Designation
| Name |
The value |
| Designation GOST Cyrillic |
12Х7Г3СЛ |
| Designation GOST Latin |
12X7G3CL |
| Transliteration |
12H7G3SL |
| By chemical elements |
12Cr7Mn3С |
Description
12KH7G3SL steel is used: for the manufacture of castings for critical heavily loaded parts with wall thickness up to 100 mm, operating in conditions of static and dynamic loads.
Standards
| Name |
Code |
Standards |
| Steel castings |
В82 |
GOST 977-88 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Fe |
| GOST 977-88 |
0.1-0.15 |
≤0.02 |
≤0.02 |
3-3.5 |
7-7.5 |
0.8-1.2 |
Rest |
Fe is the basis.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
| Normalization at 940-960 °C + vacation at 650-720 °C, air cooling + tempering with 880-900 °C + vacation at 200-250 °C air cooling |
| 100 |
≥1079 |
≥1324 |
≥9 |
≥40 |
≥589 |
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 |
