CN107876715B - Production method of dezincification-resistant lead-free cast brass ingot - Google Patents
Production method of dezincification-resistant lead-free cast brass ingot Download PDFInfo
- Publication number
- CN107876715B CN107876715B CN201711176371.5A CN201711176371A CN107876715B CN 107876715 B CN107876715 B CN 107876715B CN 201711176371 A CN201711176371 A CN 201711176371A CN 107876715 B CN107876715 B CN 107876715B
- Authority
- CN
- China
- Prior art keywords
- copper
- raw materials
- casting
- tractor
- ingot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/004—Copper alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the field of copper alloy for kitchen and bathroom industry, and provides a production method of a dezincification-resistant lead-free cast brass ingot with good dezincification corrosion resistance, high strength and good processing performance, which comprises the step of smelting and then casting the following raw materials of, by mass, Cu 61-63%, Bi0.5-0.9%, As0.07-0.12%, Al0.5-0.8%, Sn0.08-0.24%, Pb < 0.1%, and the balance of Zn and impurities with the total amount not more than 0.25% into the brass ingot.
Description
Technical Field
The invention relates to the field of copper alloy for kitchen and bathroom industry, in particular to a production method of a dezincification-resistant lead-free cast brass ingot.
Background
The lead brass (common trademark is HPb 59-1) is the preferred copper alloy material for bathroom and kitchen hardware because of good casting, cutting, grinding and polishing and mechanical properties, and has wide application. The Zn content of the brass exceeds 36 percent, dezincification corrosion is easy to occur in use, and the service life of the hardware product in the toilet and kitchen is directly influenced particularly when the brass is used under the marine climate condition. As2345-2006 & lt & gt Dezincification resistance of copper alloys & gt, Australia has set that the Dezincification layer of a brass casting must not exceed 100 μm. However, it has been found that the most effective and economical method for suppressing dezincification corrosion of brass, which is required for general lead brass (whether processed copper or cast copper), is to add alloy elements, such as arsenic, boron, antimony, phosphorus, aluminum, etc., to brass to improve dezincification corrosion resistance. But most of the alloy elements can inhibit the dezincification corrosion resistance of the single-phase brass but do not play a role in the dual-phase brassThe effect is not obvious or obvious. The HPb59-1 belongs to two-phase brass, and researches show that Pb in the brass can not only improve the cutting performance, but also can be used as Pb2+Form and Cl in solution-、SO42-Plasma formation of PbCl2、PbSO4And the like passivate the film to prevent dezincification corrosion thereof from proceeding.
However, lead in lead brass exists in elemental form in the substrate and the formation of lead from the elemental lead in the course of use of the resulting water-exposed article. The harm of lead pollution is well known, the research on the lead-free-cutting brass in the field of bathroom industry is great, and the lead-free brass which is relatively mature in application is mainly bismuth brass and silicon brass. California AB 1953 specifies that Pb equivalent in sanitary appliances and valves is less than 0.25wt%, i.e., lead-free. However, as the lead content is reduced, the dezincification corrosion resistance of the two-phase brass is weakened.
Therefore, under the condition of lead-free components which reach the processing performance of lead brass, the dezincification corrosion resistance of the lead-free brass casting rod is improved, and the method becomes a key technology for expanding the application range of the lead-free brass.
Disclosure of Invention
Aiming at the problems, the invention provides a production method of a dezincification-resistant lead-free cast brass ingot with good dezincification corrosion resistance, high strength and good processing performance.
In order to solve the technical problem, the invention adopts the following scheme: a production method of a dezincification-resistant lead-free casting brass ingot comprises the following steps of smelting and casting raw materials, by mass, including, Cu 61-63%, Bi0.5-0.9%, As0.07-0.12%, Al0.5-0.8%, Sn0.08-0.24%, Pb < 0.1%, and the balance of Zn and impurities with the total amount not greater than 0.25% into a brass ingot, wherein the step of casting the brass ingot comprises the following steps:
1) firstly adding 150-300 kg of pure red copper rice in a cored power frequency furnace, wherein the total addition amount of the pure red copper rice in the power frequency furnace is 7.5-15% of the total raw materials, pressing preheated tin ingots accounting for 0.08-0.24% of the total raw materials, bismuth ingots accounting for 0.5-0.9% of the total raw materials and aluminum ingots accounting for 0.5-0.8% of the total raw materials when the pure red copper rice is in a semi-molten state, fully stirring and standing for 10 min;
2) adding a red copper plate required by the furnace ingredients, wherein the red copper plate is standard cathode copper, and the addition amount of the red copper plate is required to ensure that the Cu content in the total raw materials reaches 61-63%; when the melting amount of the copper plate reaches 70-80%, uniformly scattering 1.5kg of environment-friendly slag removal flux on the surface of the copper liquid, pressing in preheated 0# zinc ingots accounting for 34.84-38% of the total raw materials, and fully and uniformly stirring after melting;
3) adding weighed and preheated copper-arsenic intermediate alloy, adding the weighed and preheated copper-arsenic intermediate alloy according to the proportion that As accounts for 0.07-0.12% of the total raw materials, uniformly scattering 1kg of environment-friendly slag removal flux on the surface of the copper liquid after melting and stirring, and standing for 10-15 min at 1020 ℃;
4) sampling and detecting components, and adjusting the components according to component detection data;
5) flaming, stirring, ash removing and slag removing, wherein in the ash removing process, a copper ash spoon is required to stay at a furnace mouth for about 20s when removing ash from copper water so as to ensure that the copper water in the ash completely flows into a crucible;
6) pressing weighed refiner into copper liquid by using a bell jar, fully stirring, and standing for 15-20 min at 1020 ℃, wherein the refiner is a combination of K salt or sodium salt taking F, Si, O, Mn and Ti as one or more negative valence acid radical ions, and the relation between the addition amount and the total raw materials is 75-125 g/T;
7) carrying out tests on fluidity, crystallization state, number and distribution of impurity points of cast ingots in a polished state and the like, if the roughness of the inner surface of the light cup, the number of impurity points of the polished surface and the crystal structure form meet the requirements, casting, otherwise, continuously carrying out refining treatment until the refining requirement is met, and obtaining copper liquid with Pb less than 0.1%;
8) pouring copper liquid which meets the refining requirement and contains less than 0.1% of Pb into a heat preservation furnace, installing a crystallizer on a copper water outlet of the heat preservation furnace, and correcting the center by using a traction rod during installation so as to ensure that the copper liquid is coaxial with a tractor;
9) the method comprises the steps of raising the temperature of copper water in a heat preservation furnace to a small flame spray, enabling the industrial voltage to be 250-300V, simultaneously feeding a small amount of cooling water into a water cooling jacket, enabling the water amount to be 2.5L/s, starting to use a tractor for casting after preparation work is done, slowing the speed of the tractor to 40-60 mm/min when casting is started, reducing the voltage to 180-240V after casting is finished, regulating the speed of the tractor to 60-80 mm/min, turning on a cooling water switch, enabling the water amount to be 5.0L/s, regulating the speed of the tractor to 80-100 mm/min when the length of a cast copper ingot reaches more than one meter, meeting technological requirements, and synchronously sawing the tractor to the length required to be sawn after casting is normal so as to achieve continuous production of the cast brass ingot.
The further improvement is that: the temperature of the flaming in the step 5) is 1050-1150 ℃.
By adopting the technical scheme, the invention has the beneficial effects that: the invention adopts the specific component proportion and the specific preparation method to prepare the lead-cast brass ingot, strictly controls the adding sequence of each raw material in the production process, avoids the burning loss of the effective components of each raw material, obtains the accumulation effect by selecting the most appropriate adding amount, and ensures that the dezincification corrosion resistance of the lead-free bismuth arsenic lead-cast brass ingot is improved under the condition of lead-free components and lead brass processability. Wherein, the Cu component in the formula is slightly higher, the zinc equivalent is reduced, and the alpha phase proportion is improved; the bismuth content is reduced and the cost is saved under the condition of meeting the use performance; sn in the formula is dispersed and dissolved in a matrix in a solid solution mode, so that the movement of zinc atoms is resisted, the grain boundary of copper alloy can be strengthened, and the corrosion sensitivity of the grain boundary is greatly reduced; al not only improves the melt fluidity, but also is beneficial to an oxide film on the surface of the alloy to play a role in passivation and corrosion prevention; as improves overpotential of copper precipitation reaction, so that CuCl is easily generated on the surface of brass2The film is a continuous and uniform protective film and can exist stably, so that the dezincification corrosion reaction is retarded; the Pb content is only from impurity elements of the raw materials, so the method is environment-friendly and harmless.
In the manufacturing method, pure red copper rice is used as a crucible bottom pre-melting material, so that the melting time can be saved, the copper liquid is controlled to be in a semi-molten state, the viscosity of the copper liquid is increased, the floating of low-density raw materials is inhibited, and the element absorption rate is improved; pressing raw materials with low melting point, low density or small amount into the low-temperature copper liquid and ensuring sufficient standing time, can effectively prevent oxidation burning loss, is beneficial to full diffusion reaction of elements, is convenient for controlling components and saves production cost; the slag removing agent is added in proper smelting stage in multiple times, so that the slag removing agent can be ensured to fully adsorb the oxidized slag inclusion in the copper liquid, the failure of the slag removing agent is avoided, the copper liquid is comprehensively purified by further combining with flame spraying treatment, the distribution uniformity of effective components can be improved, the probability of forming a primary battery by slag inclusion and a base body is reduced, and the corrosion speed is reduced; the crystal grains are refined, the area of the crystal boundary is increased, the area of the copper-zinc alloy anode is reduced, and the selective preferential dissolution of zinc is prevented; the proportion of macroscopic isometric crystals in the cast ingot is increased, and adverse structure factors influencing the compactness of the cast ingot are reduced.
Drawings
FIG. 1 is a schematic representation of the macro-microstructure of dezincification resistant lead-free silicon arsenic brass;
fig. 2 is a schematic representation of the microstructure of dezincification resistant lead-free silicon arsenic brass.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and specific embodiments.
The first embodiment is as follows:
an anti-dezincification lead-free cast brass ingot is composed of the following raw materials, by mass, Cu 61%, Bi0.5%, As0.07%, Al0.5%, Sn0.08%, Pb0.06%, Zn37.75% and impurities accounting for 0.04%.
The production method of the dezincification-resistant lead-free casting brass ingot comprises the step of casting the molten brass in percentage by mass into the brass ingot, wherein the step of casting the brass ingot comprises the following steps:
1) firstly adding 150kg of pure red copper rice in a cored power frequency furnace, wherein the total addition amount of the pure red copper rice in the power frequency furnace is 7.5 percent of the total raw materials, pressing preheated tin ingots accounting for 0.08 percent of the total raw materials, bismuth ingots accounting for 0.5 percent of the total raw materials and aluminum ingots accounting for 0.5 percent of the total raw materials when the pure red copper rice is in a semi-molten state, fully stirring and standing for 10 min;
2) adding a red copper plate required by the furnace ingredients, wherein the red copper plate is standard cathode copper, and the addition amount of the red copper plate is required to ensure that the Cu content in the total raw materials reaches 61%; when the melting amount of the copper plate reaches 70-80%, uniformly scattering 1.5kg of environment-friendly slag removal flux on the surface of the copper liquid, pressing in preheated 0# zinc ingots accounting for 37.75% of the total raw materials, and fully and uniformly stirring after melting;
3) adding weighed and preheated copper-arsenic intermediate alloy, adding the weighed and preheated copper-arsenic intermediate alloy according to the proportion that As accounts for 0.07 percent of the total raw materials, uniformly scattering 1kg of environment-friendly slag removal flux on the surface of the copper liquid after melting and stirring, and standing for 10-15 min at 1020 ℃;
4) sampling and detecting components, and adjusting the components according to component detection data;
5) flaming, stirring, ash removing and slag removing, wherein in the ash removing process, a copper ash spoon is required to stay at a furnace mouth for about 20s when removing ash from copper water so as to ensure that the copper water in the ash completely flows into a crucible; the temperature of the flaming is 1050-1150 ℃;
6) pressing weighed refiner into copper liquid by using a bell jar, fully stirring, and standing for 15-20 min at 1020 ℃, wherein the refiner is a combination of K salt or sodium salt taking F, Si, O, Mn and Ti as one or more negative valence acid radical ions, and the relation between the addition amount and the total raw materials is 75-125 g/T;
7) carrying out tests on fluidity, a crystallization state, the number and distribution of impurity points of cast ingots in a polishing state and the like, if the roughness of the inner surface of the light cup, the number of impurity points of the polished surface and the crystal structure form meet the requirements, casting, otherwise, continuously carrying out refining treatment until the refining requirement is met, and obtaining copper liquid with 0.06% of Pb;
8) pouring copper liquid which meets the refining requirement and contains 0.06% of Pb into a heat preservation furnace, installing a crystallizer on a copper water outlet of the heat preservation furnace, and correcting the center by using a traction rod during installation so as to ensure that the copper liquid is coaxial with a tractor;
9) the method comprises the steps of raising the temperature of copper water in a heat preservation furnace to a small flame spray, enabling the industrial voltage to be 250-300V, simultaneously feeding a small amount of cooling water into a water cooling jacket, enabling the water amount to be 2.5L/s, starting to use a tractor for casting after preparation work is done, slowing the speed of the tractor to 40-60 mm/min when casting is started, reducing the voltage to 180-240V after casting is finished, regulating the speed of the tractor to 60-80 mm/min, turning on a cooling water switch, enabling the water amount to be 5.0L/s, regulating the speed of the tractor to 80-100 mm/min when the length of a cast copper ingot reaches more than one meter, meeting technological requirements, and synchronously sawing the tractor to the length required to be sawn after casting is normal so as to achieve continuous production of the cast brass ingot.
The invention adopts the specific component proportion and the specific preparation method to prepare the lead-casting brass ingot, strictly controls the adding sequence of each raw material in the production process, avoids the burning loss of the effective components of each raw material, obtains the accumulation effect by selecting the most appropriate adding amount, and ensures that the dezincification corrosion resistance of the lead-free lead-casting brass ingot is improved under the condition of lead-free components and reaching the lead brass processing performance. Wherein, the Cu component in the formula is slightly higher, the zinc equivalent is reduced, and the alpha phase proportion is improved; the bismuth content is reduced and the cost is saved under the condition of meeting the use performance; sn in the formula is dispersed and dissolved in a matrix in a solid solution mode, so that the movement of zinc atoms is resisted, the grain boundary of copper alloy can be strengthened, and the corrosion sensitivity of the grain boundary is greatly reduced; al not only improves the melt fluidity, but also is beneficial to an oxide film on the surface of the alloy to play a role in passivation and corrosion prevention; as improves overpotential of copper precipitation reaction, so that CuCl is easily generated on the surface of brass2The film is a continuous and uniform protective film and can exist stably, so that the dezincification corrosion reaction is retarded; the Pb content is only from impurity elements of the raw materials, so the method is environment-friendly and harmless.
In the manufacturing method, pure red copper rice is used as a crucible bottom pre-melting material, so that the melting time can be saved, the copper liquid is controlled to be in a semi-molten state, the viscosity of the copper liquid is increased, the floating of low-density raw materials is inhibited, and the element absorption rate is improved; pressing raw materials with low melting point, low density or small amount into the low-temperature copper liquid and ensuring sufficient standing time, can effectively prevent oxidation burning loss, is beneficial to full diffusion reaction of elements, is convenient for controlling components and saves production cost; the slag removing agent is added in proper smelting stage in multiple times, so that the slag removing agent can be ensured to fully adsorb the oxidized slag inclusion in the copper liquid, the failure of the slag removing agent is avoided, the copper liquid is comprehensively purified by further combining with flame spraying treatment, the distribution uniformity of effective components can be improved, the probability of forming a primary battery by slag inclusion and a base body is reduced, and the corrosion speed is reduced; the crystal grains are refined, the area of the crystal boundary is increased, the area of the copper-zinc alloy anode is reduced, and the selective preferential dissolution of zinc is prevented; the proportion of macroscopic isometric crystals in the cast ingot is increased, and adverse structure factors influencing the compactness of the cast ingot are reduced.
As shown in fig. 1 and 2, the macroscopic equiaxed crystal area of the cross section of the ingot reaches more than 95%; the alpha phase and the beta phase are polygonal and are not in a thick needle shape or a blade shape, so that stress concentration generated when stress is applied is avoided; the alpha and beta phases are fine and uniform and have an average size of less than 45 μm. The hardness of the dezincification-resistant lead-free bismuth arsenic brass is about 86HRB, which is higher than that of cast HPb59-1 (about 80-82 HRB), and the average dezincification layer depth is 84 μm.
Example two:
an anti-dezincification lead-free cast brass ingot is composed of the following raw materials, by mass, Cu 62%, Bi0.7%, As0.1%, Al0.7%, Sn0.15%, Pb0.09%, Zn36.12% and impurities accounting for 0.14% of the total.
The production method of the dezincification-resistant lead-free casting brass ingot comprises the step of casting the molten brass in percentage by mass into the brass ingot, wherein the step of casting the brass ingot comprises the following steps:
1) firstly adding 200kg of pure red copper rice in a cored power frequency furnace, wherein the total addition amount of the pure red copper rice in the power frequency furnace is 10 percent of the total raw materials, pressing preheated tin ingots accounting for 0.15 percent of the total raw materials, 0.7 percent of bismuth ingots and aluminum ingots accounting for 0.7 percent of the total raw materials when the pure red copper rice is in a semi-molten state, fully stirring, and standing for 10 min;
2) adding a red copper plate required by the furnace ingredients, wherein the red copper plate is standard cathode copper, and the addition amount of the red copper plate is required to ensure that the Cu content in the total raw materials reaches 62%; when the melting amount of the copper plate reaches 70-80%, uniformly scattering 1.5kg of environment-friendly slag removal flux on the surface of the copper liquid, pressing in preheated 0# zinc ingots accounting for 36.12% of the total raw materials, and fully and uniformly stirring after melting;
3) adding weighed and preheated copper-arsenic intermediate alloy, adding the weighed and preheated copper-arsenic intermediate alloy according to the proportion that As accounts for 0.1 percent of the total raw materials, uniformly scattering 1kg of environment-friendly slag removal flux on the surface of the copper liquid after melting and stirring, and standing for 10-15 min at 1020 ℃;
4) sampling and detecting components, and adjusting the components according to component detection data;
5) flaming, stirring, ash removing and slag removing, wherein in the ash removing process, a copper ash spoon is required to stay at a furnace mouth for about 20s when removing ash from copper water so as to ensure that the copper water in the ash completely flows into a crucible;
6) pressing weighed refiner into the copper liquid by using a bell jar, fully stirring, and standing for 15-20 min at 1020 ℃, wherein the refiner is a combination of K salt or sodium salt taking F, Si, O, Mn and Ti as one or more negative valence acid radical ions; the relation between the addition amount and the total raw materials is 75-125 g/T;
7) carrying out tests on fluidity, a crystalline state, the number and distribution of impurity points of cast ingots in a polished state and the like, if the roughness of the inner surface of the light cup, the number of impurity points of the polished surface and the crystalline structure form meet the requirements, casting, otherwise, continuously carrying out refining treatment until the refining requirement is met, and obtaining copper liquid with the Pb of 0.09%;
8) pouring copper liquid which meets the refining requirement and contains 0.09% of Pb into a heat preservation furnace, installing a crystallizer on a copper water outlet of the heat preservation furnace, and correcting the center by using a traction rod during installation so as to ensure that the copper liquid is coaxial with a tractor;
9) the method comprises the steps of raising the temperature of copper water in a heat preservation furnace to a small flame spray, enabling the industrial voltage to be 250-300V, simultaneously feeding a small amount of cooling water into a water cooling jacket, enabling the water amount to be 2.5L/s, starting to use a tractor for casting after preparation work is done, slowing the speed of the tractor to 40-60 mm/min when casting is started, reducing the voltage to 180-240V after casting is finished, regulating the speed of the tractor to 60-80 mm/min, turning on a cooling water switch, enabling the water amount to be 5.0L/s, regulating the speed of the tractor to 80-100 mm/min when the length of a cast copper ingot reaches more than one meter, meeting technological requirements, and synchronously sawing the tractor to the length required to be sawn after casting is normal so as to achieve continuous production of the cast brass ingot.
Example three:
an anti-dezincification lead-free cast brass ingot is composed of the following raw materials, by mass, Cu 63%, Bi0.9%, As0.12%, Al 0.8%, Sn0.24%, Pb0.02%, Zn34.84% and impurities accounting for 0.08% of the total.
The production method of the dezincification-resistant lead-free casting brass ingot comprises the step of casting the molten brass in percentage by mass into the brass ingot, wherein the step of casting the brass ingot comprises the following steps:
1) adding 300kg of pure red copper rice in a cored power frequency furnace, wherein the total addition amount of the pure red copper rice in the power frequency furnace is 15 percent of the total raw materials, pressing preheated tin ingots accounting for 0.24 percent of the total raw materials, bismuth ingots accounting for 0.9 percent of the total raw materials and aluminum ingots accounting for 0.8 percent of the total raw materials when the pure red copper rice is in a semi-molten state, fully stirring and standing for 10 min;
2) adding a red copper plate required by the furnace ingredients, wherein the red copper plate is standard cathode copper, and the addition amount of the red copper plate is required to ensure that the Cu content in the total raw materials reaches 63%; when the melting amount of the copper plate reaches 70-80%, uniformly scattering 1.5kg of environment-friendly slag removal flux on the surface of the copper liquid, pressing in preheated 0# zinc ingots accounting for 34.84% of the total raw materials, and fully and uniformly stirring after melting;
3) adding weighed and preheated copper-arsenic intermediate alloy, adding the weighed and preheated copper-arsenic intermediate alloy according to the proportion that As accounts for 0.12 percent of the total raw materials, uniformly scattering 1kg of environment-friendly slag removal flux on the surface of the copper liquid after melting and stirring, and standing for 10-15 min at 1020 ℃;
4) sampling and detecting components, and adjusting the components according to component detection data;
5) flaming, stirring, ash removing and slag removing, wherein in the ash removing process, a copper ash spoon is required to stay at a furnace mouth for about 20s when removing ash from copper water so as to ensure that the copper water in the ash completely flows into a crucible;
6) pressing weighed refiner into the copper liquid by using a bell jar, fully stirring, and standing for 15-20 min at 1020 ℃, wherein the refiner is a combination of K salt or sodium salt taking F, Si, O, Mn and Ti as one or more negative valence acid radical ions; the relation between the addition amount and the total raw materials is 75-125 g/T;
7) carrying out tests on fluidity, crystalline state, number and distribution of impurity points of cast ingots in a polished state and the like, if the roughness of the inner surface of the light cup, the number of impurity points of the polished surface and the crystalline structure form meet the requirements, casting, otherwise, continuing refining until the refining requirement is met, and obtaining copper liquid with 0.02% of Pb;
8) pouring copper liquid which meets the refining requirement and contains 0.02 percent of Pb into a heat preservation furnace, installing a crystallizer on a copper water outlet of the heat preservation furnace, and correcting the center by using a traction rod during installation so as to ensure that the copper liquid is coaxial with a tractor;
9) the method comprises the steps of raising the temperature of copper water in a heat preservation furnace to a small flame spray, enabling the industrial voltage to be 250-300V, simultaneously feeding a small amount of cooling water into a water cooling jacket, enabling the water amount to be 2.5L/s, starting to use a tractor for casting after preparation work is done, slowing the speed of the tractor to 40-60 mm/min when casting is started, reducing the voltage to 180-240V after casting is finished, regulating the speed of the tractor to 60-80 mm/min, turning on a cooling water switch, enabling the water amount to be 5.0L/s, regulating the speed of the tractor to 80-100 mm/min when the length of a cast copper ingot reaches more than one meter, meeting technological requirements, and synchronously sawing the tractor to the length required to be sawn after casting is normal so as to achieve continuous production of the cast brass ingot.
Based on the technical scheme: the dezincification-resistant lead-free bismuth arsenic-free brass can achieve the purpose within the following weight component proportion range: cu 61-63%, Bi0.5-0.9%, As0.07-0.12%, Al0.5-0.8%, Sn0.08-0.24%, Pb < 0.1%, and the balance of Zn and impurities with the total amount not more than 0.35%.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (2)
1. A production method of a dezincification-resistant lead-free cast brass ingot is characterized by comprising the following steps: the method comprises the following steps of smelting and casting raw materials, by mass, including, Cu 61-63%, Bi0.5-0.9%, As0.07-0.12%, Al0.5-0.8%, Sn0.08-0.24%, Pb < 0.1%, and the balance Zn and impurities with the total amount not greater than 0.25% into a brass ingot, wherein the step of casting the brass ingot comprises:
1) firstly adding 150-300 kg of pure red copper rice in a cored power frequency furnace, wherein the total addition amount of the pure red copper rice in the power frequency furnace is 7.5-15% of the total raw materials, pressing preheated tin ingots accounting for 0.08-0.24% of the total raw materials, bismuth ingots accounting for 0.5-0.9% of the total raw materials and aluminum ingots accounting for 0.5-0.8% of the total raw materials when the pure red copper rice is in a semi-molten state, fully stirring and standing for 10 min;
2) adding a red copper plate required by the furnace ingredients, wherein the red copper plate is standard cathode copper, and the addition amount of the red copper plate is required to ensure that the Cu content in the total raw materials reaches 61-63%; when the melting amount of the copper plate reaches 70-80%, uniformly scattering 1.5kg of environment-friendly slag removal flux on the surface of the copper liquid, pressing in preheated 0# zinc ingots accounting for 34.84-38% of the total raw materials, and fully and uniformly stirring after melting;
3) adding weighed and preheated copper-arsenic intermediate alloy, adding the weighed and preheated copper-arsenic intermediate alloy according to the proportion that As accounts for 0.07-0.12% of the total raw materials, uniformly scattering 1kg of environment-friendly slag removal flux on the surface of the copper liquid after melting and stirring, and standing for 10-15 min at 1020 ℃;
4) sampling and detecting components, and adjusting the components according to component detection data;
5) flaming, stirring, ash removing and slag removing, wherein in the ash removing process, a copper ash spoon is required to stay at a furnace mouth for 20s when removing ash from copper water so as to ensure that the copper water in the ash completely flows into a crucible;
6) pressing weighed refiner into copper liquid by using a bell jar, fully stirring, and standing for 15-20 min at 1020 ℃, wherein the refiner is a combination of K salt or sodium salt taking F, Si, O, Mn and Ti as one or more negative valence acid radical ions, and the relation between the addition amount and the total raw materials is 75-125 g/T;
7) carrying out fluidity, crystalline state and polished state ingot casting impurity point quantity and distribution inspection, if the roughness of the inner surface of the light cup, the impurity point number of the polished surface and the crystalline structure form meet the requirements, casting, otherwise, continuing refining treatment until the refining requirement is met, and obtaining copper liquid with Pb less than 0.1%;
8) pouring copper liquid which meets the refining requirement and contains less than 0.1% of Pb into a heat preservation furnace, installing a crystallizer on a copper water outlet of the heat preservation furnace, and correcting the center by using a traction rod during installation so as to ensure that the copper liquid is coaxial with a tractor;
9) the method comprises the steps of raising the temperature of copper water in a heat preservation furnace to a small flame spray, enabling the industrial voltage to be 250-300V, simultaneously feeding a small amount of cooling water into a water cooling jacket, enabling the water amount to be 2.5L/s, starting to use a tractor for casting after preparation work is done, slowing the speed of the tractor to 40-60 mm/min when casting is started, reducing the voltage to 180-240V after casting is finished, regulating the speed of the tractor to 60-80 mm/min, turning on a cooling water switch, enabling the water amount to be 5.0L/s, regulating the speed of the tractor to 80-100 mm/min when the length of a cast copper ingot reaches more than one meter, meeting technological requirements, and synchronously sawing the tractor to the length required to be sawn after casting is normal so as to achieve continuous production of the cast brass ingot.
2. The method for producing a dezincification-resistant lead-free cast brass ingot according to claim 1, wherein: the temperature of the flaming in the step 5) is 1050-1150 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711176371.5A CN107876715B (en) | 2017-11-22 | 2017-11-22 | Production method of dezincification-resistant lead-free cast brass ingot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711176371.5A CN107876715B (en) | 2017-11-22 | 2017-11-22 | Production method of dezincification-resistant lead-free cast brass ingot |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107876715A CN107876715A (en) | 2018-04-06 |
| CN107876715B true CN107876715B (en) | 2020-11-20 |
Family
ID=61778257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711176371.5A Active CN107876715B (en) | 2017-11-22 | 2017-11-22 | Production method of dezincification-resistant lead-free cast brass ingot |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107876715B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111101017B (en) * | 2019-12-31 | 2021-04-27 | 黑龙江北鸥卫浴用品有限公司 | Corrosion-resistant low-lead brass alloy, brass casting and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH049253A (en) * | 1990-04-26 | 1992-01-14 | Mitsubishi Electric Corp | Production of copper alloy |
| CN103805806B (en) * | 2013-11-12 | 2016-03-09 | 龙岩市鸿航金属科技有限公司 | The formula of anti-dezincify pressing drawing brazed copper tube and production method thereof |
| CN106119599A (en) * | 2016-06-23 | 2016-11-16 | 龙岩市鸿航金属科技有限公司 | Lead-free free-cutting draws the production method of casting rod |
| CN105925837A (en) * | 2016-06-23 | 2016-09-07 | 龙岩市鸿航金属科技有限公司 | Anti-dezincification free-cutting brass rod and production method thereof |
-
2017
- 2017-11-22 CN CN201711176371.5A patent/CN107876715B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107876715A (en) | 2018-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5116976B2 (en) | Raw brass alloy for semi-fusion gold casting | |
| CN104480344B (en) | A kind of phosphorous easily-cut silicon brass alloy and preparation method thereof | |
| TWI550106B (en) | Low lead free bismuth no silicon brass alloy | |
| CN103509967B (en) | A kind of gravitational casting special DZR environment-friendly yellow brass alloy ingot and manufacture craft thereof | |
| CN105925837A (en) | Anti-dezincification free-cutting brass rod and production method thereof | |
| CN107746987B (en) | Preparation method of dezincification-resistant lead-free bismuth arsenic brass tube | |
| CN107619966B (en) | Dezincification-resistant lead-free bismuth arsenic-free brass and preparation method thereof | |
| CN112030032A (en) | Cu-Cr-Ti-Zr alloy and copper strip preparation method | |
| CN106119599A (en) | Lead-free free-cutting draws the production method of casting rod | |
| CN107876715B (en) | Production method of dezincification-resistant lead-free cast brass ingot | |
| CN107805736B (en) | Preparation method of dezincification-resistant lead-free bismuth-arsenic extruded brass bar | |
| TWI550105B (en) | Lead - free bismuth - free silicon - brass alloy | |
| CN107855481B (en) | Production method of dezincification-resistant lead-free low-silicon lead-cast arsenic brass ingot | |
| CN107805737B (en) | Preparation method of dezincification-resistant lead-free low-silicon extruded arsenic brass rod | |
| CN110273082B (en) | Silicon-bismuth lead-free casting brass alloy and preparation method thereof | |
| CN107841651B (en) | Preparation method of dezincification-resistant lead-free low-silicon arsenic brass tube | |
| WO2007094265A1 (en) | Raw material phosphor bronze alloy for casting of semi-molten alloy | |
| CN107841650B (en) | Anti-dezincification lead-free low-silicon arsenic brass and preparation method thereof | |
| CN104726743B (en) | Brass alloys and its manufacture method | |
| CN105886835A (en) | Nonleaded free-cutting silicon-bismuth brass and preparation method thereof | |
| CN107164652B (en) | Lead-free-cutting silicon-magnesium-phosphorus brass alloy and preparation method thereof | |
| CN113337753B (en) | Method for preparing B-level copper ingot through horizontal continuous casting | |
| KR20120042483A (en) | Brass alloy with corrosion resistance containing little lead | |
| JPH0135057B2 (en) | ||
| CN117965947A (en) | Leadless copper alloy for casting, preparation method thereof and product cast from leadless copper alloy for casting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |