20H8VL
parts fittings refineries, stove counterparts, pump housings and other parts operating in a highly sulfurous oil pressure environments at temperatures up to 575 degrees C; martensitic steel grade
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, % | P, % | C, % | S, % | W, % |
|---|---|---|---|---|---|---|---|---|
| GOST 977-88 | 87.825–90.5 | 0.3–0.6 | 0.3–0.5 | 7.5–9 | < 0.04 | 0.15–0.25 | < 0.035 | 1.25–1.75 |
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 | 589 | 392 | 16 | 30 | 392 | Annealing 950 ° C, Normalization 950 ° C, air cooling, and Holidays 680-720 ° C, air |
Heat Treatment Modes
| Treatment |
|---|
| Annealing 940 - 960 ° C, Normalization 940 - 960 ° C, air cooling; Holiday 680 - 720 ° C, air cooling |
Standards
| Standard | Description |
|---|---|
| GOST 977-88 |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cr | % | Chrome |
| P | % | Phosphorus |
| C | % | Carbon |
| S | % | Sulfur |
| W | % | Tungsten |
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 |