Steel 90АФ (Э90АФ)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
90АФ |
| Designation GOST Latin |
90AF |
| Transliteration |
90AF |
| The chemical elements |
90NV |
| Name |
The value |
| Designation GOST Cyrillic |
Э90АФ |
| Designation GOST Latin |
E90AF |
| Transliteration |
Eh90AF |
| The chemical elements |
- |
Description
90АФ steel is used: for the manufacture of railway rails R65 and types R65K increased wear resistance and contact endurance.
Note
Э90АФ — steel electric furnace concast rail.
Standards
| Name |
Code |
Standards |
| Rails. Lining. Lining. Crutches |
В42 |
GOST 8161-75, TU 0921-125-01124328-2003 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Fe |
N |
Al |
V |
| TU 0921-125-01124328-2003 |
0.85-0.95 |
≤0.015 |
≤0.02 |
0.65-1.1 |
0.3-0.65 |
The rest |
0.012-0.02 |
≤0.005 |
0.08-0.15 |
Fe is the basis.
According to TU 0921-125-01124328-2003, the mass fraction of nitrogen is determined in finished rails. The mass fraction of oxygen, determined in finished rails, should not be more than 0.0035% total. Mass fraction of other elements - according to GOST R 51685. Tolerances in the finished rails of the content of elements from the standards indicated in the table - according to GOST R 51685.
Mechanical characteristics
| sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
| Rails after heat hardening, in the state of delivery |
| ≥900 |
≥1294 |
≥8 |
≥30 |
≥150 |
Description mechanical marks
| Name |
Description |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
