WO2014166022A1

WO2014166022A1 - New lead-free copper-based alloy pipe and preparation method therefor

Info

Publication number: WO2014166022A1
Application number: PCT/CN2013/000798
Authority: WO
Inventors: 孙飞; 赵勇
Original assignee: 苏州金仓合金新材料有限公司
Priority date: 2013-04-10
Filing date: 2013-06-28
Publication date: 2014-10-16
Also published as: CN103194642B; CN103194642A

Abstract

A new lead-free copper-based alloy pipe and a preparation method therefor. The alloy pipe consists of the following ingredients: 50 to 54% of copper, 0.5 to 1.5% of bismuth, 2 to 3% of aluminum, 1 to 2% of tin, 0.05 to 0.8% of phosphorus, and a remainder zinc. On the basis that the cost is not increased, the lead-free copper-based alloy pipe meets lead-free and environmentally friendly requirements, and also ensures that the material meets requirements on cutting performance and mechanical and physical performance during application.

Description

Lead-free copper-based alloy tube and preparation method thereof

TECHNICAL FIELD The present invention relates to the field of alloy tubing, and more particularly to a novel lead-free copper-based alloy tube and a method of preparing the same. Background technique

Say

Lead brass has excellent cold workability and machinability, combined with good mechanical and physical properties, and low cost, and is widely used in instruments, watches, electronics, electrical appliances, household hardware, water supply systems and other industries. However, lead and its compounds are one of the chemicals that seriously endanger human life and the natural environment. Lead in alloys can easily escape or escape from the matrix during use. Lead in industrial wastes penetrates into groundwater systems, and various Forms of lead enter the animal or human food chain through various means, endangering human health and affecting the environment. The United States, Japan, the European Union and all countries have put forward corresponding restrictions and prohibitions. Since July 1, 2006, the electronic and electrical products and mink and hardware equipment exported to these countries and regions should meet the required lead content. Therefore, the development of lead-free brass and its products has become a major issue facing the metal materials industry today. SUMMARY OF THE INVENTION The object of the present invention is to provide a novel lead-free copper-based alloy tube and a preparation method thereof, and the invention can satisfy the requirements of lead-free environmental protection performance while ensuring the material at the same time without increasing the cost. Requirements for cutting performance and mechanical physical properties in the application. In order to achieve the above object, the technical solution adopted by the present invention is as follows: A novel lead-free copper-based alloy tube is composed of the following components: copper which accounts for 50-54% of the total weight of the alloy tube, and accounts for 0.5-1.5 of the total weight of the alloy tube. % of yttrium, accounting for 2-3% of the total weight of the alloy tube, 1-2% of the total weight of the alloy tube, accounting for 0.05-0.8% of the total weight of the alloy tube, and the balance is zinc. Preferably, it is composed of the following components: copper which accounts for 50% of the total weight of the alloy pipe, 铋 which accounts for 0.5% of the total weight of the alloy pipe, 2% of the total weight of the alloy pipe, and 1% of the total weight of the alloy pipe, accounting for The total weight of the alloy tube is 0.05% phosphorus, and the balance is zinc.

Preferably, it is composed of the following components: copper accounting for 54% of the total weight of the alloy tube, bismuth accounting for 1.5% of the total weight of the alloy tube, aluminum accounting for 3% of the total weight of the alloy tube, and tin accounting for 2% of the total weight of the alloy tube, accounting for The total weight of the alloy tube is 0.8% phosphorus, and the balance is zinc.

Preferably, it is composed of the following components: copper which accounts for 52% of the total weight of the alloy tube, 铋 which accounts for 1% of the total weight of the alloy tube, aluminum which accounts for 2.5% of the total weight of the alloy tube, and tin which accounts for 1.5% of the total weight of the alloy tube, accounting for The total weight of the alloy tube is 0.375% phosphorus, and the balance is zinc.

Preferably, the copper may be electrolytic copper.

The invention provides a novel lead-free copper-based alloy tube preparation method, comprising the following steps:

1) Place copper, tantalum, tin, aluminum, phosphorus and zinc in a power frequency electric furnace according to the ratio, heat to 1200-1250 °C, and keep warm to 1150 °C after complete melting;

2) After thoroughly stirring the completely molten alloy liquid with a graphite rod, it is covered with high-purity flaky graphite powder to prevent oxidation thereof, and the thickness is 12-15 cm, and is kept warm;

3) After 1-1.5 hours of heat preservation, the sample taken out from the furnace is subjected to component inspection by a spectrometer to determine that the alloy composition is within the specified range;

4) Reheating to 1200 °C, turning on the vibration device of the power frequency electric furnace, and casting into a solid blank alloy pipe with an outer diameter of 200 mm, an inner diameter of 100 mm and a length of 500 mm by horizontal continuous casting;

5) Surface processing of the blank alloy tube by a copper ingot milling machine, processing into an alloy tube having a diameter of 195 mm, an inner diameter of 105 mm, and a length of 500 mm;

6) annealing, annealing the alloy tube with a box annealing furnace, and annealing temperature is 100-150 ° C, annealing time is 1-1.5 hours;

7) Extrusion, extrusion with 2000 tons of double action extruder, and the heating temperature of the alloy ingot is 200-250 °C, the extrusion temperature is 300 °C, the extrusion speed is 4.5mm/s, the alloy after extrusion The tube has a diameter of 155 mm and an inner diameter of 120 mm; 8) Cutting and turning, the extruded alloy pipe is cut by high-precision cutting machine, cut into alloy pipe with length of 500mm and deburred, and the surface is turned by lathe to make the diameter of 150mm and the inner diameter is 125mm _;

9) Packing into the warehouse.

Further, the number of component inspections in the step 3) is three.

Further, the spectrometer in the step 3) is a Spike direct reading spectrometer.

The invention has the beneficial effects that: the invention adopts various elements such as bismuth, aluminum, tin, phosphorus and the like to be added to copper and zinc, and the interaction between the metal elements in the smelting process enables the new alloy to replace the lead-containing one. Brass rod. On the basis of not increasing the cost, it not only meets the requirements of lead-free environmental performance, but also ensures the cutting performance and mechanical physical properties of the material in the application. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in conjunction with the embodiments, but it is not intended to limit the scope of application of the present invention.

Example 1

A novel lead-free copper-based alloy tube consisting of the following components: copper, which accounts for 50% of the total weight of the alloy tube, 铋, which accounts for 0.5% of the total weight of the alloy tube, and 2% of the total weight of the alloy tube, accounting for the total alloy tube 1% tin, accounting for 0.05% of the total weight of the alloy tube, the balance is zinc. According to the above ratio, the electrolytic copper, bismuth, tin, aluminum, phosphorus and zinc are placed in a power frequency electric furnace, heated to 1200 degrees to 1250 degrees, completely melted and then kept to 1150 degrees; then the graphite rod is used to fully melt the completely molten alloy liquid. After stirring, it is covered with high-purity flaky graphite powder to prevent oxidation thereof, and the high-purity flaky graphite powder has a thickness of about 12-15 cm and is kept warm; after 1-1.5 hours of incubation, it is imported from Germany. The Parker direct reading spectrometer performs three component tests on the samples taken from the furnace to determine that the alloy composition is within the specified range. After the test, the alloy liquid is reheated to 1200 degrees, and the vibration device of the power frequency electric furnace is turned on. Continuous casting method is cast into solid blank alloy pipe with outer diameter of 200mm±lmm, inner diameter of 100mm±lmm and length of 500mm±lmm; surface machining of blank alloy pipe by copper ingot milling machine, processing to surface smooth diameter of 195mm±lmm , inner diameter is 105mm ± lmm, length is 500mm ± lmm Alloy tube; annealed, the surface treated copper rod is annealed in a box annealing furnace, and the annealing temperature is 100-150 degrees, the annealing time is 1-1.5 hours; then the 2000 tons double-action extruder is used for extrusion. Pressure, and the heating temperature of the alloy ingot is 200-250 degrees, the extrusion temperature is 300 degrees, the extrusion speed is V=4.5mm/s, the diameter of the copper rod after extrusion is 155mm±lmm, and the inner diameter is 120mm ± lmm Finally, the cutting and turning, the extruded alloy pipe is cut with a high-precision cutting machine, cut into a length of 500mm ± lmm and deburred, and the surface is turned by a high-precision lathe to make the diameter 150mm ± lmm The finished product with an inner diameter of 125mm ± lmm is packed into the warehouse.

Compared with the existing lead-containing alloy tubes, the cutting performance is good, the workability is good, the wear resistance is good, the preparation process is simple, the cost is low, and the environment is not polluted.

Example 2

A novel lead-free copper-based alloy tube consisting of the following components: copper, which accounts for 54% of the total weight of the alloy tube, 铋, which accounts for 1.5% of the total weight of the alloy tube, and 3% of the total weight of the alloy tube, which accounts for the total alloy tube. The weight is 2% tin, which accounts for 0.8% of the total weight of the alloy tube, and the balance is zinc. According to the above ratio, the electrolytic copper, bismuth, tin, aluminum, phosphorus and zinc are placed in a power frequency electric furnace, heated to 1200 degrees to 1250 degrees, completely melted and then kept to 1150 degrees; then the graphite rod is used to fully melt the completely molten alloy liquid. After stirring, it is covered with high-purity flaky graphite powder to prevent oxidation thereof, and the high-purity flaky graphite powder has a thickness of about 12-15 cm and is kept warm; after 1-1.5 hours of incubation, it is imported from Germany. The Parker direct reading spectrometer performs three component tests on the samples taken from the furnace to determine that the alloy composition is within the specified range. After the test, the alloy liquid is reheated to 1200 degrees, and the vibration device of the power frequency electric furnace is turned on. The continuous casting method is cast into a solid blank alloy pipe with an outer diameter of 200 mm, an inner diameter of 100 mm and a length of 500 mm. The surface of the blank alloy pipe is machined by a copper ingot milling machine, and the surface is smooth and clean with a diameter of 195 mm, an inner diameter of 105 mm, and a length of 500 mm. Alloy tube; annealed, the surface treated copper rod is annealed in a box annealing furnace, and the annealing temperature is 100-150 degrees, retreating The time is 1-1.5 hours; after that, it is extruded by a 2000-ton double-action extruder, and the heating temperature of the alloy ingot is 200-250 degrees, the extrusion temperature is 300 degrees, and the extrusion speed is V=4.5 mm/s. The finished copper rod has a diameter of 155mm and an inner diameter of 120mm. The final cutting and turning, which is about to be extruded The alloy pipe is cut by a high-precision cutting machine, cut into a length of 500mm and deburred, and surface-turned with a high-precision lathe to make it into a finished product with a diameter of 150mm and an inner diameter of 125mm. Compared with the existing lead-containing alloy tubes, the cutting performance is good, the workability is good, the wear resistance is good, the preparation process is simple, the cost is low, and the environment is not polluted.

Example 3

A new lead-free copper-based alloy tube consisting of the following components: copper, which accounts for 52% of the total weight of the alloy tube, 铋, which accounts for 1% of the total weight of the alloy tube, and 2.5% of the total weight of the alloy tube, which accounts for the total alloy tube. The weight is 1.5% tin, which accounts for 0.375% of the total weight of the alloy tube, and the balance is zinc. According to the above ratio, the electrolytic copper, bismuth, tin, aluminum, phosphorus and zinc are placed in a power frequency electric furnace, heated to 1200 degrees to 1250 degrees, completely melted and then kept to 1150 degrees; then the graphite rod is used to fully melt the completely molten alloy liquid. After stirring, it is covered with high-purity flaky graphite powder to prevent oxidation thereof, and the high-purity flaky graphite powder has a thickness of about 12-15 cm and is kept warm; after 1-1.5 hours of incubation, it is imported from Germany. The Parker direct reading spectrometer performs three component tests on the samples taken from the furnace to determine that the alloy composition is within the specified range. After the test, the alloy liquid is reheated to 1200 degrees, and the vibration device of the power frequency electric furnace is turned on. The continuous casting method is cast into a solid blank alloy pipe with an outer diameter of 200 mm, an inner diameter of 100 mm and a length of 500 mm. The surface of the blank alloy pipe is machined by a copper ingot milling machine, and the surface is smooth and clean with a diameter of 195 mm, an inner diameter of 105 mm, and a length of 500 mm. Alloy tube; annealed, the surface treated copper rod is annealed in a box annealing furnace, and the annealing temperature is 100-150 degrees, retreating The time is 1-1.5 hours; after that, it is extruded by a 2000-ton double-action extruder, and the heating temperature of the alloy ingot is 200-250 degrees, the extrusion temperature is 300 degrees, and the extrusion speed is V=4.5 mm/s. The finished copper rod has a diameter of 155mm and an inner diameter of 120mm. Finally, the alloy pipe to be extruded and cut is cut with a high-precision cutting machine, cut into a length of 500mm and deburred, and the surface is machined with a high-precision lathe. It is turned into a finished product with a diameter of 150 mm and an inner diameter of 125 mm and packaged into the warehouse. Compared with the existing lead-containing alloy tubes, the cutting performance is good, the workability is good, the wear resistance is good, the preparation process is simple, the cost is low, and the environment is not polluted. The invention provides a novel lead-free copper-based alloy tube and an existing lead-containing alloy tube machine

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; the invention is modified or equivalently substituted without departing from the spirit and scope of the invention. Within the scope of protection.

Claims

Claim

A novel lead-free copper-based alloy tube characterized by comprising: 50-54% of the total weight of the alloy tube, 0.5% to 1.5% of the total weight of the alloy tube, accounting for the total alloy tube The weight is 2-3% aluminum, 1-2% of the total weight of the alloy tube, and the phosphorus is 0.05-0.8% of the total weight of the alloy tube, and the balance is zinc.

2. The novel lead-free copper-based alloy tube according to claim 1, characterized in that it is composed of the following components: copper, which accounts for 50% of the total weight of the alloy tube, accounts for 0.5% of the total weight of the alloy tube, and accounts for a total of the alloy tube. The weight is 2% aluminum, which accounts for 1% of the total weight of the alloy tube, and accounts for 0.05% of the total weight of the alloy tube. The balance is zinc.

3. The novel lead-free copper-based alloy tube according to claim 1, which is composed of the following components: copper which accounts for 54% of the total weight of the alloy tube, and which accounts for 1.5% of the total weight of the alloy tube, occupies the alloy tube. A total weight of 3% of aluminum, 2% of the total weight of the alloy tube of tin, 0.8% of the total weight of the alloy tube of phosphorus, the balance is zinc.

4. The novel lead-free copper-based alloy tube according to claim 1, characterized in that it is composed of the following components: copper, which accounts for 52% of the total weight of the alloy tube, accounts for 1% of the total weight of the alloy tube, and occupies the alloy tube. The total weight of 2.5% aluminum, which accounts for 1.5% of the total weight of the alloy tube, accounts for 0.375% of the total weight of the alloy tube, and the balance is zinc.

The novel lead-free copper-based alloy tube according to any one of claims 1 to 4, wherein the copper is electrolytic copper.

A method of preparing a novel lead-free copper-based alloy tube according to any one of claims 1 to 5, which comprises the following steps:

1) Place copper, tantalum, tin, aluminum, phosphorus and zinc in a power frequency electric furnace according to the ratio, heat to 1200-1250 °C, and keep warm to 1150 °C after being completely melted;

3) After 1 to 1.5 hours of incubation, the sample taken from the furnace is subjected to component inspection using a spectrometer. Determine that the alloy composition is within the specified range;

7) Extrusion, extrusion with 2000 tons of double action extruder, and the heating temperature of the alloy ingot is 200-250 °C, the extrusion temperature is 300 °C, the extrusion speed is 4.5mm/s, the alloy after extrusion The tube has a diameter of 155 mm and an inner diameter of 120 mm;

8) Cutting and turning, the extruded alloy pipe is cut by high-precision cutting machine, cut into alloy pipe with length of 500mm and deburred, and the surface is turned by lathe to make the diameter of 150mm and the inner diameter is 125mm _;

9) Packing into the warehouse.

The method for preparing a novel lead-free copper-based alloy rod according to claim 6, characterized in that: the number of times of component inspection in the step 3) is three.

8. The method for preparing a novel lead-free copper-based alloy rod according to claim 6, wherein: the spectrometer in the step 3) is a Spike direct reading spectrometer.