無方向性電磁鋼板の打ち抜き加工性を向上する電気絶縁被膜(電磁鋼板・ステンレス鋼の表面処理)(<特集>鋼材の表面処理)

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In addition to magnetic properties, excellent punchability and TIG weldability are required for nonoriented electrical steel sheets. These properties depend not only on the mechanical properties and chemical composition of steels, but also on the character of insulating coating applied to steel sheets. This report provides an outline of development in Kawasaki Steel Corporation during the last decade in insulating coating improving the punchability and weldability of electrical steel sheets. The first success in improvement of punchability was established by the chromate coating obtained by the solution with the specific composition of Ca/CrO_3=0.195. This coating is significant as the basis of the subsequent development in insulating coatings with respect to punchability. The next developed coating, composed of the chromate-organic resin double layered film, had better punchability as compared with other insulating coatings at that time. This coating, however, had poor TIG weldability, and further development has been made and succeeded to solve this problem. The chromate-organic resin mixed coatings with smooth surface and with the agglomerated coarse particles in its own film are, in present, applied to electrical steel sheets. These newly developed coatings have both excellent punchability and TIG weldability. The change in structure of the chromate coating and chromate-organic resin mixed coating during baking has also been investigated by means of infrared absorption spectra.
社団法人日本鉄鋼協会の論文
1980-06-01

無方向性電磁鋼板の打ち抜き加工性を向上する電気絶縁被膜(電磁鋼板・ステンレス鋼の表面処理)(<特集>鋼材の表面処理)

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