JP6008159B2 - Low lead brass without bismuth and silicon - Google Patents

Description

  The present invention relates to a low lead brass alloy, and more particularly to a brass alloy material having both ease of cutting and prevention of dezincing.

  Generally, brass for processing is one in which zinc metal is added at a rate of 38-42%. In order to improve the workability of brass, the strength and workability are improved by adding 2-3% lead to brass. Lead-containing brass is widely used for machined parts of various shapes with excellent formability (manufacturability of products of various shapes), machinability and wear resistance, and has a relatively large proportion in the copper industry. It is an important basic material that is recognized worldwide. However, lead-containing brass tends to generate a phenomenon in which lead is eluted in the form of solid or gas during production or use. According to medical research, lead can cause significant damage to the human hematopoiesis and nervous system, especially the kidneys and other organs of children. Contamination and damage caused by lead are regarded as important in countries around the world, and the allowable amount of lead element is designated as 0.25% or less by the National Sanitation Foundation (NSF). In addition, the EU (European Union) Restriction of Hazardous Substances Directive (RoHS) and the like include regulations that regulate and prohibit the use of high lead content brass.

In addition, when the zinc content in brass exceeds 20 wt%, corrosion phenomenon of dezincification is likely to occur, particularly in an environment where the brass comes into contact with high chloride ions, for example, in a seawater environment, The occurrence of the dezincification corrosion phenomenon can be accelerated. The dezincing action seriously damages the structure of the brass alloy, lowers the strength of the surface layer of the brass product, and also leads to the perforation of the brass pipe, greatly increasing the service life of the brass product Reduced and caused application problems.

Therefore, in order to solve the above-mentioned problems, the casting performance, forgeability, machinability, corrosion resistance, and mechanical properties should be arranged side by side in place of high lead-containing brass and achieving dezincification corrosion prevention. There is a need to provide a method of alloying that can be used.

  As can be seen from the prior art, silicon may be present in the form of a γ phase in the microstructure of the alloy (sometimes k phase). At this time, silicon can replace the action of lead in the alloy to some extent, and improves the machinability of the alloy. The machinability of the alloy improves as the silicon content increases, but since silicon has a high melting point, low specific gravity, and is easy to oxidize, when silicon monomer is added into the furnace during the alloy melting process, It floats on the surface of the alloy and is oxidized when the alloy melts to form silicon oxide or other oxides, making it difficult to produce a copper alloy containing silicon. If silicon is added in the form of a Cu-Si alloy, it is economical. Cost is relatively high.

  By the way, when bismuth is added instead of lead, a cutting interruption point can be formed in the alloy structure and the machinability can be improved. However, if the bismuth content is too high, thermal cracking occurs during forging. It was easy and disadvantageous for production.

  Accordingly, an object of the present invention is a brass alloy excellent in performance such as tensile strength, elongation rate, dezincification preventing property and machinability, and is a machined product and a forged product that require high strength and wear resistance. Another object of the present invention is to provide a brass alloy that is suitable for use as a constituent material for castings and castings. Thus, the demand for restrictions on lead-containing products that lead to the development of human society can be satisfactorily substituted for alloy copper containing a large amount of lead.

  In order to achieve the above-mentioned object, the following low lead brass alloy not containing bismuth and silicon is proposed.

  A low lead brass alloy (hereinafter abbreviated as Invention 1) that does not contain bismuth and silicon and has excellent machinability is composed of 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, and the remaining amount of zinc.

In the present invention 1, after the lead content is lowered to 0.1-0.25 wt%, the copper content is controlled to 60-65 wt%, and a small amount of aluminum and tin are added to cut the alloy. Improve sex. The microstructure of the alloy mainly includes α-phase, β-phase, γ-phase, and soft and brittle intermetallic compounds distributed within grain boundaries or grains, of which copper and zinc are the main components of brass alloys. Configure.

Adding tin to the alloy can improve the machinability of the alloy by forming a γ phase. In addition, the addition of tin significantly increases the strength of the alloy, improves its plasticity, and enhances the corrosion resistance. However, considering that the cost increases when tin is added, adding tin as well as adding aluminum improves the machinability of the alloy as well as alloy strength, wear resistance, and casting fluidity. And high temperature oxidation resistance can also be improved. In order to better exhibit the above-described action, the contents of tin and aluminum are 0.05-0.5 wt% and 0.1-0.7 wt%, respectively.

  A low lead brass alloy that does not contain bismuth and silicon and has excellent machinability (hereinafter abbreviated as invention 2) is composed of 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, 0.05-0.5 wt% manganese and / or 0.05-0.3 wt% Contains phosphorus and the remaining amount of zinc.

In comparison, Invention 2 further adds 0.05-0.3 wt% phosphorus and / or 0.05-0.5 wt% manganese on the basis of Invention 1. Phosphorus cannot form a γ phase, but has a function of improving the distribution of the γ phase, and therefore improves the machinability of the alloy. At the same time, the γ phase to which phosphorus is added disperses the main α phase crystal grains and improves the casting performance and corrosion resistance of the alloy. When the phosphorus content is lower than 0.05 wt%, the effect cannot be exerted, but when it is higher than 0.3 wt%, the casting performance and corrosion resistance of the alloy are lowered. However, the addition of manganese serves to enhance the dezincification performance of the alloy and the casting fluidity. When the manganese content is lower than 0.05 wt%, the effect cannot be exhibited effectively, but when it is 0.5 wt%, the effect reaches the saturation value.

A low-lead brass alloy that does not contain bismuth and silicon and has excellent machinability (hereinafter abbreviated as invention 3) includes 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus of the total weight of the brass alloy, 0.05- One or more elements selected from 0.5 wt% manganese and 0.001-0.01 wt% boron and the balance zinc.

Invention 3 can further add a small amount of boron on the basis of Invention 2 to better suppress the dezincing of the alloy and enhance its mechanical strength, while at the same time suboxidizing the surface of the copper alloy It is possible to modify the defect structure of the copper film, to make the cuprous oxide film more uniform and dense, and to improve the contamination resistance. When the boron content is lower than 0.001 wt%, the above-described effects cannot be exhibited. However, when the boron content is higher than 0.01 wt%, the above-described performance cannot be further improved. The preferable content of is 0.001-0.01 wt%. The ranges of the contents of phosphorus and manganese are the same as those of Invention 2, and the reason is the same as that described for Invention 2.

A low lead brass alloy that does not contain bismuth and silicon and has excellent machinability (hereinafter abbreviated as invention 4) is composed of 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, and 0.05-0.5 wt% manganese And 0.001-0.01 wt% boron and the remaining amount of zinc.

As described above, the action of lead, aluminum, tin, phosphorus, manganese and boron elements in the brass alloy has already been explained. By simultaneously adding these elements into the brass alloy, the mechanical performance of the alloy can be improved. It is possible to meet the demand for products with high needs.

A low-lead brass alloy that does not contain bismuth and silicon and has excellent machinability (hereinafter abbreviated as invention 5) comprises 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, and 0.05-0.5 wt% manganese And 0.001-0.01 wt% boron, the remaining amount of zinc and unavoidable impurities, said impurities being 0.25 wt% or less of nickel and / or 0.15 wt% of the total weight of the brass alloy % Chromium or less and / or 0.25 wt% iron or less.

Invention 5 contains on the basis of Invention 4 some inevitable impurities, namely mechanical impurities, nickel and / or chromium and / or iron.

A low lead brass alloy that does not contain bismuth and silicon and has excellent machinability (hereinafter abbreviated as invention 6) is composed of 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, and 0.05-0.5 wt% manganese And 0.001-0.01 wt% boron and the remaining amount of zinc, the total content of the aluminum, tin, phosphorus, manganese and boron does not exceed 2 wt% of the total weight of the brass alloy .

A low lead brass alloy that does not contain bismuth and silicon and is excellent in machinability (hereinafter abbreviated as invention 7) comprises 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, and 0.05-0.5 wt% manganese And 0.001-0.01 wt% boron and the remaining amount of zinc, the total content of the aluminum, tin, phosphorus, manganese and boron is 0.2-2 wt of the total weight of the brass alloy %.

A low lead brass alloy that does not contain bismuth and silicon and has excellent machinability (hereinafter abbreviated as invention 8) is composed of 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, 0.05-0. Two or more elements selected from 5 wt% manganese and 0.001 to 0.01 wt% boron and the remaining amount of zinc.

Among them, the presence / absence of addition of aluminum, tin, phosphorus, manganese and / or boron is selected according to the level of cutting requirements of different products, and the content range is the same as that of the invention 3. The reason is the same as that described for Invention 3.

A low lead brass alloy that does not contain bismuth and silicon and has excellent machinability (hereinafter abbreviated as invention 9) is composed of 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, 0.05-0. Two or more elements selected from 5 wt% manganese and 0.001 to 0.01 wt% boron, and a balance of zinc and inevitable impurities, the impurities being 0% of the total weight of the brass alloy. .25 wt% or less nickel and / or 0.15 wt% or less chromium and / or 0.25 wt% or less iron.

Invention 9 comprises on the basis of Invention 8 some inevitable impurities, namely mechanical impurities, nickel and / or chromium and / or iron.

A low lead brass alloy that does not contain bismuth and silicon and has excellent machinability (hereinafter abbreviated as invention 10) is composed of 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, and the remaining amount of zinc.

The range of the content of phosphorus in Invention 10 and its action are consistent with Invention 2. Phosphorus cannot form a γ phase, but has a function of improving the distribution of the γ phase. At the same time, the γ phase to which phosphorus is added disperses the main α phase crystal grains and improves the casting performance and corrosion resistance of the alloy. Therefore, even if there is no aluminum, the demand for machinability in the normal production situation can be satisfied.

A low lead brass alloy that does not contain bismuth and silicon and has excellent machinability (hereinafter abbreviated as invention 11) is composed of 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, 0.1-0.7 wt% aluminum of the total weight of the brass alloy, 0.05- Two or more elements selected from 0.5 wt% manganese and 0.001 to 0.01 wt% boron, and the remaining amount of zinc.

Among them, the presence or absence of the addition of aluminum, manganese and / or boron is selected according to the level of cutting requirements of different products, and the range of the content is consistent with the invention 3, the reason Is the same as that described for invention 3.

A low lead brass alloy that does not contain bismuth and silicon and has excellent machinability (hereinafter abbreviated as invention 12) is composed of 60-65 wt% copper and 0.1-0.25 wt% of the total weight of the brass alloy. Lead, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, 0.1-0.7 wt% aluminum of the total weight of the brass alloy, 0.05- Two or more elements selected from 0.5 wt% manganese and 0.001 to 0.01 wt% boron, and a residual amount of zinc and inevitable impurities, the impurities being the total weight of the brass alloy 0.25 wt% or less of nickel and / or 0.15 wt% or less of chromium and / or 0.25 wt% or less of iron.

The invention 12 comprises on the basis of the invention 11 some inevitable impurities, namely mechanical impurities, nickel and / or chromium and / or iron.

The present invention further provides a method for producing a brass alloy including the following steps, taking the invention 3 as an example.

1. Providing copper and manganese, raising the temperature to 1000-1050 ° C., and forming a copper manganese alloy solution with the copper and the manganese;
2. Lowering the temperature of the copper-manganese alloy solution to 950-1000 ° C.,
3. Cover the surface of the copper-manganese alloy solution with a glass glaze agent,
4). Adding zinc to the copper manganese alloy solution to form a copper manganese zinc solution;
5. The copper manganese zinc solution is stripped, and lead, aluminum, and tin are added to the brass alloy material solution to form a metal solution.
6). The temperature of the metal solution is raised to 1000-1050 ° C., and a boron copper alloy and a phosphor copper alloy are added to form a low lead brass alloy solution containing no bismuth and silicon.
7). The brass alloy solution is poured out and cast to form the brass alloy material.

Preferably, in the manufacturing method, providing the copper-manganese alloy is a providing source of elements of copper and manganese.

Preferably, in the manufacturing method, the melting furnace used is a high-frequency melting furnace, and a graphite crucible is used as a furnace lining in the high-frequency melting furnace.

A high-frequency melting furnace has characteristics such as a high melting rate, a fast temperature rise, cleanliness and no contamination, and self-stirring during the melting process (that is, affected by magnetic field lines).

The low lead brass alloy containing no bismuth and silicon described in the present invention is produced through a high-frequency melting furnace after adding various different materials at a certain ratio, and has a machining performance equivalent to a known lead-containing brass. And excellent tensile strength, elongation rate, dezincification-preventing property, and low lead content. As an alloy material that replaces the known lead-containing brass, it is suitable for use in the manufacture of products such as faucets, spare parts for toilets and bathroom products, for example.

It is a flowchart of the manufacturing method of the invention 3.

  In order to more clearly explain the technical aspects of the present invention, the techniques of the present invention will be described below through examples.

  The scope of the invention is not limited to the exemplary embodiments described above. Modifications and additions to the features of the invention described herein, as well as other applications of the principles of the invention described herein, may be conceived by those skilled in the art and those skilled in the art. Should be considered in scope.

  In the description of numerical values of the present invention, “above” and “below” both include numerical values themselves.

  The dezincification corrosion prevention performance test referred to in the present specification was performed based on the AS-2345-2006 standard in the form of a cast state. Add 12.8 g of copper chloride to the deionized water of C, and leave the sample in it for 24 hours to measure the dezincing depth. A represents that the dezincing depth is smaller than 100 μm, o represents that the dezincing depth is between 100 μm and 200 μm, and x represents that the dezincing depth is larger than 200 μm. .

The cutting performance test referred to in this specification is carried out at the same cutting speed and the same supply rate by adopting the same cutter in the form of a cast state, and the cutting speed is 25 m / min (meter / minute). The amount is 0.2 mm / r (millimeter / number of blades), the cutting depth is 0.5 mm, the diameter of the test bar is 20 mm, and the cutting resistance is measured with reference to C36000 alloy material. Thus, the relative cutting rate is obtained.

Relative cutting rate = cutting resistance of C36000 alloy material / cutting resistance of sample.

“◎” indicates that the relative cutting rate is greater than 85%, and “◯” indicates that the relative cutting rate is greater than 70%.

In the tests of tensile strength and elongation described in this specification, the tensile test is performed at room temperature in the form of a cast state. Elongation rate, that is, the percentage of the ratio between the total deformation ΔL of the portion of the gauge distance after tensile fracture of the sample and the length L of the original gauge distance is δ = ΔL / L × 100%. The contrast sample is lead-containing brass in the same state and the same standard, that is, C36000 alloy.

The distribution ratio of the measured components of the C36000 alloy material is as follows, and the unit is weight percent (wt%).

FIG. 1 is a flowchart of a manufacturing method of the invention 3, and includes the following steps.

  Step S100: Provide copper and manganese. In this step, providing the copper-manganese alloy can be a source for providing the elements of copper and manganese.

Step S102: The copper manganese mother alloy is heated, the temperature is raised between 1000-1050 ° C., and a copper manganese alloy solution is formed with the copper manganese mother alloy. In this step, the copper-manganese alloy can be put into a high-frequency melting furnace and melted in the melting furnace to increase the temperature, the temperature can be raised between 1000-1050 ° C., and further reach 1100 ° C. The process is continued for 5-10 minutes to dissolve the copper manganese alloy into a copper manganese alloy solution. The operation | movement mentioned above can avoid that the liquid in which the copper manganese was melt | dissolved absorbed the large amount of external gas, and the crack action generate | occur | produced in the alloy material shape | molded by the temperature being too high.

Step S104: The temperature of the copper manganese alloy solution is lowered between 950-1000 ° C. In this step, when the temperature in the melting furnace rises between 1000-1050 ° C. and lasts for 5-10 minutes, the power of the high-frequency melting furnace is turned off and the temperature in the melting furnace is lowered to 950-1000 ° C. At the same time, the copper manganese alloy solution is maintained in a molten state.

Step S106: Cover the surface of the copper-manganese alloy solution with rice, which is a glass faux additive. In this step, the surface of the copper manganese alloy solution at 950-1000 ° C. is covered with a glass-making agent to effectively block the contact between the liquid and air, and at 950-1000 ° C. to the zinc added in the next step. It is possible to prevent boiling volatilization due to high-temperature dissolution between the two.

Step S108: Zinc is added to the copper manganese alloy solution to form a copper manganese zinc solution. In this step, zinc is added into the melting furnace and submerged in the copper manganese alloy solution, and zinc is sufficiently dissolved in the copper manganese alloy solution to form a copper manganese zinc solution.

Step S110: The copper manganese zinc solution is removed. In this step, first, the copper manganese zinc solution is stirred and mixed by the action of high frequency induction, and then the glazing agent is scooped up. Then, the removal operation is performed using the removal agent.

Step S112: Lead, aluminum, and tin are added to the copper manganese zinc solution to form a metal solution. In this step, a copper lead mother alloy, a copper aluminum mother alloy, a copper tin mother alloy can be added to the copper manganese zinc solution.

Step S114: The temperature of the metal solution is raised between 1000-1050 ° C., and a copper boron alloy and a phosphor copper alloy are added to form a low lead brass alloy solution containing no bismuth and silicon.

Step S116: The brass alloy solution is discharged and cast to form a brass alloy. In this step, after the brass alloy solution is uniformly stirred, the hot water temperature is controlled between 1000-1050 ° C., and finally the brass alloy solution is poured out and cast, thereby not containing bismuth and silicon. It forms a brass alloy with low lead content, good processing performance, and excellent dezincification prevention performance and mechanical performance.

Example 1.
Table 1-1 shows five different groups of invention 1 obtained according to the above process, the numbers are 1001-1005, respectively, and the unit of each group is in weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 2
Table 2-1 shows five different groups of invention 2 obtained according to the above process, the numbers are 2001-2005 respectively, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 3
Table 3-1 shows eight different groups of invention 3 obtained according to the above steps, the numbers are 3001 to 3008, respectively, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 4
Table 4-1 shows eight different groups of invention 4 obtained according to the above process, the numbers are 4001 to 4008, respectively, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 5 FIG.
Table 5-1 shows eight different groups of invention 5 obtained according to the above process, the numbers are 5001 to 5008, respectively, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 6
Table 6-1 shows eight different groups of invention 6 obtained according to the above process, the numbers are 6001 to 6008, respectively, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 7
Table 7-1 shows 8 different groups of inventions 7 obtained according to the above process, the numbers are 7001-7008, respectively, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 8 FIG.
Table 8-1 shows 8 different groups of invention 8 obtained according to the above process, the numbers are 8001-8008, respectively, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 9
Table 9-1 shows eight different groups of inventions 9 obtained according to the above process, the numbers are 9001-9008, respectively, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 10
Table 10-1 shows five different groups of inventions 10 obtained according to the above process, the numbers are 10001-1000005, respectively, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 11
Table 11-1 shows eight different groups of inventions 11 obtained according to the above process, the numbers are 11001-11008, respectively, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

Example 12
Table 12-1 shows eight different groups of inventions 12 obtained according to the above process, the numbers are 12001-12008 each, and the unit of each group is weight percent (wt%). is there.

The alloys of the above group are tested for cutting performance, dezincification corrosion prevention performance, tensile strength and elongation at room temperature in the form of a cast state, and the contrast sample is lead-containing brass in the same state and the same standard, that is, , C36000 alloy.

The results of experiments on tensile strength, elongation, cutting performance and dezincification corrosion prevention performance are as follows.

As can be seen from the above, low lead brass alloys that do not contain bismuth and silicon are produced through a high-frequency melting furnace after adding various different substances at a certain ratio, and correspond to the known lead-containing brass. It has machining performance, excellent tensile strength, elongation, and dezincification prevention, is easy to cut, and has a low lead content. As an alloy material that replaces the known lead-containing brass, for example, it is suitable for use in the manufacture of products such as faucets and spare parts for toilets and bathroom products.

Although the present invention has been disclosed as described above by the embodiment, it is not limited to the embodiment. It will be understood by those skilled in the art to which the present invention belongs that various changes and modifications can be made without departing from the technical idea of the present invention. Therefore, the technical scope of the present invention must be determined by the claims.

Claims (12)

It is a low lead brass alloy that does not contain bismuth and silicon and has excellent machinability,
60-65 wt% copper, 0.1-0.25 wt% lead, 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin of the total weight of the brass alloy A low-lead brass alloy that does not contain bismuth and silicon and is excellent in machinability, characterized by comprising the remaining amount of zinc and inevitable impurities .   2. The bismuth and silicon-free composition according to claim 1, further comprising 0.05-0.5 wt% manganese and / or 0.05-0.3 wt% phosphorus based on the total weight of the brass alloy. Low lead brass alloy with excellent machinability.   One or more elements selected from 0.05-0.3 wt% phosphorus, 0.05-0.5 wt% manganese and 0.001-0.01 wt% boron of the total weight of the brass alloy; The low lead brass alloy according to claim 1, which does not contain bismuth and silicon and has excellent machinability.   It further includes 0.05-0.3 wt% phosphorus, 0.05-0.5 wt% manganese, and 0.001-0.01 wt% boron of the total weight of the brass alloy. The low lead brass alloy which does not contain the bismuth and silicon of Claim 1, and was excellent in machinability. 5. The impurity according to claim 4 , wherein the impurities include 0.25 wt% or less of nickel and / or 0.15 wt% or less of chromium and / or 0.25 wt% or less of iron of the total weight of the brass alloy. Low lead brass alloy that does not contain bismuth and silicon and has excellent machinability.   The total content of the manganese, aluminum, tin, phosphorus, and boron does not exceed 2 wt% of the total weight of the brass alloy and does not contain bismuth and silicon according to claim 4 and has excellent machinability. Low lead brass alloy.   The total content of manganese, aluminum, tin, phosphorus, and boron is not less than 0.1 wt% of the total weight of the brass alloy, and does not contain bismuth and silicon. Excellent low lead brass alloy. It is a low lead brass alloy that does not contain bismuth and silicon and has excellent machinability,
60-65 wt% copper of the total weight of the brass alloy, 0.1-0.25 wt% lead,
0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, 0.05-0.5 wt% manganese of the total weight of the brass alloy And a combination of two or more elements selected from 0.001-0.01 wt% of boron, manganese and boron, aluminum and tin, tin and phosphorus, phosphorus and boron, manganese and aluminum and tin, manganese and aluminum And phosphorus, manganese and aluminum and boron, manganese and tin and boron, aluminum and tin and phosphorus, aluminum and phosphorus and boron, manganese and aluminum and tin and phosphorus, manganese and aluminum and tin and boron, manganese and aluminum and phosphorus and boron Manganese, tin, phosphorus, boron, aluminum, tin, phosphorus, boron or manganese, aluminum, tin, phosphorus, boron And the element selected from the group consisting of 16 combinations of,
Low lead brass alloy that does not contain bismuth and silicon consisting of the remaining amount of zinc and inevitable impurities and has excellent machinability. 9. The impurity according to claim 8 , wherein the impurities include 0.25 wt% or less of nickel and / or 0.15 wt% or less of chromium and / or 0.25 wt% or less of iron of the total weight of the brass alloy. Low lead brass alloy that does not contain bismuth and silicon and has excellent machinability. It is a low lead brass alloy that does not contain bismuth and silicon and has excellent machinability,
60-65 wt% copper, 0.1-0.25 wt% lead, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus of the total weight of the brass alloy A low-lead brass alloy that does not contain bismuth and silicon and is excellent in machinability, characterized by comprising the remaining amount of zinc and inevitable impurities .   Two or more elements selected from 0.1-0.7 wt% aluminum, 0.05-0.5 wt% manganese and 0.001-0.01 wt% boron of the total weight of the brass alloy The low lead brass alloy according to claim 10, which does not contain bismuth and silicon and has excellent machinability. The said impurity contains 0.25 wt% or less nickel and / or 0.15 wt% or less chromium and / or 0.25 wt% or less iron of the total weight of the brass alloy. Low lead brass alloy that does not contain bismuth and silicon and has excellent machinability.

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