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Bearing Steel
Steel name: Bearing steel
Diagram No.: 8008
Type of diagram: TTT, CCT
Chemical composition in weight %: 0.36-0.40% C, 0.50-0.65% Si, 1.30-1.45% Mn, <0.025% P, 0.050-0.065% S, 0.10-0.20% Cr, <0.050% Mo, <0.15% Ni, <0.25% Cu, 0.013-0.017% N
Steel group: Bearing steels
Note: The phase transformation behaviour of the sample steel. (a) Displays the time-temperature austenitisation
diagram. Note the shifted transformation temperatures Ac1 and Ac3 at high heating rates, as
well as the split of Ac1 into a beginning and an end temperature (Ac1b and Ac1e). The heating rate associated
with the inductive surface hardening process is marked as K1000 and has a value of 81.67 K/s. (b) Shows the
continuous-cooling-transformation diagram evaluated for an austenitisation temperature of 1000 °C with 10 s
hold time. A – Austenite, F – Ferrite, P – Pearlite, B – Bainite, M – Martensite, MS – Martensite start, RA –
retained austenite, HV10 – Vickers hardness HV10, ë – time in seconds from 800 °C to 500 °C divided by 100, 3;
5; 8; … – percentages of final microstructure.
Reference: Not shown in this demo version.
Transformation Diagrams
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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.