α⋅106
K−1
ϰ
Wm⋅K
ρ
kgm3
σU
MPa
σP
MPa
ϵL
ψ

Steel chrome-nickel constructional 20H25N20S2 (EI283, X25N20C2)

It is used for the manufacture of parts for furnaces operating at temperatures up to 1100 ° C in air and hydrocarbon atmospheres.

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, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %	W, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	V, %	P, %	C, %	S, %	Mo, %	W, %
GOST 5632-72	46.045–56	2–3	< 1.5	24–27	< 0.2	< 0.3	18–21	< 0.2	< 0.035	< 0.2	< 0.02	< 0.3	< 0.2

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Physical characteristics

Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$
Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$
20			7720
100	16.1	15	7680
500		22
600	17.8	24
700	17.8	25
800	18.1	27	7440
900	18.5	29	7390
1000	18.8

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			590	295	35	50	Hardening of 1100-1150 ° C, air
Sheet	GOST 5582-75				490		35		Hardening of 1050-1100 ° C, cooling water

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Castings	GOST 977-88	raw, fat, Cast, Transverse	230–250

Casting and technological parameters

linear shrinkage, %
linear shrinkage, %
2–3

Technological Properties

Weldability	Flake Susceptibility	Propensity to temper brittleness
Weldability	Flake Susceptibility	Propensity to temper brittleness
no limits	insensitive	inclined

Heat Treatment Modes

Treatment
Treatment
Normalization at 1050-1150 degrees. WITH

Analogues

Germany	USA
Germany	USA
1.4841	310
1.4841 (X15CrNiSi25-20)

Standards

Standard	Description
Standard	Description
GOST 5632-72
GOST 5949-75
GOST 5582-75
TU 14-1-5350-97
TU 14-1-2240

Description of chemical elements

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

Description of physical characteristics

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\alpha\cdot 10^{6}$	$K^{-1}$	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
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\sigma_{P}$	$MPa$	Proportionality limit
$\epsilon_L$	%	Elongation at break (longitudinal)
$\psi$	%	Reduction in cross section on fracture

Description of the casting and technological parameters

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
linear shrinkage	%	The difference between model dimensions and the model casting

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