Designation
| Name |
The value |
| Designation GOST Cyrillic |
20Х25Н20С |
| Designation GOST Latin |
20X25H20C |
| Transliteration |
20H25N20S |
| By chemical elements |
20Cr25Ni20Pb |
Description
Alloy 20Х25Н20С used: for the manufacture of pipes tsentrobezhnolityh for the manufacture of the coils of the tubular furnace installations production of ammonia, hydrogen, ethylene, carbon disulphide, etc., operating in the temperature range 760−1060 °C and a pressure of 3.92 MPa (40 kgf/cm2); seamless hot — and cold-drawn pipes used in the production of ammonia, hydrogen, methanol, ethylene, carbon disulphide etc.
Standards
| Name |
Code |
Standards |
| Steel pipes and fittings to them |
В62 |
TU 1333-047-00220302-02, TU 1320-003-18648658-00 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
As |
Al |
V |
Ti |
Mo |
Zn |
Sn |
Pb |
| TU 1320-003-18648658-00 |
0.2-0.25 |
≤0.03 |
≤0.03 |
0.8005-1.51 |
23-27 |
1.1995-1.74 |
19-22 |
Rest |
≤0.2 |
≤0.01 |
0.0005-0.1 |
0.0005-0.2 |
0.0005-0.1 |
≤0.5 |
≤0.01 |
≤0.01 |
≤0.01 |
Fe is the basis.
Mechanical properties
| sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
| Seamless pipes hot and cold-of an external diameter 25-168 mm. Quenching in water or air from 1100-1150 °C |
| ≥245 |
≥441 |
≥10 |
≥10 |
| Tsentrobezhnolityh pipe outer diameter 85-320 mm. Quenching in water or air from 1100-1150 °C |
| ≥245 |
≥441 |
≥10 |
≥10 |
Description mechanical marks
| Name |
Description |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σU |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
