1. High-speed steel In 1898, American engineers FWTaylor and M. White invented high-speed steel. The composition at that time was C0.67%, W18.91%, Cr5.47%, V0.29%, Mn0. .11%, the balance is iron. The processing efficiency of high-speed steel tools is 4 times and 25 times higher than that of carbon tool steel and alloy tool steel. At the beginning of the 20th century, the level of cutting and processing in the United States and the United Kingdom had thus made a leap and gained huge economic benefits. Later, on this basis, the most common general-purpose high-speed steel W18Cr4V was formed, which is still in use today. In order to meet the requirements of hot rolling tools
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