Steel 03Х9К14Н6М3Д (ЭП921; 03Х9К14Н6М3ДФ)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
03Х9К14Н6М3Д |
| Designation GOST Latin |
03X9K14H6M3D |
| Transliteration |
03H9K14N6M3D |
| The chemical elements |
03Cr9Co14Н6Mo3Cu |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП921 |
| Designation GOST Latin |
EP921 |
| Transliteration |
EhP921 |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
03Х9К14Н6М3ДФ |
| Designation GOST Latin |
03X9K14H6M3DF |
| Transliteration |
03H9K14N6M3DF |
| The chemical elements |
03Cr9Co14Н6Mo3CuV |
Description
03Х9К14Н6М3Д steel is used: for the manufacture of highly loaded parts operating at temperatures from +400 °C to -196 °C in a slightly aggressive media; the various parts of the cryogenic equipment; valves of valve nodes oxygen.
Note
High-strength corrosion-resistant Maraging steel alloy with cobalt.
Standards
| Name |
Code |
Standards |
| Sheets and stripes |
В33 |
TU 14-1-2071-77 |
| Sectional and shaped rolling |
В32 |
TU 14-1-3049-80, TU 14-1-1785-76 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Mo |
Co |
| TU 14-1-1785-76 |
≤0.03 |
≤0.01 |
≤0.01 |
0.2-0.6 |
8.5-9.5 |
≤0.1 |
6-7 |
The rest |
1-1.5 |
0.05-0.25 |
3-4 |
13-14 |
Fe is the basis.
According to TU 14-1-3049-80, TU 14-1-1785-76 the chemical composition is given for steel grades 03Kh9K14N6M3D-VD and 03Kh9K14N6M3D-Sh.
When steel 03X9K14N6M3D is added to the steel as additional alloying element up to 1.5% vanadium (V), the steel has the marking 03Х9К14Н6М3ДФ.
Mechanical characteristics
| sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
HRC |
| Bars hot rolled and forged in the delivery condition on the other 14-1-1785-76 (longitudinal samples) |
| ≥1175 |
≥1270 |
≥10 |
≥55 |
≥294 |
≥40 |
| ≥980 |
≥1080 |
≥10 |
≥55 |
≥490 |
- |
Description mechanical marks
| Name |
Description |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Technological properties
| Name |
The value |
| Weldability |
Welded by manual and automatic organomegaly welding. Welded connections are not prone to hot and cold cracks. |
| Microstructure |
The content of residual austenite in the microstructure of 20-25%. |
| Corrosion resistance |
Steel has a high erosion resistance. |
