Lub melting ntawm siab -kub alloy steel castings muaj ob peb lub ntsiab lus tseem ceeb uas yuav tsum tau saib xyuas. Thawj yog xaiv thiab npaj cov khoom siv raw. High- cov khoom siv raw zoo yuav tsum raug xaiv kom ntseeg tau tias lawv cov tshuaj muaj pes tsawg leeg ua tau raws li qhov xav tau. Rau qee cov ntsiab lus tseem ceeb, xws li chromium, nickel, thiab molybdenum, lawv cov ntsiab lus yuav tsum raug tswj kom raug. Qhov saum npoo ntawm cov ntaub ntawv raw yuav tsum huv thiab tsis muaj roj, xeb, thiab lwm yam impurities kom tsis txhob cuam tshuam qhov zoo ntawm cov hlau molten. Ua ntej melting, cov ntaub ntawv raw yuav tsum tau ua ntej - kho, xws li ziab thiab tshem tawm nplai.
Hais txog cov khoom siv melting, yuav tsum xaiv lub cub tawg uas tsim nyog. Feem ntau siv melting furnaces muaj xws li hluav taws xob arc rauv thiab induction furnaces. Hluav taws xob arc rauv muaj qhov zoo ntawm kev ceev melting ceev thiab meej tswj cov hlau ua kua muaj pes tsawg leeg, tab sis lawv muaj ntau zog noj; induction furnaces muaj cua sov ceev ceev, zoo steel kua zoo, thiab kuj txo lub zog noj. Qhov tsim nyog melting rauv yuav tsum raug xaiv raws li qhov ntau lawm thiab cov kev xav tau ntawm cov castings. Thaum lub sij hawm melting txheej txheem, lub melting kub yuav tsum nruj me ntsis tswj. High-kub alloy steels feem ntau muaj cov ntsiab lus melting siab, yuav tsum tau kub melting kub kom ntseeg tau cov fluidity thiab homogeneity ntawm cov hlau molten. Txawm li cas los xij, qhov kub thiab txias ntau dhau yuav ua rau qhov kub hnyiab ntawm cov ntsiab lus alloy hauv cov hlau molten, txo qhov zoo ntawm cov hlau molten.
Yog li ntawd, lub melting kub yuav tsum tau txiav txim siab raws li qhov muaj pes tsawg leeg ntawm cov hlau alloy thiab cov yam ntxwv ntawm cov khoom siv melting. Nyob rau tib lub sijhawm, cov cua sov thiab lub sijhawm tuav yuav tsum tau tswj xyuas kom ntseeg tau tias cov hlau molten yog tag nrho melted thiab homogenized. Deoxidation thiab degassing kuj yog cov kauj ruam tseem ceeb. Cov hlau molten muaj qee cov pa oxygen thiab cov pa roj, uas yuav cuam tshuam rau qhov zoo ntawm cov castings. Thaum lub sij hawm melting txheej txheem, deoxidizers yuav tsum tau ntxiv rau deoxidation; Feem ntau siv deoxidizers suav nrog txhuas, silicon, thiab manganese. Ib txhij, cov txheej txheem tsim nyog yuav tsum tau siv rau kev degassing, xws li kev kho lub tshuab nqus tsev thiab argon tshuab, kom txo cov roj cov ntsiab lus hauv cov hlau molten thiab txo qhov tsis xws luag xws li pores hauv cov castings. Thaum lub sij hawm txheej txheem alloying, cov ntsiab lus alloy yuav tsum tau ntxiv kom raug.
