Longitudinal crack on the roll surface of 5% Cr steel
Grade: 5% Cr steel
Chemical composition in weight %: 0.68% C, 0.002% S, 0.022% P, 1.14% Si, 5.18% Cr, 0.17% Ni, 0.54% V, 0.030% W, 0.01% Co, 0.014% Ti, 0.015% Al, 0.15% Cu, 0.34% Mn, 1.22% Mo, 0.008% Sn.
Roll type: Work roll
Diameter(s): 143 mm
Hardness: No data
Roll production method: Forged steel
Defect(s) on the roll(s): Logitudinal crack, inclusions

crack
Fig. 9-1: Longitudinal crack on the roll surface.

crack
Fig. 9-3: Longitudinal crack on the roll, Mag. 10X.

SEM image
Fig. 9-4: SEM image of the inclusions in the roll surface near the crack.

SEM image
Fig. 9-5: SEM image of the inclusions in the roll surface near the crack.

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