This standard applies to magnetic steel strip and sheet supplied in the final annealed condition in coils and intended for the construction of magnetic circuits used at frequencies equal to or greater than 100 Hz.
For the purposes of this standard, the terms and definitions given in IEC 60050-121 and IEC 60050-221, as well as the following definitions, apply:
Classes within this standard are classified according to the maximum value of specific total loss in watts per kilogram and the nominal thickness of the material:
For the material to conform to the requirements of this standard, the buyer must include the following information in his request or order:
A number of options are listed in this standard. If the buyer does not indicate a desire to apply one of these options, products must be supplied in accordance with the essential specification of this standard:
The production process and composition of the steel are left to the discretion of the producer.
The material is supplied in coils. The coil mass must be agreed upon at the time of ordering. The recommended internal diameter of the coils is approximately 400 mm, excluding unoriented strips in thicknesses of 0,20 mm, 0,25 mm, 0,27 mm, 0,30 mm, and 0,35 mm, and grain-oriented strips in thicknesses of 0,18 mm, which have a recommended internal diameter of approximately 500 mm. The strip should be of a uniform width and should be wound so that the edges overlap regularly and the side surfaces of the coil are essentially flat. The coils should be wound tightly enough to prevent collapse under their own weight. The strip may occasionally show welds or interlocks resulting from the removal of faulty areas, subject to prior agreement between the parties. The value of the additional thickness caused by welding is subject to agreement. Marking of welds or interlocks, if necessary, may be the subject of a special agreement. For coils containing repair welds or interlayers, each section of the strip should be of the same quality material. The edges of the welded sections should not be so misaligned as to interfere with further processing of the material.
According to this standard, products are delivered with coating on one or both sides, but are also available without. Other types of coating are available.
Surfaces must be smooth, clean, and free of grease and rust. Scattered defects such as scratches, blisters, and cracks are permissible if the product is within tolerances and if these defects do not impair the proper use of the supplied material. Any insulating coating on the surface of the material must be sufficiently tacky to prevent separation during heat treatment or cutting operations under the conditions specified by the supplier. If the product is to be immersed in a liquid or an additional coating or impregnation is to be applied, an agreement initiated by the buyer must be made with the supplier to ensure compatibility with the surface insulating coating.
The material must be able to be cut at any point and in any shape, ensuring precision work with the right cutting tools.
In short, EN 10303 specifies the technical delivery conditions for cold-rolled unalloyed and alloyed steel strip and sheet with magnetic properties, specifically designed for use at medium frequencies in electromagnetic applications. These materials are essential for the production of electric motors, transformers, and other electromechanical devices operating in the medium frequency range.
This standard applies to:
This standard does not cover electrical steels with or without grain orientation for power frequencies. These are covered by EN 10106 or EN 10107.
The EN 10303 standard provides requirements regarding:
Typical applications of steels conforming to this standard are:
This standard is considered important for the following reasons:
The use of materials complying with EN 10303 is critical for:
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