TYPE
ArMo
HARDNESS CHEMICAL ANALYSIS MECHANICAL PROPERTIES
HB ShC C Si Mn Cr Ni Mo TENSILE STRENGHT (N/mm2) BENDING STRENGHT (N/mm2) MODULUS OF ELASTICITY (KN/mm2)
TNB 450 ∻ 555 64 ∻ 74 3.30 ∻ 3.70 0.40 ∻ 1.00 0.20 ∻ 0.70 <= 0.60 <= 0.60 0.15 ∻ 0.30 ~ 200 ~ 300 ~ 170
TNB-S 555 ∻ 640 74 ∻ 81 3.50 ∻ 3.90 0.40 ∻ 1.00 0.60 ∻ 1.00 0.50 ∻ 1.10 1.50 ∻ 3.00 0.20 ∻ 0.50 ~ 250 ~ 350 ~ 170

Specifications

The structure of clear chill cast iron rolls is made up of a non-continuous network of carbides in a pearlitic or bainitic/mertensitic matrix. Thanks to their high carbide ratio these rolls have an excellent wear resistance, whereas their resistance to thermal fatigue is reduced by the absence of free graphite. Rolls may be supplied as monobloc or as compund. For high hardness the use of compound rolls which can guarantee optimal properties in the working layer and in the core is raccomended.

Applications

Clear chill cast iron rolls are used for intermediate, pre-finishing and finishing stands of open and continuous mills for rod and wire-rod and pre-finishing and finishing stands for narrow strips. They are also used as guide rollers.

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