25H2NML
parts for heavy and transport engineering, working in conditions of low temperature and high load conditions; responsible welded-cast structures of large sections of career and draglines.
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Steels and alloys for castings | Ordinary steel for castings |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Cu, % | Ni, % | P, % | C, % | S, % | Mo, % |
|---|---|---|---|---|---|---|---|---|---|---|
| GOST 21357-87 | 95.06–96.68 | 0.2–0.4 | 0.5–0.8 | 1.6–1.9 | < 0.3 | 0.6–0.9 | < 0.02 | 0.22–0.3 | < 0.02 | 0.2–0.3 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\sigma_{P}$$, $$MPa$$ | $$\epsilon_L$$, % | $$\psi$$, % | Treatment |
|---|---|---|---|---|---|---|---|---|---|
| Castings | GOST 21357-87 | 800 | 700 | 12 | 25 | Hardening in water 860-880 ° C, 580-600 ° C and Holidays |
Heat Treatment Modes
| Treatment |
|---|
| Water hardening 860 - 880 ° C, Release 580 - 600 ° C |
Standards
| Standard | Description |
|---|---|
| GOST 21357-87 |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cr | % | Chrome |
| Cu | % | Copper |
| Ni | % | Nickel |
| P | % | Phosphorus |
| C | % | Carbon |
| S | % | Sulfur |
| Mo | % | Molybdenum |
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 |