Designation
| Name |
The value |
| Designation GOST Cyrillic |
20ДХЛ |
| Designation GOST Latin |
20DXL |
| Transliteration |
20DHL |
| By chemical elements |
20CuCr |
Description
20DKHL steel is used: for the production of castings for critical loaded parts, which are requirements of high strength and sufficient toughness, working under static and dynamic loads.
Standards
| Name |
Code |
Standards |
| Steel castings |
В82 |
GOST 977-88, OST 3-4365-79 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Fe |
Cu |
| GOST 977-88 |
0.15-0.25 |
≤0.04 |
≤0.04 |
0.5-0.8 |
0.8-1.1 |
0.2-0.4 |
Rest |
1.4-1.6 |
Fe is the basis.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
HB, MPa |
| Annealing in air with 880-890 °C + vacation at 560-600 °C, air cooling |
| 100 |
≥540 |
≥638 |
≥12 |
≥30 |
≥392 |
- |
| Normalization with 880-890 °C + vacation at 560-600 °C, air cooling |
| 100 |
≥392 |
≥491 |
≥12 |
≥30 |
≥294 |
143-187 |
Description mechanical marks
| Name |
Description |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σU |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
| HB |
Brinell hardness number |
