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 σ_In 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.