EP979 (Sv-03XH25MDG)

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	P, %	C, %	S, %	Nb, %	Mo, %
TU 14-1-2571-78	38.487–47	< 0.25	1.5–2.5	22–25	< 0.1	2.5–3.5	24.5–27	< 0.02	< 0.025	< 0.018	< 0.1	2.5–3

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\varkappa$ , $\frac{W}{m\cdot K}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$	Cp, Дж/кг·К
20	192	13.4	0.175	490

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	d5, %	Treatment
Wire	GOST 5632-14	10	Transverse	raw, cold drawn, thin, Transverse	980–1050	480–540	35–40

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Wire	GOST 5632-14	raw, cold drawn, thin, Transverse	200–220

Technological Properties

Weldability	Flake Susceptibility	Propensity to temper brittleness
no limits	not sensitive	not inclined

Standards

Standard	Description
TU 14-1-2571-78

Description of chemical elements

Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Ti	%	Titan
Cu	%	Copper
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Nb	%	Niobium
Mo	%	Molybdenum

Description of physical characteristics

Parameter	Units of measurement	Description
Cp	Дж/кг·К	Specific heat of material
$E\cdot 10^{9}$	$MPa$	Elastic modulus
$\varkappa$	$\frac{W}{m\cdot K}$	Coefficient of thermal conductivity (the heat capacity of the material)
$R\cdot 10^{-6}$	$\Omega\cdot m$	Electrical resistivity

Description of mechanical properties

Parameter	Units of measurement	Description
d5	%	Elongation at break
$\sigma_{Y}$	$MPa$	Yield strength
$\sigma _{U}$	$MPa$	Ultimate tensile strength

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