UNS N02201, also known as Ni 201, is a low-carbon variant of Ni 200, designed to reduce the risk of embrittlement from intergranular carbon at high temperatures.
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).