Designation
| Name |
The value |
| Designation GOST Cyrillic |
30ХНМЛ |
| Designation GOST Latin |
30XHML |
| Transliteration |
30HNML |
| By chemical elements |
30CrНMo |
Description
30KHNML steel is used: for the manufacture of castings for critical loaded parts, which are requirements of high strength and sufficient toughness, working under static and dynamic loads at temperatures up to +400 °C.
Standards
| Name |
Code |
Standards |
| Steel castings |
В82 |
GOST 977-88, OST 3-4365-79, TU 108.11.352-87 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Mo |
| GOST 977-88 |
0.25-0.35 |
≤0.04 |
≤0.04 |
0.4-0.9 |
1.3-1.6 |
0.2-0.4 |
1.3-1.6 |
Rest |
0.2-0.3 |
Fe is the basis.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
HB, MPa |
| Hardening in air, 860-870 °C + vacation at 600-650 °C, air cooling |
| 100 |
≥638 |
≥785 |
≥10 |
≥20 |
≥392 |
206-255 |
| Normalization at 860-880 °C + vacation at 600-650 °C, air cooling |
| 100 |
≥540 |
≥687 |
≥12 |
≥20 |
≥294 |
- |
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 |
