Chemical composition in % of the material R12 ( R12, Р12 ) .
C
Si
Mn
Ni
S
P
Cr
Mo
W
V
Co
0.8 - 0.9
max 0.5
max 0.5
max 0.4
max 0.03
max 0.03
3.1 - 3.6
max 1
12 - 13
1.5 - 1.9
max 0.5
Temperature of critical points of the grade R12 ( R12, Р12 ).
Ac1 = 820 , Ac3(Acm) = 850 , Ar1 = 720
Brinell hardness of the material R12 ( R12, Р12 ) (annealing) ,
HB 10 -1= 255 MPa
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