20DHL
responsible loaded parts, which are requirements of high strength and toughness sufficient working under the influence of static and dynamic loads
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Steels and alloys for castings | Ordinary steel for castings |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Cu, % | P, % | C, % | S, % |
|---|---|---|---|---|---|---|---|---|
| GOST 977-88 | 95.77–96.95 | 0.2–0.4 | 0.5–0.8 | 0.8–1.1 | 1.4–1.6 | < 0.04 | 0.15–0.25 | < 0.04 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{P}$$, $$MPa$$ | $$\epsilon_L$$, % | $$\psi$$, % | $$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ | Treatment |
|---|---|---|---|---|---|---|---|---|---|---|
| Castings | GOST 977-88 | 491 | 392 | 12 | 30 | 294 | Normalization of 880-890 ° C, 560-600 ° C and Holidays | |||
| Castings | GOST 977-88 | 638 | 540 | 12 | 30 | 392 | Tempering 880-890 ° C, 560-600 ° C and Holidays |
Brinell hardness number
Heat Treatment Modes
| Treatment |
|---|
| Normalization 880 - 890 ° C, Vacation 560 - 600 ° C |
| Tempering 880 - 890 ° C, Vacation 560 - 600 ° C |
Standards
| Standard | Description |
|---|---|
| GOST 977-88 |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cr | % | Chrome |
| Cu | % | Copper |
| P | % | Phosphorus |
| C | % | Carbon |
| S | % | Sulfur |
Description of mechanical properties
| Parameter | Units of measurement | Description |
|---|---|---|
| $$\sigma _{U}$$ | $$MPa$$ | Ultimate tensile strength |
| $$\sigma_{P}$$ | $$MPa$$ | Proportionality limit |
| $$\epsilon_L$$ | % | Elongation at break (longitudinal) |
| $$\psi$$ | % | Reduction in cross section on fracture |
| $$KCU\cdot 10^{3}$$ | $$\frac{J}{m^2}$$ | Impact toughness |