JP4423273B2 - Steel pipe with excellent corrosion resistance and method for producing the same - Google Patents

Steel pipe with excellent corrosion resistance and method for producing the same Download PDF

Info

Publication number
JP4423273B2
JP4423273B2 JP2006186782A JP2006186782A JP4423273B2 JP 4423273 B2 JP4423273 B2 JP 4423273B2 JP 2006186782 A JP2006186782 A JP 2006186782A JP 2006186782 A JP2006186782 A JP 2006186782A JP 4423273 B2 JP4423273 B2 JP 4423273B2
Authority
JP
Japan
Prior art keywords
steel pipe
corrosion resistance
alloy
plated
plating
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 - Fee Related
Application number
JP2006186782A
Other languages
Japanese (ja)
Other versions
JP2007070725A (en
Inventor
ギ ヒョウ キム
スン チャン キム
ジェ ピョン シム
Original Assignee
コーリア バンディ カンパニー リミテッド
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=37387310&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JP4423273(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by コーリア バンディ カンパニー リミテッド filed Critical コーリア バンディ カンパニー リミテッド
Publication of JP2007070725A publication Critical patent/JP2007070725A/en
Application granted granted Critical
Publication of JP4423273B2 publication Critical patent/JP4423273B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0035—Means for continuously moving substrate through, into or out of the bath
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • C23C2/00361—Crucibles characterised by structures including means for immersing or extracting the substrate through confining wall area
    • C23C2/00362—Details related to seals, e.g. magnetic means
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • B05D2350/65—Adding a layer before coating metal layer

Description

耐食性に優れた鋼管及びその製造方法（Steel tube having improved corrosion-resistance and method for manufacturing the same）
本発明は、鋼管(steel tube)の製造に関し、より詳しくは改善された耐食性を提供する表面処理構造を有する鋼管及びその製造方法に関する。 Steel tube having improved corrosion-resistance and method for manufacturing the same
The present invention relates to the manufacture of steel tubes, and more particularly, to a steel pipe having a surface treatment structure that provides improved corrosion resistance and a method of manufacturing the same.

一般的に鋼管(steel tube)を製造する方法には、射出方式による生産方法と鋼板をチューブ形態で加工する方法があるが、射出方法による生産方法は製造単価が高く、鋼板を用いた加工方法が多く利用されている。
後者の方式による鋼管の製造方法は、鋼板をチューブ形態に変形し、接触面を電気抵抗溶接法で溶接して加工するため、電継管ともいう。
このような電継管の製造方法は、その口径が小さいものから大きいものに至るまで、ほとんどの鋼管の製造方法に用いられている実情である。上記のように製造された小口径の鋼管は、冷蔵庫等のような冷却機器のコンデンサー、ブレーク油圧ラインなどのように耐久性と信頼性が求められる用途で多く使用されている。従って、高い耐久性と信頼性の求められる小口径の鋼管は、その製造工程から細密に管理されなければならない特性を有している。
一方、このような小口径鋼管の表面腐食を防止するために、より効果的な表面処理技術に関する研究が進行されつつある。 In general, methods for manufacturing steel tubes include a production method by an injection method and a method of processing a steel plate in a tube form, but the production method by the injection method is expensive in manufacturing cost, and a processing method using a steel plate Is widely used.
The method of manufacturing a steel pipe by the latter method is also called a relay pipe because the steel sheet is deformed into a tube shape and the contact surface is welded and processed by an electric resistance welding method.
Such a method of manufacturing a relay pipe is a fact that is used in almost all methods of manufacturing a steel pipe, from a small diameter to a large diameter. Small-diameter steel pipes manufactured as described above are often used in applications that require durability and reliability, such as condensers for cooling equipment such as refrigerators, break hydraulic lines, and the like. Therefore, a small-diameter steel pipe that is required to have high durability and reliability has characteristics that must be closely controlled from the manufacturing process.
On the other hand, in order to prevent the surface corrosion of such a small diameter steel pipe, research on a more effective surface treatment technique is being advanced.

本発明は、上記のような問題点を解決するためのものであって、本発明は耐食性に優れるように表面処理された鋼管及びその製造方法を提供することを目的とする。   This invention is for solving the above problems, and this invention aims at providing the steel pipe surface-treated so that it may be excellent in corrosion resistance, and its manufacturing method.

上記の目的を達成するために、本発明に係る耐食性に優れる鋼管の製造方法は、造管過程により形成された鋼管を予熱する第1段階；上記の予熱された鋼管の温度を所定の温度以上に維持させ、還元雰囲気を提供する第2段階；55質量%のアルミニウムと43.4〜44.9質量%の亜鉛を含む合金を溶融させ、上記の溶融された合金を上記鋼管の表面にメッキする第3段階；上記の鋼管を冷却させる第4段階；及び、上記鋼管の表面に樹脂をコーティングする第5段階を含んで行われる。
ここで、上記の合金は0.1〜1.6質量%のシリコンを更に含んでなることが好ましい。そして、上記の第3段階で、上記の鋼管は上記の溶融された合金が貯蔵されたメッキ部を垂直上方に通過されながらメッキされ、上記鋼管の表面にメッキされた合金の厚さを調節するために、上記の鋼管に向かってガスが噴射されることが好ましい。
また、上記メッキ部の下部には、上記の通過される鋼管とメッキ部の間に溶融された合金が下側に流出されないように、圧力調節装置により大気圧より高い圧力が加えられることが好ましい。 In order to achieve the above object, a method of manufacturing a steel pipe excellent in corrosion resistance according to the present invention includes a first stage of preheating a steel pipe formed by a pipe making process; the temperature of the preheated steel pipe is equal to or higher than a predetermined temperature. A second stage of maintaining a reduced atmosphere and providing a reducing atmosphere; a third stage of melting an alloy containing 55 wt% aluminum and 43.4 to 44.9 wt% zinc and plating the molten alloy on the surface of the steel pipe A fourth stage of cooling the steel pipe; and a fifth stage of coating the surface of the steel pipe with a resin.
Here, it is preferable that the alloy further contains 0.1 to 1.6% by mass of silicon. Then, in the third step, the steel pipe is plated while passing vertically through the plated portion where the molten alloy is stored, and the thickness of the alloy plated on the surface of the steel pipe is adjusted. Therefore, it is preferable that the gas is injected toward the steel pipe.
Further, it is preferable that a pressure higher than the atmospheric pressure is applied to the lower portion of the plated portion by a pressure adjusting device so that the alloy melted between the steel pipe to be passed through and the plated portion does not flow downward. .

さらに、上記第2段階における還元雰囲気の組成は、水素及び窒素の混合ガスを上記鋼管の周囲に投入することにより行われることが好ましい。
そして、上記第4段階は、上記のメッキされた鋼管に空気を送風する段階；及び冷却水を用いて上記の鋼管をクェンチング(quenching)する段階を含んで行われることが好ましい。又、上記第5段階の前処理過程として3価クロメート処理(chromating)工程が行われることが好ましい。
さらに、上記第5段階で無色のナイロン樹脂が上記鋼管の表面にコーティングされることが好ましい。
前述された上記の製造方法で製造された鋼管は、均一な表面状態と向上した耐食性を提供する。
一方、上記の目的を達成するために、本発明に係る耐食性に優れた鋼管は、内部に流体が流れるように成っている鋼管；及び上記鋼管の外面に55質量%のアルミニウムと43.4〜44.9質量%の亜鉛を含む合金でメッキされたメッキ層を含んでなる。 Further, the composition of the reducing atmosphere in the second stage is preferably performed by introducing a mixed gas of hydrogen and nitrogen around the steel pipe.
Preferably, the fourth step includes a step of blowing air to the plated steel pipe; and a step of quenching the steel pipe using cooling water. Moreover, it is preferable that a trivalent chromating process is performed as the pretreatment process of the fifth stage.
Furthermore, it is preferable that a colorless nylon resin is coated on the surface of the steel pipe in the fifth step.
The steel pipe manufactured by the above-described manufacturing method provides a uniform surface state and improved corrosion resistance.
On the other hand, in order to achieve the above object, a steel pipe excellent in corrosion resistance according to the present invention includes a steel pipe configured to allow fluid to flow therein; and 55 mass% aluminum and 43.4 to 44.9 mass on the outer surface of the steel pipe. A plating layer plated with an alloy containing% zinc is included.

ここで、上記の合金は0.1〜1.6質量%のシリコンをさらに含んでなることが好ましい。
上記メッキ層の表面は、3価クロメート処理されることが好ましい。
また、上記メッキ層の表面にはナイロン樹脂がコーティングされることが好ましい。
一方、本発明に係る耐食性に優れる鋼管の製造装置は、造管過程により形成された鋼管を予熱する予熱装置；上記の予熱された鋼管の温度を所定の温度以上に維持させ、還元雰囲気を提供する前処理装置(pre-treating apparatus)；アルミニウムと亜鉛を含む合金を溶融させる加熱源として提供されるヒーターと、上記の鋼管が通過する経路に、上記の溶融された合金が上記鋼管の表面にメッキされるように配置されたメッキ部が提供され、内部に上記の溶融された合金が貯蔵されるポットを含むメッキ装置；及び上記のメッキされた鋼管の外面に合成樹脂を塗布する樹脂塗布装置を含んでなる。 Here, the alloy preferably further includes 0.1 to 1.6 mass% of silicon.
The surface of the plating layer is preferably subjected to trivalent chromate treatment.
The surface of the plating layer is preferably coated with nylon resin.
On the other hand, a steel pipe manufacturing apparatus with excellent corrosion resistance according to the present invention is a preheating apparatus for preheating a steel pipe formed by a pipe making process; the temperature of the preheated steel pipe is maintained at a predetermined temperature or more, and a reducing atmosphere is provided. A pre-treating apparatus; a heater provided as a heating source for melting an alloy containing aluminum and zinc; a path through which the steel pipe passes; and the molten alloy on the surface of the steel pipe. A plating apparatus provided with a plating portion arranged to be plated and storing the molten alloy therein; and a resin coating apparatus for applying a synthetic resin to the outer surface of the plated steel pipe Comprising.

ここで、上記の鋼管が通過する経路は実質的に垂直に配置され、上記垂直方向の上段及び下段には、それぞれ上記鋼管の移動を案内する上部及び下部ガイドローラーが提供されることが好ましい。
そして、上記メッキ部の下部には、上記の通過される鋼管とメッキ部の間に溶融された合金が下側に流出されないように、大気圧より高い圧力を加える圧力調節装置が提供されることが好ましい。
また、上記メッキ部の上側に配置され、上記の鋼管にメッキされる合金の厚さを調節するように、ガスを噴射する上部ノズル装置をさらに含んでなることが好ましい。
上記溶融された合金のレベルを調節するように、上記溶融された合金中に選択的に挿入されるレベルブロックをさらに含んでなることが好ましい。
上記の前処理装置は表面が保温処理され、内部に沿って上記の鋼管が貫通するように配置された少なくとも一つ以上のチューブ；上記のチューブに取り付けられて熱を発生させるセラミックヒーター；及び上記チューブの内部に窒素及び水素の混合ガスを注入させるガス注入装置を含んでなることが好ましい。
本発明の特徴及び長所は、後述する本発明の実施例の詳細な説明と共に、添付する図面を参考にすると更によく理解することができる。 Here, it is preferable that the path through which the steel pipe passes is arranged substantially vertically, and upper and lower guide rollers for guiding the movement of the steel pipe are provided in the upper and lower stages in the vertical direction, respectively.
A pressure adjusting device for applying a pressure higher than the atmospheric pressure is provided at a lower portion of the plated portion so that an alloy melted between the steel pipe to be passed through and the plated portion does not flow downward. Is preferred.
In addition, it is preferable to further include an upper nozzle device that injects gas so as to adjust the thickness of the alloy that is disposed on the upper side of the plating portion and is plated on the steel pipe.
Preferably, it further comprises a level block that is selectively inserted into the molten alloy so as to adjust the level of the molten alloy.
The pretreatment device has a heat-treated surface and at least one or more tubes arranged so that the steel pipe penetrates along the inside; a ceramic heater attached to the tube to generate heat; and the above It is preferable to include a gas injection device for injecting a mixed gas of nitrogen and hydrogen into the tube.
The features and advantages of the present invention may be better understood with reference to the accompanying drawings, as well as the following detailed description of embodiments of the invention.

以下、上記の目的が具体的に実現できる本発明の好ましい実施例を、添付の図面を参照にして説明する。本実施例を説明することにおいて、同一構成に対しては同一名称及び同一符号が用いられ、これによる付加的な説明は下記では省略する。
以下、添付の図面を参照にして、本発明の好ましい実施例による耐食性に優れた鋼管及びその製造方法を説明すると、次の通りである。
図１は、本発明の一つの実施例による耐食性に優れた鋼管の製造装置の概略的な構成図である。
図１で示されるように、造管過程により製造された鋼管は、コイラー装置によりコイル状に巻かれた状態で本実施例による装置に搬入されることが好ましい。即ち、上記の造管過程は、別途のラインで行われることが好ましい。
上記の鋼管製造装置に搬入された鋼管(1)は、アンコイラー装置(3)により直線形に広がった後、化学的処理装置(5)により、上記鋼管の表面に種々の酸液または界面活性剤を組み合わせた液を用いて、化学的に処理されることが好ましい。この際、上記の鋼管表面の異物は除去される。又、上記の化学処理の後には、高速に回転されるワイヤブラシ等により、鋼管の表面に付着した酸化異物が物理的に除去できるようにすることが好ましい。次いで、水及び空気を用いて鋼管の表面が洗浄される。 Hereinafter, preferred embodiments of the present invention in which the above object can be specifically realized will be described with reference to the accompanying drawings. In the description of the present embodiment, the same name and the same reference numeral are used for the same configuration, and additional description thereof will be omitted below.
Hereinafter, a steel pipe excellent in corrosion resistance and a method of manufacturing the same according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram of a steel pipe manufacturing apparatus excellent in corrosion resistance according to one embodiment of the present invention.
As shown in FIG. 1, the steel pipe manufactured by the pipe making process is preferably carried into the apparatus according to the present embodiment while being wound in a coil shape by a coiler apparatus. That is, it is preferable that the above pipe making process is performed in a separate line.
After the steel pipe (1) carried into the steel pipe manufacturing apparatus spreads linearly by the uncoiler apparatus (3), various acid solutions or surfactants are applied to the surface of the steel pipe by the chemical treatment apparatus (5). It is preferable to perform chemical treatment using a combination of the above. At this time, the foreign matter on the surface of the steel pipe is removed. Further, after the chemical treatment, it is preferable that the oxidized foreign matter attached to the surface of the steel pipe can be physically removed by a wire brush or the like rotated at high speed. Next, the surface of the steel pipe is cleaned with water and air.

次いで、上記の鋼管(1)は、予熱装置(7)、前処理装置(10)、メッキ装置(20)、そして樹脂コーティング装置(18)を含んでなる、耐食性に優れた鋼管の製造装置を通過して製造されることが好ましい。
ここで、上記の予熱装置(7)は、造管過程により形成された鋼管(1)を予熱する。このために、上記の予熱装置(7)は誘導加熱方式のヒーターを用いて、上記鋼管の温度を約600℃以上に予熱することが好ましい。このように予熱された鋼管は、フレキシブルな状態に変化され、表面が加熱されて効果的に前処理またはメッキすることができる。
また、上記の前処理装置(10)は、上記の予熱された鋼管(1)の温度を所定の温度以上に維持させ、還元雰囲気を提供する。このために、上記の前処理装置は、少なくとも一つ以上のチューブ(11)、セラミックヒーター(12)、そしてガス注入装置(13)を含んでなることが好ましい。ここで、上記のチューブ(11)は、少なくとも一つ以上の所定の間隔で一列で配置されることが好ましい。 Next, the steel pipe (1) includes a steel pipe manufacturing apparatus having excellent corrosion resistance, including a preheating device (7), a pretreatment device (10), a plating device (20), and a resin coating device (18). It is preferred to be manufactured through.
Here, the preheating device (7) preheats the steel pipe (1) formed by the pipe making process. Therefore, the preheating device (7) preferably uses an induction heating type heater to preheat the temperature of the steel pipe to about 600 ° C. or higher. The steel pipe preheated in this way is changed to a flexible state and the surface is heated so that it can be effectively pretreated or plated.
Further, the pretreatment device (10) maintains the temperature of the preheated steel pipe (1) above a predetermined temperature and provides a reducing atmosphere. For this purpose, the pretreatment device preferably includes at least one tube (11), a ceramic heater (12), and a gas injection device (13). Here, the tubes (11) are preferably arranged in a line at a predetermined interval of at least one or more.

詳しくは、上記のチューブ(11)は表面が保温処理され、内部に沿って上記の鋼管(1)が貫通するように配置される。上記チューブ(11)の外周面には熱を発生させるセラミックヒーター(12)が取り付けられ、予熱された鋼管の温度を所定の温度以上に維持させる。また、上記のガス注入装置(13)は、上記チューブ(11)の内部に窒素及び水素の混合ガスを注入することにより、還元雰囲気を組成する。
この際、上記チューブ(11)の内部に供給される混合ガスには還元ガスである水素が5〜25%濃度で含まれ、大気圧下で上記チューブ(11)の内部体積の約3部に対応する混合ガスが注入されることが好ましい。このような還元雰囲気の組成により、加熱された鋼管の表面が黒く酸化することを防止し、後述するメッキ工程がより安定的に行われるようにする。 Specifically, the surface of the tube (11) is heat-treated, and the steel pipe (1) is disposed along the inside. A ceramic heater (12) for generating heat is attached to the outer peripheral surface of the tube (11), and the temperature of the preheated steel pipe is maintained at a predetermined temperature or higher. The gas injection device (13) forms a reducing atmosphere by injecting a mixed gas of nitrogen and hydrogen into the tube (11).
At this time, the mixed gas supplied to the inside of the tube (11) contains hydrogen as a reducing gas at a concentration of 5 to 25%, and is about 3 parts of the internal volume of the tube (11) under atmospheric pressure. The corresponding mixed gas is preferably injected. With such a reducing atmosphere composition, the surface of the heated steel pipe is prevented from being oxidized black, and the plating process described later is performed more stably.

一方、上記のメッキ装置(20)は鋼管(1)の表面に耐腐食性合金をメッキする装置であって、ヒーター(22)と溶融された合金が貯蔵されるポット(21)を含んでなることが好ましい。
図2は、本発明の一つの実施例による耐食性に優れた鋼管の断面図である。
図2で示されるように、鋼管(100)の表面に55質量%のアルミニウムと43.4〜44.9質量%の亜鉛の合金がメッキされてメッキ層(101)が形成されることにより、著しく向上した耐食性を提供することができる。ここで、上記の合金は55質量%のアルミニウムと43.4〜44.9質量%の亜鉛の合金(‘セアリウム(SeAHLume)合金’という)であって、卓越な性能の耐腐食性を有する。
さらに、上記の合金は0.1〜1.6質量%のシリコンを更に含むことが好ましい。 On the other hand, the plating device (20) is a device for plating a corrosion-resistant alloy on the surface of the steel pipe (1), and includes a heater (22) and a pot (21) in which the molten alloy is stored. It is preferable.
FIG. 2 is a cross-sectional view of a steel pipe excellent in corrosion resistance according to one embodiment of the present invention.
As shown in Fig. 2, the surface of the steel pipe (100) is plated with an alloy of 55 mass% aluminum and 43.4-44.9 mass% zinc to form a plating layer (101), thereby significantly improving corrosion resistance. Can be provided. Here, the above alloy is an alloy of 55 mass% aluminum and 43.4 to 44.9 mass% zinc (referred to as 'SeAHLume alloy'), and has excellent performance corrosion resistance.
Further, the above alloy preferably further contains 0.1 to 1.6% by mass of silicon.

図1に示されるように、上記の合金を溶融させるヒーター(22)は上記ポット(21)の下部に提供されることが好ましく、誘導過熱方式で上記の合金を溶融させる加熱源として提供される。
そして、上記のポット(21)は溶融された合金を貯蔵する容器であって、その一側には、上記の鋼管(1)が通過する経路に配置されるメッキ部(21a)が突出した形態で提供されることが好ましい。即ち、上記の溶融された合金の一部は上記のメッキ部(21a)に流入され、上記のメッキ部(21a)に形成されたホールを通して移動される鋼管(1)の表面に、上記の合金がメッキされる。
ここで、上記の鋼管(1)がメッキ部(21a)を通る経路は垂直に配置されることが好ましい。即ち、上部ガイドローラー(31)と下部ガイドローラー(30)の間で、上記の鋼管(1)は垂直に移動され、これにより重力の影響で上記合金のメッキが非対称的に行われることが防止され、円周方向に均一なメッキ層が形成され得る。
垂直に上昇した後、上記の鋼管(1)は上部ガイドローラー(31)により所定の角度で斜めに下降されて次の工程に移動し、再び水平に移動される区間に達すると、上記の鋼管(1)は空冷式及び水冷式の冷却装置(15)により冷却される。このような冷却過程は、空気の送風による方式及び上記鋼管の表面に水を噴射する方式(クェンチング(quenching)作業)を含んでなることが好ましい。 As shown in FIG. 1, the heater (22) for melting the alloy is preferably provided at the lower part of the pot (21), and is provided as a heating source for melting the alloy by induction heating. .
The pot (21) is a container for storing a molten alloy, and on one side of the pot (21), a plating part (21a) arranged in a path through which the steel pipe (1) passes is projected. Is preferably provided. That is, a part of the molten alloy flows into the plated portion (21a), and the alloy is moved to the surface of the steel pipe (1) moved through the hole formed in the plated portion (21a). Is plated.
Here, the path through which the steel pipe (1) passes through the plated portion (21a) is preferably arranged vertically. That is, the steel pipe (1) is moved vertically between the upper guide roller (31) and the lower guide roller (30), thereby preventing the alloy from being asymmetrically plated due to the influence of gravity. Thus, a uniform plating layer can be formed in the circumferential direction.
After ascending vertically, the steel pipe (1) is lowered at a predetermined angle by the upper guide roller (31) and moved to the next step. (1) is cooled by an air-cooling type and water-cooling type cooling device (15). Such a cooling process preferably includes a method of blowing air and a method of injecting water onto the surface of the steel pipe (quenching operation).

一方、上記鋼管(1)の冷却後には、上記アルミニウム−亜鉛の合金がメッキされた表面に、黒変及び白錆のような変色が発生することを防止し、後述する樹脂層のコーティング時における樹脂層の密着性を高めるために、クロメート処理装置(17)により、上記鋼管の表面3価クロムを5秒以内、好ましくは1秒以内の時間で供給する。
この後、上記の樹脂コーティング装置(18)により、上記のメッキされた鋼管の表面に追加的に合成樹脂がコーティングされる。ここで、上記の合成樹脂は、無色のナノ樹脂からなり、より詳しくはナイロン(Nylon)樹脂を含んでなることが好ましい。 On the other hand, after cooling the steel pipe (1), the surface plated with the aluminum-zinc alloy is prevented from causing discoloration such as black discoloration and white rust. In order to improve the adhesion of the resin layer, the surface trivalent chromium of the steel pipe is supplied within 5 seconds, preferably within 1 second, by the chromate treatment device (17).
Thereafter, the surface of the plated steel pipe is additionally coated with a synthetic resin by the resin coating apparatus (18). Here, the synthetic resin is made of a colorless nanoresin, and more specifically, preferably contains a nylon resin.

図3は、本発明の別の実施例による耐食性に優れた鋼管の断面図である。
図3で示されるように、上記の鋼管(100)にメッキされたメッキ層(101)の表面には、3価クロメート処理された層(101a)が形成される。また、上記のクロメート処理された層(101a)の表面には、ナイロン樹脂がコーティングされたコーティング層(102)が形成される。これにより、耐食性が更に改善できる。
上記のような装置により製造された鋼管は、次の工程に移動するためにコイル状が巻かれる。 FIG. 3 is a cross-sectional view of a steel pipe excellent in corrosion resistance according to another embodiment of the present invention.
As shown in FIG. 3, a trivalent chromate-treated layer (101a) is formed on the surface of the plated layer (101) plated on the steel pipe (100). Further, a coating layer (102) coated with a nylon resin is formed on the surface of the chromate-treated layer (101a). Thereby, corrosion resistance can further be improved.
The steel pipe manufactured by the apparatus as described above is coiled to move to the next step.

一方、図4は、本発明の一つの実施例によるメッキ装置を示した図であり、この図面を参照にし、上記メッキ装置の構成をより詳しく説明すると、次の通りである。
図4で示されるように、上記ポット(21)の下部には誘導加熱方式のヒーター(22)が提供され、上記ポット(21)の一側にはメッキ部(21a)が突出した形状で提供される。
ここで、上記のメッキ部(21a)を通過する鋼管(1)の経路は垂直に成ることが好ましく、上記の垂直に通過する経路の上端及び下端には、それぞれ上記鋼管の移動を案内する上部及び下部ガイドローラー(31，30)が提供されることが好ましい。
図示されたように、上記の鋼管は地面に水平の方向に沿って上記の下部ガイドローラー(30)に流入された後、折り曲げられ地面に実質的に垂直の方向に移動される。この際、上記の下部ガイドローラー(30)の周辺は、ケースにより囲まれた状態で提供され、上記ケースの内部には、上記鋼管の外径差による余裕間隔を調節する補助治具が提供されることが好ましい。 On the other hand, FIG. 4 is a view showing a plating apparatus according to an embodiment of the present invention. The configuration of the plating apparatus will be described in more detail with reference to this drawing as follows.
As shown in FIG. 4, an induction heating type heater (22) is provided at the lower part of the pot (21), and a plating part (21a) is provided in a protruding shape on one side of the pot (21). Is done.
Here, the path of the steel pipe (1) passing through the plated portion (21a) is preferably vertical, and the upper and lower ends of the path passing through the vertical are respectively upper parts for guiding the movement of the steel pipe. And lower guide rollers (31, 30) are preferably provided.
As shown in the drawing, the steel pipe flows into the lower guide roller (30) along a direction horizontal to the ground, and then is bent and moved in a direction substantially perpendicular to the ground. At this time, the periphery of the lower guide roller (30) is provided in a state surrounded by a case, and an auxiliary jig is provided inside the case for adjusting a margin interval due to a difference in outer diameter of the steel pipe. It is preferable.

この後、上記の鋼管(1)はメッキ部を通過し、表面に55質量%アルミニウムと43.4〜44.9質量%の亜鉛を含む合金がメッキされる。ここで、上記の合金は0.1〜1.6質量%のシリコンをさらに含むことが好ましい。また、上記のメッキ部(21a)には、常に溶融された合金が貯蔵されるものでなく、上記ポット(21)の内部に選択的に進入できるレベルブロック(26)によりメッキ部(21a)に流入される、溶融された合金のレベルが調節される。
詳しくは、上記ポット(21)の内部には、上部空間を区画する分離膜(24)が提供され、上記分離膜(24)の一側には、レベルブロック(26)が上下移動可能に取り付けられる。上記の分離膜(24)は、レベルブロック(26)の上下移動に従って、上記のメッキ部(21a)の周辺で溶融された合金のレベルがだぶつくことを防止する。上記のレベルブロック(26)が下部に移動され溶融された合金に浸ると、上記溶融された合金のレベルが上がることにより、上記のメッキ部(21a)に合金が流入される。反面、上記のレベルブロック(26)が上昇すると、上記溶融された合金のレベルが下降されてメッキ部(21a)に合金が残存しないように調節され得る。 Thereafter, the steel pipe (1) passes through the plating portion, and an alloy containing 55 mass% aluminum and 43.4 to 44.9 mass% zinc is plated on the surface. Here, the alloy preferably further includes 0.1 to 1.6 mass% silicon. The plated portion (21a) does not always store the molten alloy, and the level block (26) that can selectively enter the pot (21) allows the plated portion (21a) to enter the plated portion (21a). The level of molten alloy flowing in is adjusted.
Specifically, a separation membrane (24) for partitioning the upper space is provided inside the pot (21), and a level block (26) is attached to one side of the separation membrane (24) so as to be movable up and down. It is done. The separation membrane (24) prevents the level of the alloy melted around the plated portion (21a) from becoming excessive as the level block (26) moves up and down. When the level block (26) is moved to the lower part and immersed in the molten alloy, the level of the molten alloy is increased, so that the alloy flows into the plated portion (21a). On the other hand, when the level block (26) is raised, the level of the molten alloy can be lowered so that the alloy does not remain in the plated portion (21a).

一方、上記メッキ部(21a)の下面には、上記の鋼管(1)が通過するホール(21b)が毛形成され、上記のホール(21b)により上記の溶融された合金が下側に漏洩されることを防止するように、圧力調節装置が提供されることが好ましい。上記の圧力調節装置は、下部ノズル装置(41)及びガイドパイプ(40)を含んでなることが好ましい。
ここで、上記のガイドパイプ(40)は下部ガイドローラー(30)を囲んでいるケースと連結され、上記のガイドパイプ(40)の内部には窒素などのような非活性ガスが供給され、0.1〜0.3barの高圧の状態で維持されることが好ましい。また、上記ガイドパイプ(40)の上端は、上記の下部ノズル装置(41)と連結され、上記下部ノズル装置(41)の圧力も高圧状態で維持されることで、上記のメッキ部(21a)内に供給された溶融された合金が下側に漏洩されることが防止される。
このように、上記のガイドパイプ(40)及び下部ノズル装置(41)からなる圧力調節装置の内部の圧力を調節することにより、上記のメッキ部(21a)を貫通して垂直に移動される鋼管の表面に溶融された合金が均一にメッキされるのはもちろんのこと、上記の合金が下側に漏洩されることが防止できる。 On the other hand, a hole (21b) through which the steel pipe (1) passes is formed on the lower surface of the plated portion (21a), and the molten alloy is leaked downward by the hole (21b). In order to prevent this, a pressure regulating device is preferably provided. The pressure adjusting device preferably includes a lower nozzle device (41) and a guide pipe (40).
Here, the guide pipe (40) is connected to a case surrounding the lower guide roller (30), and an inert gas such as nitrogen is supplied to the inside of the guide pipe (40). It is preferably maintained at a high pressure of ~ 0.3 bar. Further, the upper end of the guide pipe (40) is connected to the lower nozzle device (41), and the pressure of the lower nozzle device (41) is maintained in a high pressure state, so that the plated portion (21a) The molten alloy supplied inside is prevented from leaking downward.
In this way, by adjusting the pressure inside the pressure adjusting device comprising the guide pipe (40) and the lower nozzle device (41), the steel pipe is moved vertically through the plated portion (21a). It is possible to prevent the molten alloy from being leaked downward, as well as the molten alloy is uniformly plated on the surface.

また、上記下部ノズル装置(41)の上下にはそれぞれガイドノズルが提供され、上記のガイドノズルは制作される鋼管の外径が変化される場合、上記鋼管の外径に対応して交替可能に構成される。
このように、上記の鋼管(1)は重力方向と一致する方向に垂直上方に移動するため、上記のメッキ部(21a)を通過し、表面に合金が均一にメッキできる。即ち、重力により鋼管(1)の表面にメッキされた溶融された合金が一側に流れるようになり、非対称的な厚さにメッキされることが防止できる。
さらに、上記メッキ部(21a)の上側には、上記の鋼管に向かって空気またはその他の混合ガスを噴射する上部ノズル装置(34)が提供されることが好ましい。上記の上部ノズル装置(34)は酸化を防止するために、上記の鋼管に水素ガスを微量供給してフレーム(frame)が発生するように構成されることもある。また、上記の上部ノズル装置(34)を通して窒素などの非活性ガスを上記の鋼管(1)に向かって送風することにより、上記の鋼管にメッキされる合金の厚さを調節することもできる。 Also, guide nozzles are provided above and below the lower nozzle device (41), respectively, and when the outer diameter of the steel pipe to be produced is changed, the guide nozzle can be changed according to the outer diameter of the steel pipe. Composed.
As described above, the steel pipe (1) moves vertically upward in a direction coinciding with the direction of gravity, so that it passes through the plating portion (21a) and the surface can be uniformly plated with the alloy. That is, the molten alloy plated on the surface of the steel pipe (1) by gravity flows to one side, and can be prevented from being plated to an asymmetric thickness.
Furthermore, it is preferable that an upper nozzle device (34) for injecting air or other mixed gas toward the steel pipe is provided on the upper side of the plating portion (21a). The upper nozzle device (34) may be configured to generate a frame by supplying a small amount of hydrogen gas to the steel pipe in order to prevent oxidation. Further, the thickness of the alloy plated on the steel pipe can be adjusted by blowing an inert gas such as nitrogen through the upper nozzle device (34) toward the steel pipe (1).

一方、上記のメッキ部(21a)を通過した鋼管(1)は、垂直上方に約20m程度継続的に移動される。この際、上記鋼管(1)の移動経路には、上記の鋼管を囲むチューブ型の冷却装置(32)が少なくとも一つ以上提供されるが、上記チューブ型の冷却装置(32)の内部に送風される空気により、上記鋼管(1)の表面が所定の温度以下に冷却することもある。
また、上記鋼管(1)の移動経路の上端には上部ガイドローラー(31)が提供され、上記の鋼管は上部ガイドローラー(31)により折り曲げられ、約30゜以内の鋭角の状態で斜めに次の工程の冷却装置等に移動される。以後の工程は、図1を参照して前述された通りである。 On the other hand, the steel pipe (1) that has passed through the plating part (21a) is continuously moved upward by about 20 m vertically. At this time, at least one tube-type cooling device (32) surrounding the steel pipe is provided in the movement path of the steel pipe (1), and air is blown into the tube-type cooling device (32). The surface of the steel pipe (1) may be cooled to a predetermined temperature or less by the air that is generated.
Further, an upper guide roller (31) is provided at the upper end of the moving path of the steel pipe (1), and the steel pipe is bent by the upper guide roller (31), and then obliquely follows an acute angle within about 30 °. It is moved to the cooling device etc. of the process. Subsequent steps are as described above with reference to FIG.

一方、本発明の好ましい実施例による耐食性に優れた鋼管の製造方法を説明すると、次の通りである。
図5は、本発明に係る耐食性に優れた鋼管の製造方法を示す図である。
図5で示されるように、まず造管過程により形成された鋼管を予熱する段階が行われる(S10)。これにより、上記鋼管の柔軟性を高めて表面に合金がよくメッキできる状態になる。この際、上記の鋼管は600℃以上に予熱されることが好ましい。
また、上記の予熱された鋼管の温度を所定の温度以上に維持させ、還元雰囲気を提供する段階が行われるが(S20)、上記の還元雰囲気の組成は、水素及び窒素の混合ガスを上記鋼管の周囲に投入することで行われる。
この後、55質量%のアルミニウムと43〜45質量%の亜鉛の合金を溶融させ、上記の溶融された合金を上記鋼管の表面をメッキする段階が進行される(S30)。ここで、上記の合金は0.1〜1.6質量%のシリコンをさらに含むことが好ましい。 Meanwhile, a method for manufacturing a steel pipe having excellent corrosion resistance according to a preferred embodiment of the present invention will be described as follows.
FIG. 5 is a view showing a method of manufacturing a steel pipe excellent in corrosion resistance according to the present invention.
As shown in FIG. 5, first, a step of preheating the steel pipe formed by the pipe making process is performed (S10). Thereby, the flexibility of the steel pipe is increased and the surface can be well plated with the alloy. At this time, the steel pipe is preferably preheated to 600 ° C. or higher.
Further, the step of maintaining the temperature of the preheated steel pipe above a predetermined temperature and providing a reducing atmosphere is performed (S20), the composition of the reducing atmosphere is a mixed gas of hydrogen and nitrogen with the steel pipe. It is done by throwing around.
Thereafter, a step of melting an alloy of 55 mass% aluminum and 43 to 45 mass% zinc and plating the surface of the steel pipe with the molten alloy proceeds (S30). Here, the alloy preferably further includes 0.1 to 1.6 mass% silicon.

上記比率の合金は、強力な耐腐食性を有する、ここで、上記の鋼管は、上記の溶融された合金が貯蔵されたポットを垂直上方に通過してメッキされる。この際、上記の鋼管がメッキ部を垂直に通過する間、上記メッキ部の下部に備えられた圧力調節装置により大気圧以上の圧力が加えられるようにすることで、溶融された合金が下側に漏洩されることが防止できる。
そして、上記のポットを通過した鋼管の表面にメッキされた合金の厚さを調節するために、上記の鋼管に向かってガスが噴射されることが好ましい。これにより、上記鋼管の表面にメッキされる合金の厚さを均一に維持することができる。
また、上記鋼管の垂直移動の経路は、前述したように、上部及び下部ガイドローラーにより案内されることが好ましい。
上記の合金がメッキされる鋼管の表面には、樹脂をコーティングする段階(S50)がさらに行われることが好ましい。この際、無色のナノ(nano)タイプの樹脂が上記鋼管の表面にコーティングされ、より好ましくは上記の樹脂はナイロン樹脂を含んでなることが好ましい。 The above ratio alloy has strong corrosion resistance, where the steel pipe is plated vertically passing through the pot in which the molten alloy is stored. At this time, while the steel pipe passes vertically through the plated portion, the molten alloy is placed on the lower side by applying a pressure higher than atmospheric pressure by a pressure control device provided at the lower portion of the plated portion. It is possible to prevent leakage.
And in order to adjust the thickness of the alloy plated on the surface of the steel pipe that has passed through the pot, it is preferable that gas is injected toward the steel pipe. Thereby, the thickness of the alloy plated on the surface of the steel pipe can be maintained uniformly.
Moreover, it is preferable that the vertical movement path of the steel pipe is guided by the upper and lower guide rollers as described above.
It is preferable that a step of coating a resin (S50) is further performed on the surface of the steel pipe on which the alloy is plated. At this time, a colorless nano type resin is coated on the surface of the steel pipe, and the resin preferably includes a nylon resin.

一方、樹脂をメッキする前には、上記の鋼管が一定の温度以下に冷却されることが好ましい。このために、上記のメッキされた鋼管に空気を送風し、冷却水を用いて蒸気の鋼管をクェンチング(quenching)する冷却段階(S40)がさらに行われることが好ましい。
また、上記の鋼管に樹脂をコーティングするための前処理過程であって、3価クロメート処理工程が予め行われることが好ましい。これにより、上記鋼管の変色を防止し、良い外観を有する鋼管を製造することができる。
このような方法により製造された鋼管は、表面にセアリウム合金がメッキされるだけでなく、ナイロン系列の樹脂がコーティングされ強力な耐食性を有するため、熱交換器などのような装置に適用される場合、安定した運用が保証できる。 On the other hand, before plating the resin, the steel pipe is preferably cooled to a certain temperature or lower. To this end, it is preferable to further perform a cooling step (S40) in which air is blown to the plated steel pipe and the steam steel pipe is quenched with cooling water.
Moreover, it is a pretreatment process for coating the steel pipe with the resin, and a trivalent chromate treatment process is preferably performed in advance. Thereby, discoloration of the said steel pipe can be prevented and the steel pipe which has a good external appearance can be manufactured.
When steel pipes manufactured by such a method are not only plated with cerium alloy on the surface, but also coated with nylon series resin and have strong corrosion resistance, when applied to equipment such as heat exchangers Stable operation can be guaranteed.

前述したように、本発明に係る耐食性に優れた鋼管及びその製造方法は、次のような効果を提供する。
第一、表面に55質量%のアルミニウムと43.4〜44.9質量%の亜鉛を含む合金のメッキ層が形成された鋼管は、著しく改善された耐腐食性を提供することができる。
第二、上記のメッキ作業は鋼管が実質的に垂直に移動されながら行われるため、上記鋼管の表面にアルミニウム−亜鉛合金が上記鋼管の円周方向に沿って均一にメッキできる。
第三、上記の鋼管に合金がメッキされる時、上記の上部ノズル装置を通して非活性ガスが鋼管に向かって噴射されることにより、上記の鋼管にメッキされる合金の厚さを容易に調節できる。
第四、上記のメッキされた鋼管の表面に樹脂をさらにコーティングすることにより、優れた外観を有する鋼管を製造でき、耐腐食性をさらに改善できる。
第五、上記メッキ層の表面が3価クロメート処理されることにより、5価クロメート処理に比べて環境にやさしく、樹脂コーティング層の密着性を向上させることができる。
一方、上記のような本発明の各実施例は、本発明をより理解しやすくするために構成したものであって、単純に前述した実施例にのみ限定されるのではなく、本発明は、前述した実施例の技術的思想から外れない範囲内で多様な変形を含む。 As described above, the steel pipe excellent in corrosion resistance and the manufacturing method thereof according to the present invention provide the following effects.
First, a steel pipe having a surface plated with an alloy containing 55 mass% aluminum and 43.4-44.9 mass% zinc can provide significantly improved corrosion resistance.
Second, since the above-described plating operation is performed while the steel pipe is moved substantially vertically, an aluminum-zinc alloy can be uniformly plated on the surface of the steel pipe along the circumferential direction of the steel pipe.
Third, when an alloy is plated on the steel pipe, the thickness of the alloy plated on the steel pipe can be easily adjusted by injecting an inert gas through the upper nozzle device toward the steel pipe. .
Fourth, by further coating the surface of the plated steel pipe with a resin, a steel pipe having an excellent appearance can be manufactured, and the corrosion resistance can be further improved.
Fifth, when the surface of the plating layer is trivalent chromate treated, it is more environmentally friendly than the pentavalent chromate treatment, and the adhesion of the resin coating layer can be improved.
On the other hand, each embodiment of the present invention as described above is configured to make the present invention easier to understand, and is not limited to the embodiment described above. Various modifications are included without departing from the technical idea of the above-described embodiments.

本発明の一つの実施例による耐食性に優れた鋼管の製造装置を示した概略的な構成図。The schematic block diagram which showed the manufacturing apparatus of the steel pipe excellent in corrosion resistance by one Example of this invention. 本発明の一つの実施例による耐食性に優れた鋼管の製造方法を示した流れ図。The flowchart which showed the manufacturing method of the steel pipe excellent in corrosion resistance by one Example of this invention. 本発明の別の実施例による耐食性に優れた鋼管の製造方法により製造された鋼管の断面図。Sectional drawing of the steel pipe manufactured by the manufacturing method of the steel pipe excellent in corrosion resistance by another Example of this invention. 本発明の一つの実施例によるメッキ装置の構成を示した断面図。The sectional view showing the composition of the plating device by one example of the present invention. 本発明に係る耐食性に優れた鋼管の製造方法により製造された鋼管の断面図。Sectional drawing of the steel pipe manufactured by the manufacturing method of the steel pipe excellent in corrosion resistance based on this invention.

符号の説明Explanation of symbols

１ 鋼管
３ アンコイラー装置
５ 化学的処理装置
７ 予熱装置
１０ 前処理装置
１１ チューブ
１２ セラミックヒーター
１３ ガス注入装置
１５ 冷却装置
１７ クロメート処理装置
１８ 樹脂コーティング装置
２０ メッキ装置
２１ ポット
２１ａ メッキ部
２１ｂ ホール
２２ ヒーター
２４ 分離膜
２６ レベルブロック
３０ 下部ガイドローラー
３１ 上部ガイドローラー
３２ 冷却装置
３４ 上部ノズル装置
４０ ガイドパイプ
４１ 下部ノズル装置
１００ 鋼管
１０１ メッキ層
１０１ａ クロメート処理された層
１０２ コーティング層 DESCRIPTION OF SYMBOLS 1 Steel pipe 3 Uncoiler apparatus 5 Chemical processing apparatus 7 Preheating apparatus 10 Preprocessing apparatus 11 Tube 12 Ceramic heater 13 Gas injection apparatus 15 Cooling apparatus 17 Chromate processing apparatus 18 Resin coating apparatus 20 Plating apparatus 21 Pot 21a Plating part 21b Hole 22 Heater 24 Separation membrane 26 Level block 30 Lower guide roller 31 Upper guide roller 32 Cooling device 34 Upper nozzle device 40 Guide pipe 41 Lower nozzle device 100 Steel pipe 101 Plating layer 101a Chromate treated layer 102 Coating layer

Claims (13)

造管過程により形成された鋼管を予熱する第1段階；
前記の予熱された鋼管の温度を所定の温度以上に維持させ、還元雰囲気を提供する第2段階；
55質量%のアルミニウムと43.4〜44.9質量%の亜鉛を含む合金を溶融させ、レベルブロックを前記の溶融された合金内に挿入して、分離膜により前記の溶融された合金がメッキ部の周辺でだぶつくのを防止しながら、前記の溶融された合金のレベルを上げて溶融された前記合金をメッキ部に流入させることで、前記の溶融された合金を前記鋼管の表面にメッキする第3段階；
前記の鋼管を冷却させる第4段階；及び
前記鋼管の表面に樹脂をコーティングする第5段階を含んで行われる、耐食性に優れた鋼管の製造方法。 The first stage of preheating the steel pipe formed by the pipe making process;
A second stage of maintaining the temperature of the preheated steel pipe above a predetermined temperature and providing a reducing atmosphere;
An alloy containing 55 mass% aluminum and 43.4-44.9 mass% zinc is melted, and a level block is inserted into the molten alloy, and the molten alloy is separated around the plated portion by a separation membrane. The third step of plating the molten alloy on the surface of the steel pipe by increasing the level of the molten alloy and causing the molten alloy to flow into the plating portion while preventing looseness ;
A method for producing a steel pipe having excellent corrosion resistance, comprising: a fourth stage for cooling the steel pipe; and a fifth stage for coating a resin on the surface of the steel pipe. 前記の合金が、0.1〜1.6質量%のシリコンをさらに含んでなることを特徴とする、請求項1に記載の耐食性に優れた鋼管の製造方法。 2. The method for producing a steel pipe excellent in corrosion resistance according to claim 1, wherein the alloy further contains 0.1 to 1.6% by mass of silicon. 前記の第3段階において、前記の鋼管が前記の溶融された合金が貯蔵されたメッキ部を垂直上方に通過してメッキされ、前記鋼管の表面にメッキされた合金の厚さを調節するために、前記の鋼管に向かってガスが噴射されることを特徴とする、請求項1に記載の耐食性に優れた鋼管の製造方法。 In the third step, in order to adjust the thickness of the alloy plated on the surface of the steel pipe, the steel pipe is plated vertically through the plated portion where the molten alloy is stored. 2. The method for producing a steel pipe with excellent corrosion resistance according to claim 1, wherein gas is injected toward the steel pipe. 前記メッキ部の下部には、前記の通過する鋼管とメッキ部の間に溶融された合金が下側に流出しないように、圧力調節装置により大気圧より高い圧力が加えられることを特徴とする、請求項1に記載の耐食性に優れた鋼管の製造方法。 A pressure higher than the atmospheric pressure is applied to the lower part of the plating part by a pressure adjusting device so that the alloy melted between the steel pipe passing through and the plating part does not flow downward. The method for producing a steel pipe having excellent corrosion resistance according to claim 1. 前記第2段階において、還元雰囲気の組成が水素及び窒素の混合ガスを前記鋼管の周囲に投入することで行われることを特徴とする、請求項1に記載の耐食性に優れた鋼管の製造方法。 2. The method for producing a steel pipe with excellent corrosion resistance according to claim 1, wherein in the second stage, the composition of the reducing atmosphere is performed by introducing a mixed gas of hydrogen and nitrogen around the steel pipe. 前記第4段階が、
前記のメッキされた鋼管に空気を送風する段階；及び
冷却水を用いて前記の鋼管をクェンチング(quenching)する段階を含んで行われることを特徴とする、請求項1に記載の耐食性に優れた鋼管の製造方法。 The fourth stage is
The anti-corrosion property according to claim 1, comprising: blowing air to the plated steel pipe; and quenching the steel pipe with cooling water. Steel pipe manufacturing method. 前記第5段階の前処理過程であって、3価クロメート処理工程が行われることを特徴とする、請求項1に記載の耐食性に優れた鋼管の製造方法。 2. The method for producing a steel pipe with excellent corrosion resistance according to claim 1, wherein a trivalent chromate treatment step is performed in the fifth pretreatment step. 前記第5段階において、無色のナイロン樹脂が前記鋼管の表面にコーティングされることを特徴とする、請求項1に記載の耐食性に優れた鋼管の製造方法。 2. The method for producing a steel pipe with excellent corrosion resistance according to claim 1, wherein a colorless nylon resin is coated on a surface of the steel pipe in the fifth step. 造管過程により形成された鋼管を予熱する予熱装置；
前記の予熱された鋼管の温度を所定の温度以上に維持させ、還元雰囲気を提供する前処理装置(pre-treating apparatus)；
アルミニウムと亜鉛を含む合金を溶融させる加熱源として提供されるヒーターと、前記の鋼管が通過する経路に、前記の溶融された合金が前記鋼管の表面にメッキされるように配置されたメッキ部が提供され、内部に前記の溶融された合金が貯蔵されるポットと、前記ポットの内部に備えられ、前記ポットの上部空間を区画し、前記の溶融された合金中に選択的に挿入され前記の溶融された合金のレベルを調節するレベルブロックが上下移動したときに上記の溶融された合金が前記のメッキ部の周辺でだぶつくことを防止する分離膜と、を含むメッキ装置；及び
前記のメッキされた鋼管の外面に合成樹脂を塗布する樹脂塗布装置を含んでなる、耐食性に優れた鋼管の製造装置。 A preheating device for preheating the steel pipe formed by the pipe making process;
A pre-treating apparatus for maintaining the temperature of the preheated steel pipe above a predetermined temperature and providing a reducing atmosphere;
A heater provided as a heating source for melting an alloy containing aluminum and zinc, and a plating portion arranged so that the molten alloy is plated on the surface of the steel pipe in a path through which the steel pipe passes. A pot in which the molten alloy is stored, and is provided inside the pot, defines an upper space of the pot, and is selectively inserted into the molten alloy. A plating apparatus comprising: a separation film for preventing the molten alloy from bumping around the plated portion when a level block for adjusting the level of the molten alloy moves up and down ; and the plating An apparatus for manufacturing a steel pipe having excellent corrosion resistance, comprising a resin coating apparatus for applying a synthetic resin to the outer surface of the steel pipe. 前記の鋼管が通過する経路が実質的に垂直に配置され、前記垂直方向の上段及び下段には、それぞれ前記鋼管の移動を案内する上部及び下部ガイドローラーが提供されることを特徴とする、請求項９に記載の耐食性に優れた鋼管の製造装置。 The path through which the steel pipe passes is arranged substantially vertically, and upper and lower guide rollers for guiding the movement of the steel pipe are provided in the upper and lower stages in the vertical direction, respectively. Item 10. A steel pipe manufacturing apparatus excellent in corrosion resistance according to Item 9 . 前記メッキ部の下部には、前記の通過される鋼管とメッキ部の間に溶融された合金が下側に流出しないように、大気圧より高い圧力を加える圧力調節装置が提供されることを特徴とする、請求項１０に記載の耐食性に優れた鋼管の製造装置。 A pressure adjusting device for applying a pressure higher than atmospheric pressure is provided at a lower portion of the plating portion so that the alloy melted between the steel pipe to be passed through and the plating portion does not flow downward. The manufacturing apparatus of the steel pipe excellent in corrosion resistance of Claim 10 . 前記メッキ部の上側に配置され、前記の鋼管にメッキされる合金の厚さを調節するように、ガスを噴射する上部ノズル装置をさらに含んでなることを特徴とする、請求項９に記載の耐食性に優れた鋼管の製造装置。 The apparatus according to claim 9 , further comprising an upper nozzle device that injects gas so as to adjust a thickness of an alloy that is disposed on the plating unit and is plated on the steel pipe. Steel pipe manufacturing equipment with excellent corrosion resistance. 前記の前処理装置が、
表面が保温処理され、内部に沿って前記の鋼管が貫通するように配置された少なくとも一つ以上のチューブ；
前記のチューブに取り付けられ、熱を発生させるセラミックヒーター；及び
前記チューブの内部に窒素及び水素の混合ガスを注入させるガス注入装置を含んでなることを特徴とする、請求項９に記載の耐食性に優れた鋼管の製造装置。 The pre-processing device is
At least one tube whose surface is heat-treated and arranged so that the steel pipe penetrates along the inside;
The corrosion resistance according to claim 9 , comprising a ceramic heater attached to the tube and generating heat; and a gas injection device for injecting a mixed gas of nitrogen and hydrogen into the tube. Excellent steel pipe manufacturing equipment.
JP2006186782A 2005-09-02 2006-07-06 Steel pipe with excellent corrosion resistance and method for producing the same Expired - Fee Related JP4423273B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020050081692A KR100667174B1 (en) 2005-09-02 2005-09-02 Apparatus for manufacturing steel tube and method for manufacturing the same

Publications (2)

Publication Number Publication Date
JP2007070725A JP2007070725A (en) 2007-03-22
JP4423273B2 true JP4423273B2 (en) 2010-03-03

Family

ID=37387310

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006186782A Expired - Fee Related JP4423273B2 (en) 2005-09-02 2006-07-06 Steel pipe with excellent corrosion resistance and method for producing the same

Country Status (4)

Country Link
EP (1) EP1760166B1 (en)
JP (1) JP4423273B2 (en)
KR (1) KR100667174B1 (en)
CN (1) CN1924075B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100988490B1 (en) * 2008-06-26 2010-10-20 포스코강판 주식회사 A Method for Manufacturing a Hot Dip Aluminum-Zinc Coated Stainless Steel
KR101188855B1 (en) 2010-02-26 2012-10-09 한국과학기술원 Method and apparatus for fabricating reinforced metal pipe
KR101094185B1 (en) 2011-01-28 2011-12-14 (주)금강 Producing method and apparatus for coated pipe
JP5824868B2 (en) * 2011-05-24 2015-12-02 新日鐵住金株式会社 Method for producing zinc-based plated steel material or zinc-based plated steel molded product
CN104302802B (en) * 2012-04-17 2017-04-12 安赛乐米塔尔研发有限公司 Steel sheet provided with coating offering sacrificial cathodic protection, method for production of part using such sheet, and resulting part
KR101166886B1 (en) 2012-04-23 2012-07-18 (주)금강 Metal-resin complex pipe easily windable in ring shape and, manufacturing methods for the same
CN103361587B (en) * 2013-07-04 2015-12-09 富通集团有限公司 A kind of copper bar production method
KR101545603B1 (en) 2014-11-24 2015-08-20 김장현 Draw bending apparatus
CN105015743A (en) * 2015-07-13 2015-11-04 苏州金业船用机械厂 High-strength and corrosion-resistant propeller shell
KR101711858B1 (en) * 2015-12-24 2017-03-03 주식회사 포스코 Continuous galvanizing apparatus and method
CN113005394B (en) * 2021-02-22 2021-12-07 山东农业大学 J55 steel pipe processing method based on rare earth catalytic carbonitriding

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3559280A (en) * 1968-03-13 1971-02-02 Allied Tube & Conduit Corp Method and apparatus for the continuous forming, galvanizing and coloring of tubing
US3738312A (en) * 1971-12-28 1973-06-12 Bethlehem Steel Corp Molten metal bath level maintenance system
JPS6058787B2 (en) 1981-03-10 1985-12-21 興国鋼線索株式会社 High-speed dip coating method and device for linear bodies
JPS59193278A (en) * 1983-04-14 1984-11-01 Nisshin Steel Co Ltd Steel sheet hot-dip coated with composite zinc-aluminum layer as undercoat for coating
US4621399A (en) * 1985-12-18 1986-11-11 Allied Tube & Conduit Corporation Tube-coating method and apparatus therefor
TW199911B (en) * 1991-12-04 1993-02-11 Armco Steel Co Lp
US5494706A (en) * 1993-06-29 1996-02-27 Nkk Corporation Method for producing zinc coated steel sheet
CA2131059C (en) 1993-09-08 2001-10-30 William A. Carter Hot dip coating method and apparatus
EP0828864A1 (en) * 1995-05-29 1998-03-18 M3D Société Anonyme Method and apparatus for coating a metal strip with a metal or alloy with a lower melting or liquidus point than the strip material
CA2225537C (en) * 1996-12-27 2001-05-15 Mitsubishi Heavy Industries, Ltd. Hot dip coating apparatus and method
US6428851B1 (en) * 2000-03-01 2002-08-06 Bethlehem Steel Corporation Method for continuous thermal deposition of a coating on a substrate
ES2300670T3 (en) 2000-08-18 2008-06-16 Ti Group Automotive Systems Limited METAL METHOD OF A METALLIC STRIP FOR USE IN THE MANUFACTURE OF A MULTIPLE WALL TUBE.
US6893687B2 (en) * 2000-09-25 2005-05-17 Chemetall Gmbh Method for coating metallic surfaces
JP2003166078A (en) * 2001-11-30 2003-06-13 Maruyasu Industries Co Ltd Metal tube having corrosion resistant coating layer
US6598287B1 (en) * 2002-01-24 2003-07-29 Western Tube & Conduit Corporation Apparatus and method for sizing a galvanized tube

Also Published As

Publication number Publication date
EP1760166A3 (en) 2008-04-16
EP1760166A2 (en) 2007-03-07
CN1924075B (en) 2010-06-02
CN1924075A (en) 2007-03-07
EP1760166B1 (en) 2016-09-14
KR100667174B1 (en) 2007-01-12
JP2007070725A (en) 2007-03-22

Similar Documents

Publication Publication Date Title
JP4423273B2 (en) Steel pipe with excellent corrosion resistance and method for producing the same
US7790241B2 (en) Steel tube having improved corrosion-resistance and method for manufacturing the same
JP5776961B2 (en) Method of manufacturing a coated and hardened component of steel and a coated and hardened steel strip for this method
BRPI0621610A2 (en) method for casting dipping a flat steel product made of higher strength steel
JP2010538163A (en) Method and apparatus for controlling and oxidizing the surface of a continuously running steel strip with a radiant tube furnace for galvanizing
KR100676126B1 (en) Anti-corrosion plated steel tube
JP2011089151A (en) Method and apparatus for manufacturing hardened steel
JP2012132098A (en) Galvanized heat-treated steel material, and method for manufacturing the same
JP5086545B2 (en) Steel strip cooling device in cooling zone of continuous heat treatment equipment
JP2007270181A (en) METHOD FOR ADJUSTING BAKE HARDENABILITY OF EXTRA-LOW CARBON STEEL CONTAINING Nb
KR20180123048A (en) Manufacturing method of molten aluminum plated steel wire
KR100928805B1 (en) Manufacturing method of alloyed hot-dip galvanized steel sheet with beautiful surface
KR20180126495A (en) Manufacturing method of molten aluminum plated steel wire
JP2007031806A (en) Method for manufacturing galvannealed steel sheet
KR200201919Y1 (en) Plating apparatus of molten zinc for small caliber steel pipe
KR20180118765A (en) Manufacturing method of molten aluminum plated steel wire
KR20140081436A (en) Anti-corrosion plated steel tube and method for production thereof
CN113811627A (en) Treatment line for the continuous treatment of metal strips with the dual purpose of producing annealed and dip-coated or uncoated strips, and corresponding cooling tower and method of switching from one configuration to another
JP2018172773A (en) Method for producing hot-dip aluminum-coated steel wire
JP2018172769A (en) Method for producing hot-dip aluminum-coated steel wire
JP2009297736A (en) Hot-bending method of metal tube
JP2006212474A (en) Production method for polyethylene resin coating metal pipe and polyethylene resin coating metal pipe
JP2018172767A (en) Method for producing hot-dip aluminum-coated steel wire
JPH05293514A (en) Method for applying surface treatment for corrosion resistance on perforated roll having corrosion resistance and hole surface of perforated roll
JPS63286562A (en) Hot dipping method

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20090202

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090209

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090511

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20091116

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20091207

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121211

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131211

Year of fee payment: 4

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees