Corrosion resistant steel is a steel containing at least 10.5% of chromium and up to 1.2% of carbon. According to their application, they are divided into stainless, heat-resistant and heat-resistant steels. Depending on the crystal structure, we distinguish between austenitic, ferritic, martensitic, duplex (ferritic-austenitic) steels and secretion-hardened steels.
The basic features of ferritic steel includes good corrosion resistance, resistance to high temperature oxidation, good ductility and moderate formability. Due to their mechanical properties (higher yield ductility and lower tensile strength), they are always supplied in an annealed condition. Due to their good resistance to oxidation, they work well at high temperatures. Steel with a ferritic structure is most often used for production of household appliances, cutlery, bowls and dryers, decorative car elements, hot water tanks, steam superheater tubes and boilers for sugar refineries, chimney channels and in the transport industry.
Martensitic steel is characterized primarily by high mechanical strength, hardness and abrasion resistance. They have low resistance to stress corrosion, low impact and ductility, low weldability and low weldability. Due to their properties, they are mainly used for the production of knife blades, surgical instruments, components for the chemical industry, as well as for the production of marine equipment, elements for aviation and the defense industry.
AAustenitic stainless steel is the most popular group of all stainless steel. Austenitic stainless steel is characterized by the principle of very high corrosion resistance, high ductility, high susceptibility to shaping, very good weldability, susceptibility to stress corrosion, low thermal conductivity and thermal expansion, strengthening to high strength by cold plastic working and lack of strengthening due to heat treatment. Due to the following properties, constantly used in the production of equipment and furniture for gastronomy, home appliances, hospital and transport equipment. They are also general information in the chemical, petrochemical, paper, building and architecture industries. They are used for the construction of plumbing installations, sewage treatment plants or for storage in cryogenic conditions, such as liquefied natural gas.
They are generally called duplex steels. They are characterized by the combination of most properties of austenitic and ferritic steels, and, above all, very good corrosion resistance, including stress, high strength properties, good impact, weldability, ductility and abrasion resistance. Ferritic-austenitic steels are used on devices for the paper, chemical and shipbuilding industry. The most commonly used are duplex steels for the construction of chemical tankers, for the production, transport and storage of chemicals, for the construction of flue gas desulfurization installations, components and devices operating in seawater environments, pumps and valves on oil platforms, desalination installations, tanks for the pulp and paper industry in the food industry for the construction of tanks for the production of highly-salted foods as well as for the construction of bridges and footbridges.
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Constantly adulterated, they are characterized by very high mechanical properties but at the same time they are the least popular group. They are characterized by moderate corrosion resistance, very high mechanical strength, fatigue and at the same time low resistance to stress corrosion, low ductility and impact resistance, low susceptibility to shaping and low weldability. Due to their properties, and thus also their high price, permanently hardened secretions are most commonly used in the aerospace, defense, chemical and food industries. They find, for example, in the production process of aircraft chassis components, aviation components and teams, high-strength pump shafts and valve spindles, as well as golf clubs