Steel 20FL
Designation
| Name |
The value |
| Designation GOST Cyrillic |
20ФЛ |
| Designation GOST Latin |
20FL |
| Transliteration |
20FL |
| The chemical elements |
20V |
Description
Steel 20FL used: for the manufacture of castings of large parts of freight cars (the body of the coupler, draw clamp, beam bolster and side frame of the truck); castings metallurgical and mining equipment; responsible cast parts of automatic coupler and trucks of freight and passenger cars, electric and disulphoton and locomotives.
Standards
| Name |
Code |
Standards |
| Castings, steel |
В82 |
GOST 977-88, TU 24.05.486-82 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
| GOST 977-88 |
0.14-0.25 |
≤0.05 |
≤0.05 |
0.7-1.2 |
- |
0.2-0.52 |
- |
The rest |
- |
0.06-0.12 |
| TU 24.05.486-82 |
0.17-0.25 |
≤0.04 |
≤0.04 |
0.8-1.2 |
≤0.3 |
0.3-0.5 |
≤0.3 |
The rest |
≤0.3 |
0.07-0.13 |
Fe is the basis.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d |
y, % |
kJ/m2, кДж/м2 |
| Without heat treatment |
| 6 |
≥355 |
≥610 |
≥22 |
≥47 |
- |
| Casting parts well.d. composition. Normalizing or normalizing + vacation |
| - |
294-343 |
≥490 |
≥20 |
≥30 |
≥490 |
| Normalization at 1170 °C + normalization at 940 °C + vacation at 650 °C |
| 6 |
≥405 |
≥620 |
≥25 |
≥58 |
- |
| Casting parts well.d. composition. Normalizing or normalizing + vacation |
| - |
≥343 |
≥510 |
≥18 |
≥25 |
≥490 |
| Casting. Normalization at 920-960 °C + vacation at 600-650 °C, air cooling |
| 100 |
≥294 |
≥490 |
≥18 |
≥35 |
≥490 |
| Normalization at 940 °C |
| 6 |
≥320 |
≥550 |
≥29 |
≥62 |
- |
| Normalization at 940 °C + vacation at 650 °C, air cooling |
| 6 |
≥355 |
≥530 |
≥27 |
≥59 |
- |
| Thermal Cycling: normalization at 1070 °C, air cooling + vacation at 520 °C, air cooling + normalizing at 870 °C, air cooling + vacation at 520 °C, air cooling + normalization at 850 °C, air cooling + vacation at 520 °C, air cooling + normalization at 810 °C, air cooling |
| 6 |
≥440 |
≥635 |
≥25 |
≥56 |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
