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
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, %
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	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
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
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
Rolling	Standard	Classifiers	Value, HBW
Alloy	GOST 25054-81	Hardening	200

Technological Properties

Weldability
Weldability
Difficult to weld

Analogues

Germany	USA
Germany	USA
2.4951	N06025
2.463 (NiCr20Ti)

Standards

Standard	Description
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
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
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
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
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