JP2005232588A - Method for manufacturing thermally sprayed metal plated steel tube - Google Patents
Method for manufacturing thermally sprayed metal plated steel tube Download PDFInfo
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- JP2005232588A JP2005232588A JP2004319030A JP2004319030A JP2005232588A JP 2005232588 A JP2005232588 A JP 2005232588A JP 2004319030 A JP2004319030 A JP 2004319030A JP 2004319030 A JP2004319030 A JP 2004319030A JP 2005232588 A JP2005232588 A JP 2005232588A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 209
- 239000002184 metal Substances 0.000 title claims abstract description 209
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 title abstract description 72
- 239000010959 steel Substances 0.000 title abstract description 72
- 239000000203 mixture Substances 0.000 claims abstract description 32
- 238000009826 distribution Methods 0.000 claims abstract description 21
- 238000003466 welding Methods 0.000 claims abstract description 16
- 238000007747 plating Methods 0.000 claims description 45
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 43
- 229910052782 aluminium Inorganic materials 0.000 claims description 41
- 238000007751 thermal spraying Methods 0.000 claims description 38
- 238000005507 spraying Methods 0.000 claims description 35
- 239000011701 zinc Substances 0.000 claims description 29
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 28
- 229910052725 zinc Inorganic materials 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 26
- 238000009751 slip forming Methods 0.000 claims description 6
- 239000002932 luster Substances 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
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- 239000007921 spray Substances 0.000 description 18
- 230000007797 corrosion Effects 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 12
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- 150000002739 metals Chemical class 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 239000010953 base metal Substances 0.000 description 7
- 238000005422 blasting Methods 0.000 description 7
- 239000011324 bead Substances 0.000 description 5
- 238000007598 dipping method Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910001335 Galvanized steel Inorganic materials 0.000 description 4
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- 239000008397 galvanized steel Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
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- 238000004513 sizing Methods 0.000 description 4
- 239000002335 surface treatment layer Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
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- 238000004381 surface treatment Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 1
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- 230000007246 mechanism Effects 0.000 description 1
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- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Coating By Spraying Or Casting (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
本発明は、鋼管の内面又は、外面に溶射工程を有する金属めっき鋼管の製造方法に関するものである。 The present invention relates to a method for manufacturing a metal-plated steel pipe having a thermal spraying process on the inner surface or outer surface of the steel pipe.
金属めっき鋼管の製造方法としては、鋼板の表裏両面に異種金属(典型的には亜鉛)をめっきした両面めっき鋼板をロールフォーミングを用いて、連続的に管状成形する工程と、管状に成形されためっき鋼板端面を付け合わせて連続的に溶接して管を形成する工程と、この際に鋼管の外面に形成された溶接ビード部を連続的に切削する工程と、この切削に伴いめっき層の一部が切削されて不めっきになった部位に対して、溶射工程を適用し、不めっき部位をに対して、前記めっきにかかる金属と同一または異種金属を被服することが古くから知られている(特許文献1)。 As a method for producing a metal-plated steel pipe, a double-sided plated steel sheet in which different types of metals (typically zinc) are plated on both the front and back surfaces of the steel sheet is continuously formed into a tubular shape using roll forming, and the tubular structure is formed into a tubular shape. A process of forming a pipe by continuously welding the plated steel plate end surfaces, a process of continuously cutting the weld bead formed on the outer surface of the steel pipe at this time, and a part of the plating layer accompanying this cutting It has been known for a long time that a thermal spraying process is applied to a portion which has been cut and unplated, and the unplated portion is coated with the same or different metal as the metal applied to the plating ( Patent Document 1).
このような工程においては、最終の不めっき部位に対する溶射工程を適用する代わりに、連続的に溶融めっきすることにより代替することも考えられている(出願人による特願2002−225668号(未公開))。
このような技術において、溶射は専ら補修用途に用いられる。つまり、不めっき部分等を外部雰囲気から遮断するために、不めっき部分を対象に、部分的に金属管上に金属を溶射をするという発想は存在する。めっき層全体を改質するために溶射を用い、特定部位のみならず管全体に金属層を形成するという発想は存在しない。 In such technology, thermal spraying is used exclusively for repair applications. That is, there is an idea that the metal is partially sprayed on the metal tube for the non-plated portion in order to shield the non-plated portion from the external atmosphere. There is no idea of using thermal spraying to modify the entire plating layer and forming a metal layer not only on a specific site but also on the entire tube.
他方、補修ではなく、めっき層全体を改質する目的では、上記の製造工程によって製造した鋼管について、再度、同種または異種金属による溶融めっきを施す工程が知られている。例えば、亜鉛めっきにアルミを配合することにより、亜鉛単体では得ることが出来ない耐食性を実現することが可能であることは知られている。製品が使用される環境は年々厳しくなっており、高い耐食性・耐用年数の長期化が望まれていることから新しい合金めっきが必要とされている。このような要求特性としては、耐食性以外のみならず、耐磨耗性、耐熱、電気絶縁、電磁波シールド、電導性なども考えられるが、いずれも他の金属、非金属材料を複合的に被覆することにより、実現可能である。 On the other hand, for the purpose of modifying the entire plating layer rather than repairing, there is known a process in which the steel pipe manufactured by the above manufacturing process is again subjected to hot dip plating with the same or different metal. For example, it is known that by adding aluminum to zinc plating, it is possible to realize corrosion resistance that cannot be obtained with zinc alone. The environment in which products are used is becoming severer year by year, and new alloy plating is required because of high corrosion resistance and long service life. Such required properties include not only corrosion resistance but also wear resistance, heat resistance, electrical insulation, electromagnetic shielding, and electrical conductivity, but all of them are coated with other metals and non-metallic materials in a composite manner. This is feasible.
従来、複数の異種金属を被覆する工程として、亜鉛両面めっき鋼板をロールフォーミング等で成形し、連続溶接、ビード部除去等を行った後に、亜鉛またはこれと異なる金属(例えばアルミニウム)を溶融めっきすることが行われている。しかし、溶融めっき槽を既存のライン中に新設することは工程設計や配列の点で難点があり、設備投資額も少なくはない。 Conventionally, as a process of coating a plurality of different metals, a zinc double-sided plated steel sheet is formed by roll forming, etc., and after continuous welding, bead portion removal, etc., zinc or a metal different from this (for example, aluminum) is hot-plated. Things have been done. However, newly installing a hot dipping bath in an existing line is difficult in terms of process design and arrangement, and the amount of capital investment is not small.
連続溶射による製造方法で得られた金属めっき鋼管の場合、以下のような問題がある。すなわち、溶射金属層の鋼管界面での結合力が、溶融めっき層に比べて弱いため、曲げ加工等を施した場合、溶射金属層の剥がれや割れが発生し、鋼管の耐食性問題が生ずる恐れがある。また、溶射金属層の微妙な厚みのコントロールが難しく、均一な溶射金属層を成形することは困難である。 In the case of a metal-plated steel pipe obtained by a manufacturing method by continuous spraying, there are the following problems. In other words, since the bonding strength of the sprayed metal layer at the steel pipe interface is weaker than that of the hot-dip plated layer, when the bending process is performed, the sprayed metal layer may peel off or crack, which may cause corrosion resistance problems of the steel pipe. is there. Further, it is difficult to control the fine thickness of the sprayed metal layer, and it is difficult to form a uniform sprayed metal layer.
本発明は上記問題点に鑑みて提案されたものであって、全面にわたってほぼ均一で良好な金属層を備えた溶射金属めっき鋼管を生産性よく製造する方法を提供することを目的とする。本発明は、溶射工程によって、めっき層の金属層と十分な結合力を有する金属層を形成することを目的とする。 The present invention has been proposed in view of the above problems, and an object of the present invention is to provide a method for producing a spray-coated metal-plated steel pipe having a substantially uniform and good metal layer over the entire surface with high productivity. An object of this invention is to form the metal layer which has sufficient bond strength with the metal layer of a plating layer by a thermal spraying process.
以上の目的を達成するために、本発明の溶射金属めっきの製造方法は、鋼板を連続的に溶射する工程と、鋼管を連続的に成形する工程と、管状に成形された鋼板の長手方向端面接合部を連続的に溶接して鋼管とする工程と、当該鋼管の外面に、連続的に溶融めっきする工程と、鋼管の外面に連続的に溶射する工程とを備えている。 In order to achieve the above object, the thermal spray metal plating manufacturing method of the present invention includes a step of continuously spraying a steel plate, a step of continuously forming a steel pipe, and a longitudinal end face of the steel plate formed into a tubular shape. The method includes a step of continuously welding the joint portion to form a steel pipe, a step of continuously hot-plating the outer surface of the steel pipe, and a step of thermally spraying the outer surface of the steel pipe.
本願発明をより機能的に表現すると、以下のとおりとなる。すなわち、本願発明は、第一の組成成分からなる金属板を連続的に管状成形し、付け合わせ端部を連続溶接することによって金属管を形成する金属管の製造方法において、連続溶接前に前記金属板の少なくとも一面に、周方向及び長手方向に不連続がない第一の組成成分とは異なる第二の組成成分からなる金属層を溶射により形成する、金属管の製造方法にかかるものである。 The present invention can be expressed more functionally as follows. That is, the present invention relates to a method of manufacturing a metal tube in which a metal plate comprising a first composition component is continuously formed into a tubular shape, and a welded end is continuously welded to form a metal tube. The present invention relates to a method for manufacturing a metal tube, wherein a metal layer made of a second composition component different from the first composition component having no discontinuity in the circumferential direction and the longitudinal direction is formed on at least one surface of the plate by thermal spraying.
また、本願発明は、同様な金属管の製造方法において、連続溶接後に金属管の表面に直接に、円周方向及び長手方向に不連続がない前記第一の組成成分とは異なる第二の組成成分からなる金属層を溶射により形成する、金属管の製造方法にかかるものである。 Further, the present invention provides a similar method for producing a metal tube, wherein the second composition is different from the first composition component in which there is no discontinuity in the circumferential direction and the longitudinal direction directly on the surface of the metal tube after continuous welding. The present invention relates to a method for manufacturing a metal tube, in which a metal layer composed of components is formed by thermal spraying.
また、本願発明は、同様な金属管の製造方法において、連続溶接後に前記金属管の表面に、第一の組成成分とは異なる組成成分よりなる金属層を介して、円周方向及び長手方向に不連続がない金属層を溶射により形成する、金属管の製造方法にかかるものである。 Further, the present invention provides a similar method for manufacturing a metal tube, in a circumferential direction and a longitudinal direction on the surface of the metal tube after continuous welding via a metal layer made of a composition component different from the first composition component. The present invention relates to a method for manufacturing a metal tube, in which a metal layer having no discontinuity is formed by thermal spraying.
本願発明において、溶射による金属層の形成は、連続溶接前に好ましくはその内面に行い、連続溶接後に管表面に行うが、これらを併用しても構わない。 In the present invention, the metal layer is formed by thermal spraying preferably on the inner surface before continuous welding and on the tube surface after continuous welding, but these may be used in combination.
本願発明にかかる製造方法によれば、第一の組成成分からなる第一の金属管部分であって、この第一の金属管部分の断面の少なくとも一部には長手方向に連続した溶融接合部分を有する第一の金属管部分と、第一の金属管部分のいずれかの表面に、直接に、または、第一の組成成分とは異なる組成成分よりなる金属層を介して形成された第二の金属層であって、第二の金属層が断面方向に連続して溶射工程によって形成されている第二の金属層とを具備する金属管を製造することができる。
さらに、本願発明は、めっき層の表面が完全に冷却していない状態、好ましくは、半溶融状態で溶射を行うことによって、めっき層を構成する金属層との十分な結合力を持たせることを特徴としてもよい。半溶融状態とは、融点から融点の8割程度の温度の凝固途上にある状態をいい、例えば、めっき層が亜鉛の場合は、融点から400℃まで温度領域である。
本願発明により得られた金属管にかかるめっき層は、第一の成分を有する金属中に第二の成分を有する金属が島状に点在すること、第一の成分を有する金属中に第二の成分を有する金属が層状に分布することを特徴とする。
According to the manufacturing method of the present invention, a first metal tube portion comprising the first composition component, wherein at least a part of a cross section of the first metal tube portion is a melt-bonded portion continuous in the longitudinal direction. A first metal tube portion having a first metal tube portion and a second metal layer formed on a surface of either of the first metal tube portions directly or via a metal layer made of a composition component different from the first composition component It is possible to manufacture a metal tube including the second metal layer, the second metal layer being continuously formed in the cross-sectional direction by a thermal spraying process.
Furthermore, the present invention provides a sufficient bonding force with the metal layer constituting the plating layer by performing thermal spraying in a state where the surface of the plating layer is not completely cooled, preferably in a semi-molten state. It may be a feature. The semi-molten state refers to a state in the course of solidification at a temperature from the melting point to about 80% of the melting point. For example, when the plating layer is zinc, the temperature range is from the melting point to 400 ° C.
The plating layer applied to the metal tube obtained by the present invention is such that the metal having the second component is scattered in an island shape in the metal having the first component, and the second in the metal having the first component. The metal having the above components is distributed in layers.
なお、溶射・溶融金属めっきに使用する金属は、亜鉛であることが好ましいが、例えば、亜鉛にアルミやその他の金属を含む合金、錫等、他の金属であってもよい。 The metal used for thermal spraying and molten metal plating is preferably zinc, but may be other metals such as an alloy containing aluminum and other metals in zinc, tin, or the like.
本明細書において、溶射とは周知の金属加工学に基づく一般的な定義による。そのような定義の一つとして、例えば、溶射とは燃焼又は電気エネルギーを用いて溶射材料を加熱し、溶融又はそれに近い状態にした粒子を素地に吹き付けて皮膜を形成するプロセスをいう(JISハンドブック金属表面処理H8200参照)。 In this specification, spraying is based on a general definition based on well-known metalworking. As one such definition, for example, thermal spraying refers to a process in which a thermal spray material is heated using combustion or electrical energy, and particles that have been melted or brought close to it are sprayed onto the substrate to form a coating (JIS Handbook). (See Metal Surface Treatment H8200).
本願発明によれば、従来の溶融めっき等のめっき工程ではなく、溶射によって金属層を金属管の内面または外面に形成するので、多額の費用を要するめっき層の設置・管理が不要となり、安価な設備投資により多様な金属層を形成することができ、金属管の設計自由度を増すことが可能となる。 According to the present invention, since the metal layer is formed on the inner surface or the outer surface of the metal tube by thermal spraying instead of the conventional plating process such as hot dipping, it is not necessary to install and manage the plating layer which requires a large amount of money and is inexpensive. Various metal layers can be formed by capital investment, and the degree of freedom in designing the metal tube can be increased.
本願発明によれば、従来の溶射による金属管の局部的な修復ではなく、金属管の表面全部等、断面方向または周方向に連続した金属層を溶射によって形成する。局部的な修復ではない溶射の用い方は当業者には一般的ではない。 According to the present invention, the metal layer continuous in the cross-sectional direction or the circumferential direction, such as the entire surface of the metal tube, is formed by thermal spraying instead of the local repair of the metal tube by conventional thermal spraying. The use of thermal spraying, which is not local repair, is not common to those skilled in the art.
本願発明によれば、溶射装置を用い、アルミニウム層及び亜鉛めっき内にアルミニウムを含有する合金金属を形成することにより、耐食性に優れた防錆効果の高い溶射金属めっき鋼管を得ることができる。
本願発明によれば、複数の金属または組成を有する合金でめっき層を構成する場合に、素地金属と溶射金属との位置関係(分布関係)を制御することができる。
According to the present invention, by using a thermal spraying apparatus and forming an alloy metal containing aluminum in the aluminum layer and galvanizing, it is possible to obtain a thermally sprayed metal plated steel pipe having excellent corrosion resistance and a high rust prevention effect.
According to the present invention, when the plating layer is composed of a plurality of metals or alloys having a composition, the positional relationship (distribution relationship) between the base metal and the sprayed metal can be controlled.
なお、本明細書に記載した発明の効果その他本願発明の特徴は、本願発明の権利範囲を狭めるものであると解釈されてはならない。これらの効果・特徴を一部具備するが、すべて具備しないものも、我が国法令・実務で確立した権利解釈に基づいて本願発明の権利範囲に含まれることは言うまでもない。 The effects of the invention described in this specification and other features of the invention of the present application should not be construed as narrowing the scope of rights of the invention of the present application. Needless to say, those having some of these effects and features, but not all, are also included in the scope of rights of the present invention based on the interpretation of rights established by Japanese laws and practices.
以下に、本発明の実施の形態について詳細に説明する。
本実施形態の溶射金属鋼管の製造方法は、図1に示す製造ラインによって構成されている。この製造ラインは、コイル1に巻き取られた長尺の鋼板を連続的に供給するアンコイラー2と、アンコイラー2から供給された鋼板を連続的に管状に成形するフォーミング装置5と、鋼板を連続的に管状成形する直前に鋼板に所望の金属を溶射する内面溶射装置4と、管状に成形されためっき鋼板の長手方向端面接合部を連続的に溶接して管状体を形成する溶接装置7と、管状体の外面に成形された溶接ビード部を連続的に切削する切削装置8と、管状体の外面に連続的に溶融亜鉛めっきして溶融亜鉛めっき鋼管を形成する溶融亜鉛めっき装置11と、を少なくとも含む。
Hereinafter, embodiments of the present invention will be described in detail.
The manufacturing method of the thermal spray metal steel pipe of this embodiment is comprised by the manufacturing line shown in FIG. This production line consists of an uncoiler 2 that continuously supplies a long steel sheet wound around a coil 1, a forming device 5 that continuously forms the steel sheet supplied from the uncoiler 2 into a tubular shape, and a continuous steel sheet. An inner surface spraying device 4 that sprays a desired metal on a steel plate immediately before being formed into a tubular shape, and a welding device 7 that continuously welds the longitudinal end surface joint portion of the plated steel plate formed into a tubular shape to form a tubular body, A cutting device 8 that continuously cuts the weld bead formed on the outer surface of the tubular body, and a hot dip galvanizing device 11 that continuously hot dip galvanizes the outer surface of the tubular body to form a hot dip galvanized steel pipe. Including at least.
また、上記構成から、鋼板を連続的に管状成形する直前に設置された内面溶射装置4を除き、代わりに溶融亜鉛めっき装置11の後に、溶融亜鉛めっき装置後に溶射する外面溶射装置12を必要に応じて備えることができる。
また、製造工程中に、内面溶射装置4と外面溶射装置12をともに設けることもできる。これらは、製造しようとする鋼管の仕様による。
In addition, from the above configuration, except for the inner surface spraying device 4 installed immediately before the tubular forming of the steel sheet continuously, instead of the hot dip galvanizing device 11, an outer surface spraying device 12 for spraying after the hot dip galvanizing device is required. Can be provided accordingly.
Further, both the inner surface spraying device 4 and the outer surface spraying device 12 can be provided during the manufacturing process. These depend on the specifications of the steel pipe to be manufactured.
必要に応じて、管状体の外面の洗浄及び酸化防止用のフラックス液を連続的に塗布するフラックス塗布装置9と、管状体の外面を乾燥させるとともに管状体を予備加熱する予備加熱装置10を設けてもよい。また、上記のようにして製造された溶融亜鉛めっき鋼管を規格の寸法に成形するサイジング装置13と、溶融亜鉛めっき鋼管を所定の長さに切断する切断装置14とを備えてもよい。 If necessary, a flux application device 9 for continuously applying a flux liquid for cleaning and preventing the outer surface of the tubular body and a preheating device 10 for drying the outer surface of the tubular body and preheating the tubular body are provided. May be. Further, a sizing device 13 for forming the hot-dip galvanized steel pipe manufactured as described above into a standard size and a cutting device 14 for cutting the hot-dip galvanized steel pipe into a predetermined length may be provided.
次に、上記の製造ラインを用いた本発明の製造方法について説明する。 Next, the manufacturing method of the present invention using the above manufacturing line will be described.
まず、コイル状に巻回された鋼板がアンコイラー2からライン下流に向かって連続的に供給される。
供給された鋼板は、フォーミング装置5に引き込まれるとともに溶射装置4によって溶射され管状に冷間成形される。なお、溶射は鋼板の一面に行われることが好ましく、溶射された面はフォーミングされた管の内面であることが好ましい。また、溶射はフォーミングの開始前でも、フォーミングが開始された後でも構わない。続いて、溶接装置7により、鋼板の長手方向端面接合部が連続的に溶接されて、連続する一本の管状体6が形成される。
First, a steel sheet wound in a coil shape is continuously supplied from the uncoiler 2 toward the downstream of the line.
The supplied steel sheet is drawn into the forming device 5 and sprayed by the spraying device 4 to be cold-formed into a tubular shape. The thermal spraying is preferably performed on one surface of the steel plate, and the sprayed surface is preferably the inner surface of the formed tube. The thermal spraying may be performed before the start of forming or after the start of forming. Subsequently, the welding device 7 continuously welds the longitudinal end surface joining portions of the steel plates to form one continuous tubular body 6.
次に、管状体6は、管状体6の外面に沿う形状の刃物を取付けてなる切削装置8に送られる。そして、管状体6の外面に形成された溶接ビード部が切削装置8の刃物によって削り落とされ、管状体6の外面が滑らかに形成される。 Next, the tubular body 6 is sent to a cutting device 8 to which a cutter having a shape along the outer surface of the tubular body 6 is attached. Then, the weld bead portion formed on the outer surface of the tubular body 6 is scraped off by the cutting tool of the cutting device 8, and the outer surface of the tubular body 6 is smoothly formed.
その後、管状体はフラックス塗布装置9に送られて、管状体の外面に洗浄化及び酸化防止用のフラックス液が塗布される。
管状体6は予備加熱装置10に送られ余熱され、その外面は乾燥される。
Thereafter, the tubular body is sent to the flux applying device 9, and a flux liquid for cleaning and antioxidant is applied to the outer surface of the tubular body.
The tubular body 6 is sent to the preheating device 10 to be preheated, and the outer surface thereof is dried.
その後、管状体は溶融亜鉛めっき装置11に送られる。管状体6は溶融亜鉛めっき装置11において、ポンプアップされた溶融亜鉛が満たされた上部めっき槽内にてドブ漬けされて、外面全体に溶融亜鉛めっきされる。上部めっき槽内にてドブ漬けされた管状体6は健全な合金層を有する溶融亜鉛めっき層が形成されて、溶融亜鉛めっき鋼管となる。そして、ワイピング装置(図示せず)において余分の溶融亜鉛めっきが除去された後、外面溶射装置12によって溶射金属めっき鋼管40となる。その後、冷却される。 Thereafter, the tubular body is sent to the hot dip galvanizing apparatus 11. In the hot dip galvanizing apparatus 11, the tubular body 6 is immersed in the upper plating tank filled with the pumped up hot dip, and the entire outer surface is hot dip galvanized. The tubular body 6 soaked in the upper plating tank is formed with a hot dip galvanized layer having a healthy alloy layer to form a hot dip galvanized steel pipe. Then, after the excess hot dip galvanizing is removed by a wiping device (not shown), the outer surface spraying device 12 becomes a sprayed metal plated steel pipe 40. Then it is cooled.
このとき、外面溶射装置12による溶射は、溶融亜鉛めっき層の表面温度が周囲温度まで冷却しない時期に行うことを要する。一般に、冷却された金属面に形成された溶射金属層は、金属表面の凹凸にくまなく形成されることによって、その凹凸によるアンカー効果のみで結合力を確保する。しかし、本願発明のように、溶融亜鉛めっき層の表面温度が周囲温度まで低下しない条件で溶射を行うと、溶射金属の一部が溶融亜鉛めっき層中に入り込んだり、溶融亜鉛めっき層と溶射層との間に合金層を形成したり、元素拡散層を形成したりし、結合力をアンカー効果以外の要因によって向上させることが可能となる。 At this time, the thermal spraying by the outer surface spraying device 12 needs to be performed when the surface temperature of the hot-dip galvanized layer is not cooled to the ambient temperature. Generally, a sprayed metal layer formed on a cooled metal surface is formed all over the unevenness of the metal surface, thereby ensuring a binding force only by an anchor effect due to the unevenness. However, when the thermal spraying is performed under the condition that the surface temperature of the hot dip galvanized layer does not decrease to the ambient temperature as in the present invention, a part of the sprayed metal enters the hot dip galvanized layer or the hot dip galvanized layer and the sprayed layer. It is possible to form an alloy layer between them and an element diffusion layer to improve the bonding force due to factors other than the anchor effect.
本願発明においては、好ましくは、溶融亜鉛めっき層の表面温度が周囲温度よりも高い状態で溶射を行うことが望ましい。より好ましくは、溶融亜鉛めっき層の表面が、半溶融状態であることが好ましい。半溶融状態とは、めっき層にかかる金属層が固液共存領域を有する組成の金属の場合は、かかる固液共存領域温度ないしはそこから数10℃、最大でも100℃程度低下した温度のことをいう。純金属がめっき層の場合は、固液共存領域温度が存在しないが、この場合もほぼ同様に考えてよい。本願発明に好適な半溶融状態にかかる温度は、めっき層と溶射金属層の組合せにより変動する。一般には、めっき層と溶射層との間の元素拡散や合金化、その他アンカー効果とは異なるメカニズムにより結合力を得ることができる程度の高温であれば、本願発明の目的には適用可能である。 In the present invention, preferably, the thermal spraying is performed in a state where the surface temperature of the hot-dip galvanized layer is higher than the ambient temperature. More preferably, the surface of the hot dip galvanized layer is preferably in a semi-molten state. The semi-molten state refers to the solid-liquid coexistence region temperature or a temperature lowered by several tens of degrees Celsius, or at most about 100 ° C, when the metal layer applied to the plating layer is a metal having a solid-liquid coexistence region. Say. In the case where the pure metal is a plating layer, there is no solid-liquid coexistence region temperature, but in this case, the same may be considered. The temperature required for the semi-molten state suitable for the present invention varies depending on the combination of the plating layer and the sprayed metal layer. In general, it is applicable to the object of the present invention as long as the bonding force can be obtained by a mechanism different from the element diffusion, alloying, and other anchor effects between the plating layer and the sprayed layer. .
本実施態様において、溶射による金属層は管の周方向に全面に形成される必要がある。そこで、本実施態様において、外面溶射装置は120°ずつ隔たった3方から溶射ノズルを設け、金属溶射を行う。180°隔たった2方からの溶射でも溶射金属層を形成することは可能であるが、3方以上に溶射ノズルを設け、溶射金属層を形成することが望ましい。 In this embodiment, the metal layer by thermal spraying needs to be formed on the entire surface in the circumferential direction of the tube. Therefore, in the present embodiment, the outer surface spraying apparatus is provided with spray nozzles from three directions separated by 120 ° to perform metal spraying. Although it is possible to form a sprayed metal layer by spraying from two directions separated by 180 °, it is desirable to provide a spray nozzle on three or more sides to form the sprayed metal layer.
そして、溶射金属めっき鋼管40は、外形を規格寸法とするため、サイジング装置13において冷間ロール加工される。本実施態様において、冷間ロール加工は溶射層を周方向に比較的均一な厚さとするためにも必要な工程である。つまり、外面溶射装置によって形成された直後の溶射金属層は周方向に不均一な厚さを有している場合でも、その後の冷間ロール加工等の工程を経ることにより溶射金属層を比較的均一な厚さにならすことができる。このように、本願発明の好適な実施態様においては、外面溶射装置による溶射金属層の形成後に、例えば、冷間ロール加工等のサイジング加工等を行い、溶射により形成された溶射金属層を比較的均一な厚さにする工程(溶射金属層を形成した直後よりも厚さの分布を均一にする工程)が採用されることが望ましい。 The sprayed metal-plated steel pipe 40 is cold-rolled by the sizing device 13 in order to set the outer shape to the standard dimension. In this embodiment, the cold roll process is a process necessary to make the sprayed layer have a relatively uniform thickness in the circumferential direction. In other words, even if the sprayed metal layer immediately after being formed by the outer surface spraying apparatus has a non-uniform thickness in the circumferential direction, the sprayed metal layer is comparatively formed through a subsequent process such as cold roll processing. A uniform thickness can be achieved. Thus, in a preferred embodiment of the present invention, after forming the sprayed metal layer by the outer surface spraying apparatus, for example, sizing processing such as cold roll processing is performed, and the sprayed metal layer formed by spraying is relatively It is desirable to adopt a step of making the thickness uniform (a step of making the thickness distribution more uniform than immediately after forming the sprayed metal layer).
溶射金属めっき鋼管は、切断装置14により、所定の長さに切断され、鋼管製品15となる。 The thermally sprayed metal-plated steel pipe is cut into a predetermined length by a cutting device 14 to become a steel pipe product 15.
以上の構成による溶射金属めっき鋼管の製造方法によれば、図2に示すように、溶融亜鉛めっき層が形成された管状体6に、溶射金属層Mをその内面に、溶射金属層Oをその外面に形成することにより、耐食性に優れた防錆効果の高い溶射金属鋼管を連続的に得ることができる。なお、図2において、亜鉛めっき層Nの外周に溶射金属層Oが形成されている。 According to the method of manufacturing a sprayed metal plated steel pipe having the above configuration, as shown in FIG. 2, the sprayed metal layer M is applied to the inner surface of the tubular body 6 on which the hot dip galvanized layer is formed, and the sprayed metal layer O is applied to the tubular body 6. By forming it on the outer surface, a thermally sprayed metal steel pipe having excellent corrosion resistance and a high rust prevention effect can be obtained continuously. In FIG. 2, a sprayed metal layer O is formed on the outer periphery of the galvanized layer N.
なお、本発明は上記の実施形態には限定されない。例えば、本実施の形態では、内外面両面に溶射装置による溶射金属層を形成したが、内面もしくは外面のみに溶射装置による溶射金属層を設けても構わない。また、外面のみに溶射金属層を設ける場合、両面めっき鋼板を用いれば、内面にめっき層が設けられ、外面には二重金属層(めっき層+溶射金属層)を設けた鋼管を製造することが可能である。さらに、一面にめっき層が設けられた金属鋼板を利用する場合は、めっき層が設けられていない面にのみ溶射装置により溶射金属層を形成し、管の内外面ともに金属層を設けて、防食効果を高めることも可能である。 In addition, this invention is not limited to said embodiment. For example, in the present embodiment, the sprayed metal layer is formed on both the inner and outer surfaces by the thermal spraying device, but the sprayed metal layer by the thermal spraying device may be provided only on the inner surface or the outer surface. In addition, when a sprayed metal layer is provided only on the outer surface, if a double-sided plated steel plate is used, a steel pipe having a plated layer on the inner surface and a double metal layer (plating layer + sprayed metal layer) on the outer surface can be manufactured. Is possible. In addition, when using a metal steel plate with a plating layer on one side, the sprayed metal layer is formed only on the surface on which the plating layer is not provided, and the metal layer is provided on both the inner and outer surfaces of the pipe to prevent corrosion. It is also possible to increase the effect.
また、溶射金属層の上面を合成樹脂等による保護被膜で被覆してもよい。このようにすれば、溶射金属鋼管の防錆効果をより向上させることができる。 Alternatively, the upper surface of the sprayed metal layer may be covered with a protective film made of synthetic resin or the like. If it does in this way, the rust prevention effect of a thermal spray metal steel pipe can be improved more.
さらに、本実施形態では、鋼管に施されるめっきとして溶融亜鉛を適用したが、必要に応じて他の金属を適用してもよい。また、本実施態様では、鋼板を使用することを前提に説明したが、本願発明は他の金属板を使用することを前提にしても良い。このような金属板としては、例えば、銅テープ、アルミテープなどが考えられるがこれに限定されない。 Furthermore, in this embodiment, although molten zinc was applied as plating applied to a steel pipe, you may apply another metal as needed. Moreover, although this embodiment demonstrated on the assumption that a steel plate was used, you may presuppose that this invention uses another metal plate. Examples of such a metal plate include, but are not limited to, copper tape and aluminum tape.
本願発明にかかる表面処理方法は、金属管のみならず、あらゆる金属部材に適用可能である。そのような金属部材は、例えば、第一の成分を有する金属にかかる溶融金属めっきを金属表面に施して第一の金属層を形成し、第一の金属層の表面に第二の成分を有する金属を溶射して表面層を形成し、この表面層において、第一及び第二の成分を有する金属とが、渾然一体となっていることを特徴とする金属表面を有するものである。 The surface treatment method according to the present invention can be applied not only to a metal tube but also to any metal member. Such a metal member has, for example, a first metal layer formed by applying molten metal plating on a metal having a first component to the metal surface, and has a second component on the surface of the first metal layer. A metal is thermally sprayed to form a surface layer, and the surface layer has a metal surface characterized in that the metal having the first and second components is naturally integrated.
以下、本発明の溶射金属鋼管を製造する実施例を示す。
(実施例1)
溶射金属としてアルミニウムを使用。厚さ1.2mm、幅59.5mmの長尺の圧延鋼板を、図1に示す製造ラインにセットして、ショットブラスト装置により内面にショットブラスと加工を施した後、内面に溶射装置にて溶射金属層を形成した。また、溶融亜鉛めっき装置後、外面溶射装置にてアルミニウムの溶射を行った。
本発明においては、溶射時の亜鉛表面温度(常温〜450℃)、ライン速度(0〜400m/min)、溶射角度(0〜90°)等の条件を適宜組み合わせることができる。これとともに、溶射アルミの量を調整することでアルミの結合濃度及び分布を調整出来る。
Hereinafter, the Example which manufactures the thermal spray metal steel pipe of this invention is shown.
(Example 1)
Aluminum is used as the spray metal. A long rolled steel sheet with a thickness of 1.2mm and a width of 59.5mm is set on the production line shown in Fig. 1. After shot blasting and machining the inner surface with a shot blasting device, the inner surface is sprayed with a thermal spraying device. A layer was formed. Further, after the hot dip galvanizing apparatus, aluminum was sprayed by an outer surface spraying apparatus.
In the present invention, conditions such as the zinc surface temperature during spraying (room temperature to 450 ° C.), the line speed (0 to 400 m / min), and the spray angle (0 to 90 °) can be appropriately combined. At the same time, the bond concentration and distribution of aluminum can be adjusted by adjusting the amount of sprayed aluminum.
図5に実施例1によって製造された鋼管と、従来例である溶融メッキ法で製造された鋼管との外観の比較を示す。従来法である溶融メッキ法によれば、その表面は独特の結晶粒界を反映した模様(スパングル)を示すのに対し(図5(a))、実施例1の溶射によって製造された鋼管の表面は粗い粒状である(図5(b))。荒い粒状の表面を有するメッキ鋼管は本出願時点で公知ではなく、かかる表面を有するメッキ鋼管は本願発明の方法によって生産されたものと推定される。また、実施例1によって製造された鋼管をサンドペーパーで研磨したものの外観を示す(図5(c))。サンドペーパーで研磨したものは、金属光沢をしているが、溶射特有の点状のくぼみまたは孔を有しており、かかる外観のものも本願発明の方法によって生産されたものと推定される。 FIG. 5 shows a comparison in appearance between the steel pipe manufactured according to Example 1 and the steel pipe manufactured by the conventional hot dipping method. According to the conventional hot-dip plating method, the surface shows a pattern (spangle) reflecting a unique grain boundary (FIG. 5 (a)), whereas the steel pipe manufactured by the thermal spraying of Example 1 is used. The surface is rough and granular (FIG. 5 (b)). A plated steel pipe having a rough granular surface is not known at the time of this application, and it is presumed that a plated steel pipe having such a surface was produced by the method of the present invention. Moreover, the external appearance of what grind | polished the steel pipe manufactured by Example 1 with the sandpaper is shown (FIG.5 (c)). The material polished with sandpaper has a metallic luster, but has dot-like depressions or holes peculiar to thermal spraying, and such an appearance is presumed to have been produced by the method of the present invention.
図3に、実施例1にて製造した製品にかかるAl元素分布結果の模式図を示す。(外面溶射金属層について元素分析の結果、亜鉛層の中に島状に溶射金属(アルミ)が点在している様子20が確認される。また、図4は、別の条件で溶射を行ったときのAl元素分析の結果である。図3とは異なり、Alは鋼線(St)の近傍に偏析し、Znとは異なった位置かつ溶射方向からみて遠い位置である鋼線近傍に層状に分布している。このように、本願発明にかかる方法で製造しためっき層においては、素地金属中に溶射金属が島状に点在したり、層状に分布したりすることが一つの特徴である。また、実施例1においては、アンカー効果のみでめっき層と溶射層とが結合しているわけではないことは明らかである。 In FIG. 3, the schematic diagram of the Al element distribution result concerning the product manufactured in Example 1 is shown. (As a result of elemental analysis of the outer surface sprayed metal layer, it is confirmed that the sprayed metal (aluminum) is scattered in an island shape in the zinc layer. In addition, FIG. 3 shows the results of Al elemental analysis, unlike in Fig. 3. Al segregates in the vicinity of the steel wire (St) and forms a layer in the vicinity of the steel wire that is different from Zn and far from the spraying direction. Thus, in the plating layer manufactured by the method according to the present invention, one feature is that the sprayed metal is scattered in the base metal in an island shape or distributed in a layer shape. In Example 1, it is clear that the plating layer and the sprayed layer are not bonded only by the anchor effect.
なお、この島状分布、層状分布は本願発明にかかる製造方法を用いたときの特徴の一つであるが、本願発明にかかる製造方法を適用した後に、熱処理等をすることによるこの特徴が消失することもあり得る。このような特徴を具備するめっき層は、本願発明により製造されたとの推定は可能である。 This island-shaped distribution and layered distribution are one of the characteristics when the manufacturing method according to the present invention is used. However, after applying the manufacturing method according to the present invention, this characteristic disappears by heat treatment or the like. It is possible to do. It can be estimated that the plating layer having such characteristics is manufactured according to the present invention.
このような分布になる原理の詳細を推測すると、従来の複数回の溶融めっきと比べ、本願発明にかかる製造方法によればめっき素地金属と異なる金属を物理力によって照射する溶射という方式を採用しているので、少なくとも、溶射時のめっき素地金属の温度(表面等の硬度に影響する)、溶射時の溶射金属の温度(溶射金属の硬度に影響する)、溶射金属がめっき素地金属に達する速度(運動エネルギー)によって、めっき素地金属と溶射金属との分布状況が左右されるためである。これらの要因によって、溶射金属が比較的表面近傍に対流するような条件であると、図3のような分布を形成する。他方、溶射金属が鋼線(St)表面近傍まで達するような条件であると、図4のような分布を形成しうる。 Assuming the details of the principle of such distribution, compared to the conventional multiple times of hot dipping, according to the manufacturing method according to the present invention, a method called thermal spraying that irradiates a metal different from the plating base metal with physical force is adopted. Therefore, at least the temperature of the plating base metal during spraying (which affects the hardness of the surface, etc.), the temperature of the spraying metal during spraying (which affects the hardness of the sprayed metal), and the speed at which the sprayed metal reaches the plating base metal This is because (the kinetic energy) affects the distribution state of the plating base metal and the sprayed metal. Due to these factors, the distribution as shown in FIG. 3 is formed under the condition that the sprayed metal convects relatively near the surface. On the other hand, when the conditions are such that the sprayed metal reaches the vicinity of the surface of the steel wire (St), a distribution as shown in FIG. 4 can be formed.
(実施例2)
溶射金属としてアルミニウムニウムを使用し、厚さ1.2mm、幅59.5mmの長尺の圧延鋼板を図1に示す製造ラインにセットして、ショットブラスと装置により内面にショットブラスト加工をした後、内面に溶射装置によって溶射金属層を形成した。また、溶融亜鉛メッキ後、外面溶射装置によってアルミニウムニウムの溶射を行った。
(Example 2)
Aluminum steel is used as the thermal spray metal, a long rolled steel plate with a thickness of 1.2mm and a width of 59.5mm is set on the production line shown in Fig. 1, and shot blasting is performed on the inner surface with shot blasting and equipment. A sprayed metal layer was formed by a spraying device. Moreover, after the hot dip galvanization, thermal spraying of aluminum was performed by an outer surface spraying device.
得られた断面の外観写真を図6(a)、その断面の元素分布についてEPMAで測定したチャートを図6(b)に示す。図6(a)に示すとおり、本実施例によるものでも、素地金属中に溶射金属が細かく島状に点在するという特徴が見られた。白っぽい亜鉛素地に細かく黒っぽいアルミニウムが点在していることがわかる。また、図6(b)に示すとおり、本実施例により製造された鋼管においては、亜鉛とアルミニウムは比較的均一な濃度で分布していた。 FIG. 6A shows an appearance photograph of the obtained cross section, and FIG. 6B shows a chart obtained by measuring the element distribution of the cross section with EPMA. As shown in FIG. 6 (a), the feature of this example was that the spray metal was finely scattered in the form of islands in the base metal. It can be seen that fine and dark aluminum is scattered on the whitish zinc base. In addition, as shown in FIG. 6B, in the steel pipe manufactured according to this example, zinc and aluminum were distributed at a relatively uniform concentration.
(実施例3)
溶射金属としてアルミニウムニウムを使用し、厚さ1.2mm、幅59.5mmの長尺の圧延鋼板を図1に示す製造ラインにセットして、ショットブラスと装置により内面にショットブラスト加工をした後、内面に溶射装置によって溶射金属層を形成した。また、溶融亜鉛メッキ装置後、外面溶射装置によってアルミニウムニウムの溶射を行った。本実施例においては、亜鉛メッキ表面温度を約400℃にし、20m/min程度の低速生産中に溶射角度90°でアルミを15g/min溶射をした。亜鉛と溶射アルミの接触部が溶解しアルミとの結合を促し、表面にアルミ層、中間に亜鉛-アルミ層、内層に亜鉛層の分布を得ることができる。この組織はライン速度・亜鉛メッキ表面温度・アルミ溶射量等の一連の相関関係により中高速の生産でも実現可能である。
Example 3
Aluminum steel is used as the thermal spray metal, a long rolled steel plate with a thickness of 1.2mm and a width of 59.5mm is set on the production line shown in Fig. 1, and shot blasting is performed on the inner surface with shot blasting and equipment. A sprayed metal layer was formed by a spraying device. In addition, after the hot dip galvanizing apparatus, aluminum was sprayed by an outer surface spraying apparatus. In this example, the surface temperature of the galvanized plate was about 400 ° C., and aluminum was sprayed at 15 g / min at a spray angle of 90 ° during low-speed production of about 20 m / min. The contact portion between the zinc and the sprayed aluminum melts and promotes bonding with the aluminum, and a distribution of the aluminum layer on the surface, the zinc-aluminum layer in the middle, and the zinc layer on the inner layer can be obtained. This structure can also be realized in medium to high speed production by a series of correlations such as line speed, galvanized surface temperature, and aluminum spray amount.
得られた断面を図7(a)、その断面の元素分布についてEPMAで測定したチャートを図7(b)に示す。図7(a)に示すとおり、本実施例によるものは、表面にアルミニウム(黒っぽい部分)が偏在し、鋼芯との界面に亜鉛(白っぽい部分)が存在していた。元素分布をより詳細に元素分析してみると、図7に示すように表面はほぼ純アルミニウム層を形成しており、漸次アルミニウムと亜鉛の濃度が逆転する分布を示していた。このような元素分布になる理由は定かではないが、溶射時のアルミニウムの溶融温度、被溶射金属層である亜鉛の温度、溶射金属粒の初期速度(運動エネルギー)などによって、被溶射金属である亜鉛中にアルミニウムが潜り込む深さが変化することによるものであると考えられる。このことは、これらのパラメータを調整することによって、任意に金属層中の元素分布を制御することのできる可能性を示唆する。 FIG. 7A shows the obtained cross section, and FIG. 7B shows a chart obtained by measuring the element distribution of the cross section with EPMA. As shown in FIG. 7 (a), in this example, aluminum (blackish portion) was unevenly distributed on the surface, and zinc (whitish portion) was present at the interface with the steel core. When the elemental distribution was analyzed in more detail, as shown in FIG. 7, the surface almost formed a pure aluminum layer and showed a distribution in which the concentrations of aluminum and zinc were gradually reversed. The reason for this element distribution is not clear, but it is a metal to be sprayed depending on the melting temperature of aluminum during spraying, the temperature of zinc as the sprayed metal layer, the initial velocity (kinetic energy) of the sprayed metal particles, etc. This is thought to be due to the change in the depth of aluminum in the zinc. This suggests the possibility that the element distribution in the metal layer can be arbitrarily controlled by adjusting these parameters.
本実施例のものは表面から深さ50μm程度までほぼ純度100%のアルミニウム層で構成されており、それよりも深い部分はアルミニウム・亜鉛合金層となっている。一般に、純アルミニウムは耐食性が高いので、このような元素分布のものの方がメッキ鋼管としての耐食性が高い。耐食性が高まる原因として、アルミニウム層中に微細な欠陥(ピンホール)が存在した場合でも、亜鉛層が犠牲防食的な作用を呈し、アルミニウムとは別の機能により耐食機能を分担することにもある。本願発明によれば表面に純アルミニウム層を有し、その内部にアルミニウム・亜鉛合金層ないしは亜鉛層を具備するものを得ることができる。その場合、純アルミニウム層は、全メッキ層の厚さの30%以上、好ましくは50%以上の厚さを有することが好ましい。また、表面のアルミニウム層は純度100%のアルミニウム層であることは必ずしも必要ではなく、100%アルミニウムと実質的に同等な耐食性を有せば構わない。かかる観点から1〜5%程度の亜鉛などの他元素の混入は許容範囲である。 In this embodiment, an aluminum layer having a purity of almost 100% is formed from the surface to a depth of about 50 μm, and the deeper portion is an aluminum / zinc alloy layer. In general, pure aluminum has higher corrosion resistance, and those with such an element distribution have higher corrosion resistance as a plated steel pipe. The cause of the increased corrosion resistance is that even when fine defects (pinholes) are present in the aluminum layer, the zinc layer exhibits a sacrificial anticorrosive action, and the corrosion resistance function is shared by a function different from that of aluminum. . According to the present invention, it is possible to obtain one having a pure aluminum layer on the surface and an aluminum / zinc alloy layer or zinc layer inside. In that case, the pure aluminum layer preferably has a thickness of 30% or more, preferably 50% or more of the total plating layer thickness. Further, the aluminum layer on the surface is not necessarily an aluminum layer having a purity of 100%, and may have corrosion resistance substantially equivalent to 100% aluminum. From this point of view, mixing of other elements such as zinc of about 1 to 5% is acceptable.
このことは、本願発明にかかる製造プロセスを採用することにより、めっき層の組成のみならず、金属分布も制御できることを示す。 This indicates that not only the composition of the plating layer but also the metal distribution can be controlled by employing the manufacturing process according to the present invention.
本明細書において、溶融金属めっきに使用する金属として亜鉛を例に説明したが、これに限定されない。例えば、亜鉛にアルミやその他の金属を含む合金、錫等、他の金属であってもよい。また、溶射する金属としてアルミを例に説明したが、これに限定されない。たとえば、亜鉛、マグネシウム、その他の金属であってもかまわない。本願発明は、製造方法にかかる発明を含み、少なくとも製造方法の発明においては、金属・合金種を問うものではない。 In this specification, although zinc was demonstrated to the example as a metal used for molten metal plating, it is not limited to this. For example, other metals such as an alloy containing aluminum or other metals in zinc, tin, or the like may be used. Moreover, although aluminum was demonstrated to the example as a metal to spray, it is not limited to this. For example, zinc, magnesium, and other metals may be used. The invention of the present application includes an invention relating to a manufacturing method, and at least the invention of the manufacturing method does not ask for the type of metal / alloy.
1
鋼板
3 ショットブラスト装置
4 内面溶射装置(内面溶射をする工程)
5
フォーミング装置(鋼板を管状に成形する工程)
6 管状体管
40 溶射金属めっき鋼
7
溶接装置(鋼板の長手方向端面接合部を溶接して鋼管とする工程)
8
切削装置(鋼管の外面に形成された溶接ビード部を切削する工程)
11 溶融亜鉛めっき装置(鋼管の外面に連続的に溶融めっきする工程)
12 外面溶射装置(外面溶射をする工程)
13 サイジング装置(外径を規格寸法にする工程)
14 切断装置(所定の長さに切断する工程)
15 鋼管製品
M 内面溶射金属層
N 溶融亜鉛めっき層
O 外面溶射金属層
1
steel sheet
3 Shot blasting equipment
4 Inner surface spraying device (inner surface spraying process)
Five
Forming device (process to form steel plate into a tube)
6 Tubular body tube
40 Thermal sprayed metal plated steel
7
Welding device (the process of welding the longitudinal direction end face joints of steel plates to make steel pipes)
8
Cutting device (process of cutting the weld bead formed on the outer surface of the steel pipe)
11 Hot dip galvanizing equipment (process for continuous hot dip plating on the outer surface of steel pipes)
12 External spraying device (process to perform external spraying)
13 Sizing device (process to make the outer diameter a standard dimension)
14 Cutting device (process to cut to a predetermined length)
15 Steel pipe product M Inner surface sprayed metal layer N Hot-dip galvanized layer O Outer surface sprayed metal layer
Claims (9)
前記第一の金属管部分のいずれかの表面に、直接に、または、前記第一の組成成分とは異なる組成成分よりなる金属層を介して形成された第二の金属層であって、当該第二の金属層が周方向及び長手方向に連続して溶射工程によって形成されている第二の金属層と、
を具備する、金属管。 A first metal tube portion comprising a first composition component, wherein at least a part of a cross section of the first metal tube portion has a melt joint portion continuous in the longitudinal direction;
A second metal layer formed on any surface of the first metal tube portion directly or via a metal layer made of a composition component different from the first composition component, A second metal layer formed by a thermal spraying process continuously in a circumferential direction and a longitudinal direction of the second metal layer;
A metal tube comprising:
前記連続溶接前に前記金属板の少なくとも一面に、前記金属板の全幅にわたって前記第一の組成成分とは異なる第二の組成成分からなる金属層を溶射により形成する、金属管の製造方法。 In the method for manufacturing a metal tube, a metal plate formed of a first composition component is continuously formed into a tubular shape, and a welded end is continuously welded to form a metal tube.
A method of manufacturing a metal tube, wherein a metal layer comprising a second composition component different from the first composition component is formed on at least one surface of the metal plate before the continuous welding over the entire width of the metal plate by thermal spraying.
前記連続溶接後に前記金属管の表面に直接に、円周方向及び長手方向に不連続がない前記第一の組成成分とは異なる第二の組成成分からなる金属層を溶射により形成する、金属管の製造方法。 In the method for manufacturing a metal tube, a metal plate formed of a first composition component is continuously formed into a tubular shape, and a welded end is continuously welded to form a metal tube.
A metal tube formed by spraying a metal layer made of a second composition component different from the first composition component without discontinuity in the circumferential direction and the longitudinal direction directly on the surface of the metal tube after the continuous welding. Manufacturing method.
前記連続溶接後に前記金属管の表面に、前記第一の組成成分とは異なる組成成分よりなる金属層を介して、円周方向及び長手方向に不連続がない金属層を溶射により形成する、金属管の製造方法。 In the method for manufacturing a metal tube, a metal plate formed of a first composition component is continuously formed into a tubular shape, and a welded end is continuously welded to form a metal tube.
Forming a metal layer having no discontinuity in the circumferential direction and the longitudinal direction by thermal spraying on the surface of the metal tube after the continuous welding via a metal layer made of a composition component different from the first composition component; A method of manufacturing a tube.
上記第一の金属層の表面に溶射により形成された第二の成分を有する第二の金属部分とを具備し、
上記第一の金属層中に上記第二の金属部分が島状に点在することを特徴とする、金属管。 A first metal layer having a first component formed by molten metal plating directly on the surface of the metal tube or via a metal layer made of a composition component different from the composition component of the metal tube;
A second metal portion having a second component formed by thermal spraying on the surface of the first metal layer,
The metal tube, wherein the second metal portion is scattered in an island shape in the first metal layer.
上記第一の金属層の表面に溶射により形成された第二の成分を有する第二の金属部分とを具備し、
上記第一の金属層中に上記第二の金属部分が層状に分布することを特徴とする、金属管。 A first metal layer having a first component formed by molten metal plating directly on the surface of the metal tube or via a metal layer made of a composition component different from the composition component of the metal tube;
A second metal portion having a second component formed by thermal spraying on the surface of the first metal layer,
The metal tube, wherein the second metal portion is distributed in a layered manner in the first metal layer.
上記亜鉛層の表面に溶射により形成されたアルミニウム層を具備し、
上記アルミニウム層が上記亜鉛層と上記アルミニウム層の合計厚さの30%以上の厚さを有している、金属管。 A zinc layer formed by molten metal plating directly on the surface of the metal tube or via a metal layer made of a composition component different from the composition component of the metal tube;
Comprising an aluminum layer formed by thermal spraying on the surface of the zinc layer;
The metal tube, wherein the aluminum layer has a thickness of 30% or more of the total thickness of the zinc layer and the aluminum layer.
The metal tube according to claim 7 or 8, wherein the metal tube has a rough granular surface, or has a metallic luster and point-like holes.
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DE102019108033A1 (en) * | 2019-02-25 | 2020-08-27 | Fontaine Holdings Nv | Process for galvanizing, in particular hot-dip galvanizing, of iron and steel products |
CN114559262A (en) * | 2022-03-17 | 2022-05-31 | 十堰市立可高工贸有限公司 | Hot rolled steel coil uncoiling shot blasting, longitudinal shearing and coiling integrated collinear processing system |
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JPS5767158A (en) * | 1980-10-07 | 1982-04-23 | Maki Seisakusho:Kk | Production of metal heat sprayed clad steel |
JPS6230867A (en) * | 1985-08-02 | 1987-02-09 | Nisshin Steel Co Ltd | Surface treated steel pipe having high corrosion resistance |
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JPS5767158A (en) * | 1980-10-07 | 1982-04-23 | Maki Seisakusho:Kk | Production of metal heat sprayed clad steel |
JPS6230867A (en) * | 1985-08-02 | 1987-02-09 | Nisshin Steel Co Ltd | Surface treated steel pipe having high corrosion resistance |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102019108033A1 (en) * | 2019-02-25 | 2020-08-27 | Fontaine Holdings Nv | Process for galvanizing, in particular hot-dip galvanizing, of iron and steel products |
CN114559262A (en) * | 2022-03-17 | 2022-05-31 | 十堰市立可高工贸有限公司 | Hot rolled steel coil uncoiling shot blasting, longitudinal shearing and coiling integrated collinear processing system |
CN114559262B (en) * | 2022-03-17 | 2024-04-05 | 十堰市立可高工贸有限公司 | Integrated collinear processing system for uncoiling, shot blasting, longitudinal shearing and rolling of hot rolled steel coil |
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