JPS58222837A - Manufacture of abrasion-resisting bent pipe - Google Patents
Manufacture of abrasion-resisting bent pipeInfo
- Publication number
- JPS58222837A JPS58222837A JP57107042A JP10704282A JPS58222837A JP S58222837 A JPS58222837 A JP S58222837A JP 57107042 A JP57107042 A JP 57107042A JP 10704282 A JP10704282 A JP 10704282A JP S58222837 A JPS58222837 A JP S58222837A
- Authority
- JP
- Japan
- Prior art keywords
- wear
- bent pipe
- pipe
- resistant
- metal
- 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
Landscapes
- Laminated Bodies (AREA)
- Moulding By Coating Moulds (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
この発明は主として、中径管以下の曲管部の耐摩耗性を
向上する方法および曲管部のｉｌｔＦＪ耗性補修方性補
修方法。DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a method for improving the wear resistance of a curved pipe section of a medium-diameter pipe or smaller, and a method for repairing iltFJ wear of a curved pipe section.
近年、石炭等のスラリー輸送が注目ちれている。In recent years, the transportation of slurry such as coal has been attracting attention.
スラリー輸送は粉体を液体に混じ、パイフ゛ラインを利
用して輸送するものであるが、直管部分に較べ、曲管部
分の摩耗が著るしく、対策が要望系れている。Slurry transportation involves mixing powder with liquid and transporting it using pipe lines, but the curved pipes are more prone to wear than the straight pipes, and countermeasures are required.
すなわち、摩耗位置はベンド管の外周内面が特に顕著で
あって、輸送する研摩性媒体の種類、流体や流速により
異なるが、一度ベンド管の外周内面に摩耗溝がつくと、
その部分を集中的に摩耗δせ研摩性媒体の通９道となり
、終に穿孔ちれるに至る。In other words, the wear position is particularly noticeable on the inner surface of the outer periphery of the bent pipe, and it varies depending on the type of abrasive medium being transported, the fluid, and the flow rate, but once abrasion grooves are formed on the inner surface of the outer periphery of the bent pipe,
That part is intensively abraded and becomes a path for the abrasive medium, eventually leading to perforation.
この局部摩耗は非常に不経済であり、従ってその対策と
して例えばベンド管を高クロム、耐摩耗性鋳鉄等で鋳造
し、しかも外周の肉厚を内周よシも厚くする等が行われ
ているが、コヌトが割高となシ、またこの種の材質は溶
接割れが発生し易く、部分摩耗して孔ができても溶接肉
盛りで補修できず、結局新品と交換しなければならない
欠点がらる。従って本発明の目的は、比較的安価に耐摩
耗性の大きいベンド管を製造する方法ならびに耐摩耗性
の大なるベンド管の補修方法を提供するにらる。This localized wear is very uneconomical, so as a countermeasure, for example, the bent pipe is cast with high chromium, wear-resistant cast iron, etc., and the wall thickness on the outer periphery is thicker than that on the inner periphery. However, Conuto is relatively expensive, and this kind of material is prone to weld cracks, and even if a hole forms due to partial wear, it cannot be repaired with weld overlay, and it has to be replaced with a new one. . Therefore, an object of the present invention is to provide a method for manufacturing a bent pipe with high wear resistance at a relatively low cost, and a method for repairing a bent pipe with high wear resistance.
本発明は、溶接可能な鉄または鋼を素材とするベンド管
をつくシ、その少なくとも彎曲部の外周の外側に耐摩耗
性金属を溶接、鋳かけ等で肉盛シした後、該部分を蔽う
ようにベンド管周囲に強化プラスチックの被覆層を形成
することを特徴とし、本来ベンド管に耐摩耗性金属の盛
金を施す場合、研摩性媒体が直接衝突する面、すなわち
彎曲部外周内面に施すのが常識であるが、本発明の特徴
は、彎曲部外周外面に耐摩耗性金属の盛金を施すように
し、さらに該部分を蔽うように、ベンド管周囲に強化プ
ラヌチックの被覆層を形成し、１ｉｔｌ耗性金属性金属
離しないようにする点にある。The present invention involves making a bent pipe made of weldable iron or steel, overlaying a wear-resistant metal on the outside of at least the outer periphery of the curved part by welding, casting, etc., and then covering the part. It is characterized by forming a reinforced plastic coating layer around the bend pipe, and when applying wear-resistant metal overlay to the bend pipe, it is usually applied on the surface directly hit by the abrasive medium, that is, on the inner surface of the outer periphery of the curved part. Although this is common knowledge, the feature of the present invention is that a wear-resistant metal overlay is applied to the outer surface of the curved part, and a reinforced planutic coating layer is formed around the bent pipe to cover this part. , the point is to prevent the wear and tear of metal from being released.
大径のベンド管の場合は外周部内面に耐摩耗性金属を盛
金することが容易であるが、例えば直径３０１以下の中
小径ベンド管の場合は内面肉盛りが不可能である。そこ
でベンド管ヲ縦割シにして外周部内面の盛金を施して後
、再び合せて溶接接合してベンド管に復元するのである
が、この方法は硬化盛金を施すことにょ夛大きい友形が
生じ・元の形状に復元するのに非常な加工手間を要する
。In the case of a large-diameter bent pipe, it is easy to overlay the inner surface of the outer circumference with a wear-resistant metal, but in the case of a small-medium diameter bent pipe with a diameter of 301 mm or less, for example, it is impossible to overlay the inner surface. Therefore, the bent pipe is split vertically and the inner surface of the outer periphery is covered with metal, and then they are put together and welded again to restore the bent pipe. occurs and requires a great deal of processing effort to restore to its original shape.
しかるに、本発明の方法の採用により、このような間鵜
を一挙に解消できるのである。However, by adopting the method of the present invention, such problems can be eliminated at once.
以下、本発明をきらに詳細に説明する。Hereinafter, the present invention will be explained in detail.
ベンド管素材（１）には易溶接性の鋳鉄、鋳鋼、普通鋼
等を用いる。ベンド管の少なくとも彎曲部の外周の外側
、すなわち研摩性媒体が最も強く衝突する部分の外側、
第１図（２）の部分に銅犀耗性硬化 ）金属（３
）を溶接法あるいは鋳かけ法等で盛金する（第２図）。For the bend pipe material (1), easily weldable cast iron, cast steel, common steel, etc. are used. At least the outside of the outer periphery of the curved part of the bend pipe, that is, the outside of the part where the abrasive medium collides most strongly,
The part shown in Figure 1 (2) is hardened by copper corrosion (3).
) is deposited using welding or casting methods (Figure 2).
耐摩耗性硬化金属としては、例えばｃ：５〜６％、Ｃｒ
：２２〜８０Ｘを含む高クロム鋼、あるいはこれにＮ’
ｂ、 Ｗ、 Ｍｏ、 Ｖの１種または２種以上を含む高
クロム炭化物系合金等、研摩耗に対しよく抵抗する炭化
物析出型合金で、硬度ＨＲＯ６０程度のものが望ましい
。As the wear-resistant hardened metal, for example, c: 5 to 6%, Cr
: High chromium steel containing 22~80X, or N'
A carbide precipitation type alloy that has good resistance to abrasive wear, such as a high chromium carbide alloy containing one or more of the following: B, W, Mo, and V, and has a hardness of approximately HRO 60 is desirable.
盛金の厚みは１０〜１５ｍｇ程度とすることが可能でア
リ、最終層以外は全面盛金とし、溶接盛金の場合は最終
層は第２図に示す如く、研摩性媒体の流れの方向と直角
方向に、かつ各ビードを重ねて盛金せずにビード（８）
とビード（３〕の間隔を５ｕ以下はどあけて凹凸に盛金
を施すと、その上に被覆する強化プラスチック層（６）
との接合を強くするので好ましい。The thickness of the metal layer can be approximately 10 to 15 mg, and all layers except the final layer are full surface metal layers.In the case of welded metal layers, the final layer is aligned with the flow direction of the abrasive medium as shown in Figure 2. Bead (8) in a right angle direction and without overlapping each bead.
When metal is applied to the irregularities with a gap of 5u or less between the beads (3) and the beads (3), a reinforced plastic layer (6) is formed to cover the uneven surface.
This is preferable because it strengthens the bond with the material.
ｉｓ耗注性硬化金属一般に靭性に欠けており、溶着ビー
ドに割れが発生するので、この金属層自体の耐衝撃性は
極めて低い。そこで水沫では耐摩耗性硬化金属の盛金部
分（３）をＭ９ようにベンド管周囲に強化ブラヌチツク
の被覆層（６）を形成する。Since abrasive hardened metals generally lack toughness and cracks occur in the weld bead, the impact resistance of this metal layer itself is extremely low. Therefore, in the case of water droplets, a coating layer (6) of reinforced blanks is formed around the bend pipe by using a molded metal part (3) made of wear-resistant hardened metal in an M9 shape.
被覆の方法は、例えば耐摩耗性硬化金属の盛金部分を蔽
うようにベンド管周囲にガラヌ繊維、カーボンＲａ、金
属繊維、るるいはナイロン、テフロン等の樹脂繊維等の
繊維（４）を巻トｊけ、１回巻付毎に熱硬化性樹脂（５
）として例えば不飽和ボリエヌテル樹脂、フェノール樹
脂、ビニールエステル系樹脂、あるいはエポキシ樹脂等
を含浸して、これを１１フイとし、ベンド管の肉厚や大
きさに応じてブライ数を決めてベンド管周囲に強化フ゛
フスチツク（ＦＲＰ）の被ＩＮ（６）を形成するのであ
る。The covering method is, for example, by wrapping fibers (4) such as galanu fiber, carbon Ra, metal fiber, resin fiber such as nylon, Teflon, etc. around the bend pipe so as to cover the wear-resistant hardened metal filler part. Thermosetting resin (5
) is impregnated with, for example, unsaturated Borienether resin, phenol resin, vinyl ester resin, or epoxy resin, and this is made into a 11-fiber, and the number of briars is determined according to the wall thickness and size of the bent pipe, and the surrounding area of the bent pipe is An IN (6) of reinforced plastic (FRP) is formed on the surface.
このようにして製造したベンド管は、当初ａＩＭ性媒体
が硬度の低いベンド管素材（１）を容易に摩耗させてし
まうが、素材部分が摩耗しきると耐摩耗性硬化金属の盛
県層（３）が摩耗面に出現する。素材金属との融合がた
ちきられ硬化金属のみとなったこの段階では、もし硬化
金属の外側に強化プラスチックの層（６）が無ければ、
硬化金属は容易に剥離を生ずるようになるが、本発明の
場合、強化プラスチックの層が恰もベンド管外周内側に
強化金属肉盛を施した場合のベンド管素材と同様の効果
を発揮し、強化プラスチック層は研摩性媒体による摩耗
面への衝撃応力を吸収して硬化金属の剥Ｎｔを防止する
。すなわち、強化プラスチックの強度は、鼠鋳鉄Ｊ工Ｓ
Ｆｅ１２．ＦＣ８０程度の強度を有し、例えばガラス
クロス充填ポリニスデル成形品の場合、引張強さ４０．
８ Ｚ ｅ比抗張力（引張強６／比重）２４．０、であ
シ、極めて軽量で、強化フ”ラスチック被覆による重量
増が非常に少ないに拘らず、十分、耐摩耗性硬化金属の
裏当材としての効果を発揮し、また耐摩耗性硬化金属と
の密着強度にも優れている。In the bent pipe manufactured in this way, initially the aIM medium easily wears out the bend pipe material (1) with low hardness, but when the material part is completely worn, the wear-resistant hardened metal layer (3) ) appears on the worn surface. At this stage, when the fusion with the raw metal has stopped and only the hardened metal is left, if there is no reinforced plastic layer (6) on the outside of the hardened metal,
Hardened metal easily peels off, but in the case of the present invention, the reinforced plastic layer exhibits the same effect as the bent pipe material when reinforcing metal overlay is applied to the inner side of the outer periphery of the bent pipe. The plastic layer absorbs impact stress on the worn surface by the abrasive media and prevents flaking of the hardened metal. In other words, the strength of reinforced plastic is
Fe12. It has a strength of about FC80, and for example, a glass cloth-filled polynisdel molded product has a tensile strength of 40.
8 Z eSpecific tensile strength (tensile strength 6/specific gravity) 24.0, extremely lightweight, with very little weight increase due to reinforced plastic coating, sufficient wear-resistant hardened metal backing. It is effective as a material and also has excellent adhesion strength with wear-resistant hardened metals.
本発明のその他の特徴は、ベンド管に摩耗孔を生じた場
合、極めて容易に耐摩耗性の修理ができることである。Another feature of the present invention is that if a wear hole develops in the bent tube, it is extremely easy to perform a wear-resistant repair.
すなわち摩耗孔周辺の強化プラスチック層を除去して摩
耗孔と相似の補修用素材片（可溶接材料）を準備してこ
れを摩耗孔に嵌め込み溶接する。然るのち該溶接ビード
も含めて補修用素材片の外面に耐摩耗性硬化金属を溶接
、鋳かけ等で肉盛シし、この部分を蔽うように、これ迄
の強化プラスチック層に一部うツブさせて、ベンド管周
囲に強化プラスチックの被覆層を前述したような方法等
によ多形成して修理を完了する。That is, the reinforced plastic layer around the wear hole is removed, a piece of repair material (weldable material) similar to the wear hole is prepared, and this is fitted into the wear hole and welded. Then, a wear-resistant hardened metal is overlaid by welding, casting, etc. on the outer surface of the repair material piece, including the weld bead, and a part of the reinforced plastic layer is covered so as to cover this part. The repair is completed by forming a reinforced plastic coating layer around the bent pipe using the method described above.
なおこの場合、補修用素材片の内面に予め１ｌｌｉｔ
Ｍ純性硬化金属の肉盛、！ｌｌｌを施しておくと、嘔ら
に一層の寿命延長が図られるようになる。第８図はベン
ド管の補修部分の縦断面図であって、（８）が摩耗孔に
嵌め込んだ補修用素材片、（３）はその内面に予め肉盛
しておいたＦｍＭ耗性金属、（９）（９）は補修用素材
片と母体ベンド管素材部（１）との軟ｋＶ１４ｍ接部、
ｌ／／−
（３）は該軟鋼溶接部すなわち溶接ビードも含めて補修
用素材片の外面に盛金したｉｉ′＋ｌｉ耗性金属、転性
金属３）はこれに隣接する従来の耐摩耗性金属層、（６
）は補修用素材片外面の耐摩耗性金属の外側に施した新
たな強化プラスチック層、（６）（６）はこれに隣接す
る従来からの強化フ”ラヌチツク層である。In this case, apply 1 liter on the inner surface of the repair material piece in advance.
Overlay of M-purity hardened metal! By applying this treatment, you will be able to further extend your lifespan. FIG. 8 is a longitudinal cross-sectional view of the repaired part of the bent pipe, where (8) is a piece of repair material fitted into the wear hole, and (3) is the FmM wearable metal that has been overlaid on its inner surface in advance. , (9) (9) is the soft kV14m contact area between the repair material piece and the base bend pipe material part (1),
l//- (3) is the ii'+li wearable metal deposited on the outer surface of the repair material including the mild steel weld, that is, the weld bead, and the convertible metal 3) is the adjacent conventional wear-resistant metal. Metal layer, (6
) is a new reinforced plastic layer applied to the outside of the wear-resistant metal on the outer surface of the repair material, and (6) (6) is a conventional reinforced plastic layer adjacent to this.
次に本発明の実施効果について述べる。Next, the effects of implementing the present invention will be described.
内径１４３ ｉのカーボランダム等の研摩剤をポンプ輸
送するためのペンド管ベンド部で、炭素鋼
）°゛鋼管製の肉厚１１闘のものを比較例Ｎｏ、１とし
、同じ＜Ｃ：２．７％、 Ｃｒ ： ２７％の高クロム
鋳鉄性ベンＦ管で内周部肉厚ｌ ｌ ｍ、外周部肉厚１
６１肩のものを比較何階２とし、前記比較何階ｌのベン
ド管の外周部外側にＣ：６％、 Ｃｒ ： ２２％、
Ｎ’ｂ ：８％、 ＭＯ： ７％、Ｗ：２％、７２２％
の高クロム・ニオブ・モリブデン炭化物系硬化金属を盛
金し、硬度ＨＲＣ５３〜６５を与え、該部分を蔽うよう
にガラス繊維を巻付け、エポキシ樹脂を含浸し、コレを
５フ゛ライ実施して強化プラスチック層を形成した本発
明方法によるベンド管とを用いて耐久試験を実施した。The bent part of the pendant pipe for pumping abrasives such as carborundum with an inner diameter of 143 mm is made of carbon steel.
) °゛ A steel pipe with a wall thickness of 11 mm was used as Comparative Example No. 1, and the same high chromium cast iron Ben F pipe with <C: 2.7%, Cr: 27%, inner peripheral wall thickness l l m , peripheral wall thickness 1
61 Shoulder is compared as 2nd floor, and the outside of the outer periphery of the bent pipe of 1st floor of comparison is C: 6%, Cr: 22%,
N'b: 8%, MO: 7%, W: 2%, 722%
High chromium, niobium, molybdenum carbide-based hardened metal is deposited to give a hardness of HRC53 to 65, glass fiber is wrapped to cover the part, impregnated with epoxy resin, and this is repeated 5 times to create reinforced plastic. A durability test was conducted using a layered bent pipe made by the method of the present invention.
その結果、比較何階１は５日、比較何階２は８０日使用
後それぞれ穿孔したが、これに対し本発明方法によるベ
ンド管は９０日の使用に耐え、その後穿孔部を前記本発
明の方法で補修してさらに８０日の使用に十分附えるこ
とができた。As a result, the holes were perforated in Comparative Floor 1 after 5 days of use and in Comparative Floor 2 after 80 days of use.In contrast, the bent pipe according to the method of the present invention withstood 90 days of use, and after that, the perforated portion was replaced with the method of the present invention. By repairing it using this method, I was able to use it for another 80 days.
第１図はベンド管の斜視図。第２図は本発明方法を実施
したベンド管の縦断面部分図。第３図は本発明のベンド
管再生補修方法を説明する縦断面部分図である。
１、：ヘンド管素材、８：耐摩耗性硬化金属の盛金、４
：繊維、５：熱硬化性樹脂、６：強化プラスチック層、
８：補修用素材片、９：軟鋼溶接部、ｌＯ：研摩性媒体
自発手続補正書
１．事件の表示
一昭和５７年特許願第１０７０４２号
２、発明の名称
耐摩耗性ベンド管の製造方法
３、補正をする者
事件との関係 特許出願人
住 所 大阪市平野区加美束４丁目４番８８号名 称
アイエヌジ商事株式会社
代表者宮崎義弘
４、代理人
６、補正の対象
明細書の「発明の詳細な説明」の欄
７、補正の内容
（１） 明細書の第６頁第１２行に「硬化金属の盛県
層（３）が・・・」とあるを「硬化金属の盛金層（３）
が・・・」に訂正します。
以 上FIG. 1 is a perspective view of the bend pipe. FIG. 2 is a partial longitudinal cross-sectional view of a bent pipe in which the method of the present invention was applied. FIG. 3 is a partial vertical cross-sectional view illustrating the bent pipe regeneration and repair method of the present invention. 1.: Hend pipe material, 8: Wear-resistant hardened metal fillet, 4
: fiber, 5: thermosetting resin, 6: reinforced plastic layer,
8: Repair material piece, 9: Mild steel welded part, lO: Abrasive medium Voluntary procedure amendment form 1. Description of the case 1 Patent Application No. 107042 filed in 1982 2 Name of the invention Method for manufacturing wear-resistant bent pipes 3 Person making the amendment Relationship to the case Patent applicant address 4-4 Kamitsuka, Hirano-ku, Osaka City No. 88 name
ING Shoji Co., Ltd. Representative Yoshihiro Miyazaki 4, Agent 6 Column 7 of “Detailed Description of the Invention” of the specification subject to amendment, Contents of the amendment (1) Page 6, line 12 of the specification, “Hardened metal "The Moriken layer (3) of..." is replaced by "The Moriken layer (3) of hardened metal.
I am correcting it to "...". that's all
Claims (3)
なくとも彎曲部の外周の外側に耐摩耗性硬化金属を溶接
、鋳かけ等で肉盛シした後、該部分を蔽うようにベンド
管周囲に強化プラヌチツクの被覆層を形成することを特
徴とする耐摩耗性ベンド管の製造方法。(1) After overlaying a wear-resistant hardened metal on the outside of at least the outer periphery of the curved part of a bent pipe made of weldable iron or steel by welding, overlaying, etc., bend the pipe so as to cover that part. A method for producing a wear-resistant bent pipe, which comprises forming a reinforced planar coating layer around the pipe.
修しようとする孔に、該孔と略々同一形状の溶接可能な
鉄または鋼の素材片を嵌め込みベンド管と溶接した後、
該溶接ビードも含めて素材片の外面に耐摩耗性硬化金属
を溶接、鋳かけ等で肉盛りし、該部分を蔽うようにこれ
迄の強化プラスチック層に一部うツブさせてベンド管周
囲に強化プラヌチツクの被覆層を形成することを特徴と
する耐摩耗性ベンド管の補修方法。(2) After fitting a piece of weldable iron or steel material having approximately the same shape as the hole into the hole to be repaired in a bent pipe made of weldable iron or steel and welding it to the bent pipe,
A wear-resistant hardened metal is built up by welding, casting, etc. on the outer surface of the material piece, including the weld bead, and a part of the reinforced plastic layer that has been used so far is covered so as to cover this part, and it is placed around the bend pipe. A method for repairing a wear-resistant bent pipe, the method comprising forming a covering layer of reinforced plastic.
溶接可能な鉄または鋼の素材片の内面に予め耐摩耗性硬
化金属を肉盛りしておくことを特徴とする特許 ド管の補修方法。(3) A patented bent pipe characterized in that a wear-resistant hardened metal is built up in advance on the inner surface of a weldable piece of iron or steel material that has approximately the same shape as the hole to be repaired in the bent pipe. Repair method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57107042A JPS58222837A (en) | 1982-06-21 | 1982-06-21 | Manufacture of abrasion-resisting bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57107042A JPS58222837A (en) | 1982-06-21 | 1982-06-21 | Manufacture of abrasion-resisting bent pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58222837A true JPS58222837A (en) | 1983-12-24 |
| JPS624598B2 JPS624598B2 (en) | 1987-01-30 |
Family
ID=14449042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57107042A Granted JPS58222837A (en) | 1982-06-21 | 1982-06-21 | Manufacture of abrasion-resisting bent pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58222837A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001289387A (en) * | 2000-04-10 | 2001-10-19 | Ing Shoji Kk | Wear-resistant bend pipe and its manufacturing method |
| JP2002139190A (en) * | 2000-11-06 | 2002-05-17 | Ing Shoji Kk | Heat-resistant and wear-resistant bend pipe and manufacturing method therefor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4894013U (en) * | 1972-02-10 | 1973-11-10 | ||
| JPS5318814A (en) * | 1976-08-05 | 1978-02-21 | Toyota Motor Corp | Strengthening structure for steel pipe bending |
| JPS545815U (en) * | 1977-06-15 | 1979-01-16 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5184812A (en) * | 1975-01-23 | 1976-07-24 | Chiaki Yamada | KONKURIITOKUTAINOCHUKUKOKEISEIHOHOTOSOCHI |
-
1982
- 1982-06-21 JP JP57107042A patent/JPS58222837A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4894013U (en) * | 1972-02-10 | 1973-11-10 | ||
| JPS5318814A (en) * | 1976-08-05 | 1978-02-21 | Toyota Motor Corp | Strengthening structure for steel pipe bending |
| JPS545815U (en) * | 1977-06-15 | 1979-01-16 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001289387A (en) * | 2000-04-10 | 2001-10-19 | Ing Shoji Kk | Wear-resistant bend pipe and its manufacturing method |
| JP2002139190A (en) * | 2000-11-06 | 2002-05-17 | Ing Shoji Kk | Heat-resistant and wear-resistant bend pipe and manufacturing method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS624598B2 (en) | 1987-01-30 |
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