Cov hniav ntawm cov excavator
HCMP foundry yuav cam khwb cia siab manganese steel hniav ntawm excavator thiab shovels.
Manganese hlau: ASTM128 Qib E1 (Mn13Mo1) ... thiab lwm yam, peb tuaj yeem pov raws li cov neeg siv khoom nug cov ntaub ntawv.
Peb cov khoom yuav tsum tau ua kom lub neej hnav siab tshaj plaws.
