Narrow-format grain-oriented silicon electrical steel (GOES) — under 600 mm wide — is slit or produced to width for use in smaller transformer cores, distribution transformers, and specialty magnetic components. The US schedule provides four 10-digit lines (7226110000 through 7226119060) that distinguish widths between 300–600 mm from those under 300 mm, and further split the narrower band by thickness relative to 0.25 mm — a specification threshold that reflects the ultra-thin lamination grades used in high-efficiency transformer designs. Japan and Germany are the leading suppliers, with Mexico and Canada also significant. Section 232 tariffs apply, and importers should confirm that mill certifications specify both width and thickness to support the correct 10-digit classification.

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