Steel 50Г23Х4ФВ7 (48ВННК-2)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
50Г23Х4ФВ7 |
| Designation GOST Latin |
50G23X4FB7 |
| Transliteration |
50G23H4FV7 |
| The chemical elements |
50Mn23Cr4VW7 |
| Name |
The value |
| Designation GOST Cyrillic |
48ВННК-2 |
| Designation GOST Latin |
48BHHK-2 |
| Transliteration |
48VNNK-2 |
| The chemical elements |
48WННCo-2 |
Description
50Г23Х4ФВ7 steel is used: for the manufacture of forged and rolled round and square steel billets of open smelting and electroslag remelting (ESR); hull structures of ships, vessels and goods marine equipment (rotors, casings and other parts gyroscopic devices).
Note
Low high strength austenitic steel.
Magnetic permeability μ ≤ 1,002 GS/E.
Standards
| Name |
Code |
Standards |
| Castings from non-ferrous metals and alloys |
В84 |
RD 9257-76 |
| Sectional and shaped rolling |
В32 |
TU 14-1-214-72 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Fe |
V |
W |
| RD 9257-76 |
0.44-0.52 |
≤0.025 |
≤0.035 |
22-23 |
3-4.5 |
≤0.6 |
The rest |
1.25-1.55 |
6.7-7.5 |
Fe is the basis.
According to RD 9257-76 the chemical composition is given for steel 50Г23Х4ФВ7 and 50Г23Х4ФВ7-Ш.
Mechanical characteristics
| sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
| Steel 50Г23Х4ФВ7-sh. Without heat treatment. Bars hot rolled round 50-70 mm, round and square forged 100-150 mm |
| ≥1080 |
≥1226 |
≥8 |
≥12 |
≥196 |
| Steel 50Г23Х4ФВ7. Without heat treatment. Bars hot rolled round 30-70 mm, 100-150 mm forged round, forged square cross-section of 90-180 mm |
| ≥1080 |
≥1226 |
≥5 |
≥8 |
- |
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 |
Physical characteristics
| Temperature |
Е, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
a, 10-6 1/°С |
| 20 |
181 |
8100 |
- |
- |
| 200 |
- |
- |
1717 |
- |
| 300 |
- |
- |
1926 |
- |
| 400 |
- |
- |
2177 |
- |
| 100 |
- |
- |
- |
1300 |
A description of the physical symbols
| Name |
Description |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
