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25MnSiNiMo, 20CrMnSiNiMo1, 20CrMnSiNiMo Steels
Steel name: 25MnSiNiMo, 20CrMnSiNiMo1, 20CrMnSiNiMo
Diagram No.: 5146
Type of diagram: CCT
DIN designation: 25MnSiNiMo, 20CrMnSiNiMo1, 20CrMnSiNiMo
Chemical composition in weight %:
MnSiNiMo (HY-TUF) steel: 0.24% C, 1.42% Si, 1.35% Mn, max. 0.025% P, S, 0.31% Cr, 0.40% Mo, 1.71% Ni
CrMnSiNiMo1 steel: 0.16% C, 0.76% Si, 0.67% Mn, max. 0.025% P, S, 2.55% Cr, 0.47% Mo, 2.31% Ni
CrMnSiNiMo2 steel: 0.18% C, 1.03% Si, 1.99% Mn, max. 0.025% P, S, 2.35% Cr, 0.34% Mo, 1.17% Ni
Steel group: Medium carbon steels
Note: The dilatometer tests of the steels under consideration were carried out to validate the predicted
CCT diagrams and to obtain the steel microstructures after the continuous cooling. The dilatometer
specimens (with diameter 4.0 mm and length about 10.0 mm) were machined from the steel bar.
The investigations were carried out using Linseis L78 “R.I.T.A.” dilatometer. The austenitization
temperature was 900 °C, the holding time was 15 min. The austenite transformation was obtained at
the constant cooling rates within the range 0.1-30 °C/s. The austenite transformation fraction was
estimated from the dilatometer curves using the methods described in literature. The critical
temperatures Ac1 and Ac3 of the steels under consideration determined from the dilatometer data are
presented are: 25MnSiNiMo steel: Ac1=765 C, Ac3=875 C. 20CrMnSiNiMo1 steel: Ac1=750 C, Ac3=760 C. 20CrMnSiNiMo steel: Ac1=765 C, Ac3=855 C.
Reference: Not shown in this demo version.
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