Tua cov hlauYog cov hlau uas tau ua tiav ntawm tus neeg sawv cev ua ntej yuav tsum tau ua rau xws li uas muaj kev xyaum ntawm cov roj thaum lub sijhawm. Nws yog tus cwj pwm los ntawm qib siab ntawm cov homogene tshuaj lom neeg thiab kev ywj pheej ntawm cov pa yeeb ntxig.

Cov hlau tua phom yog feem ntau cov hlau steelidized, tab sis cov pa roj carbon monoxide, tab sis cov pa roj carbon monoxide hom porosity faib thoob plaws hauv kev ingot. Lub porosity tshem tawm cov yeeb nkab pom nyob rau hauv kev tua hlau thiab nce tawm cov txiaj ntsig mus rau kwv yees li 90% los ntawm qhov hnyav. Kev tua cov hlau uas nquag siv rau cov qauv hlau nrog cov ntsiab lus carbon nrog 0.15 thiab 0.25% carbon, vim tias nws dov, uas kaw qhov porosity.

Rimmed Hlau, Kuj tseem hu ua kev kos duab zoo steel, muaj me ntsis rau tsis muaj tus neeg saib ntxim hlub tus neeg sawv cev ntxiv rau nws thaum ua rau cov pa roj carbon monoxide kom hloov pauv sai sai ntawm cov ingot. Qhov no ua rau me tshuab cov qhov hauv qhov chaw uas tom qab kaw rau hauv cov txheej txheem kub kub. Feem ntau cov paj tawv hlau muaj cov ntsiab lus carbon 0.25%, cov ntsiab lus manganese ntawm cov ntsiab lus tsis zoo hauv qab 0.6%, thiab tsis pom zoo rau cov ntawv thov ua haujlwm kub.