(1) Lub degree ntawm kev koom tes ntawm cov hlau ntawv sib koom ua ke. Yog tias qhov sib koom ua ke ntawm cov ntawv hlau tsis ruaj khov, nws yuav ua rau cov hmoov av los yog huab cua oxidation ntawm cov tub ntxhais hlau thaum khoov, ntim, los yog uncoiling thiab straightening.
(2) Plhaub defects. Cov ntawv hlau coated feem ntau yog cov hlau uas tsis tshua muaj carbon nyias nyias nrog lub thickness ntawm 0.2-0.4mm, uas yog nquag khawb los yog xeb thaum lub sij hawm tsim khoom los yog cia thiab thauj, ua rau oxidation ntawm lub cov khoom siv tseem ceeb.
(3) Uniformity ntawm cross-sectional qhov ntev. Kev ua yuam kev ntau dhau ntawm qhov sib txawv ntawm qhov loj me ntawm cov tub ntxhais hlau yuav ua rau muaj kev hloov pauv loj thaum lub sijhawm ua haujlwm ntawm cov xaim feeder, uas ua rau tsis sib npaug ntawm kev pub noj ceev thiab cuam tshuam rau qhov sib ntxiv.
