Nickel-cobalt alloy 29NK (29NK-VI, 29NK-VI-1, 29NK-1, Kovar)
Designed for vacuum junctions of elements of electronic equipment with glasses C49−1, C52−1, C48−1, C47−1; TKLR * 1,000,000 in the temperature range from -70 to +420 ºC no more than 4.5−6.5 [1 / ºC]
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Precision alloys |
With given TCLE |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Co, % |
Cr, % |
Ti, % |
Cu, % |
Ni, % |
Al, % |
P, % |
C, % |
S, % |
|---|
| GOST 10994-74 |
51.14–54.5 |
< 0.3 |
< 0.4 |
17–18 |
< 0.1 |
< 0.1 |
< 0.2 |
28.5–29.5 |
< 0.2 |
< 0.015 |
< 0.03 |
< 0.015 |
Information on suppliers
Physical characteristics
| Temperature, °C |
$$E\cdot 10^{9}$$, $$MPa$$ |
$$\rho$$, $$\frac{kg}{m^3}$$ |
$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$ |
|---|
| 20 |
145 |
8200 |
0.5 |
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
$$\epsilon_L$$, % |
Treatment |
|---|
| Tape |
|
|
|
|
490–610 |
23 |
|
Magnetic properties
| Rolling |
$$H_c$$, $$A/m$$ |
$$\mu_{max}$$, $$MH/m$$ |
$$B_{1000}$$, $$T$$ |
|---|
| Tape |
74 |
< 6.36 |
0.98–1.32 |
Твёрдость по Викерсу
| Rolling |
Standard |
Classifiers |
Value, HV |
| Tape |
GOST 10994-74 |
|
150–160 |
Casting and technological parameters
Technological Properties
| Weldability |
Flake Susceptibility |
Propensity to temper brittleness |
|---|
| no limits |
not sensitive |
not inclined |
Analogues
| Germany |
USA |
|---|
| Сплавы NiCo 29 18 и 1.3981 |
Сплавы 7726, 7727, 7728, K94610 |
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Co |
% |
Cobalt |
| Cr |
% |
Chrome |
| Ti |
% |
Titan |
| Cu |
% |
Copper |
| Ni |
% |
Nickel |
| Al |
% |
Aluminium |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
Description of physical characteristics
| Parameter |
Units of measurement |
Description |
| $$E\cdot 10^{9}$$ |
$$MPa$$ |
Elastic modulus |
| $$\rho$$ |
$$\frac{kg}{m^3}$$ |
The density of the material |
| $$R\cdot 10^{-6}$$ |
$$\Omega\cdot m$$ |
Electrical resistivity |
Description of mechanical properties
| Parameter |
Units of measurement |
Description |
| $$\sigma _{U}$$ |
$$MPa$$ |
Ultimate tensile strength |
| $$\epsilon_L$$ |
% |
Elongation at break (longitudinal) |
Description of magnetic properties
| Parameter |
Units of measurement |
Description |
| $$H_c$$ |
$$A/m$$ |
Magnetic coercivity (not more) |
| $$\mu_{max}$$ |
$$MH/m$$ |
Magnetic permeability (not more) |
| $$B_{1000}$$ |
$$T$$ |
Magnetic induction (not less) in a magnetic field while magnetic field strength is 1000 A/m |
Description of the casting and technological parameters
| Parameter |
Units of measurement |
Description |
| melting point |
°C |
The temperature at which solid crystalline body makes the transition to the liquid state and Vice versa |
Designation of types of weldability
| Parameter |
Units of measurement |
Description |
| no limits |
|
Welding is performed without heating and without subsequent heat treatment |
| Boundedly welded |
|
Welding is possible with heating up to 100–120 °C and subsequent heat treatment |
| Difficult to weld |
|
For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing |
| Not applicable for welded structures |
|
|