EP615 (XH77SR1)

Classification

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

Chemical composition

Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	Al, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	Al, %	P, %	C, %	S, %
	< 3	2.5–3	0.8–1.2	< 0.4	13–15	< 0.2	< 0.25	75.715–83.3	< 0.5	< 0.02	0.4–0.7	< 0.015

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Physical characteristics

Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	Cp, Дж/кг·К
Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	Cp, Дж/кг·К
20	13–16	55.8–65.8	8050	456

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{0.2}$ , $MPa$	d5, %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{0.2}$ , $MPa$	d5, %	Treatment
Tape	GOST 19241-80	1	Transverse	raw, cold rolling, thin, Transverse	800–850	580–630	0.5–1.5

Magnetic properties

Rolling	$\mu_{max}$ , $MH/m$	$P_{1.5/50}$ , $W/kg$
Rolling	$\mu_{max}$ , $MH/m$	$P_{1.5/50}$ , $W/kg$
Tape	< 4000	1.5–1.6

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Rolling	Standard	Classifiers	Value, HRC
Rolling	Standard	Classifiers	Value, HRC
Tape	GOST 492-2006	half-firm, cold rolling, thin, Transverse	40–45

Technological Properties

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

Critical point temperatures

Ac₃(Ac_m), K
Ac₃(Ac_m), K
760–800

Limit operating modes

Standard	Температура, °C
Standard	Температура, °C
GOST 492-2006	500–650

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
B	%	Bor
Mn	%	Manganese
Cr	%	Chrome
Ti	%	Titan
Cu	%	Copper
Ni	%	Nickel
Al	%	Aluminium
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur

Description of physical characteristics

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
Cp	Дж/кг·К	Specific heat of material
$\alpha\cdot 10^{6}$	$K^{-1}$	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

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
d5	%	Elongation at break
$\sigma_{0.2}$	$MPa$	Tensile stress required to produce a total elongation of 0.2%
$\sigma _{U}$	$MPa$	Ultimate tensile strength

Description of magnetic properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\mu_{max}$	$MH/m$	Magnetic permeability (not more)
$P_{1.5/50}$	$W/kg$	Specific magnetic losses (no more) while the magnetic induction is 1.5 T and frequency is 50 Hz

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

Description of temperatures of critical points

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
Ac₃(Ac_m)	K