SG-AC Cr Acicular Chill Rolls
SG-AC Cr Acicular Chill rolls are derived from SG-AC Acicular Chill material. This material is stronger and more wear resistant than SG-PC Pearlitic Chill and capable of a much higher hardness. The noticeable difference compared to conventional SG-AC Acicular Chill is the increased alloys, most notably Chromium which maintains hardness penetration to a further depth.
As with SG-AC Acicular Chill, it is formed of nodular graphite and carbides in an acicular (needle-like) bainitic matrix, also called Lower Bainite. The additional alloys achieve a deeper hardness penetration of carbides and consequently, SG-AC Cr Acicular Chill has a lower hardness drop than its counterpart. This leads to better wear resistance, especially for rolls with deeper grooves. The improved wear resistance is associated with a slight reduction in the mechanical properties of the core and neck material. SG-AC Cr Acicular Chill is more wear resistant than its pearlitic counterpart of equal hardness, however, SG-PC Cr Pearlitic Chill has a higher overall resistance to fire-cracking.
The extended indefinite chill characteristics give SG-AC Cr Acicular Chill rolls very good hardness penetration so that they are suitable for all types of sections, tubes and dogbone & slitting stands in Bar mills. Owing to the above, higher hardness SG-AC Cr Acicular Chill grades are Hisar’s most wear resistant SG Iron grades.
All rolls of this material are statically single poured.