20H17N2 (EP210)
Used in the aviation industry.
high-strength steel for heavy duty parts operating abrasion and impact; martensitic steel grade
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Corrosion-resistant alloys and steels | Corrosion-resistant ordinary steel |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Ni, % | P, % | C, % | S, % |
|---|---|---|---|---|---|---|---|---|
| GOST 5632-72 | 77.59–82.33 | < 0.8 | < 0.8 | 16–18 | 1.5–2.5 | < 0.035 | 0.17–0.25 | < 0.025 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Forgings | GOST 25054-81 | < 600 | 813 | 666 | 12–15 | 30–40 | 490–590 | Hardening and tempering |
Brinell hardness number
| Rolling | Standard | Classifiers | Value, HBW |
|---|---|---|---|
| Rod | GOST 5949-75 | annealing | 285 |
| Forgings | GOST 25054-81 | 248–293 |
Analogues
| USA | Germany |
|---|---|
| 431 | 1.4057 (X17CrNi16-2) |
Standards
| Standard | Description |
|---|---|
| GOST 5632-72 | |
| GOST 5949-75 | |
| TU 14-1-377-72 |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cr | % | Chrome |
| Ni | % | Nickel |
| 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 |