75HM
Steel is not used for welded structures, not prone to temper embrittlement. Flock sensitivity: insensitive. Substitute 9Х2.
working and supporting rolls of sheet mills for hot rolling of ferrous metals, the supporting rolls and two four-high stand sheet mills, cold rolling metal.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Tool steel |
Roll tool steel |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
Ni, % |
P, % |
C, % |
S, % |
Mo, % |
|---|
| OST 24.013.20 - 0 |
95.34–97.3 |
0.2–0.6 |
0.2–0.7 |
1.4–1.7 |
< 0.5 |
< 0.03 |
0.7–0.8 |
< 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 |
|
7900 |
|
| 100 |
45 |
|
0.49 |
| 200 |
41 |
|
0.5 |
| 300 |
40 |
|
0.53 |
| 400 |
39 |
|
0.57 |
| 500 |
38 |
|
0.64 |
| 600 |
37 |
|
0.75 |
| 700 |
35 |
|
0.9 |
| 800 |
|
|
0.7 |
| 900 |
|
|
0.76 |
| 1000 |
|
|
0.81 |
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{P}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$\psi$$, % |
$$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ |
Treatment |
|---|
| Metal rolling |
|
500 |
|
|
750 |
430 |
19 |
41 |
240 |
Double normalization with tempering |
Technological Properties
| Weldability |
Flake Susceptibility |
Propensity to temper brittleness |
|---|
| Not applicable for welded structures |
insensitive |
not inclined |
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Ni |
% |
Nickel |
| 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) |
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 |
| $$KCU\cdot 10^{3}$$ |
$$\frac{J}{m^2}$$ |
Impact toughness |
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 |
|
|