Cr-Ni-Mo- steel for applications requiring high tensile and toughness values, in particular in large cross sections in the quenched and tempered condition. The molybdenum addition prevents the steel from being susceptible to temper brittleness.
S - BS - BS
BS : S97 - S140 - S154
C - Si - Mn - Cr - Mo - Ni - Al
0.31 - 0.25 - 0.60 - 0.65 - 0.60 - 2.60 - 0.02