JP2701120B2 - Manufacturing method of cold water resistant pitting copper tube - Google Patents
Manufacturing method of cold water resistant pitting copper tubeInfo
- Publication number
- JP2701120B2 JP2701120B2 JP5139071A JP13907193A JP2701120B2 JP 2701120 B2 JP2701120 B2 JP 2701120B2 JP 5139071 A JP5139071 A JP 5139071A JP 13907193 A JP13907193 A JP 13907193A JP 2701120 B2 JP2701120 B2 JP 2701120B2
- Authority
- JP
- Japan
- Prior art keywords
- copper tube
- tube
- copper
- pipe
- hydrogen gas
- 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.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐冷水型孔食用銅管の
製造方法、詳しくは、ビル、マンション、一般住宅等の
建築用給水、給湯配管、湯沸器用伝熱管、冷温水を使用
する空調機器用配管および伝熱管等に適用される軟質な
いし半硬質りん脱酸銅管の製造工程において、管内面に
残留する遊離炭素に基づく炭素質皮膜の形成を低減する
ための調質焼鈍処理を行う耐冷水型孔食用銅管の製造方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cold water resistant copper pipe for pitting corrosion, and more particularly, to using water supply for buildings, condominiums, general houses, etc., hot water supply pipes, heat transfer tubes for water heaters, and cold / hot water. Annealing treatment to reduce the formation of a carbonaceous film based on free carbon remaining on the inner surface of the pipe in the process of manufacturing soft or semi-hard phosphorous deoxidized copper pipe applied to air conditioning equipment piping and heat transfer pipe etc. The present invention relates to a method for producing a cold water resistant pitting copper pipe.
【０００２】[0002]
【従来の技術】配管用軟質ないし半硬質りん脱酸銅管の
製造においては、銅管の抽伸工程で使用される潤滑油が
管内面に残存し、この残存潤滑油が引き続いて行われる
調質焼鈍処理により炭素質皮膜に変化して管内に不均一
に残留する。2. Description of the Related Art In the production of soft or semi-hard phosphorus deoxidized copper pipe for piping, lubricating oil used in a drawing process of the copper pipe remains on the inner surface of the pipe, and the remaining lubricating oil is subsequently subjected to refining. It changes into a carbonaceous film by the annealing treatment and remains unevenly in the tube.
【０００３】硬水を使用する欧米では、従来から給水、
給湯用配管として使用されるりん脱酸銅管にＩ（いち）
型孔食の発生が経験されているが、このＩ（いち）型孔
食は銅管内に残留する前記炭素質皮膜に起因するものと
推定されており、炭素質皮膜の形成を防止し、あるいは
残留炭素質皮膜を除去するために、炭素質皮膜をサンド
ブラスト等で機械的に除去する方法（BS規格 2871)や、
通常の焼鈍処理後、銅管内面を有機溶剤で洗浄、脱脂
し、酸化性混合ガスを管内に通しながら焼鈍して管内に
炭素質皮膜が残留するのを防止する方法（GB 2,041,483
号) が提案されている。[0003] In the United States and Europe using hard water,
I (Ichi) for phosphorus deoxidized copper pipe used as hot water supply pipe
Although type I pitting has been experienced, it is presumed that this type I (I) type pitting is caused by the carbonaceous film remaining in the copper tube, and the formation of the carbonaceous film is prevented. Alternatively, in order to remove the residual carbonaceous film, a method of mechanically removing the carbonaceous film by sandblasting (BS standard 2871),
After normal annealing, the inner surface of the copper tube is washed and degreased with an organic solvent, and annealed while passing an oxidized mixed gas through the tube to prevent the carbonaceous film from remaining in the tube (GB 2,041,483).
No.) has been proposed.
【０００４】我が国では、使用水質が軟水であるため、
これまで給水、給湯用りん脱酸銅管に欧米でみられるＩ
（いち）型孔食は殆ど経験されておらず、銅管内面に残
留する炭素質皮膜の形成防止や除去については製造上の
管理範囲外となっていた。しかし、最近、軟水の地下水
使用において経験されるようになった冷水型孔食は、腐
食形態、腐食生成物等がＩ（いち）型孔食と類似してお
り、Ｉ（いち）型孔食の場合と同様、銅管内の残留炭素
質皮膜をなくすことが冷水型孔食の防止対策になること
が明らかにされてきている。[0004] In Japan, the quality of water used is soft,
Up to now, I have seen phosphorus and deoxidized copper pipes for water and hot water supply
(1) Almost no pitting corrosion was experienced, and the prevention and removal of the carbonaceous film remaining on the inner surface of the copper tube was out of the control range in production. However, the cold water type pitting corrosion that has recently been experienced in the use of soft water groundwater is similar to the type I (one) type pit in terms of the form of corrosion, corrosion products, and the like. As in the case of (1), it has been revealed that elimination of the residual carbonaceous film in the copper tube is a measure for preventing cold water pitting.
【０００５】通常、りん脱酸銅管の製造においては、外
観上の商品価値の観点から、銅管内外面の酸化変色を防
ぐために、管内外面を窒素ガス、ＤＸガス等の非酸化性
ガス雰囲気あるいは還元性ガス雰囲気として焼鈍処理を
施すが、この処理では管内に残留する炭素質皮膜は除去
できない。[0005] Usually, in the production of a phosphor-deoxidized copper tube, from the viewpoint of commercial value in appearance, in order to prevent oxidation and discoloration of the inner and outer surfaces of the copper tube, the inner and outer surfaces of the tube are exposed to a non-oxidizing gas atmosphere such as nitrogen gas or DX gas. Alternatively, annealing treatment is performed in a reducing gas atmosphere, but this treatment cannot remove the carbonaceous film remaining in the pipe.
【０００６】欧米で提案されている前記サンドブラスト
等の機械的除去方法では、アルミナ等の微細粒を高速、
高圧で管内に噴射するための大型設備が必要となるとと
もに、作業中に微細粒の破砕粉が多量に発生して噴霧状
となり環境を害するおそれがある。また、りん脱酸銅管
は、製造工程においてコイル状で取り扱われることが少
なくないが、この方法はコイル状銅管の処理には適用で
きないという難点もある。管内を洗浄後、酸化性ガスを
管内に通して焼鈍する方法は、通常焼鈍処理、有機溶剤
洗浄の前処理が必要なため作業工程が多くなり製造コス
トを増大させるとともに、有機溶剤で洗浄するため、環
境対策上使用後の有機溶剤を処理する必要があるから、
処理費用が嵩み製造コストの増大を招く。In the mechanical removal method such as sand blasting proposed in Europe and the United States, fine particles such as alumina are removed at high speed.
A large-sized facility for injecting into the pipe at high pressure is required, and a large amount of crushed fine particles are generated during the operation, resulting in a spray state, which may harm the environment. Further, phosphorous deoxidized copper tubes are often handled in the form of coils in the manufacturing process, but there is a drawback that this method cannot be applied to the treatment of coiled copper tubes. After cleaning the inside of the pipe, the method of annealing by passing an oxidizing gas through the pipe is usually an annealing treatment, and requires a pretreatment of organic solvent cleaning, so that the number of working steps increases and the production cost increases, and the cleaning with an organic solvent is performed. Because it is necessary to treat the used organic solvent for environmental measures,
The processing cost increases and the production cost increases.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、給水、給湯
用等の配管用銅管として使用され、調質のための焼鈍処
理を実施する軟質ないし半硬質りん脱酸銅管内に形成さ
れる炭素質皮膜をなくすための製造方法について鋭意研
究した結果としてなされたものであり、その目的は、上
記従来の除去方法における問題点を解消し、配管用りん
脱酸銅管の製造において、製造コストの増大を招くこと
なく、また環境上の問題もなく管内に生じる炭素質皮膜
を除去でき、コイル状銅管の処理にも適用できる新規な
調質焼鈍処理を行う耐冷水型孔食用銅管の製造方法を提
供することにある。SUMMARY OF THE INVENTION The present invention is used as a copper pipe for piping for water supply, hot water supply and the like, and is formed in a soft or semi-hard phosphorus deoxidized copper pipe for performing an annealing treatment for heat treatment. It has been made as a result of earnest research on a manufacturing method for eliminating carbonaceous coatings, and aims at solving the problems of the above-mentioned conventional removal method and manufacturing a phosphorus deoxidized copper pipe for piping. A new cold-water resistant pitting copper tube with a new temper annealing treatment that can remove the carbonaceous film generated inside the tube without increasing the cost and without environmental problems, and can be applied to the treatment of coiled copper tubes. It is to provide a manufacturing method of.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
めの本発明による耐冷水型孔食用銅管の製造方法は、調
質のための焼鈍処理を行う配管用軟質ないし半硬質りん
脱酸銅管の製造方法において、抽伸加工した銅管の内部
を水素ガスで置換した後、非酸化性または還元性雰囲気
中で焼鈍処理し、銅管内面の炭素質皮膜形成を低減する
ことを構成上の基本的特徴とし、水素ガスが純度９９％
以上の水素ガスであることを構成上の第２の特徴とし、
銅管内を水素ガスで置換した後銅管の両端を密封し、非
酸化性または還元性雰囲気中で焼鈍処理すること、およ
び銅管内を水素ガスで置換した後、銅管の両端を密封す
ることなく焼鈍処理することをそれぞれ構成上の第３お
よび第４の特徴とする。SUMMARY OF THE INVENTION In order to achieve the above object, a method for producing a cold water resistant pitting copper pipe according to the present invention is provided. In the method of manufacturing a copper tube, after replacing the inside of the drawn copper tube with hydrogen gas, annealing is performed in a non-oxidizing or reducing atmosphere to reduce the formation of a carbonaceous film on the inner surface of the copper tube. The basic feature is that hydrogen gas is 99% pure
The second feature of the constitution is that the above hydrogen gas is used,
After replacing the inside of the copper tube with hydrogen gas, seal both ends of the copper tube and perform annealing treatment in a non-oxidizing or reducing atmosphere. After replacing the inside of the copper tube with hydrogen gas, seal both ends of the copper tube. Annealing without performing is a third and fourth feature of the configuration, respectively.
【０００９】本発明は、抽伸加工後に焼鈍による軟化処
理を行う軟質ないし半硬質りん脱酸銅管に適用される。
銅管を抽伸加工した場合、抽伸工程で使用される高級炭
化水素を含む潤滑油が管内に残存することは避けられ
ず、引き続いて行われる焼鈍処理において、高級炭化水
素は熱分解反応により芳香族炭化水素ならびに低級炭化
水素に変化する。通常の焼鈍雰囲気においては、焼鈍処
理中、芳香族炭化水素はさらにタールを経て炭素に変化
し、この炭素が皮膜状となって銅管内に不均一に残留す
る。The present invention is applied to a soft or semi-hard phosphor deoxidized copper tube which is subjected to a softening treatment by annealing after drawing.
When the copper tube is drawn, it is inevitable that the lubricating oil containing higher hydrocarbons used in the drawing process remains in the tube, and in the subsequent annealing treatment, the higher hydrocarbons are converted into aromatics by a thermal decomposition reaction. Changes to hydrocarbons and lower hydrocarbons. In a normal annealing atmosphere, during the annealing process, the aromatic hydrocarbon is further converted to carbon via tar, and this carbon becomes a film and remains unevenly in the copper tube.
【００１０】本発明は、銅管を抽伸加工した後、管内雰
囲気を水素ガスで置換し、その後非酸化性または還元性
雰囲気で焼鈍処理することにより、銅管内面の炭素質皮
膜の形成を低減するものである。水素ガスは、抽伸加工
の潤滑油に含まれる高級炭化水素が遊離炭素生成の原因
となる芳香族炭化水素に変わるのを防止する。銅管内を
水素ガスで置換した場合、焼鈍処理時、水素ガスによる
爆発の危険性があるため、焼鈍処理における炉内雰囲気
を非酸化性または還元性雰囲気とする。この炉内雰囲気
を形成するために、窒素ガスやＤＸガスが使用される。
これらのガスの使用により処理銅管の外面の酸化も防止
され、外観上の品質価値も向上する。The present invention reduces the formation of a carbonaceous film on the inner surface of a copper tube by drawing the copper tube, replacing the atmosphere in the tube with hydrogen gas, and then annealing in a non-oxidizing or reducing atmosphere. Is what you do. The hydrogen gas prevents higher hydrocarbons contained in the lubricating oil of the drawing process from being converted into aromatic hydrocarbons that cause free carbon generation. If the inside of the copper tube is replaced with hydrogen gas, there is a risk of explosion due to hydrogen gas during the annealing process. Therefore, the atmosphere in the furnace in the annealing process is set to a non-oxidizing or reducing atmosphere. Nitrogen gas or DX gas is used to form this furnace atmosphere.
The use of these gases also prevents the oxidation of the outer surface of the treated copper tube, and improves the quality value in appearance.
【００１１】使用する水素ガスは、純度の高いものがよ
く、純度９９％以上のものを使用するのが好ましい。純
度９９％以上の一般的工業レベルの水素の使用は、処理
コストを大幅に増加することなく炭素質皮膜形成低減の
効果が十分得られる。本発明においては、管内を水素ガ
スで置換した後、直管の場合には、管の両端を密封して
焼鈍処理するのが好ましいが、コイル状の場合には、管
の両端を密封することなく焼鈍処理しても管内雰囲気が
保持されており、十分な炭素質皮膜形成低減効果を得る
ことができる。The hydrogen gas to be used preferably has a high purity, and preferably has a purity of 99% or more. The use of hydrogen of a general industrial level having a purity of 99% or more can sufficiently obtain the effect of reducing the formation of the carbonaceous film without greatly increasing the processing cost. In the present invention, after replacing the inside of the pipe with hydrogen gas, in the case of a straight pipe, it is preferable to perform annealing treatment by sealing both ends of the pipe, but in the case of a coil shape, it is preferable to seal both ends of the pipe. Even after the annealing treatment, the atmosphere in the pipe is maintained, and a sufficient carbonaceous film formation reduction effect can be obtained.
【００１２】[0012]
【作用】本発明は上記の構成からなり、抽伸加工後、調
質焼鈍処理する配管用りん脱酸銅管の製造において、抽
伸加工した銅管の内部を水素ガスで置換してから焼鈍処
理を行うから、管内の水素濃度が高く、従って、潤滑油
に含まれる高級炭化水素から焼鈍時の熱分解により生成
した芳香族炭化水素は、水素化反応により、その殆どが
低級炭化水素に変化し、炭素質皮膜形成の原因となる遊
離炭素の生成を抑え、炭素質皮膜の形成を大幅に低減
し、耐冷水型孔食の発生を防止する。According to the present invention, in the production of a phosphorus deoxidized copper pipe for piping to be subjected to a temper annealing treatment after drawing processing, the inside of the drawn copper pipe is replaced with hydrogen gas and then subjected to annealing treatment. Since the hydrogen concentration in the pipe is high, aromatic hydrocarbons generated by pyrolysis during annealing from higher hydrocarbons contained in lubricating oil are mostly converted to lower hydrocarbons by hydrogenation reaction, The formation of free carbon, which causes the formation of a carbonaceous film, is suppressed, the formation of a carbonaceous film is significantly reduced, and the occurrence of cold water resistant pitting corrosion is prevented.
【００１３】[0013]
【実施例】以下、本発明の実施例を比較例と対比して説
明する。 実施例１ りん脱酸銅管（JIS H3300 C1220)を、炭化水素系高分子
化合物を主成分とする動粘度500cSt(40 ℃) 、残留炭素
分0.01％の潤滑油（潤滑油Ａ）を用いて抽伸加工し、管
外径15.88mm 、肉厚0.71mm、長さ2,000mm の管とした。
このりん脱酸銅管の内部を、一般工業用（純度99.99 ％
以上）の水素ガスにより置換した後、管の両端部をスウ
ェージロックを用いて機械的に密封し、窒素ガス雰囲気
中において600 ℃で30min 焼鈍処理を施した。Hereinafter, examples of the present invention will be described in comparison with comparative examples. Example 1 A phosphorous deoxidized copper tube (JIS H3300 C1220) was used with a lubricating oil (lubricating oil A) having a kinematic viscosity of 500 cSt (40 ° C.) and a residual carbon content of 0.01% (lubricating oil A) containing a hydrocarbon polymer as a main component. Drawing was performed to make a tube with a tube outer diameter of 15.88 mm, a wall thickness of 0.71 mm, and a length of 2,000 mm.
The inside of this phosphor deoxidized copper tube is used for general industry (purity 99.99%
After replacement with hydrogen gas as described above, both ends of the tube were mechanically sealed using a Swagelok, and annealed at 600 ° C. for 30 minutes in a nitrogen gas atmosphere.
【００１４】焼鈍処理後、管内に残留する炭素質皮膜量
を以下の方法で測定し、遊離炭素量を求めた。 (1) 管内に1-1-1 トリクロルエタンを充填して残留油分
を除去する。 (2) 管内を乾燥後、硝酸(1＋1)を注入し、管内全表面を
溶解することにより残留した炭素質皮膜を除去し、硝酸
溶液中に溶解する。 (3) 炭素質皮膜を溶解した硝酸溶液を、予め加熱処理し
たガラス濾紙を用いて吸引濾過し、濾紙上に炭素質皮膜
を採取する。 (4) 採取した炭素質皮膜を、濾紙とともに酸素気流中で
燃焼し、発生する炭素ガスを電量滴定法により定量し、
遊離炭素を求める。 管内に残留した遊離炭素量の測定結果を表１に示す。After the annealing treatment, the amount of carbonaceous film remaining in the tube was measured by the following method to determine the amount of free carbon. (1) Fill the tube with 1-1-1 trichloroethane to remove residual oil. (2) After drying the inside of the tube, nitric acid (1 + 1) is injected, and the entire surface of the tube is dissolved to remove the remaining carbonaceous film, and dissolved in a nitric acid solution. (3) The nitric acid solution in which the carbonaceous film is dissolved is suction-filtered using a glass filter paper that has been previously heat-treated, and the carbonaceous film is collected on the filter paper. (4) The collected carbonaceous film is burned together with filter paper in an oxygen stream, and the carbon gas generated is quantified by coulometric titration.
Determine free carbon. Table 1 shows the measurement results of the amount of free carbon remaining in the tube.
【００１５】比較例１ 実施例１と同じ条件で抽伸加工した同一材質、同一寸法
のりん脱酸銅管の内部を空気および99.9％窒素ガスによ
り置換した後、実施例１と同じ条件で焼鈍処理し、実施
例１と同様に遊離炭素量を測定した結果を表１に示す。COMPARATIVE EXAMPLE 1 After replacing the inside of a phosphor deoxidized copper tube of the same material and the same dimensions drawn under the same conditions as in Example 1 with air and 99.9% nitrogen gas, annealing was performed under the same conditions as in Example 1. Table 1 shows the results of measuring the amount of free carbon in the same manner as in Example 1.
【００１６】[0016]
【表１】 [Table 1]
【００１７】表１に示されるように、本発明により処理
されたりん脱酸銅管は、管内残留遊離炭素量が従来より
大幅に減少しており、管内面の酸化変色も認められず、
外観品質も優れていた。一方、比較例による銅管は遊離
炭素量が多く、置換ガスとして空気を用いた場合は管内
に酸化変色もみられた。As shown in Table 1, in the phosphor-deoxidized copper tube treated according to the present invention, the amount of residual free carbon in the tube is significantly reduced, and no oxidation discoloration of the tube inner surface is observed.
The appearance quality was also excellent. On the other hand, the copper tube according to the comparative example had a large amount of free carbon, and when air was used as a replacement gas, oxidation discoloration was also observed in the tube.
【００１８】実施例２ りん脱酸銅管（JIS H3300 C1220)を、実施例１で使用し
た潤滑油Ａ、および炭化水素系高分子化合物を主成分と
する動粘度150cSt(40 ℃) 、残留炭素分0.01％以下の潤
滑油（潤滑油Ｂ）を用いてブルブロック抽伸し、管外径
22.22mm 、肉厚0.81mm、長さ100mのコイル形状に加工し
た。このコイル状銅管の内部を、一般工業用（純度99.9
9 ％以上）の水素ガスで置換した後、管の両端を密封す
ることなくＤＸガス雰囲気中において600 ℃で30min の
焼鈍処理を施した。Example 2 Phosphorus-deoxidized copper tube (JIS H3300 C1220) was prepared by using the lubricating oil A used in Example 1 and a kinematic viscosity of 150 cSt (40 ° C.) containing a hydrocarbon polymer as a main component and a residual carbon Using a lubricating oil (lubricating oil B) of 0.01% or less per minute
It was processed into a coil shape with a length of 22.22 mm, a wall thickness of 0.81 mm and a length of 100 m. The inside of this coiled copper tube is used for general industry (purity 99.9
(9% or more), the tube was annealed at 600 ° C. for 30 minutes in a DX gas atmosphere without sealing both ends of the tube.
【００１９】焼鈍処理後、各コイル状銅管の両端部、お
よび中央部の３か所から長さ2mの分析用サンプルを採取
し、実施例１に示した方法により管内の残留炭素質皮膜
量を遊離炭素量で判定した。結果を表２に示す。After the annealing treatment, samples for analysis having a length of 2 m were taken from the three end portions and the central portion of each coiled copper tube, and the amount of residual carbonaceous film in the tubes was determined by the method shown in Example 1. Was determined by the amount of free carbon. Table 2 shows the results.
【００２０】比較例２ 実施例２と同じ条件で抽伸加工した同一材質、同一寸法
のりん脱酸銅管の内部をN2＋5 ％H2ガスで置換した後、
実施例２と同様の焼鈍処理を施した。焼鈍後、各コイル
状銅管内部の遊離炭素量を実施例２と同様の方法で測定
した。測定結果を表２に示す。Comparative Example 2 After replacing the inside of a phosphor-deoxidized copper tube of the same material and the same dimensions drawn by the same conditions as in Example 2 with N 2 + 5% H 2 gas,
The same annealing treatment as in Example 2 was performed. After annealing, the amount of free carbon inside each coiled copper tube was measured in the same manner as in Example 2. Table 2 shows the measurement results.
【００２１】[0021]
【表２】 [Table 2]
【００２２】表２に示されるように、本発明に従って処
理された銅管の遊離炭素量は、比較例による銅管の遊離
炭素量の1/2 〜1/4 に低減されており、管内外面の酸化
変色もみられなかった。As shown in Table 2, the amount of free carbon of the copper tube treated according to the present invention was reduced to 1/2 to 1/4 of the amount of free carbon of the copper tube according to the comparative example. No oxidation discoloration was observed.
【００２３】実施例３ りん脱酸銅管（JIS H3300 C1220)を、実施例１および実
施例２で使用した潤滑油Ａおよび潤滑油Ｂを用いてブル
ブロック抽伸し、管外径15.88mm 、肉厚0.71mm、長さ1,
800mのコイル状に加工した。このコイル状銅管の内部
を、一般工業用（純度99.99 ％以上）の水素ガスで置換
した後、ローラーハース炉を用い、DXガス雰囲気中で連
続焼鈍処理した。焼鈍処理後、各コイル状銅管の両端部
および中央部の3 か所から長さ2mの分析用サンプルを採
取し、実施例１に示した方法に従って管内の残留炭素皮
膜量を遊離炭素量で判定した。結果を表３に示す。Example 3 A phosphor deoxidized copper tube (JIS H3300 C1220) was subjected to bull block drawing using the lubricating oil A and the lubricating oil B used in Examples 1 and 2, and the tube had an outer diameter of 15.88 mm and had a wall thickness of 15.88 mm. 0.71mm thick, 1 length
It was processed into an 800 m coil shape. After the inside of the coiled copper tube was replaced with hydrogen gas for general industrial use (purity of 99.99% or more), continuous annealing was performed in a DX gas atmosphere using a roller hearth furnace. After the annealing treatment, samples for analysis of 2 m in length were taken from the three ends of both ends and the center of each coiled copper tube, and the amount of residual carbon film in the tubes was determined by the amount of free carbon according to the method described in Example 1. Judged. Table 3 shows the results.
【００２４】比較例３ 実施例３と同じ条件で抽伸加工した同一材質、同一寸法
のりん脱酸銅管の内部をN2＋5 ％H2ガスで置換し、実施
例３と同じ条件で焼鈍処理した後、実施例３と同様の方
法で遊離炭素量を測定した。測定結果を表３に示す。Comparative Example 3 An interior of a phosphor-deoxidized copper tube of the same material and the same dimensions, which had been drawn under the same conditions as in Example 3, was replaced with N 2 + 5% H 2 gas, and annealing was performed under the same conditions as in Example 3. After that, the amount of free carbon was measured in the same manner as in Example 3. Table 3 shows the measurement results.
【００２５】[0025]
【表３】 [Table 3]
【００２６】表３に示すように、本発明に従って処理さ
れた銅管内の遊離炭素量は、比較例による銅管内の遊離
炭素の1/3 〜1/10に低減しており、管内面の酸化変色も
認められなかった。As shown in Table 3, the amount of free carbon in the copper tube treated according to the present invention was reduced to 1/3 to 1/10 of the free carbon in the copper tube according to the comparative example. No oxidation discoloration was observed.
【００２７】[0027]
【発明の効果】本発明によれば、配管用りん脱酸銅管の
炭素質皮膜形成を大幅に低減することができるから、配
管用銅管に対する冷水型孔食の発生を防止することが可
能となる。また本発明は、水素ガス供給装置を設置し、
水素ガス導入工程を付加するだけで、既存の設備構成に
より従来の工程を殆ど変えることなく実施することがで
きるから、製造コストの増大を招くことがなく、耐冷水
型孔食を有する銅管の安定供給に役立ち工業上きわめて
有用である。According to the present invention, it is possible to greatly reduce the formation of a carbonaceous film on a phosphorus deoxidized copper pipe for piping, thereby preventing the occurrence of cold water pitting on the copper pipe for piping. Becomes The present invention also provides a hydrogen gas supply device,
By simply adding the hydrogen gas introduction step, the conventional equipment can be implemented with almost no change in the existing equipment configuration, so that the production cost does not increase and the copper pipe having the cold water resistant pitting corrosion can be used. It contributes to stable supply and is extremely useful in industry.
───────────────────────────────────────────────────── 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 Ｃ２２Ｆ 1/00 ６８５ 8719−4Ｋ Ｃ２２Ｆ 1/00 ６８５Ｚ ６８６ 8719−4Ｋ ６８６Ａ ６９１ 8719−4Ｋ ６９１Ｚ (72)発明者 澤 聖健 東京都港区新橋５丁目11番３号 住友軽 金属工業株式会社内 (56)参考文献 特開 平２−250945（ＪＰ，Ａ) 特開 昭55−73821（ＪＰ，Ａ) 特公 昭56−5288（ＪＰ，Ｂ２)────────────────────────────────────────────────── 6 Continuation of the front page (51) Int.Cl. 6 Identification number Agency reference number FI Technical indication location C22F 1/00 685 8719-4K C22F 1/00 685Z 686 8719-4K 686A 691 8719-4K 691Z (72 ) Inventor Seike Sawa 5-11-3, Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industries Co., Ltd. (56) References JP-A-2-250945 (JP, A) JP-A-55-73821 (JP, A ) Tokiko 56-5288 (JP, B2)
Claims (3)
う配管用軟質ないし半硬質りん脱酸銅管の製造方法にお
いて、抽伸加工した銅管の内部に水素ガスを導入して管
内雰囲気を水素ガスで置換した後、非酸化性または還元
性雰囲気中で焼鈍処理し、銅管内面の炭素質皮膜形成を
低減することを特徴とする耐冷水型孔食用銅管の製造方
法。1. A method for producing a soft or semi-hard phosphorous deoxidized copper pipe for piping in which an annealing treatment for tempering is performed after the drawing processing, wherein a hydrogen gas is introduced into the drawn copper pipe to reduce the atmosphere in the pipe. A method for producing a cold-water resistant pitting copper pipe, characterized by reducing the formation of a carbonaceous film on the inner surface of the copper pipe by performing an annealing treatment in a non-oxidizing or reducing atmosphere after replacing with hydrogen gas.
端を密封し、非酸化性または還元性雰囲気中で焼鈍処理
することを特徴とする請求項１記載の耐冷水型孔食用銅
管の製造方法。2. The cold water resistant pitting corrosion method according to claim 1, wherein after replacing the inside of the copper tube with hydrogen gas, both ends of the copper tube are sealed and annealed in a non-oxidizing or reducing atmosphere. Manufacturing method of copper tube.
で置換した後、非酸化性または還元性雰囲気中で焼鈍処
理することを特徴とする請求項１記載の耐冷水型孔食用
銅管の製造方法。3. The cold-water resistant pitting corrosion method according to claim 1, wherein after the inside of the coiled copper tube is replaced with hydrogen gas, annealing is performed in a non-oxidizing or reducing atmosphere. Manufacturing method of copper tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5139071A JP2701120B2 (en) | 1993-05-17 | 1993-05-17 | Manufacturing method of cold water resistant pitting copper tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5139071A JP2701120B2 (en) | 1993-05-17 | 1993-05-17 | Manufacturing method of cold water resistant pitting copper tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06330265A JPH06330265A (en) | 1994-11-29 |
| JP2701120B2 true JP2701120B2 (en) | 1998-01-21 |
Family
ID=15236819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5139071A Expired - Lifetime JP2701120B2 (en) | 1993-05-17 | 1993-05-17 | Manufacturing method of cold water resistant pitting copper tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2701120B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4970777B2 (en) * | 2005-12-06 | 2012-07-11 | 住友軽金属工業株式会社 | Lubricating oil for copper pipe processing and method for producing copper pipe using the same |
| JP4970778B2 (en) * | 2005-12-06 | 2012-07-11 | 住友軽金属工業株式会社 | Lubricating oil for copper pipe processing and method for producing copper pipe using the same |
| JP4970779B2 (en) * | 2005-12-06 | 2012-07-11 | 住友軽金属工業株式会社 | Lubricating oil for copper pipe processing and method for producing copper pipe using the same |
| JP2014118580A (en) * | 2012-12-13 | 2014-06-30 | Kobelco & Materials Copper Tube Inc | Corrosion resistant copper alloy tube |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5573821A (en) * | 1978-11-30 | 1980-06-03 | Nisshin Steel Co Ltd | Reducing method for oxidized scale of pipe inside surface |
| JPS565288A (en) * | 1979-06-25 | 1981-01-20 | Yamaha Motor Co Ltd | Structure for securing high outlook in small-sized vessel |
| JPH02250945A (en) * | 1989-03-24 | 1990-10-08 | Sumitomo Light Metal Ind Ltd | Manufacture of corrosion-resistant cupro nickel tube for heat exchanger |
-
1993
- 1993-05-17 JP JP5139071A patent/JP2701120B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06330265A (en) | 1994-11-29 |
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