Cold-drawing general considerations

Austenitic stainless steels are generally considered non-magnetic, although the magnetic permeabiUty can increase due to cold drawing of the steel. This property can be useful for specific applications [6,7] it should also be taken into consideration when conventional magnetic covermeters are used, since they fail to detect the rebars. 

For polymers, the situation is clearly more complicated than that for the brittle-ductile transition in metals, as there are in general four regions of behaviour and not two. It is of considerable value to discuss the factors that influence the brittle-ductile transition, and then to consider further factors that are involved in the observation of necking and cold-drawing. 

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