JPS591669A - Manufacture of double-layered steel pipe - Google Patents
Manufacture of double-layered steel pipeInfo
- Publication number
- JPS591669A JPS591669A JP11226882A JP11226882A JPS591669A JP S591669 A JPS591669 A JP S591669A JP 11226882 A JP11226882 A JP 11226882A JP 11226882 A JP11226882 A JP 11226882A JP S591669 A JPS591669 A JP S591669A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- heat treatment
- pipe
- metal
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は、複層鋼管の製造方法に関するものである。[Detailed description of the invention] The present invention relates to a method for manufacturing multilayer steel pipes.
一般に、複層金属管は、２種以上の金属により内層、中
間層、外層等を形成したものであって、通常、量的に少
ない金属層により耐食性、耐硫化水素割れ性、耐摩耗性
を付与し、特殊雰囲気での使用と可能にすること、苛酷
な条件下における特殊用途に適用させること等を目的と
しており、一般に比較的安価な金属管を母材として、他
の金属全接合することにより製造される。In general, multi-layer metal pipes have an inner layer, intermediate layer, outer layer, etc. made of two or more metals, and usually have corrosion resistance, hydrogen sulfide cracking resistance, and abrasion resistance due to a small amount of metal layers. It is intended to be used in special atmospheres and for special purposes under harsh conditions, and generally involves joining all other metals using a relatively inexpensive metal pipe as the base material. Manufactured by.
従来、例えば母材として炭素鋼を用い、内層材トシてス
テンレス鋼を用いた２層構造のクラツド鋼管は、例えば
鋳込みクラッド法、肉盛りクラッド法、爆着クラッド法
等により製造される。Conventionally, two-layer clad steel pipes using, for example, carbon steel as the base material and stainless steel as the inner layer material are manufactured by, for example, the cast cladding method, the built-up cladding method, the explosion bonding cladding method, and the like.
鋳込みクラッド法にあっては、ピアサ−によって１孔す
る際、内層材が薄いと内面に母材が露出するので、内層
材を厚くする必要があり、コスト高となる欠点がある。In the cast clad method, when one hole is made with a piercer, if the inner layer material is thin, the base material will be exposed on the inner surface, so the inner layer material needs to be thicker, which has the disadvantage of increasing costs.
また肉盛りクラッド法にあっては、母材への溶着金属の
厚さが数龍となってしまうため、使用する内層材が多く
なりコスト高となる欠点がある。Furthermore, in the build-up cladding method, the thickness of the welded metal to the base material is several times the thickness, so there is a drawback that more inner layer materials are used, resulting in higher costs.
さらに爆着クラッド法にあっては、母材と内層材間に部
分的な剥離が生じる欠点がある。Furthermore, the explosive bonding cladding method has the disadvantage that partial peeling occurs between the base material and the inner layer material.
本発明は、かかる従来の問題点に鑑み開発されたもので
あって、その実施の一例を図面、に基づき以下に説明す
る。The present invention was developed in view of such conventional problems, and an example of its implementation will be described below based on the drawings.
第１図、第２図において、１け、母材としての例えば炭
素鋼あるいは低合金鋼からなる継目無鋼管であり、この
鋼管１の内面を、スチールグリッドあるいはアルミナグ
リッド等を用いてプラストし、ブラスト後、鋼管１の内
面全体に、内層材としての伝えばステンレス鋼、クロー
ム、クローム合金、ニッケル、ニッケル合金、チタン、
チタン合金、銅、銅合金等、目的に応じた金属を溶射し
、溶射金属皮膜が形成された鋼管１を熱処理炉にて拡散
熱処理し、溶射金属皮膜の拡散層２を形成させる。1 and 2, the base material is a seamless steel pipe made of carbon steel or low alloy steel, for example, and the inner surface of the steel pipe 1 is plastered with steel grid or alumina grid, After blasting, the entire inner surface of the steel pipe 1 is coated with inner layer materials such as stainless steel, chrome, chrome alloy, nickel, nickel alloy, titanium,
A metal such as titanium alloy, copper, copper alloy, etc. according to the purpose is sprayed, and the steel pipe 1 on which the sprayed metal coating is formed is subjected to diffusion heat treatment in a heat treatment furnace to form a diffusion layer 2 of the sprayed metal coating.
拡散熱処理を行う目的は、第１に、溶射形成された金属
皮膜の鋼管１に対する接着強度が小さいので、拡散熱処
理によって、溶射金属皮膜と鋼管１とを冶金的に結合さ
せ、接着強度を大きくするためである。The purpose of the diffusion heat treatment is, firstly, since the adhesive strength of the sprayed metal coating to the steel pipe 1 is low, the diffusion heat treatment is used to metallurgically bond the sprayed metal coating and the steel pipe 1 to increase the adhesive strength. It's for a reason.
第２に、溶射形成された金属皮膜には気孔が介在してい
るので、拡散熱処理によって金属皮膜の自己拡散が促進
され、気孔は消滅あるいは球状の小塊と化し、気冨性が
確保されるためである。Second, since there are pores in the thermally sprayed metal film, self-diffusion of the metal film is promoted by diffusion heat treatment, and the pores disappear or become spherical particles, ensuring air permeability. It's for a reason.
なお、拡散熱処理条件は、第３図に示す如く、金属皮膜
の拡散層厚が、温度と時間の影響を受けるものであり、
温度は１１００ ’０以上が処理時間も短くて経爵的で
ある。The diffusion heat treatment conditions are such that the thickness of the diffusion layer of the metal film is affected by temperature and time, as shown in Figure 3.
A temperature of 1100'0 or above is preferable since the processing time is short.
捷だ前記鋼管１の内面のブラスト後、金属溶射までの時
間が長いと、プラスト面の酸化が進行するので、長くて
も４時間以内に金属溶射全行うのが望ましい。If the time period between blasting the inner surface of the spun steel pipe 1 and metal spraying is long, oxidation of the blast surface will progress, so it is desirable to complete the metal spraying within 4 hours at the most.
実験例
母材として低炭素鋼継目無鋼管を用い、その内面を、ス
チールグリッド１００番を用いてプラストシ、ブラスト
後、４時間μ内に、ハステロイＣｔ ０．５ ｍｍ厚に
鋼管内面全体に溶射して、ハステロイＣの皮膜を形成し
、この皮膜が形成された中管を、熱処理炉にて１３００
′０，２時間、拡散熱処理し、５０μ厚の拡散層を得た
。Experimental example A seamless low carbon steel pipe was used as the base material, and after blasting and blasting, the entire inner surface of the pipe was thermally sprayed with Hastelloy Ct to a thickness of 0.5 mm within 4 hours. Then, a Hastelloy C film was formed, and the inner tube with this film formed was heated in a heat treatment furnace for 1300 min.
A diffusion heat treatment was performed for 0.2 hours to obtain a diffusion layer with a thickness of 50 μm.
第４図は上記溶射金属皮膜の拡散層断面を研磨した後、
ナイタールエッチした拡散層組織の４００倍顕微鏡写真
であるが、溶射金属皮膜特有の気孔も球状に小さくなっ
ており、鋼管の内面は完全に被覆されている。Figure 4 shows the cross section of the diffusion layer of the sprayed metal coating after polishing.
A 400x micrograph of the nital-etched diffusion layer structure shows that the pores characteristic of the sprayed metal coating have become small and spherical, and the inner surface of the steel pipe is completely covered.
なお、母材としての鋼管が小径サイズであって、その内
面に金属を溶射することが困難な場合は、上述の如くし
て製造された比較的大径サイズの複層鋼管を、ストレッ
チレテユーサーにより熱間絞９加工すれば、所望の小径
サイズの複層鋼管を得ることができる。If the steel pipe used as the base material has a small diameter and it is difficult to thermally spray metal on its inner surface, the relatively large diameter multilayer steel pipe manufactured as described above can be used with a stretch retewator. By performing hot drawing 9, a multilayer steel pipe with a desired small diameter size can be obtained.
本発明は上述の如く、鋼管の内面を脱スケール後、この
鋼管の内面に、内層を形成すべき金属を溶射し、金属溶
射した鋼管全拡散熱処理して複層鋼管を製造するので、
金属内層厚を薄くできると共に、整粒化された金属内層
を、母材である鋼管の内面に冶金的に結合させ、接着強
度を大きくすることができ、従って品質の良好な複層鋼
管を比較的容易かつ安価に製造できる。As described above, in the present invention, after descaling the inner surface of a steel pipe, a metal to form an inner layer is sprayed onto the inner surface of the steel pipe, and the metal sprayed steel pipe is subjected to full diffusion heat treatment to produce a multilayer steel pipe.
In addition to being able to reduce the thickness of the metal inner layer, the grained metal inner layer can be metallurgically bonded to the inner surface of the base material steel pipe, increasing adhesive strength. Therefore, comparing multilayer steel pipes with good quality. It can be manufactured easily and inexpensively.
第１図は本発明方法により製造された複層鋼管の一部切
欠き正面図、第２図は、第１図Ａ−Ａ線における断面図
、第３図は拡散熱処理条件と溶射金属皮膜の拡散層厚と
の関係を示すグラフ、第４図は拡散層組織の４００倍顕
微鏡写真である。
第１図 第２図
第３図
熱刈埋時間（Ｈ）Fig. 1 is a partially cutaway front view of a multilayer steel pipe manufactured by the method of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 shows diffusion heat treatment conditions and sprayed metal coating. FIG. 4, a graph showing the relationship with the diffusion layer thickness, is a 400x microscopic photograph of the structure of the diffusion layer. Figure 1 Figure 2 Figure 3 Thermal cutting time (H)
Claims (1)
形成すべき金属を溶射し、金属溶射した鋼管を拡散熱処
理することを特徴とする複層鋼管の製造方法。A method for producing a multi-layer steel pipe, which comprises: descaling the inner surface of the steel pipe; then thermally spraying a metal to form an inner layer onto the inner surface of the steel pipe; and subjecting the metal-sprayed steel pipe to diffusion heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11226882A JPS591669A (en) | 1982-06-28 | 1982-06-28 | Manufacture of double-layered steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11226882A JPS591669A (en) | 1982-06-28 | 1982-06-28 | Manufacture of double-layered steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS591669A true JPS591669A (en) | 1984-01-07 |
Family
ID=14582446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11226882A Pending JPS591669A (en) | 1982-06-28 | 1982-06-28 | Manufacture of double-layered steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS591669A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6749894B2 (en) * | 2002-06-28 | 2004-06-15 | Surface Engineered Products Corporation | Corrosion-resistant coatings for steel tubes |
| JP2017008379A (en) * | 2015-06-23 | 2017-01-12 | 日本発條株式会社 | Clad pipe, and production method of clad pipe |
-
1982
- 1982-06-28 JP JP11226882A patent/JPS591669A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6749894B2 (en) * | 2002-06-28 | 2004-06-15 | Surface Engineered Products Corporation | Corrosion-resistant coatings for steel tubes |
| JP2017008379A (en) * | 2015-06-23 | 2017-01-12 | 日本発條株式会社 | Clad pipe, and production method of clad pipe |
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