Chemical composition in % of the material KH ( H, Х ) .
C
Si
Mn
Ni
S
P
Cr
Cu
0.95 - 1.1
0.1 - 0.4
0.15 - 0.45
max 0.35
max 0.03
max 0.03
1.3 - 1.65
max 0.3
Temperature of critical points of the grade KH ( H, Х ).
Ac1 = 745 , Ar1 = 700 , Mn = 240
Brinell hardness of the material KH ( H, Х ) (annealing) ,
HB 10 -1= 229 MPa
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