Chromium-nickel stainless steel 20X23H18 (EI417, H23N18)

Details of installations in the chemical. industrial gas pipelines, combustion chambers, burners up to 1050 degrees. Details of any kind in industrial furnaces, steam boilers and oil refining devices. Heat-resistant ML: blades, bandages up to 800grad. 7880kg / m3. OZL-6.

It is used for the manufacture of working and guide vanes, forgings and bandages operating at temperatures of 650−700 degrees, parts of combustion chambers and other furnace equipment operating at temperatures of 1000−1050 degrees.

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, %
GOST 5632-72 51.745–61 < 1 < 2 22–25 17–20 < 0.035 < 0.2 < 0.02

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Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20 204 13.8 7900 1
100 14.9 15.9 0.538
200 15.7
300 186 16.6 18.8
400 180 17.3 7760
500 173 17.5 7720
600 163 17.85 21.7 7670
700 153 17.85 7620
800 144
900 7540

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{P}$$, $$MPa$$ $$\epsilon_L$$, % $$\psi$$, % Treatment
Trumpet 212 x 60 Longitudinal 500 200 35 50 Hardening of 1100-1150 ° C, air
Rod GOST 5949-75 Longitudinal 490 196 35 50 Hardening of 1100-1150 ° C, air
The plates GOST 7350-77 540 265 35 Hardening of 1030-1130 ° C, cooling water
Sheet GOST 5582-75 510 245 35 Hardening of 1080-1150 ° C, cooling water
Sheet GOST 4986-79 570 19–38 Hardening of 1050-1080 ° C, air cooling

Technological Properties

Weldability
Boundedly welded
Steel 20X23H18 / Aloro

Standards

Standard Description
GOST 5632-72
GOST 5949-75
GOST 5582-75
GOST 7350-77
GOST 4986-79
TU 14-1-377-72

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
$$c\cdot 10^{-3}$$ $$\frac{J}{kg\cdot K}$$ The specific heat of the material (range 20°C–T)
$$R\cdot 10^{-6}$$ $$\Omega\cdot m$$ Electrical resistivity

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