PURPOSE: To produce a grain-oriented silicon steel sheet high in magnetic flux density, in the temp. raising stage in decarburizing annealing for a strip having a specified compsn. rolled into a final prduct thickness, by specifying the deheating amt. in the strip in a roll on the heated side.
CONSTITUTION: A strip S having a compsn. contg., by weight, ≤0.10% C, 2.5 to 7.0% Si and ordinary, inhibitor components, and the balance Fe with inevitable impurities and rolled into a final product thickness is heated electrically between two pairs of upper and lower rolls R1 and R2 in the temp. raising stage in decarburizing annealing. At this time, the strip S is cooled at a P point by the roll R2 on the heated side, the deheating amt. in the strip S at the outlet side roll R2 is regulated to ≤200°C, and the strip S is heated and is thereafter subjected to decarburizing and finish annealing. Thus, the grain- oriented silicon steel sheet having good magnetic properties is stably obtd.
UENO SHINJI
FUKAZAWA HARUO
KIRIYAMA TADAO
