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Effect of soaking temperature and annealing atmosphere on magnetic properties of semi‐processed nonoriented electrical steel containing 0.4 % silicon
Author(s) -
Park Jong T.,
Woo Jong S.,
Chang Sam K.
Publication year - 1998
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199801344
Subject(s) - annealing (glass) , dew point , materials science , silicon , electrical steel , atmosphere (unit) , analytical chemistry (journal) , metallurgy , composite material , chemistry , physics , chromatography , meteorology , thermodynamics
In order to investigate the effect of soaking temperature and annealing atmosphere on magnetic properties of the semi‐processed nonoriented electrical steel containing 0.4 % silicon, customer annealing was carried out at a temperature ranging from 730 to 950 and in different annealing atmospheres. As the soaking temperature increases from 730 to 950 in the dry N2 atmosphere, the core loss at 1.5 Tesla decreases continuously, whereas the permeability at 1.5 Tesla increases up to 890 and then decreases significantly at 950 °C. Among DX atmospheres having a dew point of ‐23 °C, the air to LPG ratio of 19.5 is found to reveal the best magnetic properties due to the lowest carbon content. At a dew point of +5 °C and an air to LPG ratio of 18.5 the best magnetic properties are to be achieved regarding both carbon content and internal oxidation layer.