Designation
| Name |
The value |
| Designation GOST Cyrillic |
12Х2НМЛ |
| Designation GOST Latin |
12X2HML |
| Transliteration |
12H2NML |
| By chemical elements |
12Cr2НMo |
| Name |
The value |
| Designation GOST Cyrillic |
ВКЛ-3М |
| Designation GOST Latin |
BKL-3M |
| Transliteration |
VKL-3M |
| By chemical elements |
WCoBe-3Mo |
Description
12Х2НМЛ steel is used: for the manufacture of casting parts of aviation, accurate methods of casting in ceramic form of constant models.
Note
Structural alloy steel.
Standards
| Name |
Code |
Standards |
| Steel castings |
В82 |
OST 1 90093-82 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
N |
Al |
Mo |
W |
Ce |
Mg |
| OST 1 90093-82 |
0.09-0.16 |
≤0.025 |
≤0.025 |
0.4-0.7 |
1.9-2.4 |
0.2-0.6 |
0.8-1.2 |
Rest |
≤0.3 |
≤0.015 |
≤0.08 |
0.35-0.45 |
≤0.2 |
0.05-0.1 |
0.01-0.05 |
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 |
| - |
980-1230 |
- |
- |
- |
285-388 |
30-38 |
| Casting. The preliminary heat treatment: anneal at 890-910 °C, cooling with the furnace to 680 °C, then air, or the normalization at 890-910 °C with following tempering at 670-690 °C to + Final heat treatment: Quenching in oil with 890-910 °C + Vacation at 540-560 °C, air cooling |
| ≥880 |
≥980 |
≥9 |
≥30 |
≥392 |
285-388 |
- |
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) |
