Tunlai machining production-a boiler awm dan ber pakhat chu pit furnace a ni a, pit furnace-in carbon compound spherical treatment-a steel-a a hman chuan a processing effect a tha zawk. A chhan chu he hmanrua hian thil siam chhuahnaah boruak a venghim fo thin a, chutiang chuan workpiece chuan a zawh hnuah surface accuracy tha tak a siam thei a, workpiece-a toughness leh stiffness chu a tha zawngin a tichiang thei bawk. Heng a thatnate hi a zirin, pit furnace hi social production-ah hman a ni nasa hle a, an mamawhna pawh kum tin a pung zel a ni.
Pit furnace hi gaseous emaw liquid fuel emaw hmangin a lum thei a, electric hmangin a lum thei bawk. Gaseous fuel hman a nih chuan multiple low-energy burners a awm tlangpui a, chu chu furnace chhung lam bang tangential direction-ah dah a ni a, a san zawng chu layer emaw spirals emaw-ah a inang tlanga dah a ni a, chu chuan meialh chu direct-a a silfai loh nan leh furnace chhunga temperature chu uniform a nih theih nan a enkawl a ni. Low-temperature tempering emaw oil fuel atana hman emaw atana hman a nih chuan, furnace-ah hian muffle wall te tak te siam a ni a, chu chuan combustion space chu heating space leh heating space a then a, mahse muffle wall nei pit furnace chuan fuel a ei tam zawk a ni.
