Designation
| Name |
The value |
| Designation GOST Cyrillic |
27ХГСНМДТЛ |
| Designation GOST Latin |
27XGCHMDTL |
| Transliteration |
27HGSNMDTL |
| By chemical elements |
27CrMnСНMoCuTi |
| Name |
The value |
| Designation GOST Cyrillic |
27ХГСНМДТЛА |
| Designation GOST Latin |
27XGCHMDTLA |
| Transliteration |
27HGSNMDTLA |
| By chemical elements |
27CrMnСНMoCuTiBe |
Description
27KHGSNMDTL steel is used: for the manufacture of casting bits of rippers frozen soil rollers heavy bulldozers, the leading gear, sprocket track-type machines, and other details.
Note
Cold-resistant steel.
Standards
| Name |
Code |
Standards |
| Castings with special properties (iron and steel) |
В83 |
GOST 21357-87, TU 48-43-653-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
Ti |
Mo |
| GOST 21357-87 |
0.22-0.31 |
≤0.02 |
≤0.02 |
0.9-1.5 |
0.7-1.3 |
0.7-1.3 |
0.7-1.2 |
Rest |
0.3-0.5 |
0.03-0.07 |
0.1-0.3 |
Fe is the basis.
According to GOST 21357-87, the mass fraction of rare-earth metals (REM-yttrium, cerium, etc.) in steel should be in the range of 0.02-0.05%.
Mechanical properties
| sT|s0,2, MPa |
σU, MPa |
d |
y, % |
KCU, kJ/m2 |
HB, MPa |
| Casting. Quenching in water from 910-930 °C + vacation at 200-220 °C, air cooling (KCU-60). Steel is used as wear-resistant |
| ≥1150 |
≥1400 |
≥8 |
≥12 |
≥4 |
≥390 |
| Casting. Quenching in water from 910-930 °C + vacation at 640-660 °C, air cooling (KCU-60) |
| ≥700 |
≥850 |
≥12 |
≥25 |
≥5 |
- |
| Casting. Normalization at 910-930 °C + vacation at 590-610 °C, air cooling (KCU-60) |
| ≥650 |
≥800 |
≥12 |
≥20 |
≥5 |
- |
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 |
| d |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
| HB |
Brinell hardness number |
