Designation
| Name |
The value |
| Designation GOST Cyrillic |
38НКД |
| Designation GOST Latin |
38HKD |
| Transliteration |
38NKD |
| By chemical elements |
38NiCoД |
| Name |
The value |
| Designation GOST Cyrillic |
38НКД-ВИ |
| Designation GOST Latin |
38HKD-BI |
| Transliteration |
38NKD-VI |
| By chemical elements |
38NiCoД-ВIr |
Description
Alloy 38NKD used: for the manufacture of vacuum-tight junctions with glass marks P-6, С72−4 and sapphire.
Note
Alloy with an average value of CTE.
Alloy with a CTE (7,0−7,8)·10-6 deg-1 in the temperature range from minus 60 to plus 400 °C.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and General rules |
В30 |
GOST 10994-74 |
| Tape |
В34 |
GOST 14080-78 |
| Wire, steel, alloy |
В73 |
GOST 14081-78, TU 14-1-3177-81 |
| Bars and shapes |
В32 |
GOST 14082-78, TU 14-11-245-88 |
| Blanks. Of the workpiece. Slabs |
В31 |
TU 14-1-3904-84 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Ni |
Fe |
Cu |
Co |
| GOST 10994-74 |
≤0.05 |
≤0.015 |
≤0.015 |
≤0.4 |
≤0.3 |
37.5-38.5 |
Rest |
4.5-5.5 |
4.5-5.5 |
Fe is the basis.
Physical characteristics
| Temperature |
r, kg/m3 |
a, 10-6 1/°C |
| 20 |
8200 |
- |
| -100 |
- |
84 |
| -80 |
- |
84 |
| -60 |
- |
84 |
| -40 |
- |
84 |
| -20 |
- |
85 |
| 100 |
- |
86 |
| 200 |
- |
81 |
| 300 |
- |
79 |
| 400 |
- |
78 |
| 500 |
- |
88 |
| 600 |
- |
101 |
| 700 |
- |
115 |
| 800 |
- |
120 |
A description of the physical symbols
| Name |
Description |
| r |
Density |
| a |
The coefficient of linear expansion |
Technological properties
| Name |
The value |
| The temperature of the inflection point |
≥390 °C |
