The main uses of nickel iron and metallic nickel are:

    In 1804, after the extraction of metallic nickel from ore, nickel did not show significant development for about 100 years due to limitations in technological conditions and resource scarcity at that time. Until the eve of World War I, the world's nickel production was only a few thousand tons After the first, especially after World War II, nickel production increased sharply.

    In 1865, Ganier reduced and smelted silicon magnesium nickel ore with gypsum and coal to obtain nickel mirrors, thereby enriching a small amount of nickel in the original ore. After burning off sulfur, the obtained nickel oxide is reduced to nickel in the solid state using carbon reduction process.

    Nickel can be completely dissolved in r-iron, with a solubility of 10% in a-iron. A nickel content of 5% can improve the tensile strength and hardness of low-carbon structural steel. Containing 3% nickel in carbon steel can improve its tensile strength, impact toughness, yield point, and deformation ability. NiCrMo structural steel containing 1% to 4% nickel is suitable for use in the automotive, locomotive, and machinery manufacturing industries due to its appropriate ratio of tensile strength to mass. In addition to these elements, wear-resistant components also contain carbon. The important nickel containing steel grades and users are stainless steel and heat-resistant special steel. For example, a series of heat-resistant stainless steels such as Cr18Ni9Ti and Cr17Ni1iMn2 have good thermal processing performance and are widely used in machinery, medical, national defense, and light industry.

    Nickel has a slight graphitization effect in cast iron. Can stabilize pearlite and reduce ferrite content. Therefore, nickel in cast iron helps to achieve a uniform and integrated structure and good performance. Adding a small amount of nickel (Ni0.%~1.0%) can lead to the formation of fine pearlite, and when the nickel content is high, martensite and austenite will be formed. Fine and stable pearlite can give cast iron good workability and hardness. Therefore, nickel added cast iron parts can be used to manufacture castings in the automotive manufacturing industry.

    A low iron nickel alloy containing chromium, diamond, and aluminum, commonly referred to as Hastelloy corrosion-resistant nickel based alloy when used as a high-temperature alloy, has a tensile strength of up to 233 at 923 ℃ 24MPa. Iron nickel alloys containing 30% to 90% Ni have high magnetic permeability, making them suitable for the electrical and electronic industries, such as the Claymax alloy containing 30% Ni and 70% Fe. An alloy containing Ni80%, Cr14%, and Fe6% is a special corrosion-resistant spring material used in dental treatment. Nickel is also used as coins and in the battery industry.