BS IEC 60404-1: 2000 pdf download-Magnetic materials Ð Part 1: Classification.
2.2.1.3 Main applications The materials are used for large d.c. magnets where no mechanical strength is required, for example deflection magnets in elementary particle physics and for relay applications. 2.2.2 Class B.2 – Flat material 2.2.2.1 General These materials are covered by IEC 60404-8-3, IEC 60404-8-4 and IEC 60404-8-10. 2.2.2.1.1 Chemical composition The basic constituent of these materials is iron containing unavoidable impurities, together with a low level of other elements which may arise from additions necessitated during the manufacturing process. The amount of alloying elements is limited to that of non-alloy steel as defined in ISO 4948-1, in particular silicon is less than 0,5 %. These materials can have an annealing treatment after punching to enhance their magnetic properties. 2.2.2.1.2 Basis of subclassification The recommended subclassification is based either on the specific total loss which is a function of thickness and is normally measured at a magnetic polarization value of 1,5 T and at normal industrial power frequencies or (for relay application) on the coercivity.
2.3.2.1.3 Main application These materials are used mainly in the magnetic circuits of electrical apparatus, particularly in the parts of rotating machines in which the flux is not unidirectional. They may also be used in electromagnetic relays, small transformers, chokes for fluorescent tubes, electrical meters, shielding and magnetic poles of electron and proton synchrotrons. 2.3.2.2 Class C.22 – Anisotropic* (oriented) steels for use at power frequencies 2.3.2.2.1 General These materials are covered by IEC 60404-8-7. 2.3.2.2.1.1 Chemical composition The basic constituent of these materials is iron and the main alloying element is silicon (approximately 3 %), together with unavoidable impurities and low levels of other elements which may arise from additions necessitated during the manufacturing process. This type of magnetic material possesses anisotropic properties (orientation) such that the direction parallel to the axis of rolling shows the lowest values of specific total losses and the highest permeability. These properties are sensitive to mechanical treatment, and stress relief annealing may be used to optimize the inherent properties.