Melting ntawm Cast Steel. Cam khwb cia hlau yuav tsum tau yaj nyob rau hauv hluav taws xob rauv, feem ntau yog hluav taws xob arc rauv thiab induction furnaces. Nyob ntawm cov khoom siv hauv lub tshuab hluav taws xob thiab cov txheej txheem slag siv, lawv tuaj yeem muab faib ua acidic thiab yooj yim furnaces. Cov pa roj carbon steel thiab qis- alloy steel tuaj yeem yaj hauv ob hom rauv, tab sis siab - alloy steel tsuas tuaj yeem yaj hauv cov cub tawg yooj yim.
Txheej txheem Casting. Cam khwb cia hlau muaj lub siab melting point thiab tsis zoo fluidity, thiab cov hlau molten yog nquag oxidation thiab gas absorption. Nyob rau tib lub sijhawm, nws qhov ntim shrinkage tus nqi yog 2 mus rau 3 npaug ntawm grey cam khwb cia hlau. Yog li ntawd, cam khwb cia hlau muaj cov khoom tsis zoo thiab ua rau muaj qhov tsis zoo xws li kev ua tsis tiav, porosity, shrinkage kab noj hniav, kub tawg, xuab zeb adhesion, thiab deformation. Txhawm rau tiv thaiv cov teeb meem no, cov kev ntsuas sib raug yuav tsum tau ua hauv cov txheej txheem.
Cov xuab zeb moulding siv los tsim cov hlau cam khwb cia yuav tsum muaj siab refractoriness thiab tsis kam rau cov xuab zeb adhesion, nrog rau siab zog, permeability, thiab collapsibility. Cov xuab zeb nyoos feem ntau siv cov xuab zeb loj, zoo li silica; txhawm rau tiv thaiv cov xuab zeb adhesion, qhov saum npoo ntawm cov pwm kab noj hniav feem ntau coated nrog ntau refractory txheej; rau kev tsim cov khoom loj, cov xuab zeb qhuav los yog dej iav xuab zeb pwm feem ntau siv. Txhawm rau txhim kho lub zog thiab collapsibility ntawm pwm, ntau yam additives feem ntau ntxiv rau cov xuab zeb molding.
Nyob rau hauv tus tsim ntawm lub rooj vag system thiab risers. Vim hais tias cam khwb cia carbon steel nyhav rau solidify txheej los ntawm txheej thiab muaj loj shrinkage, lub hauv paus ntsiab lus ntawm sequential solidification feem ntau yog siv los tsim lub rooj vag system thiab risers los tiv thaiv shrinkage kab noj hniav thiab porosity. Feem ntau, risers yog teem rau cam khwb cia hlau qhov chaw. Chillers kuj tau siv dav. Tsis tas li ntawd, ib qho hauv qab -gating system nrog cov duab yooj yim thiab tus ntoo khaub lig loj-sectional cheeb tsam yuav tsum tau siv ntau li ntau tau kom cia cov hlau molten sau cov pwm sai thiab du.
Kev kho cua sov. Thaum tshav kub kub kev kho mob ntawm cam khwb cia hlau feem ntau yog annealing los yog normalizing. Annealing feem ntau yog siv rau cam khwb cia hlau qhov chaw nrog w(C) Ntau dua los yog sib npaug li 0.35% los yog cov uas muaj cov qauv tshwj xeeb. Cov castings no muaj cov yas tsis zoo, siab casting kev nyuaj siab, thiab nws yooj yim rau tawg. Normalizing feem ntau yog siv rau cam khwb cia hlau qhov chaw nrog w(C) Tsawg dua los yog sib npaug rau 0.35%. Cov hlau no muaj cov ntsiab lus carbon tsawg, zoo plasticity, thiab tsis tshua muaj kev tawg thaum lub caij txias.
