Materials and technical specifications

Working with CRGO and CRNO electrical steel, we support transformer manufacturers with a range of thicknesses, grades and customized component requirements.

Specification

Material	Full name	Thickness	Grades
CRGO	Cold-Rolled Grain-Oriented electrical steel	0.20 mm to 0.35 mm	70 to 120 grade, depending on material specification and availability
CRNO	Cold-Rolled Non-Grain-Oriented electrical steel	0.35 mm and 0.50 mm	230 to 360 grade in 0.35 mm; 350 to 1000 grade in 0.50 mm

Grades depend on material specification and availability.

CRGO

Its grains run along the rolling direction, so flux flows best along the length of the strip. Core corners are mitred at 45° to keep the flux close to the grain at the joints.
Step-lap stacking staggers the joints in small steps, so the flux crosses them gradually. This lowers core loss and transformer noise.
Each sheet carries a thin insulating coating that limits eddy currents. Cutting burrs can bridge that coating, so clean edges matter.

CRNO

Its magnetic properties are the same in every direction, which suits the changing flux path in E&I cores. It is also the standard steel for electric motors for the same reason.
Many standard E&I sizes are scrapless: the I is punched from the window of the E, so very little steel is wasted.
Thinner sheet has lower eddy-current loss, so 0.35 mm loses less energy than 0.50 mm.

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