In this work, measurements of longitudinal wave attenuation in austenitic steel welds and in cast austenitic steel samples are presented as function of both ultrasonic frequency and propagation direction. These results are obtained by means of the C-Scan Integration method (CSIM), which experimentally overcomes the need of introducing corrections due to beam diffraction. More importantly, CSIM, by collecting the energy transmitted through the samples over areas larger than the cross-section of the beam, yields results that are not affected by beam steering. The CSIM, therefore, can be used on both isotropic and anisotropic of media. Comparisons between longitudinal wave attenuation measurements in austenitic welds and cast samples by means of conventional immersion techniques and CSIM are also presented.