Chrome-nickel structural steel 18Х25Н19СЛ for castings (15H25N19SL)

for parts of steam and gas turbines, boiler plants, blades and crowns of compressors and nozzle apparatuses of turbines and other parts operating at high temperatures; austenitic steel

Classification

Country Section Category
CIS, Russia, Ukraine Steels and alloys for castings Steel for casting with special properties

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ni, % P, % C, % S, %
GOST 977-88 47.955–59.5 0.8–2 0.7–1.5 22–26 17–21 < 0.035 < 0.18 < 0.03

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$
20 204 14.8 13.8 7810

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{P}$$, $$MPa$$ $$\epsilon_L$$, % $$\psi$$, % Treatment
Castings 500 250 25 28 Hardening 1100 ° C, air cooling

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Round GOST 5949-18 207–212

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
Boundedly welded insensitive loathsome

Heat Treatment Modes

Treatment
Hardening 1090 - 1110 ° C, cooling in water, oil or air

Standards

Standard Description
GOST 977-88

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

Description of physical characteristics

Parameter Units of measurement Description
$$E\cdot 10^{9}$$ $$MPa$$ Elastic modulus
$$\alpha\cdot 10^{6}$$ $$K^{-1}$$ 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

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