By clicking on a letter you get the suitable technical terms in the list.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Alloys
An alloy is a steel material than contains other metallic and/or non-metallic elements (e.g. carbon, chromium, silicon) besides iron. By balancing the ratio of their composition, certain material characteristics can be achieved.
AOD converter
AOD stands for argon-oxygen decarburization. This is a special converter, in which the carbon content of the stainless steel heats is reduced to the targeted specifications by injection blowing of argon and oxygen mixtures.
Austenitic stainless steel
Austenitic stainless steel is a steel alloyed with chromium and nickel that is not magnetic. It is the most commonly used type of stainless steel.
Chromium
Chromium is a metal which makes the steel corrosion resistant. As an alloying element in the steel it has a content in excess of 12%.
Cold rolling
The deformation of steel that takes place after hot rolling or strip casting. The material is reduced to a specified thickness by applying pressure between two rolls in the cold rolling stand’s roll gap. The difference to hot rolling is the temperature at which the rolling process takes place: Cold rolling is always performed at a temperature lower than the recrystallization temperature, which always requires subsequent annealing. Cold rolling of stainless steel is generally carried out on a reversing multi-roll stand with small work rolls that allow for high thickness reduction. This also applies to grades with a low deformability.
Cold strip
Cold strip is a cold reduced flat product that is annealed and pickled or bright annealed after the rolling process. It is available in many different surface finishes including ground, polished, patterned etc. The advantage of cold rolled strip – in comparison to hot rolled strip – is its higher dimensional accuracy.
Continuous casting
A semi-continuous process for the production of slabs from liquid steel, by casting the liquid steel into a water-cooled copper mold. The cast strand emerges from the mold with a solidified surface layer and is guided by rolls while being cooled. A cutting torch reduces it to the required slab length.
Ferritic stainless steel
Ferritic stainless steel contains > 12% of chromium. It is free of nickel and magnetic.
Hot rolling
A deformation procedure. The rolling at high temperatures allows large thickness reductions. 2.5 millimeter thin strips with a length of up to 1 kilometer are rolled from a slab with a thickness of 250 millimeters and a length of 10 meters. In extreme cases, a thickness of up to 1.5 millimeters is achievable.
Hot wide strip
A hot-rolled steel strip in widths of >600 mm that is rolled from a slab in a semi continuous or continuous hot strip mill. Instead of being processed in a hot strip mill stainless steels are frequently also rolled in Steckel mills. Hot-wide strip is suited for specific applications but is mainly used as feedstock for the cold-rolling process.
Molybdenum
Molybdenum is added to some stainless steel in quantities of up to 5% in order to improve their corrosion resistance especially regarding chlorine. It also increases the high-temperature strength of stainless steels.
Nickel
As an alloying element, nickel’s main responsibility is to increase the corrosion resistance and the ductility of stainless steels.
Nickel alloy
Nickel alloy is a collective term for a group of alloys that have a high content of nickel and other metals e.g. copper, chromium, iron, molybdenum. Nickel alloys are characterized by a particularly high heat and/or corrosion resistance. They are not classified as steel. Nickel alloys belong to the high performance alloys and are produced at ThyssenKrupp VDM, which belongs to the Stainless group.
Passive layer
Due to the high chromium content in stainless steel a dense and protective layer forms on the surface of the material. It serves as a protective barrier between the material and the environmental media and is impermeable and insoluble. In case of damage the layer independently rebuilds itself under the influence of oxygen.
Precision strip
A cold-rolled strip with a thickness of ideally between 0.01 and 0.4 millimeters and a maximum width of 650 millimeters. It meets special demand tolerances in terms of strength, dimensional accuracy, edge and surface quality.
Recycling
Reintroduction of a material or component into the production cycle in order to produce a new end product. Recycling turns scrap into a steel production raw material. Because of its 100-percent recyclability without loss of quality, stainless steel is a particularly environmentally friendly material. Its recyclability is therefore an important material property.
Sendzimir mill
A Sendzimir mill at ThyssenKrupp Stainless is a monoblock multi-roll stand (20 rolls) designed to cold roll stainless steel sheets. It is named after its inventor Tadeusz Sendzimir. Cased in, the two thin work rolls are supported by numerous back-up rolls. It is particularly suited for rolling stainless steels.
Slab
Compact rectangular block of crude steel cast in the continuous caster. The slab is the hot rolling mill’s feedstock for the production of hot strip or heavy plate.
Stainless Steel
In comparison to conventional, unalloyed steels stainless steels e.g. are considerably more corrosion resistant. Stainless steels are rust, acid and heat resistant. This is the result of a protective passive chrome oxide layer. Furthermore they are hygienic, long-lasting, environment-friendly, can be reformed and are known for their low-maintenance. Stainless steel is an indispensable material for all kinds of applications that are subject to different types of corrosion and require hygienically flawless surfaces. Moreover stainless steel has excellent mechanical and physical characteristics. It is predominantly used in the following areas: Architecture, household, food/beverage industry, automotive industry, traffic engineering and in the chemicals and power generation industry. At ThyssenKrupp Stainless, stainless steel is produced in the plants of ThyssenKrupp Acciai Speciali Terni, ThyssenKrupp Nirosta, ThyssenKrupp Mexinox and Shanghai Krupp Stainless.
Strip casting
The technology used at ThyssenKrupp entails a procedure where liquid steel is cast between two rotating rolls. The steel subsequently solidifies to a thin hot strip. Because conventional hot rolling is not necessary an entire processing step is eliminated.
Titanium
Titanium is used industrially as a pure metal. It possesses a tensile strength similar to stainless steel, but displays superior corrosion resistance properties in certain aggressive media. Moreover it has a low specific density. Titanium is used mainly in the chemical or in closely related industries. It is also widely used to form alloys. Titanium-based alloys normally contain elements like aluminum, vanadium, tin, molybdenum, iron, silicon and sometimes special metals like palladium, ruthenium, tungsten, niobium and so on. Titanium alloys can display a strength similar to structural steels. They are normally used in the aerospace industry. At ThyssenKrupp Stainless titanium is produced in the plants of ThyssenKrupp Titanium.