JPS5935667A - Surface treatment of steel pipe - Google Patents
Surface treatment of steel pipeInfo
- Publication number
- JPS5935667A JPS5935667A JP14498182A JP14498182A JPS5935667A JP S5935667 A JPS5935667 A JP S5935667A JP 14498182 A JP14498182 A JP 14498182A JP 14498182 A JP14498182 A JP 14498182A JP S5935667 A JPS5935667 A JP S5935667A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- base material
- steel
- layer
- welded
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、軟鋼材からなる鋼管のＮ１浸透法による表
面処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for surface treatment of a steel pipe made of mild steel by N1 infiltration method.
軟鋼材からなる鋼管は、加工かしやすく価格はβ価であ
るが、耐食性、耐摩耗性等に劣るため、通常金属メッキ
で表面処理して使用している。ところがＮ：ｌ 、 Ｃ
ｕ等Ｆｅより責る金属のメッキではピンホールがある場
合（特にメッキ後溶接して電縫鋼管とするときはピンホ
ールが多数発生する）赤錆か発生しやすい。一方、Ｚｌ
’１ ′４ｐ”ｅより卑な金属のメッキでは犠牲腐蝕に
よりメッキが溶は出し、食品輸送用パイプ等には不適で
ある。Steel pipes made of mild steel are easy to process and have a beta value, but they have poor corrosion resistance, wear resistance, etc., so they are usually surface-treated with metal plating before use. However, N:l, C
When plating metals that are more sensitive than Fe, such as u, if there are pinholes (particularly when welding after plating to make an electric resistance welded steel pipe, many pinholes occur), red rust is likely to occur. On the other hand, Zl
Plating with a metal baser than '1'4p''e will cause the plating to melt due to sacrificial corrosion, making it unsuitable for food transportation pipes, etc.
この発明は、上記にかんがみて、赤錆や犠牲ＩＭ蝕の発
生を防止できしかも低コストである鋼管の表面処理方法
を提供することを目的とする。In view of the above, an object of the present invention is to provide a surface treatment method for steel pipes that can prevent the occurrence of red rust and sacrificial IM corrosion and is inexpensive.
この発明の鋼管の表面処理方法は、内外周１ｎ１又はそ
れらの一方に０５〜７０μｍのＮ１層が形成された軟函
材からなる鋼管を還元ガス昇囲気中、ｇＯＯ〜／１００
°ｅｘｔ分以上の条件で加熱処理全以上い鋼管母材表向
にＮｉの拡散層を形成させることにより上記目的を達成
する。The method for surface treatment of steel pipes according to the present invention is to treat a steel pipe made of a soft box material with an N1 layer of 05 to 70 μm formed on the inner and outer circumferences 1n1 or one of them to a temperature of gOO~/100 in a reducing gas atmosphere.
The above object is achieved by forming a Ni diffusion layer on the surface of the steel pipe base material through the entire heat treatment under conditions of at least 100°C.
以下、この発明の方法を図例に基づいて詳細に説明する
。Hereinafter, the method of the present invention will be explained in detail based on illustrated examples.
ここでは電縫鋼管を例に採り説明するが、これに限られ
ることなく、継目無鋼管にも勿論適用可能である。Although the explanation will be given here by taking an electric resistance welded steel pipe as an example, the present invention is not limited thereto, and can of course be applied to seamless steel pipes.
（１）軟鋼材からなる帯鋼板ｌの両面に、電気メツキ法
、溶射法、熔融メッキ法等によってＮｉ層コを形成する
（第７図）。このとキ、Ｎｉ層の厚みはθｓ−１５−１
Ｏｐ’ｆ、しく ｎ ／ 〜！；ｔｔｍとする。０．３
ｐｍ未満では十分な深さのＮ１−の拡散Ｊ？ｆが得られ
ず、また７０μｍを超えるとＮ１使用量が多くなるとと
もに形成時間も長くなりコスト的メリットがなくなる（
２）上記ＭＪ會２が形成された帯鎮板／の両側をエツジ
スカーフィング後、成形工程を経て高周波誘導溶接法又
は低周波抵抗溶接法により溶接を行なって電縫１ｉｌｌ
ｌｌ管３とする（第２図）。なお図例中点線部位は溶接
部位Ａである。(1) Ni layers are formed on both sides of a steel strip plate l made of mild steel by electroplating, thermal spraying, hot-dip plating, etc. (FIG. 7). In this case, the thickness of the Ni layer is θs-15-1
Op'f, Shiku n / ~! ;ttm. 0.3
Diffusion of N1- to a sufficient depth below pm J? f cannot be obtained, and if it exceeds 70 μm, the amount of N1 used increases and the formation time becomes longer, so there is no cost advantage (
2) After edge-scarfing both sides of the band plate/on which the MJ assembly 2 is formed, welding is performed by high-frequency induction welding or low-frequency resistance welding through a forming process to create 1ill of electric resistance welding.
ll tube 3 (Fig. 2). Note that the dotted line area in the figure is the welding area A.
（３）上記電１４画筆１３を焼鈍炉に専き、還元ガス又
は不活性ガス雰囲気、ざ００〜／１００′ＣＸｊ分以上
の条件で加熱処理を行ない、鋼管母材／の表面にＮ１拡
散ｊｆｊ！； （）・ツチ交叉部）を形成させる（線
第３〜ｔＩ図）。なお、第１図の二点鎖Ｂはｗ４管母八
材／とＮ１層−の境界を示す。このとき、力１１熱温度
（副管表面温度）がざＯＯ°Ｃ未満では拡散に時間を要
し実用的でなく、１１００′Ｃを超えると鋼管母材が劣
化するおそれがありさらには加熱設備も高価となる。ま
た加熱時間は上記の通りであるが通常Ｎｉ拡散層５の深
さが３ｐｍ以上となるように設定する。上記還元ガスと
してはＬＰＧ分解ガス、ＮＨＩＩ分解ガス等、不活性ガ
スとしてけＮ２．Ａｒ等それぞれ例示できる。(3) The above electric brush 14 is heated in an annealing furnace in a reducing gas or inert gas atmosphere for a time of 00 to 100 minutes or more to diffuse N1 onto the surface of the steel pipe base material. ! ; ()・Tsuchi intersection) is formed (line 3 to tI figure). Note that the double-dot chain B in FIG. 1 indicates the boundary between the W4 tube matrix material and the N1 layer. At this time, if the heat temperature (auxiliary pipe surface temperature) is less than 100°C, diffusion will take time and it is not practical; if it exceeds 1100'C, the steel pipe base material may deteriorate, and heating equipment It is also expensive. The heating time is as described above, but is usually set so that the depth of the Ni diffusion layer 5 is 3 pm or more. The reducing gas may be an inert gas such as LPG decomposition gas or NHII decomposition gas. Examples include Ar and the like.
上記のようにこの発明の方法で衣ｍｊ焙処理行なった軟
鋼材からなる鋼管は、鋼管母材表面にＦｅにＮ１が固溶
し、表面側に向って漸時Ｎｉ１Ｊツチの母材と一体とな
った拡散層を有するので下記のような効果を奏する。As mentioned above, in a steel pipe made of mild steel subjected to coating heat treatment by the method of the present invention, N1 is dissolved in Fe on the surface of the steel pipe base material, and gradually becomes integrated with the base material of Ni1J toward the surface side. Since it has a diffusion layer of
（ａ）表面側がＮｉリッチであり、優れた耐食性、耐摩
耗性を有する。即ちＮｉはＦｅより責な金属であり儀牲
腐蝕は発生しないことは勿瞼、鋼管形成のための溶接前
のＮ１層の一般部に又は溶接部（ビード部）にビーホー
ルがあってもＮｉ層の拡散によりほとんど消失してしま
い耐食性が著しく向上する。(a) The surface side is rich in Ni and has excellent corrosion resistance and wear resistance. In other words, Ni is a more dangerous metal than Fe, and it goes without saying that sacrificial corrosion will not occur, but even if there is a beehole in the general part of the N1 layer before welding to form a steel pipe or in the welded part (bead part), Ni Almost all of it disappears due to layer diffusion, resulting in a marked improvement in corrosion resistance.
（ｂ）Ｎｉ拡散層は鋼管の衣層部のみでかつ鋼管母材と
の境界部が不鮮明な形で母材と一体化されており、フレ
ア・絞り加工のような強度加工を行なっても金属メッキ
層のようにクラック等が発生ずることなく、加工性も表
面処理前の軟９１剋・Ｃ（同（（良好である。(b) The Ni diffusion layer is only in the coating layer of the steel pipe and is integrated with the base material in a way that the boundary with the steel pipe base metal is unclear. Unlike a plated layer, cracks do not occur, and the workability is good even before surface treatment.
（０）この発明の処理方法は、従来の電縫鋼管製造ライ
ンに、Ｎｉ層形成工程、例えば電気メッキエ梶のみを加
えるだけでよく（拡散工程は従来の焼釉工梶で兼ねる）
、きわめて低コストで鋼管の耐食性等を大幅に向上で自
る。(0) The treatment method of the present invention requires only adding a Ni layer forming step, such as an electroplating step, to a conventional electric resistance welded steel pipe production line (the conventional baking and glazing step also serves as the diffusion step).
The corrosion resistance of steel pipes can be greatly improved at extremely low cost.
なお、上記のような効果を奏するので、この発明の方法
で表…ｉ処理した鋼管は、耐食性が要求され複雑な曲げ
〃Ｉノ工、端末加工等が必要であるガソホール用自動車
燃料配管に好適である。ステンレスオ弓管は曲げ加工性
が良好でなくしかも高価であるため不適である。In addition, since the above-mentioned effects are achieved, the steel pipe treated by the method of the present invention is suitable for automobile fuel piping for gasohol, which requires corrosion resistance and requires complicated bending, end processing, etc. It is. Stainless steel bow tubes are not suitable because they do not have good bending properties and are expensive.
次に、この発明の効果を確認するために行なった耐食性
試験の結果を第１衣に示す。Next, the results of a corrosion resistance test conducted to confirm the effects of this invention are shown in the first coat.
（試験方法）
板厚０７闘の軟鋼板（ｓＰｃｃ）の両面に′＊、気メツ
メツキり厚み２１１ｍのＮｉ層を形成後、慣用手段で亀
ｍ鋼管（φｇ、閃厚θ乙Ｓ間、長さ／２００絹９を製造
し、ワ００ ”ＣＸ ／ Ｏｍｉｎ、還元ｉｆ、囲気中
で加熱処理によりＮｉを拡散させた後、半割にして内周
面のビード部（溶接部）と非ビード部（−股部）につい
て塩水噴霧試験ＣＪ／！；Ｚ２３７／）で評価した。な
お、対比のためにＮ１層を形成し加熱処理を行なわない
ものについても同様の塩水噴霧試験を行なった。(Test method) After forming a Ni layer with a thickness of 211 m on both sides of a mild steel plate (sPcc) with a thickness of 07 mm, a steel pipe (φg, flash thickness θ2, length /200 silk 9 was manufactured, reduced if Ni was diffused by heat treatment in an ambient atmosphere, and then divided in half to separate the beaded part (welded part) and non-beaded part (welded part) on the inner circumferential surface. - crotch) was evaluated by salt water spray test CJ/!;Z237/).For comparison, a similar salt water spray test was also conducted on a product in which an N1 layer was formed and no heat treatment was performed.
第１表
※１）ビード長さ／ ｃｍ当りの赤錆発生数、但しし数
の多い場合は％表示。Table 1 *1) Number of red rust occurrences per cm of bead length. However, if the number is large, it is expressed as a percentage.
※２）／ｃｒＩ当りの赤錆発生数*2) Number of red rust occurrences per crI
図例ばこの発明を示し、第１図はＮｉ層を形成した帯鋼
板の断面図、第２図は第１図の帯鋼板を溶接して形成し
た電縫鋼管の断面図、第３図は第一図の電縫鋼管におけ
る加熱処理後の状態を示す断面図、第１図は第３図の■
部拡大断面図である。
／・・・帯鋼板（鋼管母材）、−・・Ｎｉ層、３・・・
鋼管！・・・Ｎ１拡散層。
特 許 出 願 人
マルヤス工業株式会社
）、・）
第２図For example, the present invention is illustrated in FIG. 1, which is a cross-sectional view of a steel strip with a Ni layer formed thereon, FIG. 2, which is a cross-sectional view of an electric resistance welded steel pipe formed by welding the steel strip shown in FIG. 1, and FIG. A cross-sectional view showing the state of the ERW steel pipe shown in Figure 1 after heat treatment.
FIG. /...Striped steel plate (steel pipe base material), -...Ni layer, 3...
Steel pipe! ...N1 diffusion layer. Patent application: Maruyasu Kogyo Co., Ltd.),・) Figure 2
Claims (1)
形成された軟鋼材からなる鋼管を還元ガス又ｕ不活性ガ
スＷ囲気中、ｆ ＯＯ〜／ ／ ００’Ｃｘ！ｉ分以上
の条件で加熱処理を行ない鋼管母材表向にＮｉ拡散層を
形成させることを特徴とする鋼管の表面処理方法。A steel pipe made of mild steel with an N1 layer of 01 to 70 μm formed on the inner and outer peripheral surfaces or one of them is heated in an atmosphere of reducing gas or u inert gas W f OO ~ / / 00'Cx! A method for surface treatment of a steel pipe, characterized in that a Ni diffusion layer is formed on the surface of a steel pipe base material by performing heat treatment for i minutes or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14498182A JPS5935667A (en) | 1982-08-20 | 1982-08-20 | Surface treatment of steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14498182A JPS5935667A (en) | 1982-08-20 | 1982-08-20 | Surface treatment of steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5935667A true JPS5935667A (en) | 1984-02-27 |
| JPH0215627B2 JPH0215627B2 (en) | 1990-04-12 |
Family
ID=15374699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14498182A Granted JPS5935667A (en) | 1982-08-20 | 1982-08-20 | Surface treatment of steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5935667A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63104684A (en) * | 1986-10-23 | 1988-05-10 | Kansai Paint Co Ltd | Method for coating inside surface of shape steel |
| JPH03202166A (en) * | 1989-12-27 | 1991-09-03 | Alloy Koki Kk | Atomizing apparatus and painting apparatus |
| FR2804130A1 (en) * | 2000-01-26 | 2001-07-27 | Usui Kokusai Sangyo Kk | Steel material includes layer formed by diffusion of nickel in hot-worked material containing non-metallic inclusions |
-
1982
- 1982-08-20 JP JP14498182A patent/JPS5935667A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63104684A (en) * | 1986-10-23 | 1988-05-10 | Kansai Paint Co Ltd | Method for coating inside surface of shape steel |
| JPH03202166A (en) * | 1989-12-27 | 1991-09-03 | Alloy Koki Kk | Atomizing apparatus and painting apparatus |
| FR2804130A1 (en) * | 2000-01-26 | 2001-07-27 | Usui Kokusai Sangyo Kk | Steel material includes layer formed by diffusion of nickel in hot-worked material containing non-metallic inclusions |
| GB2361013A (en) * | 2000-01-26 | 2001-10-10 | Usui Kokusai Sangyo Kk | Nickel diffusion layer in hot worked steel |
| GB2361013B (en) * | 2000-01-26 | 2004-06-16 | Usui Kokusai Sangyo Kk | Steel material of high fatigue strength and a process for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0215627B2 (en) | 1990-04-12 |
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