... cuter all use alloy steel . There are CAT series , Komatsu series , H&L series ,Kobelco series and JCB series . Each product all manufacture through investment casting ... ,T3,T4.Machine type:Excavator, Loader,Bulldozer,etc.Brands:Caterpillar, Komatsu, ESCO,JCB,Hyundai,Daewoo,Hitach,etcHeat treatment:Quenching and tempering ...