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 |
Information on suppliers
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
Technological Properties
| Weldability |
Flake Susceptibility |
Propensity to temper brittleness |
|---|
| no limits |
insensitive |
inclined |
Heat Treatment Modes
| Treatment |
|---|
| Normalization at 1050-1150 degrees. WITH |
Analogues
Standards
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 |
|
|