EP983 (N68M)
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Corrosion-resistant alloys and steels | Corrosion-resistant heat-resistant steel |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Ti, % | Ni, % | Al, % | Ce, % | P, % | C, % | S, % | Mo, % | W, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2–3 | < 0.05 | < 0.5 | < 0.3 | < 0.1 | 68.245–72.945 | < 0.3 | 0.005 | < 0.015 | < 0.02 | < 0.015 | 25–27 | 0.05–0.45 |
Information on suppliers
Physical characteristics
| Temperature, °C | $$E\cdot 10^{9}$$, $$MPa$$ | $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ | Cp, Дж/кг·К |
|---|---|---|---|
| 20 | 202 | 12.4–16.7 | 456 |
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{Y}$$, $$MPa$$ | d5, % | Treatment |
|---|---|---|---|---|---|---|---|---|
| Round | GOST 5949-75 | 40 | Transverse | raw, hot rolling, fat, Transverse | 800–850 | 290–340 | 35–45 |
Magnetic properties
| Rolling | $$H_c$$, $$A/m$$ |
|---|---|
| Round | 1.522 |
Brinell hardness number
| Rolling | Standard | Classifiers | Value, HBW |
|---|---|---|---|
| Round | GOST 5949-18 | annealing, hot rolling, fat, Transverse | 300–350 |
Technological Properties
| Weldability | Flake Susceptibility | Propensity to temper brittleness |
|---|---|---|
| no limits | not sensitive | loathsome |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cr | % | Chrome |
| Ti | % | Titan |
| Ni | % | Nickel |
| Al | % | Aluminium |
| Ce | % | Cerium |
| P | % | Phosphorus |
| C | % | Carbon |
| S | % | Sulfur |
| Mo | % | Molybdenum |
| W | % | Tungsten |
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) |
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 |
|---|---|---|
| $$H_c$$ | $$A/m$$ | Magnetic coercivity (not more) |
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 |