9H2MF
Steel is not used for welded structures, prone to temper embrittlement. Flock sensitivity: sensitive. Temperature of critical points: Ac1 = 748, Ac3 (Acm) = 784, Ar3 (Arcm) = 685, Ar1 = 640, Mn = 175.
work rolls for cold rolling of metals under the most severe operating conditions, the work rolls and wire crimping section mills.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Tool steel |
Roll tool steel |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
Ni, % |
V, % |
P, % |
C, % |
S, % |
Mo, % |
|---|
| OST 24.013.20 - 0 |
94.69–96.7 |
0.25–0.5 |
0.2–0.7 |
1.7–2.1 |
< 0.5 |
0.1–0.2 |
< 0.03 |
0.85–0.95 |
< 0.03 |
0.2–0.3 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$\varkappa$$, $$\frac{W}{m\cdot K}$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
$$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ |
|---|
| 20 |
|
7840 |
|
| 100 |
37 |
|
0.44 |
| 200 |
34 |
|
0.46 |
| 300 |
32 |
|
0.5 |
| 400 |
32 |
|
0.57 |
| 500 |
32 |
|
0.68 |
| 600 |
30 |
|
0.8 |
| 700 |
23 |
|
0.94 |
| 800 |
20 |
|
1.1 |
| 900 |
14 |
|
0.5 |
| 1000 |
|
|
0.5 |
Technological Properties
| Weldability |
Flake Susceptibility |
Propensity to temper brittleness |
|---|
| Not applicable for welded structures |
sensitive |
inclined |
Critical point temperatures
| Ac1, K |
Ac3(Acm), K |
Ar3(Arcm), K |
Ar1, K |
Mn, K |
|---|
| 748 |
784 |
685 |
640 |
175 |
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 physical characteristics
| Parameter |
Units of measurement |
Description |
| $$\varkappa$$ |
$$\frac{W}{m\cdot K}$$ |
Coefficient of thermal conductivity (the heat capacity of the material) |
| $$\rho$$ |
$$\frac{kg}{m^3}$$ |
The density of the material |
| $$c\cdot 10^{-3}$$ |
$$\frac{J}{kg\cdot K}$$ |
The specific heat of the material (range 20°C–T) |
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 |
|
| Ar3(Arcm) |
K |
|
| Ar1 |
K |
|
| Mn |
K |
|