... ,T4.Machine type:Excavator, Loader,Bulldozer,etc.Brands:Caterpillar, Komatsu, ESCO,JCB,Hyundai,Daewoo,Hitach,etcHeat treatment:Quenching and tempering treatment ... , X220, X290, X290F, X310, X330, X370, X400, X410, X500, etc Esco: 18S, 22S, 25S, 30S, 35S, 40S, 45S, 21SYL, 27SYL, 37SYL ...