XH78T (EI435)
Details of aircraft engines. Low-loaded critical parts with workers. t up to 1000−1100grad: fire tubes, combustion chambers, gas ducts, covers of thermocouples. 8400kg / m3. OZL-25, OZL-25B, TsT-28.
varietal parts, tubes, running to a temperature of 1100 ° C.
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Heat resistant steels and alloys | Heat resistant alloys |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Ti, % | Ni, % | P, % | C, % | S, % |
|---|---|---|---|---|---|---|---|---|---|
| GOST 5632-72 | < 6 | < 0.8 | < 0.7 | 19–22 | 0.15–0.35 | 70.003–80.85 | < 0.015 | < 0.12 | < 0.012 |
Information on suppliers
Physical characteristics
| Temperature, °C | $$E\cdot 10^{9}$$, $$MPa$$ | $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ | $$\varkappa$$, $$\frac{W}{m\cdot K}$$ | $$\rho$$, $$\frac{kg}{m^3}$$ | $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$ |
|---|---|---|---|---|---|
| 20 | 224 | 8400 | 1.09 | ||
| 100 | 219 | 12.2 | 14.6 | 8380 | 1.099 |
| 200 | 213 | 13 | 16.7 | 8340 | 1.108 |
| 300 | 206 | 13.4 | 18.5 | 8310 | 1.117 |
| 400 | 200 | 13.8 | 20.6 | 8260 | 1.127 |
| 500 | 193 | 14.1 | 22.7 | 8220 | 1.153 |
| 600 | 184 | 14.7 | 24.8 | 8180 | 1.135 |
| 700 | 15.4 | 26.8 | 8130 | 1.126 | |
| 800 | 15.5 | 28.9 | 8090 | 1.123 | |
| 900 | 8040 |
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{P}$$, $$MPa$$ | $$\epsilon_L$$, % | $$\psi$$, % | Treatment |
|---|---|---|---|---|---|---|---|---|---|
| Sheet | GOST 24982-81 | < 3.9 | 860 | 35 | Hardening of 980-1020 ° C, air cooling | ||||
| Sheet | GOST 24982-81 | 4–11 | 880 | 30 | Hardening of 980-1020 ° C, air cooling | ||||
| Forgings | GOST 25054-81 | < 600 | 588 | 196 | 25–30 | 35–40 | hardening |
Brinell hardness number
| Rolling | Standard | Classifiers | Value, HBW |
|---|---|---|---|
| Alloy | GOST 25054-81 | Hardening | 200 |
Technological Properties
| Weldability |
|---|
| Difficult to weld |
Analogues
| Germany | USA |
|---|---|
| 2.4951 | N06025 |
| 2.463 (NiCr20Ti) |
Standards
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cr | % | Chrome |
| Ti | % | Titan |
| Ni | % | Nickel |
| 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 |
| $$R\cdot 10^{-6}$$ | $$\Omega\cdot m$$ | Electrical resistivity |
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 |
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 |