Cov txheej txheem kub: tub sab --- --- cua kub --- perforation --- raj dov --- sizing-txias txaj-wires-raj txiav-soj ntsuam-ntim --- nkoj
Cov txheej txheem kos duab txias: raj npliag --- cua sov --- perforation-kub ntxuag (coj khaub ncaws thib ob), thiab lwm yam --- nqe lus-pickling-phosphating-txias daim duab-annealing (tuaj yeem rov ua dua nyob rau hauv ntau kis) Txij thaum pib mus rau qhov kawg ntawm cov txheej txheem) --- ncaj-yeeb nkab txiav-tshuaj ntsuam-ntim-khoom xa tuaj
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