Designation
| Name |
The value |
| Designation GOST Cyrillic |
27ХГСНМЛ |
| Designation GOST Latin |
27XGCHML |
| Transliteration |
27HGSNML |
| By chemical elements |
27CrMnСНMo |
Description
27ХГСНМЛ steel is used: for the manufacture of casting parts of aviation, accurate methods of casting in ceramic form of constant models.
Note
High-strength structural alloy steel.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and General rules |
В20 |
OST 1 90005-91 |
| Steel castings |
В82 |
OST 1 90093-82 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
N |
Al |
Mo |
W |
| OST 1 90093-82 |
0.24-0.3 |
≤0.02 |
≤0.02 |
0.9-1.2 |
0.7-1 |
0.5-0.8 |
1.4-1.8 |
Rest |
≤0.3 |
≤0.015 |
≤0.08 |
0.2-0.35 |
≤0.2 |
Fe is the basis.
Mechanical properties
| sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
HB, MPa |
HRC |
| Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91 |
| - |
1270-1470 |
- |
- |
- |
363-478 |
39-45 |
| - |
1470-670 |
- |
- |
- |
385-515 |
45-52 |
| Casting. Normalization at 890-910 °C with following tempering at 670-690 °C, air cooling or partial annealing at 780 °C, cooling with the furnace to 670 °C, air cooling + Tempering in oil at 880-900 °C + Vacation at 200-240 °C |
| ≥1175 |
≥1470 |
≥7 |
≥20 |
≥294 |
415-515 |
- |
| Casting. Normalization at 890-910 °C with following tempering at 670-690 °C, air cooling or partial annealing at 780 °C, cooling with the furnace to 670 °C, air cooling + Tempering in saltpeter with 880-900 °C to 280-320 °C + Vacation at 250 °C |
| ≥980 |
≥1270 |
≥8 |
≥25 |
≥294 |
363-478 |
- |
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 |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
