Cov kav hlau me me, tseem hu ua low -carbon steel kav, xa mus rau cov kav dej ua los ntawm cov pa roj carbon tsawg, uas nws cov ntsiab lus carbon feem ntau tsawg dua lossis sib npaug li 0.25%, thiab muaj qee qhov me me ntawm manganese, silicon, phosphorus, sulfur thiab lwm yam khoom. Vim nws cov ntsiab lus tsis tshua muaj carbon, cov yeeb nkab steel hom no muaj cov yas zoo, weldability thiab processability, thiab yog tus nqi qis. Nws yog dav siv nyob rau hauv kev tsim kho, machinery, zog, tsheb thauj mus los thiab lwm yam teb.
Dab tsi yog qhov kev pab cuam lub neej ntawm cov kav hlau me me?
Kev pabcuam lub neej ntawm cov kav dej me me yog cuam tshuam los ntawm ntau yam, thiab feem ntau tuaj yeem raug ntsuas los ntawm cov hauv qab no:
Cov yam tseem ceeb cuam tshuam:
1. Ib puag ncig tej yam kev mob
Qhuav ib puag ncig sab hauv: Lub neej kev pabcuam tuaj yeem ncav cuag ntau tshaj 50 xyoo (xws li cov kav dej hauv tsev).
Qhov chaw ntub dej los yog sab nraum zoov: Nws yuav luv luv rau 20-30 xyoo. Yog tias raug los nag, tshuaj tsuag ntsev (cov cheeb tsam ntug dej hiav txwv) los yog muaj kuab paug, tus nqi corrosion yuav nrawm.
Cov kav dej faus: Nyob ntawm qhov corrosiveness ntawm cov av (xws li pH, resistivity), lub neej kev pab cuam feem ntau yog 15-50 xyoo, thiab yuav tsum tau tiv thaiv corrosion txheej los yog cathodic tiv thaiv.
2. Kev tiv thaiv- kev ntsuas corrosion
Cov kav hlau tsis muaj kev tiv thaiv tsuas yog kav li 5-15 xyoo hauv qhov chaw hnyav. Galvanizing, epoxy txheej los yog3PE tiv thaiv -corrosiontuaj yeem txuas lub neej ua haujlwm rau 30-50 xyoo lossis ntev dua.
3. Siv kev ntxhov siab
Ntev -lub sij hawm raug rau cov loads siab lossis qaug zog (xws li cov kua dej hloov pauv) tuaj yeem ua rau hlau qaug zog thiab ua rau lub neej ua haujlwm luv.
4. Media tiv tauj
Kev thauj mus los ntawm corrosive media (acids, alkalis, seawater) yuav xav tau cov hlau tsis muaj steel lossis yas hauv ob sab phlu, txwv tsis pub lub neej kev pabcuam yuav raug txo kom tsawg. Daim ntawv thov scenario hais txog: Lub tsev qauv (xws li scaffolding): Galvanized low- carbon steel kav yuav kav ntev tshaj 30 xyoo nyob rau hauv ib txwm huab cua. Galvanized qis- cov kav dej carbon steel sib xyaw ua ke muaj zog thiab tiv thaiv xeb, thiab tus nqi qis dua li aluminium alloy. Cov kav dej / roj av: Kev tsim lub neej ntawm cov kav hlau faus nrog tiv thaiv - kev kho corrosion feem ntau yog 30-50 xyoo. Cov kav dej muaj: Kub kub lossis corrosive ib puag ncig yuav tsum tau hloov tsis tu ncua (10-20 xyoo). Tsheb chassis qhov chaw: Siv nws cov stamping formability los tsim cov khoom uas tsis yog-load-bearing.
Tshuaj muaj pes tsawg leeg thiab kev faib tawm ntawm cov pa roj carbon tsawg cov kav dej:
Cov pa roj carbon (C): Tsawg dua lossis sib npaug li 0.25% Kev Ua Haujlwm: cuam tshuam rau lub zog thiab hardness, qis carbon steel muaj zoo toughness tab sis tsis muaj zog
Manganese (Mn): 0.30% ~ 0.60% Muaj nuj nqi: Txhim kho lub zog thiab hardenability
Silicon (Si): Tsawg dua lossis sib npaug li 0.30% Kev Ua Haujlwm: Txhim kho lub zog thiab oxidation tsis kam
Phosphorus (P) Tsawg dua lossis sib npaug rau 0.045% Kev Ua Haujlwm: Txhim kho lub zog tab sis ua kom txias brittleness
Sulfur (S) Tsawg dua los yog sib npaug rau 0.045% Kev Ua Haujlwm: Txo cov weldability thiab yooj yim ua rau kub brittleness
Kev faib ua feem:
Los ntawm kev tsim khoom:
Welded steel yeeb nkab (xws liERW high zaus welded yeeb nkab, submerged arc welded yeeb nkab) - tus nqi qis, tsim nyog rau kev thauj mus los tsis tshua muaj siab.
Seamless steel yeeb nkab(kub dov los yog txias kos) - siab zog, siv rau kev kub siab, precision mechanical lug
Los ntawm kev siv:
Cov yeeb nkab steel hlau (xws li scaffolding, kev txhawb nqa lub tsev)
Cov kav dej thauj khoom (xws li dej, roj, kav dej)
Tubes rau kev siv tshuab (xws li qhov chaw pib, kev ua liaj ua teb machinery accessories)
Qhov zoo thiab qhov tsis zoo ntawm cov pa roj carbon tsawg cov kav dej:
(1) Qhov zoo
Tus nqi qis: Cov txheej txheem smelting ntawm qis - carbon steel yog cov paub tab, cov khoom siv hlau ore muaj ntau, cov txheej txheem tsim khoom yog yooj yim, thiab tus nqi qis dua cov hlau tsis muaj steel lossis hlau alloy steel kav.
Cov txheej txheem yooj yim: Zoo ductility, haum rau stamping, dabtsi yog khoov, txiav, vuam (xws li lub tsev steel qauv), txo cov nqi tsim khoom thiab kev tsim kho.
Kev ua haujlwm vuam zoo heev: Tsawg- carbon steel tsis yooj yim los tsim vuam tawg thiab tsim rau ntau txoj kev vuam (arc vuam, roj vuam, thiab lwm yam).
Kev ua tau zoo tus nqi: Hauv qhov tsis yog - ib puag ncig hnyav, qhov kev ua tau zoo txaus los ua kom tau raws li cov kev xav tau feem ntau thiab tsim nyog rau cov ntawv thov loj - (xws li scaffolding, cov kav dej zoo tib yam).
Recyclable thiab environmentally friendly: 100% recyclable, nyob rau hauv txoj kab nrog tus qauv ntawm ntsuab manufacturing.
(2) Qhov tsis zoo
Lub zog qis: Lub zog tensile (300-}500 MPa) tsis zoo li nruab nrab-siab carbon steel lossis hlau alloy.
Tsis zoo corrosion kuj: yooj yim rau xeb, xav tau galvanizing, pleev xim los yog yas txheej thiab lwm yam los tiv thaiv- kho corrosion.
Poor high temperature performance: easy to oxidize at high temperature (>300 degree) rau lub sijhawm ntev, thiab lub zog txo qis.
