Low-carbon constructional steel Kh15 alloyed with chrome (EI349, EZH27, X28)
Pipes for heat exchangers operating in aggressive environments. Sheet and bulk rental
welded structures that are not exposed to shock loads at operating temperatures not lower than -20 ° C; junction with glass. Equipment, parts, pipes of pyrolysis plants, heat exchangers. Pipes for heat exchangers operating in aggressive environments; ferritic steel
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Corrosion-resistant alloys and steels |
Corrosion-resistant heat-resistant steel |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
P, % |
C, % |
S, % |
|---|
| GOST 5632-72 |
67.99–73 |
< 1 |
< 0.8 |
27–30 |
< 0.035 |
< 0.15 |
< 0.025 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$E\cdot 10^{9}$$, $$MPa$$ |
$$\alpha\cdot 10^{6}$$, $$K^{-1}$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
|---|
| 20 |
200 |
|
7600 |
| 100 |
|
10 |
|
| 500 |
|
11 |
|
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\sigma_{P}$$, $$MPa$$ |
$$\epsilon_L$$, % |
$$\psi$$, % |
Treatment |
|---|
| Pipes are hot deformed. |
GOST 9940-81 |
|
|
|
441 |
|
17 |
|
|
| Rod |
GOST 5949-75 |
|
|
|
440 |
295 |
20 |
45 |
Annealing |
| Sheet |
GOST 5582-75 |
|
|
|
530 |
|
17 |
|
Annealing 740-780 ° C |
Technological Properties
| Weldability |
Propensity to temper brittleness |
|---|
| Boundedly welded |
inclined |
Analogues
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| 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) |
| $$\rho$$ |
$$\frac{kg}{m^3}$$ |
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 |
|
|