Relationship between texture and DC magnetic induction after various stages of processing in a 1 pct Si steel
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work has shown that hot-rolling finishing temperatures e x e r t a strong influence on the texture of low carbon steels 1-3 and - 1 pct Si steels 1'4 in the h o t rolled condition. The influence of these hot-rolling text u r e s on subsequent cold-rolling and annealing textures has also been determined. %3,s-7 The relationship between texture, as measured by the full pole figure technique, and magnetic properties has been demonstrated to a very g r e a t extent in grain-oriented 3 pct Si steels. However, no data are available which r e l a t e texture and magnetic properties in nominally nonoriented 1 pct Si steel. The present work was undertaken to investigate the relationship between the p r e f e r r e d orientation produced during hot-rolling, the annealing textures developed a f t e r different d e g r e e s of cold reduction, and the associated dc magnetic induction at 100 oe in a c o m m e r c i a l 1 pct Si steel. MATERIAL AND PROCESSING The m a t e r i a l used in this investigation was a comm e r c i a l 1 pct Si steel containing 0.06 pct C. Detailed chemical analyses are presented in Table I. In o r d e r to evaluate the effect of different hot-rolling textures, two finishing temperatures, namely 1600° and 1450°F, were used. The f o r m e r is known t o produce a near-random orientation, while the l a t t e r will produce a strong [011] partial fiber texture at the mid-thickness2 Two coils were rolled t o a gage of 0.09 in. finishing at 1600°F, while twelve c o i l s were r o l l e d t o various gages between 0.113 and 0.077 in. finishing nominally at 1430° t o 1470°F. Temperature control at the lower finishing temperatures was somewhat e r r a t i c and a finishing
r a n g e of 1400° t o 1500°F was actually recorded. The p u r p o s e of the different finishing gages at the lower finishing temperature was t o allow the effect of different subsequent cold reductions to be studied w i t h a constant finishing gage of the cold-rolled s t r i p . Cold-rolling was c a r r i e d out u n d e r low and high s t r a i n r a t e s . The low strain-rate rolling (~max = 10.4 sec -1) of sheet samples was achieved u s i n g a laboratory Stanat Mill with 18 in. work r o l l s . Unidirectional laboratory rolling of 20, 30, 40, and 50 pct reduction was c a r r i e d out on samples taken from the c o i l s finishing at 1600°F and from two coils finishing at 1450°F with the same gage of 0.09 in. Kerosene was used as a lubricant and no strip tension was applied. High strain-rate coldrolling (Emax = 258 sec -1) was c a r r i e d out on a comm e r c i a l facility on the 10 coils of oriented hot-rolled m a t e r i a l u s i n g c o m m e r c i a l practice t o produce a nominal gage of 0.055 in. This resulted in cold reductions of between 26 and 52 p c t , depending upon the initial hot-band g a g e . The s a m p l e s r o l l e d in the laboratory mill were ann e a l e d in a m a n n e r that simulated the c o m m e r c i a l box anneal, namely, by heating at 50°F per hr t o 1300°F, holding for 24 hr, then cooling a
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