Steel 50Х4Г18
Designation
| Name |
The value |
| Designation GOST Cyrillic |
50Х4Г18 |
| Designation GOST Latin |
50X4G18 |
| Transliteration |
50H4G18 |
| The chemical elements |
50Cr4Mn18 |
Description
50Х4Г18 steel is used: for the manufacture of retaining rings of turbogenerators and other parts of the engineering requirements of namagnichennosti.
Note
The austenitic steel.
Absolute magnetic permeability at field strength of 1.6·104 A/m (200Э) must not exceed 1.4 x 10-6 Ng/m (1,1 GS/e).
Electrical resistivity shall not be less than 0,65·10-6 Ohm·m (0.65-Ohm·mm2/m).
Standards
| Name |
Code |
Standards |
| Metal forming. Forgings |
В03 |
TU 24.00.3748-85 |
Chemical composition
| Standard |
C |
S |
Mn |
Cr |
Si |
Ni |
Fe |
Cl |
| TU 24.00.3748-85 |
0.4-0.55 |
≤0.025 |
17-19 |
3-4 |
0.2-0.8 |
≤0.5 |
The rest |
≤0.05 |
Fe is the basis.
Mechanical characteristics
| sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
| The workpiece retaining ring - selection of samples for testing wall thickness 58-85 mm (strength category - I to V) |
| 588 |
735 |
25 |
35 |
| 706 |
834 |
22 |
35 |
| 785-834 |
883-932 |
20 |
35 |
| 834-883 |
912-961 |
20 |
35 |
| 863-981 |
912-1040 |
20 |
35 |
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 |
