in Dnipro

Mülheim an der Ruhr
Dnieper
Kiev

Alloy 25НЮ

Designation

Name	The value
Designation GOST Cyrillic	25НЮ
Designation GOST Latin	25HJu
Transliteration	25NYu
By chemical elements	25NiAl

Description

Alloy 25НЮ used: for the manufacture of cast (with subsequent grinding) permanent magnets mass production (due to otsutstvie scarce and expensive cobalt).

Standards

Name	Code	Standards
Sheets and strips	В33	TU 14-1-157-72

Chemical composition

Standard	C	Mn	Si	Ni	Fe	Al	Nb
TU 14-1-157-72	≤0.05	≤0.6	≤0.4	24.5-25.5	Rest	8.4-9.6	3.7-4.2

Fe is the basis.

Technological properties

Name	The value
Particularities of production of goods	The main drawbacks of alloy: high hardness, brittleness and poor workability, so the magnets of them have cast manufacturing and processing by grinding. Alloy not processed by cutting, not drilled. Products accurate dimensions, due to brittleness and hardness, allowing processing only by grinding to produce almost impossible. Fine products made by powder metallurgy methods, obtaining sintered magnets by compaction of the powder composed of the crushed particulate alloy, and further sintering at high temperatures by analogy with the processes of ceramics. Pressed parts sintered in a tubular electric furnace at a temperature 1280-1290 °C (delay 2-3 hours), cooled in running water. Sintering is produced in the environment of the reducing gas of hydrogen or dissociated ammonia.