Designation
| Name |
The value |
| Designation GOST Cyrillic |
40ХМФА |
| Designation GOST Latin |
40XMFA |
| Transliteration |
40HMFA |
| By chemical elements |
40CrMoV |
| Name |
The value |
| Designation GOST Cyrillic |
40ХМФ |
| Designation GOST Latin |
40XMF |
| Transliteration |
40HMF |
| By chemical elements |
40CrMoV |
Description
40KHMFA steel is used: for the manufacture of spline shafts, brushes, rods, fasteners pipelines operating at temperatures up to +400 °C.
Note
Structural steel high quality chrome-molybdenum-vanadium.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В32 |
GOST 4543-71, GOST 14955-77, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-5228-93, TU 14-136-367-2008 |
| Bars and shapes |
В22 |
GOST 8319.0-75 |
| Blanks. Of the workpiece. Slabs |
В31 |
OST 3-1686-90, TU 14-1-4944-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 4543-71 |
0.37-0.44 |
≤0.025 |
≤0.025 |
0.4-0.7 |
0.8-1.1 |
0.17-0.37 |
≤0.3 |
Rest |
≤0.3 |
0.1-0.18 |
≤0.03 |
0.2-0.3 |
≤0.2 |
Fe is the basis.
GOST 4543-71 regulates the content of high-quality steel: P≤0,025%; S≤0.015%; Сu≤0.25%.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
| Rolled steel. Quenching in oil from 860 °C to + Vacation at 580 °C, cooling in oil |
| 25 |
≥930 |
≥1030 |
≥13 |
≥50 |
≥880 |
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 |
| KCU |
Toughness |
