Designation
| Name |
The value |
| Designation GOST Cyrillic |
68 |
| Designation GOST Latin |
68 |
| Transliteration |
68 |
| By chemical elements |
68 |
| Name |
The value |
| Designation GOST Cyrillic |
М68 |
| Designation GOST Latin |
M68 |
| Transliteration |
M68 |
| By chemical elements |
Mo68 |
Description
68 steel is used: for the manufacture of rails kontrrelsovye types RK75, RK65 and RK50, used in the construction of the permanent way with rail rail broad gauge.
Note
M68 — steel open-hearth rail.
Standards
| Name |
Code |
Standards |
| Rails. Lining. Lining. Crutches |
В42 |
GOST 9797-85, GOST 9798-85, GOST 18232-83, GOST 26110-84 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Fe |
| GOST 18232-83 |
0.62-0.73 |
≤0.045 |
≤0.035 |
0.7-1 |
0.13-0.28 |
Rest |
Fe is the basis.
The rails should be made from open-hearth steel, completely deoxidized, calm steel.
Mechanical properties
| Section, mm |
σU, MPa |
d5, % |
| Mechanical properties of steel for rails type RK75, RK65 and RK50 according to GOST 18232-83 on delivery |
|
≥840 |
≥7 |
Description mechanical marks
| Name |
Description |
| σU |
Limit short-term strength |
| d5 |
Elongation after rupture |
