Designation
| Name |
The value |
| Designation GOST Cyrillic |
20ФТЛ |
| Designation GOST Latin |
20FTL |
| Transliteration |
20FTL |
| By chemical elements |
20VTi |
Description
Steel 20FTL is used: for the manufacture of critical cast parts of automatic coupler and freight car trucks.
Note
Timeless cold-resistant low-alloy steel.
Standards
| Name |
Code |
Standards |
| Castings with special properties (iron and steel) |
В83 |
GOST 21357-87 |
| Steel castings |
В82 |
TU 3-331-85 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
| GOST 21357-87 |
0.17-0.25 |
≤0.02 |
≤0.02 |
0.8-1.2 |
≤0.3 |
0.3-0.5 |
≤0.3 |
Rest |
≤0.3 |
0.01-0.06 |
0.01-0.025 |
Fe is the basis.
Mechanical properties
| sT|s0,2, MPa |
σU, MPa |
d |
y, % |
KCU, kJ/m2 |
| Casting. Quenching in water from 930-950 °C + vacation at 600-650 °C, air cooling (KCU-60) |
| ≥450 |
≥570 |
≥15 |
≥30 |
≥3 |
| Casting. Normalization at 940-960 °C, air cooling (KCU-60) |
| ≥320 |
≥520 |
≥20 |
≥35 |
≥3 |
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 |
| d |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
