KR20030011995A - Heat Treatment Method for Phosphorus Bronze Copper Strip Slab - Google Patents

Heat Treatment Method for Phosphorus Bronze Copper Strip Slab Download PDF

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Publication number
KR20030011995A
KR20030011995A KR1020010045814A KR20010045814A KR20030011995A KR 20030011995 A KR20030011995 A KR 20030011995A KR 1020010045814 A KR1020010045814 A KR 1020010045814A KR 20010045814 A KR20010045814 A KR 20010045814A KR 20030011995 A KR20030011995 A KR 20030011995A
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South Korea
Prior art keywords
slab
heat treatment
temperature
cooling
treatment method
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KR1020010045814A
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Korean (ko)
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김형진
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창덕금속 주식회사
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Priority to KR1020010045814A priority Critical patent/KR20030011995A/en
Publication of KR20030011995A publication Critical patent/KR20030011995A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/045—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for horizontal casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/004—Copper alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/02—Alloys based on copper with tin as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)

Abstract

PURPOSE: A heat treatment method for phosphorus bronze slab is provided which not only minimizes process loss and working hours, but also improves quality of product by increasing rolling property as performing heat treatment, scalping and coiling operations of phosphorus bronze slab produced from continuous casting in one line process. CONSTITUTION: In a heat treatment method for phosphorus bronze slab continuously produced from horizontal continuous casting, the method for heat treating phosphorus bronze slab(100) comprises a heating process of rapidly high frequency heating phosphorus bronze slab containing 5 wt.% or more of tin (Sn) and having surface temperature of 100 to 150 deg.C obtained from the casting process to a temperature of 700 to 730 deg.C in a high frequency induction heater(16); a temperature maintenance process of maintaining temperature of the heating process for a certain period of time; and a cooling process of rapidly cooling the slab discharged to the outside in a cooling machine(18) by spraying water onto the slab after passing through the temperature maintenance process, wherein the temperature maintenance process is performed at a temperature of 700 to 730 deg.C for 18 to 25 minutes, the cooling process comprises the step of rapidly cooling the slab by spraying water onto a slab heated to a temperature of 700 to 730 deg.C for 1 to 2 minutes, and the high frequency induction heater for heat treating the phosphorus bronze slab is integrally installed in a horizontal continuous casting process line.

Description

인청동스래브 열처리방법{Heat Treatment Method for Phosphorus Bronze Copper Strip Slab}Heat Treatment Method for Phosphorus Bronze Copper Strip Slab}

본 발명은 전기·전자소재로 사용되는 인청동스래브를 고주파 열처리하는 방법에 관한 것으로서, 더욱 상세하게는 수평연속주조 후 배출되는 인청동 스래브가 열처리, 면삭, 감기작업이 하나의 라인공정으로 이루어지도록 하면서 압연성을 배양하여 공정손실 및 작업시간을 최소화하면서 제품의 질을 향상시키는 인청동스래브 열처리방법에 관한 것이다.The present invention relates to a method for high-frequency heat treatment of phosphor bronze slabs used as electrical and electronic materials, and more particularly, so that the phosphor bronze slabs discharged after horizontal continuous casting are heat treated, grounded, and wound in one line process. While cultivating rollability, the present invention relates to a phosphor bronze slab heat treatment method for improving product quality while minimizing process loss and working time.

일반적으로 인청동스래브는 수평연속주조에서 슬래브(Slab)형태로 배출되고,전연성, 내피로성, 내식성이 좋아 전자기기용 스위치나 리드프레임 등에 사용되고 있다.In general, phosphor bronze slabs are discharged in slab form from horizontal continuous casting, and are used in switches and lead frames for electronic devices because of their excellent malleability, fatigue resistance, and corrosion resistance.

이러한 종래의 인청동스래브는 수평연속주조로 스래브를 형성함과 동시에 스래브를 일정길이로 절단하고, 대차로 열처리작업(버너가열)을 행한 후 양면 면삭작업하고, 이어서 압연작업으로 공정을 완성하고 있다.The conventional phosphor bronze slab forms a slab by horizontal continuous casting and simultaneously cuts the slab to a certain length, performs a heat treatment operation (burner heating) on a large scale, and then double-sides the surface finishing work, and then completes the process by rolling. Doing.

이러한 작업공정은 연속공정이 되지 않고 별개로 각각 형성된 2개의 작업공정을 거쳐야하는 작업공정의 불편함이 있으며, 열처리조건은 대차위에 일정길이의 절단 스래브를 겹쳐 놓고 소정온도의 화로에 대차를 인입하여 경유버너에 의한 680℃에서 5시간 균질 열처리 후 자연냉각(5시간)시켜 면삭작업을 실시하고 있다.This work process is not a continuous process but has the inconvenience of a work process that has to go through two separate work processes, and the heat treatment condition is to superimpose a trolley of a predetermined temperature with a cutting slab of a certain length on the bogie. After the homogeneous heat treatment at 680 ° C. for 5 hours using a diesel oil burner, natural cooling (5 hours) was performed to perform the surface work.

그러나, 상기 종래의 인청도 스래브성형공정은 하나의 작업라인에서 연속작업이 되지 않아 적어도 하나이상의 작업라인을 통하여 2개의 공정으로 성형을 이루는 작업공수의 번거러움이 있으며, 또한 대차로 열처리는 소량 열처리가 곤란하고, 많은 량을 처리하려면 생산 대기 시간이 많이 걸리고, 냉각시간이 많이 소요되는 문제와, 주석 함유량이 5%이상일 때 열처리가 되지 않는 제품은 주석의 편석으로 크랙이 발생되어 사용할 수 없는 문제점이 있었다.However, the conventional phosphorus slab molding process is not a continuous operation in one work line, there is a hassle of work maneuvering to form two processes through at least one work line, and also a heat treatment for a small amount of heat treatment It is difficult, and it takes a long time to wait for a large amount of processing, takes a long time to cool down, and a product that is not heat treated when the tin content is 5% or more cannot be used due to cracks due to segregation of tin. There was this.

본 발명은 이와 같은 종래의 문제점을 해결하기 위하여 안출된 것으로서, 인청동 슬래브 주조에서부터 열처리, 면삭, 감기작업의 각개 분할공정을 일원화하여 운용함으로써 공정손실 및 작업시간을 최소화하고, 고주파열처리에 의한 공정으로 압연성을 증대하여 제품의 질을 향상시키는 인청동스래브 열처리방법을 제공하는데있다.The present invention has been made in order to solve such a conventional problem, by minimizing the process loss and working time by unifying the operation of each division process of phosphor bronze slab casting, heat treatment, grinding, winding work as a process by high frequency heat treatment, It is to provide a phosphor bronze slab heat treatment method to improve the quality of the product by increasing the rolling properties.

상기 목적은, 본 발명에 따라, 수평연속주조에서 연속 생산되는 인청동스래브의 열처리방법에 있어서, 상기 주조공정에서 얻어진 주석함유량이 5%이상이며 표면온도가 100℃~150℃인 인청동스래브를 고주파 유도가열기에서 700℃~730℃로 고주파 급가열하는 가열공정과, 상기 가열공정의 동일온도에서 일정시간동안 유지시키는 온도유지공정과, 상기 온도유지공정을 거친 후 외부로 배출되는 스래브를 냉각수분사로 급냉시키는 냉각공정을 포함한다.According to the present invention, in the heat treatment method of the phosphor bronze slab continuously produced in horizontal continuous casting, the tin content obtained in the casting step is 5% or more and the phosphorus bronze slab having a surface temperature of 100 ℃ ~ 150 ℃ The high frequency induction heating in the high frequency induction heater 700 ~ 730 ℃ heating step, the temperature maintenance process for maintaining for a certain time at the same temperature of the heating process, and the slab discharged to the outside after the temperature maintenance process And a cooling step of quenching by cooling water injection.

본 발명의 상기 온도유지공정은 700℃~730℃에서 18~25분 동안 유지시키는 것을 특징으로 한다.The temperature maintaining process of the present invention is characterized by maintaining for 18 to 25 minutes at 700 ℃ ~ 730 ℃.

본 발명의 상기 냉각공정은 700℃~730℃로 가열된 스래브를 냉각수를 1~2분 동안 분사하여 급냉시킴을 특징으로 한다.The cooling process of the present invention is characterized by quenching the slab heated to 700 ℃ ~ 730 ℃ by spraying the cooling water for 1-2 minutes.

본 발명의 상기 인청동스래브를 열처리하는 고주파 유도가열기는 수평연속주조공정라인에 일체적으로 설치된 것을 특징으로 한다.The high frequency induction heater for heat-treating the phosphor bronze slab of the present invention is characterized in that it is integrally installed in the horizontal continuous casting process line.

도 1은 본 발명의 열처리공정이 적용된 수평연속주조라인의 정면도이다.1 is a front view of a horizontal continuous casting line to which the heat treatment process of the present invention is applied.

〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

10 ; 전기유도용해로12 ; 보온로10; Electric induction melting furnace 12; A thermal furnace

14 ; 인출기16 ; 고주파유도가열기14; Withdrawal machine 16; High frequency induction heater

18 ; 냉각기20 ; 양면면삭기18; Cooler 20; Duplex face cutter

22 ; 코일러22; Coiler

이하, 본 발명을 첨부된 도면을 참조하여 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

도 1은 본 발명의 열처리공정이 적용된 수평연속 주조라인을 정면도로 도시하고 있다.1 is a front view showing a horizontal continuous casting line to which the heat treatment process of the present invention is applied.

도 1에 도시된 바와 같이 본 발명의 인청동스래브 열처리방법은 소정의 온도에서 인청동을 스래브로 형상화하기 위해 소정의 인청동을 수용하여 용해하는 전기유도용해로(10)가 설치되고 그 전기유도용해로(10)의 일측에는 용해된 소정의 주조물이 소정범위로 보온하기 위한 보온로(12)가 설치되어 있으며, 상기 보온로(12)의 일측에는 인출되는 주조물이 인장가공되어 하나의 스래브(100)를 형성하는 인출기(14)가 설치되어 있다.As shown in FIG. 1, the phosphor bronze slab heat treatment method of the present invention is provided with an electro-induction melting furnace 10 for receiving and dissolving a predetermined phosphor bronze to form phosphor bronze at a predetermined temperature into a slab. On one side of 10) is provided an insulating furnace 12 for warming a predetermined casting dissolved in a predetermined range, one side of the heating furnace 12 is a cast to be drawn is pulled out one slab (100) A drawer 14 is formed to form a.

또한 상기 인출기(14)의 일측에 설치되고 인출기(14)에서 인출되는 스래브(100)를 소정온도에서 고주파열처리하는 고주파유도가열기(16)가 배치되어 있으며, 상기 고주파유도가열기(16)를 통하여 고주파유도가열된 스래브(100)가 소정온도로 소정범위를 유지한 후 냉각수로 급냉을 이루게 하는 냉각기(18)를 통하여 담금질된 스래브(100)의 양면에 불균형입자로 이루어지는 부위를 제거하기 위하여 양면연삭이 가능한 양면면삭기(20)와, 양면면삭이 완료된 스래브(100-1)가 소정의 범위로 감겨지는 코일러(22)로 구성되어 있다.In addition, a high frequency induction heater 16 is installed at one side of the drawer 14 and performs high frequency heat treatment of the slab 100 drawn from the drawer 14 at a predetermined temperature, and the high frequency induction heater 16 is disposed. After the high-frequency induction-heated slab 100 maintains a predetermined range at a predetermined temperature, a portion formed of unbalanced particles is removed on both sides of the quenched slab 100 through a cooler 18 for quenching with cooling water. In order to achieve this, a double-sided surface grinding machine 20 capable of double-sided grinding and a coiler 22 in which the double-sided surface-completed slab 100-1 is wound in a predetermined range are constituted.

여기서 상기 전기유도용해로(10)와 보온로(12), 인출기(14), 양면면삭기(20), 코일러(22) 등은 종래의 기술과 동일하므로 이에 대한 구체적인 구조나 설명은 생략한다.Here, the electric induction melting furnace 10, the insulating furnace 12, the drawer 14, the double-sided face grinder 20, the coiler 22 and the like are the same as the prior art, so the detailed structure or description thereof will be omitted.

열처리유도가열기(16)는 인출기(14)로부터 주석함유량이 5%이상이며 표면온도가 100℃~150℃인 스래브(100;인청동)를 700℃~730℃로 고주파 급가열한 후 동일온도에서 18~25분간 유지한 후 가열된 상태로 배출되어 급냉을 이룬다.Heat treatment induction heater 16 is the same temperature after the high-frequency rapid heating of the slab (100 (phosphor bronze)) having a tin content of more than 5% from the extractor 14 and the surface temperature of 100 ℃ ~ 150 ℃ to 700 ℃ ~ 730 ℃ After holding for 18 to 25 minutes in a heated state is discharged to form a quench.

냉각기(18)는 고주파유도가열기(16)에서 가열된 스래브(100)를 수용하여 냉각수를 1~2분간 분사하여 급냉시켜 표면을 탈 스테일시켜서 양면 면삭을 실시한 후 코일러(22)로 적당량 감아 절단 후 압연공정으로 보내게 된다.The cooler 18 accommodates the slab 100 heated by the high frequency induction heater 16, quenchs the cooling water for 1 to 2 minutes, quenchs the surface, destains the surface, and performs a double-sided surface machining. After cutting, it is sent to the rolling process.

한편 상기 인청동스래브(100)를 열처리하는 고주파 유도가열기(16)는 수평연속주조공정라인에 일체적으로 설치되어 하나의 라인에서 주조는 물론 열처리를 수행할 수 있도록 한다.On the other hand, the high-frequency induction heater 16 for heat-treating the phosphor bronze slab 100 is integrally installed in the horizontal continuous casting process line to perform the heat treatment as well as casting in one line.

가열공정 후 온도유지공정에서 스래브(100;인청동)를 700℃~730℃로 고주파 급가열한 후 동일온도에서 18~25분간 유지시키는 이유는 상기의 주석함유량이 5%이상 함유된 인청동스래브의 열팽창율이 인청동의 기지조직을 이루는 성분과 다르기 때문에 상기 온도의 범주에서 시간을 유지시키므로서 재질의 균일화를 이루어 내기 위한 것이며, 상기의 시간보다 적은 유지시간을 적용할 경우는 요구되어지는 재질의 균일화를 이루어 낼 수 없으므로 상기의 온도에서 열처리하는 과정에서 균열과 변형이 발생할 수 있으며, 상기 시간보다 많은 유지시간을 적용할 경우는 재질의 균일화는 이룰 수 있으나 열처리공정에 소요되어지는 시간이 길어지게 되면 비경제적이므로 가장 최적의 유지시간은 20분 내외로 하여야 한다.The reason why the slab (100; phosphor bronze) is maintained at 700 ° C to 730 ° C for 18 to 25 minutes at the same temperature after the heating step is maintained at the same temperature is phosphor bronze slab containing 5% or more of the tin content. Since the thermal expansion rate of is different from the components forming the matrix of phosphor bronze, it is to achieve the uniformity of the material by maintaining the time in the above temperature range, and when applying the holding time less than the above time, Since it is not possible to achieve uniformity, cracks and deformation may occur during the heat treatment at the above temperature, and when a holding time longer than the above time is applied, the material may be homogenized, but the time required for the heat treatment process becomes longer. Since it is uneconomical, the optimal holding time should be around 20 minutes.

또한 냉각공정은 공냉이나 유냉(기름냉각)에 의한 냉각방식의 경우 뚜렷한 조직의 성질의 개선효과는 얻어 낼 수 있으나, 일반적인 수냉방식의 경우 급격한 냉각에 의한 표면을 탈스케일 시켜 양면면삭이 가능하기 때문에 수냉하는 방법을 사용하고, 냉각수를 1~2분 동안 분사하면 양면면삭이 가능할 정도의 탈스케일이 일어나기 때문에 작업성이 좋아지나, 냉각시간이 상기 시간보다 지연되면 스래브조직 성질의 개선효과를 얻어내기 힘들어지게 된다.In addition, in the cooling process by air cooling or oil cooling (oil cooling), it is possible to obtain a distinctive improvement in the properties of the structure. Using water-cooling method and spraying coolant for 1 ~ 2 minutes, descaling is possible enough to make double-sided surface, and workability is improved, but if cooling time is delayed, the slab structure property is improved. It will be hard to bet.

[실시예]EXAMPLE

5%이상의 Sn이 함유된 인청동 스래브는 균질황 열처리 처리가 되지 않으면 압연시 깨어짐이 생겨 제품으로 사용할 수 없다. 따라서 연속 주조에서 인출되는잠열(150℃~200℃)을 함유하는 스래브를 단시간에 고주파유도가열기로 700℃가 될수 있게 급가열하고 제품의 심부까지 동일온도인 700℃로 20분간 유지한 후 급냉각함으로써 타생산 공정보다 3일정도의 공정시간을 단축하고, 연속주조에 인출되는 스래브의 200℃의 잠열을 사용하여 가열함으로써 50KW/Hr 정도의 에너지 절약효과를 얻을 수 있었다. 또한 설비가 간단하여 좁은 장소등에도 설치가 가능하고, 편석에 의한 깨어짐이 없고, 압성이 10%정도 향상되었다.Phosphor bronze slab containing 5% Sn or more cannot be used as a product due to cracking during rolling unless it is subjected to homogeneous sulfur heat treatment. Therefore, the slab containing latent heat (150 ℃ ~ 200 ℃) drawn from continuous casting is rapidly heated to be 700 ℃ with high frequency induction heater in a short time, and the core of the product is kept at 700 ℃ which is the same temperature for 20 minutes. By quenching, the process time of about 3 days was shortened compared to other production processes, and the energy saving effect of about 50 KW / Hr was obtained by heating using the latent heat of 200 ° C. of the slab drawn out in continuous casting. In addition, the facility is simple, so it can be installed in a narrow place, without cracking due to segregation, and the pressure is improved by about 10%.

이상과 같이, 본 발명은 설비가 간단하고 단시간에 2개의 공정을 하나의 공정으로 작업을 함으로써 각개 공정에서 발생하는 관리, 시간과 열손실등의 공정손실을 줄일 수 있고, 급가열 및 급냉함으로써 공정시간을 단축함과 동시에 압연성이 좋아지고, 대차로에 의한 열처리보다 열처리비용이 적으면서 원가절감을 이루는 효과가 있다.As described above, the present invention can reduce the process loss such as management, time and heat loss generated in each process by operating the two processes in one process in a simple and short time, and the process by rapid heating and quenching At the same time, the rollability is improved, and the heat treatment cost is less than the heat treatment by the bogie road, and the cost is reduced.

Claims (4)

수평연속주조에서 연속 생산되는 인청동스래브의 열처리방법에 있어서,In the heat treatment method of phosphor bronze slab continuously produced in horizontal continuous casting, 상기 주조공정에서 얻어진 주석함유량이 5%이상이며 표면온도가 100℃~150℃인 인청동스래브를 고주파 유도가열기에서 700℃~730℃로 고주파 급가열하는 가열공정과;A heating step of heating the phosphor bronze slab having a tin content of 5% or more and a surface temperature of 100 ° C. to 150 ° C. at a high frequency induction heater at 700 ° C. to 730 ° C .; 상기 가열공정의 동일온도에서 일정시간동안 유지시키는 온도유지공정과;A temperature maintaining step of maintaining the same temperature at the same temperature in the heating step for a predetermined time; 상기 온도유지공정을 거친 후 외부로 배출되는 스래브를 냉각수분사로 급냉시키는 냉각공정을 포함하여 이루어짐을 특징으로 하는 인청동스래브 열처리방법.Phosphor bronze slab heat treatment method characterized in that it comprises a cooling step of quenching the slab discharged to the outside after the temperature maintenance process with a cooling water spray. 제 1 항에 있어서;The method of claim 1; 상기 온도유지공정은 700℃~730℃에서 18~25분 동안 유지시키는 것을 특징으로 하는 인청동스래브 열처리방법.The temperature maintaining process is a phosphor bronze slab heat treatment method characterized in that for 18 to 25 minutes to maintain at 700 ℃ ~ 730 ℃. 제 1 항에 있어서;The method of claim 1; 상기 냉각공정은 700℃~730℃로 가열된 스래브를 냉각수를 1~2분 동안 분사하여 급냉시킴을 특징으로 하는 인청동스래브 열처리방법.The cooling process is a phosphor bronze slab heat treatment method characterized in that the cooling by spraying the cooling water for 1 to 2 minutes the slab heated to 700 ℃ ~ 730 ℃. 제 1 항에 있어서;The method of claim 1; 상기 인청동스래브를 열처리하는 고주파 유도가열기는 수평연속주조공정라인에 일체적으로 설치된 것을 특징으로 하는 인청동스래브 열처리방법.The high-frequency induction heater for heat-treating the phosphor bronze slab is a phosphor bronze slab heat treatment method characterized in that the integrally installed in the horizontal continuous casting process line.
KR1020010045814A 2001-07-30 2001-07-30 Heat Treatment Method for Phosphorus Bronze Copper Strip Slab KR20030011995A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01306246A (en) * 1988-06-03 1989-12-11 Dainippon Printing Co Ltd Printing condition setting system for offset rotary press
JPH02267247A (en) * 1989-04-05 1990-11-01 Furukawa Electric Co Ltd:The Continuous production of phosphor bronze stock
JPH03267356A (en) * 1990-03-19 1991-11-28 Furukawa Electric Co Ltd:The Production of sheet and bar of high-sn phosphor bronze

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01306246A (en) * 1988-06-03 1989-12-11 Dainippon Printing Co Ltd Printing condition setting system for offset rotary press
JPH02267247A (en) * 1989-04-05 1990-11-01 Furukawa Electric Co Ltd:The Continuous production of phosphor bronze stock
JPH03267356A (en) * 1990-03-19 1991-11-28 Furukawa Electric Co Ltd:The Production of sheet and bar of high-sn phosphor bronze

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