HSS Roll Steel

Steel name: HSS roll
Diagram No.: 9553
Type of diagram: TTT
Chemical composition in weight %: 2.00-2.60% C, max. 1.20% Si, max. 1.20% Mn, 4.00-8.00% Cr, 3.00-6.00% Mo, 4.00-6.50% V, 3.00-6.00% W, 0.50-1.50% Nb, max. 0.50% Ti, max. 0.20% RE
Steel group: Roll steels
Note: TTT curve of HSS roll material. The critical points Ac1, Ms and Mf of the HSS roll material are 796 C, 131 C and <20 C, respectively. Figure illustrates the TTT curves of the HSS roll material. The beginning temperature of pearlite transformation is at about 640 C; the beginning temperature of bainite transformation is at about 320 C; the beginning temperature of martensitic transformation (Ms) is at about 131 C, while the ending temperature of martensitic transformation (Mf) is below the room temperature. The phase transformation of HSS rolls in the quenching is incomplete and gives certain amount of austenite retained in the quenched microstructure of HSS rolls.
Reference: Not shown in this demo version.

Transformation Diagram

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