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U14164 
E Allegheny Ludlum Steel Corp. 
SOFT MAGNETIC MATERIALS, by J. P. Martin. 
Quarterly progress rept. no. 6, June 1-Aug. 31, 1950. 
Sept. 15, 1950, 18p. illus. diagrs. |. UNCLASSIFIED 
Core loss data from 60 to 2400 c. and a.c. permea- 
bility at 60 c. for oriented Si steel strip 0.002 and 
0.005 in. thick produced by Littman's technique (U.S. 
2,473,158), and d.c. hysteresis and permeability 
curves for wound cores of each thickness are pre- 
sented. Strip cold-rolled from a commercial heat 
of Va Permendur containing residual Al and from a 
laboratory heat gave quite different results when re- 
crystallized in a magnetic field, X-ray diffraction 
studies of Va Permendur showed random orientation 
of well-developed grains in hot-rolled sheet and 
marked preferred orientation of very fine grains in 
cold-rolled strip. Such materials made from a sin- 
(over) 
  
DOCUMENTATION OF LITERATURE 
| 1. Magnetic materials 
| I. Contract W36-039-sc- 
| 38243 
| NAVY RESEARCH SECTION 
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