Making steel from iron is the secondary refining process also known as secondary metallurgy. Steel producers increasingly manufacture high-carbon, low-carbon, structural, special alloyed and mechanical steel qualities, with high resistance, strength and purity requirements. Inferior quality of raw materials increases process difficulties due to the presence of harmful residual elements such as sulfur, phosphorous, hydrogen, non-metallic inclusion of SiO2 and Al2O3, amongst others.
These impurities can be treated and even removed using Affival’s product range for secondary metallurgy, cored wires and slag conditioners.
The application of these products comprises precise technical diagnosis, using state-of-the-art computer modelling and empiric data from in-situational use as well as follow-up by our highly qualified technicians to ensure optimum results and customer satisfaction.
Wire injection using Affival cored wire is the low cost, effective process for in-ladle treatment. The cored wire is made of a low carbon steel sheath in which the powdered minerals, metals and ferroalloys are tightly encased. With the PapCal® technology, for example, the calcium in the wire is protected in a “sandwich casing” which delays heat transfer from the liquid steel. The casing is made of an inner steel strip covered by a paper insulation and an outside steel casing. The insulation allows a deeper penetration of calcium into liquid steel which gives longer reaction time and higher and consistent recovery.