The basic raw material used for manufacturing the Core / Lamination is Cold Rolled Grain Oriented Steel (CRGO)
steel. This CRGO steel is imported from reputed overseas mills in various grades of different permeability. Basically,
there are many types of CRGO Steel e.g. M-3, M-4, M-5 and M-6 grade and HI-B Material.
These raw materials are imported in forms of coils having standard width or in form of slits.
CRGO material has the least figure of maximum core loss in the rolling direction. With the increased shearing angle
to the rolling direction, the core loss at any particular flux density goes up and becomes generally highest in the
transverse direction. Because of this it is possible to use CRGO in static electrical machines which include all types of
power transformers, distribution transformers, etc.
Manufacturing Mills of CRGO Steel do guarantee the core loss figure at flux density of 1.5 Tesla for conventional grain
oriented steel and at 1.7 Tesla in case of HI-B and HI-B-LS steel.
The grades of material popularly used are M-3, M-4, M-5 and M-6. We also use, for special requirements of the
customers, HI-B Material designated as MOH, TRAN-COR H, ZH, ZDKH and ZDMH.