4H2NMF
Steel hard-to- weld, weakness to temper embrittlement. Flock sensitivity: insensitive. Hardness 4H2NMF normalized HB 10 -1 = 321 — 364 MPa. Substitute: 38H2NMF.
forging dies with height up to 700 mm cube hot forging parts from hard materials.
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 |
93.95–95.62 |
0.17–0.37 |
0.5–0.8 |
2–2.5 |
0.8–1.1 |
0.15–0.2 |
< 0.03 |
0.36–0.42 |
< 0.03 |
0.4–0.6 |
Information on suppliers
Technological Properties
| Weldability |
Flake Susceptibility |
Propensity to temper brittleness |
|---|
| Difficult to weld |
insensitive |
loathsome |
Critical point temperatures
| Ac1, K |
Ac3(Acm), K |
|---|
| 760 |
820 |
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 |
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 |
|