20HF (20HFA)
for medium-sized parts subjected to carburizing and hardening with low release (gears, piston pins, distribution rollers, plungers, copiers)
Classification
| Country | Section | Category |
|---|---|---|
| CIS, Russia, Ukraine | Structural steel | Alloyed structural steel |
Chemical composition
| Standard | Fe, % | Si, % | Mn, % | Cr, % | Cu, % | Ni, % | V, % | P, % | C, % | S, % |
|---|---|---|---|---|---|---|---|---|---|---|
| GOST 10702-78 | 96.8–98.43 | < 0.2 | 0.5–0.8 | 0.8–1.1 | < 0.3 | < 0.3 | 0.1–0.2 | < 0.035 | 0.17–0.23 | < 0.035 |
Information on suppliers
Physical characteristics
| Temperature, °C | $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ |
|---|---|
| 100 | 12 |
| 200 | 12.5 |
| 400 | 13 |
| 500 | 13.7 |
Brinell hardness number
Technological Properties
| Flake Susceptibility | Propensity to temper brittleness |
|---|---|
| insensitive | loathsome |
Critical point temperatures
| Ac1, K | Ac3(Acm), K |
|---|---|
| 768 | 840 |
Analogues
| Germany | USA |
|---|---|
| 22CrV4 | 6120 |
Standards
| Standard | Description |
|---|---|
| GOST 10702-78 |
Description of chemical elements
| Element | Units of measurement | Description |
|---|---|---|
| Fe | % | Iron |
| Si | % | Silicon |
| Mn | % | Manganese |
| Cr | % | Chrome |
| Cu | % | Copper |
| Ni | % | Nickel |
| V | % | Vanadium |
| P | % | Phosphorus |
| C | % | Carbon |
| S | % | Sulfur |
Description of physical characteristics
| Parameter | Units of measurement | Description |
|---|---|---|
| $$\alpha\cdot 10^{6}$$ | $$K^{-1}$$ | Coefficient of thermal (linear) expansion (range 20°C–T) |
Description of temperatures of critical points
| Parameter | Units of measurement | Description |
|---|---|---|
| Ac1 | K | |
| Ac3(Acm) | K |