JPH02185947A - Cast iron excellent in weatherability - Google Patents
Cast iron excellent in weatherabilityInfo
- Publication number
- JPH02185947A JPH02185947A JP363589A JP363589A JPH02185947A JP H02185947 A JPH02185947 A JP H02185947A JP 363589 A JP363589 A JP 363589A JP 363589 A JP363589 A JP 363589A JP H02185947 A JPH02185947 A JP H02185947A
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- castability
- weather
- weatherability
- workability
- 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
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 150000001247 metal acetylides Chemical class 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 15
- 229910052804 chromium Inorganic materials 0.000 abstract description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 9
- 238000005275 alloying Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 5
- 229910001060 Gray iron Inorganic materials 0.000 abstract description 4
- 229910052759 nickel Inorganic materials 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 238000010348 incorporation Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 18
- 238000005260 corrosion Methods 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910000870 Weathering steel Inorganic materials 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004453 electron probe microanalysis Methods 0.000 description 2
- 238000005087 graphitization Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 206010067482 No adverse event Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- VAKIVKMUBMZANL-UHFFFAOYSA-N iron phosphide Chemical compound P.[Fe].[Fe].[Fe] VAKIVKMUBMZANL-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 235000011835 quiches Nutrition 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Landscapes
- Steps, Ramps, And Handrails (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は建築用、構造・意匠部材用の鋳鉄に係わり、特
に大気中での耐候性に優れた鋳鉄に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to cast iron for use in architecture and structural/design components, and particularly to cast iron that has excellent weather resistance in the atmosphere.
〈従来の技術〉
周知のように耐食性鋳鉄にはＳｌを４〜１５％含有させ
た高Ｓｉ鋳鉄、 Ｎｉを１２〜２５％含有させたニレジ
スト鋳鉄、 Ｃｒを１０〜３５％含有させた高Ｃｒ鋳鉄
（例えば鋳物便覧１日本鋳物協会編）等優れた耐食性を
存する材料が既に存在するが、高Ｓｉ鋳鉄は機械的性質
が脆弱で硬いため、建築部材には不適で機械加工も困難
である。ニレジスト鋳鉄はＮｆを多聞に含有しておりａ
械的性質に優れるが高価である。<Prior art> As is well known, corrosion-resistant cast iron includes high Si cast iron containing 4 to 15% Sl, Niresist cast iron containing 12 to 25% Ni, and high Cr cast iron containing 10 to 35% Cr. (For example, Foundry Handbook 1, edited by the Japan Foundry Association), there are already materials that have excellent corrosion resistance, but high-Si cast iron has brittle and hard mechanical properties, making it unsuitable for building materials and difficult to machine. Niresist cast iron contains a large amount of Nf.
It has excellent mechanical properties but is expensive.
高Ｃｒ鋳鉄はステンレス鋼に近い耐食性を有するが非常
に硬く、靭性も低い等、それぞれ扱い難い欠点を持って
おり、それらは一般に特殊な用途で使用される工業部材
として用いられているに過ぎない。High Cr cast iron has corrosion resistance close to that of stainless steel, but each has drawbacks that make it difficult to handle, such as being extremely hard and having low toughness, so they are generally only used as industrial parts for special purposes. .
このように従来の耐食性鋳鉄はコスト、加工性材質等の
点から建築用部材として使用することは不適であった。As described above, conventional corrosion-resistant cast iron has been unsuitable for use as construction materials due to cost, workability, and other considerations.
一方、鋼材の範噴においては廉価で耐食性（耐候性）に
優れた構造部材として耐候性鋼が公知であるが、これは
一般に圧延鋼材であり、意匠部材としてのデザイン性は
低い、また、これを鋳鋼として所定の形状に鋳造する事
例もみられるが（例えば橋染と基礎、 ８１−３．Ｐ４
Ｑ〜）これらの耐候性鋳鋼は鋳造性が悪く、複雑な意匠
模様や形状の再現性に乏しいこと、！２造コストが１Ｍ
鉄鋳物に比べて高いこと等、建築用意匠部材としての応
用性に欠けるものであった。On the other hand, in the field of steel materials, weathering steel is well known as a structural member that is inexpensive and has excellent corrosion resistance (weather resistance), but this is generally rolled steel and has low designability as a decorative member. There are also cases where steel is cast into a predetermined shape (for example, hashizome and foundation, 81-3.P4
Q~) These weather-resistant cast steels have poor castability and poor reproducibility of complex designs and shapes! 2 construction cost is 1M
It lacked applicability as an architectural design component due to its high cost compared to iron castings.
〈発明が解決しようとする課題〉
本発明の目的は、上述のような観点から建築用構造・意
匠部材として、耐候性と加工性に優れた廉価で鋳造性の
良い鋳鉄を提供しようとするものであり、特に複９ｆｌ
な形伏、模様をＹＦシた意匠部材として応用性の高い耐
候性鋳鉄を提供するものである。<Problems to be Solved by the Invention> From the above-mentioned viewpoints, the purpose of the present invention is to provide cast iron that is inexpensive, has excellent weather resistance and workability, and has good castability as a structural/design member for construction. Especially for double 9fl
The present invention provides weather-resistant cast iron with a YF shape and pattern that is highly applicable as a design member.
〈課題解決のための手段〉
本発明の鋳鉄は、その材質において、鋳造性及び加工性
に優れた鋳鉄組成を基本とし、微盪の合金元素を配合す
ることによって、大気中で形成される錆層の耐候性を向
上させたものである。<Means for Solving the Problems> The cast iron of the present invention is based on a cast iron composition with excellent castability and workability, and by adding a small amount of alloying elements, the cast iron is made of a cast iron composition that is excellent in castability and workability. This layer has improved weather resistance.
すなわち、本発明は炭素飽和度ｉｓｃ ＝Ｃ％／（４，
２３−Ｓｔ％／３．２）ｌが０．８〜１．１で、Ｃ：２
．８〜３．６％、 Ｓｉ ： １．６〜３．２％、 Ｍ
ｎ ： ０．２〜１．０％Ｓ ： ０．００３〜０．
０３０％、 Ｐ ：０．０５〜０．５％、Ｃｒ：０．
１〜１．０％、 Ｃｕ：０．３〜２．０％、 Ｎｉ：０
．１〜２．０％。That is, in the present invention, the carbon saturation isc =C%/(4,
23-St%/3.2) l is 0.8 to 1.1, C: 2
．． 8-3.6%, Si: 1.6-3.2%, M
n: 0.2-1.0% S: 0.003-0.
030%, P: 0.05-0.5%, Cr: 0.030%, P: 0.05-0.5%, Cr: 0.
1-1.0%, Cu: 0.3-2.0%, Ni: 0
．． 1-2.0%.
Ｃａ：０．００１〜０．００５％をそれぞれ重量％で含
有し、残部ｒｅ及び不可避的不純物からなり、望ましく
はその金属組織に含まれる炭化物の面積率が５％以下で
あることを特徴とする耐候性に優れた鋳鉄である。Ca: 0.001 to 0.005% by weight, with the remainder consisting of re and inevitable impurities, and preferably the area ratio of carbides contained in the metal structure is 5% or less It is cast iron with excellent weather resistance.
く作 用〉
次に、まず本発明の耐候性鋳鉄の構成成分範囲の限定理
由について述べる。Function> Next, the reasons for limiting the range of constituent components of the weather-resistant cast iron of the present invention will be described first.
Ｃ，Ｓｔ ； Ｃ，Ｓｉは鋳鉄における基本元素であり
、鋳鉄の性状やｔＪｆ造性に影響を及ばず。本発明の鋳
鉄の場合、炭素飽和度（Ｓｃ ＝Ｃ％／ （４，２３Ｓ
ｉ％／３．２） ｌが０．８〜１．１の範囲で鋳造性と
黒鉛形状の良好なねずみ鋳鉄が得られる。すなわちＳｃ
〈０．８では白銑化する傾向が高くなり材質を硬く脆く
する。またＳｃ ＞１．１になると黒鉛量が過多になる
ばかりでなく、大型のキッシュ黒鉛を生成し、機械的性
質を劣化させる。ここでＳｉｉは少ないと鋳造性と黒鉛
化傾向を劣化させ、多いと硬く脆いシリコフェライトを
形成するようになるため１．６〜３．２％の範囲に限定
した。またＣ掛はＳｉとの関係から２．８〜３．６％に
限定した。C, St; C, Si are basic elements in cast iron, and do not affect the properties or tJf formability of cast iron. In the case of the cast iron of the present invention, carbon saturation (Sc = C%/ (4,23S
i%/3.2) Gray cast iron with good castability and graphite shape can be obtained when l is in the range of 0.8 to 1.1. That is, Sc
<0.8 has a high tendency to become white, making the material hard and brittle. Furthermore, when Sc >1.1, not only does the amount of graphite become excessive, but also large quiche graphite is produced, which deteriorates mechanical properties. Here, Sii is limited to a range of 1.6 to 3.2% because if it is too small, the castability and graphitization tendency will deteriorate, and if it is too large, hard and brittle silicoferrite will be formed. Further, the C ratio was limited to 2.8 to 3.6% due to its relationship with Si.
Ｓ；Ｓは耐候性に有害であると共に鋳鉄の白銑化傾向を
増す作用があり極力低減することが望まれる。好ましく
は上限を０．０１５％以下に押えるべきであるが ０．
０３％までの含有量ならば使用に差し支えない、一方下
限はコストＵＰを防止するため一般の熔解法で実現可能
な範囲の０．００３％とした。S: S is harmful to weather resistance and has the effect of increasing the tendency of cast iron to become white, so it is desirable to reduce it as much as possible. Preferably, the upper limit should be kept below 0.015%, but 0.
If the content is up to 0.03%, it can be used without any problem, but the lower limit was set at 0.003%, which is within the range that can be realized by a general melting method, in order to prevent cost increases.
Ｈｎ、 Ｃａ ； Ｍｎは鋳鉄中のＳの影響を中和する
作用を持つが０．２％以上含有しないとその効果は低い
。Hn, Ca; Mn has the effect of neutralizing the influence of S in cast iron, but its effect is low unless it is contained at 0.2% or more.
逆に１．０％を超えて含有させても効果が向上しないば
かりか白銑化を促進するようになる。そこでＭｎの含有
量は０．２〜１．０％に限定した。ＣａはＭｎと同様に
Ｓを中和する作用を有し、更に脱酸作用も持つため黒鉛
化を促進し、良好なねずみ鋳鉄とする効果がある。この
場合、Ｃａの含有量が０．００１％未満では効果が低く
、逆に０．ｏｏｓ％を超えて含有させても効果が向上し
ないため成分範囲を限定した。On the other hand, if the content exceeds 1.0%, not only the effect will not be improved but also whitening will be promoted. Therefore, the Mn content was limited to 0.2 to 1.0%. Like Mn, Ca has the effect of neutralizing S, and also has a deoxidizing effect, so it promotes graphitization and has the effect of producing good gray cast iron. In this case, if the Ca content is less than 0.001%, the effect will be low; The range of ingredients was limited because the effect would not improve even if the content exceeded oos%.
ＦＤＰは鋳鉄の耐候性向上に有用な元素であり第１図に
示す様に０．０５％からその効果が認められる。またＰ
は溶湯の流動性を向上させる効果が有り意匠部材用鋳鉄
としても有用な元素である。但し０．５％を超えて含有
させるとリン化鉄の生成量が非常に多くなり材質を硬く
脆弱にするため成分範囲を０．０５〜０．５％に限定し
た。FDP is an element useful for improving the weather resistance of cast iron, and its effect is recognized from 0.05% as shown in FIG. Also P
is an element that has the effect of improving the fluidity of molten metal and is also useful as cast iron for decorative parts. However, if the content exceeds 0.5%, the amount of iron phosphide produced will be extremely large, making the material hard and brittle, so the range of the components was limited to 0.05 to 0.5%.
Ｃｕ ； Ｃｕは鋳鉄の耐候性向上に極めて重要な元素
である。第２図に示すように０．２％以上含有させるこ
とによって耐候性が向上する。一方、２％を超えて添加
してもそれ以上の効果が得られず偏析の傾向が高くなる
ため好ましくない、そこでＣｕの成分範囲は０．２〜２
．０％に限定した。Cu: Cu is an extremely important element for improving the weather resistance of cast iron. As shown in FIG. 2, weather resistance is improved by containing 0.2% or more. On the other hand, it is not preferable to add more than 2% of Cu because no further effect can be obtained and the tendency of segregation increases, so the content range of Cu is 0.2~2%
．． It was limited to 0%.
Ｎ１ＨＮｉはＣｒの偏析を減すると共に錆層を安定にす
る作用が有る。多量に添加しても悪影響を及ぼすことは
ないがコストアップを防止するため上限を２．０％に定
めた。一方Ｎｊの効果は０．１％以上添加しないと得ら
れないことから下限を０．１％に定めた。N1HNi has the effect of reducing Cr segregation and stabilizing the rust layer. Even if added in large amounts, there will be no adverse effects, but the upper limit was set at 2.0% to prevent cost increases. On the other hand, since the effect of Nj cannot be obtained unless it is added in an amount of 0.1% or more, the lower limit was set at 0.1%.
Ｃｒ ； Ｃｒは単独添加した場合には耐候性にあまり
効果はないが、Ｐ、Ｃｕ、旧と複合添加した場合には０
．１％以上から効果を示すようになる。一方、１．０％
を超えて添加すると白銑化傾向を著しく増大し、大量の
炭化物を形成するようになるためＣｒ含有量は０．１〜
１．０％に限定した。Cr: Cr does not have much effect on weather resistance when added alone, but when added in combination with P, Cu, and Cr, it has no effect on weather resistance.
．． Effectiveness begins to be seen at 1% or more. On the other hand, 1.0%
If the Cr content is added in excess of 0.1 to
It was limited to 1.0%.
以上のような成分範囲に調整して鋳造された本発明の耐
候性鋳鉄は、大気暴露によって早くて２〜３年、遅くと
も５年のうちには、黒褐色を呈した錆を形成するように
なる。この錆層には、Ｃｕ。The weather-resistant cast iron of the present invention, which is cast with the above-mentioned composition ranges adjusted, begins to form dark brown rust within 2 to 3 years at the earliest, and within 5 years at the latest due to exposure to the atmosphere. This rust layer contains Cu.
Ｐ、Ｃｒが濃縮された緻密で安定な層が存在し、これが
鋳鉄の保護膜となって腐食の進行を抑制する様になるの
である。There is a dense and stable layer enriched with P and Cr, which acts as a protective film for the cast iron and suppresses the progress of corrosion.
また、本発明の耐候性鋳鉄での炭化物面積率の好ましい
範囲について以下に述べる。Further, the preferred range of the carbide area ratio in the weather-resistant cast iron of the present invention will be described below.
本発明の鋳鉄の優れた耐候性を示す理由は、鉄基地中に
固溶された合金元素が、錆の発生と共に鉄表面に濃縮し
、緻密な保護膜を生成するためである。従ってその合金
元素が偏析したり、所定危地鉄中に固溶されてなければ
、耐候性能は劣化する。一方、鋳鉄中の炭化物は、これ
らの合金元素（本耐候性鋳鉄ではＣｒ、 Ｐである）
を多量に吸収するため、結果的に地鉄中の合金固溶量を
低下させ耐候性能を劣化させる。また炭化物量が多くな
ると材質を硬く脆くさせるため、本耐候性鋳鉄の特徴で
ある優れた加工性をも劣化させる。第３図に示す様に、
鋳鉄中の炭化物面積率が高（なると硬さが著しく上昇し
、面積率が１０％近くになると一般の工作機では加工が
困難となる。これらの理由から本発明の耐候性鋳鉄の炭
化物生成量は少ない方が良く、炭化物面積率は５％以下
が好ましい。The reason why the cast iron of the present invention exhibits excellent weather resistance is that the alloying elements dissolved in the iron base concentrate on the iron surface as rust occurs, forming a dense protective film. Therefore, if the alloying element segregates or is not solidly dissolved in the specified hazardous iron, the weather resistance performance will deteriorate. On the other hand, carbides in cast iron are composed of these alloying elements (Cr and P in this weather-resistant cast iron).
As a result, the amount of alloy solid solution in the steel base is reduced and the weather resistance performance is deteriorated. In addition, when the amount of carbides increases, the material becomes hard and brittle, which deteriorates the excellent workability that is a feature of this weather-resistant cast iron. As shown in Figure 3,
When the carbide area ratio in cast iron is high (the hardness increases significantly, and when the area ratio approaches 10%, it becomes difficult to process with general machine tools. For these reasons, the amount of carbide produced in the weathering cast iron of the present invention is The smaller the amount, the better, and the carbide area ratio is preferably 5% or less.
次に実施例に基づいて本発明を説明する。Next, the present invention will be explained based on examples.
〈実施例〉 本発明の耐候性鋳鉄を工業地帯で２ケ所（Ａ。<Example> The weather-resistant cast iron of the present invention was installed at two locations in an industrial area (A.
Ｂ）、Ｈ！海工業地帯で１ケ所について２年間の大気暴
露試験を行った結果について以下に述べる。B), H! The following describes the results of a two-year atmospheric exposure test conducted at one location in a marine industrial area.
第１表に試験に供した本発明鋳鉄及び比較材の化学組成
を示す。記号はＡ−Ｅは本発明の成分１ｕ囲で溶製され
た耐候性鋳鉄、記号Ｆ〜旧ま比較材である。Table 1 shows the chemical compositions of the cast iron of the present invention and comparative materials used in the test. Symbols A-E are weather-resistant cast iron melted with 1 μ of the ingredients of the present invention, and symbols F to old are comparative materials.
第４図に大気暴露試験の結果を示す。本発明の耐候性鋳
鉄は、普通鋳鉄や普通鋼に比べて著しく腐食量が少なく
、耐候性鋼と同等あるいは、それ以上の耐候性能を有し
ていることを確認でき、耐候性鉄鋼材として充分満足で
きるものであることが１男白である。Figure 4 shows the results of the atmospheric exposure test. It can be confirmed that the weathering cast iron of the present invention has significantly less corrosion than ordinary cast iron or ordinary steel, and has weather resistance performance equal to or higher than that of weathering steel, and is sufficient as a weathering steel material. The only thing that is satisfactory is that the first son is white.
また、第５図は供試材に形成された錆層のＥＰＭＡ分析
結果を代表例５種について示したものであるが、本発明
の耐候性鋳鉄の錆層には耐候性鋼と同様にＣｕ、 Ｐ
、 Ｃｒの濃縮された層が存在することが６′ｒ１認で
きる。Furthermore, Fig. 5 shows the results of EPMA analysis of the rust layer formed on the test materials for five representative examples. , P
, 6′r1 shows the presence of a Cr-enriched layer.
向、試験に供した耐候性鋳鉄はいずれも炭化物の生成は
殆んどなく、硬さも３３〜３９ ＩＩ ｓ程度で加工性
も良好であった。In all of the weather-resistant cast irons tested, there was almost no formation of carbides, the hardness was about 33 to 39 II s, and the workability was good.
〈発明の効果〉
以上のように本発明によれば鋳鉄に微量の合金元素を添
加することによって、大気暴露中に、Ｃｕ。<Effects of the Invention> As described above, according to the present invention, by adding a trace amount of alloying elements to cast iron, Cu can be removed during exposure to the atmosphere.
Ｐ、Ｃｒの濃縮した緻密で安定性の良い耐候性に優れた
錆層を形成し、高合金鋳鉄にせずとも優れた耐食性を示
すようになるため、安価で鋳造性、８！械加工性の優れ
た耐候性鋳鉄を得ることができる。It forms a dense, stable, and weather-resistant rust layer enriched with P and Cr, and exhibits excellent corrosion resistance even without the use of high-alloy cast iron, making it inexpensive and easy to cast.8! Weather-resistant cast iron with excellent machinability can be obtained.
従って建築用、構造・意匠部材、例えば内・外壁材、４
ｒｊ！干、＊東部材、門柱、屋根瓦、門扉等の耐候性意
匠部材として極めて有用な材料である。Therefore, architectural, structural and design components, such as interior and exterior wall materials, 4
rj! It is an extremely useful material as a weather-resistant design component for things such as dried, eastern lumber, gateposts, roof tiles, and gates.
尚、本耐候性鋳鉄はペイント等の塗装を行った場合、長
期使用による塗膜の欠陥部や局所的な劣化部において形
成される錆層が耐候性に優れた保護膜を形成するため、
錆の拡散を抑制し、塗装の寿命を延命する効果も有して
おり、この点に関しても有用な材料である。In addition, when this weather-resistant cast iron is coated with paint, etc., the rust layer that forms in defective areas and locally deteriorated areas of the paint film due to long-term use forms a protective film with excellent weather resistance.
It also has the effect of suppressing the spread of rust and extending the life of the coating, making it a useful material in this respect as well.
第１図は大気基ｎ試験におけるＰ含有量と腐食量の関係
を示すグラフ、第２図も同様にＣｕ含有量と腐食量の関
係を示すグラフ、第３図は炭化物面積率と硬さの関係を
表す図、第４図は大気暴露試験２年間における腐食量を
示したグラフ、第５図は形成された！＃層のＥＰＭＡ分
析結果を示すグラフである。Figure 1 is a graph showing the relationship between P content and corrosion amount in the air-based n test, Figure 2 is a graph showing the relationship between Cu content and corrosion amount, and Figure 3 is a graph showing the relationship between carbide area ratio and hardness. A diagram showing the relationship, Figure 4 is a graph showing the amount of corrosion during two years of atmospheric exposure test, and Figure 5 is a graph showing the amount of corrosion formed! It is a graph showing the EPMA analysis result of the # layer.
Claims (1)
．２）｝が０．８〜１．１で、Ｃ：２．８〜３．６％、
Ｓｉ：１．６〜３．２％、Ｍｎ：０．２〜１．０％、Ｓ
：０．００３〜０．０３０％、Ｐ：０．０５〜０．５％
、Ｃｒ：０．１〜１．０％、Ｃｕ：０．３〜２．０％、
Ｎｉ：０．１〜２．０％、Ｃａ：０．００１〜０．００
５％をそれぞれ重量％で含有し、残部Ｆｅ及び不可避的
不純物からなることを特徴とする耐候性に優れた鋳鉄。 ２、金属組織に含まれる炭化物の面積率が５％以下であ
ることを特徴とする請求項１記載の耐候性に優れた鋳鉄
。[Claims] 1. Carbon saturation {Sc=C%/(4.23-Si%/3
．． 2)} is 0.8 to 1.1, C: 2.8 to 3.6%,
Si: 1.6-3.2%, Mn: 0.2-1.0%, S
:0.003~0.030%, P:0.05~0.5%
, Cr: 0.1-1.0%, Cu: 0.3-2.0%,
Ni: 0.1-2.0%, Ca: 0.001-0.00
Cast iron with excellent weather resistance, characterized by containing 5% by weight of Fe and the remainder consisting of Fe and unavoidable impurities. 2. The cast iron with excellent weather resistance according to claim 1, wherein the area ratio of carbides contained in the metal structure is 5% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003635A JPH0635641B2 (en) | 1989-01-12 | 1989-01-12 | Cast iron with excellent weather resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003635A JPH0635641B2 (en) | 1989-01-12 | 1989-01-12 | Cast iron with excellent weather resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02185947A true JPH02185947A (en) | 1990-07-20 |
| JPH0635641B2 JPH0635641B2 (en) | 1994-05-11 |
Family
ID=11562942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1003635A Expired - Fee Related JPH0635641B2 (en) | 1989-01-12 | 1989-01-12 | Cast iron with excellent weather resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0635641B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5542140A (en) * | 1978-09-18 | 1980-03-25 | Inoue Japax Res Inc | Coil for electromagnetic forming |
-
1989
- 1989-01-12 JP JP1003635A patent/JPH0635641B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5542140A (en) * | 1978-09-18 | 1980-03-25 | Inoue Japax Res Inc | Coil for electromagnetic forming |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0635641B2 (en) | 1994-05-11 |
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