Tsis tshua muaj kub- thaj chaw kub (tsawg dua lossis sib npaug ntawm -40 degree), xws li thaj chaw polar lossis siab - thaj chaw siab alpine, ua rau muaj kev phom sij rau cov hlau: steel lub toughness plummets, ua rau nws yooj yim rau nkig tawg sai sai yam tsis muaj ceeb toom-txawm tias nyob rau hauv ib txwm muaj. Rau cov haujlwm xav txog S355K2W Corten Steel hauv cov cheeb tsam hnyav no, cov lus nug tseem ceeb tshwm sim: S355K2W puas tuaj yeem siv nyab xeeb hauv tsawg dua lossis sib npaug rau -40℃cheeb tsam, thiab yuav tsum muaj kev tiv thaiv ntxiv li cas? Cov lus teb meej, hauv paus hauv EN 10025-5 cov qauv thiab kev ua lag luam, yog qhov tseeb:Yog lawm, S355K2W tuaj yeem siv tsawg dua lossis sib npaug rau -40℃cheeb tsam, raws li nws -40℃cuam tshuam toughness (Ntau dua lossis sib npaug rau 27J) ua tau raws li EN 10025-5; Txawm li cas los xij, kev tiv thaiv ntxiv yog tsim nyog los txo cov kev pheej hmoo ntawm pob txha tawg thiab ua kom muaj kev nyab xeeb mus ntev. Hauv qab no yog ib qho yooj yim, ua tiav kev tawg.
Cov ntsiab lus tseem ceeb: Cov phom sij ntawm brittle Fracture tsawg dua lossis sib npaug li -40 degree
Ntawm qhov kub thiab txias tsawg dua los yog sib npaug rau -40 degree, cov qauv molecular ntawm cov hlau tau hloov pauv loj, ua rau muaj kev poob qis hauv ductility thiab toughness -qhov no yog qhov tseem ceeb ntawm cov kev pabcuam kub kub:
Hlau hloov los ntawm "tawv" (tuaj yeem deform ua ntej tawg) mus rau "nkim" (fracturing dheev nrog tsawg deformation). Txawm tias me me tsis xws luag (piv txwv li, vuam flaws, kev ntxhov siab ntau) tuaj yeem ua rau tawg sai sai, ua rau muaj kev puas tsuaj loj heev.
Rau Corten Steel zoo li S355K2W, thaum nws cov huab cua tsis kam yog qhov zoo heev, qhov kub tsis tshua muaj siab ntawm nws tus kheej ua rau muaj kev nyab xeeb ntawm cov qauv- yuav tsum tau ntsuas ntsuas tshaj qhov kev tiv thaiv corrosion.
Yog vim li cas S355K2W thiaj haum rau tsawg dua los yog sib npaug rau -40℃Regions: Standard Basis
S355K2W qhov tsim nyog rau Tsawg dua lossis sib npaug rau -40℃kev pabcuam nyob hauv "K2" cov lus nyob rau hauv nws lub npe qib, uas tau hais meej meej los ntawm EN 10025-5 (Tebchaws Europe tus qauv rau huab cua-resistant steel qauv):
-40℃Impact Toughness yuav tsum tau: Qib "K2" tswj hwm qhov tsawg kawg nkaus Charpy V-qhov cuam tshuam lub zog ntawm Ntau dua lossis sib npaug rau 27J ntawm -40℃. Qhov no ua kom S355K2W khaws cov toughness txaus los tiv thaiv cov pob txha tawg ntawm lub hom phiaj tsis tshua muaj kub-qhov no yog lub hauv paus rau nws qhov kev siv tau.
Los ntawm qhov sib txawv, lwm yam S355-series Corten Steels (xws li, S355J2W rau -20 degree, S355J0W rau 0 degree) tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua kom muaj zog tsawg dua lossis sib npaug rau -40 degree, ua rau lawv tsis haum rau cov cheeb tsam zoo li no.
Kev Tiv Thaiv Ntxiv Ntxiv rau Tsawg dua lossis sib npaug rau -40℃Kev Pabcuam
Thaum S355K2W ua tau raws li theem pib qis- tus qauv ntsuas qhov kub thiab txias, kev ntsuas ntxiv yog tsim nyog los tshem tawm cov kev pheej hmoo tsawg dua lossis sib npaug rau -40℃cheeb tsam. Cov kev ntsuas no tsom rau kev txo qis kev ntxhov siab, ua kom zoo dua vuam zoo, thiab txhim kho cov qauv kev ruaj ntseg:
1. Kev tsim kho kom zoo: Tsis txhob muaj kev ntxhov siab
Siv cov kev hloov pauv, sib npaug (fillet vojvoog ntau dua lossis sib npaug li 3 × phaj thickness) rau txhua yam khoom siv, tsis txhob muaj cov npoo ntse thiab cov hlaws nrawm nrawm - ntu hloov pauv- cov no yog cov ntsiab lus kev ntxhov siab uas yooj yim ua rau tawg ntawm qhov kub thiab txias.
Txo kev siv nyias - daim phiaj ntsuas (<10mm) in wind-exposed areas; thicken critical load-bearing components appropriately to improve structural rigidity and toughness reserve.
Siv qhov kev nyab xeeb siab dua (Ntau dua lossis sib npaug rau 1.6 rau cov khoom siv zoo li qub, Ntau dua lossis sib npaug li 2.2 rau cov khoom hnyav) dua li qhov kub thiab txias ib puag ncig los cuam tshuam qhov kev pheej hmoo ntawm toughness degradation.
2. Kev Tswjhwm nruj nruj
Siv qis-hydrogen, qis-kub- cov khoom siv welding resistant (xws li, ER70S-GNiCu rau MIG, E7018-GNiCu rau SMAW) uas phim S355K2W's -40℃toughness yuav tsum tau.
Preheat lub hauv paus hlau rau 140-180℃(siab dua li tus qauv 120-150℃rau cov phaj tuab) kom nrawm hydrogen diffusion thiab txo cov thermal stress. Khaws qhov kub ntawm preheating thaum lub sij hawm tag nrho cov txheej txheem vuam.
Tswj cov khoom siv hluav taws xob nruj me ntsis (20-30 kJ/cm) kom txo qhov loj ntawm tshav kub- thaj chaw cuam tshuam (HAZ) thiab zam cov nplej coarsening, uas degrades toughness. Ua tom qab-weld kev ntxhov siab nyem annealing ntawm 550-600℃rau cov pob qij txha tseem ceeb.
3. Kev tiv thaiv nto & tiv thaiv - Kev ntsuas dej khov
Siv qhov qis- kub- tiv thaiv tiv thaiv - xeb txheej txheej txheej txheej (xws li, epoxy zinc- nplua nuj primer + polyurethane topcoat) los tiv thaiv ntsev, dej khov, thiab daus los ntawm adhering rau saum npoo- corrosion ua ke nrog qhov kub thiab txias yuav ua rau kom muaj zog ntxiv.
Nruab cov khoom siv tiv thaiv-icing (piv txwv li, cua sov cables) rau cov khoom siv sab nraum zoov uas ua rau cov dej khov khov (piv txwv li, choj decks, txhawb nqa) kom tsis txhob muaj kev ntxhov siab ntxiv los ntawm kev nthuav dav dej khov.
4. Kev tshuaj xyuas tsis tu ncua & Kev tu
Ua tsis tu ncua tsis tu ncua -kev kuaj kev puas tsuaj (NDT) siv cov khoom sib nqus (MPT) thiab kuaj ultrasonic (UT) txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau nws, ua rau cov txiav, cov txiav
Tshem cov dej khov thiab cov daus sai sai tom qab daus poob kom tsis txhob muaj qhov sib npaug ntawm cov khoom thauj thiab kev ntxhov siab ntxiv los ntawm qhov kub thiab txias qhov sib txawv ntawm cov dej khov thiab tsis yog -cov dej khov.
Hauv cov ntsiab lus, S355K2W Corten Steel tuaj yeem siv nyab xeeb tsawg dua lossis sib npaug rau -40℃qis heev- thaj chaw kub vim nws EN 10025-5- ua raws -40℃cuam tshuam toughness. Lub ntsiab tseem ceeb ntawm kev ua kom muaj kev nyab xeeb mus ntev yog nyob rau hauv kev siv cov kev tiv thaiv ntxiv: kev txhim kho kev tsim kom zoo kom tsis txhob muaj kev ntxhov siab, kev tswj kev vuam nruj, txhim kho kev tiv thaiv saum npoo, thiab ua haujlwm tsis tu ncua. Cov kev ntsuas no ntxiv rau cov hlau qhov kev ua tau zoo ntawm qhov kub thiab txias, zoo txo qhov kev pheej hmoo ntawm pob txha tawg hauv qhov hnyav hnyav hnyav.
