下とする。 “N” is effective for increasing the stability of the austenite structure and the high-temperature strength, but lowering the productivity during cold rolling by increasing the yield strength makes it 0.20% or less.
「Ｎｉ」は、オーステナイト生成元素としてオーステナイト系ステンレス鋼の基本元素であり、溶接時のδフェライト生成が適量となるよう９．０〜１３．０％とする。 “Ni” is a basic element of austenitic stainless steel as an austenite-generating element, and is 9.0 to 13.0% so that δ ferrite generation at the time of welding becomes an appropriate amount.
なお、残部は、「Ｆｅ」および不可避的不純物からなる組成配分とする。 The balance is “Fe” and an inevitable impurity composition distribution.
次に、以下に示す実施例に基づいて、本発明を更に詳細に説明するが、本発明は、この実施例に限定されるものでないのは、勿論である。 Next, the present invention will be described in more detail based on the following examples, but the present invention is of course not limited to these examples.
本発明者らは、本発明によるオーステナイト系ステンレス鋼の効果を確認するための試験を行った。この試験では、下記の「表１」に示す発明鋼および比較鋼を高周波溶解炉で所定の化学成分に溶解し、鋼塊を得た。更に、この鋼塊を熱間圧延および冷間圧延により厚さ０．５ｍｍの板を得、１１００℃にて溶体化処理を行い、表面の酸化スケールを除去した。この板から幅３０ｍｍ長さ６０ｍｍの小片を切り出し、その小片を２枚重ね、２つの長辺と１つの短辺をシーム溶接機により溶接し、一つの短辺部分が開口した腐食試験片を作製した。 The present inventors conducted a test for confirming the effect of the austenitic stainless steel according to the present invention. In this test, the invented steel and comparative steel shown in the following “Table 1” were dissolved in predetermined chemical components in a high-frequency melting furnace to obtain a steel ingot. Further, this steel ingot was hot-rolled and cold-rolled to obtain a plate having a thickness of 0.5 mm, and solution treatment was performed at 1100 ° C. to remove the oxide scale on the surface. Cut out a small piece of width 30mm and length 60mm from this plate, stack the two pieces, weld two long sides and one short side with a seam welder, and make a corrosion test piece with one short side opening did.
高温塩害腐食試験は、１０質量％のＮａＣｌと１０質量％のＣａＣｌ2を含んだ水溶液を融雪剤の模擬液とし、この水溶液中に腐食試験片を、超音波をかけながら５分間浸漬し、その後、大気雰囲気の電気炉中で実車を模擬するのに好適である温度６００℃にて２時間の加熱を行う。試料は、開口部が横に位置するような試料台を用い、立て掛けて電気炉内に設置した。これを１サイクルとする。そして、２０サイクル繰返す腐食試験を行った。 In the high temperature salt damage corrosion test, an aqueous solution containing 10% by mass of NaCl and 10% by mass of CaCl 2 was used as a snow melting agent simulation solution, and the corrosion test piece was immersed in this aqueous solution for 5 minutes while applying ultrasonic waves. Then, heating is performed for 2 hours at a temperature of 600 ° C., which is suitable for simulating an actual vehicle in an electric furnace in an air atmosphere. The sample was stood and placed in an electric furnace using a sample stand with an opening positioned laterally. This is one cycle. And the corrosion test which repeats 20 cycles was done.
次いで、この高温塩害腐食試験により得た試料の断面写真から板厚を測定し、各試料の腐食量を評価した。腐食量は、試験片の外面側の非隙間部と、隙間部側でそれぞれ求めることとした。開口部のある試料とは別に、開口部のない４辺を溶接した試験片を同時に試験し、外面側非隙間部の腐食量を測定する。そして、開口部がある腐食試験片の両面の腐食量の和から、別に測定した開口部がない腐食試験片の外面側の腐食量を引いた値を隙間部側の腐食量とした。腐食試験の結果、隙間部分の腐食量は、「表１」及び「図１」に示す結果となり、隙間部の腐食量について、発明鋼は比較鋼に比べて腐食量が少ないことが判る。また、Ｃｒ量と腐食量の関係は「図２」に示す結果となり、２０質量％付近が最も腐食量が少ない。 Next, the plate thickness was measured from a cross-sectional photograph of the sample obtained by this high temperature salt damage corrosion test, and the amount of corrosion of each sample was evaluated. The amount of corrosion was determined on the non-gap portion on the outer surface side of the test piece and on the gap portion side, respectively. Separately from the sample with the opening, test pieces welded on the four sides without the opening are simultaneously tested to measure the corrosion amount of the non-gap portion on the outer surface side. And the value which subtracted the corrosion amount of the outer surface side of the corrosion test piece which does not have the opening part measured separately from the sum of the corrosion amount of both surfaces of the corrosion test piece with an opening part was made into the corrosion amount of the clearance part side. As a result of the corrosion test, the corrosion amount of the gap portion is shown in “Table 1” and “FIG. 1”, and it is understood that the corrosion amount of the gap portion of the invention steel is smaller than that of the comparative steel. Further, the relationship between the Cr amount and the corrosion amount is the result shown in FIG. 2, and the amount of corrosion is the smallest in the vicinity of 20% by mass.
Claims (2)
Ｃ ：０．０８％以下、 Ｃｒ：１９．０〜２１．０％、
Ｓｉ：１．５〜２．５％、 Ｎｉ：９．０〜１３．０％、
Ｍｎ：０．４〜２．０％、 Ｍｏ：０．７〜２．０％、
Ｐ ：０．０４％以下、 Ｃｕ：１．５〜２．５％、
Ｓ ：０．０２％以下、 Ｎ ：０．２０％以下であり、
残部がＦｅおよび不可避的不純物からなり、重ね合った板間の隙間部に発生する高温塩害腐食に対して耐食性に優れ、自動車用排気管として用いてなる、オーステナイト系ステンレス鋼。 % By mass
C: 0.08% or less, Cr: 19.0-21.0 %,
Si: 1.5 to 2.5%, Ni: 9.0 to 13.0%,
Mn: 0.4 to 2.0%, Mo: 0.7 to 2.0%,
P: 0.04% or less, Cu: 1.5-2.5%,
S: 0.02% or less, N: 0.20% or less,
An austenitic stainless steel, the balance of which consists of Fe and inevitable impurities, is excellent in corrosion resistance against high temperature salt corrosion generated in the gaps between the stacked plates, and is used as an exhaust pipe for automobiles .
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| US20180080106A1 (en) * | 2015-03-31 | 2018-03-22 | Nippon Steel & Sumikin Stainless Steel Corporation | Stainless steel sheet for exhaust system part use excellent in intermittent oxidation characteristic and exhaust system part |
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