X12M

Temperature of critical points: Ac1 = 830, Ac3 (Acm) = 855, Ar1 = 750, Mn = 230. Hardness after annealing: HB 10 -1 = 255 MPa .

for the manufacture of rolling rollers, wire drawing boards and drawing dies, eyelets for calibrating metal; punches and dies punching dies; punches and dies of cold extrusion operated with operating pressures up to 1400−1600 MPa

Classification

Country Section Category
CIS, Russia, Ukraine Tool steel Die tool steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % V, % P, % C, % S, % Mo, %
GOST 5950-73 84.14–86.7 0.15–0.35 0.15–0.4 11–12.5 0.15–0.3 < 0.03 1.45–1.65 < 0.03 0.4–0.6

Information on suppliers

Physical characteristics

Temperature, °C \alpha\cdot 10^{6}, K^{-1} \rho, \frac{kg}{m^3} R\cdot 10^{-6}, \Omega\cdot m
20 7700 0.58
100 10.9

Critical point temperatures

Ac1, K Ac3(Acm), K Ar1, K Mn, K
830 855 750 230

Analogues

USA Germany Japan
D2 1.2601 (X165CrMoV12) SKD11

Standards

Standard Description
GOST 5950-73

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
V % Vanadium
P % Phosphorus
C % Carbon
S % Sulfur
Mo % Molybdenum

Description of physical characteristics

Parameter Units of measurement Description
\alpha\cdot 10^{6} K^{-1} Coefficient of thermal (linear) expansion (range 20°C–T)
\rho \frac{kg}{m^3} The density of the material
R\cdot 10^{-6} \Omega\cdot m Electrical resistivity

Description of temperatures of critical points

Parameter Units of measurement Description
Ac1 K
Ac3(Acm) K
Ar1 K
Mn K