Alloy 29NK (29NK-VI)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
29НК |
| Designation GOST Latin |
29HK |
| Transliteration |
29NK |
| The chemical elements |
29Ni |
| Name |
The value |
| Designation GOST Cyrillic |
29НК-ВИ |
| Designation GOST Latin |
29HK-BI |
| Transliteration |
29NK-VI |
| The chemical elements |
29NiCo-ВIr |
Description
Alloy 29NK used: for the manufacture of vacuum-tight junctions of items of electronic equipment with glass С49−1, C52−1, C48−1, С47−1.
Note
Alloy with a low CTE value.
Alloy with a CTE (4.5 to 6.5)·10-6 deg-1 in the temperature range from minus 70 to plus 420 °C.
Alloy 29NK-1 and 29NK-VI-1 are narrowed CTE values compared with the alloy 29NK and 29NK-VI.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В30 |
GOST 10994-74 |
| Tapes |
В34 |
GOST 14080-78, TU 14-1-1286-75, TU 14-1-4346-87, TU 14-1-5088-91 |
| Steel alloy wire |
В73 |
GOST 14081-78 |
| Sectional and shaped rolling |
В32 |
GOST 14082-78, TU 14-11-245-88 |
| Bulls. Blanks. Slabs |
В31 |
TU 14-1-2357-78, TU 14-1-2545-78, TU 14-1-3904-84 |
| Pipes steel and connecting parts to them |
В62 |
TU 14-3-972-80 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
Al |
Ti |
Co |
| GOST 10994-74 |
≤0.03 |
≤0.015 |
≤0.015 |
≤0.4 |
≤0.1 |
≤0.3 |
28.5-29.5 |
The rest |
≤0.2 |
≤0.2 |
≤0.1 |
17-18 |
Fe is the basis.
According to GOST 10994-74 in the alloy of 29NK, 29KN-VI, 29KN-1, 29KN-VI-1 grades, the deviation from the mass fraction of cobalt is ± 0.5%. The mass fraction of silicon in the alloy 29KN-VI, 29KN-VI-1 should not be more than 0.28%. For alloys of 29NK, 29NK-VI grades, the sum of impurities (carbon, chromium, copper, titanium, sulfur, phosphorus, manganese, silicon, aluminum) should not exceed 1%.
Mechanical characteristics
| Section, mm |
σB, MPa |
d4 |
| Tape cold-rolled made of alloy 29NK brands; 29NK-VI; 29NK-VI-1; 29NK-1 according to GOST 14080-78 on delivery |
| 0.3-2.5 |
490-610 |
≥23 |
| 0.02-2.5 |
≤930 |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| σB |
Limit short-term strength |
| d4 |
Elongation after rupture |
Physical characteristics
| Temperature |
r, кг/м3 |
a, 10-6 1/°С |
| 20 |
8200 |
- |
| -100 |
- |
76 |
| -80 |
- |
75 |
| -60 |
- |
74 |
| -40 |
- |
74 |
| -20 |
- |
71 |
| 100 |
- |
63 |
| 200 |
- |
59 |
| 300 |
- |
52 |
| 400 |
- |
50 |
| 500 |
- |
64 |
| 600 |
- |
77 |
| 700 |
- |
90 |
| 800 |
- |
98 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| l |
Coefficient of thermal conductivity |
| a |
The coefficient of linear expansion |
Technological properties
| Name |
The value |
| Frost resistance |
Tape x/K alloy 29NK (29NK-VI; 29NK-VI-1) according to GOST 14080-78 and wire cold-drawn according to GOST 14081-78 should be hardy to minus 70 °C. At the customer's request is made with cold resistance to minus 196 °C. |
| Inflection Point Temperature |
≥420 °C |
