Cov hlau tsis xebYog ib hom hlau, hlau hais txog qhov nyiaj ntawm cov pa roj carbon (C) hauv 2% no hu ua hlau, ntau tshaj 2% yog hlau. Hauv cov txheej txheem smelting, hlau ntxiv chromium (Cr), nickel (Ni), manganese (Mn), silicon (Si), titanium (Ti), molybdenum (Mo) thiab lwm yam khoom sib xyaw ua ke los txhim kho kev ua tau zoo ntawm hlau kom hlau muaj kev tiv thaiv corrosion (uas yog, tsis yog xeb) yog peb feem ntau hais tias stainless hlau.
Cov hlau tsis xeb nyob rau hauv cov txheej txheem smelting, vim yog qhov ntxiv ntawm cov khoom sib xyaw ntawm ntau hom sib txawv, ntau hom sib txawv ntawm qhov ntau thiab tsawg sib txawv. Nws cov yam ntxwv kuj txawv, txhawm rau kom paub qhov txawv ntawm cov hlau sib txawv.
Kev faib tawm dav dav ntawm cov hlau tsis xeb
1. 304 stainless hlau
304 stainless hlau yog hom hlau feem ntau, ua ib hom hlau siv dav dav, muaj kev tiv thaiv corrosion zoo, tiv thaiv kub, lub zog kub qis thiab cov khoom siv kho tshuab; muaj peev xwm ua tau zoo rau kev luam ntawv, khoov thiab lwm yam txheej txheem thermal, tsis muaj kev kho cua sov hardening (tsis muaj hlau nplaum, ces siv qhov kub ntawm -196 ℃ ~ 800 ℃).
Daim Ntawv Thov: Cov khoom siv hauv tsev (1, 2 lub tais diav, txee, cov kav dej hauv tsev, cov cua sov dej, cov boilers, cov dab da dej); Cov khoom siv hauv tsheb (cov ntaub so iav, lub tshuab ua pa, cov khoom pwm); Cov Khoom Siv Kho Mob, Cov Khoom Siv Hauv Tsev, Chemistry, Kev Lag Luam Khoom Noj, Kev Ua Liaj Ua Teb, Cov Khoom Siv Hauv Nkoj
2. 304L stainless hlau (L yog cov pa roj carbon tsawg)
Raws li cov hlau carbon qis 304, feem ntau, nws qhov kev tiv thaiv corrosion zoo ib yam li 304, tab sis tom qab vuam lossis tshem tawm kev ntxhov siab, nws qhov kev tiv thaiv corrosion rau ciam teb ntawm cov noob yog qhov zoo heev; Yog tias tsis muaj kev kho cua sov, nws kuj tseem tuaj yeem tswj tau qhov kev tiv thaiv corrosion zoo, siv tau ntawm qhov kub -196 ℃ ~ 800 ℃.
Scope ntawm daim ntawv thov: siv rau hauv kev lag luam tshuaj lom neeg, thee thiab roj av nrog cov kev xav tau siab ntawm kev tiv thaiv rau cov ciam teb xeb ntawm cov tshuab sab nraum zoov, cov khoom siv tiv taus cua sov thiab cov khoom uas muaj teeb meem hauv kev kho cua sov.
3. 316 stainless hlau
316 stainless hlau vim muaj molybdenum ntxiv, yog li nws qhov kev tiv thaiv corrosion, atmospheric corrosion tsis kam thiab kub siab zog yog qhov tshwj xeeb zoo, tuaj yeem siv rau hauv cov xwm txheej hnyav; ua haujlwm zoo heev (tsis yog hlau nplaum).
Daim Ntawv Thov: Cov khoom siv dej hiav txwv, tshuaj lom neeg, xim pleev xim, ua ntawv, oxalic acid, chiv thiab lwm yam khoom siv tsim khoom; Cov duab, kev lag luam zaub mov, cov chaw ntug dej hiav txwv, cov hlua khi, CD rods, bolts, txiv ntoo.
4. 316L stainless (L yog cov pa roj carbon tsawg)
Raws li cov koob carbon qis ntawm 316 hlau, ntxiv rau cov yam ntxwv zoo ib yam li 316 hlau, nws qhov kev tiv thaiv rau kev xeb ntawm cov ciam teb nplej yog qhov zoo heev.
Scope ntawm daim ntawv thov: cov kev cai tshwj xeeb los tiv thaiv cov khoom xeb ntawm cov ciam teb nplej.
Kev Sib Piv Txog Kev Ua Tau Zoo
1. Cov tshuaj lom neeg muaj pes tsawg leeg
Cov hlau tsis xeb 316 thiab 316L yog cov hlau tsis xeb uas muaj molybdenum. Cov ntsiab lus molybdenum ntawm 316L hlau tsis xeb yog siab dua li ntawm 316 hlau tsis xeb me ntsis. Vim yog molybdenum hauv cov hlau, qhov kev ua tau zoo tag nrho ntawm cov hlau zoo dua li 310 thiab 304 hlau tsis xeb. Nyob rau hauv qhov kub siab, thaum qhov concentration ntawm sulfuric acid tsawg dua 15% thiab ntau dua 85%, 316 hlau tsis xeb muaj ntau yam kev siv. 316 hlau tsis xeb kuj muaj cov khoom zoo thiab chloride erosion, yog li nws feem ntau siv rau hauv Marine ib puag ncig. 316L hlau tsis xeb muaj cov ntsiab lus carbon siab tshaj plaws ntawm 0.03. Haum rau cov ntawv thov uas tsis tuaj yeem ua tiav kev annealing tom qab vuam thiab qhov twg xav tau kev tiv thaiv corrosion siab tshaj plaws.
2. Cokev tiv thaiv xeb
Qhov kev tiv thaiv corrosion ntawm 316 stainless hlau zoo dua li 304 stainless hlau. Nws muaj kev tiv thaiv corrosion zoo hauv cov txheej txheem tsim cov ntawv thiab pulp. Thiab 316 stainless hlau kuj tiv taus Marine thiab kev kub ntxhov hauv huab cua kev lag luam. Feem ntau, 304 stainless hlau thiab 316 stainless hlau muaj qhov tsis sib txawv me ntsis hauv kev tiv thaiv cov tshuaj corrosion, tab sis hauv qee qhov tshwj xeeb medias txawv.
304 stainless hlau tau tsim thawj zaug, uas muaj kev cuam tshuam rau Pitting Corrosion hauv qee kis. Ntxiv ntxiv 2-3% molybdenum txo qhov kev cuam tshuam no, ua rau 316. Tsis tas li ntawd, cov molybdenum ntxiv no tuaj yeem txo qhov xeb ntawm qee cov organic acids kub.
316 stainless hlau yuav luag dhau los ua cov khoom siv tseem ceeb hauv kev lag luam khoom noj thiab dej haus. Vim yog qhov tsis txaus molybdenum thoob ntiaj teb thiab cov ntsiab lus nickel ntau dua hauv 316 stainless hlau, 316 stainless hlau kim dua 304 stainless hlau.
Kev xeb pitting yog ib qho xwm txheej tshwm sim los ntawm kev xeb tso rau ntawm qhov chaw ntawm cov hlau tsis xeb, uas yog vim tsis muaj oxygen thiab tsis tuaj yeem tsim ib txheej tiv thaiv ntawm chromium oxide. Tshwj xeeb tshaj yog nyob rau hauv cov li qub me me, muaj me ntsis txoj hauv kev ntawm kev tso rau ntawm lub disc, yog li pitting yog tsawg.
Hauv ntau hom dej nruab nrab (dej distilled, dej haus, dej ntws, dej boiler, dej hiav txwv, thiab lwm yam), 304 stainless hlau thiab 316 stainless hlau corrosion resistance yuav luag zoo ib yam, tshwj tsis yog tias cov ntsiab lus ntawm chloride ion hauv nruab nrab yog siab heev, lub sijhawm no 316 stainless hlau yog qhov tsim nyog dua. Feem ntau, corrosion resistance ntawm 304 stainless hlau thiab 316 stainless hlau tsis sib txawv ntau, tab sis qee zaum yuav txawv heev, yuav tsum tau soj ntsuam ntawm ib rooj plaub-rau-ib rooj plaub.
3. Kev tiv thaiv cua sov
316 stainless hlau muaj kev tiv thaiv oxidation zoo hauv kev siv tsis tu ncua hauv qab 1600 degrees thiab siv tas mus li hauv qab 1700 degrees. Hauv qhov ntau ntawm 800-1575 degrees, nws yog qhov zoo tshaj plaws kom tsis txhob cuam tshuam tas mus li ntawm 316 stainless hlau, tab sis nyob rau hauv qhov kub ntawm kev siv tas mus li ntawm 316 stainless hlau, cov hlau stainless hlau muaj kev tiv thaiv cua sov zoo. 316L stainless hlau muaj kev tiv thaiv zoo dua rau cov carbide nag lossis daus dua li 316 stainless hlau, uas tuaj yeem siv rau hauv qhov kub saum toj no.
4. Kev kho cua sov
Kev ua kom kub hnyiab yog ua tiav hauv qhov kub ntawm 1850 txog 2050 degrees, ua raws li kev ua kom kub hnyiab sai thiab tom qab ntawd txias sai. 316 stainless hlau tsis tuaj yeem ua kom sov dhau kom tawv.
5. Lub vuam
316 stainless hlau muaj peev xwm vuam zoo. Txhua txoj kev vuam txheem tuaj yeem siv rau kev vuam. Raws li lub hom phiaj ntawm kev vuam, 316CB, 316L lossis 309CB stainless hlau packing rod lossis electrode tuaj yeem siv rau kev vuam. Yuav kom tau txais qhov zoo tshaj plaws corrosion tsis kam, qhov vuam seem ntawm 316 stainless hlau yuav tsum tau annealed tom qab vuam. Post weld annealing tsis tas yuav yog 316L stainless hlau siv.
Hikelokcov yeeb nkab tsis xeb hlau tsis muaj seamlesssiv cov khoom siv 316L. lwm cov yeeb nkab fittings thiab li qub feem ntau siv cov khoom siv 316.
Lub sijhawm tshaj tawm: Lub Ob Hlis-23-2022