Designation
| Name |
The value |
| Designation GOST Cyrillic |
03Н18К9М5ТЮ |
| Designation GOST Latin |
03H18K9M5TJu |
| Transliteration |
03N18K9M5TYu |
| By chemical elements |
03Н18Co9Mo5TiAl |
| Name |
The value |
| Designation GOST Cyrillic |
ЧС4 |
| Designation GOST Latin |
ChC4 |
| Transliteration |
ChS4 |
| By chemical elements |
ZrС4 |
Description
03Н18К9М5ТЮ steel is used: for the production of bodies of rocket motors, artillery guns and small guns, hulls of submarines, submersibles, high-load disc turbines, gear wheels, spindles, worms, etc.
Note
Maraging steel with higher structural stability in the temperature range from cryogenic to +500 °C.
Standards
| Name |
Code |
Standards |
| Blanks. Of the workpiece. Slabs |
В31 |
TU 14-1-1214-75, TU 14-1-4203-86 |
| Sheets and strips |
В33 |
TU 14-1-1771-75, TU 14-1-4805-90 |
| Bars and shapes |
В32 |
TU 14-1-811-73 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Ni |
Fe |
Al |
B |
Ti |
Mo |
Zr |
Co |
| TU 14-1-4805-90 |
≤0.03 |
≤0.01 |
≤0.01 |
≤0.1 |
≤0.1 |
17.5-19 |
Rest |
0.05-0.15 |
≤0.003 |
0.65-0.9 |
4.8-5.2 |
≤0.02 |
8-9 |
Fe is the basis.
According to TU 14-1-4805-90 the chemical composition is given for steel grades 03N18K9M5TYU-VI (ChS4-VI), 03N18K9M5TYU-ID (CS4-ID). Boron and zirconium are introduced by calculation and chemical analysis are not determined.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
| Steel cold-rolled sheet 3.5 mm on the other 14-1-4805-90. Without heat treatment - as supplied |
| 3.5 |
- |
≥1320 |
≥6 |
- |
- |
| Steel cold-rolled sheet 3.5 mm on the other 14-1-4805-90. Annealing in air 810-830 °C (aging of 0.5-1.0 h), air cooling + Ageing at 480-500 °C (extract 3 hours), air cooling |
| 3.5 |
≥1815 |
≥1910 |
≥5 |
- |
- |
| Bars hot rolled and forged on the other 14-1-811-73. Hardening in air, 810-830 °C (aging 1 HR) + Aging at 470-490 °C (extract 3 hours), air cooling |
|
≥1815 |
≥1910 |
≥7 |
≥40 |
≥340 |
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 |
