EP622 (Sv-08H25N25M3)

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	Mo, %
TU 14-1-4968-91	39.985–49	< 0.4	1–2	23.5–26.5	23.5–26.5	< 0.02	< 0.08	< 0.015	3–4.5

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Physical characteristics

Temperature, °C	$$E\cdot 10^{9}$$, $$MPa$$	$$\alpha\cdot 10^{6}$$, $$K^{-1}$$	$$\rho$$, $$\frac{kg}{m^3}$$	Cp, Дж/кг·К
20	2.06	11.8–13.8	7950	495–510

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{Y}$$, $$MPa$$	d5, %	Treatment
Round	TU 14-1-4968-91	40	Transverse	raw, hot rolling, Transverse	1040	960	12–14

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Round	TU 14-1-4968-91	raw, hot rolling, Transverse	225–230

Technological Properties

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

Limit operating modes

Standard	Температура, °C
TU 14-1-4968-91	350–450

Long-term strength

Standard	Treatment	Постоянно приложенное напряжение, МПа
TU 14-1-4968-91		> 650

Standards

Standard	Description
TU 14-1-4968-91

Description of chemical elements

Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
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
$$\alpha\cdot 10^{6}$$	$$K^{-1}$$	Coefficient of thermal (linear) expansion (range 20°C–T)
$$\rho$$	$$\frac{kg}{m^3}$$	The density of the material

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