22K
bottoms, flanges, welded one-piece drums and steam boilers. half couplings, pipes and other parts operating at temperatures from -40 to 450 ° C under pressure.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Structural steel |
Carbonaceous quality structural steel |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
Cu, % |
Ni, % |
P, % |
C, % |
S, % |
|---|
| GOST 5520-79 |
97.365–98.94 |
0.17–0.4 |
0.7–1 |
< 0.3 |
< 0.3 |
< 0.3 |
< 0.04 |
0.19–0.26 |
< 0.035 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$E\cdot 10^{9}$$, $$MPa$$ |
$$\alpha\cdot 10^{6}$$, $$K^{-1}$$ |
$$\varkappa$$, $$\frac{W}{m\cdot K}$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
$$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ |
$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$ |
|---|
| 20 |
211 |
|
51.7 |
7859 |
|
0.173 |
| 100 |
208 |
11.75 |
51 |
7834 |
0.47 |
0.219 |
| 200 |
205 |
12.2 |
48.5 |
7803 |
0.483 |
0.292 |
| 300 |
200 |
12.8 |
44.4 |
7770 |
|
0.381 |
| 400 |
191 |
13.2 |
42.7 |
7736 |
0.525 |
0.487 |
| 500 |
180 |
13.5 |
39.3 |
7699 |
0.571 |
0.601 |
| 600 |
165 |
13.85 |
35.6 |
7659 |
|
0.758 |
| 700 |
|
14.6 |
31.9 |
7617 |
|
0.925 |
| 800 |
|
12.7 |
25.9 |
7624 |
|
1.094 |
| 900 |
|
12.4 |
26.4 |
7600 |
|
1.135 |
| 1000 |
|
13.4 |
27.7 |
7548 |
|
1.167 |
| 1100 |
|
14.2 |
28.5 |
7496 |
|
1.194 |
| 1200 |
|
14.8 |
29.8 |
|
|
1.219 |
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{P}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ |
Treatment |
|---|
| Sheet |
|
60–90 |
|
|
440 |
|
|
600 |
Normalization of 940-960 ° C, and Holidays 630-650 ° C, air cooling 65 ° C / h |
| Sheet |
GOST 5520-79 |
|
|
|
430–590 |
255–265 |
22 |
590 |
|
Technological Properties
| Weldability |
Flake Susceptibility |
Propensity to temper brittleness |
|---|
| Boundedly welded |
not sensitive |
not inclined |
Critical point temperatures
| Ac1, K |
Ac3(Acm), K |
Ar3(Arcm), K |
Ar1, K |
|---|
| 724 |
845 |
815 |
682 |
Analogues
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Cu |
% |
Copper |
| 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) |
| $$KCU\cdot 10^{3}$$ |
$$\frac{J}{m^2}$$ |
Impact toughness |
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 |
|
|
Description of temperatures of critical points
| Parameter |
Units of measurement |
Description |
| Ac1 |
K |
|
| Ac3(Acm) |
K |
|
| Ar3(Arcm) |
K |
|
| Ar1 |
K |
|