Alloy 32NKD (ЭИ630А)

Designation

Name The value
Designation GOST Cyrillic 32НКД
Designation GOST Latin 32HKD
Transliteration 32NKD
By chemical elements 32NiCoД
Name The value
Designation GOST Cyrillic ЭИ630А
Designation GOST Latin EI630A
Transliteration EhI630A
By chemical elements -

Description

Alloy 32NKD used: for the manufacture of parts of instruments of very high precision, requiring constant size in the range of climatic temperatures.

Note

The alloy with the lowest CTE.
Alloy in the tempered condition, with a minimum CTE of 1.0·10-6 deg-1 in the temperature range from minus 60 to plus 100 °C.

Standards

Name Code Standards
Classification, nomenclature and General rules В30 GOST 10994-74
Tape В34 GOST 14080-78
Bars and shapes В32 GOST 14082-78, TU 14-1-3264-81, TU 14-11-245-88

Chemical composition

Standard C S P Mn Si Ni Fe Cu Co
GOST 10994-74 0.05 ≤0.015 ≤0.015 ≤0.4 ≤0.2 31.5-33 Rest 0.6-0.8 3.2-4.2
Fe is the basis.

Physical characteristics

Temperature r, kg/m3 a, 10-6 1/°C
20 8200 -
-60 - 2
100 - 7
200 - 21
300 - 54

A description of the physical symbols

Name Description
r Density
a The coefficient of linear expansion