JPH03104634A - Production of steel pipe having outer face coated with plastic - Google Patents
Production of steel pipe having outer face coated with plasticInfo
- Publication number
- JPH03104634A JPH03104634A JP24259489A JP24259489A JPH03104634A JP H03104634 A JPH03104634 A JP H03104634A JP 24259489 A JP24259489 A JP 24259489A JP 24259489 A JP24259489 A JP 24259489A JP H03104634 A JPH03104634 A JP H03104634A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- layer
- coated
- galvanized
- plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 239000004033 plastic Substances 0.000 title claims abstract description 21
- 229920003023 plastic Polymers 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 238000005246 galvanizing Methods 0.000 claims abstract description 11
- 230000003746 surface roughness Effects 0.000 claims abstract description 9
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims abstract description 7
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000005422 blasting Methods 0.000 claims abstract description 6
- 229920005672 polyolefin resin Polymers 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 12
- 229920005989 resin Polymers 0.000 abstract description 7
- 239000011347 resin Substances 0.000 abstract description 7
- 229920001187 thermosetting polymer Polymers 0.000 abstract description 6
- 239000003822 epoxy resin Substances 0.000 abstract description 4
- 229920000647 polyepoxide Polymers 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 4
- 238000000576 coating method Methods 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 10
- 229920000098 polyolefin Polymers 0.000 description 9
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- -1 Polyethylene Polymers 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 150000008064 anhydrides Chemical class 0.000 description 2
- 235000013405 beer Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 235000014653 Carica parviflora Nutrition 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241000243321 Cnidaria Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 101150016402 fsn-1 gene Proteins 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野］
この発明は、プラス千ンク外面被ＦＷ鋼管の製造方法に
関する．
［従来技術］
鋼管外面の耐食性を高めた従来のプラスチック外面被Ｆ
Ｈｔｌ管トしテハ、Ｆ？公昭５６−４３０３１号記載の
ものがある．これは第３図のように鋼管２１の外面に熱
硬化性樹脂を塗布してブライマー層２２を形成し、この
ブライマー層２２の表面を変性ポリオレフィン樹脂の融
点以下の温度に加熱した後、このブライマー層２２の外
面に変性ポリオレフィン樹脂層２３を被覆融着し、次い
でその外面にポリオレフィン樹脂外被２４を重ねて被覆
するという方法で製造されるものである．従来のプラス
チック外面被覆鋼管は、上記したような方法で製造され
るので、もっぱら鋼管の外面の耐食性のみを重視し、内
面の耐食性はあまり重視しないような用途、例えば管内
に水を通さない用途、に使用されていた．しかしながら
、消火管等管内に水を通す用途の場合には、管内面の耐
食性も必要となり、このような用途の場合には鋼管の内
面を亜鉛メッキする必要がある．［発明が解決しようと
する課題］
しかしながら，鋼管の亜鉛メッキは、通常どぶ漬けとい
われる亜鉛メッキ槽に鋼管全体を浸漬する方法が採用さ
れているので、鋼管は内外面とも亜鉛メッキされてしま
う．そして外面の亜鉛メッキ槽の上に上記したようにポ
リオレフィンを被覆して、プラスチック外面被覆鋼管を
製造しようとしても，亜鉛メッキ層とポリオレフィン被
覆との間の接着性が悪く、第１表に示すように短時日で
接着性が低下するという問題がある．すなわち、第１表
はＪＩＳ ０ ３４６９（ポリエチレン被覆鋼管〉
に規定する被覆の接着強度を測定するビール強度試験の
結果であるが、ポリオレフィン被覆の１備輻当たりの引
き剥がし強度が、鋼管にポリオレフィン被覆したものは
、被覆当初２３ｋｇ／ｃｍから、工５日後も２ ２ ｋ
ｇ ／ ｅｘとほとんど変化していないのに対し、亜鉛
メッキ鋼管にポリオレフィン被覆したものは、被覆当初
１５ｋｇ／ｃｍから、１５日後にはＯ〜３ ｋｇ ／
ｃｓ ）と極端に低下するという問題があり、鋼管外面
の耐食性を高めることができなかった。[Detailed Description of the Invention] "Industrial Field of Application" The present invention relates to a method for manufacturing a plastic externally coated FW steel pipe. [Prior Art] A conventional plastic outer coated F steel pipe with improved corrosion resistance on the outer surface of a steel pipe.
Htl tube toteha, F? There is one described in Publication No. 56-43031. As shown in Fig. 3, a thermosetting resin is applied to the outer surface of a steel pipe 21 to form a brimer layer 22, and the surface of this brimer layer 22 is heated to a temperature below the melting point of the modified polyolefin resin. It is manufactured by coating and fusing a modified polyolefin resin layer 23 on the outer surface of the layer 22, and then overlaying and covering the outer surface with a polyolefin resin jacket 24. Conventional plastic externally coated steel pipes are manufactured using the method described above, so they are suitable for applications where the corrosion resistance of the outside surface of the steel pipe is emphasized and the corrosion resistance of the inside surface is not so important, such as applications where water does not pass through the pipe, It was used in However, in applications where water is passed through pipes such as fire extinguishing pipes, the inner surface of the pipe must have corrosion resistance, and in such applications, the inner surface of the steel pipe must be galvanized. [Problem to be solved by the invention] However, since galvanizing of steel pipes is usually done by immersing the entire steel pipe in a galvanizing bath called dobuzuke, both the inner and outer surfaces of the steel pipe are galvanized. Even if an attempt was made to manufacture a plastic exterior-coated steel pipe by coating the exterior galvanized tank with polyolefin as described above, the adhesion between the galvanized layer and the polyolefin coating was poor, as shown in Table 1. However, there is a problem in that adhesiveness deteriorates over a short period of time. In other words, Table 1 is based on JIS 0 3469 (Polyethylene coated steel pipes)
The results of the Beer strength test, which measures the adhesive strength of coatings specified in 2013, show that the peel strength per piece of polyolefin coating for steel pipes coated with polyolefin ranged from 23 kg/cm at the time of coating to 5 days after installation. 2 2k
g/ex, while there is almost no change in galvanized steel pipe coated with polyolefin, from 15 kg/cm at the beginning of coating to O~3 kg/cm after 15 days.
cs), and the corrosion resistance of the outer surface of the steel pipe could not be improved.
この発明は、従来技術の上述のような問題点を解消し、
内面亜鉛メッキのプラスチック外面被覆鋼管を提供する
ことを目的としている．第 １ 表
［課題を解決するための手段］
この発明に係るプラスチック外面被覆鋼管の製造方法は
、鋼管の内外面を亜鉛メッキした後、外面の亜鉛メッキ
層をショットプラスｌ− Ｌて剥離し、表面粗さをＲｚ
で２０〜１ ０ ０ ）ｔ ｍにした後、この上にクロ
ム酸を（ｆｉｌ１、、さらにこの上にブライマーを塗布
してブライマー簿を形成し、その表面を変性ポリオレフ
ィン樹脂の融点以上の温度に加熱した後、このプライマ
ー層の外面に変性ポリオレフィン樹脂層を被覆融着し、
次いでその外面にポリオレフィン樹脂外被を重ねて被覆
するプラスチック外面被覆鋼管の製造方法である．［作
用］
この発明に係るプラスチック外面被覆鋼管の製造方法は
、鋼管の内外面を亜鉛メッキした後、外面の亜鉛メッキ
層をショットブラストして剥離し、表面粗さをＲｚで２
０〜１００μｍにした後、この上にクロム酸を塗布し、
さらにこの上にブライマーを塗布してプライマー層を形
威し、その表面を変性ポリオレフィン樹脂の融点以上の
温度に加熱した後、このプライマー層の外面に変性ポリ
オレフィン樹脂層を被覆融着し、次いでその外面にポリ
オレフィン樹脂外被を重ねて被覆するようにしている．
鋼管を亜鉛メッキしたのは、プラスチック外面被Ｆｆｆ
！４管内面の耐食性を向上させようとするものであるが
、鋼管の亜鉛メッキ方法としては鋼管全体を亜鉛メッキ
槽に浸漬するいわゆるとぶ漬けによる方法しかないので
，必然的に鋼管の内外面に亜鉛メッキ層が生成される．
鋼管内面の亜鉛メッキ層は鋼管内面の耐食性を向上させ
るのに有効であるが、鋼管外面の亜鉛メッキ層はその上
に被覆するプライマー層との密着性が悪く耐食性低下の
原因となる．以上のような理由で鋼管外面の亜鉛メッキ
層を剥離してやるのであるが、表面粗さ＆Ｒｚで１００
μｍ以下にしなければブライマー層との密着性がよくな
らず、Ｒｚで２０μｍにするには経済的な面で不利益で
ある。This invention solves the above-mentioned problems of the prior art,
The purpose of this project is to provide steel pipes coated with plastic on the outside and galvanized on the inside. Table 1 [Means for Solving the Problems] The method for manufacturing a plastic outer coated steel pipe according to the present invention includes galvanizing the inner and outer surfaces of the steel pipe, and then peeling off the galvanized layer on the outer surface using shot plus L-L. Surface roughness Rz
After adjusting the temperature to 20 to 100) tm, chromic acid (fil1) is applied on top of this, and then a brimer is applied on top of this to form a brimer sheet, and the surface is heated to a temperature higher than the melting point of the modified polyolefin resin. After heating, a modified polyolefin resin layer is coated and fused on the outer surface of this primer layer,
This is a method for producing steel pipes with a plastic outer coating, in which the outer surface of the tube is then coated with a polyolefin resin outer jacket. [Function] The method for producing a plastic externally coated steel pipe according to the present invention includes galvanizing the inner and outer surfaces of the steel pipe, then peeling off the galvanized layer on the outer surface by shot blasting, and reducing the surface roughness to 2 in Rz.
After making it 0 to 100 μm, apply chromic acid on top of it,
Further, a primer layer is applied on top of this to form a primer layer, the surface of which is heated to a temperature higher than the melting point of the modified polyolefin resin, and then a modified polyolefin resin layer is coated and fused on the outer surface of this primer layer. The outer surface is coated with a polyolefin resin jacket.
Galvanized steel pipe is covered with plastic outer surface Fff
! 4 This is an attempt to improve the corrosion resistance of the inner surface of the pipe, but since the only method for galvanizing steel pipes is immersing the entire steel pipe in a galvanizing bath, it is necessary to apply zinc to the inner and outer surfaces of the steel pipe. A plating layer is generated.
The galvanized layer on the inner surface of a steel pipe is effective in improving the corrosion resistance of the inner surface of the steel pipe, but the galvanized layer on the outer surface of the steel pipe has poor adhesion with the primer layer that coats it, causing a decrease in corrosion resistance. For the above reasons, the galvanized layer on the outer surface of the steel pipe is peeled off, but the surface roughness & Rz is 100%.
Unless the thickness is less than .mu.m, the adhesion with the brimer layer will not be good, and it is economically disadvantageous to set the Rz to 20 .mu.m.
したがって、剥離する程度をＲｚで２０〜１００μｍと
したのである．このようにして、ｆａ管外而にプライマ
一層、変性ポリオレフィン魔およびポリオレフィン層を
この順に形成するのであるが、これらの方法については
従来のプラスチック外面被覆鋼管の製造方法とは変わっ
ていない．したがって、内面の耐食性が良好であるとと
もに、外面の被覆の接着性が良好なプラスチック外面被
覆ｆｌ４管を得ることができる．
（実施例］
本発明の１実施例のプラスチック外面被覆鋼管の製造方
法を第１図および第２図により説明する６本発明の１実
施ρｊのプラスチック外面披ＷＩ鋼管の製造方法は、第
１図のように鋼管１を亜鉛メッキ糟に浸漬して鋼管１の
内外面に亜紹メッキｊｆｌ ２ ａおよび２ｂを生戒さ
せた後、シヨ・ν１−ブラスト装評により、第２図のよ
うに外面の亜鉛メッキ珊２１〕を表面粗さがＲｚで２０
〜１００μｍになるまで剥離してやる．そして、この表
而にクロム酸を塗布してクｌフメート層３を形成し密着
性を向」二させた後、ブライマー層４を設ける。このプ
ライマー屑４は、例えばエボキシ樹脂等の熱硬化性樹脂
の塗布により形成され、好ましくは性エボキシ樹脂など
の比較的低温で速硬化型の熱硬化樹脂を塗布する．そし
てその塗布方法は次のとおりである．すなわち、表面を
清浄に処理された鋼管が熱硬化樹脂の貯められｆＳＮ１
の中を通る。そして、槽の出口においてリング状のゴム
、ブラシ等で鋼管】の外表面に付着した樹脂がしごき落
とされる．こうして鋼管１の外表面に１０〜６０μｍの
厚さの皮膜が形成される．
上記ブライマー層４の外面に変性ボリオレフィン樹脂を
ＴｊｌＭする６変性ポリオレフィン樹脂とは、不飽和カ
ルボン酸またはその無水物で変性したポリオレフィン樹
詣をいうのであるが、ポリオレフィン樹脂にに不飽和カ
ルボン酸またはその無水物をグラウ＋− Ｌたちのと未
変性ポリオレフィン樹脂をブレンドしたもの等が含まれ
る．そしてベースとなるポリオレフィン樹脂としては具
体的には低密度ポリエチレン、中密度ポリエチレン、高
密度ポリエチレン、ボリブロビレン、ボリｌ−ブテン、
ポリ−４−メチル−１−ベンテン、エチレンープロピレ
ン共重合体、エチレンー１ブテン共重合体、プ口ビレン
ー１−ブテン共重合体、およびこれらの混合物等があげ
られる．さらには、この変性ポリオレフィン樹脂層５の
外面にポリオレフィン樹脂外被を重ねて押出被覆し、ポ
リオレフィン樹脂層６を形成する．このようにして製造
したプラスチック外面被覆鋼管のプラスチック樹脂の接
着性について、ビール強度試験を実施下結果を第２表に
示す．この試験に使用した試験材は１５０ＡＸ５．５ｍ
のｔＡ管を亜鉛メッキした後、外面の亜鉛メッキを表面
粗さがＲｚで２０〜１００μｍになるよでショットブラ
ストで除去し、その上にクロム酸をクロム量で０．１．
ｇ／ｍ”塗布し、その上にブライマー、変性ポリオレフ
ィン樹脂およびポリオレフィン樹脂の各層をこの順に形
威したものである．第２表
第２表から分かるように過酷な条件下においても密着力
の低下は認められない。Therefore, the degree of peeling was set at Rz of 20 to 100 μm. In this way, a primer layer, a modified polyolefin layer, and a polyolefin layer are formed in this order on the outside of the fa tube, and these methods are the same as the conventional manufacturing method for plastic outer-coated steel pipes. Therefore, it is possible to obtain a plastic outer-coated fl4 tube whose inner surface has good corrosion resistance and whose outer surface coating has good adhesion. (Example) A method for manufacturing a steel pipe with a plastic outer surface coating according to an embodiment of the present invention will be explained with reference to FIGS. After immersing the steel pipe 1 in a galvanizing solution to coat the inner and outer surfaces of the steel pipe 1 with submersible plating jfl 2 a and 2 b, the outer surface is coated by a sho-v1-blasting process as shown in Fig. 2. galvanized coral 21] with a surface roughness of 20 in Rz.
Peel it until it reaches ~100 μm. Then, after coating this surface with chromic acid to form a chromate layer 3 to improve adhesion, a brimer layer 4 is provided. The primer waste 4 is formed by applying a thermosetting resin such as epoxy resin, preferably a thermosetting resin that hardens quickly at a relatively low temperature such as epoxy resin. The application method is as follows. In other words, a steel pipe whose surface has been cleaned is filled with thermosetting resin, fSN1
pass through. Then, at the outlet of the tank, the resin adhering to the outer surface of the steel pipe is scrubbed off using a ring-shaped rubber, brush, etc. In this way, a film with a thickness of 10 to 60 μm is formed on the outer surface of the steel pipe 1. The modified polyolefin resin in which a modified polyolefin resin is added to the outer surface of the brimer layer 4 refers to a polyolefin resin modified with an unsaturated carboxylic acid or its anhydride. This includes blends of the anhydride with unmodified polyolefin resins. Specific examples of the base polyolefin resin include low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, polyl-butene,
Examples include poly-4-methyl-1-bentene, ethylene-propylene copolymer, ethylene-1-butene copolymer, birene-1-butene copolymer, and mixtures thereof. Furthermore, a polyolefin resin jacket is overlaid and extrusion coated on the outer surface of this modified polyolefin resin layer 5 to form a polyolefin resin layer 6. A beer strength test was conducted to determine the adhesion of the plastic outer surface coated steel pipe manufactured in this manner to the plastic resin. The results are shown in Table 2. The test material used for this test is 150AX5.5m
After galvanizing the tA tube, the outer zinc plating was removed by shot blasting to a surface roughness of 20 to 100 μm in Rz, and chromic acid was applied on top of it to a chromium content of 0.1.
g/m", and each layer of brimer, modified polyolefin resin, and polyolefin resin was applied in this order on top of it. As can be seen from Table 2, the adhesion strength did not decrease even under harsh conditions. It is not allowed.
本発明の実１ｉ１ＰＡのプラスチック外而被覆鋼管の製
造方法においては、プラスチック外面披ＦＷ鋼管が上記
したようにして製造されるので、鋼管内面の耐食性が良
好で、鋼管外面のプラス千ンク樹脂の接着性もよいプラ
ス千ンク外面被覆鋼管を得ることができる．
［発明の効果］
この発明により、内外面とも耐食性の良好なブラスチッ
ク外面被覆鋼管を得ることができる６In the method for manufacturing a plastic externally coated steel pipe according to the present invention, since the plastic externally coated FW steel pipe is manufactured as described above, the corrosion resistance of the internal surface of the steel pipe is good, and the adhesiveness of the plastic externally coated steel pipe on the external surface of the steel pipe is good. It is possible to obtain a plus-thousand coated steel pipe with good properties. [Effects of the Invention] According to the present invention, it is possible to obtain a plastic outer coated steel pipe with good corrosion resistance on both the inner and outer surfaces6.
【図面の簡単な説明】
第１図は本発明の１実施例のプラスチック外面被覆鋼管
を製造する過程で製造した亜鉛メッキ鋼管の断面図、第
２図は本発明の１実施例の製造プＪ法で製造したプラス
チック外面被覆鋼管の断面図、第３図は従来のプラスチ
ック外面被覆鋼管の断面図である．
１・・・鋼管，２ａ，２ｂ・・亜鉛メッキ層、３ ・ク
ロメート層、４・・・プライマー層、５ ・変性ポリオ
レフィン層、
６ ボリオレフィン層．[Brief Description of the Drawings] Fig. 1 is a sectional view of a galvanized steel pipe manufactured in the process of manufacturing a plastic externally coated steel pipe according to an embodiment of the present invention, and Fig. 2 is a sectional view of a manufacturing process according to an embodiment of the present invention. Fig. 3 is a cross-sectional view of a conventional plastic-exterior-coated steel pipe. DESCRIPTION OF SYMBOLS 1... Steel pipe, 2a, 2b... Galvanized layer, 3 - Chromate layer, 4... Primer layer, 5 - Modified polyolefin layer, 6 Polyolefin layer.
Claims (1)
層をショットブラストして剥離し、表面粗さをＲｚで２
０〜１００μｍにした後、この上にクロム酸を塗布し、
さらにこの上にプライマーを塗布してプライマー層を形
成し、その表面を変性ポリオレフィン樹脂の融点以上の
温度に加熱した後、このプライマー層の外面に変性ポリ
オレフィン樹脂層を被覆融着し、次いでその外面にポリ
オレフィン樹脂外被を重ねて被覆することを特徴とする
プラスチック外面被覆鋼管の製造方法。After galvanizing the inner and outer surfaces of the steel pipe, the outer galvanized layer is peeled off by shot blasting, and the surface roughness is reduced to Rz 2.
After making it 0 to 100 μm, apply chromic acid on top of it,
Further, a primer is applied on top of this to form a primer layer, the surface of which is heated to a temperature higher than the melting point of the modified polyolefin resin, a modified polyolefin resin layer is coated and fused on the outer surface of this primer layer, and then the outer surface of the primer layer is coated and fused. 1. A method for manufacturing a plastic outer-coated steel pipe, which comprises overlaying a polyolefin resin outer sheath on a steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1242594A JP2893749B2 (en) | 1989-09-19 | 1989-09-19 | Method of manufacturing plastic outer coated steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1242594A JP2893749B2 (en) | 1989-09-19 | 1989-09-19 | Method of manufacturing plastic outer coated steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03104634A true JPH03104634A (en) | 1991-05-01 |
| JP2893749B2 JP2893749B2 (en) | 1999-05-24 |
Family
ID=17091372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1242594A Expired - Lifetime JP2893749B2 (en) | 1989-09-19 | 1989-09-19 | Method of manufacturing plastic outer coated steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2893749B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06340027A (en) * | 1993-06-01 | 1994-12-13 | Sumitomo Metal Ind Ltd | Polyolefin resin-coated steel pipe |
| JPH10211671A (en) * | 1997-01-31 | 1998-08-11 | Nippon Steel Corp | Corrosion-proof method of shield segment for underground river tunnel |
| KR100587569B1 (en) * | 2005-11-15 | 2006-06-08 | (주)유성티엔에스 | Steel pipe painting system |
| WO2010008025A1 (en) * | 2008-07-16 | 2010-01-21 | 新日本製鐵株式会社 | Process for production of steel tube having polyolefin-coated inside surface |
| JP2016032874A (en) * | 2014-07-31 | 2016-03-10 | Ｊｆｅスチール株式会社 | Polyethylene-coated steel tube and production method thereof |
-
1989
- 1989-09-19 JP JP1242594A patent/JP2893749B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06340027A (en) * | 1993-06-01 | 1994-12-13 | Sumitomo Metal Ind Ltd | Polyolefin resin-coated steel pipe |
| JPH10211671A (en) * | 1997-01-31 | 1998-08-11 | Nippon Steel Corp | Corrosion-proof method of shield segment for underground river tunnel |
| KR100587569B1 (en) * | 2005-11-15 | 2006-06-08 | (주)유성티엔에스 | Steel pipe painting system |
| WO2010008025A1 (en) * | 2008-07-16 | 2010-01-21 | 新日本製鐵株式会社 | Process for production of steel tube having polyolefin-coated inside surface |
| JP2010023142A (en) * | 2008-07-16 | 2010-02-04 | Nippon Steel Corp | Method for manufacturing internally polyolefin coated steel pipe |
| JP4691141B2 (en) * | 2008-07-16 | 2011-06-01 | 新日本製鐵株式会社 | Manufacturing method of inner surface polyolefin coated steel pipe |
| CN102089120A (en) * | 2008-07-16 | 2011-06-08 | 新日本制铁株式会社 | Process for production of steel tube having polyolefin-coated inside surface |
| KR101279334B1 (en) * | 2008-07-16 | 2013-06-26 | 신닛테츠스미킨 카부시키카이샤 | Process for production of steel tube having polyolefin-coated inside surface |
| JP2016032874A (en) * | 2014-07-31 | 2016-03-10 | Ｊｆｅスチール株式会社 | Polyethylene-coated steel tube and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2893749B2 (en) | 1999-05-24 |
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