TWI550105B - Lead - free bismuth - free silicon - brass alloy - Google Patents

Description

Lead-free, flawless and flawless brass alloy

The invention relates to an environmentally friendly brass alloy, in particular to a brass alloy material which is easy to cut and dezincification resistant.

Generally, as a processing brass, the proportion of zinc metal added is 38-42%. In order to make brass better processed, there is usually 2-3% lead in brass to increase strength and processability. Lead-containing brass has excellent formability (easy to make various shapes), machinability and wear resistance are widely used in various shapes of machined parts, and occupy a large proportion in the copper industry, which is recognized as important in the world. Basic materials. However, lead-containing brass is prone to lead dissolution in solid or gaseous form during production or use. Medical research indicates that lead damages human hematopoiesis and the nervous system, especially children's kidneys and other organs. All countries in the world pay great attention to the pollution caused by lead and the harm caused by lead. The National Sanitation Foundation (NSF) has set the allowable amount of lead to less than 0.25%. The Restriction of Hazardous Substances Directive , RoHS, etc. have been successively regulated to limit and prohibit the use of high-lead brass.

In addition, when the zinc content in the brass exceeds 20% by weight, dezincification is prone to corrosion, especially when the brass is exposed to a high chloride ion environment, such as a seawater environment, which accelerates the dezincification corrosion phenomenon. occur. Since the dezincification effect will seriously damage the structure of the brass alloy, the surface strength of the brass product is lowered, or even the brass tube is perforated, which is greatly shortened. The service life of brass products and causes problems in application.

Therefore, there is a need to provide an alloy formulation that can replace the high-lead brass and can resist dezincification corrosion, but still has to take into consideration casting properties, forgeability, machinability, corrosion resistance and mechanical properties to solve the aforementioned problem.

It is known from the prior art that niobium appears in the γ phase of the alloy metallographic structure (sometimes κ phase), and at this time, niobium can replace the role of lead in the alloy to some extent, and improve the machinability of the alloy. The machinability of the alloy increases with the increase of the content of niobium, but the melting point of niobium is high, the specific gravity is low, and it is easy to be oxidized. Therefore, after the niobium monomer is added into the furnace during the melting of the alloy, it floats on the surface of the alloy, when the alloy is molten. Niobium is oxidized to cerium oxide or other oxides, and it is difficult to produce a copper alloy containing cerium. If cerium is added as a Cu-Si alloy, the economic cost is high.

The addition of niobium to lead can be used as a cutting break point in the alloy structure to increase the machinability, but if the niobium content is too high, hot cracking is likely to occur during forging, which is not conducive to production.

Therefore, the object of the present invention is to provide a brass alloy excellent in tensile strength, elongation, dezincification resistance and machinability, and is suitable as a processed product requiring high strength and abrasion resistance, as well as forged products and castings. A constituent material such as a product is used. It can safely replace alloy copper containing a large amount of lead, and fully meets the requirements of human society for the restriction of lead-containing products.

In order to achieve the above object, the following lead-free and flawless brass alloys are proposed.

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as Invention 1) includes: 60-65 wt% of copper, 0.01-0.15 wt% of niobium, and 0.1-0.5 wt% of total weight of the brass alloy. Magnesium, the rest is zinc.

The present invention 1 controls the content of copper in the case of removing lead, antimony and bismuth. 60-65wt%, adding a small amount of bismuth and magnesium to form an intermetallic compound with copper to increase the machinability of the alloy, and also help the alloy to resist dezincification. In other words, the addition of bismuth and magnesium to the γ phase in Invention 1 improves the machinability. The metallographic structure of the alloy mainly includes α phase, β phase, γ phase, and intermetallic compounds distributed in grain boundaries or grains. Among them, copper and zinc constitute the main component of brass alloy, and addition of barium and magnesium is improved. In addition to the machinability of the alloy, it also contributes to dezincification resistance.

When the content of cerium is less than 0.01% by weight and the content of magnesium is less than 0.1% by weight, the formed Alloys do not meet the basic machinability required in industrial production. Moreover, the machinability of the alloy increases with the increase of the content of niobium and magnesium, but when the niobium content in the alloy is 0.15 wt% and the magnesium content is 0.5 wt%, the machinability improvement effect of the alloy is saturated.

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as the invention) 2) comprising: copper in an amount of 60-65 wt% based on the total weight of the brass alloy, 0.01-0.15 wt% of niobium, 0.1-0.5 wt% of magnesium, and 0.05-0.3 wt% of phosphorus based on the total weight of the brass alloy, and / or 0.05-0.5wt% manganese, the remainder is zinc.

In comparison, the inventive article 2 is further added to the brass alloy on the basis of the invention 1. The total weight is 0.05-0.3 wt% phosphorus, and/or 0.05-0.5 wt% manganese. Although phosphorus cannot form a γ phase, phosphorus has a function of forming a γ phase distribution of bismuth and magnesium, thereby improving the machinability of the alloy. At the same time, the addition of phosphorus will cause the crystallization of the main α phase, which will increase the casting properties and corrosion resistance of the alloy. When the contents of copper, barium and magnesium are 60-65 wt%, 0.01-0.15 wt% and 0.1-0.5 wt%, respectively, when the content of phosphorus is less than 0.05 wt%, the effect cannot be exerted, but when the content of phosphorus is higher than At 0.3% by weight, the casting properties and corrosion resistance of the alloy are rather lowered. Adding manganese helps to enhance the dezincification resistance and casting fluidity of the alloy. When the content of manganese is less than 0.05wt%, the effect cannot be effectively exerted, and when the content is 0.5wt%, the effect reaches the saturation value. .

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as the invention) 3), comprising: 60-65 wt% of copper based on the total weight of the brass alloy, 0.01-0.15 wt% of niobium, 0.1-0.5 wt% of magnesium, and 0.05-0.5 wt% of manganese based on the total weight of the brass alloy, and / or 0.1-0.7 wt% aluminum, and / or 0.05-0.5 wt% tin, and / or 0.05-0.3 wt% phosphorus, and / or 0.001-0.01 wt% boron, the balance is zinc.

Invention 3 further adds the total weight of the brass alloy on the basis of the invention 1. 0.05-0.5 wt% of manganese, and/or 0.1-0.7 wt% of aluminum, and/or 0.05-0.5 wt% of tin, and/or 0.05-0.3 wt% of phosphorus, and/or 0.001-0.01 wt% boron.

The addition of tin to the alloy is also to form the γ phase and improve the machinability of the alloy. Moreover, the addition of tin significantly improves the strength of the alloy, and improves its plasticity and corrosion resistance. However, considering the addition of tin, the cost is high. Therefore, adding aluminum while adding tin can improve the alloy's machinability, and also improve alloy strength, wear resistance, casting fluidity and high temperature oxidation resistance. The above effects are well exerted, and the contents of tin and aluminum are 0.05-0.5 wt% and 0.1-0.7 wt%, respectively. At the same time, a trace amount of boron is added to the alloy to improve the corrosion resistance of the alloy. After adding boron, the alloy can be dezinced and the mechanical strength can be enhanced. At the same time, the defect structure of the cuprous oxide film on the surface of the copper alloy can be changed to make the oxide The copper film is more uniform and dense. When the content of boron is less than 0.001% by weight, the above effect cannot be exerted, and when it is more than 0.01% by weight, the above properties are not further improved, so that the preferable content of boron is 0.001 to 0.01% by weight. The content range of phosphorus and manganese is the same as that of the invention 2, and the reason is the same as that of the invention 2. Among them, the addition of strontium, magnesium, aluminum, tin, phosphorus, manganese and boron is selected according to the different requirements of different products for machinability.

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as the invention) 4), including: 60-65 wt% of copper based on the total weight of the brass alloy, 0.01-0.15 wt% of bismuth, 0.1-0.5 wt% Magnesium, and 0.05 to 0.5 wt% of manganese, and/or 0.1 to 0.7 wt% of aluminum, and/or 0.05 to 0.5 wt% of tin, and/or 0.05 to 0.3 wt% of phosphorus, based on the total weight of the brass alloy. And/or 0.001-0.01 wt% boron, the balance being zinc. Wherein, the total content of manganese, aluminum, tin, phosphorus and boron does not exceed 2% by weight of the total weight of the brass alloy.

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as the invention) 5) comprising: copper in an amount of 60-65 wt% based on the total weight of the brass alloy, 0.01-0.15 wt% of niobium, 0.1-0.5 wt% of magnesium, and 0.05-0.5 wt% of manganese based on the total weight of the brass alloy, and / or 0.1-0.7 wt% aluminum, and / or 0.05-0.5 wt% tin, and / or 0.05-0.3 wt% phosphorus, and / or 0.001-0.01 wt% boron, the balance is zinc. Wherein, the total content of manganese, aluminum, tin, phosphorus and boron is 0.2-2% by weight based on the total weight of the brass alloy.

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as the invention) 6), comprising: 60-65 wt% of copper based on the total weight of the brass alloy, 0.01-0.15 wt% of niobium, 0.1-0.5 wt% of magnesium, and 0.05-0.5 wt% of manganese based on the total weight of the brass alloy, and / or 0.1-0.7wt% aluminum, and / or 0.05-0.5wt% tin, and / or 0.05-0.3wt% phosphorus, and / or 0.001-0.01wt% boron, the rest is zinc and inevitable Impurities. The unavoidable impurities include: nickel of 0.25 wt% or less based on the total weight of the brass alloy, and/or chromium of 0.15 wt% or less, and/or iron of 0.25 wt% or less.

Invention 6 includes some unavoidable impurities on the basis of Invention 3, that is, Mechanical impurities such as nickel, and / or chromium, and / or iron.

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as the invention) 7), comprising: 60-65 wt% of copper, 0.05-0.5 wt% of tin, and more than two or more selected from the total weight of the brass alloy, 0.1-0.7 wt% of aluminum, 0.05-0.3 wt. % phosphorus, 0.05-0.5 wt% manganese, the remainder being zinc.

In the absence of barium and magnesium, the addition is 0.05-0.5% by weight based on the total weight of the alloy. Tin can also meet the needs of industrial production for machinability. The content of the content is the same as that of the invention 3, and the reason is the same as that explained in the invention 3; the addition of aluminum, phosphorus and manganese is different according to the same. The product is selected for the level of machinability, and the content is in the same range as the invention 3, for the same reason as that described in Invention 3.

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as the invention) 8), comprising: 60-65 wt% of copper, 0.05-0.5 wt% of tin, of the total weight of the brass alloy, two or more selected from the group consisting of 0.1-0.7 wt% of aluminum, 0.05-0.3 wt% of the total weight of the brass alloy Phosphorus, 0.05-0.5 wt% manganese, and 0.01-0.15 wt% bismuth, and/or 0.1-0.5 wt% magnesium, and/or 0.001-0.01 wt% boron, based on the total weight of the brass alloy, the remainder For zinc.

Among them, the addition of strontium, magnesium, aluminum, tin, phosphorus, manganese and boron is different according to The product is selected for the level of machinability, and the content is in the same range as the invention 3, for the same reason as that described in Invention 3.

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as the invention) 9), comprising: 60-65 wt% of copper, 0.05-0.5 wt% of tin, of the total weight of the brass alloy, two or more selected from the group consisting of 0.1-0.7 wt% of aluminum, 0.05-0.3 wt% of the total weight of the brass alloy Phosphorus and 0.05-0.5 wt% of manganese, and 0.01-0.15 wt% of barium, and/or 0.1-0.5 wt% of magnesium, and/or 0.001-0.01 wt% of boron, based on the total weight of the brass alloy, and the rest Part is zinc and inevitable impurities. The unavoidable impurities include: 0.25 wt% or less of nickel based on the total weight of the brass alloy, and/or 0.15 wt% or less of chromium, and/or 0.25 wt% or less of iron.

Invention 9 includes some unavoidable impurities on the basis of Invention 8, ie Mechanical impurities such as nickel, and / or chromium, and / or iron.

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as the invention) 10) comprising: 60-65 wt% copper, 0.01-0.15 wt% bismuth, 0.1-0.5 wt% magnesium, and more than one selected from the total weight of the brass alloy, 0.1-0.7 wt%, based on the total weight of the brass alloy. Aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, 0.05-0.5 wt% manganese, and 0.001-0.01 wt% boron, the balance being zinc.

The addition or not of aluminum, tin, phosphorus, manganese and/or boron and its content are based on The same product is selected for the level of machinability, and the content is in the same range as the invention 3, for the same reason as that described in Invention 3.

A brass alloy with good lead-free, flawless and flawless machinability (hereinafter referred to as the invention) 11) comprising: 60-65 wt% copper, 0.01-0.15 wt% bismuth, 0.1-0.5 wt% magnesium, and more than one selected from the total weight of the brass alloy, 0.1-0.7 wt%, based on the total weight of the brass alloy. Aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, 0.05-0.5 wt% manganese, 0.001-0.01 wt% boron, the balance being zinc and unavoidable impurities. The unavoidable impurities include: 0.25 wt% or less of nickel based on the total weight of the brass alloy, and/or 0.15 wt% or less of chromium, and/or 0.25 wt% or less of iron.

The invention 11 includes some unavoidable impurities on the basis of the invention 10. Quality, ie mechanical impurities nickel, and / or chromium, and / or iron.

The present invention further provides a method for producing a brass alloy. Taking one of the solutions of the invention 3 as an example, the method comprises the following steps: 1) providing copper and manganese and raising the temperature to 1000-1050 ° C to form the copper and the manganese to form a copper. a manganese alloy melt; 2) reducing the temperature of the copper-manganese alloy melt to 950-1000 ° C; 3) covering a glass slag-forming agent on the surface of the copper-manganese alloy melt; 4) adding zinc to the copper-manganese alloy melt to form a copper-manganese-zinc melt; 5) removing the slag from the copper-manganese-zinc melt, adding bismuth, aluminum, tin, magnesium to the brass alloy material melt Inside, forming a molten metal; 6) raising the temperature of the molten metal to 1000-1050 ° C, and adding a boron-copper alloy, a phosphor bronze alloy to form a lead-free, flawless, non-twisted brass alloy melt; The brass alloy melt is cast out to form the brass alloy material.

Preferably, in the above production method, a copper-manganese alloy is provided as a source of copper and manganese elements.

Preferably, in the above manufacturing method, the melting furnace used is a high-frequency melting furnace, and the high-frequency melting furnace is lined with graphite crucible.

The high frequency melting furnace has the characteristics of fast melting rate, fast heating, clean and pollution-free, and self-stirring in the melting process (ie, affected by magnetic lines of force).

The lead-free and antimony-free brass alloy described in the present invention is added in a certain proportion through various substances, and then processed by a high-frequency melting furnace to produce mechanical processing properties comparable to known lead-containing brass, and good resistance. It has good tensile strength, elongation, dezincification resistance and lead-free. It is suitable for use as an alloy material for replacing known lead-containing brass, such as faucets or spare parts for bathroom products.

S100‧‧‧ provides copper-manganese alloy

S102‧‧‧Heat melting of the master alloy

S104‧‧‧Reducing the temperature of copper-manganese master alloy

S106‧‧‧ Covering copper-manganese melt with glass slagging agent

S108‧‧‧Adding zinc to copper-manganese melt to form copper-manganese-zinc melt

S110‧‧‧Slag removal of molten metal

S112‧‧‧Adding bismuth, aluminum, magnesium and tin alloy to the melt

S114‧‧‧ Raise the melt temperature to the furnace temperature

S116‧‧‧Exterminating the casting operation

FIG. 1 is a flow chart showing a manufacturing method of one of the inventions 3.

In order to more clearly illustrate the technical solution of the present invention, the technology of the present invention will be described below by way of embodiments.

The scope of the invention is not intended to be limited to the exemplary embodiments described. (related fields And other variations of the features of the invention described herein, as well as other applications of the principles of the invention described herein, are considered to be within the scope of the invention.

The above and the following in the numerical description of the present invention are all included to include the present number.

The anti-dezincification corrosion resistance test referred to herein is in the form of as-cast AS-2345-2006 was carried out by adding 12.8 g of copper chloride to 1000 C.C of deionized water and placing the test substance therein for 24 hours to measure the dezincification depth. ◎ represents a dezincification depth of less than 100 μm; ○ represents a dezincification depth of between 100 μm and 200 μm; and ㄨ represents a dezincification depth of more than 200 μm.

The cutting performance test referred to in this paper is in the form of as-cast, using the same tool, the same cutting speed and the same amount of cutting, cutting speed is 25m / min (m / min), the amount of feed is 0.2mm / r (mm/number of blades), the cutting depth is 0.5mm, the diameter of the test bar is 20mm, and the relative cutting rate is obtained by measuring the cutting resistance based on the C36000 alloy material.

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

◎ represents a relative cutting rate greater than 85%; ○ represents a relative cutting rate greater than 70%.

The tensile strength and elongation tests referred to herein were all tested in the as-cast condition at room temperature. The elongation is the percentage of the ratio of the total deformation ΔL of the gauge length after the tensile fracture of the sample to the length L of the original gauge length: δ = ΔL / L × 100%. The comparative sample is a lead-containing yellow brass of the same specification and the same specification, that is, a C36000 alloy.

The composition ratio of C36000 alloy material is as follows, the unit is weight percentage (wt%):

1 is a flow chart of a manufacturing method of an embodiment of the invention 3, comprising the following steps: Step S100: providing a copper and manganese mother alloy. In this step, a copper-manganese alloy can be provided as a source for providing the copper and manganese elements.

Step S102: heating the copper-manganese mother alloy to a temperature between 1000 and 1050 ° C to form a copper-manganese alloy melt to form a copper-manganese alloy melt. In this step, the copper-manganese alloy can be added to a high-frequency melting furnace, and the melting temperature is raised in the melting furnace to raise the temperature to between 1000-1050 ° C, even up to 1100 ° C, and the process lasts for 5-10 minutes. The copper-manganese alloy is melted into a copper-manganese alloy melt. The above action can prevent the liquid melted by copper and manganese from absorbing a large amount of external gas due to the temperature being too high, resulting in cracking of the formed alloy material.

Step S104: lowering the temperature of the copper-manganese alloy melt to between 950 and 1000 °C. In this step, when the temperature in the melting furnace is raised to between 1000 and 1050 ° C, when the temperature is maintained for 5 to 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, and the copper manganese is simultaneously The alloy melt is also kept molten.

Step S106: covering the glass slagging agent on the surface of the copper-manganese alloy melt. In this step, the glass slagging agent is coated on the surface of the copper-manganese alloy melt at 950-1000 ° C. This step can effectively block the contact of the liquid with air and prevent the zinc added in the next step between 950-1000 ° C. Boiling volatilization due to high temperature melting.

Step S108: adding zinc to the copper-manganese alloy melt to form a copper-manganese-zinc melt. In this step, zinc is added to the melting furnace, and the copper-manganese alloy melt is sunk to make the zinc and copper-manganese alloy melt The melt is fully melted to form a copper manganese zinc melt.

Step S110: removing slag from the copper manganese zinc melt. In this step, the copper manganese zinc melt can be stirred and mixed by the action of high-frequency induction, and then the slag-forming agent is picked up. Then, the slag removing agent is used for slag removal.

Step S112: adding bismuth, aluminum, tin, magnesium to the copper manganese zinc melt to form a molten metal. In this step, a copper bismuth mother alloy, a copper aluminum mother alloy, a copper tin mother alloy, and a copper-magnesium alloy may be added to the copper manganese zinc melt.

Step S114: Raise the melt temperature to the tapping temperature. In this step, the temperature of the molten metal is raised to between 1000 and 1050 ° C, and a copper-boron alloy and a phosphor bronze alloy are added to form a lead-free, antimony-free, brass-free alloy melt.

Step S116: The brass alloy melt is cast out to form a brass alloy. In this step, after uniformly stirring the brass alloy melt, the temperature of the tapping furnace is controlled between 1000-1050 ° C, and finally the brass alloy melt is discharged into a furnace to produce lead-free, flawless and flawless, good processing performance and resistance. Brass alloy with dezincification and good mechanical properties.

Example 1

In Table 1-1, the invention 1 of five different components prepared according to the above process is numbered 1001-1005, and each component is in weight percent (wt%).

The alloy of the above components is cut in the as-cast form at room temperature. Test for dezincification corrosion resistance, tensile strength and elongation. The comparative samples are lead-containing brass of the same specification and the same specification, namely C36000 alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

Example 2

In Table 2-1, there are five different components of Invention 2 prepared according to the above process, numbered 2001-2005, and each component is in weight percent (wt%).

The alloys of the above components were tested in the as-cast form at room temperature under the conditions of cutting performance, dezincification resistance, tensile strength and elongation. The comparative samples were lead-containing brass of the same specification and the same specification, namely C36000. alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

Example 3

In Table 3-1, there are 8 different components of Invention 3 prepared according to the above process, numbered 3001-3008, and each component is in weight percent (wt%).

The alloys of the above components were tested in the as-cast form at room temperature under the conditions of cutting performance, dezincification resistance, tensile strength and elongation. The comparative samples were lead-containing brass of the same specification and the same specification, namely C36000. alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

Example 4

In Table 4-1, there are 8 different components of Invention 4 prepared according to the above process, numbered 4001-4008, and each component is in weight percent (wt%).

The alloys of the above components were tested in the as-cast form at room temperature under the conditions of cutting performance, dezincification resistance, tensile strength and elongation. The comparative samples were lead-containing brass of the same specification and the same specification, namely C36000. alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

Example 5

In Table 5-1, there are eight different components of Invention 5 prepared according to the above process, numbered 5001-5008, and each component is in weight percent (wt%).

The alloys of the above components were tested in the as-cast form at room temperature under the conditions of cutting performance, dezincification resistance, tensile strength and elongation. The comparative samples were lead-containing brass of the same specification and the same specification, namely C36000. alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

Example 6

In Table 6-1, there are 8 different components of Invention 6 prepared according to the above process, numbered 6001-6008, and each component is in weight percent (wt%).

The alloys of the above components were tested in the as-cast form at room temperature under the conditions of cutting performance, dezincification resistance, tensile strength and elongation. The comparative samples were lead-containing brass of the same specification and the same specification, namely C36000. alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

Example 7

In Table 7-1, there are eight different components of Invention 7 prepared according to the above process, numbered 7001-7008, and each component is in weight percent (wt%).

The alloys of the above components were tested in the as-cast form at room temperature under the conditions of cutting performance, dezincification resistance, tensile strength and elongation. The comparative samples were lead-containing brass of the same specification and the same specification, namely C36000. alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

Example 8

In Table 8-1, there are eight different compositions of Invention 8 prepared according to the above process, numbered 8001-8008, and each component is in weight percent (wt%).

The alloys of the above components were tested in the as-cast form at room temperature under the conditions of cutting performance, dezincification resistance, tensile strength and elongation. The comparative samples were lead-containing brass of the same specification and the same specification, namely C36000. alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

Example 9

Table 9-1 shows the invention 9 of 8 different components prepared according to the above process. No. 9001-9008, the unit of each component is weight percentage (wt%).

The alloy of the above components is cut in the as-cast form at room temperature. Test for dezincification corrosion resistance, tensile strength and elongation. The comparative samples are lead-containing brass of the same specification and the same specification, namely C36000 alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

Example 10

Table 10-1 shows the invention 10 of eight different components prepared according to the above process. The numbers are 10001-10008, and the units of each component are weight percentage (wt%).

The alloy of the above components is cut in the as-cast form at room temperature. Test for dezincification corrosion resistance, tensile strength and elongation. The comparative samples are lead-containing brass of the same specification and the same specification, namely C36000 alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

Example 11

Table 11-1 shows the invention 11 of eight different components prepared according to the above process, The numbers are 11001-11008, and the unit of each component is weight percentage (wt%).

The alloy of the above components is cut in the as-cast form at room temperature. Test for dezincification corrosion resistance, tensile strength and elongation. The comparative samples are lead-containing brass of the same specification and the same specification, namely C36000 alloy.

The tensile strength, elongation, cutting performance and resistance to dezincification corrosion are as follows:

It can be seen from the above that after adding a certain amount of different substances in a certain proportion, The Zhoubo melting furnace produces mechanical processing properties comparable to known lead-containing brass, as well as good resistance It has good tensile strength, elongation, good dezincification resistance, easy cutting and lead-free. It is suitable for use as an alloy material for replacing known lead-containing brass, such as faucets or bathroom accessories.

While the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the invention. The scope is subject to the scope of the patent application.

S100‧‧‧ provides copper-manganese alloy

S102‧‧‧Heat melting of the master alloy

S104‧‧‧Reducing the temperature of copper-manganese master alloy

S106‧‧‧ Covering copper-manganese melt with glass slagging agent

S108‧‧‧Adding zinc to copper-manganese melt to form copper-manganese-zinc melt

S110‧‧‧Slag removal of molten metal

S112‧‧‧Adding bismuth, aluminum, magnesium and tin alloy to the melt

S114‧‧‧ Raise the melt temperature to the furnace temperature

S116‧‧‧Exterminating the casting operation

Claims (11)

A brass alloy with good lead-free, flawless and flawless machinability, comprising: 60-65 wt% of copper, 0.01-0.15 wt% of bismuth, 0.1-0.5 wt% of magnesium, and the balance being zinc. . The brass alloy having good lead-free and flawless machinability as described in Patent Application No. 1 further comprises: 0.05-0.3 wt% of phosphorus, and/or 0.05-0.5 wt% of manganese, based on the total weight of the brass alloy. The brass alloy having good lead-free and flawless machinability as described in Patent Application No. 1 further comprises: 0.05-0.5 wt% of manganese, and/or 0.1-0.7 wt% of aluminum, based on the total weight of the brass alloy. And/or 0.05-0.5 wt% tin, and/or 0.05-0.3 wt% phosphorus, and/or 0.001-0.01 wt% boron. A lead-free, flawless and machinable brass alloy according to claim 3, wherein the total content of the manganese, aluminum, tin, phosphorus, and boron is not more than 2% by weight based on the total weight of the brass alloy. The brass alloy of the lead-free, flawless and non-cracking machinability as described in claim 4, wherein the total content of the manganese, aluminum, tin, phosphorus, and boron is not less than 0.2 wt% of the total weight of the brass alloy. . The brass alloy of the lead-free, flawless and non-cracking machinability described in Patent Application No. 3 further includes unavoidable impurities, including nickel which is 0.25 wt% or less based on the total weight of the brass alloy, and/or 0.15 wt%. The following chromium, and/or iron of 0.25 wt% or less. The brass alloy having good lead-free and flawless machinability as described in Patent Application No. 1 further comprises: tin in an amount of 0.05-0.5% by weight based on the total weight of the brass alloy, and two or more selected from the total of the brass alloy. The weight is 0.1-0.7 wt% aluminum, 0.05-0.3 wt% phosphorus, 0.05-0.5 wt% manganese. The brass alloy having good lead-free and flawless machinability as described in claim 7 further comprises boron in an amount of 0.001 to 0.01% by weight based on the total weight of the brass alloy. The brass alloy of the lead-free, flawless and non-defective machinability described in Patent Application No. 8, which further includes unavoidable impurities, including nickel which is 0.25 wt% or less based on the total weight of the brass alloy, and/or 0.15. Chromium below wt%, and/or iron below 0.25 wt%. A brass alloy with good lead-free, flawless and flawless machinability, comprising: 60-65 wt% copper, 0.01-0.15 wt% bismuth and 0.1-0.5 wt% magnesium, and more than one selected from the total weight of the brass alloy. Self-occupying the total weight of the brass alloy of 0.1-0.7wt% aluminum, 0.05-0.5wt% tin, 0.05-0.3wt% phosphorus, 0.05-0.5wt% manganese and 0.001-0.01wt% boron, the rest Part is zinc. The lead-free, flawless and machinable brass alloy as described in Patent Application No. 10 further includes unavoidable impurities, including nickel which is 0.25 wt% or less based on the total weight of the brass alloy, and/or 0.15 wt%. The following chromium, and/or iron of 0.25 wt% or less.