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中国铁道学院戚正风教授发明了一种超硬高速钢,并获得专利权。这种高速钢属无莱氏体高速钢,热处理后的硬度可达67～70HRC。用其制造的刀具寿命为一般通用高速钢的三倍,而
Professor Qi Zhengfeng from China Railway Institute invented a super-hard high-speed steel and obtained the patent right. This high-speed steel is a non-Ledeburite high-speed steel, the hardness after heat treatment up to 67 ~ 70HRC. With its tool life of three times the general-purpose high-speed steel, and