CN113564412B - Easily-processed gold-like copper alloy and preparation method thereof - Google Patents
Easily-processed gold-like copper alloy and preparation method thereof Download PDFInfo
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- 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
- C22C9/01—Alloys based on copper with aluminium as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
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- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
Abstract
The invention provides an easily-processed gold-like copper alloy and a preparation method thereof, wherein the easily-processed gold-like copper alloy comprises, by weight, 5-8 wt% of Al, 0.3-1.0 wt% of Mn, 0.05-0.20 wt% of Si, 0.01-0.05 wt% of Sr, 0.02-0.08 wt% of Ce and the balance of Cu, and is prepared by a preparation method of smelting, ingot casting, hot rolling, cold rolling and recrystallization annealing. According to the invention, Al, Mn, Si, Sr and Ce elements are added into the copper alloy, the alloy machining performance is improved by utilizing an alloy machining heat treatment mode under the condition of ensuring the alloy to have higher gold chromaticity through reasonable component design, and meanwhile, the alloy is oxidized on the metal surface to generate a compact oxidation product film, so that the alloy has better corrosion resistance and discoloration resistance, the types of elements required by gold-like alloy smelting are reduced, and the alloy production cost and the production period are greatly reduced.
Description
Technical Field
The invention relates to the technical field of new materials, in particular to an easily-processed gold-like copper alloy and a preparation method thereof.
Background
Gold is a precious metal deeply loved by people in the world, and is widely applied to decoration, jewelry, artworks, currency and the like due to the noble, gorgeous and lustrous color and stable and durable chemical properties. Because of the high price and limited reserves of gold, the application of gold is also greatly limited. In order to meet the large demand of fields such as decoration, art ware and the like on the golden alloy, the gold-imitating alloy which is cheap and high in quality, easy to process and high in gold chroma and corrosion resistance becomes a new research and development hotspot.
Most of the imitation gold alloys are Cu-Zn series or Cu-Al series alloys, and in the copper-zinc series imitation gold alloys, the content of zinc is usually 10 to 40 percent; the color of the copper alloy is changed from the original purple red of pure copper to golden yellow of brass due to the addition of zinc, but the corrosion resistance and the anti-tarnishing capability of the gold-imitating copper alloy are gradually reduced due to the increase of the content of zinc in the Cu-Zn gold-imitating alloy. So that the Cu-Zn series gold-imitating copper alloy is limited by corrosion in the using and popularizing process. The design and application of the Cu-Al series gold-imitating alloy avoids the addition of Zn element, improves the corrosion resistance and discoloration resistance of the gold-imitating alloy, gradually replaces the Cu-Zn series gold-imitating alloy, and is widely applied to the fields of decoration, jewelry, coinage and the like. The Cu-Al alloy has great application prospect in future market application as a gold-imitating alloy with great potential. At present, the research and development of gold-imitating materials mainly focus on the aspects of electroplating process research and development, surface titanium nitride spraying, gold-imitating alloy component research and the like. The spraying and electroplating process is greatly limited by processing conditions, and the coating is easy to peel off by external force, so that the research and development of high-quality imitation gold alloy becomes the main direction of the current imitation gold material research and development. The imitation gold alloy has similar color and gold phase, good oxidation resistance and corrosion resistance, high plasticity and is suitable for cold and hot forming, gold plating shell material and other manufacturing. At present, the color of the known copper-based alloy is closer to golden yellow, and the gold imitation materials at home and abroad are generally copper-based alloys, including Cu-Al series, Cu-Al-Ni series, Cu-Zn series and the like. For example, the Chinese patents CN201210364872.7, CN88100404A, CN201710688041.8 and CN201210369055.0 contain rare metals such as gold, silver, indium and the like, and have high price, rare resources and quite difficult industrial application; the CN87104511.7 patent and the CN201710688041.8 patent contain a plurality of elements such as titanium or iron with high melting point, which easily cause the elements to precipitate as a second phase, thereby causing electrochemical corrosion. The problems of complex alloy components, low gold degree, high processing difficulty, high production cost and the like mainly exist in the prior gold-imitating alloy technology, so that the gold-imitating copper alloy which has the advantages of reasonable components, low cost, simple production and environmental friendliness, high gold degree, corrosion resistance, tarnish resistance and easiness in processing and the processing method thereof are needed to be provided.
According to the invention, Cu, Al, Mn, Si and the like are added into the copper alloy, the mechanical processing performance of the alloy is improved by using an alloy processing heat treatment mode under the condition of ensuring that the alloy has higher gold chromaticity through component design, and meanwhile, the alloy is oxidized on the metal surface to generate a compact oxidation product film, so that the alloy has better corrosion resistance and discoloration resistance, the types of elements required by gold-like alloy smelting are reduced, and the alloy production cost and the production period are greatly reduced.
Disclosure of Invention
The invention provides an easily-processed gold-imitating copper alloy and a preparation method thereof, and aims to solve the problems that the traditional gold-imitating copper alloy is expensive in raw material price, long in production period, high in production difficulty, not beneficial to large-scale industrial production and the like.
In order to achieve the above object, the present invention provides an easily processable gold-imitating copper alloy, characterized in that the easily processable gold-imitating copper alloy is composed of Cu, Al, Mn, Si, Ce and Sr; according to the weight percentage, Al5-8 wt%, Mn0.3-1.0 wt%, SiO.05-0.20 wt%, SrO.01-0.05 wt%, CeO.02-0.08 wt%, and the balance of Cu.
Furthermore, the mass ratio of Sr to Ce to Si is 1: 1.5-1.7: 4-5.
The invention also provides a preparation method of the easily processed gold-like copper alloy, which comprises the following steps:
taking various element components according to weight percentage, firstly heating electrolytic copper and pure aluminum to melt, then adding Mn and Si, fully stirring, slagging off, controlling the temperature to be 1300-;
step two, after the copper alloy ingot obtained in the step one is heated and insulated at 750 ℃ for 4 hours, continuously carrying out hot rolling for 7-9 times at 850 ℃, controlling the total hot rolling deformation to be 50-90%, and cooling in air at room temperature to obtain a hot rolling blank;
step three, performing multi-pass cold rolling on the hot rolled blank obtained in the step two, wherein the deformation of the first pass cold rolling is 20-26%, and the total rolling deformation is 40-50%, so as to obtain a cold rolled blank; and recrystallizing and annealing the obtained cold rolled blank in a hydrogen atmosphere at 750 ℃ for 1 hour, and performing water quenching to obtain the easily-processed gold-like copper alloy.
Further, Mn, Si, Ce and Sr added in the step one are added in the form of intermediate alloys of Cu-Mn, Cu-Si, Cu-Ce and Cu-Al-Sr respectively.
Further, in the first step, a medium-frequency induction smelting furnace is adopted to heat and melt electrolytic copper and pure aluminum, cryolite, calcium fluoride and pyro-borax are adopted as covering agents in the melting process, and the volume percentage is 1: 1.
Further, the average casting speed of the semi-continuous casting in the first step is 4.5-6.5 m/h.
Further, in the second step, the deformation of the hot rolling of the first pass is 25-30%, the deformation of the second pass to the fifth pass is 30-50%, and the deformation is gradually reduced after the sixth pass, wherein the deformation is 15-25%.
Further, the hot rolled blank is milled before cold rolling in the third step, and the thickness of the milled surface is 0.3-0.6 mm.
The scheme of the invention has the following beneficial effects:
1. according to the published range of the alloy components of the patent, designed elements can be effectively dissolved in the matrix of the copper alloy in a solid mode, and second-phase particles cannot be separated out, so that the corrosion problem caused by uneven potential of the multi-phase alloy is avoided.
2. The synergistic addition of Al and Mn elements plays a role of a toner, the color of the alloy is changed from the purple red of original pure copper to the gold of brass due to the addition of the aluminum, and the addition of the Al also greatly improves the machining performance and the anti-tarnishing capability of the alloy.
3. The addition of Sr and Ce is beneficial to obviously improving the discoloration resistance of the alloy in artificial sweat, and in order to ensure the uniformity of Sr and combine the requirements of main components of the alloy, the addition of Sr needs to be added in a heat-preserving furnace in the form of a Cu-Al-Sr intermediate alloy; by controlling the addition ratio of Si, Sr and Ce, the corrosion resistance of the alloy can be improved.
4. The main corrosion product of the alloy during corrosion is Cu2O、CuO、Cu(OH)2、Al2O3And MnO2The addition of Si also obviously improves the corrosion resistance of the alloy by a large margin, and SiO2Gradually very stable on the surface of the sample, SiO2Is a dense oxide.
5. The alloy components involved in the invention are all metal elements which are abundant in China, economic in price, non-toxic and harmless, the production process is green and environment-friendly, and the emission meets the national standard.
Drawings
FIG. 1 is a graph showing the polarization of zeta potential of the plate made of the imitation gold copper alloy obtained in example 2 of the invention after corrosion in artificial seawater;
FIG. 2 is a graph showing the polarization of zeta potential of the gold-like copper alloy plate obtained in example 2 after corrosion in artificial sweat.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Aiming at the existing problems, the invention provides an easily-processed gold-like copper alloy and a preparation method thereof, wherein the gold-like copper alloy consists of Cu, Al, Mn, Si, Ce and Sr; according to the weight percentage, the alloy comprises 5-8 wt% of Al, 0.3-1.0 wt% of Mn, 0.05-0.20 wt% of Si, 0.01-0.05 wt% of Sr0.02-0.08 wt% of Ce0.02-0.08 wt% and the balance of Cu.
Example 1
The components are Al: 7.0 wt.%, Mn: 0.9 wt.%, Si: 0.15 wt%, Ce: 0.05 wt%, Sr: 0.03 wt% of gold copper alloy with the balance of copper, and pure aluminum, copper-silicon, copper-manganese, copper-cerium, copper-aluminum-strontium intermediate alloy and electrolytic copper are respectively taken; firstly, drying electrolytic copper, adding aluminum, heating and melting, wherein cryolite, calcium fluoride and burnt borax are adopted as covering agents in the melting process, and the volume percentage is 1: 1; then adding copper-silicon and copper-manganese intermediate alloys to obtain an alloy melt, uniformly stirring the melt, slagging off, controlling the furnace temperature at 1300 ℃, transferring into a heat preservation furnace, adding Cu-Al-Sr and Cu-Ce intermediate alloys into the heat preservation furnace, covering with charcoal, and carrying out semi-continuous casting at 1200 ℃ to obtain a copper alloy ingot, wherein the average casting speed is 6.0 m/h;
heating and preserving the copper alloy cast ingot at 750 ℃ for 2 hours, heating to 850 ℃ to carry out 9-pass hot rolling, wherein the deformation of the first-pass hot rolling is 28%, the deformation of the second-pass to the fifth-pass is increased, the processing of the later-pass is gradually reduced, the total deformation of the hot rolling reaches 90%, and cooling in air to obtain a hot rolling blank;
milling the obtained hot rolled blank to obtain two surfaces with the milling thicknesses of 0.6mm respectively, and performing 4-pass cold rolling, wherein the deformation of the first-pass cold rolling is 20%, and the total deformation is 50%, so as to obtain a cold rolled blank; and (3) preserving the heat of the obtained cold rolling blank for 60min at the temperature of 750 ℃ in hydrogen atmosphere, carrying out recrystallization annealing on the finished product, discharging from the furnace, and carrying out water cooling quenching to obtain the gold-like copper alloy plate.
The alloy plate of example 1 of the present invention and the gold-imitating brass for the Australian coinage were processed into a green compact, gold was subjected to a gold degree test comparison after polishing, and the data is shown in Table 1.
Example 2
The components are Al: 6.5 wt%, Mn: 0.8 wt%, Si: 0.10 wt%, Ce: 0.03 wt%, Sr: 0.02 wt% of gold copper alloy with the balance of copper, and pure aluminum, copper-silicon, copper-manganese, copper-cerium, copper-aluminum-strontium intermediate alloy and electrolytic copper are respectively taken; firstly, drying electrolytic copper, adding aluminum, heating and melting, wherein cryolite, calcium fluoride and burnt borax are adopted as covering agents in the melting process, and the volume percentage is 1: 1; then, adding copper-silicon and copper-manganese intermediate alloys to obtain an alloy melt, uniformly stirring the melt, slagging off, controlling the furnace temperature at 1300 ℃, carrying out a converter, adding the Cu-Al-Sr and Cu-Ce intermediate alloys into a heat preservation furnace, covering with charcoal, and carrying out semi-continuous casting at 1200 ℃, wherein the average casting speed is 6.0 m/h. Heating and preserving the copper alloy cast ingot at 750 ℃ for 2 hours, heating to 850 ℃ to carry out 9-pass hot rolling, wherein the deformation of the first-pass hot rolling is 28 percent, the deformation of the second-pass to the fifth-pass can be increased, the processing of the following-pass is gradually reduced, the total deformation of the hot rolling reaches 90 percent, and air cooling is carried out to obtain a hot rolling blank; milling the surfaces, wherein the milling thicknesses of the two surfaces are 0.6mm respectively, performing 4-pass cold rolling, wherein the deformation of the first-pass cold rolling is 20%, and the total deformation is 50%, so as to obtain a cold rolling blank; and (3) preserving the heat of the obtained cold rolling blank for 60min at the temperature of 750 ℃ in hydrogen atmosphere, carrying out recrystallization annealing on the finished product, discharging from the furnace, and carrying out water cooling quenching to obtain the gold-like copper alloy plate.
The alloy plate and the Australian cast coin in the embodiment 2 of the invention are processed into a blank cake by using imitation gold brass, corrosion experiments are respectively carried out in artificial seawater and artificial sweat after polishing, polarization curves of the alloy plate and the artificial sweat are shown in figure 1 after the alloy plate is corroded for different time, corresponding fitting results are shown in table 3, and it can be seen that the logic values of Tafel areas of the exposed metal surface (0d) of the alloy plate in the embodiment 2 of the invention in two mediums are basically between-4.5 and-6, and the logic value of the Tafel area of the corroded alloy surface in the artificial sweat is obviously lower than that of the Tafel area of the corroded alloy surface in the artificial seawater; the self-corrosion potential of the alloy plate in artificial seawater is concentrated at-0.25V (vs SCE), the self-corrosion potential of the alloy plate in artificial sweat is concentrated at-0.30V (vs SCE), and simultaneously, compared with the polarization curve characteristic parameters of immersion corrosion in two media for the same time, the self-corrosion current density in artificial sweat is obviously lower than that in artificial seawater, and the corrosion polarization resistance in artificial sweat is obviously higher than that in artificial seawater. The fitted data of the polarization curves show that the corrosion ability of the alloy plate of example 2 of the present invention in artificial sweat is stronger than that in artificial seawater. In addition, it can be seen that the difference between the self-corrosion current density and the corrosion polarization resistance of the alloy plate corrosion surface in the artificial seawater is not large in the embodiment 2 of the invention, but the self-corrosion current density of the alloy corrosion surface in the artificial sweat is basically gradually reduced along with the time extension, and the corrosion polarization resistance is basically gradually increased along with the time extension. It is shown that the corrosion product film of the alloy plate material of the embodiment 2 of the invention is continuously increased and densified in artificial sweat, so that the corrosion resistance of the alloy is improved.
Comparative example 1
The components are Al: 7.0 wt%, Mn: 0.9 wt%, Si: 0.15 wt% of imitation gold copper alloy with the balance of copper, and pure aluminum, copper-silicon, copper-manganese, copper-cerium, copper-aluminum-strontium intermediate alloy and electrolytic copper are respectively taken according to the component ratio; firstly, drying electrolytic copper, adding aluminum, heating and melting, wherein cryolite, calcium fluoride and burnt borax are adopted as covering agents in the melting process, and the volume percentage is 1: 1. Then, adding copper-silicon and copper-manganese intermediate alloy to obtain an alloy melt, uniformly stirring the melt, slagging off, controlling the furnace temperature at 1300 ℃, carrying out converter, and carrying out semi-continuous casting at 1200 ℃, wherein the average casting speed is 6.0 m/h. Heating and preserving the heat of the copper alloy cast ingot at 750 ℃ for 2 hours, heating to 850 ℃ to carry out 9-pass hot rolling, wherein the deformation of the first-pass hot rolling is 28 percent, the deformation of the second-pass to the fifth-pass can be increased, the processing of the later-pass is gradually reduced, the total deformation of the hot rolling reaches 90 percent, and air cooling is carried out to obtain a hot rolling blank; milling the surfaces, wherein the milling thicknesses of the two surfaces are 0.6mm respectively, performing 4-pass cold rolling, wherein the deformation of the first-pass cold rolling is 20%, and the total deformation is 50%, so as to obtain a cold rolling blank; and (3) preserving the heat of the obtained cold rolling blank for 60min at the temperature of 750 ℃ in hydrogen atmosphere, carrying out recrystallization annealing on the finished product, discharging from the furnace, and carrying out water cooling quenching to obtain the gold-like copper alloy plate.
The average corrosion rate of the alloy obtained in the comparative example after being soaked in artificial seawater and artificial sweat for 15 days can be seen in table 2, and compared with the alloy obtained in example 1, the corrosion resistance of the alloy is improved by adding Sr and Ce, and particularly the corrosion resistance of the alloy in artificial sweat is greatly improved.
Comparative example 2
The components are Al: 7.0 wt%, Mn: 0.9 wt%, Si: 0.15 wt%, Ce: 0.10 wt%, Sr: 0.10 wt% of gold-like copper alloy with the balance being copper, and taking pure aluminum, copper-silicon, copper-manganese, copper-cerium, copper-aluminum-strontium intermediate alloy and electrolytic copper according to the component proportion; firstly, drying electrolytic copper, adding aluminum, heating and melting, wherein cryolite, calcium fluoride and burnt borax are adopted as covering agents in the melting process, and the volume percentage is 1: 1; then, adding copper-silicon and copper-manganese intermediate alloys to obtain an alloy melt, uniformly stirring the melt, slagging off, controlling the furnace temperature at 1300 ℃, carrying out a converter, adding the Cu-Al-Sr and Cu-Ce intermediate alloys into a heat preservation furnace, covering with charcoal, and carrying out semi-continuous casting at 1200 ℃, wherein the average casting speed is 6.0 m/h. Heating and preserving the copper alloy cast ingot at 750 ℃ for 2 hours, heating to 850 ℃ to carry out 9-pass hot rolling, wherein the deformation of the first-pass hot rolling is 28 percent, the deformation of the second-pass to the fifth-pass can be increased, the processing of the following-pass is gradually reduced, the total deformation of the hot rolling reaches 90 percent, and air cooling is carried out to obtain a hot rolling blank; milling the surfaces, wherein the milling thicknesses of the two surfaces are 0.6mm respectively, performing 4-pass cold rolling, wherein the deformation of the first-pass cold rolling is 20%, and the total deformation is 50%, so as to obtain a cold rolling blank; and (3) preserving the heat of the obtained cold rolling blank for 60min at the temperature of 750 ℃ in hydrogen atmosphere, carrying out recrystallization annealing on the finished product, discharging from the furnace, and carrying out water cooling quenching to obtain the gold-like copper alloy plate.
The average corrosion rate of the alloy obtained in the present comparative example after soaking in artificial seawater and artificial sweat for 15 days can be seen in table 2, and it can be seen that controlling the ratio of Si, Sr and Ce improves the corrosion resistance of the alloy, especially in artificial sweat, compared to example 1.
TABLE 1 color difference test results of gold-imitating alloy for coinage
L- - - - - -lightness axis; a-red green chromaticity axis; b- - -yellow-blue pintles; dL- - - -change in lightness; da-red-green color change; db-change in yellow-blue; dE-integrated chromatic aberration.
Table 2 average corrosion rate of alloy plate system of example 1 of the present invention in artificial seawater and artificial sweat for 15 days
CR- -average corrosion rate.
TABLE 3 polarization curve fitting parameters of gold-imitating alloy for coinage corroded in artificial seawater and artificial sweat for different days
Ecorr- -self-etching potential; i.e. icorr-corrosion current density; rp- -polarization resistance.
The high-discoloration-resistance gold brass alloy prepared by the invention is stored in a salt spray environment for 72 hours according to the GB/T10125-1997, and the color difference change delta E is less than or equal to 26.84; soaking in artificial seawater for 15 days according to GB/T10125-1997 with average corrosion rate CR less than or equal to 0.0659 mm/a; the average corrosion rate CR of 30 days of soaking in the artificial sweat is less than or equal to 0.0456 mm/a; the alloy produced by the invention has the characteristics of high gold chroma, good corrosion resistance and discoloration resistance, convenient processing, economic production raw material price, suitability for industrial production and the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. An easily processed gold-like copper alloy, characterized in that the easily processed gold-like copper alloy is composed of Cu, Al, Mn, Si and Sr; according to the weight percentage, Al5-8 wt%, Mn0.3-1.0 wt%, Si0.05-0.20 wt%, Sr0.01-0.05 wt%, Ce0.02-0.08 wt%, and the balance of Cu.
2. The workable imitation gold copper alloy of claim 1, wherein the mass ratio of Sr to Ce to Si is 1: 1.5-1.7: 4-5.
3. A method of making the workable imitation gold copper alloy of claim 1, comprising the steps of:
taking various element components according to weight percentage, firstly heating electrolytic copper and pure aluminum to melt, then adding Mn and Si, stirring and slagging off, controlling the temperature to be 1300-;
step two, after the copper alloy ingot obtained in the step one is heated and insulated at the temperature of 650-;
step three, performing multi-pass cold rolling on the hot rolled blank obtained in the step two, wherein the deformation of the first pass cold rolling is 20-26%, and the total rolling deformation is 40-50%, so as to obtain a cold rolled blank; and (3) recrystallizing and annealing the obtained cold rolled blank in a hydrogen atmosphere at the temperature of 700-800 ℃ for 0.5-2 hours, and performing water quenching to obtain the easily processed gold-like copper alloy.
4. The method of claim 3, wherein the Mn, Si, Ce and Sr added in step one are added as intermediate alloys of Cu-Mn, Cu-Si, Cu-Ce and Cu-Al-Sr, respectively.
5. The method for preparing the easily processed gold-like copper alloy according to claim 3, wherein in the first step, a medium frequency induction melting furnace is adopted to heat and melt the electrolytic copper and the pure aluminum, and cryolite, calcium fluoride and burnt borax are adopted as covering agents in the melting process, and the volume percentage is 1: 1.
6. The method of claim 3, wherein the average casting speed of the semi-continuous casting in the first step is 4.5-6.5 m/h.
7. The method for preparing the easily processed imitation gold copper alloy according to claim 3, wherein in the second step, the deformation of the hot rolling in the first pass is 25-30%, the deformation of the hot rolling in the second pass to the fifth pass is 30-50%, and the deformation of the hot rolling in the sixth pass is gradually reduced and is 15-25%.
8. The method for preparing the easily processed gold-like copper alloy according to claim 3, wherein the hot rolled blank is further subjected to surface milling before the cold rolling in the third step, and the thickness of the surface milling is 0.3-0.6 mm.
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| CN109971992A (en) * | 2019-03-11 | 2019-07-05 | 中南大学 | High fastness low cost gold bell metal and preparation method |
| CN110029247A (en) * | 2019-03-11 | 2019-07-19 | 中南大学 | A kind of high fastness rich gold metal alloy and preparation method |
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Address after: 110042 No. 138 Dadong East Road, Dadong District, Liaoning, Shenyang Patentee after: SHENYANG MINT Co.,Ltd. Patentee after: China Banknote Printing and Minting Group Co.,Ltd. Address before: 110042 No. 138 Dadong East Road, Dadong District, Liaoning, Shenyang Patentee before: SHENYANG MINT Co.,Ltd. Patentee before: CHINA BANKNOTE PRINTING AND MINTING Corp. |