[en] Since stress induces directionally dependent changes in the magnetic properties of steels, there should be a discernable change in behavior of the magnetic properties between a magnetic field applied in a direction coaxial with the stress and a field applied non-coaxial with the direction of applied stress. These changes in magnetic properties could perhaps be used ultimately for nondestructive evaluation of stress magnitude and direction in materials that are in service. This work is intended to advance the understanding and modelling of the angular dependence of magnetic properties under stress. As steel structures in power plants reach the end of their projected life span, the probability of catastrophic failure increases dramatically. To avoid this, there is a need to identify components which are at a risk and replace them. Monitoring of the mechanical stress in component sections is very important. This is particularly true in places where one component is joined to another. It is known that microstructural defects in regions of high stress eventually propagate into cracks, which if further propagated, can become causes of structural failure. The use of magnetic NDE methods to monitor stress would be advantageous because these methods provide measurements of properties which are very sensitive to mechanical stresses. It is well known that the magnetic properties of steels are very strongly affected by mechanical deformation of the material and this has led many experts to suggest that magnetic methods should provide an ideal NDE technique for stress evaluation. A complete development of a predictive model for utilizing the interplay between stress and magnetic properties would be an important step in the development of magnetic NDE methods for measuring stress