Medium carbon structural stainless steel 20H21N46V8RL for the production of castings
| B | Boron | <0.06 |
| W | Tungsten | 7.0 — 9.0 |
| Fe | Iron | Rest |
| Si | Silicon | 0.2 — 0.8 |
| Mn | Manganese | 0.3 — 0.8 |
| Ni | Nickel | 43.0 — 48.0 |
| S | Sulfur | <0.035 |
| C | Carbon | 0.10 — 0.25 |
| P | Phosphorus | <0.04 |
| Cr | Chromium | 19.0 — 22.0 |
engine parts for the aviation industry; austenitic steel grade. In Russia, produced in accordance with the requirements of GOST 977−88
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Steels and alloys for castings | Steel for casting with special properties |
Chemical composition
| Standard | Fe, % | Si, % | B, % | Mn, % | Cr, % | Ni, % | P, % | C, % | S, % | W, % |
|---|---|---|---|---|---|---|---|---|---|---|
| GOST 977-88 | 19.015–30.4 | 0.2–0.8 | < 0.06 | 0.3–0.8 | 19–22 | 43–48 | < 0.04 | 0.1–0.25 | < 0.035 | 7–9 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling | Standard | Size, mm | Tension | Classifiers | $$\sigma _{U}$$, $$MPa$$ | $$\epsilon_L$$, % | $$\psi$$, % | $$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ | Treatment |
|---|---|---|---|---|---|---|---|---|---|
| Castings | GOST 977-88 | 441 | 6 | 8 | 294 |
Heat Treatment Modes
| Treatment |
|---|
| Aging 890 - 910 ° C, 5 h., Air cooling |
Standards
| Standard | Description |
|---|---|
| GOST 977-88 |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| B | % | Bor |
| Mn | % | Manganese |
| Cr | % | Chrome |
| Ni | % | Nickel |
| P | % | Phosphorus |
| C | % | Carbon |
| S | % | Sulfur |
| W | % | Tungsten |
Description of mechanical properties
| Parameter | Units of measurement | Description |
|---|---|---|
| $$\sigma _{U}$$ | $$MPa$$ | Ultimate tensile strength |
| $$\epsilon_L$$ | % | Elongation at break (longitudinal) |
| $$\psi$$ | % | Reduction in cross section on fracture |
| $$KCU\cdot 10^{3}$$ | $$\frac{J}{m^2}$$ | Impact toughness |