Designation
| Name |
The value |
| Designation GOST Cyrillic |
80Г20Ф2Ю |
| Designation GOST Latin |
80G20F2Ju |
| Transliteration |
80G20F2Yu |
| By chemical elements |
80Mn20V2Al |
| Name |
The value |
| Designation GOST Cyrillic |
Ф2 |
| Designation GOST Latin |
F2 |
| Transliteration |
F2 |
| By chemical elements |
V2 |
Description
80Г20Ф2Ю steel is used: for the manufacture of long products and forgings; hull structures of ships, vessels and goods marine equipment (shafts, spindles, axles, worm and gear wheels of low-speed mechanisms, hubs, couplings, power studs, springs, Cams, fingers, parts of friction units of hydraulic motors).
Note
Low dispersion-hardening austenitic steel.
Not prezentacia steel for use in aggressive environments, including sea water.
High static strength is provided by heat treatment due to the dispersion hardening — selection of dispersed carbides of vanadium. Due to the high content of carbon and vanadium steel has a low tendency to grain growth during heating and allows for the forging of fine structure required for a quality nitriding products.
Magnetic permeability μ ≤ 1,01 GS/e and is almost constant in any thermal and thermomechanical processing. Nitriding can increase the permeability of up to 1.2 GS/E.
Standards
| Name |
Code |
Standards |
| Castings, non-ferrous metals and alloys |
В84 |
RD 9257-76 |
| Bars and shapes |
В32 |
TU 14-1-1773-76 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Fe |
Al |
V |
| TU 14-1-1773-76 |
0.7-0.8 |
≤0.03 |
≤0.04 |
18-20 |
≤1 |
Rest |
2.5-3.5 |
1.9-2.3 |
| RD 9257-76 |
0.7-0.8 |
≤0.03 |
≤0.04 |
18-20 |
≤1 |
Rest |
2.5-3.5 |
1.9-2.3 |
Fe is the basis.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
| Forged round and square. Quenching in water from 1150 °C + Vacation at 620 °C, air cooling |
| 100-180 |
≥785 |
≥932 |
≥10 |
≥15 |
| Long products hot-rolled steel. Without heat treatment |
| 30-70 |
≥785 |
≥932 |
≥10 |
≥15 |
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 |
Physical characteristics
| Temperature |
Е, HPa |
r, kg/m3 |
l, W/(m · °C) |
R, Mr. · m |
a, 10-6 1/°C |
С, J/(kg · °C) |
| 20 |
1746 |
7450 |
- |
1060 |
- |
- |
| 100 |
- |
- |
1382 |
- |
1590 |
5443 |
| 200 |
- |
- |
1549 |
- |
1690 |
- |
| 300 |
- |
- |
1717 |
- |
1850 |
- |
| 400 |
- |
- |
1926 |
- |
1900 |
- |
| 500 |
- |
- |
2093 |
- |
2020 |
- |
| 600 |
- |
- |
2261 |
- |
2080 |
- |
| 700 |
- |
- |
- |
- |
2150 |
- |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Weldability |
steel is not welded. |
| The temperature of forging |
In the manufacture of forged pieces of complex configuration - deformation is produced in small compressions at a temperature not below 950 °C, no limit on the number of intermediate heatings (offsets). |
| Machinability |
The machinability of steel 80Г20Ф2Ю is slightly lower than the steel 40Г18Ю3Ф (Ю3Ф) - cutting, milling, and drilling is performed with lower speed and lower flow. |
