Special Bar Quality steels...

Special Bar Quality steels Special bar quality (SBQ) steels represents a wide variety of higher quality carbon and alloy steels. Although there is no single definition, special bar quality steel can be defined as steel that moves (rotates, twists or bends) rather than stays still whilst in use. The term is used to describe steel long products for more demanding processing or end-use applications which cannot be met by merchant quality grades. The term “Special Bar Quality” is a predominantly a North American term. In Europe, special bar quality steels are commonly known as “engineering steels”. Both these terms refer to steel types as well as to bar products, and as they are often associated with the steel grades, they refer to billet and slab as well as bar. SBQ steels are at the higher end of the quality spectrum in both metallurgical consistency and dimensional accuracy. Some end uses of these steels may require superior surface quality, or special chemical restrictions, metallurgical characteristics, heat treatment or surface finishes. The internal quality of these steels is very important since machining and bending activities are involved during the processing of these steels in subsequent stages. In order to achieve metallurgical quality, the steel has to be particularly clean. This makes the production route of these steels a bit complex. Steel cleanliness can be achieved through the integrated route or through an additional refining step and cleaner iron bearing inputs into an EAF in a mini mill. Internal metallurgical quality and consistency is also achieved by a meaningful reduction during the rolling process. These steels are produced both in cut lengths and coils. The specification of SBQ steels may range from plain carbon and carbon manganese steels to alloy and stainless steels containing different percentages of...