#Chromium source how to

The most common type is the 18/8, or 304, grade, which contains 18 percent chromium and 8 percent nickel. They are not hardenable by heat treatment and are nonmagnetic.

Austenitic steels, which contain 16 to 26 percent chromium and up to 35 percent nickel, usually have the highest corrosion resistance. The majority are classified into five major groups in the family of stainless steels: austenitic, ferritic, martensitic, duplex, and precipitation-hardening. There are more than 100 grades of stainless steel. Thus, cheaper raw materials, such as high-carbon ferrochromium, may be used in the initial melting operation. By varying the ratio of oxygen and argon, it is possible to remove carbon to controlled levels by oxidizing it to carbon monoxide without also oxidizing and losing expensive chromium. In the argon-oxygen decarburization process, a mixture of oxygen and argon gas is injected into the liquid steel. Most stainless steels are first melted in electric-arc or basic oxygen furnaces and subsequently refined in another steelmaking vessel, mainly to lower the carbon content. Other elements, such as nickel, molybdenum, titanium, aluminum, niobium, copper, nitrogen, sulfur, phosphorus, or selenium, may be added to increase corrosion resistance to specific environments, enhance oxidation resistance, and impart special characteristics. In conjunction with low carbon content, chromium imparts remarkable resistance to corrosion and heat. Stainless steel, any one of a family of alloy steels usually containing 10 to 30 percent chromium. They contain 16 to 26 percent chromium and up to 35 percent nickel, and they are not hardenable by heat treatment and are nonmagnetic.

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#Chromium source how to

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