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Introduction

The semi-steel adamite roll is cast as a whole and there is no weak interface in compound casting roll, thus it has a better capacity, strength and toughness than cast iron roll. This kind of mill rolls can be used as work roll, back-up roll and vertical roll for large-class and medium-class rough rolling mill and intermediate rolling mill of section steel, wire rod, rail beams, steel billet, hot rolling steel strip. 

Most of the semi-steel rolls are produced by the static integral casting method. It must be subjected to high-temperature diffusion annealing. Generally, semi-steel rolls are required to control the total amount of non-metallic inclusions below 0.05%. The centrifugal composite semi-steel back-up rolls are made of semi-steel material, the body and neck of the rolls are made of nodular cast iron, and they have been successfully used in hot-rolled strip steel finishing mill. The semi-steel roll ring is produced by composite centrifugal casting. The outer layer of the roll ring is high-carbon semi-steel. The inner layer of the roll ring is graphite steel or ductile iron. Use a high-speed rotating centrifuge to make two different types of molten steel poured and cast.
 

Chemical Composition

Physical Properties

Metallographic Structure

The metallurgical structure of roll-body work layer: Pearlite + carbide or fine pearlite + a little bainite + carbide