M68 (Steel 68)
For the manufacture of rails kontrrelsovyh types RK75, RK65, RK50 used in the top structure structures track with wide gauge railway tracks
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Steels for special purposes | Steel for rail transport |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | P, % | C, % | S, % |
|---|---|---|---|---|---|---|
| GOST 18232 - 83 | 97.91–98.55 | 0.13–0.28 | 0.7–1 | < 0.035 | 0.62–0.73 | < 0.045 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | d5, % | Treatment |
|---|---|---|---|---|---|---|---|
| Steel | GOST 18232 - 83 | 824–883 | 6–7 |
Standards
| Standard | Description |
|---|---|
| GOST 18232 - 83 |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| P | % | Phosphorus |
| C | % | Carbon |
| S | % | Sulfur |
Description of mechanical properties
| Parameter | Units of measurement | Description |
|---|---|---|
| d5 | % | Elongation at break |
| $$\sigma _{U}$$ | $$MPa$$ | Ultimate tensile strength |