20FTL
responsible for cast parts automatic coupler and freight car bogies.
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Steels and alloys for castings | Steel for casting with special properties |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Ti, % | Cu, % | Ni, % | V, % | P, % | C, % | S, % |
|---|---|---|---|---|---|---|---|---|---|---|---|
| GOST 21357-87 | 97.025–98.71 | 0.3–0.5 | 0.8–1.2 | < 0.3 | 0.01–0.025 | < 0.3 | < 0.3 | 0.01–0.06 | < 0.02 | 0.17–0.25 | < 0.02 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{Y}$$, $$MPa$$ | $$\psi$$, % | d5, % | Treatment |
|---|---|---|---|---|---|---|---|---|---|
| Castings | GOST 21357-87 | 520 | 320 | 35 | 20 | Normalization 940 - 960 ° C | |||
| Castings | GOST 21357-87 | 570 | 450 | 30 | 15 | Water hardening 930 - 950 ° C, Release 600 - 650 ° C |
Heat Treatment Modes
| Treatment |
|---|
| Normalization 940 - 960 ° C |
| Water hardening 930 - 950 ° C, Release 600 - 650 ° C |
Standards
| Standard | Description |
|---|---|
| GOST 21357-87 |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cr | % | Chrome |
| Ti | % | Titan |
| Cu | % | Copper |
| Ni | % | Nickel |
| V | % | Vanadium |
| P | % | Phosphorus |
| C | % | Carbon |
| S | % | Sulfur |
Description of mechanical properties
| Parameter | Units of measurement | Description |
|---|---|---|
| d5 | % | Elongation at break |
| $$\sigma_{Y}$$ | $$MPa$$ | Yield strength |
| $$\sigma _{U}$$ | $$MPa$$ | Ultimate tensile strength |
| $$\psi$$ | % | Reduction in cross section on fracture |