Designation
| Name |
The value |
| Designation GOST Cyrillic |
30Х3МА |
| Designation GOST Latin |
30X3MA |
| Transliteration |
30H3MA |
| By chemical elements |
30Cr3Mo |
Description
30Х3МА steel is used: for the manufacture of load-bearing parts of rocket engines, including nitride, operating at temperatures up to 400−500 °C; tubular billets for the manufacture of pipes in chemical and energy engineering.
Note
Alloy structural steel high quality. Nitriding of steel is carried out at a temperature of 500−525 °C.
Standards
| Name |
Code |
Standards |
| Processing of metals by pressure. Forgings |
В03 |
TU 108-11-432-79 |
| Bars and shapes |
В32 |
TU 14-1-950-74 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| TU 14-1-950-74 |
0.27-0.35 |
≤0.025 |
≤0.025 |
0.3-0.6 |
2.9-3.2 |
0.17-0.37 |
≤0.5 |
Rest |
≤0.25 |
≤0.05 |
≤0.03 |
0.25-0.35 |
≤0.2 |
Fe is the basis.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
HB, MPa |
| Bars and strip hot rolled and forged. Quenching in oil or warm water with 870-890 °C + vacation at 580-620 °C, air cooling |
| 25 |
834 |
981 |
15 |
50 |
980 |
302-341 |
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 |
