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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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Disclaimer: The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.