Mild Steel vs Stainless hlau
Hlau tuaj yeem categorized li alloy. Ib qho alloy yog tsim los ntawm kev sib xyaw ob lossis ntau lub ntsiab lus, qhov tsawg kawg yog ib qho ntawm nws yog hlau. Feem ntau cov hlau yog tau los ntawm kev sib xyaw cov pa roj carbon feem ntau thiab lwm cov ntsiab lus hauv cov lej nrog cov hlau txhawm rau kom tau txais ntau yam khoom tsim tau ntau dua li siv hlau ua cov hlau dawb. Cov ntsiab lus no feem ntau yog sib xyaw raws li qhov hnyav feem pua thiab nyob ntawm seb cov khoom sib xyaw steel tuaj yeem muab faib ua ntau qib. Carbon steel thiab stainless hlau yog feem ntau ntawm lawv.
Mild Steel
Cov hlau me me yog cov pa roj carbon tsawg tshaj plaws, muaj qhov sib piv qis ntawm cov pa roj carbon monoxide uas ntsuas txog 0.25% ntawm nws qhov siab tshaj plaws. Carbon ua raws li tus neeg sawv cev hardening. Cov hlau me kuj tseem tuaj yeem muaj lwm cov ntsiab lus xws li manganese, silicon ze li ntawm 0.5% hauv qhov hnyav thiab cov lej ntawm phosphorous. Cov ntsiab lus ntxiv no tiv thaiv kev ncaj ncees ntawm cov qauv hlau hlau los ntawm kev tiv thaiv kev tsis sib haum xeeb hauv cov hlau lead.
Cov hlau me me yog cov hlau ntau tshaj plaws thiab siv hauv 85% ntawm tag nrho cov khoom hlau, hauv Tebchaws Meskas ib leeg. Lwm yam khoom uas xav tau ntawm nws muaj xws li tsis ua nkig, ua kom muaj zog dua hlau, thiab tseem pheej yig. Lub zog ntawm cov hlau feem ntau nce nrog feem pua ntawm cov pa roj carbon ntxiv. Cov hlau me me feem ntau yog siv los tsim cov ntawv hlau, cov xov hlau thiab lwm yam khoom siv hauv tsev.
Stainless hlau
Stainless steel tau txais nws lub npe los ntawm cov cuab yeej uas tsis yog corrosive. Qhov tshwj xeeb no yog vim muaj lwm yam hlau ntxiv rau hlau; ze rau 18% ntawm chromium thiab 8% ntawm npib tsib xee. Tus nqi ntawm cov hlau suav nrog kwv yees li 73% ntawm tag nrho qhov hnyav. Stainless hlau kuj suav nrog ze li 0.3% ntawm carbon. Qhov tseem ceeb ntawm nws qhov xwm txheej tsis yog corrosive, stainless hlau feem ntau yog siv rau hauv cov khoom siv hauv chav ua noj, ua cov hniav txiab, lub dab teg, thiab hauv kev tsim cov khoom siv tsheb, cov qauv hauv aerospace, thiab cov tsev loj.
Hlau thaum sib cuag nrog huab cua thiab noo noo yuav xeb. Ntawm no, hlau oxidizes tsim "hlau oxide". Nyob rau hauv cov ntaub ntawv ntawm stainless hlau, chromium ua raws li ib tug passive zaj duab xis nyob ib ncig ntawm lub hlau core tsim "chromium oxide", uas tiv thaiv ntxiv nto corrosion thiab kuj kis tau ntawm corrosion mus rau lub internal hlau core. Cov txheej txheem no hu ua "passivation" qhov twg cov hlau ua dhau los ntawm qhov cuam tshuam ntawm nws ib puag ncig, tshwj xeeb tshaj yog thaum muaj txheej txheej tiv thaiv cov hlau los ntawm corrosion. Passivation yog cov txheej txheem tseem ceeb uas ua kom muaj zog thiab khaws cia zoo li cov hlau ua kom muaj nuj nqis ntau dua.
Qhov txawv ntawm Mild Steel thiab Stainless Steel yog dab tsi?
• Stainless hlau feem ntau txawv ntawm cov hlau me me (carbon steel) nyob rau hauv muaj pes tsawg leeg, los ntawm tus nqi ntawm chromium tam sim no.
• Stainless hlau yog resistant rau corrosion whereas me me hlau yooj yim corrodes thiab xeb thaum raug huab cua thiab noo noo.
• Stainless hlau yog ntau formable nyob rau hauv lub cim thaum me me hlau yog nruj thiab tawv.
• Chromium feem ntau yog ntsuas raws li cov hlau hnyav. Yog li ntawd, vim muaj cov chromium, stainless hlau tuaj yeem muaj kev phom sij rau tib neeg kev noj qab haus huv, tshwj xeeb tshaj yog thaum siv cov khoom siv hauv tsev ntau dhau.
