Cement ntsia thawv, feem ntau hu ua cov ntsia hlau ntsia hlau, yog cov ntsia hlau, siv cov pa roj carbon steel ntau lawm, cov khoom muaj 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 hauv qee qhov nyuaj rau lwm cov ntsia hlau ntawm ...
Nyeem ntxiv