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
Standards
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 |
|