AISI 304L stainless steel material was pack-borided with microwave hybrid heating method at temperatures of 850, 900 and 950 °C for 2, 4 and 6 hours. The morphology of the boride layer formed on the surface of the samples was examined by an optical microscope. The X-ray diffraction (XRD) analysis showed the presence of the FeB, Fe2B, Cr2B and Ni2B phases on the surface of the borided samples. The Daimler-Benz Rockwell-C adhesion test was carried out to evaluate the adhesive strength of the boride layer to the substrate material. The tests were repeated at least 3 times for each of the samples packborided at all process temperatures and times. After the adhesion tests, macro and SEM images of indentation traces were taken. By analysing the indentation craters, it has been determined whether the damages are acceptable or not with reference to the VDI 3198 standard. The indentation craters formed on the surfaces of the samples were pack-borided at 850 °C for all process times, at 900 °C for 2 and 4 hours, and at 950 °C for 2 hours have the best adhesion quality in the HF1 category of the VDI 3198 norm. The pack-boriding treatment with microwave hybrid heating contributed positively to the adhesion strength, but in additions to this, the test results revealed that adhesion decreased with increasing boriding temperature and time.