Bulldozer hniav cua sov rauv qaib ntxhw Excavator sprocket Bulldozer hniav yog ua tiav nrog boron steel lossis carbon steel, thiab ua tiav los ntawm kev kho cua sov txheej txheem xws li quenching thiab tempering, kom lawv tau txais kev ua tau zoo, hardness thiab compressive zog, uas tuaj yeem ua tau raws li kev siv. .
Nyeem ntxiv