Cement ntsia thawv, feem ntau hu ua tus ntsia thawv hlau, yog ib hom ntsia hlau, siv cov pa roj carbon steel ntau lawm,
Cov khoom siv yog 45 steel lossis 60 steel, tom qab xaim kos duab, annealing, ntsia thawv tsim, quenching thiab lwm yam
txheej txheem, yog li qhov kev ntxhib los mos kuj nyuaj.Nws txoj haujlwm yog ua rau ntsia hlau rau qee qhov nyuaj rau lwm cov ntsia hlau ntsia