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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