JPH0551668A - Seacost high corrosion resistance weather resistant steel - Google Patents
Seacost high corrosion resistance weather resistant steelInfo
- Publication number
- JPH0551668A JPH0551668A JP23895291A JP23895291A JPH0551668A JP H0551668 A JPH0551668 A JP H0551668A JP 23895291 A JP23895291 A JP 23895291A JP 23895291 A JP23895291 A JP 23895291A JP H0551668 A JPH0551668 A JP H0551668A
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- JP
- Japan
- Prior art keywords
- steel
- oxide
- corrosion resistance
- less
- powder
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、橋梁、建築等の鋼構造
物において、特に海岸地帯など塩素イオンの多い腐食環
境下での耐食性の優れた海岸高耐食耐候性鋼に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel structure for bridges, buildings and the like, which relates to a high corrosion and weather resistant steel having high corrosion resistance particularly in a corrosive environment containing a lot of chlorine ions such as in a coastal area.
【０００２】[0002]
【従来の技術】従来、耐候性鋼などに代表されるＣｕ，
Ｐなどを微量含む低合金鋼の場合、大気暴露によって鋼
表面に形成される錆被膜は高い防食機能を有する安定錆
となることが知られている。しかし、海岸地帯など塩分
の多い環境では上述の安定錆が形成され難い。これは、
塩分の多い環境中では、鋼の腐食に伴って錆被膜下のｐ
Ｈが低下しやすいことに起因している。つまり、鋼の腐
食が始まると通常鋼表面のｐＨは低下する傾向がある
が、錆被膜中あるいは錆と界面のｐＨが一旦低下すると
錆被膜中の塩素イオンの輪率が増大し、塩素イオンの濃
縮が鋼と錆の界面近傍に生じ、その結果そこに塩酸雰囲
気が形成され腐食を促進し始めるのである。また、それ
と同時にｐＨの低下によって鉄イオンの溶解度が大きく
なり、耐候性鋼など耐食低合金鋼の防食機構の源である
安定錆の形成が阻止される状態を作り出すのである。2. Description of the Related Art Conventionally, Cu represented by weathering steel,
In the case of a low alloy steel containing a small amount of P and the like, it is known that the rust film formed on the steel surface by exposure to the atmosphere becomes stable rust having a high anticorrosion function. However, the stable rust described above is unlikely to be formed in a salty environment such as the coastal area. this is,
In an environment with a lot of salt, p
This is because H tends to decrease. In other words, when corrosion of steel begins, the pH of the steel surface usually tends to decrease, but once the pH of the rust film or the interface with the rust decreases, the ring ratio of chlorine ions in the rust film increases, and Concentration occurs near the steel-rust interface, which results in the formation of a hydrochloric acid atmosphere, which begins to accelerate corrosion. At the same time, the decrease in pH increases the solubility of iron ions, creating a state in which the formation of stable rust, which is the source of the anticorrosion mechanism of corrosion resistant low alloy steel such as weather resistant steel, is prevented.
【０００３】このように、錆被膜中におけるｐＨの低下
は鉄の溶解速度を速めると同時に安定錆の形成を阻むと
いう鋼材にとって好ましからざる状況を作り出すわけで
あるが、これを阻止するためには、鋼表面をアルカリ化
する金属酸化物を予め鋼材中に分散させておき、腐食反
応と同時にその金属酸化物を作用させ、上述の腐食加速
状況の形成を阻止する方法が有効と考えられる。このよ
うな発想にたって発明された鋼の例として特公昭５８−
２５４５８号公報がある。この先行技術によると鋼表面
のアルカリ化作用を狙わせる鋼中添加金属酸化物として
は、Ｂｅ，Ｍｇ，Ｃａ，Ｓｒ，Ｂａの酸化物を挙げてい
る。これらの酸化物を添加することにより、酸化物が地
鉄と共にわずかでも溶解すると、錆下でも地鉄界面は高
いｐＨに保たれ、これにより腐食が抑制されるいうもの
である。As described above, lowering the pH in the rust coating creates an unfavorable situation for steel materials in which the dissolution rate of iron is increased and at the same time the formation of stable rust is prevented, but in order to prevent this, A method of preliminarily dispersing a metal oxide for alkalizing the steel surface in the steel material and causing the metal oxide to act simultaneously with the corrosion reaction to prevent the formation of the above-described accelerated corrosion condition is considered to be effective. As an example of steel invented based on such an idea, Japanese Patent Publication No. 58-
There is a 25458 publication. According to this prior art, oxides of Be, Mg, Ca, Sr, and Ba are mentioned as the additive metal oxides in the steel that are intended to have an alkalizing action on the steel surface. By adding these oxides, even if the oxides are slightly dissolved together with the base iron, the base iron interface is kept at a high pH even under rust, and corrosion is thereby suppressed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記し
た特公昭５８−２５４５８号公報のように普通鋼にＢ
ｅ，Ｍｇ，Ｃａ，Ｓｒ，Ｂａの酸化物の１種以上を含有
させ鋼表面をアルカリ化することによって腐食反応と同
時に、その金属酸化物を作用させることが有効であるこ
とはわかるが、現在の製鋼技術では純粋な酸化物を鋼中
に均一分散させることが難しく、そのために工業的には
実用化されていないのが実状である。However, as in the above-mentioned Japanese Patent Publication No. 58-25458, B is added to ordinary steel.
Although it has been found that it is effective to cause the metal oxide to act at the same time as the corrosion reaction by alkalizing the steel surface by containing one or more oxides of e, Mg, Ca, Sr and Ba, It is difficult to uniformly disperse a pure oxide in steel by the steelmaking technology of No. 1, and therefore it is the fact that it has not been put to practical use industrially.
【０００５】[0005]
【課題を解決するための手段】本発明は、このような問
題点を解決すべき、種々研究を重ねた結果、平均粒径
０．１μｍ以下の酸化物粒子と平均粒径２００μｍ以下
の鉄粉を混練した予備処理粉末を用いることにより、現
在の製鋼技術においても充分に鋼中に均一分散させるこ
とが出来るものである。その発明の要旨とするところ
は、 重量％で、Ｃ ：０．１％以下 Ｓｉ：０．０３〜０．３５％ Ｍｎ：１．５％以下 Ｐ ：０．０５〜０．１５％ Ｓ ：０．０１％以下 Ｃｕ：０．２５〜２．０％ Ｎｉ：０．１〜７．０％ Ｍｏ：０．００５〜２．０％ Ａｌ：０．００５〜０．０７％ Ｔｉ：０．０３％以下 Ｎｂ：０．００５〜０．１０％ Ｃａ：０．０００１〜０．１０％ 残部Ｆｅ及び不可避的不純物ならなり、かつ、平均粒径
１μｍ以下の酸化物粒子と平均粒径２００μｍ以下の鉄
粉を混練した予備処理粉末を前記成分組成の溶鋼に添加
し、該酸化物の粒径５μｍ以下のものを均一分散させた
ことを特徴とする海岸高耐食耐候性鋼にある。As a result of various studies to solve such problems, the present invention has revealed that oxide particles having an average particle diameter of 0.1 μm or less and iron powder having an average particle diameter of 200 μm or less. By using the pre-treated powder obtained by kneading, it is possible to sufficiently disperse it in the steel even in the current steelmaking technology. The gist of the invention is, by weight%, C: 0.1% or less, Si: 0.03 to 0.35% Mn: 1.5% or less, P: 0.05 to 0.15% S: 0. 0.01% or less Cu: 0.25 to 2.0% Ni: 0.1 to 7.0% Mo: 0.005 to 2.0% Al: 0.005 to 0.07% Ti: 0.03% Below Nb: 0.005 to 0.10% Ca: 0.0001 to 0.10% The balance is Fe and unavoidable impurities, and oxide particles having an average particle size of 1 μm or less and iron powder having an average particle size of 200 μm or less. A high-corrosion and weather-resistant coastal steel characterized in that a pretreated powder obtained by kneading is added to molten steel having the above-mentioned composition to uniformly disperse oxides having a particle size of 5 μm or less.
【０００６】以下本発明について詳細に説明する。本発
明においては、酸化物粒子と金属粉末を混合、混練した
予備処理粉末を溶鋼に添加することが最大の特徴であ
る。そのために、先ず酸化物粒子の比重を大きくして溶
鋼への添加を容易にし、かつ、溶鋼中への均一分散を図
るために、鉄粉を利用して鉄粉の周りに酸化物粒子を付
着させて全体の比重を大きくしようとするものである。
すなわち、鉄粉の周りに付着した形の酸化物粒子を機械
合金化法、いわゆる鉄粉と酸化物粒子を、高エネルギ−
ミル（アトライタ−）中で混合し、機械的圧縮、破壊、
接合を繰返しマトリックス中に酸化物粒子が均一に分散
した粉末が生成する。そのために、金属粉末である鉄粉
の粒径を２００μｍ以下と規制し、この鉄粉の表面に機
械的に付着させる前処理が必要である。鉄粉の粒径を規
制した理由は酸化物粒子との関係から鉄粉の平均粒径の
上限については、寸法が大きくなり過ぎると酸化物粒子
と鉄粉とが不均一混合となり易いので２００μｍ以下と
定めた。また、酸化物粒子を１μｍ以下とした。この理
由は鉄粉との混合、混練した予備処理粉末を溶鋼に添加
した結果、一部の酸化物粒子が凝集しても溶鋼中に５μ
ｍ以下の酸化物を均一分散させるために１μｍ以下とし
た。The present invention will be described in detail below. The greatest feature of the present invention is that the pretreated powder obtained by mixing and kneading the oxide particles and the metal powder is added to the molten steel. Therefore, first, to increase the specific gravity of oxide particles to facilitate addition to molten steel, and to achieve uniform dispersion in molten steel, use iron powder to attach oxide particles around iron powder. It is intended to increase the overall specific gravity.
That is, the oxide particles adhered around the iron powder are subjected to a mechanical alloying method, that is, so-called iron powder and oxide particles are treated with high energy.
Mixing in a mill (attritor), mechanical compression, breaking,
The bonding is repeated to form a powder in which oxide particles are uniformly dispersed in the matrix. Therefore, it is necessary to perform a pretreatment in which the particle diameter of the iron powder, which is a metal powder, is regulated to 200 μm or less and the iron powder is mechanically attached to the surface. The reason why the particle size of the iron powder is regulated is that the upper limit of the average particle size of the iron powder is 200 μm or less because the oxide particles and the iron powder are likely to be non-uniformly mixed when the size is too large, because of the relationship with the oxide particles. I decided. Further, the oxide particles were 1 μm or less. The reason for this is that even if some of the oxide particles agglomerate as a result of adding the pretreated powder that has been mixed and kneaded with the iron powder to the molten steel,
In order to uniformly disperse oxides of m or less, the thickness was 1 μm or less.
【０００７】これら、酸化物粒子を溶鋼に直接添加する
理由は、合金鋼の焼結体と異なり、高耐候性厚板製品を
連続的に大量生産することにある。また、酸化物粒子を
単独添加しないで、混合粉として添加する理由は、酸化
物粒子は凝集して粉体を形成し、体積が増加している上
に比重が溶鋼よりも小さいために単独で添加すると浮上
して溶鋼中に歩留らないためである。凝集している酸化
物粒子を分離して体積を小さくするために鉄粉と混合さ
せた。また、鉄粉を選定した理由は、溶鋼中に添加した
際、分離浮上しないためである。更に、酸化物粒子とし
てはＣａＯ，及びＭｇＯが使用される。ＣａＯ，及びＭ
ｇＯとした理由は上述のように、鋼表面をアルカリ化す
る金属酸化物を予め鋼材中に分散させておき、腐食反応
と同時にその金属酸化物を作用させ、腐食加速の形成を
阻止するものである。従ってこの２種に限定するもので
はなく、同一効果を達成するものであれば良い。The reason why these oxide particles are directly added to the molten steel is that, unlike the sintered body of the alloy steel, the highly weather-resistant thick plate product is continuously mass-produced. Further, the reason for adding as a mixed powder without adding the oxide particles alone is that the oxide particles are aggregated to form a powder, and since the volume is increased and the specific gravity is smaller than that of the molten steel, it is used alone. This is because if added, it floats and does not yield in the molten steel. Aggregated oxide particles were separated and mixed with iron powder to reduce the volume. Further, the reason why iron powder is selected is that it does not separate and float when added to molten steel. Further, CaO and MgO are used as the oxide particles. CaO and M
The reason for using gO is that, as described above, the metal oxide that alkalizes the steel surface is dispersed in the steel material in advance, and the metal oxide acts simultaneously with the corrosion reaction to prevent the formation of accelerated corrosion. is there. Therefore, the present invention is not limited to these two types, as long as the same effect is achieved.
【０００８】[0008]
【作用】次に、本発明の目的とする特性を達成するため
には各々の構成元素量についても以下に述べるように適
正範囲に限定する必要がある。 Ｃ ：０．１０％以下 Ｃは強度を向上するために有効な成分であるが、０．１
％を越えると耐食性が劣化することから上限を０．１％
とした。 Ｓｉ：０．０３〜０．３５％ Ｓｉは脱酸のために０．０３％以上必要とするが、多量
に用いると鋼の靭性が劣化すると共に０．３５％を越え
ると耐食性が劣化することから、上限を０．３５％とし
た。 Ｍｎ：１．５％以下 Ｍｎは脱酸、脱硫剤として、また、強度、熱間加工性を
改善した適正な組織を得るために有用な元素であるが、
１．５％を越えると、強度が上がるものの曲げ等の加工
性や靭性の劣化を招き、特に溶接性が劣化するため１．
５％を上限とした。 Ｐ：０．０５〜０．１５％ Ｐは錆被膜中への有害な塩素イオンの浸入を阻止し、安
定錆を形成させる上での必須元素であって、最低でも
０．０５％は必要であるが、しかし０．１５％を越える
と溶接性が悪化することから上限を０．１５％以下とし
た。 Ｓ：０．０１％以下 Ｓは耐食性を劣化させる元素であることから、許容でき
る上限は０．０１％である。Next, in order to achieve the desired characteristics of the present invention, it is necessary to limit the amount of each constituent element to an appropriate range as described below. C: 0.10% or less C is an effective component for improving strength, but 0.1
%, The corrosion resistance deteriorates, so the upper limit is 0.1%.
And Si: 0.03 to 0.35% Si requires 0.03% or more for deoxidation, but if used in a large amount, the toughness of steel deteriorates, and if it exceeds 0.35%, corrosion resistance deteriorates. Therefore, the upper limit was set to 0.35%. Mn: 1.5% or less Mn is an element useful as a deoxidizing agent, a desulfurizing agent, and for obtaining an appropriate structure with improved strength and hot workability.
If it exceeds 1.5%, the strength is increased but the workability such as bending and the toughness are deteriorated, and particularly the weldability is deteriorated.
The upper limit was 5%. P: 0.05 to 0.15% P is an essential element for preventing harmful chloride ions from penetrating into the rust film and forming stable rust, and at least 0.05% is necessary. However, if it exceeds 0.15%, the weldability deteriorates, so the upper limit was made 0.15% or less. S: 0.01% or less Since S is an element that deteriorates corrosion resistance, the allowable upper limit is 0.01%.
【０００９】Ｃｕ：０．２５〜２．０％ ＣｕはＮｉと共存することにより耐食性を向上させる元
素である。その効果は０．２５％より現われる。余り多
く添加するとＣｕの微細析出が鋼中に生じ鋼表面におい
てミクロな電池を形成するため、鉄の腐食を促進する。
この腐食促進が顕著になるのは２．０％を越える場合で
あり、ここではこの値を上限とした。 Ｎｉ：０．１〜７．０％ Ｎｉは耐食性を向上させる上で有効な元素であり、Ｃｕ
の添加効果を助長する効果のある元素である。添加量が
０．１％未満では効果がない。７．０％を越えるとその
効果が飽和するとともにコストアップの原因となるので
７．０％を上限とした。 Ｍｏ：０．００５〜２．０％ Ｍｏは耐局部腐食性を向上させる上で有効な元素である
が、その効果は０．００５％より出始め２．０％で飽和
する。 Ａｌ：０．００５〜０．０７％ Ａｌは通常脱酸剤として用いられている０．００５〜
０．０７％の範囲とした。 Ｔｉ：０．０３％以下 Ｔｉは溶鋼の脱酸素及び強度を高めるために必要な元素
であるが、０．０３％以上の添加はかえって鋼の脆化が
起ることから上限を０．０３％以下とした。 Ｎｂ：０．００５〜０．１０％ Ｎｂは強度の向上と耐食性の改善に効果のある元素であ
るが、その効果を発揮させるには少なくとも０．００５
％の含有が必要であり、一方、０．１０％を越える含有
は効果が飽和に達するので、０．００５〜０．１０％の
範囲とする。Cu: 0.25 to 2.0% Cu is an element that improves the corrosion resistance by coexisting with Ni. The effect appears from 0.25%. If too much is added, fine precipitation of Cu occurs in the steel to form a micro battery on the steel surface, thus promoting the corrosion of iron.
This acceleration of corrosion becomes remarkable when it exceeds 2.0%, and this value was made the upper limit here. Ni: 0.1 to 7.0% Ni is an element effective in improving the corrosion resistance, and Cu
Is an element that has the effect of promoting the addition effect of If the addition amount is less than 0.1%, there is no effect. If it exceeds 7.0%, the effect is saturated and it causes a cost increase, so 7.0% was made the upper limit. Mo: 0.005-2.0% Mo is an element effective in improving the local corrosion resistance, but the effect begins to appear from 0.005% and is saturated at 2.0%. Al: 0.005-0.07% Al is usually used as a deoxidizer 0.005-
The range was 0.07%. Ti: 0.03% or less Ti is an element necessary for increasing deoxidation and strength of molten steel, but addition of 0.03% or more rather causes embrittlement of steel, so the upper limit is 0.03%. Below. Nb: 0.005 to 0.10% Nb is an element effective in improving strength and corrosion resistance, but at least 0.005 is required to exert the effect.
%, It is necessary to add 0.1%, and on the other hand, if the content exceeds 0.10%, the effect reaches saturation, so the content is made 0.005 to 0.10%.
【００１０】Ｃａ：０．０００１〜０．１％ Ｃａは耐食性を向上させる有効な元素であり、その向上
効果は鋼重量に対して０．０００１％以上含まれれば有
効に働くが、しかし、０．１％を越えると加工性及び溶
接性が劣化するため、Ｃａ量は０．０００１〜０．１％
とした。また、ＣａＯは鋼表面をアルカリ化する役目を
するもので、このＣａＯを予め鋼中に分散させておき、
腐食反応と同時にＣａＯが作用し鋼表面を高いｐＨによ
り生成した不動態膜を緻密にして、より強い耐食性を付
与するものである。このアルカリ化のため錆中へ溶解す
るには酸化物の平均粒径は５μｍ以下が必要で、これを
越えると不溶解または不均一溶解となり、その効果は減
少する。更にＭｇＯについてもＣａＯと同様の挙動を示
す。Ca: 0.0001 to 0.1% Ca is an effective element for improving the corrosion resistance, and its improving effect works effectively if it is contained in an amount of 0.0001% or more relative to the weight of steel, but 0%. If it exceeds 0.1%, the workability and weldability deteriorate, so the Ca content is 0.0001 to 0.1%.
And Further, CaO has a role of alkalizing the steel surface, and CaO is dispersed in the steel in advance,
At the same time as the corrosion reaction, CaO acts to densify the passivated film formed on the steel surface due to the high pH, thereby imparting stronger corrosion resistance. Due to this alkalinization, the average particle diameter of the oxide needs to be 5 μm or less in order to dissolve it in rust, and if it exceeds this, it becomes insoluble or non-uniformly dissolved, and its effect decreases. Further, MgO also behaves similarly to CaO.
【００１１】[0011]
【実施例】混合粉は鉄粉とＣａＯ粉体を炭化タングステ
ンボ−ルと共に容器に入れて、アトライタ−で混合する
ことにより製造した。そのときの鉄粉の平均粒径１００
〜１５０μｍ，ＣａＯ粉体の平均粒径０．１〜０．５μ
ｍを鉄粉とＣａＯ粒との体積比を５として混合し、予備
処理粉末を得る。一方、容量３００ｋｇの高周波溶解炉
で合金成分を調整した溶鋼をＡｌ脱酸した後に、鋳込み
途中の溶鋼流に予備処理粉末をアルゴンガスにより噴射
後鋳型に出鋼する。そのときの本発明鋼を比較例と共に
表１に示す。これら化学成分の鋼塊を熱間圧延で２０ｍ
ｍ厚みの鋼板とし、普通の方法で熱処理を行った。その
後試験片サイズ、幅４０ｍｍ×長さ１２０ｍｍ×厚さ５
ｍｍの試験片で耐食性試験を行い、腐食速度を求めた。
この腐食速度は、海岸での大気暴露試験を１年間行い、
その腐食重量減から求めた。その結果を表１に示した。
表１からわかるように、本発明鋼である（１）〜（１
０）の腐食速度は極めて小さい値を示しているのに対し
て、従来鋼である（１１）〜（１５）のいずれも腐食速
度は大きな値を示し、腐食の度合の大きいことを示して
いる。EXAMPLE A mixed powder was produced by placing iron powder and CaO powder in a container together with a tungsten carbide ball and mixing them with an attritor. Average particle size of iron powder at that time 100
~ 150μm, average particle size of CaO powder 0.1 ~ 0.5μ
m is mixed at a volume ratio of iron powder and CaO particles of 5 to obtain a pretreated powder. On the other hand, the molten steel whose alloy composition has been adjusted in a high-frequency melting furnace having a capacity of 300 kg is deoxidized with Al, and then the pretreated powder is injected into the molten steel flow in the middle of casting by argon gas, and then the steel is discharged to the mold. The steels of the present invention at that time are shown in Table 1 together with comparative examples. 20m by hot rolling of steel ingots with these chemical components
A m-thick steel plate was heat-treated by a usual method. After that, test piece size, width 40 mm x length 120 mm x thickness 5
A corrosion resistance test was conducted on a test piece of mm to determine the corrosion rate.
This corrosion rate is based on a coastal atmospheric exposure test for one year,
It was calculated from the reduced corrosion weight. The results are shown in Table 1.
As can be seen from Table 1, the steels of the present invention (1) to (1
The corrosion rate of 0) shows an extremely small value, whereas all of the conventional steels (11) to (15) show a large corrosion rate, indicating that the degree of corrosion is large. ..
【００１２】[0012]
【表１Ａ】 [Table 1A]
【００１３】[0013]
【表１Ｂ】 [Table 1B]
【００１４】[0014]
【発明の効果】以上述べたように、本発明に係る酸化物
分散による海岸高耐食耐候性鋼によれば、従来の耐候性
鋼、耐海水性鋼に比べて、特に耐塩性等の海水、海岸大
気にさらされるような環境下においても耐食性が極めて
改善され、しかも安価で容易に製鋼プロセスで鋼中にＣ
ａＯを均一分散させることが出来、かつ大量に製造する
ことが可能となったことは工業上極めて大きな効果を奏
するものである。As described above, according to the coast high corrosion and weather resistant steel by the oxide dispersion according to the present invention, compared with the conventional weather resistant steel and sea water resistant steel, especially seawater having salt resistance, Corrosion resistance is greatly improved even in an environment exposed to the coastal atmosphere, and it is cheap and easy to use C in the steel by a steelmaking process.
The fact that aO can be uniformly dispersed and a large amount of aO can be produced has an extremely great industrial effect.
Claims (1)
１μｍ以下の酸化物粒子と平均粒径２００μｍ以下の鉄
粉を混練した予備処理粉末を前記成分組成の溶鋼に添加
し、該酸化物の粒径５μｍ以下のものを均一分散させた
ことを特徴とする海岸高耐食耐候性鋼。1. By weight%, C: 0.1% or less Si: 0.03 to 0.35% Mn: 1.5% or less P: 0.05 to 0.15% S: 0.01% or less Cu: 0.25-2.0% Ni: 0.1-7.0% Mo: 0.005-2.0% Al: 0.005-0.07% Ti: 0.03% or less Nb: 0 0.005 to 0.10% Ca: 0.0001 to 0.10% Preliminarily prepared by kneading the balance Fe and unavoidable impurities with oxide particles having an average particle size of 1 μm or less and iron powder having an average particle size of 200 μm or less. A coastal high corrosion resistant and weather resistant steel characterized in that a treated powder is added to a molten steel having the above-mentioned composition to uniformly disperse oxides having a particle size of 5 μm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23895291A JPH0551668A (en) | 1991-08-27 | 1991-08-27 | Seacost high corrosion resistance weather resistant steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23895291A JPH0551668A (en) | 1991-08-27 | 1991-08-27 | Seacost high corrosion resistance weather resistant steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0551668A true JPH0551668A (en) | 1993-03-02 |
Family
ID=17037734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23895291A Withdrawn JPH0551668A (en) | 1991-08-27 | 1991-08-27 | Seacost high corrosion resistance weather resistant steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0551668A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100402127B1 (en) * | 1998-12-30 | 2004-02-05 | 주식회사 포스코 | Unpainted weatherproof steel manufacturing method |
| EP1825014A1 (en) * | 2004-11-12 | 2007-08-29 | Posco | Steel with excellent weather resistance at the seaside atmosphere, and manufacturing method therefor |
| KR100920597B1 (en) * | 2002-12-28 | 2009-10-08 | 주식회사 포스코 | Method for manufacturing steel with resistance to coastal atmospheric corrosion having tensile strength of 50kgf/mm2 grade |
| WO2014020665A1 (en) | 2012-07-30 | 2014-02-06 | 株式会社京都マテリアルズ | Coating and coated steel |
-
1991
- 1991-08-27 JP JP23895291A patent/JPH0551668A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100402127B1 (en) * | 1998-12-30 | 2004-02-05 | 주식회사 포스코 | Unpainted weatherproof steel manufacturing method |
| KR100920597B1 (en) * | 2002-12-28 | 2009-10-08 | 주식회사 포스코 | Method for manufacturing steel with resistance to coastal atmospheric corrosion having tensile strength of 50kgf/mm2 grade |
| EP1825014A1 (en) * | 2004-11-12 | 2007-08-29 | Posco | Steel with excellent weather resistance at the seaside atmosphere, and manufacturing method therefor |
| EP1825014A4 (en) * | 2004-11-12 | 2007-12-26 | Posco | Steel with excellent weather resistance at the seaside atmosphere, and manufacturing method therefor |
| WO2014020665A1 (en) | 2012-07-30 | 2014-02-06 | 株式会社京都マテリアルズ | Coating and coated steel |
| KR20150040306A (en) | 2012-07-30 | 2015-04-14 | 가부시키가이샤 교토 마테리아루즈 | Coating and coated steel |
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| A300 | Withdrawal of application because of no request for examination |
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