熱延用高V粉末ハイスロールDXHの特性

概要

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A high speed steel roll has been made using carbide controlling technology during the HIP consolidation of high vanadium high speed steel powder (DXH). The basic characteristics, roll life and other rolled product qualities were examined. The results are summarized as follows:1) The carbide size became bigger according to the increase of HIP temperature. The carbide remained spherical and homogeneous in distribution.2) The wear resistance was improved by increasing carbide size. The wear resistance of DXH was excellent as the result of an adequate amount of hard vanadium carbide.3) In comparison with high Weq(=2Mo+W) high speed steel made by the same HIP process, DXH showed better wear resistance, better bending strength and better heat shock resistance.4) As for conventional roll materials, bending strength of ductile cast and heat shock resistance of cemented carbide were much lower than those of DXH.5) The boundary between DXH and SCM, which were used for roll shaft, was so strong that fractures after mechanical tests occurred avoiding this boundary.6) Excellent wear resistance of DXH resulted in the reduction of roll consumption and improvements in the surface quality of rolled products.