JPH08200184A - Manufacture of high pressure fuel injection pipe material for automobile - Google Patents
Manufacture of high pressure fuel injection pipe material for automobileInfo
- Publication number
- JPH08200184A JPH08200184A JP7033026A JP3302695A JPH08200184A JP H08200184 A JPH08200184 A JP H08200184A JP 7033026 A JP7033026 A JP 7033026A JP 3302695 A JP3302695 A JP 3302695A JP H08200184 A JPH08200184 A JP H08200184A
- Authority
- JP
- Japan
- Prior art keywords
- inner peripheral
- pipe material
- fuel injection
- dry ice
- peripheral wall
- 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
Landscapes
- Fuel-Injection Apparatus (AREA)
- Metal Extraction Processes (AREA)
- Heat Treatment Of Articles (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、管径６ｍｍ〜２０ｍｍ
で内径が１．２ｍｍ〜４ｍｍと細径で厚肉の自動車用高
圧燃料噴射管材の製造方法に関する。BACKGROUND OF THE INVENTION The present invention has a pipe diameter of 6 mm to 20 mm.
The present invention relates to a method for producing a high-pressure fuel injection pipe material for automobiles, which has a thin inner diameter of 1.2 mm to 4 mm and is thick.
【０００２】[0002]
【従来の技術】従来、自動車用高圧燃料噴射管材を製造
するには、厚肉の素管に潤滑のための伸管油を使用し、
ダイスとプラグを併用して、冷間引抜きを繰り返すこと
により、所定寸法の噴射管材に成形し、数次の冷間引抜
きにより、管肉厚部全体に生じた硬化組織を除去するた
めに、焼鈍調質処理によって、硬度減少と共に、結晶組
織の調整と内部応力除去を行っている。2. Description of the Related Art Conventionally, in order to manufacture a high-pressure fuel injection pipe material for automobiles, a pipe oil for lubrication is used for a thick wall pipe,
Repeated cold drawing using a die and plug to form an injection pipe material of a predetermined size, and annealing to remove the hardened structure generated in the entire thick wall of the pipe by several times of cold drawing. By the heat treatment, the hardness is reduced, and the crystal structure is adjusted and the internal stress is removed.
【０００３】そして、噴射用燃料の流通する細径孔が形
成された管材の細径孔内周に成形加工時に付着する、主
としてミクロンオーダーの異物を除去するために、管材
内周に対して、ブラッシング、エアーブロー、油圧噴
射、ショットブラスト或いはこれらを組合せて行って、
ピーリング効果（剥離効果）によって管材の内周面をク
リーニングしている。Then, in order to remove foreign matters of micron order, which are mainly adhered to the inner circumference of the small diameter hole of the pipe material in which the small diameter hole through which the fuel for injection flows is formed at the time of molding, Brushing, air blow, hydraulic injection, shot blasting or a combination of these,
The inner peripheral surface of the pipe material is cleaned by the peeling effect (peeling effect).
【０００４】[0004]
【発明が解決しようとする課題】前述の従来の自動車用
高圧燃料噴射管材の製造方法では、素管の有する内周面
の欠陥や冷間引抜き作業に伴って、細径孔内周壁に小さ
なヘアークラックが生じることがあり、また、冷間引抜
き後の焼き戻しによって、管肉厚部は残留応力の存在し
ない組織構造になっている。SUMMARY OF THE INVENTION In the above-mentioned conventional method for manufacturing a high-pressure fuel injection pipe material for an automobile, a small hair is formed on the inner peripheral wall of the small diameter hole due to a defect of the inner peripheral surface of the raw pipe or cold drawing work. Cracks may occur, and due to tempering after cold drawing, the thick walled portion has a microstructure with no residual stress.
【０００５】このために、高圧燃料噴射管として使用す
る場合に、燃料の噴射による細径孔内圧の急激な変動と
機関等の振動とによって、ヘアークラックが徐々に成長
し、やがて軸芯方向や円周方向に亀裂が生じるおそれが
あった。For this reason, when used as a high-pressure fuel injection pipe, a hair crack gradually grows due to a rapid change in the internal pressure of the small diameter hole due to the injection of fuel and vibration of the engine, etc., and eventually in the axial direction. There was a risk of cracks in the circumferential direction.
【０００６】また、従来の自動車用高圧燃料噴射管材の
製造方法の管内のクリーニングでは、噴射用燃料の流通
する内孔が１．０ｍｍ〜４．０ｍｍと細径であるため、
管内にクリーニング媒体としての流体は層流となり、充
分なクリーニング効果が得られず、さらにショットブラ
ストでは作業後にブラスト材の完全除去が難しいという
問題や除去しきれなかった異物が噴射ノズルのスプール
弁のロックや噴口を閉塞するという問題もみられた。Further, in the conventional cleaning of the inside of the pipe of the method for producing a high-pressure fuel injection pipe material for automobiles, the inner hole through which the injection fuel flows has a small diameter of 1.0 mm to 4.0 mm.
The fluid as a cleaning medium becomes a laminar flow in the pipe, a sufficient cleaning effect is not obtained, and it is difficult to completely remove the blast material after the work by shot blasting. There was also the problem of blocking locks and spouts.
【０００７】本発明は、前述したような自動車用高圧燃
料噴射管材の製造の現状に鑑みてなされたものであり、
その目的は、製造時の管内のクリーニングが完全に行わ
れ、燃料噴射管として使用された状態で、噴射ノズルの
スプール弁のロックや噴口の閉塞がなく、使用時にヘア
ークラックの成長を抑え、高圧耐久性に優れた自動車用
高圧燃料噴射管材の製造方法を提供することにある。The present invention has been made in view of the current state of manufacturing high-pressure fuel injection pipe materials for automobiles as described above,
Its purpose is to completely clean the inside of the pipe at the time of manufacture and to prevent the hair crack from growing during use without locking the spool valve of the injection nozzle or blocking the injection port when it is used as a fuel injection pipe, An object of the present invention is to provide a method of manufacturing a high-pressure fuel injection pipe material for an automobile having excellent durability.
【０００８】[0008]
【課題を解決するための手段】前記目的を達成するため
に、本発明は、噴射用燃料の流通する細径孔が長手方向
に形成された素管材に対して、ドライアイスの細粒を前
記細径孔の内周面に吹き付ける吹き付け工程を少なくと
も１回有することを特徴とするものである。In order to achieve the above-mentioned object, the present invention provides the above-mentioned method for forming fine particles of dry ice in a raw pipe material in which a small-diameter hole through which an injection fuel flows is formed. The method is characterized by having at least one spraying step of spraying the inner peripheral surface of the small diameter hole.
【０００９】更に前記吹き付け工程に先立って、前記原
管材を加熱する加熱工程を設け、該加熱工程の加熱温度
が、１００℃〜５００℃であることを特徴とするもので
ある。Further, a heating step for heating the raw tube material is provided prior to the spraying step, and the heating temperature in the heating step is 100 ° C to 500 ° C.
【００１０】[0010]
【作用】本発明では、自動車用高圧燃料噴射管を作成す
るための自動車用燃料噴射管材の製造に際して、吹き付
け工程が導入され、噴射用燃料の流通する細径孔が長手
方向に形成された素管材に対して、ドライアイスの細粒
が前記細径孔の内周面に、少なくとも最終伸管後１回、
好ましくは伸管工程毎に吹き付けられる。According to the present invention, when manufacturing a fuel injection pipe material for an automobile for producing a high pressure fuel injection pipe for an automobile, a spraying process is introduced, and a small diameter hole through which the injection fuel flows is formed in the longitudinal direction. With respect to the pipe material, fine particles of dry ice are provided on the inner peripheral surface of the small-diameter hole at least once after the final tube drawing,
It is preferably sprayed in each tube drawing step.
【００１１】このドライアイスの細粒の吹き付けによっ
て異物は細径孔の内周壁より剥離され、更に昇化により
炭酸ガスとなり１０００倍程度の体積に膨張してドライ
アイスと炭酸ガスが混在する粉粒体によって外部に放出
される。By spraying the fine particles of dry ice, the foreign matter is peeled off from the inner peripheral wall of the small-diameter hole, and is further promoted to become carbon dioxide gas which expands to a volume of about 1000 times and mixed with dry ice and carbon dioxide gas. It is released to the outside by the body.
【００１２】また、本発明では前記吹き付け工程に先立
って原管材を加熱する加熱工程を設けたため、内周壁に
は残留圧縮応力が発生する。Further, in the present invention, since the heating step of heating the raw pipe material is provided prior to the spraying step, residual compressive stress is generated on the inner peripheral wall.
【００１３】すなわち、前記加熱工程では厚肉細径金属
管材全体が均一に膨張した状態となるよう１００℃〜５
００℃に加熱する（図２（Ａ）参照）。That is, in the heating step, 100 ° C. to 5 ° C. so that the whole thick and thin metal pipe material is uniformly expanded.
Heat to 00 ° C. (see FIG. 2 (A)).
【００１４】次いでドライアイスの細粒を噴射すると前
記金属管材の内周壁の表層（表皮）が冷却されて収縮し
ようとする。しかし内周壁の表層以外（肉厚中央部、外
表面) は高温であるため膨張した肉厚状態を維持しよう
とするため、前記内周壁の表層は収縮できず引張りの内
部応力が発生する（図２（Ｂ）参照）。Then, when fine particles of dry ice are sprayed, the surface layer (skin) of the inner peripheral wall of the metal pipe material is cooled and tries to shrink. However, since the parts other than the surface layer of the inner peripheral wall (the central part of the wall thickness, the outer surface) are at high temperature, they try to maintain the expanded wall thickness state, so the surface layer of the inner peripheral wall cannot contract and internal tensile stress occurs (Fig. 2 (B)).
【００１５】この表層の内部応力はやがて弾性限界を越
えて塑性域に達し組織は永久変形して、内周壁面には引
張り残留応力が発生する。しかし冷却を継続すると、や
がて厚肉細径金属管材の外周側（肉厚中央部、外表面）
も冷却され管材全体としての縮径が起き、この全体とし
ての縮径によって内周壁の表層は収縮変形が可能となり
引張り残留応力は徐々に解放されてゆく。このような収
縮の過程で内周壁の表層の残留応力は一旦ゼロになる
が、全体の冷却が進むことにより収縮がさらに進行して
内周壁は外周面から圧縮を受ける。これにより全体の冷
却が終了した時点では内周壁には圧縮応力が残留するこ
とになる（図２（Ｃ）参照）。The internal stress of the surface layer eventually exceeds the elastic limit and reaches the plastic region, the structure is permanently deformed, and tensile residual stress is generated on the inner peripheral wall surface. However, if cooling is continued, the outer peripheral side (thickness center part, outer surface) of the thick and thin metal pipe material will eventually come out.
Also, the tube material is cooled and the diameter of the entire pipe material is reduced. Due to this overall diameter reduction, the surface layer of the inner peripheral wall can be contracted and deformed, and the tensile residual stress is gradually released. In the process of such shrinkage, the residual stress of the surface layer of the inner peripheral wall once becomes zero, but the shrinkage further progresses due to the progress of cooling of the whole, and the inner peripheral wall receives compression from the outer peripheral surface. As a result, compressive stress remains on the inner peripheral wall when the entire cooling is completed (see FIG. 2C).
【００１６】[0016]
【実施例】以下、本発明の一実施例を図１を参照して説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG.
【００１７】図１は本実施例による製造方法の説明図で
ある。FIG. 1 is an explanatory view of the manufacturing method according to this embodiment.
【００１８】本実施例では、鋼管、ステンレス管或いは
これらの合せ管等の厚肉の素管をダイスとプラグを併用
して数次の冷間引抜きを繰り返すことにより、細管孔径
が１. ２ｍｍ〜４ｍｍで外径が６ｍｍ〜３０ｍｍの厚肉
細径金属管材に成形する。In the present embodiment, a thick tube such as a steel tube, a stainless tube, or a combined tube thereof is repeatedly used for cold drawing several times by using a die and a plug together to obtain a thin tube hole diameter of 1.2 mm to It is formed into a thick and thin metal pipe material having an outer diameter of 4 mm and an outer diameter of 6 mm to 30 mm.
【００１９】次いで、このように成形された厚肉細径金
属管材１に対して、図１に示すように、ドライアイスブ
ラスト器２に接続されたドライアイス細粒の噴射用のノ
ズル３を配設し、ノズル３によって厚肉細径金属管材１
の細径孔５内に、ドライアイス細粒６を噴射する。Next, as shown in FIG. 1, a nozzle 3 for injecting dry ice fine particles, which is connected to a dry ice blasting device 2, is arranged on the thick and thin metal pipe material 1 thus formed. The thick and thin metal pipe material 1 is installed by the nozzle 3.
The dry ice fine particles 6 are sprayed into the small-diameter holes 5 in FIG.
【００２０】ノズル３からのドライアイス細粒６は、細
径孔５の内周壁に噴射され、また好ましくは予め１００
℃〜５００℃に加熱する加熱処理によって細径孔５の内
周壁に対する固着力が低下した成形加工時に生じた異物
は、ドライアイス細粒６によって細径孔５の内周壁から
剥離され、更に昇化により炭酸ガスとなり１０００倍程
度の体積に膨張して、高速で流出するドライアイスと炭
酸ガスの混在する粉粒体によって、厚肉細径金属管材１
外に放出され、厚肉細径金属管材１の細径孔５の内周面
のクリーニングが行われる。この場合、孔径が１．２ｍ
ｍ〜４ｍｍの細径孔５の内部で、ドライアイスの気化膨
張が起こるので、ドライアイスの高速乱流が発生し、管
内で層流が生じることはなく、細径孔５の内周面から剥
離された異物は、高速のドライアイスと炭酸ガスが混在
する粉粒体流によって、完全に厚肉細径金属管材１外に
放出される。The dry ice fine particles 6 from the nozzle 3 are sprayed on the inner peripheral wall of the small diameter hole 5, and preferably 100 in advance.
The adhesion force to the inner peripheral wall of the small-diameter hole 5 is reduced by the heat treatment of heating to 500 ° C to 500 ° C. The foreign matter generated at the time of molding is separated from the inner peripheral wall of the small-diameter hole 5 by the dry ice fine particles 6 and further raised. As a result, carbon dioxide gas expands to a volume of about 1000 times, and at a high speed, the dry-ice and carbon dioxide mixed powder particles form a thick and thin metal pipe material 1.
It is discharged to the outside and the inner peripheral surface of the small diameter hole 5 of the thick thin metal tube material 1 is cleaned. In this case, the hole diameter is 1.2m
Since vaporization and expansion of dry ice occurs inside the small-diameter hole 5 of m to 4 mm, high-speed turbulent flow of dry ice does not occur, and laminar flow does not occur in the pipe. The separated foreign matter is completely discharged to the outside of the thick and thin metal pipe material 1 by a high-speed powdery granular material flow in which dry ice and carbon dioxide are mixed.
【００２１】また図２に示したように、細径孔５の内周
面に噴射されるドライアイス細粒６によって、１００℃
〜５００℃に予め加熱された細径孔５の内周壁の表皮が
急冷され、細径孔５の肉厚部分との間に高い温度差が生
じ、細径孔５の内周壁が先行して収縮し、次いで外周面
側が収縮することによって、内周壁に圧縮応力が残留す
る。この残留圧縮応力によって、成形加工時に生じた細
径孔５の内周壁のヘアークラックは、周囲から押圧され
て密着した状態となる。したがって、この厚肉細径金属
管材１から高圧燃料噴射管を製造して使用する場合に、
ヘアークラックが、管内圧の急激な圧力変動や機関の振
動等によって、成長することが阻止され、安定した噴射
動作が行われ、その動作寿命を延長することが可能にな
る。Further, as shown in FIG. 2, the dry ice fine particles 6 sprayed on the inner peripheral surface of the small-diameter hole 5 allow 100 ° C.
The skin of the inner peripheral wall of the small-diameter hole 5 preheated to ˜500 ° C. is rapidly cooled, and a high temperature difference occurs between the skin and the thick portion of the small-diameter hole 5, and the inner peripheral wall of the small-diameter hole 5 precedes. By contracting and then contracting on the outer peripheral surface side, compressive stress remains on the inner peripheral wall. Due to this residual compressive stress, hair cracks on the inner peripheral wall of the small-diameter hole 5 generated during the molding process are pressed from the surroundings and come into close contact. Therefore, when manufacturing and using a high-pressure fuel injection pipe from this thick and thin metal pipe material 1,
The hair rack is prevented from growing due to a sudden pressure change in the pipe pressure, the vibration of the engine, etc., and a stable injection operation is performed, so that the operating life can be extended.
【００２２】このように、本実施例によると、成形され
た厚肉細径金属管材１を、好ましくは１００℃〜５００
℃に加熱した後に、厚肉細径金属管材１の細径孔５内
に、ドライアイス細粒６を噴射することにより、成形加
工時に厚肉細径金属管材１の細径孔５の内周面に付着し
た異物を完全に除去できると共に、細径孔５の内周壁に
圧縮応力を残留させ、燃料噴射管としての使用時に、管
内圧の急激な変動や機関の振動等によって、細径孔５の
内周壁のヘアークラックの成長を阻止し、安定した噴射
動作での動作寿命を延長することが可能になる。As described above, according to this embodiment, the molded thick and thin metal pipe material 1 is preferably 100 to 500 ° C.
After heating to ℃, by spraying dry ice fine particles 6 into the small-diameter hole 5 of the thick-walled small-diameter metal pipe material 1, the inner circumference of the small-diameter hole 5 of the thick-walled small-diameter metal pipe material 1 at the time of molding processing. Foreign substances adhering to the surface can be completely removed, and compressive stress remains on the inner peripheral wall of the small diameter hole 5, so that when used as a fuel injection pipe, the small diameter hole may be abruptly changed due to a sudden change in internal pressure or vibration of the engine. It is possible to prevent the growth of hair cracks on the inner peripheral wall of No. 5 and extend the operation life in a stable injection operation.
【００２３】[0023]
【発明の効果】以上の通り本発明によると、自動車用高
圧燃料噴射管を作成するための自動車用燃料噴射管材の
製造に際して、噴射用燃料の流通する細径孔が長手方向
に形成された素管材に対して、ドライアイスの細粒が前
記細径孔の内周面に吹き付けられるので、吹き付けられ
るドライアイスの細粒によって、噴射用燃料の流通する
細径孔の成形加工時に、細径孔の内周面に付着した異物
が叩き落とされ、気化ドライアイスの噴流と共に管外に
放出され、細径孔内周面を残留物なくクリーニングする
ことが可能になり、したがって噴射ノズルのスプール弁
のロックや噴口の閉塞を防止できる。また、ドライアイ
スの細粒の細径孔の内周面への吹き付けにより、細径孔
内周壁が急冷され収縮した状態となり、残留圧縮応力が
細径孔内周壁に分布するので、細径孔内周壁に存在する
ヘアークラックが、燃料噴出による管内圧の急激な変動
や機関の振動等によって、成長することが阻止され、安
定した噴射動作が行われ、その動作寿命を延長すること
が可能になる。As described above, according to the present invention, when manufacturing a fuel injection pipe material for an automobile for producing a high-pressure fuel injection pipe for an automobile, a small-diameter hole through which an injection fuel flows is formed in a longitudinal direction. Since fine particles of dry ice are sprayed onto the inner peripheral surface of the small-diameter hole with respect to the pipe material, the small-sized holes of the dry ice that are sprayed are used to form the small-sized holes when the injection fuel flows. Foreign matter adhering to the inner peripheral surface of is sprayed off along with the jet stream of vaporized dry ice, and it becomes possible to clean the inner peripheral surface of the small diameter hole without residue. It is possible to prevent locks and blockage of the nozzle. Also, by spraying the inner wall of the small hole of dry ice with a small diameter, the inner wall of the small hole is rapidly cooled and contracted, and residual compressive stress is distributed to the inner wall of the small hole. Hair cracks existing on the inner wall are prevented from growing due to abrupt fluctuations in the pipe pressure due to fuel injection, vibration of the engine, etc., and stable injection operation is performed, making it possible to extend the operating life. Become.
【００２４】更に本発明によると、噴射用燃料の流通す
る細径孔が長手方向に形成された素管材が加熱され、加
熱後にドライアイスの細粒が細径孔の内周面に吹き付け
られるので、加熱によって異物の細径孔内周面への固着
力を低下させ、気化ドライアイスの流速が早くなり、ク
リーニング効果をより高めることが可能になると共に、
ドライアイス吹き付けにより細径孔内周により大きな残
留圧縮応力が発生し、ヘアークラックの成長阻止効果を
高めることが可能になる。Further, according to the present invention, the raw pipe material having the small diameter hole through which the fuel for injection flows is formed in the longitudinal direction is heated, and the fine particles of dry ice are sprayed on the inner peripheral surface of the small diameter hole after heating. By heating, the adhesion force of foreign matter to the inner peripheral surface of the small diameter hole is reduced, the flow rate of vaporized dry ice is increased, and the cleaning effect can be further enhanced.
By spraying dry ice, a large residual compressive stress is generated on the inner circumference of the small diameter hole, and it becomes possible to enhance the effect of inhibiting the growth of hair cracks.
【図１】本発明の一実施例の製造方法の説明図である。FIG. 1 is an explanatory diagram of a manufacturing method according to an embodiment of the present invention.
【図２】本発明により得られる残留圧縮応力の発生メカ
ニズムを示す図で、（Ａ）は第１段階、（Ｂ）は第２段
階、（Ｃ）は第３段階を示すグラフである。FIG. 2 is a diagram showing a mechanism of residual compressive stress generation obtained by the present invention, in which (A) is a first stage, (B) is a second stage, and (C) is a third stage.
１ 厚肉細径金属管材 ２ ドライアイスブラスト器 ３ ノズル ５ 細径孔 ６ ドライアイス細粒 1 Thick and thin metal pipe material 2 Dry ice blasting device 3 Nozzle 5 Small diameter hole 6 Dry ice fine grain
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｍ 55/00 Ｚ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display area F02M 55/00 Z
Claims (3)
対して、ドライアイスの細粒を前記細径孔の内周面に吹
き付ける吹き付け工程を少なくとも１回有することを特
徴とする自動車用高圧燃料噴射管材の製造方法。1. An automobile comprising at least one spraying step of spraying fine particles of dry ice onto the inner peripheral surface of the small diameter hole in the tube material having the small diameter hole formed in the longitudinal direction. For manufacturing high pressure fuel injection pipes for automobiles.
材を加熱する加熱工程を設けたことを特徴とする請求項
１記載の自動車用高圧燃料噴射管材の製造方法。2. The method for manufacturing a high-pressure fuel injection pipe material for an automobile according to claim 1, further comprising a heating step of heating the raw pipe material prior to the spraying step.
５００℃であることを特徴とする請求項２記載の自動車
用高圧燃料噴射管材の製造方法。3. The heating temperature in the heating step is 100.degree.
The method for producing a high-pressure fuel injection pipe material for an automobile according to claim 2, wherein the temperature is 500 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7033026A JPH08200184A (en) | 1995-01-30 | 1995-01-30 | Manufacture of high pressure fuel injection pipe material for automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7033026A JPH08200184A (en) | 1995-01-30 | 1995-01-30 | Manufacture of high pressure fuel injection pipe material for automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08200184A true JPH08200184A (en) | 1996-08-06 |
Family
ID=12375282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7033026A Pending JPH08200184A (en) | 1995-01-30 | 1995-01-30 | Manufacture of high pressure fuel injection pipe material for automobile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08200184A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150131380A (en) * | 2013-03-18 | 2015-11-24 | 산드빅 마테리알스 테크놀로지 도이칠란트 게엠베하 | Method for producing a steel tube including cleaning of the inner tube wall |
-
1995
- 1995-01-30 JP JP7033026A patent/JPH08200184A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150131380A (en) * | 2013-03-18 | 2015-11-24 | 산드빅 마테리알스 테크놀로지 도이칠란트 게엠베하 | Method for producing a steel tube including cleaning of the inner tube wall |
| JP2016512794A (en) * | 2013-03-18 | 2016-05-09 | サンドヴィック マテリアルズ テクノロジー ドイチュラント ゲーエムベーハー | Method for manufacturing a steel pipe including cleaning of the inner wall of the pipe |
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