Steel 40Г18Ю3Ф (Ю3Ф)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
40Г18Ю3Ф |
| Designation GOST Latin |
40G18Ju3F |
| Transliteration |
40G18Yu3F |
| The chemical elements |
40Mn18Al3V |
| Name |
The value |
| Designation GOST Cyrillic |
Ю3Ф |
| Designation GOST Latin |
Ju3F |
| Transliteration |
Yu3F |
| The chemical elements |
Al3V |
Description
40Г18Ю3Ф steel is used: for the manufacture of long products and forgings; hull structures of ships, vessels and goods marine equipment with static and cyclic loads without friction (shafts, spindles, axles, worm and gear wheels of low-speed mechanisms, hubs, couplings, power studs, springs, Cams, fingers, parts of motors).
Note
Low austenitic steel.
Steel is not intended for use in aggressive environments.
Steel dispersion-hardened state has a low frictional properties and wear resistance and friction is not applied.
Magnetic permeability μ ≤ 1,01 GS/e and is almost constant in any thermal and thermomechanical processing.
High strength steel is provided by heat treatment due to the dispersion hardening — selection of dispersed carbides of vanadium.
Standards
| Name |
Code |
Standards |
| Castings from non-ferrous metals and alloys |
В84 |
RD 9257-76 |
| Sectional and shaped rolling |
В32 |
TU 14-1-1773-76 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Al |
V |
| TU 14-1-1773-76 |
0.35-0.45 |
≤0.03 |
≤0.04 |
17.5-19.5 |
≤0.5 |
≤0.6 |
≤0.5 |
The rest |
2.6-3.5 |
1-1.3 |
| RD 9257-76 |
0.35-0.45 |
≤0.03 |
≤0.04 |
17.5-19.5 |
≤0.5 |
≤0.6 |
≤0.5 |
The rest |
2.6-3.5 |
1-1.3 |
Fe is the basis.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
| Forged round and square. Quenching in water from 1120 °C to + Vacation at 675 °C, air cooling |
| 100-180 |
≥687 |
≥834 |
≥10 |
≥15 |
| Long products hot-rolled steel. Without heat treatment |
| 30-70 |
≥687 |
≥834 |
≥10 |
≥15 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| 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 |
Physical characteristics
| Temperature |
Е, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
a, 10-6 1/°С |
С, Дж/(кг · °С) |
| 20 |
1716 |
7550 |
- |
950 |
- |
- |
| 200 |
- |
- |
1633 |
- |
1840 |
- |
| 300 |
- |
- |
1842 |
- |
1940 |
- |
| 400 |
- |
- |
2051 |
- |
2030 |
- |
| 500 |
- |
- |
2261 |
- |
2120 |
- |
| 600 |
- |
- |
2470 |
- |
2150 |
- |
| 100 |
- |
- |
- |
- |
1700 |
5443 |
| 700 |
- |
- |
- |
- |
2200 |
- |
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. |
| Workability by cutting |
The complexity of drilling, and turning of steel Ю3Ф in the initial state without heat treatment at 50% less than steel Ю45Г17Ю3 (Yu3), and in face milling for 20% less. The machinability of the steel after heat treatment 15% lower than that of steel 45Г17Ю3 (Yu3). |
