JP2016050320A - Stainless steel excellent in formic acid resistance - Google Patents
Stainless steel excellent in formic acid resistance Download PDFInfo
- Publication number
- JP2016050320A JP2016050320A JP2014174619A JP2014174619A JP2016050320A JP 2016050320 A JP2016050320 A JP 2016050320A JP 2014174619 A JP2014174619 A JP 2014174619A JP 2014174619 A JP2014174619 A JP 2014174619A JP 2016050320 A JP2016050320 A JP 2016050320A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- less
- formic acid
- resistance
- 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
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 45
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 235000019253 formic acid Nutrition 0.000 title claims abstract description 34
- 239000010935 stainless steel Substances 0.000 title claims description 6
- 238000005260 corrosion Methods 0.000 claims abstract description 36
- 230000007797 corrosion Effects 0.000 claims abstract description 35
- 229910001105 martensitic stainless steel Inorganic materials 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 239000012535 impurity Substances 0.000 claims abstract description 17
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims description 16
- 229910052720 vanadium Inorganic materials 0.000 claims description 15
- 229910052758 niobium Inorganic materials 0.000 claims description 12
- 229910052715 tantalum Inorganic materials 0.000 claims description 11
- 229910052726 zirconium Inorganic materials 0.000 claims description 11
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 9
- 239000003502 gasoline Substances 0.000 abstract description 8
- 229910052804 chromium Inorganic materials 0.000 abstract description 6
- 239000011651 chromium Substances 0.000 description 49
- 239000000446 fuel Substances 0.000 description 14
- 230000007423 decrease Effects 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910003470 tongbaite Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
Description
この発明は、例えば、自動車燃料ポンプ部材や燃焼供給系部品などに使用される汎用ステンレス鋼材に関し、劣化ガソリンのようなギ酸が含まれる環境においても、優れた耐食性を有するステンレス鋼に関する。 The present invention relates to a general-purpose stainless steel material used for, for example, automobile fuel pump members and combustion supply system parts, and relates to stainless steel having excellent corrosion resistance even in an environment containing formic acid such as deteriorated gasoline.
従来技術とその問題点について説明する。従来の技術では、例えば、自動車燃料ポンプ部材には、高い強度と耐食性が求められることから、汎用のマルテンサイト系ステンレス鋼が使用されている。さらに、燃焼供給系部品などにも耐食性が求められるため、汎用のフェライト系ステンレス鋼が使用されることがある。これらは良質なガソリンに対しては耐食性に問題はないものの、劣化ガソリンのようなギ酸が含まれる環境での耐食性に関しては考慮されていない。 The prior art and its problems will be described. In the conventional technology, for example, a general-purpose martensitic stainless steel is used for an automobile fuel pump member because high strength and corrosion resistance are required. Furthermore, since corrosion resistance is also required for combustion supply system parts and the like, general-purpose ferritic stainless steel may be used. Although there is no problem in corrosion resistance for high-quality gasoline, no consideration is given to corrosion resistance in an environment containing formic acid such as deteriorated gasoline.
その他の従来技術としては、自動車エンジン用燃料噴射装置の材料として、Ｃ量を低下させ、Ｍｏを添加することで耐食性を改善した鋼が提案されている（例えば、特許文献１参照。）。しかし、このものは、メタノールに対する耐食性は考慮されているが、ギ酸に対する耐食性は考慮されていない。 As another conventional technique, steel that has improved corrosion resistance by reducing the amount of C and adding Mo has been proposed as a material for a fuel injection device for an automobile engine (see, for example, Patent Document 1). However, the corrosion resistance to methanol is considered, but the corrosion resistance to formic acid is not considered.
さらに、燃料噴射ノズル材や、内燃機関用オイルリング材として、ＮｂやＶやＣｕを添加することで耐カルボン酸性を向上した鋼が提案されている（例えば、燃料噴射ノズル材としては特許文献２参照、内燃機関用オイルリング材としては特許文献３参照。）。しかし、これらは、いずれも耐ギ酸性に及ぼすＣｒ炭化物の影響が考慮されていない。 Furthermore, as a fuel injection nozzle material or an oil ring material for an internal combustion engine, steel having improved carboxylic acid resistance by adding Nb, V, or Cu has been proposed (for example, Patent Document 2 as a fuel injection nozzle material). (Refer to Patent Document 3 for an oil ring material for an internal combustion engine.) However, none of these considers the effect of Cr carbides on formic acid resistance.
また、燃料タンクや燃料パイプ用のフェライト系ステンレス鋼板として、ＭｏやＶを添加することで劣化ガソリンに対する耐食性向上させたフェライト系ステンレス鋼が提案されている（例えば、特許文献４参照。）。しかし、このものは、ＭｏやＶが高価な元素であるため、コスト増を招く問題がある。 Further, as a ferritic stainless steel plate for fuel tanks and fuel pipes, ferritic stainless steel that has been improved in corrosion resistance against deteriorated gasoline by adding Mo or V has been proposed (see, for example, Patent Document 4). However, this has a problem of increasing costs because Mo and V are expensive elements.
本発明が解決しようとする課題は、劣化ガソリンのようなギ酸が存在する自動車の燃料ポンプ部材や燃焼供給系の部品などにおける環境では、これらの部材や部品などの材料の腐食が懸念されるので、ギ酸に対する優れた耐食性を有するステンレス鋼を提供することである。 The problem to be solved by the present invention is that there is a concern about corrosion of materials such as fuel pump members of automobiles and parts of combustion supply systems where formic acid such as deteriorated gasoline exists in such environments. It is to provide a stainless steel having excellent corrosion resistance against formic acid.
課題を解決するための本発明の手段は、請求項１の手段では、質量％で、Ｃ：０．００３〜０．１２０％、Ｓｉ：０．１０〜１．００％、Ｍｎ：０．１０〜１．００％、Ｐ：０．０４０％以下、Ｓ：０．０３０％以下、Ｃｒ：１１．０％〜２４．００％、Ｎｉ：２．００％以下、Ｍｏ：３．００％以下、Ｃｕ：０．１０〜２．００％、Ｎ：０．０１〜０．１０％を含有し、残部Ｆｅおよび不可避不純物からなり、かつ（Ｃｒ＋１．５Ｍｏ）×３．０Ｃは８．５０以下、および５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕは１３６以上とすることを特徴とする耐ギ酸性に優れたフェライト系ステンレス鋼である。 The means of the present invention for solving the problem is that, in the means of claim 1, C: 0.003 to 0.120%, Si: 0.10 to 1.00%, Mn: 0.10 in mass%. -1.00%, P: 0.040% or less, S: 0.030% or less, Cr: 11.0% -24.00%, Ni: 2.00% or less, Mo: 3.00% or less, Cu: 0.10 to 2.00%, N: 0.01 to 0.10%, consisting of remaining Fe and inevitable impurities, and (Cr + 1.5Mo) × 3.0C is 8.50 or less, and 58Ni + Cr + 92Mo + 259Cu is a ferritic stainless steel excellent in formic acid resistance characterized by being 136 or more.
請求項２の手段では、請求項１の化学成分に加えて、質量％で、Ｔｉ：０．１０〜２．００％、Ｎｂ：０．１０〜２．００％、Ｖ：０．１０〜２．００％、Ｔａ：０．１０〜２．００％、Ｚｒ：０．１０〜２．００％のうちのいずれか１種または２種以上を０．１０〜２．００％含有し、残部Ｆｅおよび不可避不純物からなり、かつ（Ｃｒ＋１．５Ｍｏ）×３．０Ｃは８．５０以下、および５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕは１３６以上とすることを特徴とする耐ギ酸性に優れたフェライト系ステンレス鋼である。 In the means of claim 2, in addition to the chemical component of claim 1, by mass%, Ti: 0.10 to 2.00%, Nb: 0.10 to 2.00%, V: 0.10 to 2 0.001%, Ta: 0.10 to 2.00%, Zr: 0.10 to 2.00%, or any one or more of 0.10 to 2.00%, and the balance Fe It is a ferritic stainless steel excellent in formic acid resistance, characterized in that it is composed of inevitable impurities and (Cr + 1.5Mo) × 3.0C is 8.50 or less and 58Ni + Cr + 92Mo + 259Cu is 136 or more.
請求項３の手段では、請求項１の化学成分に加えて、質量％で、Ｂ：０．００１〜０．０１０％を含有し、残部Ｆｅおよび不可避不純物からなり、かつ（Ｃｒ＋１．５Ｍｏ）×３．０Ｃは８．５０以下、および５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕは１３６以上とすることを特徴とする耐ギ酸性に優れたフェライト系ステンレス鋼である。 In the means of claim 3, in addition to the chemical component of claim 1, B: 0.001 to 0.010% is contained in mass%, the balance is Fe and inevitable impurities, and (Cr + 1.5Mo) × 3.0C is 8.50 or less, and 58Ni + Cr + 92Mo + 259Cu is 136 or more, and is a ferritic stainless steel excellent in formic acid resistance.
請求項４の手段では、請求項１の化学成分に加えて、質量％で、Ｔｉ：０．１０〜２．００％、Ｎｂ：０．１０〜２．００％、Ｖ：０．１０〜２．００％、Ｔａ：０．１０〜２．００％、Ｚｒ：０．１０〜２．００％のうちのいずれか１種または２種以上を０．１０〜２．００％含有し、さらに、Ｂ：０．００１〜０．０１０％を含有し、残部Ｆｅおよび不可避不純物からなり、かつ（Ｃｒ＋１．５Ｍｏ）×３．０Ｃは８．５０以下、および５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕは１３６以上とすることを特徴とする耐ギ酸性に優れたフェライト系ステンレス鋼である。 In the means of claim 4, in addition to the chemical component of claim 1, by mass%, Ti: 0.10 to 2.00%, Nb: 0.10 to 2.00%, V: 0.10 to 2 0.000%, Ta: 0.10 to 2.00%, Zr: 0.10 to 2.00%, containing one or more of 0.10 to 2.00%, B: 0.001 to 0.010%, balance Fe and inevitable impurities, (Cr + 1.5Mo) × 3.0C is 8.50 or less, and 58Ni + Cr + 92Mo + 259Cu is 136 or more Ferritic stainless steel with excellent formic acid resistance.
請求項５の手段では、質量％で、Ｃ：０．０１０〜０．７５０％、Ｓｉ：０．１０〜１．００％、Ｍｎ：０．１０〜１．００％、Ｐ：０．０４０％以下、Ｓ：０．０３０％以下、Ｃｒ：１１．０％〜１８．００％、Ｎｉ：２．００％以下、Ｍｏ：３．００％以下、Ｃｕ：０．１０〜２．００％、Ｎ：０．０１〜０．１０％を含有し、残部Ｆｅおよび不可避不純物からなり、かつ（Ｃｒ＋１．５Ｍｏ）×Ｃは８．５０以下、および５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕは１３６以上とすることを特徴とする耐ギ酸性に優れたマルテンサイト系ステンレス鋼である。 In the means of claim 5, in mass%, C: 0.010-0.750%, Si: 0.10-1.00%, Mn: 0.10-1.00%, P: 0.040% Hereinafter, S: 0.030% or less, Cr: 11.0% to 18.00%, Ni: 2.00% or less, Mo: 3.00% or less, Cu: 0.10 to 2.00%, N : 0.01 to 0.10%, balance Fe and inevitable impurities, and (Cr + 1.5Mo) × C is 8.50 or less and 58Ni + Cr + 92Mo + 259Cu is 136 or more Is an excellent martensitic stainless steel.
請求項６の手段では、請求項５の化学成分に加えて、質量％で、Ｔｉ：０．１０〜２．００％、Ｎｂ：０．１０〜２．００％、Ｖ：０．１０〜２．００％、Ｔａ：０．１０〜２．００％、Ｚｒ：０．１０〜２．００％のうちのいずれか１種または２種以上を０．１０〜２．００％含有し、残部Ｆｅおよび不可避不純物からなり、かつ（Ｃｒ＋１．５Ｍｏ）×Ｃは８．５０以下、および５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕは１３６以上とすることを特徴とする耐ギ酸性に優れたマルテンサイト系ステンレス鋼である。 In the means of claim 6, in addition to the chemical component of claim 5, in terms of mass, Ti: 0.10 to 2.00%, Nb: 0.10 to 2.00%, V: 0.10 to 2 0.001%, Ta: 0.10 to 2.00%, Zr: 0.10 to 2.00%, or any one or more of 0.10 to 2.00%, and the balance Fe Further, it is a martensitic stainless steel excellent in formic acid resistance, characterized in that it is composed of inevitable impurities and (Cr + 1.5Mo) × C is 8.50 or less and 58Ni + Cr + 92Mo + 259Cu is 136 or more.
請求項７の手段では、請求項５の化学成分に加えて、質量％で、Ｂ：０．００１〜０．０１０％を含有し、残部Ｆｅおよび不可避不純物からなり、かつ（Ｃｒ＋１．５Ｍｏ）×Ｃは８．５０以下、および５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕは１３６以上とすることを特徴とする耐ギ酸性に優れたマルテンサイト系ステンレス鋼である。 In the means of claim 7, in addition to the chemical component of claim 5, B: 0.001 to 0.010% by mass%, comprising the balance Fe and inevitable impurities, and (Cr + 1.5Mo) × C is 8.50 or less, and 58Ni + Cr + 92Mo + 259Cu is 136 or more, and is a martensitic stainless steel excellent in formic acid resistance.
請求項８の手段では、請求項５の化学成分に加えて、質量％で、Ｔｉ：０．１０〜２．００％、Ｎｂ：０．１０〜２．００％、Ｖ：０．１０〜２．００％、Ｔａ：０．１０〜２．００％、Ｚｒ：０．１０〜２．００％のうちのいずれか１種または２種以上を０．１０〜２．００％含有し、さらに、Ｂ：０．００１〜０．０１０％を含有し、残部Ｆｅおよび不可避不純物からなり、かつ（Ｃｒ＋１．５Ｍｏ）×Ｃは８．５０以下、および５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕは１３６以上とすることを特徴とする耐ギ酸性に優れたマルテンサイト系ステンレス鋼である。 In the means of claim 8, in addition to the chemical component of claim 5, in terms of mass, Ti: 0.10 to 2.00%, Nb: 0.10 to 2.00%, V: 0.10 to 2 0.000%, Ta: 0.10 to 2.00%, Zr: 0.10 to 2.00%, containing one or more of 0.10 to 2.00%, B: 0.001 to 0.010%, consisting of remaining Fe and inevitable impurities, (Cr + 1.5Mo) × C is 8.50 or less, and 58Ni + Cr + 92Mo + 259Cu is 136 or more, formic acid resistant It is a martensitic stainless steel with excellent properties.
本願の請求項１〜４の手段のフェライト系ステンレス鋼および請求項５〜８の手段のマルテンサイト系ステンレス鋼は、いずれのステンレス鋼も、ＭｏやＶなどの高価な元素の含有量を抑制しているにもかかわらず、自動車の燃料ポンプ部材や燃焼の供給系部品などの鋼材として使用されるとき、劣化ガソリンのようなギ酸が含まれる環境下において優れた耐食性を有する。 The ferritic stainless steel of the means of claims 1 to 4 and the martensitic stainless steel of the means of claims 5 to 8 suppress the content of expensive elements such as Mo and V. Nevertheless, when used as a steel material for automobile fuel pump members and combustion supply system parts, it has excellent corrosion resistance in an environment containing formic acid such as deteriorated gasoline.
本発明の実施するための形態に先立って、本願の請求項に係る発明の化学成分の限定理由について説明する。なお、以下の各化学成分における％は、質量％である。 Prior to the embodiments for carrying out the present invention, the reasons for limiting the chemical components of the invention according to the claims of the present application will be described. In addition,% in the following each chemical component is mass%.
Ｃ：０．００３〜０．１２０％
Ｃは、請求項１〜４の発明に係るフェライト系ステンレス鋼において、強度を上げる元素であり、その効果を得るには０．００３％以上の添加が必要である。ところで、この請求項１〜４の鋼はフェライト系ステンレス鋼であるので、Ｃの含有量は比較的に低く、Ｃが０．１２０％を超えて含有されると、ギ酸が含まれる環境下では、耐食性が低下する。そこで、請求項１〜４のフェライト系ステンレス鋼では、Ｃは０．００３〜０．１２０％以下とする。
C: 0.003-0.120%
C is an element that increases the strength in the ferritic stainless steel according to the inventions of claims 1 to 4, and 0.003% or more is necessary to obtain the effect. By the way, since the steels of claims 1 to 4 are ferritic stainless steel, the content of C is relatively low, and if C is contained in an amount exceeding 0.120%, it is under an environment containing formic acid. Corrosion resistance is reduced. Therefore, in the ferritic stainless steel according to claims 1 to 4, C is made 0.003 to 0.120% or less.
Ｃ：０．０１０〜０．７５０％
Ｃは、請求項５〜８の発明に係るマルテンサイト系ステンレス鋼において、焼入焼戻し硬さおよび強度を確保して、自動車の燃料ポンプの部材や燃料の供給系の部品などの硬さと強度を保持するために必要な元素である。このために、Ｃは０．０１０％以上を必要とする。ところで、この請求項５〜８の鋼はマルテンサイト系ステンレス鋼であるので、Ｃの含有量はフェライト系ステンレス鋼よりも高いが、Ｃが０．７５０％を超えて鋼中に含有されると、ギ酸が含まれる環境下における耐食性が低下する。そこで、請求項５〜８のマルテンサイト系ステンレス鋼では、Ｃは０．０１０〜０．７５０％とする。
C: 0.010 to 0.750%
C, in the martensitic stainless steel according to the inventions of claims 5 to 8, secures the quenching and tempering hardness and strength, and provides the hardness and strength of automobile fuel pump members, fuel supply system components, and the like. It is an element necessary for holding. For this reason, C needs 0.010% or more. By the way, since the steels of claims 5 to 8 are martensitic stainless steel, the content of C is higher than that of ferritic stainless steel, but when C exceeds 0.750% and is contained in the steel. Corrosion resistance in an environment containing formic acid is reduced. Therefore, in the martensitic stainless steel according to claims 5 to 8, C is made 0.010 to 0.750%.
Ｓｉ：０．１０〜１．００％
Ｓｉは、フェライト系ステンレス鋼またはマルテンサイト系ステンレス鋼にかかわらず、脱酸元素であり、その効果を得るにはＳｉは０．１０％以上を必要とする。しかし、Ｓｉが１．００％を超えて含有されると、靱性が低下する。そこで、Ｓｉは０．１０〜１．００％とする。
Si: 0.10 to 1.00%
Si is a deoxidizing element regardless of whether it is ferritic stainless steel or martensitic stainless steel, and Si needs to be 0.10% or more to obtain the effect. However, if Si is contained in excess of 1.00%, the toughness decreases. Therefore, Si is set to 0.10 to 1.00%.
Ｍｎ：０．１０〜１．００％
Ｍｎは、フェライト系ステンレス鋼またはマルテンサイト系ステンレス鋼にかかわらず、脱酸元素であり、その効果を得るにはＭｎは０．１０％以上を必要とする。しかし、Ｍｎが１．００％より多く含有されると、耐食性が低下する。そこで、Ｍｎは０．１０〜１．００％とする。
Mn: 0.10 to 1.00%
Mn is a deoxidizing element regardless of whether it is ferritic stainless steel or martensitic stainless steel, and Mn needs to be 0.10% or more to obtain the effect. However, when Mn is contained more than 1.00%, the corrosion resistance is lowered. Therefore, Mn is set to 0.10 to 1.00%.
Ｐ：０．０４０％以下
Ｐは、フェライト系ステンレス鋼またはマルテンサイト系ステンレス鋼にかかわらず、不要な元素で、多く含有されると耐食性、熱間加工性を劣化させるため上限を０．０４０％とする。
P: 0.040% or less P is an unnecessary element regardless of whether it is ferritic stainless steel or martensitic stainless steel. If it is contained in a large amount, the corrosion resistance and hot workability deteriorate, so the upper limit is 0.040%. And
Ｓ：０．０３０％以下
Ｓは、フェライト系ステンレス鋼またはマルテンサイト系ステンレス鋼にかかわらず、不要な元素で、多く含有されると硫化物を形成して熱間加工性を低下させるため上限を０．０３０％とする。
S: 0.030% or less S is an unnecessary element regardless of whether it is ferritic stainless steel or martensitic stainless steel. If it is contained in a large amount, it forms sulfides and lowers the hot workability. 0.030%.
Ｃｒ：１１．００〜２４．００％
Ｃｒは、請求項１〜４の発明に係るフェライト系ステンレス鋼において、自動車の燃料ポンプの部材や燃料の供給系の部品などの耐食性を確保するために必要である。このために、Ｃｒは１１．００％以上を必要とする。しかし、Ｃｒが２４．００％より多く含有されると、靱性および加工性が低下する。請求項１〜４のフェライト系ステンレス鋼では、Ｃｒは１１．００〜２４．００％とする。
Cr: 11.00-24.00%
In the ferritic stainless steel according to the first to fourth aspects of the present invention, Cr is necessary for ensuring corrosion resistance of a fuel pump member of an automobile, a fuel supply system component, and the like. For this reason, Cr needs to be 11.00% or more. However, when Cr is contained more than 24.00%, toughness and workability are lowered. In the ferritic stainless steel according to claims 1 to 4, Cr is 11.00 to 24.00%.
Ｃｒ：１１．００〜１８．００％
Ｃｒは、請求項５〜８の発明に係るマルテンサイト系ステンレス鋼において、Ｃ量がフェライト系ステンレス鋼に比して多いので、焼入によりマルテンサイト組織となるものであるが、自動車の燃料ポンプの部材や燃料の供給系の部品などの耐食性を確保するために必要である。このために、Ｃｒは１１．００％以上を必要とする。しかし、Ｃｒが１８．００％より多く含有されると、靱性および加工性が低下する。請求項５〜８のマルテンサイトト系ステンレス鋼では、Ｃｒは１１．００〜１８．００％とする。
Cr: 11.00-18.00%
Since Cr is a martensitic stainless steel according to the inventions of claims 5 to 8 and has a larger amount of C than ferritic stainless steel, it becomes a martensitic structure by quenching. This is necessary to ensure the corrosion resistance of the members and the parts of the fuel supply system. For this reason, Cr needs to be 11.00% or more. However, when Cr is contained more than 18.00%, toughness and workability are deteriorated. In the martensitic stainless steel of claims 5 to 8, Cr is 11.00 to 18.00%.
Ｎｉ：２．００％以下
Ｎｉは、フェライト系ステンレス鋼またはマルテンサイト系ステンレス鋼にかかわらず、耐ギ酸性を改善する効果を有する。しかし、Ｎｉが２．００％より多いと熱間加工性を低下させる。そこで、Ｎｉは２．００％以下とする。
Ni: 2.00% or less Ni has an effect of improving forgi acid resistance irrespective of ferritic stainless steel or martensitic stainless steel. However, when Ni is more than 2.00%, hot workability is reduced. Therefore, Ni is made 2.00% or less.
Ｍｏ：３．００％以下
Ｍｏは、フェライト系ステンレス鋼またはマルテンサイト系ステンレス鋼にかかわらず、耐ギ酸性を改善する効果を有する。しかし、Ｍｏは高価な元素であり、Ｍｏが３．００％より多く含有されるとコスト増となる。そこで、Ｍｏは３．００％以下とする。
Mo: 3.00% or less Mo has an effect of improving forgi acid resistance regardless of ferritic stainless steel or martensitic stainless steel. However, Mo is an expensive element, and if the Mo content exceeds 3.00%, the cost increases. Therefore, Mo is set to 3.00% or less.
Ｃｕ：０．１０〜２．００％
Ｃｕは、フェライト系ステンレス鋼またはマルテンサイト系ステンレス鋼にかかわらず、耐ギ酸性の耐食性の確保に必要な元素である。そのためには、Ｃｕは０．１０％以上を必要とする。しかし、Ｃｕが２．００％より多く含有されると熱間加工性が低下する。そこで、Ｃｕは０．１０〜２．００％とする。
Cu: 0.10 to 2.00%
Cu is an element necessary for ensuring forgi-acidic corrosion resistance regardless of ferritic stainless steel or martensitic stainless steel. For that purpose, Cu needs to be 0.10% or more. However, when Cu is contained more than 2.00%, hot workability is lowered. Therefore, Cu is made 0.10 to 2.00%.
Ｎ：０．０１〜０．１０％
Ｎは、フェライト系ステンレス鋼またはマルテンサイト系ステンレス鋼にかかわらず、強度を上げる元素である。そのためには、Ｎは０．０１％以上を必要とする。しかし、Ｎが０．１０％を超えて含有されると窒化物を多量に生じ靭性が低下する。そこで、Ｎは０．０１〜０．１０％とする。
N: 0.01-0.10%
N is an element that increases the strength regardless of ferritic stainless steel or martensitic stainless steel. For that purpose, N needs to be 0.01% or more. However, if N exceeds 0.10%, a large amount of nitride is produced and the toughness is lowered. Therefore, N is set to 0.01 to 0.10%.
Ｔｉ：０．１０〜２．００％、Ｎｂ：０．１０〜２．００％、Ｖ：０．１０〜２．００％、Ｔａ：０．１０〜２．００％、Ｚｒ：０．１０〜２．００％のうちのいずれか１種は０．１０〜２．００％または２種以上は０．１０〜２．００％
Ｔｉ、Ｎｂ、Ｖ、Ｔａ、Ｚｒの元素は、１種または２種以上が選択的に含有される元素である。ところで、これらの元素の１種の量が０．１０％以上あるいはこれらの元素の２種以上の量が０．１０％以上含有されると、それらの元素の炭化物が形成されて耐食性が改善される。しかし、これらの元素の１種の量が２．００％を超えるとあるいはこれらの元素の２種以上の量が２．００％を超えると熱間加工性が低下する。そこで、Ｔｉが０．１０〜２．００％、Ｎｂが０．１０〜２．００％、Ｖが０．１０〜２．００％、Ｔａが０．１０〜２．００％、Ｚｒが０．１０〜２．００％で、これらのうちのいずれか１種は０．１０〜２．００％または２種以上は０．１０〜２．００％とする。
Ti: 0.10 to 2.00%, Nb: 0.10 to 2.00%, V: 0.10 to 2.00%, Ta: 0.10 to 2.00%, Zr: 0.10 Any one of 2.00% is 0.10 to 2.00% or two or more is 0.10 to 2.00%
The elements of Ti, Nb, V, Ta, and Zr are elements in which one or more elements are selectively contained. By the way, if the amount of one of these elements is 0.10% or more, or the amount of two or more of these elements is 0.10% or more, carbides of these elements are formed and the corrosion resistance is improved. The However, when the amount of one of these elements exceeds 2.00%, or when the amount of two or more of these elements exceeds 2.00%, hot workability deteriorates. Therefore, Ti is 0.10 to 2.00%, Nb is 0.10 to 2.00%, V is 0.10 to 2.00%, Ta is 0.10 to 2.00%, and Zr is 0.00. 10 to 2.00%, and any one of these is 0.10 to 2.00%, or two or more is 0.10 to 2.00%.
Ｂ：０．００１〜０．０１０％
Ｂは、熱間加工性に必要な元素である。このためには、Ｂは０．００１％以上を必要とする。Ｂが０．０１０％を超えると熱間加工性は逆に低下する。そこで、Ｂは０．００１〜０．０１０％とする。
B: 0.001 to 0.010%
B is an element necessary for hot workability. For this purpose, B needs to be 0.001% or more. On the other hand, when B exceeds 0.010%, the hot workability decreases. Therefore, B is made 0.001 to 0.010%.
（Ｃｒ＋１．５Ｍｏ）×３．０Ｃは８．５０以下
請求項１〜４の発明に係るフェライト系ステンレス鋼において、Ｃｕを添加し、耐ギ酸性を向上させた場合においても、クロム炭化物が多量に存在するとギ酸環境ではクロム炭化物を起点として腐食が進行することがある。そこで、Ｃｒ、ＭｏおよびＣ量を適正化させ、クロム炭化物の析出を制限する必要がある。すなわち、（Ｃｒ＋１．５Ｍｏ）×３．０Ｃは８．５０以下とする。
(Cr + 1.5Mo) × 3.0C is 8.50 or less In the ferritic stainless steel according to the inventions of claims 1 to 4, even when Cu is added to improve anti-acidity, a large amount of chromium carbide is present. When present, corrosion may proceed starting from chromium carbide in a formic acid environment. Therefore, it is necessary to optimize the amounts of Cr, Mo, and C and limit the precipitation of chromium carbide. That is, (Cr + 1.5Mo) × 3.0C is 8.50 or less.
（Ｃｒ＋１．５Ｍｏ）×Ｃは８．５０以下
請求項５〜８の発明に係るマルテンサイト系ステンレス鋼において、Ｃｕを添加し、耐ギ酸性を向上させた場合においても、クロム炭化物が多量に存在するとギ酸環境ではクロム炭化物を起点として腐食が進行することがあり、Ｃｒ、ＭｏおよびＣ量を適正化させ、クロム炭化物の析出を制限する必要がある。すなわち、（Ｃｒ＋１．５Ｍｏ）×Ｃは８．５０以下とする。
(Cr + 1.5Mo) × C is 8.50 or less In the martensitic stainless steel according to the inventions of claims 5 to 8, even when Cu is added to improve anti-acidity, a large amount of chromium carbide exists. Then, in a formic acid environment, corrosion may proceed starting from chromium carbide, and it is necessary to optimize the amounts of Cr, Mo and C and to limit precipitation of chromium carbide. That is, (Cr + 1.5Mo) × C is 8.50 or less.
５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕは１３６以上
Ｎｉ、Ｃｒ、Ｍｏ、Ｃｕは、添加量を適正化することでギ酸環境における腐食速度を抑制し、耐ギ酸性を向上させる。そこで、このためには、５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕは１３６以上とする。
58Ni + Cr + 92Mo + 259Cu is 136 or more Ni, Cr, Mo, Cu suppresses the corrosion rate in the formic acid environment by optimizing the amount of addition, and improves the acid resistance. Therefore, for this purpose, 58Ni + Cr + 92Mo + 259Cu is set to 136 or more.
本願の発明の実施の形態について以下に記載する。
先ず、本願の発明の各請求項の化学成分を有する鋼を溶製する。この場合、表１に記載するＮｏ．１〜２０のフェライト系ステンレス鋼である発明鋼およびＮｏ．２１〜２３のフェライト系ステンレス鋼である比較鋼について、それぞれ１００ｋｇを真空誘導溶解法（ＶＩＭ法）により溶製した鋼を１０５０℃に加熱して直径２０ｍｍの棒鋼に鍛伸し、次いで８００℃に焼なまして徐冷を行った。
Embodiments of the present invention will be described below.
First, steel having chemical components according to the claims of the present invention is melted. In this case, no. Invention steels No. 1-20 ferritic stainless steel and No. 1-20 About the comparative steels which are ferritic stainless steels 21 to 23, each 100 kg of steel produced by vacuum induction melting method (VIM method) is heated to 1050 ° C. and forged into a steel bar having a diameter of 20 mm, and then heated to 800 ° C. Slow cooling was performed after annealing.
さらに、表２に記載するＮｏ．２４〜４６のマルテンサイト系ステンレス鋼である発明鋼およびＮｏ．４７〜４９のマルテンサイト系ステンレス鋼である比較鋼について、それぞれ１００ｋｇを真空誘導溶解法（ＶＩＭ法）により溶製した鋼を１１５０℃に加熱して直径２０ｍｍの棒鋼に鍛伸し、次いで１０３０℃から油冷により焼入し、１８０℃に焼戻して空冷した。 Furthermore, No. 1 described in Table 2 was used. Invention steels No. 24 to 46 martensitic stainless steel and No. About the comparative steel which is a martensitic stainless steel of 47-49, the steel which melt | dissolved 100kg by the vacuum induction melting method (VIM method) is heated at 1150 degreeC, and it forges to a bar steel with a diameter of 20 mm, and then 1030 degreeC Then, it was quenched by oil cooling, tempered to 180 ° C. and air-cooled.
Ｎｏ．１〜２０のフェライト系ステンレス鋼である発明鋼およびＮｏ．２１〜２３のフェライト系ステンレス鋼である比較鋼、並びにＮｏ．２４〜４６のマルテンサイト系ステンレス鋼である発明鋼およびＮｏ．４７〜４９のマルテンサイト系ステンレス鋼である比較鋼について、これらを２５℃の５％ギ酸溶液に２４時間浸漬してその腐食度を試験し、その結果を表３に示す。ギ酸に対する腐食度が１時間当たり７．００ｇ／ｍｍ2以下であれば、評価を良好であることを示して○とした。一方、ギ酸に対する腐食度が１時間当たり７．００ｇ／ｍｍ2を超えるものは、評価を不可であることを示す×とした。 No. Invention steels No. 1-20 ferritic stainless steel and No. 1-20 Comparative steels that are ferritic stainless steels Nos. 21 to 23, and Invention steels No. 24 to 46 martensitic stainless steel and No. About the comparative steel which is a martensitic stainless steel of 47-49, these were immersed in the 5% formic acid solution of 25 degreeC for 24 hours, the corrosion degree was tested, and the result is shown in Table 3. If the degree of corrosion with respect to formic acid is 7.00 g / mm 2 or less per hour, the evaluation is good and the result is ◯. On the other hand, when the corrosion degree with respect to formic acid exceeded 7.00 g / mm 2 per hour, it was evaluated as x indicating that the evaluation was impossible.
上記の耐ギ酸浸漬試験の結果、本願の各請求項に係る発明鋼である、フェライト系ステンレス鋼であるＮｏ．１〜２０において、表１における（Ｃｒ＋１．５Ｍｏ）×３．０Ｃの耐ギ酸性の低下を示す上限値は８．５０以下であり、また、マルテンサイト系ステンレス鋼であるＮｏ．２４〜４６において、表２における（Ｃｒ＋１．５Ｍｏ）×Ｃの耐ギ酸性の低下を示す上限値は８．５０以下であり、５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕの耐ギ酸性を確保する値は１３６以上であった。したがって、これらの本願の発明鋼であるＮｏ．１〜２０のフェライト系ステンレス鋼およびＮｏ．２４〜４６のマルテンサイト系ステンレス鋼は、いずれも耐ギ酸性である耐食性が良好であった。すなわち、これらの発明鋼は、劣化ガソリンが存在する自動車の燃料ポンプ部材や燃焼供給系の部品などとして使用されるとき、優れた耐食性が示された。 As a result of the above-mentioned formic acid immersion test, No. 1 is a ferritic stainless steel, which is the invention steel according to each claim of the present application. 1 to 20, in Table 1, the upper limit value indicating the decrease in the resistance to formic acid of (Cr + 1.5Mo) × 3.0C is 8.50 or less, and No. 1 is a martensitic stainless steel. 24 to 46, the upper limit value indicating the decrease in the resistance to (Cr + 1.5Mo) × C in Table 2 was 8.50 or less, and the value for ensuring the resistance to 58Ni + Cr + 92Mo + 259Cu was 136 or more. Therefore, these invention steels of the present application No. 1-20 ferritic stainless steel and All of the martensitic stainless steels of 24-46 had good anti-corrosion properties that were formic acid resistant. In other words, these invention steels showed excellent corrosion resistance when used as fuel pump members of automobiles with deteriorated gasoline or parts of combustion supply systems.
これに対して、フェライト系ステンレス鋼である比較鋼のＮｏ．２１〜２２は、表１における（Ｃｒ＋１．５Ｍｏ）×３．０Ｃの耐ギ酸性の低下を示す上限値の８．５０以下であったが、５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕの耐ギ酸性を確保する値は、Ｎｏ．２１では２０、Ｎｏ．２２では１３２で共に１３６未満であり、耐ギ酸性が確保できず腐食度が７．００ｇ／ｍｍ2を超え不合格となった。また、Ｎｏ．２３では５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕの耐ギ酸性を確保する下限値の１３６以上であったが、（Ｃｒ＋１．５Ｍｏ）×３．０Ｃの耐ギ酸性の低下を示す値は、８．７５と上限値の８．５０を超えており、耐ギ酸性が低下し腐食度が７．００ｇ／ｍｍ2を超え不合格となった。 On the other hand, No. of comparative steel which is ferritic stainless steel. 21 to 22 were 8.50 or less of the upper limit value indicating a decrease in the resistance to (Cr + 1.5Mo) × 3.0C in Table 1. The value for ensuring the resistance to 58Ni + Cr + 92Mo + 259Cu was No. 21-22. 21 is 20, no. No. 22 was less than 136 for both 132, and the resistance to forearic acid could not be ensured, and the corrosion degree exceeded 7.00 g / mm 2 , resulting in failure. No. 23, which was 136 or more as the lower limit value for securing the resistance to 58Ni + Cr + 92Mo + 259Cu, the value indicating the decrease in the resistance to (Cr + 1.5Mo) × 3.0C is 8.75, which is the upper limit value of 8.50. The acidity resistance decreased and the corrosion degree exceeded 7.00 g / mm 2 , resulting in a failure.
さらに、マルテンサイト系ステンレス鋼である比較鋼のＮｏ．４７〜４８は、表２における（Ｃｒ＋１．５Ｍｏ）×Ｃの耐ギ酸性の低下を示す上限値の８．５０以下であったが、５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕの耐ギ酸性を確保する値は、Ｎｏ．４７では１６、Ｎｏ．２２では１３１で共に１３６未満であり、耐ギ酸性が確保できず腐食度が７．００ｇ／ｍｍ2を超え不合格となった。また、Ｎｏ．４９では５８Ｎｉ＋Ｃｒ＋９２Ｍｏ＋２５９Ｃｕの耐ギ酸性を確保する下限値の１３６以上であったが、（Ｃｒ＋１．５Ｍｏ）×３．０Ｃの耐ギ酸性の低下を示す値は、８．７９と上限値の８．５０を超えており、耐ギ酸性が低下し腐食度が７．００ｇ／ｍｍ2を超え不合格となった。 Furthermore, No. of comparative steel which is martensitic stainless steel. 47 to 48 were 8.50 or less of the upper limit value indicating a decrease in the resistance to (Cr + 1.5Mo) × C in Table 2, but the value for ensuring the resistance to 58Ni + Cr + 92Mo + 259Cu was No. 47-48. 47, No. 16 No. 22 was less than 136 for both 131, and the acidity resistance could not be ensured, and the corrosion degree exceeded 7.00 g / mm 2 , which was unacceptable. No. 49, the lower limit of 136 to ensure the resistance to 58Ni + Cr + 92Mo + 259Cu is 136 or more, but the value indicating the decrease in the resistance to (Cr + 1.5Mo) × 3.0C is 8.79, the upper limit of 8.50. The acidity resistance decreased and the corrosion degree exceeded 7.00 g / mm 2 , resulting in a failure.
結局、比較鋼は、フェライト系ステンレス鋼であってもマルテンサイト系ステンレス鋼であっても、表１と表２に示す全てのＮｏ．２１〜２３、Ｎｏ．４７〜４９が、耐ギ酸性の低下または耐ギ酸性の確保のいずれかで、本願の請求項に係る発明を満足するものではなかった。 As a result, the comparative steels are all ferritic stainless steels and martensitic stainless steels. 21-23, no. 47 to 49 did not satisfy the invention according to the claims of the present application, either due to a decrease in acid resistance or to ensure the acid resistance.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014174619A JP6452351B2 (en) | 2014-08-28 | 2014-08-28 | Stainless steel with excellent acid resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014174619A JP6452351B2 (en) | 2014-08-28 | 2014-08-28 | Stainless steel with excellent acid resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2016050320A true JP2016050320A (en) | 2016-04-11 |
| JP6452351B2 JP6452351B2 (en) | 2019-01-16 |
Family
ID=55658057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2014174619A Active JP6452351B2 (en) | 2014-08-28 | 2014-08-28 | Stainless steel with excellent acid resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6452351B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018197391A (en) * | 2017-05-24 | 2018-12-13 | 大同特殊鋼株式会社 | Ferritic stainless steel for plating bath |
| KR20220097991A (en) | 2019-12-19 | 2022-07-08 | 닛테츠 스테인레스 가부시키가이샤 | Martensitic stainless steel for high hardness and corrosion resistance with excellent cold workability and manufacturing method therefor |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141545A (en) * | 1979-04-21 | 1980-11-05 | Nippon Steel Corp | Highly corrosion resistant ferrite stainless steel |
| JPH03277761A (en) * | 1990-03-27 | 1991-12-09 | Nippon Steel Corp | Aluminized steel sheet for engine exhaust gas system material excellent in corrosion resistance |
| JPH0658218A (en) * | 1992-08-10 | 1994-03-01 | Hitachi Ltd | Highly corrosion-resistant fuel injection device |
| JPH1025550A (en) * | 1996-07-15 | 1998-01-27 | Daido Steel Co Ltd | Corrosion resistant steel |
| JPH10102208A (en) * | 1996-09-25 | 1998-04-21 | Kawasaki Steel Corp | Ferritic stainless steel for engine exhaust member, excellent in heat resistance, workability, and corrosion resistance in weld zone |
| JP2002363711A (en) * | 2000-08-07 | 2002-12-18 | Nippon Steel Corp | Ferritic stainless steel sheet for fuel tank |
| JP2003221660A (en) * | 2002-01-31 | 2003-08-08 | Nisshin Steel Co Ltd | Fuel tank for vehicle made from hot-dip aluminized stainless steel sheet |
| JP2005344184A (en) * | 2004-06-04 | 2005-12-15 | Daido Steel Co Ltd | Martensitic stainless steel |
| JP2007092163A (en) * | 2005-09-02 | 2007-04-12 | Nisshin Steel Co Ltd | Automobile exhaust gas flow passage member |
| JP2009197293A (en) * | 2008-02-23 | 2009-09-03 | Nisshin Steel Co Ltd | Ferritic stainless steel material, manufacturing method therefor, and automotive muffler |
| JP2010174334A (en) * | 2009-01-29 | 2010-08-12 | Daido Steel Co Ltd | Duplex stainless steel, and steel material and steel product using the same |
-
2014
- 2014-08-28 JP JP2014174619A patent/JP6452351B2/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141545A (en) * | 1979-04-21 | 1980-11-05 | Nippon Steel Corp | Highly corrosion resistant ferrite stainless steel |
| JPH03277761A (en) * | 1990-03-27 | 1991-12-09 | Nippon Steel Corp | Aluminized steel sheet for engine exhaust gas system material excellent in corrosion resistance |
| JPH0658218A (en) * | 1992-08-10 | 1994-03-01 | Hitachi Ltd | Highly corrosion-resistant fuel injection device |
| JPH1025550A (en) * | 1996-07-15 | 1998-01-27 | Daido Steel Co Ltd | Corrosion resistant steel |
| JPH10102208A (en) * | 1996-09-25 | 1998-04-21 | Kawasaki Steel Corp | Ferritic stainless steel for engine exhaust member, excellent in heat resistance, workability, and corrosion resistance in weld zone |
| JP2002363711A (en) * | 2000-08-07 | 2002-12-18 | Nippon Steel Corp | Ferritic stainless steel sheet for fuel tank |
| JP2003221660A (en) * | 2002-01-31 | 2003-08-08 | Nisshin Steel Co Ltd | Fuel tank for vehicle made from hot-dip aluminized stainless steel sheet |
| JP2005344184A (en) * | 2004-06-04 | 2005-12-15 | Daido Steel Co Ltd | Martensitic stainless steel |
| JP2007092163A (en) * | 2005-09-02 | 2007-04-12 | Nisshin Steel Co Ltd | Automobile exhaust gas flow passage member |
| JP2009197293A (en) * | 2008-02-23 | 2009-09-03 | Nisshin Steel Co Ltd | Ferritic stainless steel material, manufacturing method therefor, and automotive muffler |
| JP2010174334A (en) * | 2009-01-29 | 2010-08-12 | Daido Steel Co Ltd | Duplex stainless steel, and steel material and steel product using the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018197391A (en) * | 2017-05-24 | 2018-12-13 | 大同特殊鋼株式会社 | Ferritic stainless steel for plating bath |
| KR20220097991A (en) | 2019-12-19 | 2022-07-08 | 닛테츠 스테인레스 가부시키가이샤 | Martensitic stainless steel for high hardness and corrosion resistance with excellent cold workability and manufacturing method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6452351B2 (en) | 2019-01-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4381355B2 (en) | Steel having excellent delayed fracture resistance and tensile strength of 1600 MPa class or more and method for producing the molded product thereof | |
| KR101619008B1 (en) | Heat-resistant austenitic stainless steel sheet | |
| EP2692889A1 (en) | Ferritic stainless steel sheet having excellent heat resistance and processability, and method for producing same | |
| US20130294959A1 (en) | Heat-resistant steel | |
| CN113186468B (en) | High-durability petroleum cracking pipe steel and heat treatment method and production method thereof | |
| JPWO2014157576A1 (en) | Ferritic stainless hot-rolled steel sheet, manufacturing method thereof, and steel strip | |
| JP6680142B2 (en) | High-strength seamless oil country tubular good and method for manufacturing the same | |
| JP5137934B2 (en) | Ferritic heat resistant steel | |
| JPWO2012121232A1 (en) | Duplex stainless steel | |
| JP6789693B2 (en) | High-strength spring steel with excellent corrosion resistance | |
| KR101745191B1 (en) | Ultra high strength spring steel | |
| JP6452351B2 (en) | Stainless steel with excellent acid resistance | |
| KR20150074697A (en) | Low-nickel containing stainless steels | |
| CN101684540B (en) | Martensitic stainless steel with high Mn content | |
| JP2016027204A (en) | Age-hardening bainite untempered steel | |
| JP6296435B2 (en) | Manufacturing method of heat-resistant austenitic stainless steel for metal gasket | |
| JP6583885B2 (en) | High hardness stainless steel with excellent corrosion resistance and manufacturability | |
| JP5793556B2 (en) | 862 MPa class low C high Cr steel pipe having high corrosion resistance and manufacturing method thereof | |
| JP2020041186A (en) | Case hardened steel for gas carburization, and gas carburization | |
| JP6587881B2 (en) | Ferritic stainless steel wire for fastening parts | |
| JP2013072104A (en) | Steel excellent in toughness and wear resistance | |
| JP6987651B2 (en) | High hardness precipitation hardening stainless steel with excellent hot workability and no sub-zero treatment required | |
| JP6201731B2 (en) | Austenitic heat-resistant casting alloy | |
| JP5783805B2 (en) | Steel with excellent fatigue properties and toughness | |
| JP6365963B2 (en) | Martensitic stainless steel for fuel injection member and fuel injection member using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20170721 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20180409 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20180424 |
|
| A601 | Written request for extension of time |
Free format text: JAPANESE INTERMEDIATE CODE: A601 Effective date: 20180622 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20180726 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20180925 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20181109 |
|
| A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20181119 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20181211 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20181211 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 6452351 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |