Chilled cast ironGRC, ECGR, CTD, CTI

The GRC and ECGR series are particularly suitable for the application as work rolls for last fi nishing stands of hot strip mills, for plate roughing and fi nishing mills and as back-up rolls for tandem cold mills. The CTD and CTI rolls are used as work rolls for pre- fi nishing and fi nishing stands for wire, rod, bar, small section and narrow strip mills. The CTI series are also used as intermediate rolls for wire and rod mills. The matrix structure and the opportune quantities of graphite and carbides in GRC and ECGR compound rolls ensure a high wear resistance of the rolls and a good surface aspect of the product. The presence of graphite gives a rapid heat transfer and hence a good resistance to thermal and mechanical shocks.

Chemical analysis
TYPECSiMnCrNiMoV, Nb, Ti
GRC, ECGR 3.00÷3.60 1.70÷1.20 0.40÷0.90 1.00÷2.00 4.00÷5.00 0.40÷0.60 UP TO 4.00
CTD 3.00÷3.60 0.30÷0.80 0.40÷0.80 0.50÷1.70 1.50÷3.50 0.10÷0.40 -
CTI 3.00÷3.60 0.70÷1.20 0.40÷0.80 0.50÷1.70 2.00÷4.50 0.20÷0.50 UP TO 1.00
Mechanical properties
TYPEHARDNESS (ShC)TENSILE STRENGTH (MPa)BENDING STRENGTH (MPa)COMPRESSIVE STRENGTH (MPa)Impact
resistance
(J/m2* 104)
MODULUS OF ELASTICITY (GPa)
GRC, ECGR 70÷80 ~450 ~700 ~2300 1.5÷3.0 ~180
CTD 60÷80 ~350 ~600 ~2000 1.5÷3.0 ~180
CTI 60÷80 ~400 ~650 ~2200 1.5÷3.0 ~180
Microstructure of roll materials
GRC (50x)ECGR (50x)CTD (50x)
GRC (200x)ECGR (200x)CTD (500x)
Characteristics
The GRC (CTI) compound rolls have an alloyed indefi nite chill cast iron shell, that consists of graphite and cementite around a bainitic/martensitic matrix. In order to increase the microhardness of the matrix is available a grade with primary hard carbides in the matrix (ECGR). The CTD series are characterized by the absence of graphite; the microstructure consists of a controlled quantity of carbides around a pearlitic or acicular matrix.

Chilled cast iron data sheet

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