Since Kawasaki Steel had begun to manufacture a grain oriented electrical steel sheet "RG" in 1961, it was always seeking after a low iron loss technology to have successfully made the commercialization of "thin gage (RGH" (0.23 mm, 0.20 mm in thickness) having high magnetic flux density and low iron loss, in 1981. Then, Kawasaki Steel has developed "RGH PJ" by using Plasma jet and "RGH PD" of fine grooving to reduce Iron loss, both of which materials obtain a high evalua- Tion as core materials for low iron loss transformers. Recently a heat-resistant domain-controlled new product "New RGH PD" exhibiting low iron loss has been com- mercialized by using a highly grain oriented electrical steel through the improvement of inhibitors RGH.
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