Indefinite chill cast iron is a material between chill cast iron and grey cast iron. The work layer of this material consists of flake graphites, while the deph below barrel surface increases, the amount of graphites will increase too, but the hardness will decrease. According to different rolling conditions, the matrix of the rolls could be controlled as pearlite , bainite, martensite or tempered sorbite through adjustingthe chemcial composition. The rolls of this material possess excellent wear resistance, thermal cracking resistance, spall resistance and biting properties.
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