KR19980077783A - Lead Free Grinding Brass Alloy - Google Patents
Lead Free Grinding Brass Alloy Download PDFInfo
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- KR19980077783A KR19980077783A KR1019970015025A KR19970015025A KR19980077783A KR 19980077783 A KR19980077783 A KR 19980077783A KR 1019970015025 A KR1019970015025 A KR 1019970015025A KR 19970015025 A KR19970015025 A KR 19970015025A KR 19980077783 A KR19980077783 A KR 19980077783A
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- 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
- C22C9/04—Alloys based on copper with zinc as the next major constituent
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- 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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Abstract
본 발명은 구리(Cu)-아연(Zn) 2원계 황동합금으로서, 구리(Cu) 57∼63중량%, 납(Pb) 0.05중량%이하, 철+주석(Fe+Sn) 1.0중량%이하, 기타 불순물 0.5중량%이하, 나머지 중량%가 아연(Zn)인 황동합금에 비스무트(Bi)를 0.5∼3.5중량% 첨가한 것을 기본조성으로 하는 무연쾌삭 황동합금에 관한 것이다.The present invention is a copper (Cu) -zinc (Zn) binary brass alloy, copper (Cu) 57-63% by weight, lead (Pb) 0.05% by weight or less, iron + tin (Fe + Sn) 1.0% by weight, It relates to a lead-free free-cut brass alloy based on the addition of 0.5-3.5% by weight of bismuth (Bi) to brass alloys containing 0.5% by weight or less of other impurities and the remaining weight% of zinc (Zn).
상기의 황동합금 중에 비스무트가 압출 및 인발되는 가공공정 중에 원형 혹은 타원형에 가까운 형상으로 입계와 입내에 균일하게 분포되고, 비스무트가 10㎛이하의 크기로 형성되는 무연쾌삭 황동합금을 특징으로 한다.In the brass alloy, bismuth is extruded and drawn in a process close to the round or oval shape in the grain boundary and the mouth evenly distributed, characterized in that the lead-free free-cut brass alloy is formed in a size of less than 10㎛.
이러한 무연쾌삭 황동합금은 인체에 무해하고, 비스무트의 크기가 일정하여 입계취성을 방지함으로써 기계적인 특성이 우수하며, 황동합금의 절삭성을 증가시키는 효과가 있다.The lead-free free-cut brass alloy is harmless to the human body, the size of bismuth is constant, thereby preventing intergranular brittleness, excellent mechanical properties, and has the effect of increasing the machinability of the brass alloy.
Description
본 발명은 구리(Cu)-아연(Zn) 이원계 황동(黃銅, brass)합금에 납(鉛, Pb)이 첨가되어 있지 않고, 소량의 비스무트(Bi)를 첨가하여, 인체에 무해하고 우수한 절삭성을 나타내는 무연쾌삭(無鉛快削) 황동합금에 관한 것이다.In the present invention, lead (Pb) is not added to a copper (Cu) -zinc (Zn) binary brass alloy, and a small amount of bismuth (Bi) is added, which is harmless to the human body and has excellent cutting properties. It relates to a lead-free free-cut brass alloy.
종래의 쾌삭황동은 황동합금에 납을 1.8∼4.5% 첨가하여 절삭성을 향상시킨, 이른바 납계(系) 쾌삭황동으로서 현재까지 가장 광범위하게 실용 쾌삭황동 소재로 사용되어 오고 있다. 그러나, 최근에 이러한 납계 쾌삭황동 소재로 제조된 음료용 연결부위의 배관설비 혹은 수도꼭지 등으로 사용할때, 황동합금에 분산되어 있는 유해한 납 성분이 음료수 중으로 용출됨에 따른 심각한 건강상의 문제점이 제기되고 있다.Conventional free cutting brass is a so-called lead-based free cutting brass which adds 1.8 to 4.5% of lead to brass alloy to improve machinability and has been used as the most practical free cutting brass material to date. However, recently, when used as a plumbing installation or a faucet of the beverage connection portion made of such a lead-based free cutting brass material, serious health problems have been raised as harmful lead components dispersed in the brass alloy is eluted into the beverage.
따라서 납계 쾌삭황동의 대체 재료로서 인체에 무해하면서도, 만족할 만한 절삭성을 나타내는 새로운 쾌삭황동 소재의 개발에 여러 연구자들의 관심이 모아지고 있다.Therefore, many researchers are drawing attention to the development of a new free-cut brass material which is harmless to the human body and shows satisfactory machinability as an alternative material for lead-based free-cut brass.
한편, 구리(Cu)-아연(Zn) 2원계 황동합금에 절삭성을 부여하는 첨가원소로서 텔루륨(Te)과 비스무트(Bi)가 일부 거론되고 있긴 하나, 이중에서 텔루륨(Te) 원소는 인체에 유해하므로 황동합금에 절삭성을 부여하는 첨가원소로서 적절하지 않다.On the other hand, although some of the tellurium (Te) and bismuth (Bi) are mentioned as addition elements for providing cutting property to the copper (Cu) -zinc (Zn) binary brass alloy, the tellurium (Te) element is a human body It is not suitable as an additive element to impart machinability to brass alloy because it is harmful to.
즉, 인체에 유해한 영향을 끼치지 않으면서, 기존의 납계 쾌삭황동의 절삭성에 필적할 만한 쾌삭황동이 요구되는 것이다.That is, a free cutting brass comparable to the machinability of existing lead-based free cutting brass is required without adversely affecting the human body.
본 발명은 종래의 납계 쾌삭황동이 지니고 있는 상기의 문제점을 해결하기 위한 것으로서, 인체에 무해하면서도 절삭성이 우수한 무연쾌삭 황동합금을 제공하는데에 그 목적을 둔다.The present invention is to solve the above problems with the conventional lead-based free-cut brass, and to provide a lead-free free-cut brass alloy harmless to the human body and excellent in machinability.
제 1 도는 본 발명의 무연쾌삭 황동합금의 주조조직의 주사전자 현미경(SEM) 사진1 is a scanning electron microscope (SEM) photograph of the cast structure of the lead-free free-cut brass alloy of the present invention
제 2 도는 본 발명의 무연쾌삭 황동합금의 압출 및 인발 후 조직의 주사전자 현미경(SEM) 사진2 is a scanning electron microscope (SEM) photograph of the tissue after extrusion and drawing of the lead-free free-cut brass alloy of the present invention.
위와 같은 목적을 달성하기 위한 본 발명의 특징은 구리(Cu) 57∼63중량%, 납(Pb) 0.05중량%이하, 철+주석(Fe+Sn) 1.0중량%이하, 기타 불순물 0.5중량%이하, 나머지 중량%가 아연(Zn)인 황동합금에 비스무트(Bi)를 0.5∼3.5중량% 첨가한 것을 특징으로 하는 무연쾌삭 황동합금에 있다.Features of the present invention for achieving the above object is copper (Cu) 57 ~ 63% by weight, lead (Pb) 0.05% by weight or less, iron + tin (Fe + Sn) 1.0% by weight, other impurities 0.5% by weight or less In the lead-free free-cut brass alloy, the remaining weight% of zinc (Zn) is added to the brass alloy bismuth (Bi) 0.5 to 3.5% by weight.
이 황동합금에서 비스무트(Bi)의 크기는 10㎛ 이하로서, 입계와 입내에 균일하게 분포하고, 그 형상은 원형 혹은 타원형에 가까운 형상으로 함이 바람직하다.In this brass alloy, bismuth (Bi) has a size of 10 µm or less, which is uniformly distributed in grain boundaries and in the mouth, and its shape is preferably round or oval.
특히, 무연쾌삭 황동합금의 절삭저항력은 종래의 쾌삭황동인 KS C3604 황동합금의 절삭저항력을 100%로 할 때, 70% 이상인 점에 그 특징이 있다.In particular, the cutting resistance of the lead-free free-cut brass alloy is characterized in that the cutting resistance of the conventional free-cut brass KS C3604 brass alloy is 70% or more.
일반적으로 황동합금에 비스무트가 첨가되면, 비스무트는 입계에 편중되어 취성을 일으키는 원인으로 작용하는 것으로 알려져 있으나, 아연(Zn)을 일정량 첨가하면 황동합금의 표면장력이 감소하여 비스무트가 입계 또는 입계의 삼중점(triple point)에 편중되지 않음은 물론 형상도 원형 혹은 타원형에 가까운 형상으로 존재한다.In general, when bismuth is added to the brass alloy, bismuth is known to act as a cause of brittleness due to the bias in the grain boundary, but when a certain amount of zinc (Zn) is added, the surface tension of the brass alloy decreases, so the bismuth is the triple point of the grain boundary or grain boundary. Not only is it not biased at the triple point, but the shape is also round or elliptical.
이하에서는 본 발명의 바람직한 실시예를, 첨부한 도면과 함께 상세히 설명하고자 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with the accompanying drawings.
본 발명의 비스무트계 쾌삭황동의 화학조성은 구리(Cu) 57∼63중량%, 납(Pb) 0.05중량%이하, 철+주석(Fe+Sn) 1.0중량%이하, 비스무트(Bi) 0.5∼3.5중량%, 기타 불순물 0.5중량%이하, 나머지의 중량%가 아연(Zn)이다.The chemical composition of the bismuth free abrasive brass of the present invention is 57 to 63% by weight of copper (Cu), 0.05% by weight of lead (Pb), 1.0% by weight of iron + tin (Fe + Sn) or less, and 0.5 to 3.5 of bismuth (Bi). % By weight, other impurities below 0.5% by weight and the remaining% by weight are zinc (Zn).
본 발명의 무연쾌삭 황동합금의 절삭성을 평가하기 위하여 표 1과 같은 조성이 되도록 용해 및 주조하여 시료을 제작하였다.In order to evaluate the machinability of the lead-free free-cut brass alloy of the present invention, a sample was prepared by melting and casting the composition as shown in Table 1.
표 1에서 시료번호 1번과 5번은 비교예로서 사용되었으며, 이중 시료번호 5번은 종래의 납계 쾌삭황동인 KS C3604 황동합금이다.In Table 1, Sample No. 1 and No. 5 were used as comparative examples, and Sample No. 5 is KS C3604 brass alloy, which is a conventional lead-based free cutting brass.
시료번호 2, 3 및 4는 비스무트 첨가량을 변화시킨 실시예이며, 시료번호 6, 7, 및 8은 비스무트 첨가량이 약 2.0중량% 첨가된 상태에서 구리 첨가량을 변화시킨 실시예이다.Sample Nos. 2, 3 and 4 are examples in which the bismuth addition amount was changed, and Sample Nos. 6, 7, and 8 are examples in which the copper addition amount was changed in the state in which the bismuth addition amount was added about 2.0% by weight.
본 발명의 무연쾌삭 황동합금의 실시예와 비교예는 대기중에서 용해 및 주조하여 제조하였다. 실시예 3의 주조조직은 제 1 도와같이 비스무트는 입계와 입내에 균일하게 분포한다. 이때 비스무트의 크기는 3∼10㎛로 원형 혹은 막대모양으로 형상이 불균일하지만 입계 혹은 입내에 편재되지 않고, 입계와 입내의 전부분에 균일하게 분포한다.Examples and comparative examples of the lead-free free-cut brass alloy of the present invention was prepared by melting and casting in the air. In the cast structure of Example 3, bismuth is uniformly distributed in grain boundaries and in the mouth as in the first degree. At this time, bismuth has a size of 3 to 10 µm, and the shape of the bismuth is circular or rod-shaped, but is unevenly distributed in the grain boundary or in the mouth, and is uniformly distributed in the grain boundary and all parts of the mouth.
이러한 주조조직은 압출 및 인발되는 가공공정을 거치면 제 2 도에 나타낸바와 같이 비스무트는 2∼7㎛의 크기로, 원형 혹은 타원형에 가까운 형상으로서 입계와 입내에 균일하게 분포시킬 수 있다.As shown in FIG. 2, the cast structure is subjected to a process of extrusion and drawing. As shown in FIG. 2, bismuth has a size of 2 to 7 μm, and can be uniformly distributed in grain boundaries and in the mouth as a shape close to a circular or elliptical shape.
즉, 제 2 도에서 알 수 있듯이 비스무트는 황동조직의 입계와 입내에 균일하게 분포하므로, 비스무트의 첨가로 인한 입계균열의 영향을 최소화시켜 취성을 방지할 수 있다. 따라서 비스무트의 균일한 분포로 인하여 기존의 연구자들이 우려한 입계편석으로 인한 취성의 원인이 제거될 수 있었다.That is, as shown in Figure 2, since bismuth is uniformly distributed in the grain boundary and the mouth of the brass structure, it is possible to prevent brittleness by minimizing the influence of the grain boundary crack due to the addition of bismuth. Therefore, due to the uniform distribution of bismuth, the cause of brittleness due to the intergranular segregation, which is concerned by existing researchers, can be eliminated.
절삭성 평가는 드릴과 선반을 이용할 수 있다. 절삭실험에서는 절삭저항력을 토크(torque)와 트러스트(thrust) 값으로 얻는다. 본 발명의 실시예 2, 3 및 4와 비교예 1 및 5의 절삭성 평가를 각각 드릴과 선반으로 실시하여, 그 결과를 표 2와 3에 나타내었다. 여기서 절삭저항값이 낮을수록 절삭성이 우수하다고 한다.Machinability evaluation can use a drill and a lathe. In cutting experiments, the cutting force is obtained from the torque and thrust values. The machinability evaluations of Examples 2, 3 and 4 and Comparative Examples 1 and 5 of the present invention were carried out with drills and lathes, respectively, and the results are shown in Tables 2 and 3. Here, the lower the cutting resistance value, the better the machinability.
표 2에는 본 발명의 비스무트계 무연쾌삭 황동합금 시료의 드릴절삭 때의 절삭저항력을 토크와 트러스트 값으로 나타내었다. 이 자료들은 Φ3.5의 고속도강(HSS, high speed steel, HSS) 드릴로, 절삭속도 1100rpm와 절삭깊이 10mm의 조건으로 실험한 결과이다.Table 2 shows the cutting resistance in the drill cutting of the bismuth-free lead-free brass alloy sample of the present invention in torque and trust values. These data are the result of experiments under the condition of cutting speed of 1100rpm and cutting depth of 10mm with a high speed steel (HSS) drill of Φ3.5.
표 2의 실험결과에서 알 수 있듯이 비스무트를 첨가하지 않은 비교예 1 황동합금을의 토크값은 0.62N.m이다. 비스무트가 0.83중량% 첨가된 실시예 2의 토크값은 0.39N.m, 1.85중량% 첨가된 실시예 3은 0.31N.m, 3.20중량% 첨가된 실시예 4는 0.29N.m로서, 비스무트 첨가량의 증가에 따라 토크값이 점차적으로 감소함을 알 수 있다. 또한 실시예 2, 3 및 4의 토크값을 비스무트가 첨가되지 않은 비교예 1과 비교해 볼때, 비스무트를 2.0중량% 정도 첨가하면 200%이상의 절삭성 향상효과를 얻을 수 있슴을 알 수 있다. 특히 2.0중량% 정도의 비스무트를 첨가했을 때의 토크값이 종래의 대표적인 납계 쾌삭황동으로 KS C3604 황동합금인 비교예 5의 토크값과 동등한 절삭저항값을 나타내었다.As can be seen from the experimental results of Table 2, the torque value of Comparative Example 1 brass alloy without bismuth was 0.62 N.m. The torque value of Example 2 with the addition of 0.83% by weight of bismuth was 0.39 Nm, the Example 3 with the addition of 1.85% by weight was 0.31 Nm, and the example 4 with the addition of 3.20% by weight was 0.29 Nm. It can be seen that this gradually decreases. In addition, when comparing the torque values of Examples 2, 3 and 4 with Comparative Example 1 without the addition of bismuth, it can be seen that the addition of about 2.0% by weight of bismuth improves the machinability improvement of 200% or more. In particular, when the bismuth of about 2.0% by weight was added, the torque value was a typical lead-based free cutting brass, and showed a cutting resistance value equivalent to that of Comparative Example 5 of KS C3604 brass alloy.
표 2의 트러스트값도 토크값의 경우와 같은 경향을 나타내었다. 비스무트의 첨가량이 0.83중량%에서 3.20중량%로 증가와 더불어 트러스트값이 감소되어, 비스무트를 3.20중량% 첨가했을 때의 트러스트값은 KS C3604인 종래의 납계 쾌삭황동의 트러스트값과 거의 동등한 수준의 절삭저항력으로 평가되었다.The trust value of Table 2 also showed the same tendency as the torque value. As the amount of bismuth added increased from 0.83% to 3.20% by weight, the trust value decreased, and the trust value when 3.20% by weight of bismuth was added is almost equivalent to that of conventional lead-based free-cut brass, KS C3604. It was evaluated for resistance.
또한 표 2에서 알 수 있듯이, 기존의 납계 쾌삭황동의 절삭성을 100%로 하였을 때, 비스무트가 첨가되지 않은 비교예 1의 절삭성은 약 50%로 매우 낮았으나, 비스무트의 첨가로 절삭성은 급격히 증가하여, 약 2.0중량% 이상의 비스무트가 첨가된 실시예 3과 4의 절삭성은 90% 이상을 나타내었다. 비스무트가 0.83중량%로 적게 첨가된 실시예 2의 경우에도 절삭성은 70% 이상을 나타내었다. 절삭성이 70%라는 것은 종래의 일반 단조황동의 절삭성과 동등하므로, 쾌삭황동으로서 평가될 수 있다.In addition, as shown in Table 2, when the machinability of the conventional lead-based free cutting brass was 100%, the machinability of Comparative Example 1, in which bismuth was not added, was very low at about 50%, but the machinability was sharply increased by the addition of bismuth. The machinability of Examples 3 and 4 with at least about 2.0% by weight of bismuth added was at least 90%. In the case of Example 2 in which bismuth was added as low as 0.83% by weight, the machinability was 70% or more. The machinability of 70% is equivalent to that of the conventional general forged brass, and thus can be evaluated as free cutting brass.
비스무트가 약 2.0중량% 첨가된 상태에서, 구리를 57∼63중량%로 변화시킨 실시예 6, 7 및 8의 절삭저항값은 표 2에 나타낸 실시예 3의 절삭실험 결과와 동등하였다. 즉, 비스무트 첨가량이 일정하고, 구리 첨가량이 57-63중량% 범위인 경우 구리의 첨가량에 크게 의존하지 않고, 동등한 절삭저항값을 나타냄을 알 수 있다.The cutting resistance values of Examples 6, 7, and 8 in which copper was changed to 57 to 63% by weight in the state where about 2.0% by weight of bismuth was added were the same as the cutting test results of Example 3 shown in Table 2. That is, when the bismuth addition amount is constant and the copper addition amount is in the range of 57-63% by weight, it can be seen that it does not depend greatly on the addition amount of copper and exhibits equivalent cutting resistance values.
본 발명의 무연쾌삭 황동합금의 절삭성을 기존의 쾌삭황동과 비교하기 위하여 선반으로서 절삭저항력을 평가하여 표 3에 나타내었다. 본 절삭실험 결과에서는 주절삭분력값으로만 평가하였다. 표 3의 자료들은 절삭깊이를 1.0mm, 1.5mm 및 2.0mm로 선정에서 실험한 결과로서, 절삭속도는 1010rpm으로 일정하게 하였다. 단, 절삭깊이가 1.5mm인 경우에는 1800rpm의 조건을 추가로 실험하여 비교하였다.In order to compare the machinability of the lead-free free-cut brass alloy of the present invention with conventional free-cut brass, cutting resistance was evaluated as a lathe and is shown in Table 3. In the results of this cutting experiment, only the main cutting component value was evaluated. The data in Table 3 are the results of experiments in selecting the cutting depths of 1.0mm, 1.5mm and 2.0mm, and the cutting speed was constant at 1010rpm. However, when the cutting depth is 1.5mm, the conditions of 1800rpm were further tested and compared.
표 3에서 알 수 있듯이, 비스무트를 첨가하지 않은 비교예 1을 절삭깊이 1.0mm, 절삭속도 1010rpm에서 선반절삭할때 절삭저항력은 617N이다. 비스무트가 0.83중량% 첨가된 실시예 2의 절삭저항력은 490N, 1.85중량% 첨가된 실시예 3은 391N, 3.20중량% 첨가된 실시예 4는 340N으로, 비스무트의 첨가량이 0.83중량%에서 3.20중량%로 증가함에 따라 절삭저항력이 감소함을 알 수 있다.As can be seen from Table 3, when cutting the lathe at Comparative depth 1 with a cutting depth of 1.0mm and a cutting speed of 1010rpm without adding bismuth, the cutting resistance is 617N. Cutting resistance of Example 2 with the addition of 0.83% by weight of bismuth was 490N, Example 3 with the addition of 1.85% by weight was 391N, and Example 4 with the addition of 3.20% by weight was 340N, and the amount of bismuth was 0.83% by weight to 3.20% by weight. It can be seen that the cutting force decreases with increasing.
비교예 1과 실시예 2, 3 및 4와 비교해 볼 때, 표 2의 드릴에 의한 실험결과에서와 유사하게, 비스무트 첨가에 의해 200% 이상의 절삭성 향상효과를 얻을 수 있었다. 또한 본 발명의 무연쾌삭 황동합금의 절삭저항력은 종래의 대표적인 쾌삭황동으로서 KS C3604인 비교예 5의 절삭저항력값과 거의 일치한다. 절삭깊이와 절삭속도를 달리하여 실험한 결과에서도, 절삭특성은 비스무트의 첨가에 따라 향상되어, 종래의 쾌삭황동과 대등한 특성을 나타냄을 알 수 있다.Compared with Comparative Example 1 and Examples 2, 3, and 4, similarly to the results of the drills shown in Table 2, the addition of bismuth improved the cutting property by 200% or more. In addition, the cutting resistance of the lead-free free cutting brass alloy of the present invention is almost the same as the cutting resistance value of Comparative Example 5 of KS C3604 as a typical representative free cutting brass. Even in the results of experiments with different cutting depths and cutting speeds, the cutting characteristics are improved with the addition of bismuth, and it can be seen that the characteristics are comparable with the conventional free cutting brass.
이와 같이 표 2와 3에서 알 수 있듯이, 구리(Cu) 57∼63중량%, 납(Pb) 0.05중량%이하, 철+주석(Fe+Sn) 1.0중량%이하, 기타 불순물 0.5중량%이하, 나머지 중량%가 아연(Zn)인 황동합금에 0.5∼3.5중량%의 비스무트를 첨가함으로써, 인체에 유해한 납(Pb)이 적어, 인체에 무해하고 기존의 쾌삭황동과 동등한 절삭성을 가진 무연쾌삭 황동합금이 제공될 수 있다.As can be seen from Tables 2 and 3, 57 to 63 wt% of copper (Cu), 0.05 wt% or less of lead (Pb), 1.0 wt% or less of iron + tin (Fe + Sn), 0.5 wt% or less of other impurities, By adding 0.5-3.5% by weight of bismuth to the brass alloy with the remaining weight% of zinc (Zn), there is less lead (Pb) which is harmful to the human body, which is harmless to the human body and has a machinability equivalent to that of free-cut brass. This may be provided.
상술한 바와 같은 본 발명의 무연쾌삭 황동합금은 구리(Cu) 57∼63중량%, 납(Pb) 0.05중량%이하, 철+주석(Fe+Sn) 1.0중량%이하, 비스무트(Bi) 0.5∼3.5중량%, 기타 불순물 0.5중량%이하, 나머지의 중량%가 아연(Zn)인 화학조성을 기본조성으로 이루어지고, 상기 황동합금 중 비스무트가 압출 및 인발되는 가공공정 중에 비스무트가 10㎛ 이하의 크기로, 원형 혹은 타원형에 가까운 형상으로 입계와 입내에 균일하게 분포되는 특징에 따라, 인체에 무해하고, 입계취성을 방지하여 기계적 특성이 우수하고, 절삭성이 우수한 무연쾌삭 황동합금을 제공하게 되는 효과가 있다.Lead-free free-cut brass alloy of the present invention as described above is 57 to 63% by weight of copper (Cu), 0.05% by weight or less of lead (Pb), 1.0% by weight or less of iron + tin (Fe + Sn), 0.5 to Bismuth (Bi) Chemical composition of 3.5% by weight, other impurities below 0.5% by weight, and the remaining weight% by weight of zinc (Zn) consists of basic composition. According to the feature of uniform distribution in the grain boundary and the mouth in the shape of round or oval shape, it is harmless to the human body and prevents grain brittleness, thereby providing the lead-free free-cut brass alloy with excellent mechanical properties and excellent cutting property. .
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| KR101581646B1 (en) * | 2015-09-23 | 2015-12-30 | (주)이오렉스 | Devices For Treating Water With Harmful Substance Free |
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| KR102245881B1 (en) | 2021-03-23 | 2021-04-29 | 서울대학교 산학협력단 | Brass fabricated with stainless steel scrap for water supplyuynt and manufacturing method for the same |
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| KR101581646B1 (en) * | 2015-09-23 | 2015-12-30 | (주)이오렉스 | Devices For Treating Water With Harmful Substance Free |
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