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Nickle free cupronickel alloy and manufacturing method thereof for coinage

A nickel-nickel-white copper and coinage technology, applied in coins, applications, clothing, etc., can solve the problems of rising copper-based metal circulation coins manufacturing costs, affecting circulation and use, etc., to reduce the cost of metal raw materials, improve cutting performance, and reduce manufacturing costs. Effect

Active Publication Date: 2013-05-08
金川集团精密铜材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When copper is used as a metal circulation coin, in order to make it have a silver-white metallic luster, it is often necessary to add about 15% nickel to the copper base alloy. In addition, the copper price has continued to rise in recent years, which makes the possible manufacturing cost of copper-based metal circulation coins significantly Climbing, affecting circulation and use

Method used

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  • Nickle free cupronickel alloy and manufacturing method thereof for coinage

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Effect test

Embodiment 1

[0036] Put 50% Cu in a power frequency furnace for smelting. After the copper starts to soften, cover the surface of the copper with charcoal. The amount of charcoal is 15-25kg per ton of copper. The melting temperature is 1180-1210°C. Add 0.5% by mass of Al (considering burning loss) and 21.7% of Cu to the molten copper liquid, and use the large amount of heat generated by the dissolution of aluminum to melt the cold copper to reduce energy consumption and metal burning loss. After the added Al and Cu are melted, add 18.0% by mass of Zn to the copper liquid (consider burning loss); for the purpose of adding aluminum first and then adding zinc, low-priced metal aluminum can be used to deoxidize the copper liquid, and The aluminum is used to form a dense aluminum oxide protective film on the surface of the copper liquid to reduce the volatilization loss of the copper liquid and the subsequent added zinc. After the metal Zn is melted, Cu-Mn and Cu-Ti master alloys are added to ...

Embodiment 2

[0044] Put 60% by mass of Cu into a power frequency furnace for smelting. After the copper starts to soften, a layer of charcoal is covered on the copper surface. The amount of charcoal is 15-25kg per ton of copper. The melting temperature is 1180-1210°C. Add 0.6% by mass of Al (considering burning loss) and 14.5% of Cu to the molten copper liquid, and use the large amount of heat generated by the dissolution of aluminum to melt the cold copper to reduce energy consumption and metal burning loss. After the added Al and Cu are melted, add 19.0% by mass of Zn to the copper liquid (consider burning loss); for the purpose of adding aluminum first and then adding zinc, low-priced metal aluminum can be used to deoxidize the copper liquid, and The aluminum is used to form a dense aluminum oxide protective film on the surface of the copper liquid to reduce the volatilization loss of the copper liquid and the subsequent added zinc. After the metal Zn is melted, Cu-Mn and Cu-Ti master ...

Embodiment 3

[0052] Put 63% of Cu in a power frequency furnace for smelting. After the copper starts to soften, a layer of charcoal is covered on the surface of the copper. The amount of charcoal is 25kg per ton of copper. The melting temperature is 1180-1210°C. Add 0.75% by mass of Al (considering burning loss) and 14.8% of Cu to the molten copper liquid, and use the large amount of heat generated by the dissolution of aluminum to melt the cold copper to reduce energy consumption and metal burning loss. After the added Al and Cu are melted, add 20.0% by mass of Zn to the copper liquid (consider burning loss); for the purpose of adding aluminum first and then adding zinc, low-priced metal aluminum can be used to deoxidize the copper liquid, and The aluminum is used to form a dense aluminum oxide protective film on the surface of the copper liquid to reduce the volatilization loss of the copper liquid and the subsequent added zinc. After the metal Zn is melted, Cu-Mn and Cu-Ti master alloy...

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Abstract

The invention discloses a nickle free cupronickel alloy and a manufacturing method thereof for coinage. The cupronickel comprises elements of, by mass, 16.0 to 19.0 percents of Zn, 3.0 to 4.0 percents of Mn, 2.3 to 3.5 percents of Ti, 0.3 to 0.6 percent of Fe, 0.3 to 0.6 percent of Al, 0.2 to 0.4 percent of Sb, 0.05 to 0.2 percent of Ce, no more than 0.9 percent of impurities, and the balance copper. According to the nickle free cupronickel alloy and the manufacturing method thereof, a multi-component alloy and a composite adding mode are utilized, the comprehensive performance of the alloy is improved, the cutting performance of the alloy is improved by adding Sb, and Ti, Mn, Fe, Zn and Al are added to replace Ni and Cu in the alloy matrix, so that the manufacturing cost of the alloy is reduced, and the metal material cost can be reduced by 23,000 to 30,000 yuan per ton.

Description

Technical field [0001] The invention relates to copper and copper alloy processing, belonging to the technical field of metal material alloying, material anti-corrosion and alloy smelting, in particular to a nickel-free copper-nickel alloy for coinage and a preparation method thereof. Background technique [0002] Metal coins have the advantages of high cleanliness, fewer germs, and are beneficial to the health of the people; coins are wear-resistant, have a long circulation cycle, and are less costly, and save resources. As an ancient metal, copper has a history of being used as a metal currency in many countries around the world. Because copper ions can kill germs, copper-based metal circulation coins have antibacterial effects, which are beneficial to the physical and mental health of users. Cupronickel has silver-white metallic luster, high strength, good processability and corrosion resistance, high dimensional accuracy of processed products, and smooth surface. It is an ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/04C22C1/03A44C21/00
Inventor 贺永东杨志强
Owner 金川集团精密铜材有限公司