The thin strip casting of high speed steels W3Mo2Cr4VSi and W6MoSCr4V2 has been investigated. The as-cast strips are of 2.5-4mm thickness, reduced by hot rolling to 1.8-2mm thickness. The steel sheets are used to make power hacksaw blades. The experimental results show that the metallurgical quality of the as-cast strips is now at an acceptable level, and the as-cast carbides in the strips are very free although the eutectic carbide network still exists. However, most of the eutectic carbide network in the strips can be broken up by post-treatment. Cutting test reveals that the performance of these hacksaw blades is satisfactory, compared with that of hacksaw blades made of conventionally produced steel sheets.