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Nickel is a hard, malleable, ferromagnetic metal that is highly polished and resistant to corrosion. Nickel is an iron loving element. The earth's core is mainly composed of iron and nickel. In the crust, the nickel content of iron magnesian rocks is higher than that of aluminosilicate rocks. For example, the nickel content of peridotite is 1000 times that of granite, and the nickel content of gabbro is 80 times that of granite.
On October 27, 2017, the list of carcinogens published by the international agency for research on cancer of the World Health Organization was preliminarily sorted and referenced. In the list of class I carcinogens, metal cobalt, metal nickel and implanted foreign bodies in vivo containing alloy powder containing 66-67% nickel, 13-16% chromium and 7% iron, nickel metal and nickel alloy were in the list of class 2B carcinogens.
