Industry instrumentation : Units and conversion tables for process control - Instrumentación industrial : Unidades y tablas de conversión para el control de procesos


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Stainless steel is a group of iron-based alloys that contain at least 10.5% chromium. The exact composition of stainless steel can vary depending on the specific grade, which is determined by the types and amounts of other alloying elements added to the steel. Here are some of the common elements found in stainless steel:

  1. Chromium (Cr): Chromium is the most important alloying element in stainless steel. It forms a passive, self-healing oxide layer on the surface of the steel, which helps to protect it from corrosion.

  2. Nickel (Ni): Nickel is often added to stainless steel to improve its corrosion resistance and toughness. It also enhances the steel's ductility and makes it easier to form and weld.

  3. Molybdenum (Mo): Molybdenum is often added to stainless steel to improve its resistance to pitting and crevice corrosion, especially in chloride-containing environments.

  4. Carbon (C): Carbon is often added to stainless steel to improve its hardness and strength. However, too much carbon can reduce the steel's corrosion resistance, so the amount of carbon added is carefully controlled.

  5. Silicon (Si): Silicon is added to stainless steel to improve its oxidation resistance at high temperatures.

  6. Nitrogen (N): Nitrogen is sometimes added to stainless steel to improve its corrosion resistance, especially in high-temperature applications.

Other elements that may be present in smaller amounts in stainless steel include copper, titanium, and manganese.

Stainless steel can be divided into several main categories based on their microstructure, such as austenitic, ferritic, martensitic, duplex, and precipitation hardening stainless steels. Each category has different properties and is suited for different applications.

* American Iron & Steel Institute.

The American Iron and Steel Institute (AISI) is a non-profit organization that represents the North American steel industry. It was founded in 1916 and is headquartered in Washington, D.C.

The mission of the AISI is to advance the interests of the steel industry and promote the use of steel in a variety of applications. The organization represents steel producers and manufacturers of steel products, as well as suppliers of raw materials and equipment used in the steelmaking process.

The AISI provides a wide range of services to its members, including technical assistance, market research, and advocacy on public policy issues affecting the industry. The organization also works to promote the use of steel in various applications, such as construction, transportation, and energy.

In addition to its work on behalf of the steel industry, the AISI is also involved in the development of industry standards and specifications. For example, the organization has developed a number of standards for the design and construction of steel structures, as well as standards for the testing and performance of steel products.

Overall, the AISI plays an important role in promoting and supporting the North American steel industry. Its efforts help to ensure that steel remains a vital and competitive material in a wide range of industries and applications.

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