Cast SteelAT, GAT, GANT, ASN, APN, ADSN, APNK, CAT, CANT

AT rolls are used mainly in case of particularly severe mechanical stresses like in the roughing stands of section mills. GAT, GANT rolls are used in roughing, intermediate and fi nishing stands, especially for structural mills. GAT rolls can be used also in the fi nishing section mill, whilst GANT rolls are employed where high resistance to thermal stresses is required (i.e. blooming mill, roughing mills and fi nishing mills for heavy sections). CAT and CANT, manufactured by centrifugal casting, are used in the rolling of shaped products as rollers and sleeves for universal stands. These grades can be manufactured monobloc or with core in graphitic steel. ASN rolls are used as work rolls for hot strip roughing mills. ADSN rolls are used as work rolls for roughing and the fi rst fi nishing stands of hot strip mills. APN and APNK rolls are used as back-up rolls for hot strip roughing and fi nishing mills, for cold strip mills and for plate mills.

Chemical analysis
TYPECSiMnCrNiMo
AT 0.80÷1.00 0.40÷0.80 0.60÷1.00 0.60÷2.30 up to 0.80 up to 0.40
GAT, CAT 1.00÷2.00 0.40÷1.00 0.60÷1.00 0.60÷2.30 up to 1.20 up to 0.40
GANT, CANT 1.50÷2.50 0.80÷1.60 0.60÷1.00 0.50÷1.50 up to 2.00 up to 0.60
ASN, APN 0.70÷1.00 0.30÷0.80 0.50÷1.00 0.80÷1.70 < 0.80 0.20÷0.60
ADSN 1.00÷1.70 0.30÷0.80 1.00÷1.80 1.20÷1.80 1.00÷1.80 0.20÷0.60
APNK 0.30÷0.70 0.30÷0.80 0.50÷1.00 2.50÷3.50 < 0.80 0.40÷1.00
Mechanical properties
TYPEHARDNESS (ShC)TENSILE STRENGTH (MPa)BENDING STRENGTH (MPa)Impact
resistance
(J/m2* 104)
MODULUS OF ELASTICITY (GPa)
AT 35÷50 ~900 ~1800 10÷15 ~200
GAT, CAT,
GANT, CANT
40÷55 500÷800 900÷1400 2÷5 ~200
ASN, APN 40÷55 ~1000 ~1800 8÷12 ~200
ADSN 45÷60 ~600 ~1100 2÷5 ~200
APNK 50÷65 ~1200 ~2000 5÷10 ~200
Microstructure of roll materials
ATGATGANT
ASN, APNADSNAPNK
Characteristics
AT range covers rolls with diff erent amount of Cr-Mo elements. GAT (CAT) series has a greater amount of carbon. The level of carbon content establishes the carbides fraction and the type of the matrix that can moves from ferritic to pearlitic. GANT (CANT) rolls are similar to the GAT (CAT) grades but with the presence of graphite. ASN and APN series are eutectoid steel rolls with a good presence of Cr-Mo elements. They are characterized by a fi ne and prevalently pearlitic matrix where spheroidal carbides are evenly distributed. ADSN series (ADAMITE) are hypereutectoid Cr-Mo alloyed steel rolls characterized by a pearlitic/bainitic matrix whit fi ne spheroidal carbides uniformly distributed inside. APNK series are hypoeutectoid Cr-Mo alloyed steel rolls with high chromium content. They are characterized by a tempered bainitic/maertensitic structure.

Cast Steel data sheet

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