JPH02228468A - Surface treatment for stainless steel stock - Google Patents
Surface treatment for stainless steel stockInfo
- Publication number
- JPH02228468A JPH02228468A JP4737689A JP4737689A JPH02228468A JP H02228468 A JPH02228468 A JP H02228468A JP 4737689 A JP4737689 A JP 4737689A JP 4737689 A JP4737689 A JP 4737689A JP H02228468 A JPH02228468 A JP H02228468A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- chromium
- layer
- steel material
- coating layer
- 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.)
- Pending
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 64
- 239000010935 stainless steel Substances 0.000 title claims abstract description 64
- 238000004381 surface treatment Methods 0.000 title claims description 7
- 239000010410 layer Substances 0.000 claims abstract description 47
- 239000011247 coating layer Substances 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 88
- 239000011651 chromium Substances 0.000 claims description 76
- 229910052804 chromium Inorganic materials 0.000 claims description 65
- 239000000463 material Substances 0.000 claims description 55
- 239000003973 paint Substances 0.000 claims description 4
- 238000005554 pickling Methods 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 230000002950 deficient Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract 4
- 239000000843 powder Substances 0.000 abstract 3
- 235000011837 pasties Nutrition 0.000 abstract 1
- 239000006104 solid solution Substances 0.000 abstract 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 16
- 229910000423 chromium oxide Inorganic materials 0.000 description 16
- 239000002245 particle Substances 0.000 description 7
- 238000002161 passivation Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000000941 radioactive substance Substances 0.000 description 2
- 101150018425 Cr1l gene Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明はステンレス鋼材ｌ材の表面処理方法に係り、特
に、ステンレス鋼材表面のクロム量を高めるようにした
表面処理方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for surface treatment of stainless steel material, and particularly to a method for surface treatment of increasing the amount of chromium on the surface of stainless steel material.
Ｆ従来の技術Ｊ
一般？こ、ステンレス鋼材の製造プロセスにおいては、
固溶化熱処理の後、表面に形成あるいは付着した酸化ス
ケールを除去する酸洗い処理が行なわれるが、この酸洗
い処理後に、表面のクロム量が低下する現象を生じる。F Conventional technology J General? In the manufacturing process of stainless steel materials,
After the solution heat treatment, a pickling treatment is performed to remove oxide scale formed or attached to the surface, but after this pickling treatment, a phenomenon occurs in which the amount of chromium on the surface decreases.
つまり、固溶化熱処理時において、ステンレス鋼材表面
に比較的厚い酸化スケール層が生じ、酸化スケール層に
おけるクロム酸化物の生成量が多・くなることに基づい
て、Ｃｒ原子が母材表面直下の組織中から酸化スケール
ａ（こ移行することにより、酸化スケール層直下の組織
中のＣｒ１ｌが低下して、酸洗い処理時に酸化スケール
を除去すると、Ｃｒｌの少ない部分が表面に現れること
になる。In other words, during solution heat treatment, a relatively thick oxide scale layer is formed on the surface of the stainless steel material, and based on the fact that the amount of chromium oxide produced in the oxide scale layer increases, Cr atoms are Oxide scale a (by this migration, Cr1l in the structure directly under the oxide scale layer decreases, and when the oxide scale is removed during pickling treatment, a portion with less Crl appears on the surface.
例えば１８−８ステンレス鋼の場合であると、クロム量
が１８％の均一な組織となる筈であるが、固溶化処理と
酸洗い処理とを行なうことによって、表面のクロム量が
８〜１４％程度に低下するものと考えられる。For example, in the case of 18-8 stainless steel, it should have a uniform structure with a chromium content of 18%, but by performing solution treatment and pickling treatment, the chromium content on the surface is reduced to 8 to 14%. It is thought that this will decrease to a certain extent.
従来、ステンレス調材の表面ｌこおひるクロム量を回復
さける方法として、ステンレス鋼材を硝酸雰囲気に長期
間さらす処理を行なうことにより、表面への不働態化被
膜の形成を積極的に行なうことが一部で実施されている
。Conventionally, as a method to avoid recovering the amount of chromium on the surface of stainless steel prepared materials, it has been possible to actively form a passivation film on the surface by exposing the stainless steel material to a nitric acid atmosphere for a long period of time. This is being implemented in some areas.
「発明が解決しようとする課題」
しかしながら、硝酸雰囲気による不働態化処理は、その
処理期間が長期間（例えば数箇月 ）に及ぶことがあり
、処理施設が高価なものとなって経済性が損なわれ易く
汎用性が低い。``Problem to be solved by the invention'' However, passivation treatment using a nitric acid atmosphere can take a long period of time (for example, several months), making treatment facilities expensive and impairing economic efficiency. It is easily damaged and has low versatility.
一方、ステンレス鋼材表面のクロム量が不十分なまま使
用すると、例えば水蒸気中では水蒸気酸化に対する抵抗
が弱くなったり、原子炉系では放射化物質の蓄積量が多
くなる等の悪い影響が生じる。On the other hand, if the stainless steel material is used with an insufficient amount of chromium on its surface, it will have negative effects, such as weakening its resistance to steam oxidation in steam or increasing the amount of radioactive substances accumulated in a nuclear reactor system.
本発明は上記事情に鑑みて提案されたもので、ステンレ
ス鋼材表面のクロム量を高めて耐水蒸気酸化性、耐汚染
性を向上させることを目的とするしのである。The present invention was proposed in view of the above circumstances, and its purpose is to increase the amount of chromium on the surface of a stainless steel material to improve steam oxidation resistance and stain resistance.
「課題を解決するための手段」
上記目的を達成するため、本発明は、ステンレス鋼材表
面の酸化スケール層を除去した後、そのステンレス鋼材
表面にクロム粉末と塗装バインダー七の混合物を塗布し
てクロム塗膜層を形成し、該クロム塗膜層によりステン
レス鋼材表面を空気から遮断した状態で加熱して、クロ
ム塗膜層におけるクロム粉末のクロム原子をステンレス
鋼材表面に移行さ０“てステンレス鋼材表面のクロム量
を増加させることを特徴とするステンレス鋼材の表面処
理方法としている。"Means for Solving the Problems" In order to achieve the above object, the present invention removes the oxide scale layer on the surface of the stainless steel material, and then applies a mixture of chromium powder and paint binder seven to the surface of the stainless steel material to chrome the surface of the stainless steel material. A coating layer is formed, and the surface of the stainless steel material is isolated from the air by the chromium coating layer, and heated, and the chromium atoms of the chromium powder in the chromium coating layer are transferred to the surface of the stainless steel material. This is a method for surface treatment of stainless steel materials, which is characterized by increasing the amount of chromium.
「作用 」
クロム塗膜層を形成する府のステンレス鋼材表面とクロ
ム粒子の表面とには、空気と接触することによって、程
度の差はあるもののクロム酸化物層が生じている。``Operation'' A chromium oxide layer is formed on the surface of the stainless steel material that forms the chromium coating layer and on the surface of the chromium particles due to contact with air, although there are differences in degree.
ステンレスａ材表面にクロム塗膜層を形成すると、ステ
ンレス鋼材表面が空気から遮断されて、クロム酸化物が
Ｃｒと酸素とに分解し易い状態が形成される。この状態
で加熱を行なうと、クロム量が多い部分からクロノ・量
が少ない部分へ、クロム原子が拡散して移行する現象、
つまり、クロム塗膜層のクロム粉末中における量的に多
いＣｒ原子が、量的に少なくなっているステンレス鋼材
表面組織中に移行することにより、ステンレス鋼材表面
近傍の組織中のクロム量が増加し、クロム富化層が形成
される。このクロム富化層に基づき、再度、空気に接触
すると、ステンレス鋼材表面に質の高い不働態化被膜が
形成される。When a chromium coating layer is formed on the surface of the stainless steel material A, the surface of the stainless steel material is shielded from air, creating a state in which chromium oxide is easily decomposed into Cr and oxygen. When heating is performed in this state, chromium atoms diffuse and migrate from areas with a large amount of chromium to areas with a small amount of chromium.
In other words, the quantitatively large amount of Cr atoms in the chromium powder of the chromium coating layer migrates into the stainless steel surface structure, which is quantitatively small, thereby increasing the amount of chromium in the structure near the surface of the stainless steel material. , a chromium-enriched layer is formed. Based on this chromium-enriched layer, a high-quality passivation film is formed on the stainless steel surface when it comes into contact with air again.
「実施例Ｊ
第１図ない１．第４図は、本発明に係るステンレス鋼材
の表面処理方法における実施工程例を示すものである。``Example J'' Figures 1 and 4 show examples of implementation steps in the method for surface treatment of stainless steel materials according to the present invention.
［酸化スケール層除去等の前処理］
ステンレス鋼材の製造プロセスにおいて、固溶化熱処理
後に、ステンレス鋼材を例えば沸酸で洗浄する酸洗い処
理や、ステンレス鋼材に氷粒を噴射するアイスブラスト
処理により、酸化スケール層の除去を行なう。[Pre-treatment for removing oxide scale layer, etc.] In the manufacturing process of stainless steel materials, after solution heat treatment, oxidation is removed by pickling treatment in which the stainless steel material is washed with boiling acid, for example, or ice blasting treatment in which ice particles are injected onto the stainless steel material. Remove the scale layer.
第１図は、酸洗い処理が施されたステンレス鋼材の組織
モデルを示しており、符号ｌは母材、２はクロム欠乏層
、３はクロム酸化層である。FIG. 1 shows a structure model of a stainless steel material subjected to pickling treatment, where 1 is the base material, 2 is the chromium-depleted layer, and 3 is the chromium oxide layer.
ステンレス調材の表面を酸洗い処理した場合で説明する
と、酸化スケール層の除去と表面の活性化とが行なわれ
る結果、前述した１８−８ステンレス鋼を例にとると、
母材１の部分のクロム量は１８％であるが、クロム欠乏
層２の部分は、前述したように、酸化スケール層の形成
時にクロム原子が移行した分だけクロム量が少なくなり
、例えば８％〜１４％となっている可能性を存しており
、クロム酸化層３は、クロムと空気中の酸素との接触に
基づいて生じたＣ ｒ ２０ ｘ等の酸化物により構成
されるが、クロム欠乏層２からクロム原子が移行する現
象により、クロム欠乏層２よりはクロム量が若干多くな
っていると考えられる。To explain the case where the surface of stainless steel prepared material is pickled, the oxide scale layer is removed and the surface is activated.
The amount of chromium in the base material 1 is 18%, but as mentioned above, the amount of chromium in the chromium-depleted layer 2 decreases by the amount of chromium atoms transferred during the formation of the oxide scale layer, for example, 8%. The chromium oxide layer 3 is composed of oxides such as C r 20 x produced by contact between chromium and oxygen in the air. It is considered that the amount of chromium is slightly larger than that in the chromium-depleted layer 2 due to the phenomenon in which chromium atoms migrate from the chromium-depleted layer 2.
Ｕクロム塗膜層の形成］
次いで、第２図に示す組織モデルを示すように、前記ス
テンレス鋼材の表面に、クロム粉末と塗装バインダー（
例えば有機溶剤、油脂など）とを混合してなるペースト
状の混合物を塗布することにより、クロム塗膜層４を形
成する。Formation of U chromium coating layer] Next, as shown in the structure model shown in FIG. 2, chromium powder and coating binder (
For example, the chromium coating layer 4 is formed by applying a paste-like mixture formed by mixing the chromium coating layer 4 with organic solvents, oils and fats, etc.).
この場合において、ステンレス鋼材表面には、り〔Ｊム
酸化層３が形成されており、また、クロム塗膜層４に含
まれるクロム粉末のクロム粒子の表面も、塗装バインダ
ーとの混合面に空気と接触することによって、程度の差
はあるもののクロム酸化物層が生じている。In this case, a rim oxide layer 3 is formed on the surface of the stainless steel material, and the surface of the chromium particles of the chromium powder contained in the chromium coating layer 4 is also air-filled on the surface of the chromium powder mixed with the paint binder. A chromium oxide layer is formed to varying degrees by contact with the chromium oxide.
また、ステンレス鋼材表面にクロム塗膜層４を形成した
状態であると、ステンレス鋼材表面のクロム酸化層３が
空気から遮断されて、クロム酸化層３を構成しているク
ロム酸化物が空気（酸素）の無い雰囲気に保持され、Ｃ
ｒと酸素とに分解し易い状態が形成される。In addition, when the chromium coating layer 4 is formed on the surface of the stainless steel material, the chromium oxide layer 3 on the surface of the stainless steel material is blocked from air, and the chromium oxide constituting the chromium oxide layer 3 is exposed to the air (oxygen ) is maintained in an atmosphere without C
A condition is formed in which it is easy to decompose into r and oxygen.
［［クロム塗膜層の加熱］
クロム塗膜層４によって、ステンレスＭ材表面を空気か
ら遮断した状態としたまま、ステンレス鋼材表面を例え
ば５００℃〜６００℃の温度で加熱する。なお、この加
熱工程では、後述するようにＣｒ原子を短時間で拡散移
行させる目的のため、前述の温度やステンレス鋼材の溶
融温度（絶対温度）のほぼ１／２程度の温度に設定され
る。[[Heating of Chromium Coating Layer] The surface of the stainless steel M material is heated at a temperature of, for example, 500° C. to 600° C. while keeping the surface of the stainless steel M material shielded from air by the chromium coating layer 4. In this heating step, the temperature is set to approximately 1/2 of the above-mentioned temperature or the melting temperature (absolute temperature) of the stainless steel material in order to diffuse and transfer Cr atoms in a short time as described later.
［Ｃｒ原子の拡散移行］
ステンレス調材表面を空気から遮断した状態で加熱を行
なうと、クロム量が多い部分からクロム量が少ない部分
へ、クロム原子が拡散して移行する現象が生じる。つま
り、クロム塗膜層４のクロム粉末（クロム粒子）は、ス
テンレス鋼材表面が例えばクロム１８％であるのに比較
して、クロム量が非常に多くなっていることに加え、空
気遮断状態とすることによって、Ｃｒ原子が移動し易い
状態に保持されているために、第３図に各矢印で示すよ
うに、量的に多いＣｒ原子が、量的に少なくなっている
部分に拡散移行する現象が生じ易くなり、クロム塗膜層
４におけるクロム粉末のＣｒ原子が、クロム酸化層３お
よびクロム欠乏層２に拡散して移行する。一方、母材Ｉ
の中においても、高温状態とされることにより、Ｃｒ原
子がクロム欠乏層２に拡散移行する現象が生じ、ステン
レス鋼材表面近傍の組織、クロム欠乏層２及びクロム酸
化層３の組織中のクロム量が増加し、当初のクロム欠乏
層２及びクロム酸化層３のクロム量が、例えば２０％程
度にまで高められて、第４図に示すように、クロム富化
状態のいわゆるクロム富化層２１３・３Ｂが形成される
。[Diffusion and Transfer of Cr Atoms] When the stainless steel surface is heated while being shielded from air, a phenomenon occurs in which chromium atoms diffuse and transfer from areas with a large amount of chromium to areas with a small amount of chromium. In other words, the chromium powder (chromium particles) in the chromium coating layer 4 has a much higher amount of chromium than, for example, 18% chromium on the stainless steel surface, and in addition, it is in an air-blocked state. As a result, Cr atoms are kept in a state where they are easy to move, and as shown by the arrows in Figure 3, a phenomenon occurs in which Cr atoms, which are larger in quantity, diffuse into areas where they are smaller. is likely to occur, and Cr atoms of the chromium powder in the chromium coating layer 4 diffuse and migrate to the chromium oxide layer 3 and the chromium-deficient layer 2. On the other hand, base material I
Among these, due to high temperature conditions, a phenomenon occurs in which Cr atoms diffuse into the chromium-depleted layer 2, and the amount of chromium in the structure near the surface of the stainless steel material, the chromium-depleted layer 2, and the chromium oxide layer 3 increases. increases, and the initial chromium content of the chromium-depleted layer 2 and chromium oxide layer 3 is increased to, for example, about 20%, and as shown in FIG. 3B is formed.
一方、クロム塗膜層４に含まれていた塗装ノ（インダー
は、例えば有機溶剤、油脂などであるために、加熱によ
って気化あるいは分解されて、ステンレス鋼材表面から
次第に消滅し、第４図に示すように、加熱工程の終期に
は、クロム粉末の一部が残留クロム粒子層５として残さ
れる。この残留クロム粒子層５は、適宜必要に応じて拭
い取ること等により除去される。On the other hand, since the paint (inner) contained in the chrome coating layer 4 is, for example, an organic solvent, oil, etc., it is vaporized or decomposed by heating and gradually disappears from the surface of the stainless steel material, as shown in Fig. 4. Thus, at the end of the heating process, a portion of the chromium powder remains as a residual chromium particle layer 5. This residual chromium particle layer 5 is removed by wiping or the like as appropriate.
「良質不働態化被膜の形成」
第４図に示すように、ステンレス調材表面に、両クロム
富化層２Ｂ・３Ｂが形成された状態で、その後ステンレ
ス鋼材表面か空気に接触すると、両クロム富化層２Ｂ・
３Ｂがクロム酸化物となり、ステンレス鋼材表面に質の
高い不働態化被膜が形成される。"Formation of a high-quality passivation film" As shown in Figure 4, when both chromium-enriched layers 2B and 3B are formed on the surface of the stainless steel material, when the surface of the stainless steel material comes into contact with air, both chromium-enriched layers 2B and 3B are Enriched layer 2B・
3B becomes chromium oxide, and a high quality passivation film is formed on the surface of the stainless steel material.
一方、ステンレス鋼材に塗布したクロム塗膜層４を加熱
する他の手段（方法）として、レーザを照射し、クロム
塗膜層４に含まれるクロム粉末を溶融状態にしてコーテ
ィングするとともに、・くインダーを気化させることに
より、ステンレス鋼材の表面にクロム富化層を強制的に
形成し、必要に応じて表面研磨を行なう等の処理を施す
ようにしてもよい。On the other hand, as another means (method) for heating the chromium coating layer 4 applied to stainless steel material, laser is irradiated to melt the chromium powder contained in the chromium coating layer 4 and coat it. By vaporizing the stainless steel material, a chromium-enriched layer may be forcibly formed on the surface of the stainless steel material, and if necessary, a treatment such as surface polishing may be performed.
「発明の効果Ｊ
以上の説明で明らかなように、本発明によれば、ステン
レス鋼材表面にクロム塗膜層を形成することにより、ス
テンレス調材表面を空気から遮断し、クロム酸化物がＣ
ｒと酸素とに分解（７易い状態として加熱を行なうもの
であるために、クロム粉末中のＣｒ原子がステンレス鋼
材表面組織中に拡散移行する現象の促進が行なわれ、ス
テンレス鋼材表面近傍の組織中のクロム量を増加させた
クロム富化層とし、ステンレス鋼材表面に質の高い不働
態化被膜を形成することができる。"Effect of the Invention J As is clear from the above explanation, according to the present invention, by forming a chromium coating layer on the surface of stainless steel material, the surface of the stainless steel material is shielded from air, and chromium oxide is
Since heating is performed in a state where it is easy to decompose into r and oxygen, the phenomenon of diffusion and transfer of Cr atoms in the chromium powder into the surface structure of the stainless steel material is promoted, and the Cr atoms in the structure near the surface of the stainless steel material are accelerated. A chromium-enriched layer with an increased amount of chromium can form a high-quality passivation film on the surface of stainless steel.
したがって、例えば配管材料として使用した場合に、ス
テンレス鋼材の水蒸気酸化を防止し、がつ、放射性物質
堆積による汚染を防止することができるという効果を奏
する。Therefore, when used as a piping material, for example, it is possible to prevent steam oxidation of the stainless steel material and to prevent contamination due to radioactive substance accumulation.
第１図ないし第４図は、本発明に係るステンレス鋼材の
表面処理方法における実施工程例を示す要部の組織モデ
ル図である。
ｌ・・・・・・母材、
２・・・・・・クロム欠乏層、
２Ｂ・・・・・・クロム富化層、
３・・・・・・クロム酸化層、
３Ｂ・・・・・クロム富化層、
４・・・・・・クロム塗膜層、
５・・・・・・残留クロム粒子層。1 to 4 are structural model diagrams of essential parts showing examples of implementation steps in the method for surface treatment of stainless steel materials according to the present invention. 1...Base material, 2...Chromium-deficient layer, 2B...Chromium-enriched layer, 3...Chromium oxide layer, 3B... Chromium-enriched layer, 4...Chromium coating layer, 5...Residual chromium particle layer.
Claims (1)
のステンレス鋼材表面にクロム粉末と塗装バインダーと
の混合物を塗布してクロム塗膜層を形成し、該クロム塗
膜層によりステンレス鋼材表面を空気から遮断した状態
で加熱して、クロム塗膜層におけるクロム粉末のクロム
原子をステンレス鋼材表面に移行させてステンレス鋼材
表面のクロム量を増加させることを特徴とするステンレ
ス鋼材の表面処理方法。After removing the oxide scale layer on the surface of the stainless steel material, a mixture of chromium powder and paint binder is applied to the surface of the stainless steel material to form a chrome coating layer, and the chrome coating layer blocks the surface of the stainless steel material from air. 1. A method for surface treatment of a stainless steel material, which comprises heating the chromium powder in a chromium coating layer to transfer chromium atoms of chromium powder to the surface of the stainless steel material, thereby increasing the amount of chromium on the surface of the stainless steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4737689A JPH02228468A (en) | 1989-02-28 | 1989-02-28 | Surface treatment for stainless steel stock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4737689A JPH02228468A (en) | 1989-02-28 | 1989-02-28 | Surface treatment for stainless steel stock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02228468A true JPH02228468A (en) | 1990-09-11 |
Family
ID=12773379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4737689A Pending JPH02228468A (en) | 1989-02-28 | 1989-02-28 | Surface treatment for stainless steel stock |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02228468A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007038251A (en) * | 2005-08-02 | 2007-02-15 | Honda Motor Co Ltd | Die for forging and producing method therefor |
| WO2008023410A1 (en) * | 2006-08-23 | 2008-02-28 | Nkk Tubes | Austenite-base stainless steel pipe, for boiler, having excellent high-temperature steam oxidation resistance |
| JP2009179884A (en) * | 2009-05-18 | 2009-08-13 | National Institute For Materials Science | Heat-resistant ferritic steel |
| JP2015006696A (en) * | 2004-08-02 | 2015-01-15 | エイティーアイ・プロパティーズ・インコーポレーテッド | Method for replacing corroded fluid conducting parts in equipment by welding and parts obtained thereby |
| US10118259B1 (en) | 2012-12-11 | 2018-11-06 | Ati Properties Llc | Corrosion resistant bimetallic tube manufactured by a two-step process |
-
1989
- 1989-02-28 JP JP4737689A patent/JPH02228468A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015006696A (en) * | 2004-08-02 | 2015-01-15 | エイティーアイ・プロパティーズ・インコーポレーテッド | Method for replacing corroded fluid conducting parts in equipment by welding and parts obtained thereby |
| US9662740B2 (en) | 2004-08-02 | 2017-05-30 | Ati Properties Llc | Method for making corrosion resistant fluid conducting parts |
| JP2007038251A (en) * | 2005-08-02 | 2007-02-15 | Honda Motor Co Ltd | Die for forging and producing method therefor |
| WO2008023410A1 (en) * | 2006-08-23 | 2008-02-28 | Nkk Tubes | Austenite-base stainless steel pipe, for boiler, having excellent high-temperature steam oxidation resistance |
| US8034198B2 (en) | 2006-08-23 | 2011-10-11 | Nkk Tubes | Austenitic stainless steel tube for boiler with excellent resistance to high temperature steam oxidation |
| JP2009179884A (en) * | 2009-05-18 | 2009-08-13 | National Institute For Materials Science | Heat-resistant ferritic steel |
| US10118259B1 (en) | 2012-12-11 | 2018-11-06 | Ati Properties Llc | Corrosion resistant bimetallic tube manufactured by a two-step process |
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