Bainitic Nodular Cast Iron Roll

Introduction

Bainitic nodular cast iron roll is a kind of , which is known as  and is a roll made by spheroidizing the molten iron with magnesium and pouring it into the sand-lined cold type. Due to the spheroidizing treatment, the graphite carbon inside the cast iron is changed from flake to spheroid, which eliminates the phenomenon of graphite tip stress concentration caused by flake graphite, which significantly improves the strength of cast iron, similar to the cast steel roll, but the abrasion resistance is much higher than the cast steel roll. There are three types of nodules of magnesium, cerium, and calcium and magnesium are commonly used. Spheroidal graphite iron roll can be applied in open-rolling mills, roughing mills ands before finishing rolling on various sections and plates. When the finished roll bears a large load, it is best to use a ductile iron roll with a , high strength and excellent wear resistance.

Bainitic nodular cast iron roll is made of Ni, Mn, CrH, Mo, etc. It has an acicular structure and would be higher strength and better toughness than pearlite iron. Due to the high alloy content and high casting stress, the acicular bainite ductile iron roll can obtain the ideal comprehensive performance by a centrifugal composite casting process. the feature of Bainitic nodular cast roll is that it shaped into graphite ball and its performance can be compared with that of alloy indefinite chilled roll. Its intensity is higher than that of indefinite chilled one, so it is usually used for rest energy casting. the bainitic nodular roll manufactured by TINVO has the standards including ISO, GB, ASTM, DIN, JIS, high quality with the best price guaranteed.

Based on the analysis of the macro and microstructures of conventional Ni-Mo bainite ductile cast iron rolls used in bar finishing mills, we have found that the main cause of the spalling failure of the roll surface layer is the low bainite mass fraction in the roll structure, Irrational distribution of carbide morphology, and non-round graphite morphology.