Electromagnetic steel sheet having an electrically insulating co

Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Weight per unit area specified

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428403, 428407, 428418, 428460, 428461, 428500, B32B 1508, B32B 2738, B32B 2700

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056247494

ABSTRACT:
An electromagnetic steel sheet has an electrically insulating coating with superior weldability, formed by coating a treatment solution on the electromagnetic steel sheet and baking the same, the treatment solution containing a synthetic resin fine-particle emulsion having resistance against chromic and/or bichromic acid and exhibiting a peak temperature not lower than 400.degree. C. at which a weight change rate is maximized when a sample is heated at a constant rate in differential thermal gravimetry, a chromate and/or bichromate base aqueous solution containing at least one kind of two-valence metal, and an organic reducer. The steel sheet is superior in electrical insulation, adhesion, punching ability, weldability and corrosion resistance.

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