Elemental Analysis of Steel
ELTRA GmbH has over 30 years of experience in the construction of elemental analyzers for the determination of the carbon, sulfur, nitrogen, oxygen and hydrogen content in a variety of ferrous materials such as steel or cast iron. Several analyzers have been specially optimized for in-process analyses and final quality control of such products.
The essential stations of steel production are the blast furnace, converter and finishing. After each step the determination of the C, H, N, S, O content is required for quality control.
In the blast furnace pig iron is produced from iron ore, coke and lime, along with the by-product slag. The burning of coke generates temperatures of up to 1,400 °C inside the blast furnace, which is 30 to 50 meters high. At this temperature, iron ore liquefies and is at the same time chemically reduced through the carbon monoxide coming from the coke.
At the end of this process the pig iron still has a very high carbon content of up to 7 % which is reduced in the converter where scrap metal and, if required, more lime are added. Oxygen is introduced which substantially reduces the existing carbon content by forming gaseous CO2. After this oxidizing process the iron melt can be alloyed with other metals (e. g. chrome, nickel, vanadium, cobalt). Finally, this melt is used to produce the end product.