Adamite rolls have a carbon content of 1.5% to 2.3% with various alloy elements such as Cr, Ni, Mo, and V. Generally, the mass fraction of free carbides is about 6% to 10%, with small hardness drop and high wear resistance. The rolls have high performance, good toughness, significantly reduced consumption, improved surface quality of profiles and rail beams, etc. They are widely used to replace cast steel rolls and low-alloy cast iron rolls, such as large-sized steel rough rolls, profile steel rolling mills, intermediate rolling mills, work rolls in the hot rolling strip continuous mill, etc. The carbon content and alloy element content of the semi-steel rolls are adjusted according to the applications of the rolls and the corresponding heat treatment process is used to control the roll structure with different matrix, carbide content and morphology to meet the requirements of different rolling mills.
Adamite Roll
Adamite rolls have the good abrasion resistance and the chemical composition contains various alloying elements. The carbon content of the alloy adamite roll is usually between 1.2-2.3%, the rest alloy elements contain Cr, Ni, Mo V, etc. It has the feature of small hardness drop, good wear resistance, good toughness, significantly reduced consumption and the surface are made of the quality of section steel and beams is improved obviously. In addition, 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. The 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. TINVO adamite rolls have standards including ISO, GB, ASTM, DIN，JIS.
Most of the semi-steel rolls are produced by the static integral casting method. 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.
Adamite rolls 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%.
Application
Work roll, back up roll and vertical roll for section steel mill, wire rod and bar rough rolling, medium rolling mill, large and medium section steel rolling mill, rail beams, steel billet mill, universal section steel mill; hot rolling steel and strip rough rolling mill.
Graphitic Steel Roll
Graphitic steel roll is in semi-finished condition. The carbon content and matrix are similar to adamite roll. It also has some features and usage similar to semi-steel roll. The microstructure consists of pearlite, carbide and precipitated graphite, which acts to improve wear-resistance and hardness. The roll is ideal for mills having problems with firecracking. It can be widely used as a work roll of medium plate reversible rolling mill, blooming mill, steel billet rolling mill and high-speed wire rod roughing mill bar. The TINVO graphitic steel roll has quality standards including ISO, GB, ASTM, DIN.
The graphitic steel roll refers to add an appropriate amount of inoculant alloy and nodulizing agent in the molten steel through controlling the content of graphitizing elements and carbide forming elements and the corresponding proportion, to inoculate and nodulate During the solidification process, the rolls form spherical or agglomerated graphite.
The carbon content of graphite steel rolls is equivalent to that of smil-steel roller. The microstructure of the matrix is similar to that of a smil-steel roller. There are still wear-resistant particles with granular and rod-shaped carbides in the matrix structure, and there is a certain amount of spherical graphite in the matrix structure.
According to the purpose of the roll, the carbon content, alloy element content, and hardness requirements of the graphite steel roll can be adjusted, and the content and morphology of carbide and graphite in the structure can be controlled.
Application
work roll of two-high strip mills machine, medium plate reversible rolling mill, rough rolling mill, blooming mill, steel billet rolling mill, high-speed wire rod roughing mill.
For more detailed information, please visit the page of TINVO mill rolls
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