Grade: G45 Density: 13.4 Hardness: 84 Uses: Widely mold steel processing special. Tungsten is the final heat treatment temperature quenching and tempering times. W18Cr4V steel quenching temperature up to 1270 ~ 1280 ℃, obtained after quenching martensite, residual austenite and carbides (20% ~ 30%). Tempering times using 560 ℃ tempering, many tempering quenching primary purpose is to eliminate the residual austenite in many, transform it into martensite; three tempered martensite is also precipitated more carbides, resulting in secondary hardening, improve hot hardness.