JPS5844739B2 - Steel that withstands aluminum attack - Google Patents
Steel that withstands aluminum attackInfo
- Publication number
- JPS5844739B2 JPS5844739B2 JP10633077A JP10633077A JPS5844739B2 JP S5844739 B2 JPS5844739 B2 JP S5844739B2 JP 10633077 A JP10633077 A JP 10633077A JP 10633077 A JP10633077 A JP 10633077A JP S5844739 B2 JPS5844739 B2 JP S5844739B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- aluminum
- attack
- present
- withstands
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Description
【発明の詳細な説明】
本発明は、溶融金属アルミニウム又は溶融アルミニウム
合金に対して優れた耐食性を有する鋼に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steel having excellent corrosion resistance against molten metal aluminum or molten aluminum alloys.
一般に、固体金属は液体金属に接すると、溶出又は境界
面における異相の形成などによって激しく侵される。Generally, when a solid metal comes into contact with a liquid metal, it is severely attacked by elution or the formation of a foreign phase at the interface.
従って、このような還境の下において使用される金属に
対しては、溶出の防止や金属間化合物のような異相が生
じ難い合金や、表面処理方法が種々開発されているが、
アルミニウムアタックに対しては、またこのような効果
的な合金及び表面処理方法が開発されていないのが現状
である。Therefore, various alloys and surface treatment methods have been developed for metals used under such conditions, which prevent elution and which are less likely to produce foreign phases such as intermetallic compounds.
At present, such effective alloys and surface treatment methods have not been developed for aluminum attack.
一方、工業的見地からは、アルミニウムメッキ鋼板が溶
融金属アルミニウム浴中において圧延製造されているが
、この製造に使用されるロールが激しいアルミニウムア
タックによって短期間内に使用不能となることが、大き
な問題となっている。On the other hand, from an industrial standpoint, aluminized steel sheets are manufactured by rolling in a molten metal aluminum bath, but a major problem is that the rolls used for this manufacturing become unusable within a short period of time due to severe aluminum attack. It becomes.
このような観点から、本発明は優れた耐アルミニウムア
タック性を有し、しかも、ロールやその他の部品にも容
易に製造可能な表面処理鋼を提供することを、その目的
とするものである。From this viewpoint, an object of the present invention is to provide a surface-treated steel that has excellent aluminum attack resistance and can be easily manufactured into rolls and other parts.
本発明は、この目的を達成するために、２％以上のクロ
ムを含む鋼に過剰浸炭処理を加えると、（Ｆｅ、Ｃｎ）
３Ｃから成る炭化物が微細な球状の形で表面層に生威し
、これが溶融アルミニウム等に対して優れた耐食性を有
するという実験的知見に基づいて、この過剰浸炭処理を
施すべき鋼の化学成分を
炭素０．１０−０．２５％、けい素１．０％以下、マン
ガン１．０％以下、クロム２．０〜７．０％、モリブデ
ン０．１〜１．０％、残部は通常の不純物以外は鉄とす
ることを特徴とするものである。In order to achieve this objective, the present invention proposes that when excessive carburizing treatment is applied to steel containing 2% or more chromium, (Fe, Cn)
Based on the experimental findings that carbides consisting of 3C grow in the form of fine spheres on the surface layer and have excellent corrosion resistance against molten aluminum, etc., the chemical composition of the steel to be subjected to this excessive carburizing treatment was determined. Carbon 0.10-0.25%, Silicon 1.0% or less, Manganese 1.0% or less, Chromium 2.0-7.0%, Molybdenum 0.1-1.0%, the rest is normal impurities. The other features are made of iron.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
まず、本発明によるアルミニウムアタックに耐える鋼に
おける化学成分の限定理由について説明する。First, the reason for limiting the chemical composition of the steel that can withstand aluminum attack according to the present invention will be explained.
炭素：浸炭鋼として熱処理後に適正な心部強度が得られ
、しかも、表層部にマイナスの残留応力を生じさせない
ためには、０．１０％以上０．２５％以下に限定しなけ
ればならない。Carbon: Carbon must be limited to 0.10% or more and 0.25% or less in order to obtain appropriate core strength after heat treatment as carburized steel and not to generate negative residual stress in the surface layer.
けい素：良好な脱酸と流動性とを具備し、健全なな鋼塊
を得るためには、むしろ高目が望ましいが、浸炭性を害
するので、１．０％以下にとどめる必要がある。Silicon: In order to obtain a healthy steel ingot with good deoxidation and fluidity, a high silicon content is preferable, but since it impairs carburizability, it must be kept at 1.0% or less.
マンガン：溶湯の脱酸を促進し、健全な鋼塊と６部まで
の焼入れ性とを確保するためには、１．０％までの添加
が必要である。Manganese: It is necessary to add up to 1.0% to promote deoxidation of the molten metal and ensure a sound steel ingot and hardenability up to 6 parts.
クロム：浸炭処理に伴って球状炭化物を生成させるには
、２．０％以上が必要であるが、７％を越えると、加工
性を損なう。Chromium: 2.0% or more is required to generate spherical carbides during carburization, but if it exceeds 7%, workability will be impaired.
モリブデン：浸炭層のしん性を確保するためには、クロ
ム量に合わせて０．１０％以上の添加が必要であるが、
７％クロムでも１．０％以上の添加は必要がない。Molybdenum: In order to ensure the toughness of the carburized layer, it is necessary to add 0.10% or more according to the amount of chromium.
Even with 7% chromium, it is not necessary to add 1.0% or more.
次ぎに、上記のような化学成分を有する本発明鋼に施す
べき過剰浸炭処理法について説明する。Next, an explanation will be given of an excessive carburizing treatment method to be applied to the steel of the present invention having the above-mentioned chemical composition.
添附の写真は
炭素 けい素 マンガン クロム モリブデン０．１２
０．４０ ０，５５ ３．１ ０．４５の化学
成分（重量％）を有する本発明鋼に炭素ポテンシアルの
異なるふんい魚肉において浸炭処理を施した場合の表面
層における炭化物の生成状態を示す顕微鏡組織（２００
倍）である。The attached photo shows carbon silicon manganese chromium molybdenum 0.12
0.40 0.55 3.1 Microscope showing the state of carbide formation in the surface layer when the steel of the present invention having a chemical composition (wt%) of 0.45 is carburized in fluffy fish meat with different carbon potentials. Organization (200
times).
この場合、浸炭炉としてドリップフィード式炉を用い、
露点を０℃（写真Ａ）、３．５℃（同Ｂ）及び５℃（同
Ｃ）と変えて９３０℃Ｘ ４ ｈｒの浸炭処理をそれぞ
れ行なったが、露点が高くなるに伴って（すなわち、炭
素ポテンシアルが低くなるに伴って）生成炭化物が粗大
化する傾向を示し、また、網状に分布するようになる。In this case, a drip-feed furnace is used as the carburizing furnace,
Carburizing was carried out at 930°C for 4 hours with the dew point changed to 0°C (Photo A), 3.5°C (Photo B), and 5°C (Photo C), but as the dew point became higher (i.e. , as the carbon potential becomes lower), the produced carbides tend to become coarser and distributed in a net-like manner.
ここで、従来から鋼ｌζ対する過剰浸炭処理がきられれ
ていたのは、このような網状炭化物の生成があるためで
ある。Here, the reason why steel lζ has not been subjected to excessive carburizing treatment in the past is due to the formation of such network carbides.
この点、本発明においても、炭素ポテンシアルを下げる
とこのような網状炭化物が生成するようになるので、本
発明鋼に施すべき過剰浸炭処理は、飽くまでも俤＊網状
炭化物の生成しないような高い炭素ポテンシアルによる
処理（すなわち、写真Ａに示す露点０℃浸炭）に限定さ
れなければならない。In this regard, in the present invention as well, if the carbon potential is lowered, such reticulated carbides will be generated, so the excessive carburizing treatment to be applied to the steel of the present invention must be carried out at a high carbon potential that does not generate reticulated carbides. (i.e. dew point 0°C carburization shown in Photo A).
最後に、アルミニウムアタック試験結果について説明す
る。Finally, the aluminum attack test results will be explained.
表には、同表の左半分に示す８種の試料Ａ−Ｈを、７０
０′Ｃの溶融金属アルミニウム中に２０ ｈｒ浸漬した
場合の腐食量が右半分に記載されているが、この腐食量
を比較すると、本発明による化学成分を有し、これに過
剰浸炭処理を加えた試料Ａ及びＣは未浸炭材に比べて、
けた違いに小さな腐食量を示し、その耐食性は、ＪＩＳ
浸炭鋼であるＳＮＣＭ ２３及びＳＣＭ２４をそれぞ
れ浸炭処理した試料Ｅ及びＦに比べて著しく優れている
ことはもちろんのこと、耐食鋼５ＵＳ３１０（試料Ｇ）
及びＳＵＳ ４１０Ｊ（試料Ｈ）に比べても、著しく
良好な耐アルミニウムアタック性を示すことが分かる。In the table, eight types of samples A-H shown in the left half of the table are listed.
The amount of corrosion when immersed in molten metal aluminum at 0'C for 20 hours is shown on the right half.Comparing this amount of corrosion, it is found that the product has the chemical composition according to the present invention and has been subjected to excessive carburization. Samples A and C were compared to the uncarburized material.
It exhibits an extremely small amount of corrosion, and its corrosion resistance is JIS
Not only is it significantly superior to Samples E and F, which are carburized steels SNCM 23 and SCM24, respectively, but also corrosion-resistant steel 5US310 (Sample G).
It can be seen that it exhibits significantly better aluminum attack resistance than SUS 410J (Sample H).
以上のように、本発明による鋼は、適切な過剰浸炭処理
を施すことによって、溶融金属アルミニウムや溶融アル
ミニウム合金に対して極めて優れた耐食性を発揮するの
で、例えば、アルミニウムメッキ鋼板製造用のロールを
始め、アルミニウムアタックを受ける各種の構造部品用
鋼材として使用して、極めて高い経済性を与えることが
できる。As described above, the steel according to the present invention exhibits extremely excellent corrosion resistance against molten metal aluminum and molten aluminum alloys by subjecting it to appropriate excessive carburizing treatment. Initially, it can be used as a steel material for various structural parts that are subject to aluminum attack, offering extremely high economic efficiency.
図面に代る写真は、本発明に係る化学成分を有する鋼を
ドリップフィード炉を用い、露点Ｏ℃、３．５℃及び５
℃において、それぞれ、９３０°ＣＸ ４． ｈ ｒの
過剰浸炭処理を施した場合の表層部における炭化物の生
成状態を示す顕微鏡組織（倍率２００）である。The photographs in place of drawings show that steel having the chemical composition according to the present invention was heated in a drip feed furnace at dew points of 0°C, 3.5°C and 5°C.
℃, respectively 930°CX 4. This is a microscopic structure (magnification: 200) showing the state of carbide formation in the surface layer when excessive carburizing treatment is performed for hr.
Claims (1)
マンガン１．０％以下、クロム２、Ｏ〜７．０％、モリ
ブデン０．１〜１．０％、残部は通常の不純物以外は鉄
から成る化学成分を有し゛、過剰浸炭処理を施すことに
よって、表面層に球状微細炭化物が生成されることを特
徴とするアノクミニウムアタックに耐える鋼。1 Carbon 0.10-0.25%, silicon 1.0% or less,
It has a chemical composition of less than 1.0% manganese, 2% chromium, 0~7.0% chromium, 0.1~1.0% molybdenum, and the rest is iron other than normal impurities. , a steel that can withstand anochminium attack, characterized by the formation of spherical fine carbides on the surface layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10633077A JPS5844739B2 (en) | 1977-09-06 | 1977-09-06 | Steel that withstands aluminum attack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10633077A JPS5844739B2 (en) | 1977-09-06 | 1977-09-06 | Steel that withstands aluminum attack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5440218A JPS5440218A (en) | 1979-03-29 |
| JPS5844739B2 true JPS5844739B2 (en) | 1983-10-05 |
Family
ID=14430880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10633077A Expired JPS5844739B2 (en) | 1977-09-06 | 1977-09-06 | Steel that withstands aluminum attack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5844739B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS575861A (en) * | 1980-06-12 | 1982-01-12 | Sumitomo Electric Ind Ltd | Surface treating method |
| DE3202978C2 (en) * | 1982-01-29 | 1990-01-04 | Braun Ag, 6000 Frankfurt | Electric iron |
| US4636613A (en) * | 1985-04-10 | 1987-01-13 | Anne J. de la Morandiere | Combination dryer and iron |
| JPH06941B2 (en) * | 1987-08-13 | 1994-01-05 | 新日本製鐵株式会社 | Carburizing steel |
| DE4333541C2 (en) * | 1993-10-01 | 1996-04-04 | Rudolf Goeckel | Hair dryer with assigned ironing surface |
| CN112359277B (en) * | 2020-10-15 | 2021-12-17 | 中天钢铁集团有限公司 | Control method for segregation and net carbon of 86-level high-strength cord steel wire rod |
-
1977
- 1977-09-06 JP JP10633077A patent/JPS5844739B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5440218A (en) | 1979-03-29 |
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