EP644
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Heat resistant steels and alloys | Heat resistant high alloy steel |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Ni, % | V, % | P, % | C, % | S, % |
|---|---|---|---|---|---|---|---|---|---|
| 54.525–61.35 | < 0.7 | 25–28 | 12.5–14.5 | < 0.6 | 0.8–1.2 | < 0.035 | 0.35–0.42 | < 0.02 |
Information on suppliers
Physical characteristics
| Temperature, °C | $$E\cdot 10^{9}$$, $$MPa$$ | $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ | $$\varkappa$$, $$\frac{W}{m\cdot K}$$ | $$\rho$$, $$\frac{kg}{m^3}$$ |
|---|---|---|---|---|
| 20 | 200 | 11.8–12.2 | 14.2 | 7860 |
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{Y}$$, $$MPa$$ | d5, % | Treatment |
|---|---|---|---|---|---|---|---|---|
| Round | GOST 5632-14 | 40 | Transverse | raw, hot rolling, fat, Transverse | 1300–1650 | 760–820 | 10–15 |
Твёрдость по Роквеллу
| Rolling | Standard | Classifiers | Value, HRC |
|---|---|---|---|
| Round | GOST 5632-14 | raw, hot rolling, fat, Transverse | 48–54 |
Technological Properties
| Weldability | Flake Susceptibility | Propensity to temper brittleness |
|---|---|---|
| Boundedly welded | sensitive | loathsome |
Coefficients of Friction
| coefficient of friction with lubrication |
|---|
| 0.08–0.12 |
Limit operating modes
| Standard | Температура, °C | Рекомендованная твердость вала, $$HB$$ |
|---|---|---|
| GOST 5632-14 | 80–100 | 52–54 |
Heat Treatment Modes
| Treatment |
|---|
| quenching 860gr (oil), tempering 550gr (water) |
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 |
Description of physical characteristics
| Parameter | Units of measurement | Description |
|---|---|---|
| $$E\cdot 10^{9}$$ | $$MPa$$ | Elastic modulus |
| $$\alpha\cdot 10^{6}$$ | $$K^{-1}$$ | Coefficient of thermal (linear) expansion (range 20°C–T) |
| $$\varkappa$$ | $$\frac{W}{m\cdot K}$$ | Coefficient of thermal conductivity (the heat capacity of the material) |
| $$\rho$$ | $$\frac{kg}{m^3}$$ | The density of the material |
Description of mechanical properties
| Parameter | Units of measurement | Description |
|---|---|---|
| d5 | % | Elongation at break |
| $$\sigma_{Y}$$ | $$MPa$$ | Yield strength |
| $$\sigma _{U}$$ | $$MPa$$ | Ultimate tensile strength |
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 |