Qhov sib txawv tseem ceeb ntawm cov hlau dub thiab cov hlau me me yog cov hlau dub muaj xim xiav tsaus thiab oily nto, hos cov hlau me me muaj cov xim grey thiab tsis muaj roj.
Hlau yog ib qho hlau ntawm hlau, carbon, thiab lwm yam tshuaj lom neeg. Cov ntsiab lus carbon nyob rau hauv cov alloy no nce mus txog 2% los ntawm qhov hnyav. Cov khoom tseem ceeb tshaj plaws ntawm cov hlau no yog lub zog tensile siab thiab tus nqi qis. Qhov no yog cov khoom siv tshaj plaws rau kev tsim kho vaj tse. Tsis tas li ntawd, nws muaj txiaj ntsig zoo rau kev tsim cov cuab yeej rau kev tsim kho thiab.
Dab tsi yog hlau?
Dub steel lossis dub carbon steel yog cov hlau alloy lossis sib xyaw ntawm hlau thiab carbon nrog rau qee yam hlau me me. Feem ntau, cov hlau ntshiab yog mos txawm tias peb tuaj yeem yaj nws thiab ua nws rau hauv cov duab uas xav tau. Qhov sib ntxiv ntawm cov pa roj carbon rau cov hlau ntshiab tuaj yeem ua rau lub zog ntawm cov hlau, thiab feem ntau carbon steel hom muaj 1-2% carbon. Feem ntau, cov hlau dub yog tsim thaum lub sij hawm tsim cov hlau, qhov kub siab tuaj yeem tsim cov txheej nyias ntawm cov hlau uas yog oxidized. Cov txheej hlau oxidized no yog tsim rau ntawm cov hlau sab nraud.
Feem ntau, hlau nyiam ua kom yooj yim nrog oxygen hauv huab cua. Cov tshuaj tiv thaiv no tsim cov hlau oxide, feem ntau hu ua xeb. Qhov kev tsim xeb no tuaj yeem ua rau tsis ua haujlwm ntawm qee qhov ntawm cov hlau. Yog li ntawd, qhov saum npoo ntawm hlau yog feem ntau coated los tiv thaiv nto xeb tsim. Ib qho txiaj ntsig tseem ceeb ntawm cov hlau dub yog nws cov cuab yeej tiv thaiv corrosion, uas los ntawm cov hlau oxide dub txheej. Cov txheej txheem oxide tuaj yeem ua qhov thaiv kom tsis txhob muaj cov pa oxygen los ntawm txheej hlau uas nyob hauv qab no. Cov txheej txheej oxide nyias no ua rau ntawm qhov kub thiab txias, yog li cov hlau tsis xav tau txheej txheej.
Cov hlau dub feem ntau yog siv rau cov kav dej lossis cov kav dej. Qhov no yog vim cov hlau dub muaj tus nqi qis ntawm kev tsim khoom, thiab nws tseem tuaj yeem ua tau yooj yim welded siv yooj yim, ntau txoj kev. Feem ntau, qee cov kav dej nyob deb siv cov hlau no uas tuaj yeem tiv thaiv xeb sai. Ntxiv mus, peb tuaj yeem siv cov hlau dub hauv kev nyab xeeb lossis hauv av uas muaj nyob rau hauv kev hloov pauv lossis nrawm dua corrosion. Txawm li cas los xij, qee zaum peb yuav xav tau txheej txheej ntxiv lossis kev tiv thaiv.
Mild Steel yog dab tsi?
Mild steel yog hom carbon hlau uas muaj cov pa roj carbon tsawg los ntawm qhov hnyav. Cov pa roj carbon ntau hauv cov hlau no yog nyob ib ncig ntawm 0.2%. Lwm cov ntsiab lus tseem ceeb hauv nws yog manganese, silicon, sulfur, thiab phosphorus. Cov hlau me me yog qhov tseem ceeb hauv kev lag luam. Txawm li cas los xij, peb kuj siv cov khoom siv no hauv cov cuab yeej peb siv hauv peb lub neej niaj hnub.
Ib qho tseem ceeb ntawm cov hlau me me yog tias nws tsis nkig. Ntxiv mus, nws tsis nkag mus rau hauv cov txheej txheem tempering thiab muaj ntau lub zog. Tsis tas li ntawd, nws yog ib tug zoo hluav taws xob conductor. Yog li ntawd, peb tuaj yeem siv nws hauv vuam. Ntxiv mus, nws muaj siab malleability vim cov ntsiab lus carbon tsawg. Vim nws cov khoom ferromagnetic, peb tuaj yeem yooj yim magnetize me me hlau. Tsis tas li ntawd, cov khoom siv no tsim nyog rau kev tsim qauv. Txawm li cas los xij, piv rau cov hlau tsis muaj cov pa roj carbon tsawg, cov khoom siv no muaj cov pa roj carbon ntau dua thiab ua rau corrosion.
Dab tsi yog qhov txawv ntawm cov hlau dub thiab cov hlau me me?
Dub steel lossis dub carbon steel yog cov hlau alloy lossis sib xyaw ntawm cov hlau thiab carbon nrog rau cov khoom me me ntawm lwm cov hlau. Cov hlau me me yog ib hom carbon hlau uas muaj cov pa roj carbon tsawg los ntawm qhov hnyav. Qhov sib txawv tseem ceeb ntawm cov hlau dub thiab cov hlau me me yog cov hlau dub muaj xim xiav tsaus thiab oily nto, hos cov hlau me me muaj cov xim grey thiab tsis muaj roj.
Cov hauv qab no infographic nthuav tawm qhov sib txawv ntawm cov hlau dub thiab cov hlau me me hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Dub Steel vs Mild Steel
Steel yog ib qho alloy ntawm hlau thiab carbon nrog rau lwm yam tshuaj. Cov ntsiab lus carbon nyob rau hauv cov alloy no nce mus txog 2% los ntawm qhov hnyav. Qhov sib txawv tseem ceeb ntawm cov hlau dub thiab cov hlau me me yog cov hlau dub muaj xim xiav tsaus thiab oily nto, hos cov hlau me me muaj cov xim grey thiab tsis muaj roj.
