Ntawm ntau hom hlau tsis xeb, qib 304, 304L, thiab 304H yog cov feem ntau siv. Txawm hais tias lawv zoo sib xws, txhua qib muaj nws cov yam ntxwv thiab kev siv tshwj xeeb.
Qib304 stainless hlauyog qhov siv dav tshaj plaws thiab siv tau ntau yam ntawm 300 series stainless hlau. Nws muaj 18-20% chromium thiab 8-10.5% nickel, nrog rau me me ntawm carbon, manganese, thiab silicon. Qib no muaj kev tiv thaiv corrosion zoo heev thiab zoo formability. Nws feem ntau yog siv rau hauv cov ntawv thov xws li cov khoom siv hauv chav ua noj, kev ua zaub mov, thiab kev kho kom zoo nkauj architectural.
304L cov yeeb nkab tsis xebyog cov yeeb nkab hlau uas muaj cov pa roj carbon tsawg ntawm qib 304, nrog rau cov pa roj carbon ntau tshaj plaws ntawm 0.03%. Cov pa roj carbon tsawg no pab txo cov carbide precipitation thaum lub sijhawm vuam, ua rau nws tsim nyog rau kev siv vuam. Cov pa roj carbon tsawg dua kuj txo qhov kev pheej hmoo ntawm kev ua xua, uas yog kev tsim cov chromium carbides ntawm cov ciam teb ntawm cov noob, uas tuaj yeem ua rau muaj kev xeb intergranular. 304L feem ntau siv rau hauv kev siv vuam, nrog rau cov chaw uas muaj kev pheej hmoo ntawm kev xeb, xws li kev ua tshuaj lom neeg thiab cov khoom siv tshuaj.
304H stainless hlauyog ib qho carbon ntau dua ntawm qib 304, nrog rau cov ntsiab lus carbon xws li 0.04-0.10%. Cov ntsiab lus carbon ntau dua muab lub zog kub zoo dua thiab tiv taus kev nkag mus. Qhov no ua rau 304H haum rau cov ntawv thov kub siab, xws li cov hlab ntsha siab, cov khoom hloov pauv cua sov, thiab cov boilers kev lag luam. Txawm li cas los xij, cov ntsiab lus carbon ntau dua kuj ua rau 304H yooj yim dua rau kev hnov mob thiab kev xeb intergranular, tshwj xeeb tshaj yog hauv kev siv vuam.
Hauv kev xaus, qhov sib txawv tseem ceeb ntawm cov qib no yog lawv cov pa roj carbon thiab qhov cuam tshuam rau kev vuam thiab kev siv kub siab. Qib 304 yog qhov siv dav tshaj plaws thiab siv dav dav, thaum 304L yog qhov kev xaiv zoo tshaj plaws rau kev siv vuam thiab ib puag ncig uas muaj kev txhawj xeeb txog kev xeb. 304H muaj cov pa roj carbon ntau dua thiab tsim nyog rau kev siv kub siab, tab sis nws qhov kev cuam tshuam rau kev rhiab heev thiab kev xeb intergranular yuav tsum tau xav txog zoo. Thaum xaiv ntawm cov qib no, nws yog ib qho tseem ceeb uas yuav tsum xav txog cov kev cai tshwj xeeb ntawm daim ntawv thov, suav nrog ib puag ncig ua haujlwm, kub, thiab kev xav tau vuam.
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