Alloy 81NMA

Designation

Name The value
Designation GOST Cyrillic 81НМА
Designation GOST Latin 81HMA
Transliteration 81NMA
By chemical elements 81NiCu

Description

Alloy 81NMA used: for the manufacture of cores of magnetic heads, small transformers, chokes, relays, flaw detectors, magnetic shields, ferroprobes for use in electronic equipment of high sensitivity.

Note

The alloy with the highest value of magnetic permeability in weak permanent and variable magnetic fields with low sensitivity to mechanical stress and increased strength. Depending on the final heat treatment σIn can be from 640 N/mm2 (65 kgf/mm2) to 1270 N/mm2 (130 kgf/mm2).

Standards

Name Code Standards
Classification, nomenclature and General rules В30 GOST 10160-75, GOST 10994-74
Bars and shapes В32 TU 14-11-245-88

Chemical composition

Standard C S P Mn Si Ni Fe Ti Mo
GOST 10994-74 ≤0.01 ≤0.01 ≤0.01 ≤0.35 ≤0.1 80.5-81.7 Rest 2.5-3.3 4.7-5.2
Ni is the basis.