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High-speed steels have been applied to cutting tools, which are machined from wrought bars. In order to shortcut the time-consuming procedures, the new precision casting technology has been developed to supply Near-Net-Shaped preforms ready to machine into tools.The employed casting technology is the modified lost wax process, where the molten metal is sucked up into the cavity of the shell molds. The superheat of the metal is controlled low enough to reduce the size of primary carbides.The performance of the castings is promising as follows.(1) The hardness is equal to wrought bars after quenched and tempered.(2) The bending strength is lower than wrought bars, but still maintains 80% of transverse values for wrought ones.(3) The wear resistance is better than wrought ones on the disk-on-plate test.(4) The cutters of castings revealed the equivalent tool lives to wrought ones machining case-hardening steel blanks into spiral bevel gears.
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