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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

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