1. Cov khoom tseem ceeb ntawm cov hlau tsis muaj steel yog Cr (chromium). Tsuas yog thaum cov ntsiab lus Cr ncav cuag ib qho nqi, cov hlau muaj corrosion kuj. Yog li, stainless hlau feem ntau muaj Cr (chromium) cov ntsiab lus tsawg kawg yog 10.5%.
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2. Stainless hlau kuj muaj Ni, TiI, Mn, N, Nb, Mo, Si, Cu thiab lwm yam. Kev tiv thaiv corrosion ntawm stainless hlau txo nrog kev nce ntawm cov ntsiab lus carbon. Yog li ntawd, cov ntsiab lus carbon ntawm feem ntau stainless hlau yog tsawg, nrog rau qhov siab tshaj plaws ntawm tsis ntau tshaj 1.2%. Lub wc (cov ntsiab lus carbon) ntawm qee cov hlau tseem qis dua 0.03% (00Cr12 ).
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3. Chromium yog qhov tseem ceeb tshaj plaws alloying caij hauv austenitic stainless hlau. Lub stainlessness thiab corrosion kuj ntawm austenitic stainless hlau yog tsuas yog tau los ntawm chromium txhawb lub passivation ntawm hlau thiab ua kom cov hlau ruaj khov nyob rau hauv qhov kev txiav txim ntawm cov kab mob. Passive tau tshwm sim.
4. Nyob rau hauv austenitic stainless hlau, chromium yog ib yam khoom uas muaj zog tsim thiab stabilizes hlau, shrinking lub austenite cheeb tsam. Raws li cov ntsiab lus hauv cov hlau nce, ferrite (6) qauv yuav tshwm sim hauv austenitic stainless hlau.
5. Kev tshawb fawb qhia tau hais tias nyob rau hauv chromium-nickel austenitic stainless hlau, thaum cov pa roj carbon ntsiab lus yog 0.1% thiab cov ntsiab lus chromium yog 18%, thiaj li yuav tau ib tug ruaj khov austenitic qauv, yam tsawg kawg nkaus nickel ntsiab lus yuav tsum tau. , uas yog hais txog 8%. Los ntawm qhov kev pom no, feem ntau siv 18Cr-8Ni hom chromium-nickel austenitic stainless hlau yog qhov tsim nyog tshaj plaws uas muaj chromium thiab npib tsib xee.