Cov Kauj Ruam Ntau Lawm Ntawm Galvanized Steel Pipes

Cov txheej txheem ntws yog raws li nram no: cov yeeb nkab dub - alkaline ntxuav - dej ntxuav - acid ntxuav - yaug nrog dej - soaking tus neeg sawv cev - ziab - kub-dip galvanizing - sab nraud tshuab - sab hauv tshuab - cua txias - dej txias - passivation - dej yaug - kev soj ntsuam - hnyav - khaws cia.