KR101420619B1 - Lead-free brass alloy and thereof manufacturing method - Google Patents

Abstract

The present invention is characterized in that copper (Cu), zinc (Zn), tin (Sn), aluminum (Al), and phosphorus (P) are the main components of a molten metal melt, Mn, Fe, Ni, Si, Mg, Cr, As, antimony, bismuth, cobalt, (S), boron (B), etc. should be recycled as valves, water meters, and metal fittings in consideration of the fact that metal scrap must be recycled. Free brass mass and a method of manufacturing the same.

Description

LEAD-FREE BRASS ALLOY AND THEREOF MANUFACTURING METHOD [0002]

More particularly, the present invention relates to a lead-free brass ingot and a method of manufacturing the same. More particularly, the present invention relates to a lead-free brass ingot and a method of manufacturing the same. More specifically, To a lead-free brass mass capable of being recycled as a product such as a valve, a water meter, and a faucet, and a manufacturing method thereof.

Generally, brass bars (alloys) are used for forging brass rods, brass rods, pleasant ropes rods, naive brass rods, and high-strength brass rods. These brass rods are widely used as faucet bricks. , It is easy to cause dezinc corrosion in seawater. Naebal brass, high strength brass rods have bad machinability and also have poor resistance to Na-Zn corrosion.

Furthermore, these brass blocks are widely used for machine parts, connecting parts for piping materials, piping and valves for drinking water.

Prior art documents include U.S. Patent No. 3,963,526, U.S. Patent No. 60-194035, U.S. Patent No. 6-1018184, and U.S. Patent Publication No. 10-1996-034443. US Patent No. 3,963,526 discloses a zinc alloy containing 61 to 66% by weight of copper by adding 0.02% by weight or more of arsenic, antimony, or phosphorus as a zinc defoaming agent, and heat-treating the zinc alloy at a temperature of 450 to 600 캜 The state is disclosing technology. Japanese Patent Application Laid-Open No. 60-194035 discloses a copper alloy containing 63.0 to 66.0 wt% of copper, 0.7 to 1.2 wt% of tin (Sn), 1.0 to 2.5 wt% of lead (Pb), 0.1 to 1.0 wt% of iron (Fe) , 0.1 to 0.7% by weight of nickel (Ni), 0.01 to 0.1% by weight of antimony (Sb), 0.01 to 0.2% by weight of phosphorus and the balance of zinc (Zn). Japanese Patent Application Laid-Open No. 6-108184 discloses a copper alloy containing 61.0 to 65.0 wt% of copper, 1.0 to 3.5 wt% of lead (Pb), 0.7 to 1.2 wt% of tin (Sn), 0.2 to 0.7 wt% of nickel By weight of iron (Fe), 0.03 to 0.4% by weight of iron (Fe), 0.02 to 0.10% by weight of antimony (Sb) and 0.04 to 0.15% And a brass alloy which is heat-treated at a temperature of 500 to 600 ° C. Korean Patent Laid-Open Publication No. 10-1996-034443 discloses a brass alloy based on copper (Cu) and zinc (Zn), which contains 59.5 to 62.5 wt% of copper (Cu), 1.7 to 2.5 wt% of lead (Pb) 0.05 to 0.2% by weight of iron (Fe), 0.8 to 1.2% by weight of tin (Sn), 0.05 to 0.3% by weight of nickel (Ni) and 0.16 to 0.22% by weight of arsenic (As) and zinc as the remainder.

An object of the present invention is to provide a method of manufacturing a lead-free brass mass by melting and collecting scrap metal scraps to remove impurities, obtaining a metal melt, injecting the metal melt as a lead- free brass mass into a product such as a valve, water meter, Lead-free brass ingot which can be recycled, and a method of manufacturing the same.

An object of the present invention is to provide a method for manufacturing a metal melting furnace in which molten metal scraps gathered and melted are made of copper (Cu), zinc (Zn), tin (Sn), aluminum (Al) Mn, Fe, Ni, Si, Mg, Cr, As, Sb, Bi, Co, ), Sulfur (S), boron (B), etc. are minimized in consideration of the necessity of recycling metal scraps, that is, they are almost zeroed and recycled as valves, water meters, Which is capable of preventing contamination and preventing waste of resources, and a manufacturing method thereof.

According to an aspect of the present invention, there is provided a lead-

(P), 0.01 to 0.3 wt% of phosphorus (P), 0.1 to 0.3 wt% of copper (Cu), 60 to 65 wt% of copper, 35 to 38 wt% of zinc, 0.6 to 1.5 wt% (Fe), 0.04 wt% or less of nickel (Ni), 0.02 wt% or less of silicon (Si), 0.0007 wt% or less of magnesium (Mg), 0.1 wt% or less of manganese (Mn) Of chromium (Cr), 0.02 wt% or less of arsenic (As), 0.06 wt% or less of antimony (Sb), 0.02 wt% or less of bismuth (Bi), 0.008 wt% or less of cobalt (Co) S) of 0.009 wt% or less, and boron (B) of 0.002 wt% or less.

In order to accomplish the above object, according to the present invention, there is provided a method for manufacturing a lead-

(S10) of melting a metal scrap at a temperature of 1200 to 1300 占 폚 for 3 to 6 hours to remove impurities to obtain a metal melt;

And a step (S20) for mass-producing a lead-free brass by injecting the metal melt into a metal mold and curing the metal melt,

Wherein the metal melt resulting from the melting of the metal scrap in the step S10 comprises 60 to 65 wt% of copper (Cu), 35 to 38 wt% of zinc (Zn), 0.6 to 1.5 wt% of tin (Sn) (Mn), 0.06 wt% or less of iron (Fe), 0.04 wt% or less of nickel (Ni), 0.1 wt% or less of silicon (P) (Si) of 0.02 wt% or less, magnesium (Mg) of 0.0007 wt% or less, chromium (Cr) of 0.008 wt% or less, arsenic (As) of 0.02 wt% or less, antimony (Sb) (Co), 0.009 wt% or less of sulfur (S), and 0.002 wt% or less of boron (B).

The present invention relates to a method for recovering waste metal scrap, comprising the steps of melting waste metal scraps to remove impurities, obtaining a metal melt, injecting the metal melt as a lead-free brass mass, and recycling the smokeless brass mass into a product such as a valve, water meter, There is an effect that can be done.

The present invention is characterized in that copper (Cu), zinc (Zn), tin (Sn), aluminum (Al), and phosphorus (P) are the main components of a molten metal melt, Mn, Fe, Ni, Si, Mg, Cr, As, antimony, bismuth, cobalt, (S), boron (B), etc. should be recycled as valves, water meters, and metal fittings in consideration of the fact that metal scrap must be recycled. Can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a method for manufacturing a lead-free brass ingot according to the present invention; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a lead-free brass ingot and a method of manufacturing the same according to the present invention will be described with reference to the drawings. I can understand it better.

The lead-free brass ingot according to the present invention comprises 60 to 65 wt% of copper (Cu), 35 to 38 wt% of zinc (Zn), 0.6 to 1.5 wt% of tin (Sn), 0.3 to 0.8 wt% of aluminum (Al) (Mn), 0.06 wt% or less of iron (Fe), 0.04 wt% or less of nickel (Ni), 0.02 wt% or less of silicon (Si) (Co), 0.02 wt% or less of arsenic (As), 0.06 wt% or less of antimony (Sb), 0.02 wt% or less of bismuth (Bi) 0.008 wt% or less, sulfur (S) 0.009 wt% or less, and boron (B) 0.002 wt% or less.

Table 1 shows the analysis results of the components of the lead-free brass ingot according to the present invention.

[Table 1]

1 is a flowchart showing a method for manufacturing a lead-free brass ingot according to the present invention.

A method for manufacturing a lead-free yellow ingot, comprising: a step (S10) of melting a metal scrap at a temperature of 1200 to 1300 占 폚 for 3 to 6 hours to remove impurities to obtain a metal melt; (S20) of mass production of a lead-free brass mass by injecting and curing. In particular, in the step S10, the metal melt due to melting of the metal scrap includes 60 to 65 wt% of copper (Cu), 35 to 38 wt% (P), 0.1 wt% or less of lead (Pb), 0.008 wt% or less of manganese (Mn), and 0.1 to 3.0 wt% of iron (Fe), 0.04 wt% or less of nickel (Ni), 0.02 wt% or less of silicon (Si), 0.0007 wt% or less of magnesium (Mg), 0.008 wt% or less of chromium (Cr) (B), 0.002 wt% or less of antimony (Sb), 0.02 wt% or less of bismuth (Bi), 0.008 wt% or less of cobalt (Co), 0.009 wt% or less of sulfur do.

At this time, the metal melt is sampled and analyzed to find that it contains 60 to 65 wt% of copper (Cu), 35 to 38 wt% of zinc (Zn), 0.7 to 1.5 wt% of tin (Sn) (S10 + 1) of adjusting the amounts of copper (Cu), zinc (Zn), tin (Sn), aluminum (Al) and phosphorus (P) so as to maintain the phosphorus (P) As shown in FIG.

The lead-free brass ingot and its manufacturing method according to the present invention collect and dissolve the scrap metal from the waste metal to remove impurities, obtain a metal melt, inject the metal melt as a lead-free brass mass, , And water pipes and so on.

When the metal melt is sampled and analyzed in the step S10, the content of each component is adjusted so that a uniform lead-free brass mass can be mass-produced. Thus, when a valve, a water meter, Prevent the occurrence of defective products.

On the other hand, an alloy made by adding zinc (Zn) to copper (Cu), which is also called brass, forms bronze and important copper alloy. Brass was artificially manufactured since about 1520 when zinc was discovered. It is also called brass. Brass was artificially manufactured with bronze and important copper alloys since the discovery of zinc elements around 1520. In the form of natural alloys, they have been friendly to mankind since ancient Greece, and are most closely related to everyday life of nonferrous metals.

Brass is called "brass" in which the amount of zinc (Zn) melts in solid copper (up to about 35%) is called "brass". Because it is highly ductile, it is thickened or stretched to form plates, rods, . As the amount of zinc increases, the hardness and strength increase, and the chromaticity of the alloy approaches the yellow in the reddish color of the copper.

When zinc (Zn) is added in an amount more than the amount of solid solution in solid copper (Cu), extra zinc (Zn) makes a separate solid of copper (Cu) and β. Therefore, A mixture of solids (it is said to be two phases), and the color is again reddish.

Typical of these two-phase alloys is so-called indigo brass with 40% zinc (Zn), which is mostly brass ornamentation, such as ironware of building materials and door handles.

A representative example of α-brass is 30% zinc tin (Zn), and it is many that it is made from the plate such as vases. The coin is also alpha brass. There are various uses depending on the component of α-brass other than plagioclase.

20% Less than zinc (Zn) is closer to gold, and when a small amount of lead (Pb) is added, it becomes more like gold, so it is used as a decoration for gold buttons, emblems and altar. 20% Zinc (Zn) is a substitute for gold leaf. It is used for gold lettering and gold printing of books.

The alloy of 25 ~ 35% zinc is important as an industrial material. It is called as ginseng, 67/33, 65/35 depending on the amount of zinc (Zn), and it can be used as a bulb socket, It is used for other electric appliances such as household appliances. It is also used for interior decorating because it is gold and it is also used as casting.

Accordingly, in order to maintain proper ductility and ductility as a valve, a water meter, and a power tool, it is preferable that copper (Cu) is 60 to 65 wt% and zinc (Zn) is 35 to 38 wt% .

Copper (Cu) is a metal with a distinctive red luster. It is not only excellent in malleability, ductility, processability, but also strength. The conductivity of heat and electricity is the second largest after silver and the crystal is equiaxed. When heated, the dark oxidized copper becomes copper, and when heated above 1000 ° C, it becomes red copper oxide. Directly combine sulfur, chlorine, and phosphorus. And it does not oxidize in pure dry air, but rust in normal air due to moisture, it does not dissolve in pure water that does not contain salt and carbon dioxide, but it dissolves in salty water. In particular, the ammonium salt has a remarkable property. It cuts off air, does not react even when dilute sulfuric acid is added to copper, or boils, but gradually dissolves in the air. In sulfuric acid, sulfur dioxide (sulfur dioxide) is generated and melts.

In addition to copper itself, its use as an alloy such as brass, bronze, aluminum bronze, and beryllium copper is also very broad, and is particularly used as a copper wire and a copper alloy. The wire is made of various wires by dissolving the electrolytic copper and putting the hardened copper wire into the frame. The copper alloy and other alloys used for copper alloy and other alloys are appropriately mixed and melted and then processed into plates, rods, tubes, wires and the like using the copper ingot which is adjusted and injected into a predetermined component. Copper plates are used to make general pots and coins, as well as special pots, utilizing thermal conductivity and corrosion resistance.

Since zinc (Zn) inhibits the formation of oxides of tin (Sn), which will be described later, in the metal melt and low boiling point, the gas partial pressure of zinc (Zn) is increased to reduce gas absorption while reducing other water vapor or hydrogen partial pressure, So that the gas which has been absorbed by the gas can also be removed.

Tin (Sn) is an element to be added to suppress the elution of lead (Pb) by improving main constitution and corrosion resistance and it is difficult to expect improvement in casting when the content of tin (Sn) is 0.7 wt% Sn) is added in an amount exceeding 1.5 wt%, a weak gamma (?) Phase is formed and mechanical properties deteriorate. Therefore, the content of tin (Sn) is set to be 0.7 to 1.5 wt%.

Aluminum (Al) enhances the strength of α and β brass by enhancing the effect of solid solution without affecting hot workability, resistance to erosion corrosion, slipperiness and durability, and enhances the strength of α and β brass. A good liquidity effect can be expected.

Phosphorus (P) reacts with oxides in the metal melt and vaporizes at 350 ° C. Deoxidation results in good flow of the metal melt but increases the tendency to absorb hydrogen. If the content is less than 0.01 wt%, the effect is insufficient, and if the content is more than 0.3 wt%, the content of 0.01 to 0.3 wt% is considered to be taken into account that the tendency of hydrogen absorption is strengthened.

Lead (Pb) is absorbed into the human body through respiration, body contact, as well as food and drinking water from the atmosphere and accumulates in the bones. Thus, lead (Pn) accumulated in the human body causes development of a child , It can cause osteoporosis in adults and may cause jaundice and shock in skin and eyes due to jaundice, vomiting, digestive disorders, lethargy, gum black line, hypertension, visual disturbance, In the invention, it is limited to 0.1 wt% or less in consideration of the fact that metal scrap must be contained when recycled.

Manganese (Mn) is similar in appearance to iron (Fe) but is harder than iron (Fe) and tends to break. In the present invention, the content of Mn is limited to 0.008 wt% or less in consideration of the necessity of recycling metal scrap.

 Iron (Fe) is mainly added to improve mechanical strength. However, since it is not suitable for lead-free brass used in a valve or a power receiving tool, it is limited to 0.06 wt% or less in consideration of the necessity of recycling metal scrap. do.

Nickel (Ni) plays a role of inhibiting corrosion, but when it is added together with tin (Sn), formation of a passive film becomes easier, so it shows more improved corrosion resistance than when tin (Sn) is added alone. Nickel (Ni) improves strength and formability at room temperature and high temperature, and also increases corrosion resistance. In order to improve the corrosion resistance, strength and formability of the lead-free brass ingot, the present invention is limited to 0.04 wt% or less. When the content of nickel (Ni) exceeds 0.04 wt%, the strength and formability are deteriorated.

Silicon (Si) reduces susceptibility to stress corrosion cracking and inhibits evaporation of zinc (Zn) during heat treatment, so it is limited to 0.02wt% or less. If it is more than 0.02 wt%, it is considered that the mechanical characteristics of the lead-free brass can be impaired.

Magnesium (Mg) has a large difference in specific gravity from copper (Cu), and not only does it not mix well, but also greatly reduces the fluidity of the molten metal, which lowers casting workability and may cause the material to be weakened by excessive deoxidization. It is limited to 0.0007wt% or less considering that scrap must be contained when recycled.

Since chromium (Cr) has a good breaking property and has a ferromagnetism, it is not suitable for a lead-free brass ingot used for a valve or a power receiving tool, so that it is necessary to recycle metal scrap. wt%.

Arsenic (As) is used as an alloy additive. Adding a small amount of copper (Cu) increases the heat resistance. When a small amount is added to lead (Pb), the hardness is increased, and it is mainly added to lead-antimony bearing alloy. Arsenic compounds are used in preservatives, insecticides, fungicides and the like. However, arsenic and arsenic compounds are toxic. Especially, when the content of arsenic (As) exceeds 0.02 wt%, compounds are formed to lower the corrosion resistance of lead-free brass masses. In view of the fact that the metal scrap must be contained when recycling metal scrap, it is limited to 0.02 wt% or less.

Antimony (Sb) is widely used as an alloy. In particular, lead-antimony based, tin-antimony based, and lead-tin-antimony based systems are used for type metal alloys, bearing alloys, and electrode plates by using the property of expanding when solidified. As a pure metal, it is used as a protective coating, and in the present invention, it is limited to 0.06 wt% or less in consideration of the fact that it is contained in the metal scrap when it is recycled.

Bismuth (Bi) has a thermal conductivity smaller than that of any metal except mercury and has a large electrical resistance. It melts and expands 3-3.5% when solidified. When heated in the air, it gives off a blue-white flame and becomes yellow bismuth oxide. And bismuth oxide is produced while releasing hydrogen gas by reacting with water. In view of the fact that metal scrap is included in the recycling of the metal scrap in the present invention, it is limited to 0.02 wt% or less.

Cobalt (Co) is a lustrous metal similar to iron and is ferromagnetic. It does not melt well even when heated, and is rusted even if it is left in the air. In view of the fact that the metal scrap is included in the recycling of the metal scrap in the present invention, the content is limited to 0.008 wt% or less.

Sulfur (S) is a yellow non-metallic solid at normal temperature, and sulfur emits sulfur dioxide (SO ₂ ), which is very strong and burning while emitting a blue flame. The sulfur element is not toxic, but the sulfur compounds and hydrogen sulfide which are present in the melting process are toxic Therefore, it is limited to 0.009 wt% or less in consideration of the fact that the metal scrap must be contained when recycling the metal scrap.

Boron (B) has two isomers of amorphous brown powder and solid black solid with crystalline metallic luster. The hardness is 9.3, which is next to diamond (diamond) and is harder than boron carbide. In the present invention, it is limited to 0.002 wt% or less in consideration of the necessity of recycling metal scrap.

As described above, the lead-free brass ingot and the method of manufacturing the same according to the present invention are characterized in that copper (Cu), zinc (Zn), tin (Sn), aluminum (Al) And the remaining lead (Pb), manganese (Mn), iron (Fe), nickel (Ni), silicon (Si), magnesium (Mg), chromium (Cr), arsenic (As) Bismuth (Bi), cobalt (Co), sulfur (S), boron (B), etc. are minimized in consideration of the necessity of recycling metal scrap, (Metal tool) to be recycled, thereby preventing environmental pollution and preventing waste of resources.

The present invention can be used in an industrial field in which metal scrap is melted after being blinded and then recycled as a valve, a water meter, and a metal fitting to prevent environmental pollution and to prevent waste of resources.

S10: Step of obtaining a metal melt
S20: Step for mass production of lead-free brass mass

Claims (3)

(Al), 0.001 to 0.3 wt% of phosphorus (P), 0.001 to 0.3 wt% of phosphorus (P), 60 to 65 wt% of copper, 35 to 38 wt% of zinc, 0.7 to 1.5 wt% of tin 0.001 to 0.1 wt% of manganese (Mn), 0.00001 to 0.008 wt% of iron (Fe), 0.0001 to 0.06 wt% of iron (Fe), 0.0001 to 0.04 wt% of nickel (Ni), 0.0001 to 0.02 wt% 0.001 to 0.007 wt% of chromium (Cr), 0.0001 to 0.02 wt% of arsenic (As), 0.0001 to 0.06 wt% of antimony (Sb), 0.0001 to 0.02 wt% of bismuth (Bi) 0.00001 to 0.008 wt% of sulfur (Co), 0.00001 to 0.009 wt% of sulfur (S), and 0.00001 to 0.002 wt% of boron (B). (S10) of melting a metal scrap at a temperature of 1200 to 1300 占 폚 for 3 to 6 hours to remove impurities to obtain a metal melt;
And a step (S20) for mass-producing a lead-free brass mass by injecting the metal melt into a metal mold and curing the metal melt,
Wherein the metal melt after melting the metal scrap in the step S10 comprises 60 to 65 wt% of copper (Cu), 35 to 38 wt% of zinc (Zn), 0.7 to 1.5 wt% of tin (Sn) (P), 0.001 to 0.1 wt% of lead (Pb), 0.00001 to 0.008 wt% of manganese (Mn), 0.0001 to 0.06 wt% of iron (Fe), 0.0001 to 0.04 (As), 0.0001 to 0.02 wt% of silicon (Si), 0.000001 to 0.0007 wt% of magnesium (Mg), 0.00001 to 0.008 wt% of chromium (Cr) 0.001 to 0.009 wt% of boron (B), 0.00001 to 0.002 wt% of boron (B), 0.001 to 0.02 wt% of bismuth (Bi), 0.00001 to 0.002 wt% of cobalt Manufacture of lead - free brass. 3. The method of claim 2,
In step S10, the metal melt is sampled and analyzed to find that it contains 60-65 wt% copper, 35-38 wt% zinc, 0.7-1.5 wt% tin, 0.3-0.8 wt% aluminum, (S10 + 1) of adjusting the amounts of copper (Cu), zinc (Zn), tin (Sn), aluminum (Al) and phosphorus (P) so as to maintain the phosphorus (P) Further comprising the steps of: preparing a lead-free brass ingot.

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