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https://www.aulistermetal.com/products/uns-n02201-ni-201-nickel-plate.html UNS N02201, also known as Nickel 201, is a highly pure form of nickel that offers a slightly lower carbon content than its counterpart, Nickel 200 (UNS N02200), making it more resistant to graphitization and therefore preferable for applications involving exposure to temperatures above 600°F (315°C). This characteristic ensures excellent thermal and electrical conductivity, alongside superior resistance to a wide range of corrosive environments, including acids and alkalis.