2H6V8M2K8 (EP745)
The temperature of critical points Ac1 = 827, Ac3 (Acm) = 890, Mn = 180. Hardness after high tempering HB 1 0 -1 = 250 MPa.
needle punches for pressing heat-resistant and corrosion-resistant steels and alloys, and titanium alloys at temperatures up to 650−675 degrees C performed without intensive cooling
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Tool steel |
Die tool steel |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Co, % |
Cr, % |
V, % |
P, % |
C, % |
S, % |
Mo, % |
W, % |
|---|
|
72.59–76.43 |
0.3–0.6 |
0.15–0.4 |
7.5–8.5 |
6.5–7 |
0.1–0.25 |
< 0.03 |
0.22–0.3 |
< 0.03 |
1.8–2.3 |
7–8 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{P}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$\psi$$, % |
Treatment |
|---|
| Metal rolling |
|
15 |
|
|
1750 |
1450 |
2 |
6 |
Hardening 1180 ° C, oil, and Holidays |
Brinell hardness number
| Rolling |
Standard |
Classifiers |
Value, HBW |
| Alloy |
|
high leave |
250 |
Critical point temperatures
| Ac1, K |
Ac3(Acm), K |
Mn, K |
|---|
| 827 |
890 |
180 |
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Co |
% |
Cobalt |
| Cr |
% |
Chrome |
| V |
% |
Vanadium |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
| Mo |
% |
Molybdenum |
| W |
% |
Tungsten |
Description of mechanical properties
| Parameter |
Units of measurement |
Description |
| $$\sigma _{U}$$ |
$$MPa$$ |
Ultimate tensile strength |
| $$\sigma_{P}$$ |
$$MPa$$ |
Proportionality limit |
| $$\epsilon_L$$ |
% |
Elongation at break (longitudinal) |
| $$\psi$$ |
% |
Reduction in cross section on fracture |
Description of temperatures of critical points
| Parameter |
Units of measurement |
Description |
| Ac1 |
K |
|
| Ac3(Acm) |
K |
|
| Mn |
K |
|