Alloy 34НКД
Designation
| Name |
The value |
| Designation GOST Cyrillic |
34НКД |
| Designation GOST Latin |
34HKD |
| Transliteration |
34NKD |
| The chemical elements |
34NiCoД |
Description
Alloy 34НКД applies: for proizvodstva bars hot rolled and forged, forgings used for the manufacture of parts of instruments high precision, low CTE, requiring constancy of size and operating in the temperature range from minus 196 °C to plus 100 °C.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В32 |
TU 14-1-5029-91 |
| Metal forming. Forgings |
В03 |
TU 14-1-5048-91 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Ni |
Fe |
Cu |
B |
Ti |
Co |
| TU 14-1-5029-91 |
≤0.03 |
≤0.01 |
≤0.01 |
≤0.1 |
≤0.1 |
34-35 |
The rest |
0.2-0.4 |
≤0.008 |
≤0.1 |
1.5-2 |
Fe is the basis.
According to TU 14-1-5029-91 the chemical composition is given for the alloy 34KKD-VI. Titanium and boron are introduced by calculation and chemical analysis are not determined, but the calculated data are recorded in the quality document. Deviations from the mass fraction of nickel minus 0,50% are allowed.
Physical characteristics
| Temperature |
a, 10-6 1/°С |
| 100 |
≤10 |
A description of the physical symbols
| Name |
Description |
| a |
The coefficient of linear expansion |
Technological properties
| Name |
The value |
| Microstructure |
The presence of a martensitic transformation when cooled to a temperature of minus 196 °C (frost) are not allowed. |
| Features of heat treatment |
Bars hot rolled and forged on the other 14-1-5029-91 are supplied without heat treatment. CTE is determined on samples annealed by mode: Quenching in water from 830-850 °C + Vacation at 290-310 °C (aging for 1 h) arbitrary cooling - with furnace or container. |
