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The austenitic stainless steel is excellent in corrosion resistance, toughness, and workability. But it is inferior to hardness and wear resistance. However, because it is not possible to stiffen by quenching, the development of the method of improving wear resistance is required. Recently, boriding has attracted extensive attention as surface stiffening processing of plain steel. In this research, the influence of processing temperature on the formation layer of SUS304 steel by B added fused salt bath was examined. Boriding were performed in molten borax which contained 4 massB at processing temperatures of 1123~1223 K (processing time of 1800 s). As a result of the examination, the hardness of the boriding layer becomes about 2000 HV when the processing temperature of 1223 K. Also the wear resistance too has improved remarkably. Furthermore, it was understood that the formation layer on the surface was FeB, and, additionally, consisted of compounds such as Fe, Cr, and B from the Vickers hardness and the analysis of the Xray diffraction measurement.

Influence of Processing Temperature on Boriding of SUS304 Stainless Steel by Al Added Fused Salt Bath