Oxygen-free tooj liab yog tooj liab tooj liab, xim liab tau dawb. Yog hais tias tooj liab tooj liab tau raug rhaub, nws reacts nrog oxygen los ua tooj liab oxide, uas yog cov pa oxygen muaj tooj liab, uas tseem muaj cov khoom tawv thiab dub.
Hauv txoj ntsiab cai, cov tooj tsis muaj pa oxygen yog tooj liab ntshiab uas tsis muaj oxygen los yog cov khoom deoxidizer zoo. Tab sis qhov tseeb nws tseem muaj cov pa me me heev thiab qee qhov tsis zoo. Raws li tus txheej txheem, cov ntsiab lus oxygen tsis pub ntau dua 0.03%, cov ntsiab lus tsis huv yog tsis ntau dua 0.05%, thiab cov tooj liab tsis huv ntau dua 99.95%.
Raws li cov ntsiab lus oxygen thiab cov ntsiab lus tsis huv, tooj liab tsis pub tooj liab tau muab faib ua Tooj 1 thiab No. 2 cov pa oxygen tsis muaj tooj. Qhov kev coj dawb huv ntawm No.1 cov pa uas tsis pub tooj liab ncav mus txog 99.97%, cov ntsiab lus oxygen tsis pub ntau tshaj 0.003%, thiab tag nrho cov ntsiab lus ntawm impurities tsis yog ntau dua 0.03%; kev coj dawb huv ntawm No.2 oxygen-tsis pub tooj liab ncav mus txog 99.95%, cov ntsiab lus oxygen tsis pub ntau tshaj 0.003%, thiab cov ntsiab lus tag nrho ntawm impurities tsis yog ntau dua 0.05%.
Cov ntshiab tooj liab yog cov tooj liab nrog cov ntsiab lus tooj liab siab tshaj plaws, vim tias cov xim liab kuj hu ua tooj liab liab, lub ntsiab tiv yog tooj liab ntxiv nyiaj, cov ntsiab lus yog 99.7 ～ 99.95%; lub ntsiab impurity ntsiab: phosphorus, bismuth, antimony, arsenic, iron, nickel, lead, tin, Sulphur, zinc, oxygen, thiab lwm yam.; siv los ua cov khoom siv conductive, qib high-qib tooj liab alloys, tooj liab raws li cov tooj hlau kom haum.
Cov tooj ua cov tooj liab ntshiab tau muab faib ua: tooj liab liab zoo tib yam (T1, T2, T3), tooj liab tsis muaj tooj (tooj tsis pub tooj liab, tooj liab tsis pub tooj liab, zirconium oxygen-tooj liab thiab tsis muaj tooj liab-paug tooj liab), phosphorus deoxidized tooj liab, thiab ib qho me me ntawm tau ntxiv Alloy cov ntsiab lus tshwj xeeb tooj liab (arsenic tooj liab, tooj liabururium, tooj liab nyiaj, tooj liab tooj liab thiab zirconium tooj liab) plaub hom. Qhov hluav taws xob ua hluav taws xob thiab thermal conductivity ntawm ntshiab tooj liab yog thib ob kom tau nyiaj, thiab nws yog dav siv nyob rau hauv kev tsim cov khoom siv hluav taws xob thiab thermal. Tooj liab liab muaj cov tshuaj tiv thaiv zoo hauv huab cua, dej hiav txwv, qee qhov tsis muaj oxidizing acids (hydrochloric acid, dilute sulfuric acid), alkali, ntsev tov thiab ntau yam ntawm cov organic acids (acetic acid, citric acid), thiab yog siv hauv tshuaj lom neeg kev lag luam. Tsis tas li ntawd, liab tooj liab tau zoo weldability thiab tuaj yeem tsim rau hauv ntau yam khoom tiav thiab ua tiav los ntawm kev txias thiab thermoplastic. Xyoo 1970, kev tawm tooj liab tooj liab ntau dua qhov tawm tag nrho ntawm lwm hom tooj liab alloys.