Designation
| Name |
The value |
| Designation GOST Cyrillic |
40КНХМВТЮ |
| Designation GOST Latin |
40KHXMBTJu |
| Transliteration |
40KNHMVTYu |
| By chemical elements |
40CoNiCrCuВTeAl |
Description
Alloy 40KNKHMVTJU used: for the manufacture of clockwork springs watches.
Note
Alloy non-magnetic corrosion resistant strain-hardening with the temporary resistance of wire 1960- 2160 MN/m2 (200−220 kg/mm2), with the normal elasticity modulus 216000 MN/m2 (22000 kgf/mm2).
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and General rules |
В30 |
GOST 10994-74 |
| Wire, steel, alloy |
В73 |
GOST 14118-85, TU 14-4-1272-84 |
| Bars and shapes |
В32 |
TU 14-11-245-88 |
| Tape |
В34 |
TU 14-165-306-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Al |
Ti |
Mo |
W |
Co |
| GOST 10994-74 |
≤0.05 |
≤0.02 |
≤0.02 |
1.8-2.2 |
11.5-13 |
≤0.5 |
18-20 |
Rest |
0.2-0.5 |
1.5-2 |
3-4 |
6-7 |
39-41 |
Fe is the basis.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
| Wire of 0.3-5.0 as supplied by GOST 14118-85 |
|
- |
≥1890 |
- |
|
- |
≥1470 |
- |
| Wire. Annealing in air from 1100-1150 °C + Aging at 500-550 °C (exposure 4 h) |
|
1800-2000 |
2000-2200 |
≥5 |
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 |
