Cov hlau sheath nyob ib puag ncig lub tshuab hluav taws xob cua sov ua haujlwm ua ob qho tib si lub tshav kub hloov chaw thiab lub hauv paus thaiv kev tawm tsam tshuaj lom neeg. Xaiv cov khoom siv tsis raug rau ib puag ncig kev ua haujlwm tau lees tias tsis ua haujlwm ntxov ntxov txawm hais tias cov khoom siv sab hauv tsim tau zoo npaum li cas. Kev nkag siab txog kev sib pauv ntawm cov nqi, qhov kub thiab txias, thiab kev tiv thaiv corrosion ua kom paub meej cov kev txiav txim siab uas sib npaug nrog kev lag luam.
Stainless hlau 304 sawv ua cov khoom siv ua haujlwm rau kev siv dav dav. 18% chromium cov ntsiab lus tsim cov txheej txheem tiv thaiv oxide uas tiv thaiv oxidation txog li 800℃hauv huab cua. Nyob rau hauv ib puag ncig aqueous, 8% nickel cov ntsiab lus muab qhov tsim nyog tiv thaiv rau cov mob me me. Rau cov dej cua sov, kev ua zaub mov, thiab kev siv cov yas molding, 304 stainless hlau muaj qhov sib npaug ntawm kev ua tau zoo thiab tus nqi. Cov khoom siv welds ntseeg tau, tshuab kom huv si, thiab tswj cov txheej txheem kev ncaj ncees thoob plaws qhov kub thiab txias.
Stainless hlau 316L ntxiv molybdenum rau cov alloy muaj pes tsawg leeg, txhim khu kev tiv thaiv chloride nres thiab sulfuric acid ib puag ncig. Cov ntawv thov suav nrog cov dej ntsev, cov tshuaj brine, lossis cov dej hiav txwv ntawm ntug dej hiav txwv tau txais txiaj ntsig los ntawm kev hloov kho no. Lub npe "L" qhia txog cov ntsiab lus ntawm cov pa roj carbon tsawg, txo qis kev nkag siab ntawm kev nkag siab thiab cuam tshuam ntawm intergranular corrosion thaum vuam lossis txuas ntxiv siab - qhov kub thiab txias. Rau kev ua tshuaj lom neeg thiab kev siv dej hiav txwv, tus nqi qis tshaj li 304 stainless hlau them nyiaj faib rau hauv kev pab cuam ntev.
Incoloy 800 thiab Incoloy 840 sawv cev rau npib tsib xee- hlau-chromium alloys tsim tshwj xeeb rau siab - kub oxidation kuj. Cov ntaub ntawv no tuav cov txheej txheem muaj zog thiab tiv thaiv oxide txheej ntawm qhov kub siab tshaj 1000 degree, ua rau lawv qhov tseem ceeb rau kev siv lub tshuab hluav taws xob, siab - cua kub cua sov, thiab cov txheej txheem cuam tshuam nrog cov thermal cycling tseem ceeb. Cov ntsiab lus ntau dua nickel muab kev tiv thaiv zoo tshaj rau carburization thiab nitriding atmospheres piv rau stainless hlau.
titanium thiab titanium alloys nkag mus rau hauv daim duab thaum cov tshuaj lom neeg ua phem txawm tias siab -nickel alloys. Cov tshuaj chloride, hypochlorite bleach, thiab qee cov organic acids rhuav tshem stainless hlau thiab Incoloy sheaths nyob rau hauv lub hlis thaum titanium tseem tsis cuam tshuam. Tus nqi ntawm cov khoom siv tau nce siab dua, thiab vuam yuav tsum muaj cov cuab yeej tshwj xeeb thiab cov tswv yim, tab sis rau kev siv tshuaj lom neeg tseem ceeb, titanium cua sov cov ntsiab lus muab qhov tsis sib haum xeeb corrosion.
Tooj liab thiab tooj liab alloys muab tshwj xeeb thermal conductivity rau daim ntaub ntawv uas ceev ceev hloov mus rau qhov tseem ceeb. Cov dej cua kub hauv cov tsev nyob thiab cov chaw lag luam boilers feem ntau siv tooj liab sheaths kom ua tau zoo tshaj plaws. Txawm li cas los xij, cov khoom siv txwv kev ua haujlwm kub txog li 200℃thiab ua pov thawj muaj kev cuam tshuam rau ammonia, sulfur compounds, thiab acidic tej yam kev mob. Cov khoom siv tshuaj tua kab mob ntawm tooj liab muab cov txiaj ntsig tsis zoo hauv cov dej haus.
Rau D- hom cais ib lub taub hau hluav taws xob cua sov raj, sheath xaiv cov ntaub ntawv yuav tsum suav rau ob qho tib si sab nraud ib puag ncig thiab cov txheej txheem sab hauv. Qhov sib cais sheath tsim yuav tsum tau cov ntaub ntawv nrog txaus elasticity kom haum raws li kev nthuav dav thiab contraction cycles yam tsis muaj qaug zog tawg. Stainless hlau thiab Incoloy alloys ua tau raws li qhov yuav tsum tau ua thaum muab qhov tsim nyog kub thiab corrosion tsis kam rau kev thov kev lag luam.
Kev xaiv cov khoom siv kuj cuam tshuam rau kev siv hluav taws xob. High-emissivity ceramic coatings tuaj yeem txhim kho cov hluav taws xob hloov hluav taws xob thiab txhim kho cov cua sov kom ntev, sawv cev rau thaj chaw tseem ceeb ntawm kev tshawb fawb thiab kev loj hlob hauv cov tshuab cua sov.
