12H25N16G7AR (EI835)

Turbine industry: details of gas pipeline systems, combustion chambers, diaphragms, sheet metal parts at t-re up to 1050 degrees. 7760kg / m3.

sheet, wire, tube, strip, parts operating up to 950 ° C at moderate voltages.

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Heat resistant steels and alloys	Heat resistant high alloy steel

Chemical composition

Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %
GOST 5632-72	47.815–57	< 1	< 0.01	5–7	23–26	15–18	< 0.035	< 0.12	< 0.02

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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	196.5		13.82	7820	1.06
100	189.4	16.6	15.07		1.1
200	181.5	16.2	16.33		1.17
300	174	16.8	17.59		1.2
400	166	17.4	19.26		1.24
500	159.5	18	20.94		1.28
600	149.5	18.3	22.19		1.31
700	141	18.5	23.87		1.33
800	133.5	18.7	25.54		1.36
900	130	18.9	27.63		1.39

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
Rod	GOST 5949-75	< 60			690	325	40	45	Hardening of 1050-1150 ° C, air cooling
The plates	GOST 7350-77				740	390	50		Hardening of 1050-1150 ° C, cooling water
Sheet	GOST 5582-75				980		35		Hardening of 1050-1100 ° C, cooling water
Sheet	GOST 4986-79				690		15–30		Hardening of 1050-1100 ° C, air
Profile			Longitudinal		700	330	40		Heating of 1100-1150 ° C, air

Technological Properties

Weldability
Weldability
no limits

Analogues

Germany	USA
Germany	USA
BGH 2.4951	SPEC MIL-E-21562 (EN6N)

Standards

Standard	Description
Standard	Description
GOST 5632-72
GOST 5949-75
GOST 5582-75
GOST 7350-77
GOST 4986-79
TU 14-1-225-72
TU 14-1-2478-78
TU 14-1-1747-76

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
B	%	Bor
Mn	%	Manganese
Cr	%	Chrome
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