EP977 (44NHMT)
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Heat resistant steels and alloys | Heat resistant alloys |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Ti, % | Ni, % | Al, % | P, % | C, % | S, % | Mo, % |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 44.51–48.8 | 0.1–0.4 | 0.2–0.4 | 4.3–5.1 | 2.6–3.2 | 43.4–45 | 0.5–1 | < 0.02 | < 0.05 | < 0.02 | 0.1–0.3 |
Information on suppliers
Physical characteristics
| Temperature, °C | $$E\cdot 10^{9}$$, $$MPa$$ | $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ | $$\rho$$, $$\frac{kg}{m^3}$$ | Cp, Дж/кг·К |
|---|---|---|---|---|
| 20 | 200 | 12.1–12.6 | 7950 | 488 |
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{Y}$$, $$MPa$$ | d5, % | Treatment |
|---|---|---|---|---|---|---|---|---|
| Tape | GOST 10994-74 | <2.0 | Transverse | raw, cold rolling, thin, Transverse | > 950 | > 600 | 5–10 |
Magnetic properties
| Rolling | $$B_{2500}$$, $$T$$ |
|---|---|
| Tape | > 9000 |
Твёрдость по Роквеллу
| Rolling | Standard | Classifiers | Value, HRC |
|---|---|---|---|
| Tape | GOST 10994-74 | raw, cold rolling, thin, high strength, Transverse | 45–48 |
Technological Properties
| Weldability | Flake Susceptibility | Propensity to temper brittleness |
|---|---|---|
| Boundedly welded | not sensitive | not inclined |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cr | % | Chrome |
| Ti | % | Titan |
| Ni | % | Nickel |
| Al | % | Aluminium |
| P | % | Phosphorus |
| C | % | Carbon |
| S | % | Sulfur |
| Mo | % | Molybdenum |
Description of physical characteristics
| Parameter | Units of measurement | Description |
|---|---|---|
| Cp | Дж/кг·К | Specific heat of material |
| $$E\cdot 10^{9}$$ | $$MPa$$ | Elastic modulus |
| $$\alpha\cdot 10^{6}$$ | $$K^{-1}$$ | Coefficient of thermal (linear) expansion (range 20°C–T) |
| $$\rho$$ | $$\frac{kg}{m^3}$$ | 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 |
Description of magnetic properties
| Parameter | Units of measurement | Description |
|---|---|---|
| $$B_{2500}$$ | $$T$$ | Magnetic induction (not less) in a magnetic field while magnetic field strength is 2500 A/m |
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 |