Designation
| Name |
The value |
| Designation GOST Cyrillic |
20ГФЛ |
| Designation GOST Latin |
20GFL |
| Transliteration |
20GFL |
| By chemical elements |
20MnV |
| Name |
The value |
| Designation GOST Cyrillic |
20Г1ФЛ |
| Designation GOST Latin |
20G1FL |
| Transliteration |
20G1FL |
| By chemical elements |
20Mn1V |
Description
20ГФЛ steel is used: for the manufacture of frames, beams, housings, parts of cars and other details for various branches of engineering; for the manufacture of casting parts for gas turbines and axial compressors operating at temperatures from -50 to +350 °C; senior cast parts of automatic coupler and trucks of freight and passenger cars, electric and disulphoton and locomotives.
Note
Steel pearlitic class.
Standards
| Name |
Code |
Standards |
| Steel castings |
В82 |
GOST 977-88, OST 108.961.04-80, TU 24.05.486-82 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
| GOST 977-88 |
0.16-0.25 |
≤0.05 |
≤0.05 |
0.9-1.4 |
- |
0.2-0.5 |
- |
Rest |
- |
0.06-0.12 |
≤0.05 |
| TU 24.05.486-82 |
0.17-0.25 |
≤0.04 |
≤0.04 |
0.9-1.4 |
≤0.3 |
0.3-0.5 |
≤0.3 |
Rest |
≤0.3 |
0.07-0.13 |
- |
Fe is the basis.
Mechanical properties
| sT|s0,2, MPa |
σU, MPa |
d |
y, % |
KCU, kJ/m2 |
| Casting parts of gas turbines. Normalization at 930-970 °C, air cooling + vacation at 600-650 °C, air cooling |
| ≥314 |
≥510 |
≥17 |
≥25 |
≥490 |
| Casting parts well.d. composition. Normalizing or normalizing + vacation |
| 314-343 |
≥490 |
≥20 |
≥30 |
≥490 |
| ≥343 |
≥510 |
≥18 |
≥25 |
≥490 |
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 |
