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

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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
XH78T / Aloro

Standards

Standard Description
GOST 5632-72
TU 14-1-1671-76
TU 14-1-2752-79
TU 14-1-975-74
TU 14-1-4319-87
TU 14-1-4009-85
TU 14-1-895-74
TU 14-1-3942-85
GOST 14162-1979
GOST 24982-81
GOST 25054-81 GOST
GOST 5632-14
TU 1333-159-00220302-2011
TU 14-1-1214-75
TU 14-1-1530-75
TU 14-1-1531-76
TU 14-1-1747-76
TU 14-1-2902-80
TU 14-1-3957-85
TU 14-1-4296-87
TU 14-158-135-2003
TU 14-3-453-76
TU 14-3-453-2004
TU 14-3-520-2005
TU 14-3-520-76

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