High - ib puag ncig kub (200-500 degree) - xws li cov chaw tsim khoom siv hluav taws xob, siab - cov kav dej kub, lossis chav cav - ua rau muaj kev sib tw tshwj xeeb rau cov qauv hlau: qhov kub siab hloov pauv cov hlau sab hauv, muaj peev xwm txo tau lub zog, toughness, thiab creep resistance. Rau cov haujlwm uas siv S355K2W Corten Steel hauv siab - qhov kev pabcuam kub, cov lus nug tseem ceeb tshwm sim: Nws qhov kev ua haujlwm zoo li cas hauv 200-500 degree? Cov lus teb meej, hauv paus hauv EN 10025-5 cov qauv thiab cov ntaub ntawv ntsuas kub siab, yog qhov tseeb:S355K2W tswj kev ruaj ntseg zoo ntawm 200-300 degree; kev ua tau zoo maj mam poob ntawm 300-400 degree; thiab lub zog poob tseem ceeb tshwm sim ntawm 400-500 degree, yuav tsum muaj kev txwv nruj. Hauv qab no yog ib qho yooj yim, kev txiav txim siab tawg.
Cov ntsiab lus tseem ceeb: Vim li cas qhov kub thiab txias cuam tshuam rau kev ruaj ntseg tshuab
S355K2W's mechanical zog (yield zog, tensile zog, toughness) cia siab rau ib tug zoo ferrite-pearlite grain qauv. Ntawm qhov kub siab, cov qauv no tau hloov maj mam hloov uas ua rau kev ua haujlwm tsis zoo:
Thermal activation tsis muaj zog lub zog sib txuas ntawm cov hlau atoms, txo lub zog thiab hardness.
Lub sij hawm ntev raug rau qhov kub siab ua rau cov nplej coarsening, txo qis toughness thiab creep kuj (lub peev xwm los tiv thaiv mus tas li deformation nyob rau hauv tas li load).
Ntawm 300-400 degree, qee cov hlau tau ntsib "xiav brittleness" - ib ntus toughness poob los ntawm oxygen diffusion raws cov ciam teb, ua rau muaj kev pheej hmoo ntawm nkig tawg nyob rau hauv dynamic loads.
Mechanical Stability los ntawm qhov kub thiab txias (200-500 degree)
S355K2W qhov kev ua tau zoo ntawm kev ruaj ntseg sib txawv ntawm 200-500℃ntau yam, nrog rau qhov tseeb meej rau kev pabcuam nyab xeeb. Cov ntaub ntawv hauv qab no yog raws li EN 10025-5 ntxiv cov kev ntsuas kub kub thiab kev ua haujlwm hauv kev lag luam:
1. 200-300 degree: Kev ruaj ntseg zoo, nyab xeeb rau lub sijhawm ntev - Kev Pabcuam Sijhawm
Hloov ua haujlwm: Yield zog thiab tensile zog txo los ntawm tsuas yog 5-10% piv rau chav tsev kub; -40℃cuam tshuam toughness tseem ntau dua lossis sib npaug rau 27J (ua tau raws li EN 10025-5 cov cai). Tsis muaj xiav brittleness tshwm sim nyob rau hauv no ntau yam.
Daim ntawv qhia kev: Haum rau ntev - kev pab cuam nyob rau hauv siab - qhov kub thiab txias ib puag ncig xws li cov pa hluav taws xob, qis- qhov kub thiab txias muaj qhov cub, los yog lub hnub ci thermal fais fab nroj tsuag. Tsis tas yuav muaj kev ntsuas ntxiv ntxiv.
2. 300-400℃: Kev poob qis zuj zus, Kev Pabcuam Tsis Muaj Cai
Hloov ua haujlwm: Yield zog txo los ntawm 15-25%, tensile zog los ntawm 10-18%; toughness yuav poob ib ntus (xiav brittleness) ntawm 350-400 degree, tab sis tseem tswj cov ductility yooj yim. Creep deformation yuav pom nyob rau hauv lub sij hawm ntev load.
Daim ntawv qhia kev: Tsuas yog tsim nyog rau luv luv- kev pabcuam sijhawm (tsawg dua lossis sib npaug li 1000 teev / xyoo) lossis qis dua -load scenarios (tsawg dua lossis sib npaug li 50% ntawm chav tsev-kub load-cov kabmob muaj peev xwm). Tsis txhob dynamic loads (piv txwv li, kev co, cuam tshuam) nyob rau hauv no kub ntau yam. Xav txog kev nce cov thickness ntawm cov khoom kom them rov qab rau lub zog poob.
3. 400-500℃: Kev poob qis, siab -Kev pheej hmoo
Hloov ua haujlwm: Yield zog poob los ntawm 30-45%, tensile zog los ntawm 20-30%; toughness poob qis heev (kev cuam tshuam lub zog yuav poob qis dua 27J); creep kuj deteriorates hnyav, ua rau mus tas li deformation txawm nyob rau hauv nruab nrab loads.
Daim ntawv qhia kev: Tsis pom zoo rau kev ua haujlwm ntev -. Yog tias tsis tuaj yeem zam tau (xws li kev kho thaum muaj xwm txheej ceev), kev txwv nruj (tsawg dua lossis sib npaug li 30% ntawm chav tsev- qhov muaj peev xwm kub) thiab kev tswj lub sijhawm ua haujlwm (tsawg dua lossis sib npaug li 500 teev / xyoo) yog qhov yuav tsum tau ua. Tom qab- kev pabcuam kev tshuaj xyuas yuav tsum tau ua kom pom kev deformation.
Yam tseem ceeb uas ua rau kev ua haujlwm tsis zoo
Tshaj li qhov kub thiab txias, ob yam tseem ceeb ua rau S355K2W qhov kev ua haujlwm tsis zoo ntawm 200-500℃- qhov tseem ceeb rau kev ntsuas kev pheej hmoo:
Lub Sijhawm Tshaj Tawm Ntev: Qhov ntev ntawm cov hlau raug rau qhov kub thiab txias, qhov hnyav hnyav coarsening thiab creep deformation ua. Piv txwv li, ntawm 400℃, 5000 teev ntawm kev kis tau tuaj yeem txo cov khoom muaj zog los ntawm qhov ntxiv 10% piv rau 1000 teev.
Atmospheric Corrosion: Kub kub ua ke nrog oxidizing los yog corrosive atmospheres (xws li, industrial fumes, ya raws) tsim ib tug xoob oxide txheej rau ntawm qhov chaw, ua kom cov grain puas thiab txo cov kev ua tau zoo.
Cov tswv yim siv tswv yim
Temperature Limit Txhais: Qhia meej meej qhov kev pabcuam kub siab tshaj plaws hauv kev tsim qauv - zam dhau 300℃rau ntev -lub sijhawm thauj khoom-cov kabmob.
Kev tiv thaiv: Rau 300-400℃kev pabcuam, siv siab-kub- tiv thaiv tiv thaiv- oxidation coatings (xws li, aluminium-chromium composite coatings) kom txo tau qhov corrosion thiab grain puas.
Kev hloov khoom siv rau siab -Tswj xwm kub: Yog tias qhov kev pabcuam ntev ntev ntawm 400-500℃yuav tsum tau, hloov S355K2W nrog cov cua sov{10}}cov hlau tsis muaj zog (piv txwv li, P91/P92 lossis 316L stainless hlau) uas tau tsim tshwj xeeb rau kev ruaj ntseg kub.
Kev tshuaj xyuas tsis tu ncua: Rau cov khoom siv hauv 300-400℃kev pabcuam, ua qhov kev sim txhua xyoo uas tsis muaj kev puas tsuaj (UT rau cov thickness poob, MPT rau cov kab nrib pleb) thiab cov cuab yeej cuab tam kuaj xyuas kev ua haujlwm tsis zoo.
Hauv cov ntsiab lus, S355K2W Corten Steel qhov kev ua haujlwm zoo ntawm 200-300℃tab sis maj mam poob ntawm 300-400℃thiab tseem ceeb ntawm 400-500℃. Tus yuam sij rau kev nyab xeeb daim ntawv thov nyob rau hauv high-temperature ib puag ncig yog nruj nreem kub thiab load tswj, nrog rau cov kev tiv thaiv tsim nyog. Rau qhov kub siab tshaj 300 degree, kev ntsuas tag nrho ntawm lub sijhawm ua haujlwm thiab kev thauj khoom yog tsim nyog; rau 400-500 degree, kev hloov khoom siv yog qhov kev daws teeb meem zoo tshaj plaws kom tsis txhob muaj kev pheej hmoo ntawm cov qauv.
