TW201527559A - Low-lead bismuth-free silicone-free brass - Google Patents

Abstract

A low-lead bismuth-free silicone-free brass alloy, comprising: copper, accounting for 60-65 wt% of the total brass alloy weight, 0.1-0.25 wt% lead, 0.1-0.7 wt% aluminium, 0.05-0.5 wt% tin, and one or more of the elements 0.05-0.3 wt% phosphorus, 0.05-0.5 wt% manganese, and 0.001-0.01 wt% boron, the remainder being zinc; and having good machinability.

Description

Low lead, flawless and flawless brass alloy

The invention relates to a low-lead brass alloy, in particular to a brass alloy material which has both easy cutting and dezincification resistance.

Generally, as a processing brass, the proportion of zinc metal added is 38-42%. In order to make brass better processed, there are usually 2 to 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, dezincifieation corrosion is prone to occur, especially when the brass is exposed to a high chloride ion environment, such as a seawater environment, the dezincification corrosion phenomenon is accelerated. 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 high-quality 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 foregoing The 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.

An object of the present invention is to provide a brass alloy excellent in tensile strength, elongation, excellent dezincification resistance and machinability, and is suitable as a processed product requiring high strength and abrasion resistance, as well as forged products and cast products. The constituent materials are 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 objectives, the following low-lead, flawless and flawless brass alloys are proposed.

A brass alloy with low lead-free and flawless machinability (hereinafter referred to as Invention 1), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, 0.1-0.7 wt%, based on the total weight of the brass alloy. Aluminum, 0.05-0.5 wt% tin, the remainder is zinc.

The present invention 1 controls the copper content after reducing the lead content to 0.1-0.25 wt%. At 60-65 wt%, a small amount of aluminum and tin are added to improve the machinability of the alloy. The metallographic structure of the alloy mainly includes α phase, β phase, γ phase, and soft and brittle intermetallic compounds distributed in grain boundaries or grains, wherein copper and zinc constitute the main components of the brass alloy.

The addition of tin to the alloy can form a γ phase, thereby improving the machinability of the alloy, and the addition of tin significantly improves the strength of the alloy, and improves the 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.

A brass alloy having low lead-free and flawless machinability (hereinafter referred to as Invention 2), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, 0.1-0.7 wt%, based on the total weight of the brass alloy. Aluminum, 0.05-0.5 wt% tin, and including 0.05-0.5 wt% manganese, and/or 0.05-0.3 wt% phosphorus, based on the total weight of the brass alloy, the balance being zinc.

In contrast, the inventive article 2 further adds 0.05 to 0.3% by weight of phosphorus, and/or 0.05 to 0.5% by weight of manganese on the basis of the invention 1. Although phosphorus cannot form a γ phase, phosphorus has a function of making the γ phase distribution good, 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 content of phosphorus is less than 0.05% by weight, the effect cannot be exerted, but when the content of phosphorus is more than 0.3% by weight, casting properties and corrosion resistance are rather lowered. The addition of manganese contributes to dezincification resistance and casting fluidity. When the content of manganese is less than 0.05% by weight, the effect cannot be effectively exerted, and when the content is 0.5% by weight, the effect reaches a saturation value.

A brass alloy with low lead, flawless and flawless machinability (hereinafter referred to as the invention) 3), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, 0.1-0.7 wt% of aluminum, 0.05-0.5 wt% of tin, and more than one selected from brass. The total weight of the alloy is 0.05-0.3 wt% phosphorus, 0.05-0.5 wt% manganese, and 0.001-0.01 wt% boron, with the balance being zinc.

Inventive 3 further adds a trace amount of boron to the invention 2, which can better inhibit the dezincification of the alloy, enhance its mechanical strength, and at the same time change the defect structure of the cuprous oxide film on the surface of the copper alloy to make the cuprous oxide film more Uniform, compact and good anti-fouling performance. 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.

A brass alloy having low lead-free and flawless machinability (hereinafter referred to as Invention 4), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, 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.

The role of lead, aluminum, tin, phosphorus, manganese, and boron in brass alloys has been discussed above. The addition of these elements to brass alloys can improve the mechanical properties of the alloy and meet the requirements of high-demand products. need.

A brass alloy with low lead-free and flawless machinability (hereinafter referred to as Invention 5), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, 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 and unavoidable impurities. The impurities include nickel in an amount of 0.25 wt% or less 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 5 on the basis of Invention 4 includes some unavoidable impurities, namely mechanical impurities nickel, and/or chromium, and/or iron.

A brass alloy with low lead-free and flawless machinability (hereinafter referred to as invention 6), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, 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. Wherein, the total content of aluminum, tin, phosphorus, manganese and boron does not exceed 2% by weight of the total weight of the brass alloy.

A brass alloy with low lead-free and flawless machinability (hereinafter referred to as Invention 7), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, 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. Wherein, the total content of aluminum, tin, phosphorus, manganese and boron accounts for 0.2-2% by weight of the total weight of the brass alloy.

A brass alloy having low lead-free and flawless machinability (hereinafter referred to as Invention 8), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, and two or more selected from the total weight of the brass alloy. The total weight of the brass alloy is 0.1-0.7 wt% 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, and the rest is Zinc. Among them, the addition of aluminum, tin, phosphorus, manganese and boron is selected according to the requirements of different products for machinability, and the content is in the same range as the invention 3, and the reason is also explained in the reason of the invention 3. the same.

A brass alloy having low lead-free and flawless machinability (hereinafter referred to as Invention 9), comprising copper in an amount of 60-65 wt%, 0.1-0.25 wt% of lead, and two or more selected from the total weight of the brass alloy. 0.1 to 0.7 wt% of aluminum, 0.05 to 0.5 wt% of tin, based on the total weight of the brass alloy, 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 impurities include nickel in an amount of 0.25 wt% or less 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.

Inventive Article 9 includes on the basis of Invention 8 some unavoidable impurities, namely mechanical impurities nickel, and/or chromium, and/or iron.

A brass alloy with low lead-free and flawless machinability (hereinafter referred to as Invention 10), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, 0.05-0.5 wt%, based on the total weight of the brass alloy. Tin, 0.05-0.3 wt% phosphorus, the balance being zinc.

The section of the phosphorus content in the invention 10 and the action thereof are the same as those of the invention 2, and although phosphorus cannot form a γ phase, phosphorus has a function of making the γ phase distribution good. 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. Therefore, even without aluminum, the need for machinability under normal production conditions can be met.

A brass alloy with low lead-free and flawless machinability (hereinafter referred to as invention 11), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, 0.05-0.5 wt%, based on the total weight of the brass alloy. Tin and 0.05-0.3 wt% phosphorus, and two or more selected from the group consisting of 0.1-0.7 wt% aluminum, 0.05-0.5 wt% manganese, 0.001-0.01 wt% boron, and the remainder Zinc. Among them, the addition of aluminum, manganese, and boron is selected according to the requirements of different products for machinability, and the content is in the same range as that of the invention 3, and the reason is the same as that explained in the invention 3.

A brass alloy with low lead-free and flawless machinability (hereinafter referred to as invention 12), which comprises 60-65 wt% of copper, 0.1-0.25 wt% of lead, 0.05-0.5 wt%, based on the total weight of the brass alloy. Tin, 0.05-0.3 wt% phosphorus, and two or more selected from the total weight of the brass alloy The amount is 0.1-0.7 wt% aluminum, 0.05-0.5 wt% manganese, 0.001-0.01 wt% boron, and the balance is zinc and unavoidable impurities. The impurities include nickel in an amount of 0.25 wt% or less 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 12 comprises on the basis of the invention 11 some unavoidable impurities, namely mechanical impurities nickel, and/or chromium, and/or iron.

The invention further provides a method for manufacturing a brass alloy, comprising the following steps: 1) providing copper and manganese and raising the temperature to 1000-1050 ° C, so that the copper and the manganese form a copper 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, and Forming a copper manganese zinc melt; 5) removing the slag from the copper manganese zinc melt, adding lead, aluminum, tin to the molten metal of the brass alloy material to form a molten metal; 6) raising the molten metal The temperature of the liquid is up to 1000-1050 ° C, and a boron-copper alloy and a phosphor bronze alloy are added to form a low-lead-free and flawless brass alloy melt; 7) the brass alloy melt is cast and formed 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 a fast melting rate, a fast heating rate, and the melting process can be stirred by itself. Mixing (ie affected by magnetic lines of force) and other characteristics.

The low-lead, antimony-free and antimony-free brass alloy described in the present invention is added to a certain proportion by various substances, and then processed by a high-frequency melting furnace to produce mechanical processing properties comparable to known lead-containing brass, and good It has good tensile strength, elongation and dezincification resistance and is suitable for use as a replacement for brass alloy materials known to contain high proportions of lead, such as faucets or bathroom accessories.

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‧‧‧Add lead, aluminum 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 method of manufacturing the invention 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. It is intended that the subject matter of the present invention, as well as other modifications of the features of the invention described herein, and 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 carried out in the form of as-cast according to the AS-2345-2006 specification. 12.8 g of copper chloride is added in 1000 C.C deionized water, and the measured object is placed therein for 24 hours. To measure the depth of dezincification. ◎ 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 an as-cast, using the same The 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 / per blade), the cutting depth is 0.5mm, the test bar diameter is 20mm Based on the C36000 alloy material, the relative cutting rate is obtained by measuring the cutting resistance.

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 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 and heating the copper-manganese mother alloy, and heating the temperature to between 1000 and 1050 ° C, so that the copper-manganese mother alloy forms 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 surface of the glass slag-forming agent rice on 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 to be 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, and the zinc and the copper-manganese alloy melt are sufficiently 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 the slag removing operation.

Step S112: adding lead, aluminum, tin to the copper manganese zinc melt to form a molten metal. In this step, a copper-lead mother alloy, a copper-aluminum mother alloy, and a copper-tin mother 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 low lead non-twisted and untwisted brass 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 low lead, flawless and flawless, and has good processing performance. A brass alloy that is resistant to dezincification and has 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 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 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 are tested in the as-cast form at room temperature under the conditions of cutting performance, dezincification resistance, tensile strength and elongation. The comparative samples are in the same state and the same specifications. Lead brass, 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

In Table 9-1, there are eight different compositions of Invention 9 prepared according to the above process, numbered 9001-9008, 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 10

In Table 10-1, there are five different components of the invention 10 prepared according to the above process, numbered 10001-10005, 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 11

In Table 11-1, there are eight different components of the invention 11 prepared according to the above process, numbered 11001-11008, 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 12

In Table 12-1, there are eight different compositions of Invention 12 prepared according to the above process, numbered 12001-12008, 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:

It can be seen from the above that after adding a certain ratio of various substances, a high-frequency melting furnace is used to produce a mechanical processing property comparable to that of known lead-containing brass, and good tensile strength, elongation, and anti-zinc resistance are good. It is easy to cut and has a low lead content. 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‧‧‧Add lead, aluminum and tin alloy to the melt

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

S116‧‧‧Exterminating the casting operation

Claims (12)

A brass alloy with low lead, flawless and flawless machinability, comprising: 60-65 wt% copper, 0.1-0.25 wt% lead, 0.1-0.7 wt% aluminum, 0.05-0.5, based on the total weight of the brass alloy. Wt% tin, the rest is zinc. The brass alloy having low lead-free and flawless machinability as described in claim 1 further comprises 0.05-0.5 wt% of manganese, and/or 0.05-0.3 wt%, based on the total weight of the brass alloy. phosphorus. The brass alloy having low lead-free and flawless machinability as described in claim 1 further comprises at least one selected from the group consisting of phosphorus in an amount of 0.05-0.3% by weight based on the total weight of the brass alloy, 0.05-0.5 wt%. Manganese, 0.001-0.01% by weight of boron. The brass alloy having low lead-free and flawless machinability as described in claim 1 further comprises 0.05-0.3 wt% of phosphorus, 0.05-0.5 wt% of manganese, and 0.001-0.01% by weight of boron. A brass alloy having low lead-free, flawless and machinable properties as described in claim 4, 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 wt% or less of chromium, and/or 0.25 wt% or less of iron. The brass alloy having low lead-free and flawless machinability as described in claim 4, wherein the total content of the manganese, aluminum, tin, phosphorus and boron does not exceed 2wt of the total weight of the brass alloy. %. The brass alloy having low lead-free and flawless machinability as described in claim 6 wherein the total content of the manganese, aluminum, tin, phosphorus and boron is not less than the total weight of the brass alloy. 0.1 wt%. A brass alloy with low lead, flawless and flawless machinability, comprising: 60-65 wt% of copper, 0.1-0.25 wt% of lead, and two or more of brass alloys. 0.1-0.7 wt% aluminum, 0.05-0.5 wt% tin, 0.05-0.3 wt% phosphorus, 0.05-0.5 wt% manganese, 0.001-0.01% by weight of boron, the balance being zinc. A brass alloy having low lead-free, flawless and machinable properties as described in claim 8 of the patent application, 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 wt% or less of chromium, and/or 0.25 wt% or less of iron A brass alloy with low lead, flawless and flawless machinability, comprising: 60-65 wt% copper, 0.1-0.25 wt% lead, 0.05-0.5 wt% tin, 0.05-0.3, based on the total weight of the brass alloy. The wt% of phosphorus, the rest is zinc. The brass alloy having low lead-free and flawless machinability as described in claim 10, further comprising two or more kinds of aluminum selected from the group consisting of 0.1-0.7 wt% of the total weight of the brass alloy, 0.05-0.5 Wt% manganese, 0.001-0.01 wt% boron. The low-lead, flawless and non-defective brass alloy described in claim 11 further includes unavoidable impurities, including nickel which is less than 0.25 wt% of the total weight of the brass alloy, and/or Or 0.15 wt% or less of chromium, and/or 0.25 wt% or less of iron.