Zund hniav Z31 yog ua los ntawm ultra-fine tungsten steel hmoov. Tungsten steel (hard alloy) muaj cov khoom zoo heev xws li siab hardness, hnav tsis kam, lub zog thiab toughness, kub tsis kam thiab corrosion kuj, tshwj xeeb tshaj yog nws cov hardness siab thiab hnav tsis kam. Carbide yog dav siv los ua cov ntaub ntawv, xws li cov cuab yeej tig, milling cutters, planers, drills, tho txawv cov cuab yeej, thiab lwm yam., Kev txiav ceev ntawm cov cemented carbides tshiab yog tam sim no ob peb puas npaug ntawm carbon steel.