40H5MF (3H2V8F)
Steel difficult to weld, little prone to temper brittleness. Flock sensitivity is insensitive. Temperature of critical points: Ac1 = 810, Ac3 (Acm) = 855.
critical parts forging and stamping tools with high strength properties after normalization and tempering: container sleeve, ring, ram, needles and other parts operating at temperatures up to 500 ° C.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Tool steel |
Die tool steel |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
Ni, % |
V, % |
P, % |
C, % |
S, % |
Mo, % |
|---|
| TU 24-1-12-180 - 0 |
90.32–92.88 |
0.17–0.37 |
0.5–0.8 |
4.5–5.5 |
< 0.3 |
0.4–0.6 |
< 0.03 |
0.35–0.45 |
< 0.03 |
1.2–1.6 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{P}$$, $$MPa$$ |
$$\epsilon_L$$, % |
Treatment |
|---|
| Round |
|
< 400 |
|
|
1400 |
1300 |
7 |
Normalized and tempered |
Technological Properties
| Weldability |
Flake Susceptibility |
Propensity to temper brittleness |
|---|
| Difficult to weld |
insensitive |
loathsome |
Critical point temperatures
| Ac1, K |
Ac3(Acm), K |
|---|
| 810 |
855 |
Analogues
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Ni |
% |
Nickel |
| V |
% |
Vanadium |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
| Mo |
% |
Molybdenum |
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) |
Designation of types of weldability
| Parameter |
Units of measurement |
Description |
| no limits |
|
Welding is performed without heating and without subsequent heat treatment |
| Boundedly welded |
|
Welding is possible with heating up to 100–120 °C and subsequent heat treatment |
| Difficult to weld |
|
For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing |
| Not applicable for welded structures |
|
|
Description of temperatures of critical points
| Parameter |
Units of measurement |
Description |
| Ac1 |
K |
|
| Ac3(Acm) |
K |
|