机械工业部上海材料研究所,研制成一种新型硬质合金——材20。目前已在部分工厂应用,反映良好。材20的特点:红硬性及耐磨性能好,并能承受较大的切削冲击,适用于制作高速切削齿轮刀具。用它制作的m=2～4的齿轮滚刀,在齿轮厂使用时切削速度达到150米/分,赶上了国际先进水平。圆盘齿轮铣刀(机夹式),在X62W铣床上精切m=4,HRC Ministry of Machinery Industry Shanghai Institute of Materials, developed into a new type of cemented carbide - wood 20. Has been applied in some factories, reflecting the good. Material 20 features: red hardness and wear resistance, and can withstand greater cutting impact, suitable for making high-speed cutting gear cutter. With its production of m = 2 ~ 4 gear hobs, cutting gear factory in the use of cutting speed reached 150 m / min, to catch up with the international advanced level. Disc gear cutter (clip-on), in the X62W milling fine cut m = 4, HRC