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
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, %
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 $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$
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
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
Castings GOST 977-88 raw, fat, Cast, Transverse 230–250

Casting and technological parameters

linear shrinkage, %
2–3

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
no limits insensitive inclined

Heat Treatment Modes

Treatment
Normalization at 1050-1150 degrees. WITH
Steel 20Х25Н20С2 / Aloro

Standards

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
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
$$\alpha\cdot 10^{6}$$ $$K^{-1}$$ 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
$$\sigma _{U}$$ $$MPa$$ 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
linear shrinkage % The difference between model dimensions and the model casting

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